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EP1282771B1 - Method for the operation of a fuel metering system on a direct injection internal combustion engine - Google Patents

Method for the operation of a fuel metering system on a direct injection internal combustion engine Download PDF

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Publication number
EP1282771B1
EP1282771B1 EP01947132A EP01947132A EP1282771B1 EP 1282771 B1 EP1282771 B1 EP 1282771B1 EP 01947132 A EP01947132 A EP 01947132A EP 01947132 A EP01947132 A EP 01947132A EP 1282771 B1 EP1282771 B1 EP 1282771B1
Authority
EP
European Patent Office
Prior art keywords
fuel
high pressure
internal combustion
metering system
combustion engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01947132A
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German (de)
French (fr)
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EP1282771A1 (en
Inventor
Ulrich Steinbrenner
Klaus Joos
Thomas Frenz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Publication date
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Publication of EP1282771A1 publication Critical patent/EP1282771A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0275—Arrangement of common rails
    • F02M63/0285—Arrangement of common rails having more than one common rail
    • F02M63/0295—Arrangement of common rails having more than one common rail for V- or star- or boxer-engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the present invention relates to a method of operating a fuel metering system of a direct injection internal combustion engine having a fuel reservoir, at least one prefeed pump for delivering fuel from the fuel reservoir into a low pressure region of the fuel metering system, a high pressure pump assembly having at least two high pressure pumps for delivering fuel from the low pressure region into at least one High-pressure accumulator, a control unit for controlling an existing in the high-pressure accumulator injection pressure and with fuel injection valves for injecting fuel from the high-pressure accumulator in the combustion chambers of the internal combustion engine.
  • the invention also relates to a fuel metering system of a direct injection internal combustion engine having a fuel reservoir, at least one prefeed pump for delivering fuel from the fuel reservoir to a low pressure region of the fuel metering system, a high pressure pump assembly having at least two high pressure pumps for delivering fuel from the low pressure region to at least one high pressure accumulator, a controller for controlling an injection pressure prevailing in the high-pressure accumulator and with fuel injection valves for injecting fuel from the high-pressure accumulator into Combustion chambers of the internal combustion engine.
  • the present invention relates to a direct injection internal combustion engine having a fuel metering system comprising a fuel reservoir, at least one prefeed pump for delivering fuel from the fuel reservoir into a low pressure region of the fuel metering system, a high pressure pump assembly having at least two high pressure pumps for delivering fuel from the low pressure region into at least one high pressure accumulator , a control device for controlling a pressure prevailing in the high-pressure accumulator injection pressure and fuel injection valves for injecting fuel from the high-pressure accumulator into combustion chambers of the internal combustion engine comprises.
  • the invention also relates to a control device for such a direct-injection internal combustion engine.
  • Direct injection internal combustion engine of the type mentioned above with fuel metering systems mentioned above are known from the prior art, for example.
  • the fuel metering system has a prefeed pump, which is usually designed as an electric fuel pump and conveys fuel from a fuel reservoir into a low-pressure region of the fuel metering system.
  • a high-pressure pump arrangement of the fuel metering system delivers fuel from the low-pressure region at high pressure into a high-pressure accumulator.
  • the high-pressure accumulator is, for example, designed as the distributor strip of a common-rail (CR) fuel metering system. From the high-pressure accumulator discharge injection valves, can be injected via the fuel from the high-pressure accumulator in the combustion chambers of the internal combustion engine.
  • the injection valves are controlled by a control unit of the internal combustion engine.
  • the control unit furthermore has the task of regulating a pressure in the high-pressure accumulator via a pressure control loop.
  • An increase in the injection pressure can be achieved by suitably activating the high-pressure pump arrangement, that is, by increasing the fuel supply into the high-pressure accumulator.
  • a reduction of the injection pressure can be achieved by suitable control of a branching off from the high-pressure accumulator control valve, ie by increasing the fuel flow from the high-pressure accumulator, or by reducing the capacity of the HDP.
  • the control valve is designed, for example, as a quantity control valve (in the case of 1-cylinder piston high-pressure pumps) or as a pressure control valve (in the case of 3-cylinder radial piston high-pressure pumps).
  • the high-pressure pump assembly usually only one high-pressure pump. This may, for example, be designed as a 1-cylinder piston pump or as a 3-cylinder radial piston pump. With a high-pressure pump can be ensured in internal combustion engines with four or fewer cylinders or in internal combustion engines with a relatively small displacement in all operating conditions of the internal combustion engine, a reliable supply of the combustion chambers with the required amount of fuel.
  • a common rail (CR) fuel metering system of the type described in the introduction with a prefeed pump and a high-pressure pump is known.
  • a high-pressure pump for a fuel metering system is known.
  • the described high-pressure pump can be designed as a radial piston pump with three star-shaped pump pistons or as an axial piston pump with two pump pistons arranged parallel to one another.
  • the individual pistons are actuated via a common cam or eccentric drive. Between the individual pump piston so there is a fixed mechanical coupling, which does not allow targeted operation of individual pump piston.
  • the known high-pressure pump has a plurality of pump pistons, it nevertheless has to be regarded as a single high-pressure pump.
  • DE 40 41 800 C2 discloses a two-piston pump designed as an axial piston pump of an anti-lock braking system with two pump pistons arranged parallel to one another.
  • EP 0 448 836 A1 discloses a reciprocating piston pump designed as a radial piston pump with two diametrically opposed pump pistons of a vehicle brake system for conveying fluid.
  • DE 40 27 794 A1 a radial piston pump for the power supply in the vehicle hydraulics (anti-lock braking system ABS, traction control ASR, active suspension control) known. All these pump arrangements have in common that there is a fixed mechanical coupling between the individual pump pistons and targeted operation of individual pump pistons is not possible, so that all these pump arrangements are to be regarded as individual pumps.
  • the fuel metering system comprises two high-pressure pumps that deliver fuel from a low-pressure region into two high-pressure reservoirs.
  • the two high-pressure accumulator are connected via a pressure equalization line, in which a control valve is arranged, with each other.
  • a separate pressure sensor is provided to detect the pressure prevailing in the high pressure accumulator.
  • the pressures generated by the high pressure pumps in the high pressure accumulators may be different, and that in case of too high a pressure difference between the two high pressure accumulators, a fuel supply path is switched off by deactivating the corresponding high pressure pump. This shows that in the known fuel metering system the two High-pressure pumps are not controlled by a common pressure control circuit and with individual control times.
  • the present invention is based on the object to ensure a reliable fuel supply in a structurally simple and most cost-effective manner, especially in internal combustion engines with four or more cylinders or in internal combustion engines with a large displacement.
  • the invention proposes, starting from the method of the type mentioned above, that all high-pressure pumps are controlled via a common pressure control circuit independently of each other with the same drive time.
  • the fuel metering system is thus not divided into several fuel circuits, but only a fuel circuit for metering fuel is provided in all combustion chambers of the internal combustion engine. All high-pressure pumps of the high-pressure pump arrangement are arranged in this fuel circuit.
  • the fuel metering system according to the invention preferably has two high-pressure pumps.
  • the high-pressure pumps used can be designed as standard pumps, for example as 1-cylinder piston pumps or as 3-cylinder radial piston pumps, as they are known per se from the prior art.
  • the control unit of the fuel metering system controls all high-pressure pumps independently of each other via a common pressure control loop. In the fuel circuit only a high-pressure accumulator is arranged, the injection pressure can be controlled by only one pressure control loop. As a result, the inventive method can be particularly simple and cost-effective manner can be realized.
  • the high-pressure pumps are driven with the same activation time.
  • the activation time is thus calculated in the control unit only once for all high-pressure pumps of the fuel metering system.
  • the control of the individual high-pressure pumps then takes place via a switching device which switches over at the corresponding times or at the corresponding angular position of the crankshaft of the internal combustion engine between the first high-pressure pumps and the second high-pressure pumps. In this way, the first high-pressure pumps and the second high-pressure pumps can be activated alternately with the same activation time.
  • the high-pressure pumps are actuated parallel to one another.
  • the high-pressure pumps are thus controlled synchronously and simultaneously pass through a suction stroke and a delivery stroke.
  • one or more first high-pressure pumps be controlled in opposition to one or more second high-pressure pumps.
  • the first high-pressure pumps and the second high-pressure pumps pass through the suction stroke and the delivery stroke offset from each other, i. when the first high-pressure pumps are in the suction stroke, the second high-pressure pumps are in the delivery stroke and vice versa, when the first high-pressure pumps are in the delivery stroke, the second high-pressure pumps are in the suction stroke.
  • control unit comprises a pressure control loop for all high-pressure pumps and controls the high-pressure pumps independently with the same drive time.
  • the high-pressure pump arrangement has two high-pressure pumps.
  • control unit controls the high-pressure pumps in parallel with one another.
  • control unit controls one or more first high pressure pumps opposite to one or more second high pressure pumps.
  • the internal combustion engine has at least six cylinders.
  • the fuel metering system has two high-pressure storage areas, which communicate with each other via a pressure equalization line. By the pressure equalization line the two high-pressure storage areas are combined to form a common high-pressure accumulator.
  • control element which is provided for a control device of a direct injection internal combustion engine.
  • a program is stored on the control, which is executable on a computing device, in particular on a microprocessor, and suitable for carrying out the method according to the invention.
  • the invention is realized by a program stored on the control program, so that this provided with the program control in the same way is the invention as the method to whose execution the program is suitable.
  • an electrical storage medium can be used as the control, for example a read-only memory or a flash memory.
  • control device comprises a control according to claim 11.
  • FIG. 1 shows a direct-injection internal combustion engine 1 of a motor vehicle is shown, in which a piston 2 in a cylinder 3 back and forth.
  • the cylinder 3 is provided with a combustion chamber 4, which inter alia by the piston 2, an inlet valve 5 and an outlet valve. 6 is limited.
  • an intake valve 5 and the exhaust valve 6 an exhaust pipe 8 is coupled.
  • an injection valve 9 and a spark plug 10 protrude into the combustion chamber 4. Via the injection valve 9, fuel can be injected into the combustion chamber 4. With the spark plug 10, the fuel in the combustion chamber 4 can be ignited.
  • the piston 2 is set by the combustion of the fuel in the combustion chamber 4 in a reciprocating motion, which is transmitted to a crankshaft, not shown, and exerts on this torque.
  • the internal combustion engine 1 has a fuel metering system 11, by which the fuel to be injected via the injection valve 9 into the combustion chamber 4 is metered.
  • the fuel metering system 11 has a fuel reservoir 12 from which fuel is conveyed into a low-pressure region ND of the fuel metering system 11 by a prefeed pump 13 designed as an electric fuel pump.
  • a high-pressure pump arrangement consisting of two high-pressure pumps 14 and 15 delivers fuel from the low-pressure area ND into a high-pressure accumulator 16.
  • the high-pressure pumps 14, 15 are designed as single-cylinder high-pressure pumps with two non-return valves 17 and one quantity control valve 18. Through the quantity control valves 18, a quantity control line 19 can be opened or closed.
  • the high pressure pumps 14, 15 may be formed as three-cylinder radial piston. It is crucial that Standard high-pressure pumps and no costly and expensive custom-made as high-pressure pumps 14, 15 are used.
  • the high pressure accumulator 16 is formed as a storage bar of a common rail (CR) fuel metering system.
  • a pressure sensor is arranged, which detects the pressure prevailing in the high-pressure accumulator 16 injection pressure and generates a corresponding output signal p_r.
  • the injection valves 9 are actuated with a corresponding drive signal ES.
  • the spark plug 10 is driven by a drive signal ZW.
  • a low-pressure regulator 20 is arranged in the low-pressure region ND, via which fuel from the low-pressure region ND can flow back into the fuel reservoir 12, if the pressure in the low-pressure region ND exceeds specified pressure value.
  • a filter 21 is arranged between the prefeed pump 13 and the high pressure pumps 14, 15.
  • a control unit 22 is acted upon by input signals 23, which represent operating variables of the internal combustion engine 1 measured by means of sensors.
  • the control unit 22 with an air mass sensor, a lambda sensor, a speed sensor or in the high pressure area HD, preferably in the high-pressure accumulator 16, arranged pressure sensor 24 and the like. connected.
  • the control unit 22 generates output signals 25, with which over Actuators or enjoyr the behavior of the internal combustion engine 1 can be influenced.
  • the control unit 22 with the injection valve 9 (control signal ES), the spark plug 10 (control signal ZW), the quantity control valves 18 (control signal T), arranged in the intake manifold 7 throttle valve and the like. connected and generates the signals required for their control.
  • control unit 22 is provided to control the operating variables of the internal combustion engine 1 and / or to regulate.
  • the fuel mass injected by the injection valve 9 into the combustion chamber 4 is controlled and / or regulated by the control unit 22, in particular with regard to low fuel consumption and / or low pollutant emission.
  • the control unit 22 is provided with a microprocessor which has stored in a control, in particular in a read-only memory or a flash memory, a program which is adapted to perform said control and / or regulation.
  • a program is stored in the control which is suitable for carrying out the method according to the invention.
  • the internal combustion engine 1 of Figure 1 can be operated in a variety of modes. Thus, it is possible, the internal combustion engine 1 in a homogeneous operation, a shift operation, a homogeneous lean operation and the like. to operate. It is possible to switch over between the aforementioned operating modes of the internal combustion engine. Such switching is performed by the controller 22.
  • the fuel metering system 11 illustrated in FIG. 1 is characterized in particular in that it has only one fuel circuit for metering fuel into all combustion chambers 4 of the internal combustion engine 1.
  • both high-pressure pumps 14, 15 are arranged. Both high-pressure pumps 14, 15 are actuated independently of one another by the control unit 22 via a common pressure control loop. For resource-conserving operation of the fuel metering system 11, both high-pressure pumps 14, 15 are actuated with the same drive time T. The activation time T is therefore calculated only once for both high-pressure pumps 14, 15 in the control unit 22.
  • FIG. 1 shows the fuel metering system 11 according to the invention for an internal combustion engine 1 with four cylinders 3.
  • the fuel metering system 11 according to the invention ensures reliable fuel supply to the combustion chambers 4, even of internal combustion engines 1 with more than four cylinders 3 and / or a large displacement.
  • FIG. 2 shows an inventive fuel metering system 11 using the example of an 8-cylinder internal combustion engine 1.
  • the high-pressure accumulator 16 comprises a left bank 16 'and a right bank 16 "The two banks 16', 16" communicate with one another via a pressure equalization line 26, so that in both banks 16 ', 16 "the same injection pressure prevails and the banks 16 ', 16" can be considered as a common high-pressure accumulator 16.
  • From each bank 16 ', 16 "branch off four injection valves 9, via which fuel can be injected into the combustion chambers 4 of the internal combustion engine 1.
  • Each bank 16', 16" is driven by its own high-pressure pump 14; 15 supplied with fuel from the low pressure region ND.
  • Each high-pressure pump 14; 15 is a separate output stage 27; 28 assigned.
  • the control unit 22 determines the drive time T only once for both high-pressure pumps 14, 15.
  • the switch 29 is after a synchro-grid for the 8-cylinder internal combustion engine 1 every 180 ° the crankshaft KW switched.
  • the synchro-grid is based on the adjustable camshaft derived accordingly.
  • the fuel circuits can not be arranged according to the mechanical arrangement (left bank 16 ', right bank 16' ') because the firing order or injection sequence is not symmetrical, i. it does not jump alternately from the left bank 16 'to the right bank 16' '.
  • the fuel metering system according to the invention provides a remedy.
  • FIG. 3 shows a control of the high-pressure pumps 14, 15 of the fuel metering system 1 from FIG. 2 in accordance with a preferred embodiment.
  • the stroke h_1 of the high pressure pump 14 and in the lower part of the stroke h_2 of the high pressure pump 15 is shown. It can be clearly seen that the two high pressure pumps 14, 15 are actuated opposite to each other.
  • FIG. 3 shows when the pump pistons of the high-pressure pumps 14, 15 perform a suction stroke or when they convey fuel into the high-pressure reservoir 16 in a delivery stroke.
  • FIG. 4 shows a fuel metering system according to the invention 11 for an internal combustion engine with six cylinders 3 shown in detail.
  • fuel is also conveyed from the low-pressure region ND of the fuel metering system 11 into the high-pressure accumulator 16 by two high-pressure pumps 14, 15.
  • the fuel metering system 11 shown in FIG. 4 also has only one fuel circuit for metering fuel into all combustion chambers 4 of the internal combustion engine 1. Both high-pressure pumps 14, 15 are arranged in this one fuel circuit. Both high-pressure pumps 14, 15 are controlled independently of one another via a common pressure control loop (cf., FIG. 2).
  • FIGS. 5 and 6 show two different possibilities for driving the high-pressure pumps 14, 15 of the fuel metering system 11 from FIG. 4.
  • the high pressure pumps 14, 15 are driven in parallel.
  • the high-pressure pumps 14, 15 are actuated in opposite directions, as in the exemplary embodiment of FIG. 3.
  • suction stroke and delivery stroke are shown in Figures 5 and 6 suction stroke and delivery stroke.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Betreiben eines Kraftstoffzumesssystems einer direkteinspritzenden Brennkraftmaschine, mit einem Kraftstoffvorratsbehälter, mindestens einer Vorförderpumpe zum Fördern von Kraftstoff aus dem Kraftstoffvorratsbehälter in einen Niederdruckbereich des Kraftstoffzumesssystems, einer Hochdruckpumpenanordnung mit mindestens zwei Hochdruckpumpen zum Fördern von Kraftstoff aus dem Niederdruckbereich in mindestens einen Hochdruckspeicher, einem Steuergerät zur Regelung eines in dem Hochdruckspeicher herrschenden Einspritzdrucks und mit Kraftstoffeinspritzventilen zum Einspritzen von Kraftstoff aus dem Hochdruckspeicher in Brennräume der Brennkraftmaschine.The present invention relates to a method of operating a fuel metering system of a direct injection internal combustion engine having a fuel reservoir, at least one prefeed pump for delivering fuel from the fuel reservoir into a low pressure region of the fuel metering system, a high pressure pump assembly having at least two high pressure pumps for delivering fuel from the low pressure region into at least one High-pressure accumulator, a control unit for controlling an existing in the high-pressure accumulator injection pressure and with fuel injection valves for injecting fuel from the high-pressure accumulator in the combustion chambers of the internal combustion engine.

