WO2012089371A1 - Injection pump for a fuel injection system - Google Patents
Injection pump for a fuel injection system Download PDFInfo
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- WO2012089371A1 WO2012089371A1 PCT/EP2011/069347 EP2011069347W WO2012089371A1 WO 2012089371 A1 WO2012089371 A1 WO 2012089371A1 EP 2011069347 W EP2011069347 W EP 2011069347W WO 2012089371 A1 WO2012089371 A1 WO 2012089371A1
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- Prior art keywords
- injection pump
- pressure
- injection
- pump
- control device
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Classifications
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- 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
- F02M63/0265—Pumps feeding common rails
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- 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
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/005—Pressure relief valves
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- 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
- F02M63/023—Means for varying pressure in common rails
- F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
- F02M63/0245—Means for varying pressure in common rails by bleeding fuel pressure between the high pressure pump and the common rail
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- 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
- F02M63/028—Returnless common rail system
Definitions
- the invention relates to an injection pump for a fuel injection system of an internal combustion engine. Furthermore, the invention relates to a fuel injection system with such an injection pump and to a method for providing a regulated pressure for an electronic injection device of an internal combustion engine.
- the pressure is generated by means of a so-called high-pressure or injection pump, which is mechanically driven by the internal combustion engine or engine in known fuel injection systems.
- An electromechanical quantity control valve controls the quantity of fuel delivered by the injection pump per unit of time into a high-pressure region, a so-called rail.
- Electromagnetic injection valves are connected to the rail as an electronic injection device, by means of which the fuel is injected under high pressure at the associated engine.
- an engine control unit regulates the pressure in the high-pressure range to the desired level. The control of the injectors is carried out on the basis of the measured with the high pressure sensor on the rail pressure signal.
- the aim of the present invention is to make such fuel injection systems for the same or almost the same function cheaper. Disclosure of the invention
- an injection pump for a fuel injection system of an internal combustion engine is provided with a mechanical pressure control device which is adapted to cooperate with an electronic injection device on the internal combustion engine.
- a mechanically controlled injection pump is combined with a modern electronic high-pressure injection. Due to this design, the otherwise required quantity control valve, an otherwise required electric power amplifier in an associated control unit, otherwise required cable in the wiring harness and preferably also the otherwise required pressure sensor in the high pressure area omitted. This considerably reduces the manufacturing costs of the system according to the invention.
- the electronic high-pressure injection and the injection strategies developed for it can be reused. This makes it possible to comply with today's requirements regarding permissible pollutant emissions and fuel consumption as well as carbon dioxide emissions.
- the low-pressure system of the fuel injection system according to the invention is essentially unchanged compared to known systems.
- the injection pump according to the invention is preferably mechanically driven, whereby a total also particularly cost-effective solution is possible.
- the injection pump is preferably driven by a camshaft of the associated engine.
- the mechanical pressure control device is particularly advantageous combined with the injection pump to a pump module.
- the pressure generation by means of the injection pump and the pressure control in a single united together.
- the installation space can be kept small and overall the pump can be made self-sufficient with your control, so that it can be largely freely installed with regard to your installation position and its connections.
- the mechanical pressure control device is preferably designed with a pressure relief.
- the pressure control device is designed as a piston valve with a sliding piston via a control slot.
- the piston is preferably biased by means of a spring, in particular a helical spring, so that it only moves over the control slot when a setpoint control pressure is reached. The piston then releases there an area over which the pressurized fuel can flow into the low-pressure region.
- the mechanical pressure control device is preferably designed with a fixed or constant suction throttle.
- a throttle is provided on the suction side of the injection pump, in particular at its inlet.
- the throttle is used to reduce the per unit time flowing to the injection pump Kraftstoff,. Fluid quantity and only comes into effect when the amount of fluid per unit time is so