Die Erfindung betrifft außerdem ein Kraftstoffzumesssystem einer direkteinspritzenden Brennkraftmaschine, mit einem Kraftstoffvorratsbehälter, mindestens einer Vorförderpumpe zum Fördern von Kraftstoff aus dem Kraftstoffvorratsbehälter in einen Niederdruckbereich des Kraftstoffzumesssystems, einer Hochdruckpumpenanordnung mit mindestens zwei Hochdruckpumpen zum Fördern von Kraftstoff aus dem Niederdruckbereich in mindestens einen Hochdruckspeicher, einem Steuergerät zur Regelung eines in dem Hochdruckspeicher herrschenden Einspritzdrucks und mit Kraftstoffeinspritzventilen zum Einspritzen von Kraftstoff aus dem Hochdruckspeicher in Brennräume der Brennkraftmaschine.The invention also relates to a fuel metering system of a direct injection internal combustion engine having a fuel reservoir, at least one prefeed pump for delivering fuel from the fuel reservoir to a low pressure region of the fuel metering system, a high pressure pump assembly having at least two high pressure pumps for delivering fuel from the low pressure region to at least one high pressure accumulator, a controller for controlling an injection pressure prevailing in the high-pressure accumulator and with fuel injection valves for injecting fuel from the high-pressure accumulator into Combustion chambers of the internal combustion engine.

Des Weiteren betrifft die vorliegende Erfindung eine direkteinspritzende Brennkraftmaschine mit einem Kraftstoffzumesssystem, das einen Kraftstoffvorratsbehälter, mindestens eine Vorförderpumpe zum Fördern von Kraftstoff aus dem Kraftstoffvorratsbehälter in einen Niederdruckbereich des Kraftstoffzumesssystems, eine Hochdruckpumpenanordnung mit mindestens zwei Hochdruckpumpen zum Fördern von Kraftstoff aus dem Niederdruckbereich in mindestens einen Hochdruckspeicher, ein Steuergerät zur Regelung eines in dem Hochdruckspeicher herrschenden Einspritzdrucks und Kraftstoffeinspritzventile zum Einspritzen von Kraftstoff aus dem Hochdruckspeicher in Brennräume der Brennkraftmaschine umfasst.Furthermore, the present invention relates to a direct injection internal combustion engine having a fuel metering system comprising a fuel reservoir, at least one prefeed pump for delivering fuel from the fuel reservoir into a low pressure region of the fuel metering system, a high pressure pump assembly having at least two high pressure pumps for delivering fuel from the low pressure region into at least one high pressure accumulator , a control device for controlling a pressure prevailing in the high-pressure accumulator injection pressure and fuel injection valves for injecting fuel from the high-pressure accumulator into combustion chambers of the internal combustion engine comprises.

Die Erfindung betrifft schließlich auch ein Steuergerät für eine solche direkteinspritzende Brennkraftmaschine.Finally, the invention also relates to a control device for such a direct-injection internal combustion engine.

Stand der TechnikState of the art

Direkteinspritzende Brennkraftmaschine der eingangs genannten Art mit eingangs erwähnten Kraftstoffzumesssystemen sind aus dem Stand der Technik bspw. in Form von Brennkraftmaschinen mit Benzin-Direkteinspritzung (BDE) bekannt. Das Kraftstoffzumesssystem weist eine üblicherweise als Elektrokraftstoffpumpe ausgebildete Vorförderpumpe auf, die Kraftstoff aus einem Kraftstoffvorratsbehälter in einen Niederdruckbereich des Kraftstoffzumesssystems fördert. Eine Hochdruckpumpenanordnung des Kraftstoffzumesssystems fördert Kraftstoff aus dem Niederdruckbereich mit Hochdruck in einen Hochdruckspeicher. Der Hochdruckspeicher ist bspw. als die Verteilerleiste eines Common-Rail (CR)-Kraftstoffzumesssystems ausgebildet. Von dem Hochdruckspeicher münden Einspritzventile ab, über die Kraftstoff aus dem Hochdruckspeicher in Brennräume der Brennkraftmaschine eingespritzt werden kann.Direct injection internal combustion engine of the type mentioned above with fuel metering systems mentioned above are known from the prior art, for example. In the form of internal combustion engines with gasoline direct injection (BDE). The fuel metering system has a prefeed pump, which is usually designed as an electric fuel pump and conveys fuel from a fuel reservoir into a low-pressure region of the fuel metering system. A high-pressure pump arrangement of the fuel metering system delivers fuel from the low-pressure region at high pressure into a high-pressure accumulator. The high-pressure accumulator is, for example, designed as the distributor strip of a common-rail (CR) fuel metering system. From the high-pressure accumulator discharge injection valves, can be injected via the fuel from the high-pressure accumulator in the combustion chambers of the internal combustion engine.

Die Einspritzventile werden von einem Steuergerät der Brennkraftmaschine angesteuert. Das Steuergerät hat des Weiteren die Aufgabe über einen Druckregelkreis einen in dem Hochdruckspeicher herrschenden Einspritzdruck zu regeln. Eine Erhöhung des Einspritzdrucks kann durch geeignetes Ansteuern der Hochdruckpumpenanordnung, also durch Erhöhung der Kraftstoffzufuhr in den Hochdruckspeicher, erzielt werden. Eine Reduzierung des Einspritzdrucks kann durch geeignetes Ansteuern eines aus dem Hochdruckspeicher abzweigenden Steuerventils, also durch Erhöhung des Kraftstoffablaufs aus dem Hochdruckspeicher, oder durch Reduktion der Förderleistung der HDP erzielt werden. Das Steuerventil ist bspw. als ein Mengensteuerventil (bei 1-Zylinder-Kolben-Hochdruckpumpen) oder als ein Drucksteuerventil (bei 3-Zylinder-Radialkolben-Hochdruckpumpen) ausgebildet.The injection valves are controlled by a control unit of the internal combustion engine. The control unit furthermore has the task of regulating a pressure in the high-pressure accumulator via a pressure control loop. An increase in the injection pressure can be achieved by suitably activating the high-pressure pump arrangement, that is, by increasing the fuel supply into the high-pressure accumulator. A reduction of the injection pressure can be achieved by suitable control of a branching off from the high-pressure accumulator control valve, ie by increasing the fuel flow from the high-pressure accumulator, or by reducing the capacity of the HDP. The control valve is designed, for example, as a quantity control valve (in the case of 1-cylinder piston high-pressure pumps) or as a pressure control valve (in the case of 3-cylinder radial piston high-pressure pumps).

Bei Brennkraftmaschinen mit vier oder weniger Zylindern oder bei Brennkraftmaschinen mit einem relativ geringen Hubraum umfasst die Hochdruckpumpenanordnung in der Regel nur eine Hochdruckpumpe. Diese kann bspw. als eine 1-Zylinder-Kolbenpumpe oder als eine 3-Zylinder-Radialkolbenpumpe ausgebildet sein. Mit der einen Hochdruckpumpe kann bei Brennkraftmaschinen mit vier oder weniger Zylindern bzw. bei Brennkraftmaschinen mit einem relativ geringen Hubraum in sämtlichen Betriebszuständen der Brennkraftmaschine eine zuverlässige Versorgung der Brennräume mit der erforderlichen Kraftstoffmenge sichergestellt werden.In internal combustion engines with four or fewer cylinders or in internal combustion engines with a relatively small displacement, the high-pressure pump assembly usually only one high-pressure pump. This may, for example, be designed as a 1-cylinder piston pump or as a 3-cylinder radial piston pump. With a high-pressure pump can be ensured in internal combustion engines with four or fewer cylinders or in internal combustion engines with a relatively small displacement in all operating conditions of the internal combustion engine, a reliable supply of the combustion chambers with the required amount of fuel.

Es hat sich jedoch gezeigt, dass bei Brennkraftmaschinen mit einem relativ großen Hubraum bzw. bei Brennkraftmaschinen mit sechs und mehr Zylindern eine zuverlässige Kraftstoffversorgung mit nur einer Hochdruckpumpe nicht mehr sichergestellt werden kann. Deshalb ist es aus dem Stand der Technik bekannt, das Kraftstoffzumesssystem auf zwei voneinander unabhängige Kraftstoffkreisläufe aufzuteilen. Die Unabhängigkeit der Kraftstoffkreisläufe setzt voraus, dass zwei Hochdruckspeicher und zwei Druckregelkreise vorhanden sind, die von dem Steuergerät angesteuert und vor allem koordiniert werden müssen. Jeder der Kraftstoffkreisläufe weist eine eigene Hochdruckpumpe auf, die über einen eigenen Druckregelkreis angesteuert wird. Eine solche Unterteilung des Kraftstoffzumesssystems auf zwei Kraftstoffkreisläufe ist aus dem Stand der Technik für 6-Zylinder-Brennkraftmaschinen, wobei dann jeder Kraftstoffkreislauf für die Versorgung der Brennräume von drei Zylindern zuständig ist, und für 8-Zylinder-Brennkraftmaschinen bekannt, wobei dann jeder Kraftstoffkreislauf für die Versorgung der Brennräume von vier Zylindern zuständig ist. Bei den aus dem Stand der Technik bekannten Lösungsansätzen zur Sicherstellung einer zuverlässigen Kraftstoffversorgung bei Brennkraftmaschinen mit einem relativ großen Hubraum bzw. bei 6- oder Mehr-Zylinder-Brennkraftmaschinen handelt es sich um relativ aufwendige und kostspielige Systemlösungen.However, it has been shown that in internal combustion engines with a relatively large displacement or in internal combustion engines with six or more cylinders, a reliable fuel supply with only one high-pressure pump can no longer be ensured. Therefore, it is known in the art to divide the fuel metering system into two independent fuel circuits. The independence of the fuel circuits requires that two high-pressure accumulator and two pressure control loops are present, which must be controlled by the control unit and, above all, coordinated. Each of the fuel circuits has its own high-pressure pump, which is controlled by its own pressure control loop. Such a division of the fuel metering system into two fuel circuits is known from the prior art for 6-cylinder internal combustion engines, in which case each fuel circuit is responsible for supplying the combustion chambers of three cylinders, and for 8-cylinder internal combustion engines, in which case each fuel circuit for the supply of the combustion chambers of four cylinders is responsible. In the known from the prior art approaches to ensure a reliable fuel supply in internal combustion engines with a relatively large displacement or in 6- or multi-cylinder internal combustion engines are relatively complex and costly system solutions.

Aus der DE 198 23 639 A1 ist ein Common-Rail (CR)-Kraftstoffzumesssystem der eingangs beschriebenen Art mit einer Vorförderpumpe und einer Hochdruckpumpe bekannt. Aus der DE 195 23 283 A1 ist eine Hochdruckpumpe für ein Kraftstoffzumesssystem bekannt. Die beschriebene Hochdruckpumpe kann als Radialkolbenpumpe mit drei sternförmig angeordneten Pumpenkolben oder als eine Axialkolbenpumpe mit zwei parallel zueinander angeordneten Pumpenkolben ausgebildet sein. Bei der bekannten Hochdruckpumpe werden die einzelnen Kolben über einen gemeinsamen Nocken- bzw. Exzenterantrieb betätigt. Zwischen den einzelnen Pumpenkolben besteht also eine feste mechanische Kopplung, die einen gezielte Betätigung einzelner Pumpenkolben nicht zulässt. Obwohl die bekannte Hochdruckpumpe mehrere Pumpenkolben aufweist, muss sie doch als eine einzelne Hochdruckpumpe betrachtet werden.From DE 198 23 639 A1 a common rail (CR) fuel metering system of the type described in the introduction with a prefeed pump and a high-pressure pump is known. From DE 195 23 283 A1 a high-pressure pump for a fuel metering system is known. The described high-pressure pump can be designed as a radial piston pump with three star-shaped pump pistons or as an axial piston pump with two pump pistons arranged parallel to one another. In the known high-pressure pump, the individual pistons are actuated via a common cam or eccentric drive. Between the individual pump piston so there is a fixed mechanical coupling, which does not allow targeted operation of individual pump piston. Although the known high-pressure pump has a plurality of pump pistons, it nevertheless has to be regarded as a single high-pressure pump.

Des weiteren sind aus anderen Bereichen der Kraftfahrzeugtechnik, insbesondere aus dem Bereich der Bremssysteme und der aktiven Fahrwerkssysteme, Pumpenanordnungen mit mehreren Pumpenkolben bekannt. So ist bspw. aus der DE 40 41 800 C2 eine als Axialkolbenpumpe ausgebildete Zweikolbenpumpe eines blockiergeschützten Bremssystems mit zwei parallel zueinander angeordneten Pumpenkolben bekannt. Aus der EP 0 448 836 A1 ist eine als Radialkolbenpumpe mit zwei diametral gegenüberliegenden Pumpenkolben ausgebildete Hubkolbenpumpe einer FahrzeugBremsanlage zur Förderung von Flüssigkeit bekannt. Schließlich ist aus der DE 40 27 794 A1 eine Radialkolbenpumpe für die Energieversorgung bei der Fahrzeug-Hydraulik (Antiblockiersystem ABS, Antischlupfregelung ASR, aktive Fahrwerksregelung) bekannt. All diesen Pumpenanordnungen ist gemeinsam, dass zwischen den einzelnen Pumpenkolben eine feste mechanische Kopplung besteht und ein gezieltes Betätigen einzelner Pumpenkolben nicht möglich ist, so dass all diese Pumpenanordnungen als einzelne Pumpen zu betrachten sind.Furthermore, from other areas of automotive engineering, especially in the field of Brake systems and the active suspension systems, pump assemblies with multiple pump piston known. For example, DE 40 41 800 C2 discloses a two-piston pump designed as an axial piston pump of an anti-lock braking system with two pump pistons arranged parallel to one another. EP 0 448 836 A1 discloses a reciprocating piston pump designed as a radial piston pump with two diametrically opposed pump pistons of a vehicle brake system for conveying fluid. Finally, from DE 40 27 794 A1 a radial piston pump for the power supply in the vehicle hydraulics (anti-lock braking system ABS, traction control ASR, active suspension control) known. All these pump arrangements have in common that there is a fixed mechanical coupling between the individual pump pistons and targeted operation of individual pump pistons is not possible, so that all these pump arrangements are to be regarded as individual pumps.

Aus der US 5,433,182 ist ein Kraftstoffzumesssystem und ein Verfahren zum Betreiben eines solchen Kraftstoffzumesssystems der eingangs genannten Art bekannt. Gemäß einem dort beschriebenen Ausführungsbeispiel umfasst das Kraftstoffzumesssystem zwei Hochdruckpumpen, die Kraftstoff aus einem Niederdruckbereich in zwei Hochdruckspeicher fördern. Die beiden Hochdruckspeicher stehen über eine Druckausgleichsleitung, in der ein Steuerventil angeordnet ist, miteinander in Verbindung. In jedem Hochdruckspeicher ist ein eigener Drucksensor vorgesehen, um den in dem Hochdruckspeicher herrschenden Druck zu erfassen. Außerdem ist erwähnt, dass die durch die Hochdruckpumpen in den Hochdruckspeichern erzeugten Drücke unterschiedlich sein können, und dass im Falle einer zu hohe Druckdifferenz zwischen den beiden Hochdruckspeichern ein Kraftstoffzufuhrpfad abgeschaltet wird, indem die entsprechende Hochdruckpumpe deaktiviert wird. Das zeigt, dass bei dem bekannten Kraftstoffzumesssystem die beiden Hochdruckpumpen nicht über einen gemeinsamen Druckregelkreis und mit individuellen Ansteuerzeiten angesteuert werden.From US 5,433,182 a fuel metering system and a method for operating such a Kraftstoffzumesssystems of the aforementioned type is known. According to an embodiment described therein, the fuel metering system comprises two high-pressure pumps that deliver fuel from a low-pressure region into two high-pressure reservoirs. The two high-pressure accumulator are connected via a pressure equalization line, in which a control valve is arranged, with each other. In each high pressure accumulator a separate pressure sensor is provided to detect the pressure prevailing in the high pressure accumulator. It should also be noted that the pressures generated by the high pressure pumps in the high pressure accumulators may be different, and that in case of too high a pressure difference between the two high pressure accumulators, a fuel supply path is switched off by deactivating the corresponding high pressure pump. This shows that in the known fuel metering system the two High-pressure pumps are not controlled by a common pressure control circuit and with individual control times.

Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, auf eine konstruktiv einfache und möglichst kostengünstige Weise insbesondere bei Brennkraftmaschinen mit vier oder mehr Zylindern bzw. bei Brennkraftmaschinen mit einem großen Hubraum eine zuverlässige Kraftstoffversorgung sicherzustellen.The present invention is based on the object to ensure a reliable fuel supply in a structurally simple and most cost-effective manner, especially in internal combustion engines with four or more cylinders or in internal combustion engines with a large displacement.

Zur Lösung dieser Aufgabe schlägt die Erfindung ausgehend von dem Verfahren der eingangs genannten Art vor, dass sämtliche Hochdruckpumpen über einen gemeinsamen Druckregelkreis unabhängig voneinander mit derselben Ansteuerzeit angesteuert werden.To solve this problem, the invention proposes, starting from the method of the type mentioned above, that all high-pressure pumps are controlled via a common pressure control circuit independently of each other with the same drive time.

Vorteile der ErfindungAdvantages of the invention

Erfindungsgemäß wird das Kraftstoffzumesssystem also nicht in mehrere Kraftstoffkreisläufe unterteilt, vielmehr ist nur ein Kraftstoffkreislauf zum Zumessen von Kraftstoff in sämtliche Brennräume der Brennkraftmaschine vorgesehen. Sämtliche Hochdruckpumpen der Hochdruckpumpenanordnung sind in diesem Kraftstoffkreislauf angeordnet. Das erfindungsgemäße Kraftstoffzumesssystem weist vorzugsweise zwei Hochdruckpumpen auf. Die eingesetzten Hochdruckpumpen können als Standardpumpen, bspw. als 1-Zylinder-Kolbenpumpen oder als 3-Zylinder-Radialkolbenpumpen, ausgebildet sein, wie sie an sich aus dem Stand der Technik bekannt sind. Das Steuergerät des Kraftstoffzumesssystems steuert sämtliche Hochdruckpumpen über einen gemeinsamen Druckregelkreis unabhängig voneinander an. In dem Kraftstoffkreislauf ist lediglich ein Hochdruckspeicher angeordnet, dessen Einspritzdruck von nur einem Druckregelkreis geregelt werden kann. Dadurch kann das erfindungsgemäße Verfahren auf besonders einfache und kostengünstige Weise realisiert werden.According to the fuel metering system is thus not divided into several fuel circuits, but only a fuel circuit for metering fuel is provided in all combustion chambers of the internal combustion engine. All high-pressure pumps of the high-pressure pump arrangement are arranged in this fuel circuit. The fuel metering system according to the invention preferably has two high-pressure pumps. The high-pressure pumps used can be designed as standard pumps, for example as 1-cylinder piston pumps or as 3-cylinder radial piston pumps, as they are known per se from the prior art. The control unit of the fuel metering system controls all high-pressure pumps independently of each other via a common pressure control loop. In the fuel circuit only a high-pressure accumulator is arranged, the injection pressure can be controlled by only one pressure control loop. As a result, the inventive method can be particularly simple and cost-effective manner can be realized.

Des weiteren kann mit dem erfindungsgemäßen Verfahren eine zuverlässige Versorgung der Brennräume mit Kraftstoff, insbesondere bei Brennkraftmaschinen mit einem relativ großen Hubraum bzw. bei Brennkraftmaschinen mit vier oder mehr Zylindern, sichergestellt werden.Furthermore, with the method according to the invention a reliable supply of the combustion chambers with fuel, especially in internal combustion engines with a relatively large displacement or in internal combustion engines with four or more cylinders, can be ensured.

Dadurch dass die Hochdruckpumpen in einen gemeinsamen Hochdruckspeicher fördern, ist eine einfache Regelung des in dem Hochdruckspeicher herrschenden Einspritzdrucks mit lediglich einem Druckregelkreis möglich. Nur die Endstufen zur Ansteuerung der Hochdruckpumpen müssen zweimal ausgebildet sein. Gleichzeitig wird mit dem erfindungsgemäßen Verfahren bei nicht symmetrischen Zündfolgen ein komplexer Aufbau des Kraftstoffzumesssystems vermieden.By virtue of the fact that the high-pressure pumps convey into a common high-pressure accumulator, simple regulation of the injection pressure prevailing in the high-pressure accumulator is possible with only one pressure control loop. Only the output stages for controlling the high-pressure pumps must be designed twice. At the same time a complex construction of the Kraftstoffzumesssystems be avoided with the inventive method with non-symmetrical ignition sequences.

Für eine ressourcenschonende Ansteuerung durch das Steuergerät wird vorgeschlagen, dass die Hochdruckpumpen mit derselben Ansteuerzeit angesteuert werden. Die Ansteuerzeit wird also in dem Steuergerät nur einmal für sämtliche Hochdruckpumpen des Kraftstoffzumesssystems berechnet. Die Ansteuerung der einzelnen Hochdruckpumpen erfolgt dann über eine Umschalteinrichtung, die zu den entsprechenden Zeitpunkten bzw. bei der entsprechenden Winkelstellung der Kurbelwelle der Brennkraftmaschine zwischen den ersten Hochdruckpumpen und den zweiten Hochdruckpumpen umschaltet. Auf diese Weise können mit derselben Ansteuerzeit abwechselnd die ersten Hochdruckpumpen und die zweiten Hochdruckpumpen angesteuert werden.For a resource-saving control by the control unit, it is proposed that the high-pressure pumps are driven with the same activation time. The activation time is thus calculated in the control unit only once for all high-pressure pumps of the fuel metering system. The control of the individual high-pressure pumps then takes place via a switching device which switches over at the corresponding times or at the corresponding angular position of the crankshaft of the internal combustion engine between the first high-pressure pumps and the second high-pressure pumps. In this way, the first high-pressure pumps and the second high-pressure pumps can be activated alternately with the same activation time.

Gemäß einer vorteilhaften Weiterbildung der vorliegenden Erfindung wird vorgeschlagen, dass die Hochdruckpumpen parallel zueinander angesteuert werden. Die Hochdruckpumpen werden also synchron angesteuert und durchlaufen gleichzeitig einen Saughub und einen Förderhub.According to an advantageous development of the present invention, it is proposed that the high-pressure pumps are actuated parallel to one another. The high-pressure pumps are thus controlled synchronously and simultaneously pass through a suction stroke and a delivery stroke.

Alternativ wird gemäß einer anderen vorteilhaften Weiterbildung der vorliegenden Erfindung vorgeschlagen, dass eine oder mehrere erste Hochdruckpumpen entgegengesetzt zu einer oder mehreren zweiten Hochdruckpumpen angesteuert werden. Die ersten Hochdruckpumpen und die zweiten Hochdruckpumpen durchlaufen den Saughub und den Förderhub versetzt zueinander, d.h. wenn sich die ersten Hochdruckpumpen im Saughub befinden, befinden sich die zweiten Hochdruckpumpen im Förderhub und umgekehrt, wenn sich die ersten Hochdruckpumpen im Förderhub befinden, befinden sich die zweiten Hochdruckpumpen im Saughub. Der Vorteil dieser Weiterbildung liegt darin, dass eine deutliche Reduzierung der unterschiedlichen Druckniveaus von aufeinanderfolgenden Einspritzungen erzielt werden kann, da die Nachförderung gleichmäßig verteilt ist. Ein weiterer Vorteil besteht in der Möglichkeit einer einfachen Diagnose der Hochdruckpumpen, indem der Verlauf des in dem Hochdruckspeicher herrschenden Einspritzdrucks überwacht wird.Alternatively, according to another advantageous development of the present invention, it is proposed that one or more first high-pressure pumps be controlled in opposition to one or more second high-pressure pumps. The first high-pressure pumps and the second high-pressure pumps pass through the suction stroke and the delivery stroke offset from each other, i. when the first high-pressure pumps are in the suction stroke, the second high-pressure pumps are in the delivery stroke and vice versa, when the first high-pressure pumps are in the delivery stroke, the second high-pressure pumps are in the suction stroke. The advantage of this development is that a significant reduction of the different pressure levels can be achieved by successive injections, since the Nachförderung is evenly distributed. Another advantage is the possibility of a simple diagnosis of the high-pressure pumps by monitoring the course of the pressure prevailing in the high-pressure accumulator injection pressure.

Als eine weitere Lösung der Aufgabe der vorliegenden Erfindung wird ausgehend von dem Kraftstoffzumesssystem der eingangs genannten Art vorgeschlagen, dass das Steuergerät einen Druckregelkreis für sämtliche Hochdruckpumpen umfasst und die Hochdruckpumpen unabhängig voneinander mit derselben Ansteuerzeit ansteuert.As a further solution of the object of the present invention, it is proposed on the basis of the fuel metering system of the type mentioned above that the control unit comprises a pressure control loop for all high-pressure pumps and controls the high-pressure pumps independently with the same drive time.

Gemäß eine bevorzugten Weiterbildung der vorliegenden Erfindung wird vorgeschlagen, dass die Hochdruckpumpenanordnung zwei Hochdruckpumpen aufweist.According to a preferred development of the present invention, it is proposed that the high-pressure pump arrangement has two high-pressure pumps.

Gemäß einer bevorzugten Ausführungsform der vorliegenden Erfindung wird vorgeschlagen, dass das Steuergerät die Hochdruckpumpen parallel zueinander ansteuert. Alternativ wird vorgeschlagen, dass das Steuergerät eine oder mehrere erste Hochdruckpumpen entgegengesetzt zu einer oder mehreren zweiten Hochdruckpumpen ansteuert.According to a preferred embodiment of the present invention, it is proposed that the control unit controls the high-pressure pumps in parallel with one another. Alternatively, it is proposed that the control unit controls one or more first high pressure pumps opposite to one or more second high pressure pumps.

Ausgehend von der direkteinspritzenden Brennkraftmaschine der eingangs genannten Art wird zur Lösung der Aufgabe der vorliegenden Erfindung des weiteren vorgeschlagen, dass das Kraftstoffzumesssystem nach einem der Ansprüche 4 bis 7 ausgebildet ist.Starting from the direct injection internal combustion engine of the type mentioned above, it is further proposed to achieve the object of the present invention that the fuel metering system according to one of claims 4 to 7 is formed.

Gemäß einer vorteilhaften Weiterbildung der vorliegenden Erfindung wird vorgeschlagen, dass die Brennkraftmaschine mindestens sechs Zylinder aufweist.According to an advantageous development of the present invention, it is proposed that the internal combustion engine has at least six cylinders.

Gemäß einer bevorzugten Ausführungsform der Erfindung weist das Kraftstoffzumesssystem zwei Hochdruckspeicherbereiche auf, die miteinander über eine Druckausgleichsleitung in Verbindung stehen. Durch die Druckausgleichsleitung werden die beiden Hochdruckspeicherbereiche zu einem gemeinsamen Hochdruckspeicher zusammengefasst.According to a preferred embodiment of the invention, the fuel metering system has two high-pressure storage areas, which communicate with each other via a pressure equalization line. By the pressure equalization line the two high-pressure storage areas are combined to form a common high-pressure accumulator.

Von besonderer Bedeutung ist die Realisierung des erfindungsgemäßen Verfahrens in der Form eines Steuerelements, das für ein Steuergerät einer direkteinspritzenden Brennkraftmaschine vorgesehen ist. Dabei ist auf dem Steuerelement ein Programm abgespeichert, das auf einem Rechengerät, insbesondere auf einem Mikroprozessor, ablauffähig und zur Ausführung des erfindungsgemäßen Verfahrens geeignet ist. In diesem Fall wird also die Erfindung durch ein auf dem Steuerelement abgespeichertes Programm realisiert, so dass dieses mit dem Programm versehene Steuerelement in gleicher Weise die Erfindung darstellt wie das Verfahren, zu dessen Ausführung das Programm geeignet ist. Als Steuerelement kann insbesondere ein elektrisches Speichermedium zur Anwendung kommen, bspw. ein Read-Only-Memory oder ein Flash-Memory.Of particular importance is the realization of the method according to the invention in the form of a control element which is provided for a control device of a direct injection internal combustion engine. In this case, a program is stored on the control, which is executable on a computing device, in particular on a microprocessor, and suitable for carrying out the method according to the invention. In this case, therefore, the invention is realized by a program stored on the control program, so that this provided with the program control in the same way is the invention as the method to whose execution the program is suitable. In particular, an electrical storage medium can be used as the control, for example a read-only memory or a flash memory.

Schließlich wird ausgehend von dem Steuergerät der eingangs genannten Art als noch eine weitere Lösung der Aufgabe der vorliegenden Erfindung vorgeschlagen, dass das Steuergerät ein Steuerelement nach Anspruch 11 aufweist.Finally, starting from the control unit of the type mentioned as yet another solution to the problem of Present invention proposed that the control device comprises a control according to claim 11.

Zeichnungdrawing

Weitere Merkmale, Anwendungsmöglichkeiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen der Erfindung, die in der Zeichnung dargestellt sind. Dabei bilden alle beschriebenen oder dargestellten Merkmale für sich oder in beliebiger Kombination den Gegenstand der Erfindung, unabhängig von ihrer Zusammenfassung in den Patentansprüchen oder deren Rückbeziehung sowie unabhängig von ihrer Formulierung bzw. Darstellung in der Beschreibung bzw. in der Zeichnung. Es zeigen:

Figur 1
ein schematisches Blockschaltbild eines Ausführungsbeispiels einer erfindungsgemäßen Brennkraftmaschine;
Figur 2
ein schematisches Blockschaltbild eines ersten Ausführungsbeispiels eines erfindungsgemäßen Kraftstoffzumesssystems;
Figur 3
ein Diagramm zur Verdeutlichung eines Ausführungsbeispiels eines erfindungsgemäßen Verfahrens zum Betreiben des Kraftstoffzumesssystems aus Figur 2;
Figur 4
ein schematisches Blockschaltbild eines zweiten Ausführungsbeispiels eines erfindungsgemäßen Kraftstoffzumesssystems im Ausschnitt;
Figur 5
ein Diagramm zur Verdeutlichung eines zweiten Ausführungsbeispiels eines erfindungsgemäßen Verfahrens zum Betreiben des Kraftstoffzumesssystems aus Figur 4; und
Figur 6
ein Diagramm zur Verdeutlichung eines dritten Ausführungsbeispiels eines erfindungsgemäßen Verfahrens zum Betreiben des Kraftstoffzumesssystems aus Figur 4.
Other features, applications and advantages of the invention will become apparent from the following description of exemplary embodiments of the invention, which are illustrated in the drawing. All described or illustrated features, alone or in any combination form the subject matter of the invention, regardless of their summary in the claims or their dependency and regardless of their formulation or representation in the description or in the drawing. It demonstrate:
FIG. 1
a schematic block diagram of an embodiment of an internal combustion engine according to the invention;
FIG. 2
a schematic block diagram of a first embodiment of a fuel metering system according to the invention;
FIG. 3
a diagram illustrating an embodiment of a method according to the invention for operating the Kraftstoffzumesssystems of Figure 2;
FIG. 4
a schematic block diagram of a second embodiment of a fuel metering system according to the invention in the neck;
FIG. 5
a diagram illustrating a second embodiment of a method according to the invention for operating the Kraftstoffzumesssystems of Figure 4; and
FIG. 6
3 is a diagram for illustrating a third exemplary embodiment of a method according to the invention for operating the fuel metering system from FIG. 4.

In Figur 1 ist eine direkteinspritzende Brennkraftmaschine 1 eines Kraftfahrzeugs dargestellt, bei der ein Kolben 2 in einem Zylinder 3 hin- und herbewegbar ist. Der Zylinder 3 ist mit einem Brennraum 4 versehen, der u.a. durch den Kolben 2, ein Einlassventil 5 und ein Auslassventil 6 begrenzt ist. Mit dem Einlassventil 5 ist ein Ansaugrohr 7 und mit dem Auslassventil 6 ein Abgasrohr 8 gekoppelt.1 shows a direct-injection internal combustion engine 1 of a motor vehicle is shown, in which a piston 2 in a cylinder 3 back and forth. The cylinder 3 is provided with a combustion chamber 4, which inter alia by the piston 2, an inlet valve 5 and an outlet valve. 6 is limited. With the intake valve 5, an intake pipe 7 and the exhaust valve 6, an exhaust pipe 8 is coupled.

Im Bereich des Einlassventils 5 und des Auslassventils 6 ragen ein Einspritzventil 9 und eine Zündkerze 10 in den Brennraum 4. Über das Einspritzventil 9 kann Kraftstoff in den Brennraum 4 eingespritzt werden. Mit der Zündkerze 10 kann der Kraftstoff in dem Brennraum 4 entzündet werden.In the region of the inlet valve 5 and the outlet valve 6, an injection valve 9 and a spark plug 10 protrude into the combustion chamber 4. Via the injection valve 9, fuel can be injected into the combustion chamber 4. With the spark plug 10, the fuel in the combustion chamber 4 can be ignited.

Der Kolben 2 wird durch die Verbrennung des Kraftstoffs in dem Brennraum 4 in eine Hin- und Herbewegung versetzt, die auf eine nicht dargestellte Kurbelwelle übertragen wird und auf diese ein Drehmoment ausübt.The piston 2 is set by the combustion of the fuel in the combustion chamber 4 in a reciprocating motion, which is transmitted to a crankshaft, not shown, and exerts on this torque.

Die Brennkraftmaschine 1 weist ein Kraftstoffzumesssystem 11 auf, durch das der über das Einspritzventil 9 in den Brennraum 4 einzuspritzende Kraftstoff zugemessen wird. Das Kraftstoffzumesssystem 11 weist einen Kraftstoffvorratsbehälter 12 auf, aus dem von einer als Elektrokraftstoffpumpe ausgebildeten Vorförderpumpe 13 Kraftstoff in einen Niederdruckbereich ND des Kraftstoffzumesssystems 11 gefördert wird. Eine Hochdruckpumpenanordnung bestehend aus zwei Hochdruckpumpen 14 und 15 fördert Kraftstoff aus dem Niederdruckbereich ND in einen Hochdruckspeicher 16. Die Hochdruckpumpen 14, 15 sind als Ein-Zylinder-Hochdruckpumpen mit jeweils zwei Rückschlagventilen 17 und einem Mengensteuerventil 18 ausgebildet. Durch die Mengensteuerventile 18 kann eine Mengensteuerleitung 19 geöffnet bzw. geschlossen werden. Bei einer geöffneten Mengensteuerleitung 19 fließt wird der angesaugte Kraftstoff wieder in den Niederdruckkreislauf zurückgeschoben, anstatt in den Hochdruckkreis gefördert zu werden. Die Mengensteuerventile 18 werden mittels Ansteuersignale T angesteuert. Alternativ können die Hochdruckpumpen 14, 15 auch als Drei-Zylinder-Radialkolbenpumen ausgebildet sein. Entscheidend ist, dass Standard-Hochdruckpumpen und keine aufwendigen und teuren Sonderanfertigungen als Hochdruckpumpen 14, 15 eingesetzt werden.The internal combustion engine 1 has a fuel metering system 11, by which the fuel to be injected via the injection valve 9 into the combustion chamber 4 is metered. The fuel metering system 11 has a fuel reservoir 12 from which fuel is conveyed into a low-pressure region ND of the fuel metering system 11 by a prefeed pump 13 designed as an electric fuel pump. A high-pressure pump arrangement consisting of two high-pressure pumps 14 and 15 delivers fuel from the low-pressure area ND into a high-pressure accumulator 16. The high-pressure pumps 14, 15 are designed as single-cylinder high-pressure pumps with two non-return valves 17 and one quantity control valve 18. Through the quantity control valves 18, a quantity control line 19 can be opened or closed. When an open quantity control line 19 flows, the sucked fuel is pushed back into the low pressure circuit, instead of being conveyed into the high pressure circuit. The quantity control valves 18 are actuated by means of control signals T. Alternatively, the high pressure pumps 14, 15 may be formed as three-cylinder radial piston. It is crucial that Standard high-pressure pumps and no costly and expensive custom-made as high-pressure pumps 14, 15 are used.

Der Hochdruckspeicher 16 ist als eine Speicherleiste eines Common-Rail (CR)-Kraftstoffzumesssystems ausgebildet. An dem Hochdruckspeicher 16 ist ein Drucksensor angeordnet, der den in dem Hochdruckspeicher 16 herrschenden Einspritzdruck erfasst und ein entsprechendes Ausgangssignal p_r erzeugt. Aus dem Hochdruckspeicher 16 münden mehrere - im vorliegenden Fall vier - Einspritzventile 9, über die Kraftstoff in die Brennräume 4 der Zylinder 3 der Brennkraftmaschine 1 eingespritzt wird. Zum Einspritzen von Kraftstoff werden die Einspritzventile 9 mit einem entsprechenden Ansteuersignal ES angesteuert. Die Zündkerze 10 wird durch ein Ansteuersignal ZW angesteuert.The high pressure accumulator 16 is formed as a storage bar of a common rail (CR) fuel metering system. At the high pressure accumulator 16, a pressure sensor is arranged, which detects the pressure prevailing in the high-pressure accumulator 16 injection pressure and generates a corresponding output signal p_r. From the high pressure accumulator 16 open several - in the present case four - injectors 9, is injected via the fuel into the combustion chambers 4 of the cylinder 3 of the internal combustion engine 1. For injecting fuel, the injection valves 9 are actuated with a corresponding drive signal ES. The spark plug 10 is driven by a drive signal ZW.

Um den Druck in dem Niederdruckbereich ND des Kraftstoffzumesssystems 11 auf einem vorgebbaren Wert zu halten, ist in dem Niederdruckbereich ND ein Niederdruckregler 20 angeordnet, über den Kraftstoff aus dem Niederdruckbereich ND zurück in den Kraftstoffvorratsbehälter 12 fließen kann, falls der Druck in dem Niederdruckbereich ND einen vorgebbaren Druckwert übersteigt. Zwischen der Vorförderpumpe 13 und den Hochdruckpumpen 14, 15 ist ein Filter 21 angeordnet.In order to keep the pressure in the low-pressure region ND of the fuel metering system 11 to a predeterminable value, a low-pressure regulator 20 is arranged in the low-pressure region ND, via which fuel from the low-pressure region ND can flow back into the fuel reservoir 12, if the pressure in the low-pressure region ND exceeds specified pressure value. Between the prefeed pump 13 and the high pressure pumps 14, 15, a filter 21 is arranged.

Ein Steuergerät 22 ist von Eingangssignalen 23 beaufschlagt, die mittels Sensoren gemessene Betriebsgrößen der Brennkraftmaschine 1 darstellen. Bspw. ist das Steuergerät 22 mit einem Luftmassensensor, einem Lambda-Sensor, einem Drehzahlsensor oder einem in dem Hochdruckbereich HD, vorzugsweise in dem Hochdruckspeicher 16, angeordneten Drucksensor 24 u.dgl. verbunden. Das Steuergerät 22 erzeugt Ausgangssignale 25, mit denen über Aktoren bzw. Steller das Verhalten der Brennkraftmaschine 1 beeinflusst werden kann. Bspw. ist das Steuergerät 22 mit dem Einspritzventil 9 (Steuersignal ES), der Zündkerze 10 (Steuersignal ZW), den Mengensteuerventilen 18 (Steuersignal T), einer in dem Ansaugrohr 7 angeordneten Drosselklappe u.dgl. verbunden und erzeugt die zu deren Ansteuerung erforderlichen Signale.A control unit 22 is acted upon by input signals 23, which represent operating variables of the internal combustion engine 1 measured by means of sensors. For example. is the control unit 22 with an air mass sensor, a lambda sensor, a speed sensor or in the high pressure area HD, preferably in the high-pressure accumulator 16, arranged pressure sensor 24 and the like. connected. The control unit 22 generates output signals 25, with which over Actuators or Steller the behavior of the internal combustion engine 1 can be influenced. For example. is the control unit 22 with the injection valve 9 (control signal ES), the spark plug 10 (control signal ZW), the quantity control valves 18 (control signal T), arranged in the intake manifold 7 throttle valve and the like. connected and generates the signals required for their control.

Unter anderem ist das Steuergerät 22 dazu vorgesehen, die Betriebsgrößen der Brennkraftmaschine 1 zu steuern und/oder zu regeln. Bspw. wird die von dem Einspritzventil 9 in den Brennraum 4 eingespritzte Kraftstoffmasse von dem Steuergerät 22 insbesondere im Hinblick auf einen geringen Kraftstoffverbrauch und/oder eine geringe Schadstoffemission gesteuert und/oder geregelt. Zu diesem Zweck ist das Steuergerät 22 mit einem Mikroprozessor versehen, der in einem Steuerelement, insbesondere in einem Read-Only-Memory oder einem Flash-Memory, ein Programm abgespeichert hat, das dazu geeignet ist, die genannte Steuerung und/oder Regelung durchzuführen. In dem Steuerelement ist des weiteren ein Programm gespeichert, das zur Ausführung des erfindungsgemäßen Verfahrens geeignet ist.Among other things, the control unit 22 is provided to control the operating variables of the internal combustion engine 1 and / or to regulate. For example. the fuel mass injected by the injection valve 9 into the combustion chamber 4 is controlled and / or regulated by the control unit 22, in particular with regard to low fuel consumption and / or low pollutant emission. For this purpose, the control unit 22 is provided with a microprocessor which has stored in a control, in particular in a read-only memory or a flash memory, a program which is adapted to perform said control and / or regulation. In addition, a program is stored in the control which is suitable for carrying out the method according to the invention.

Die Brennkraftmaschine 1 aus Figur 1 kann in einer Vielzahl von Betriebsarten betrieben werden. So ist es möglich, die Brennkraftmaschine 1 in einem Homogenbetrieb, einem Schichtbetrieb, einem homogenen Magerbetrieb u.dgl. zu betreiben. Zwischen den genannten Betriebsarten der Brennkraftmaschine kann umgeschaltet werden. Derartige Umschaltungen werden von dem Steuergerät 22 durchgeführt.The internal combustion engine 1 of Figure 1 can be operated in a variety of modes. Thus, it is possible, the internal combustion engine 1 in a homogeneous operation, a shift operation, a homogeneous lean operation and the like. to operate. It is possible to switch over between the aforementioned operating modes of the internal combustion engine. Such switching is performed by the controller 22.

Das in Figur 1 dargestellte Kraftstoffzumesssystem 11 zeichnet sich insbesondere dadurch aus, dass es nur einen Kraftstoffkreislauf zum Zumessen von Kraftstoff in sämtliche Brennräume 4 der Brennkraftmaschine 1 aufweist.The fuel metering system 11 illustrated in FIG. 1 is characterized in particular in that it has only one fuel circuit for metering fuel into all combustion chambers 4 of the internal combustion engine 1.

In diesem einen Kraftstoffkreislauf sind beide Hochdruckpumpen 14, 15 angeordnet. Beide Hochdruckpumpen 14, 15 werden über einen gemeinsamen Druckregelkreis unabghängig voneinander durch das Steuergerät 22 angesteuert. Für einen resourcenschonenden Betrieb des Kraftstoffzumesssystems 11 werden beide Hochdruckpumpen 14, 15 mit derselben Ansteuerzeit T angesteuert. Die Ansteuerzeit T wird also für beide Hochdruckpumpen 14, 15 in dem Steuergerät 22 nur einmal berechnet.In this one fuel circuit both high-pressure pumps 14, 15 are arranged. Both high-pressure pumps 14, 15 are actuated independently of one another by the control unit 22 via a common pressure control loop. For resource-conserving operation of the fuel metering system 11, both high-pressure pumps 14, 15 are actuated with the same drive time T. The activation time T is therefore calculated only once for both high-pressure pumps 14, 15 in the control unit 22.

In Figur 1 ist das erfindungsgemäße Kraftstoffzumessystem 11 für eine Brennkraftmaschine 1 mit vier Zylindern 3 dargestellt. Durch das erfindungsgemäße Kraftstoffzumessystem 11 wird eine zuverlässige Kraftstoffversorgung der Brennräume 4 auch von Brennkraftmaschinen 1 mit mehr als vier Zylindern 3 und/oder einem großen Hubraum sichergestellt.FIG. 1 shows the fuel metering system 11 according to the invention for an internal combustion engine 1 with four cylinders 3. The fuel metering system 11 according to the invention ensures reliable fuel supply to the combustion chambers 4, even of internal combustion engines 1 with more than four cylinders 3 and / or a large displacement.

In Figur 2 ist ein erfindungsgemäßes Kraftstoffzumesssystem 11 am Beispiel einer 8-Zylinder-Brennkraftmaschine 1 dargestellt. Bei der 8-Zylinder-Brennkraftmaschine 1 umfasst der Hochdruckspeicher 16 eine linke Bank 16' und eine rechte Bank 16" . Die beiden Bänke 16', 16" stehen über eine Druckausgleichsleitung 26 miteinander in Verbindung, so dass in beiden Bänken 16', 16" derselbe Einspritzdruck herrscht und die Bänke 16', 16" als ein gemeinsamer Hochdruckspeicher 16 betrachtet werden können. Von jeder Bank 16', 16" zweigen vier Einspritzventile 9 ab, über die Kraftstoff in die Brennräume 4 der Brennkraftmaschine 1 eingespritzt werden kann. Jede Bank 16', 16" wird von einer eigenen Hochdruckpumpe 14; 15 mit Kraftstoff aus dem Niederdruckbereich ND versorgt. Jeder Hochdruckpumpe 14; 15 ist eine eigene Endstufe 27; 28 zugeordnet.FIG. 2 shows an inventive fuel metering system 11 using the example of an 8-cylinder internal combustion engine 1. In the 8-cylinder internal combustion engine 1, the high-pressure accumulator 16 comprises a left bank 16 'and a right bank 16 "The two banks 16', 16" communicate with one another via a pressure equalization line 26, so that in both banks 16 ', 16 "the same injection pressure prevails and the banks 16 ', 16" can be considered as a common high-pressure accumulator 16. From each bank 16 ', 16 "branch off four injection valves 9, via which fuel can be injected into the combustion chambers 4 of the internal combustion engine 1. Each bank 16', 16" is driven by its own high-pressure pump 14; 15 supplied with fuel from the low pressure region ND. Each high-pressure pump 14; 15 is a separate output stage 27; 28 assigned.

Das Steuergerät 22 ermittelt die Ansteuerzeit T nur einmal für beide Hochdruckpumpen 14, 15. Die Verteilung des Steuersignals T auf die Endstufen 27, 28 der beiden Hochdruckpumpen 14, 15 erfolgt über einen Schalter 29. Der Schalter 29 wird nach einem Synchro-Raster für die 8-Zylinder-Brennkraftmaschine 1 alle 180° der Kurbelwelle KW umgeschaltet. Bei einer verstellbaren Nockenwelle als Antrieb für die Hochdruckpumpen 14, 15 ist das Synchro-Raster basierend auf der verstellbaren Nockenwelle entsprechend abzuleiten.The control unit 22 determines the drive time T only once for both high-pressure pumps 14, 15. The distribution of the control signal T to the output stages 27, 28 of the two high pressure pumps 14, 15 via a switch 29. The switch 29 is after a synchro-grid for the 8-cylinder internal combustion engine 1 every 180 ° the crankshaft KW switched. With an adjustable camshaft as a drive for the high-pressure pumps 14, 15, the synchro-grid is based on the adjustable camshaft derived accordingly.

Aufgrund der begrenzten Steilheit der Nocken zum Antrieb der Hochdruckpumpen 14, 15 kann bei 1-Zylinder-Hochdruckpumpen bei einer Brennkraftmaschine 1 mit acht Zylindern keine Nockenwelle mit vier Nocken pro Umdrehung eingesetzt werden. Gleichzeitig können die Kraftstoffkreisläufe bei einer 8-Zylinder-Brennkraftmaschine 1 nicht entsprechend der mechanischen Anordnung (linke Bank 16', rechte Bank 16'') angeordnet werden, da die Zündfolge bzw. die Einspritzfolge nicht symmetrisch ist, d.h. sie springt nicht abwechselnd von der linken Bank 16' zu der rechten Bank 16''. Hier schafft das erfindungsgemäße Kraftstoffzumesssystem Abhilfe.Due to the limited steepness of the cams for driving the high-pressure pumps 14, 15 can be used in 1-cylinder high-pressure pumps in an internal combustion engine 1 with eight cylinders no camshaft with four cams per revolution. At the same time, in an 8-cylinder internal combustion engine 1, the fuel circuits can not be arranged according to the mechanical arrangement (left bank 16 ', right bank 16' ') because the firing order or injection sequence is not symmetrical, i. it does not jump alternately from the left bank 16 'to the right bank 16' '. Here, the fuel metering system according to the invention provides a remedy.

In Figur 3 ist eine Ansteuerung der Hochdruckpumpen 14, 15 des Kraftstoffzumesssystems 1 aus Figur 2 gemäß einer bevorzugten Ausführungsform dargestellt. In der oberen Hälfte von Figur 3 ist der Hub h_1 der Hochdruckpumpe 14 und in dem unteren Teil der Hub h_2 der Hochdruckpumpe 15 dargestellt. Es ist deutlich zu erkennen, dass die beiden Hochdruckpumpen 14, 15 entgegengesetzt zueinander angesteuert werden. Des Weiteren kann Figur 3 entnommen werden, wann die Pumpenkolben der Hochdruckpumpen 14, 15 einen Saughub ausführen bzw. wann sie in einem Förderhub Kraftstoff in den Hochdruckspeicher 16 fördern.FIG. 3 shows a control of the high-pressure pumps 14, 15 of the fuel metering system 1 from FIG. 2 in accordance with a preferred embodiment. In the upper half of Figure 3, the stroke h_1 of the high pressure pump 14 and in the lower part of the stroke h_2 of the high pressure pump 15 is shown. It can be clearly seen that the two high pressure pumps 14, 15 are actuated opposite to each other. Furthermore, FIG. 3 shows when the pump pistons of the high-pressure pumps 14, 15 perform a suction stroke or when they convey fuel into the high-pressure reservoir 16 in a delivery stroke.

In Figur 4 ist ein erfindungsgemäßes Kraftstoffzumesssystem 11 für eine Brennkraftmaschine mit sechs Zylindern 3 im Ausschnitt dargestellt. Gemäß diesem Ausführungsbeispiel münden aus dem Hochdruckspeicher 16 sechs Einspritzventile 9, über die Kraftstoff in die Brennräume 4 der einzelnen Zylinder 3 eingespritzt werden kann. Wie bei dem Kraftstoffzumesssystem 11 aus Figur 1 wird auch hier durch zwei Hochdruckpumpen 14, 15 Kraftstoff aus dem Niederdruckbereich ND des Kraftstoffzumesssystems 11 in den Hochdruckspeicher 16 gefördert. Auch das in Figur 4 dargestellte Kraftstoffzumesssystem 11 weist lediglich einen Kraftstoffkreislauf zum Zumessen von Kraftstoff in sämtliche Brennräume 4 der Brennkraftmaschine 1 auf. Beide Hochdruckpumpen 14, 15 sind in diesem einen Kraftstoffkreislauf angeordnet. Beide Hochdruckpumpen 14, 15 werden über einen gemeinsamen Druckregelkreis unabhängig voneinander angesteuert (vgl. Figur 2).FIG. 4 shows a fuel metering system according to the invention 11 for an internal combustion engine with six cylinders 3 shown in detail. According to this embodiment, six injection valves 9, via which fuel can be injected into the combustion chambers 4 of the individual cylinders 3, discharge from the high-pressure reservoir 16. As in the case of the fuel metering system 11 from FIG. 1, fuel is also conveyed from the low-pressure region ND of the fuel metering system 11 into the high-pressure accumulator 16 by two high-pressure pumps 14, 15. The fuel metering system 11 shown in FIG. 4 also has only one fuel circuit for metering fuel into all combustion chambers 4 of the internal combustion engine 1. Both high-pressure pumps 14, 15 are arranged in this one fuel circuit. Both high-pressure pumps 14, 15 are controlled independently of one another via a common pressure control loop (cf., FIG. 2).

In den Figuren 5 und 6 sind zwei verschiedene Möglichkeiten zum Ansteuern der Hochdruckpumpen 14, 15 des Kraftstoffzumesssystems 11 aus Figur 4 dargestellt. Bei dem in Figur 5 dargestellten Ausführungsbeispiel werden die Hochdruckpumpen 14, 15 parallel zueinander angesteuert. Bei dem Ausführungsbeispiel nach Figur 6 werden die Hochdruckpumpen 14, 15 dagegen - ähnlich wie bei dem Ausführungsbeispiel aus Figur 3 - entgegengesetzt zueinander angesteuert. In Übereinstimmung mit dem Ausführungsbeispiel aus Figur 3 sind in den Figuren 5 und 6 Saughub und Förderhub eingezeichnet.FIGS. 5 and 6 show two different possibilities for driving the high-pressure pumps 14, 15 of the fuel metering system 11 from FIG. 4. In the embodiment shown in Figure 5, the high pressure pumps 14, 15 are driven in parallel. In contrast, in the exemplary embodiment according to FIG. 6, the high-pressure pumps 14, 15 are actuated in opposite directions, as in the exemplary embodiment of FIG. 3. In accordance with the embodiment of Figure 3 are shown in Figures 5 and 6 suction stroke and delivery stroke.

Claims (12)

  1. Method for operating a fuel metering system (11) of a direct-injection internal combustion engine (1), having a fuel storage tank (12), having at least one prefeed pump (13) for feeding fuel from the fuel storage tank (12) into a low pressure region (ND) of the fuel metering system (11), having a high pressure pump arrangement with at least two high pressure pumps (14, 15) for feeding fuel from the low pressure region (ND) into at least one high pressure accumulator (16; 16', 16'') , having a control unit (22) for regulating an injection pressure (p_r) prevailing in the high pressure accumulator (16; 16', 1 6''), and having fuel injection valves (9) for injecting fuel from the high pressure accumulator (16; 16', 16") into combustion chambers (4) of the internal combustion engine (1), the fuel metering system (11) having a fuel circuit for metering fuel into all of the combustion chambers (4) of the internal combustion engine (1), and all of the high pressure pumps (14, 15) being arranged in the fuel circuit, characterized in that all of the high pressure pumps (14, 15) are actuated independently of one another, with the same actuating time (T), by means of a common pressure regulating circuit.
  2. Method according to Claim 1, characterized in that the high pressure pumps (14, 15) are actuated in parallel to one another.
  3. Method according to Claim 1, characterized in that one or more first high pressure pumps (14) are actuated in opposition to one or more second high pressure pumps (15).
  4. Fuel metering system (11) of a direct-injection internal combustion engine (1), having a fuel storage tank (12), having at least one prefeed pump (13) for feeding fuel from the fuel storage tank (12) into a low pressure region (ND) of the fuel metering system (11), having a high pressure pump arrangement with at least two high pressure pumps (14, 15) for feeding fuel from the low pressure region (ND) into at least one high pressure accumulator (16; 16', 16"), having a control unit (22) for regulating an injection pressure (p_r) prevailing in the high pressure accumulator (16; 16', 16"), and having fuel injection valves (9) for injecting fuel from the high pressure accumulator (16; 16', 16") into combustion chambers (4) of the internal combustion engine (1), the fuel metering system (11) having a fuel circuit for metering fuel into all of the combustion chambers (4) of the internal combustion engine (1), and all of the high pressure pumps (14, 15) being arranged in the fuel circuit, characterized in that the control unit (22) comprises a pressure regulating circuit for all of the high pressure pumps (14, 15) and actuates the high pressure pumps (14, 15) independently of one another with the same actuating time (T).
  5. Fuel metering system (11) according to Claim 4, characterized in that the high pressure pump arrangement has two high pressure pumps (14, 15).
  6. Fuel metering system (11) according to Claim 4 or 5, characterized in that the control unit (22) actuates the high pressure pumps (14, 15) in parallel to one another.
  7. Fuel metering system (11) according to Claim 4 or 5, characterized in that the control unit (22) actuates one or more first high pressure pumps (14) in opposition to one or more second high pressure pumps (15).
  8. Direct-injection internal combustion engine (1) having a fuel metering system (11) which comprises a fuel storage tank (12), at least one prefeed pump (13) for feeding fuel from the fuel storage tank (12) into a low pressure region (ND) of the fuel metering system (11), a high pressure pump arrangement with at least two high pressure pumps (14, 15) for feeding fuel from the low pressure region (ND) into at least one high pressure accumulator (16; 16', 16"), a control unit (22) for regulating an injection pressure (p_r) prevailing in the high pressure accumulator (16; 16', 16"), and fuel injection valves (9) for injecting fuel from the high pressure accumulator (16; 16', 16") into combustion chambers (4) of the internal combustion engine (1), characterized in that the fuel metering system (11) is embodied according to one of Claims 4 to 7.
  9. Internal combustion engine (1) according to Claim 8, characterized in that the internal combustion engine (1) has at least six cylinders (3).
  10. Internal combustion engine (1) according to Claim 8 or 9, characterized in that the fuel metering system (11) has two high pressure accumulator regions (16', 16") which are connected to one another by means of a pressure equalizing line (26).
  11. Control element, in particular read-only memory (ROM) or flash memory, for a control unit (22) of a direct-injection internal combustion engine (1), on which is stored a program which can be executed on a processing unit, in particular on a microprocessor, and is programmed for carrying out a method according to one of Claims 1 to 3.
  12. Control unit (22) for a direct-injection internal combustion engine (1) having a fuel metering system (11) which comprises a fuel storage tank (12), at least one prefeed pump (13) for feeding fuel from the fuel storage tank (12) into a low pressure region (ND) of the fuel metering system (11), a high pressure pump arrangement with at least two high pressure pumps (14, 15) for feeding fuel from the low pressure region (ND) into at least one high pressure accumulator (16; 16', 16''), the control unit (22) for regulating an injection pressure (p_r) prevailing in the high pressure accumulator (16; 16', 16''), and fuel injection valves (9) for injecting fuel from the high pressure accumulator (16; 16', 16") into combustion chambers (4) of the internal combustion engine (1), the fuel metering system (11) having a fuel circuit for metering fuel into all of the combustion chambers (4) of the internal combustion engine (1), all of the high pressure pumps (14, 15) being arranged in the fuel circuit, and the control unit (22) actuating all of the high pressure pumps (14, 15) independently of one another by means of a common pressure regulating circuit, characterized in that the control unit has a control element according to Claim 11.
EP01947132A 2000-05-11 2001-05-08 Method for the operation of a fuel metering system on a direct injection internal combustion engine Expired - Lifetime EP1282771B1 (en)

Applications Claiming Priority (3)

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DE10023033 2000-05-11
DE10023033A DE10023033A1 (en) 2000-05-11 2000-05-11 Operation of fuel metering system of direct injection engine, places all high pressure pumps in fuel circuit, with common pressure control system
PCT/DE2001/001720 WO2001086139A1 (en) 2000-05-11 2001-05-08 Method for the operation of a fuel metering system on a direct injection internal combustion engine

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EP1282771B1 true EP1282771B1 (en) 2007-04-04

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WO2001086139A1 (en) 2001-11-15
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DE50112290D1 (en) 2007-05-16
US6823844B2 (en) 2004-11-30
US20020162536A1 (en) 2002-11-07
EP1282771A1 (en) 2003-02-12

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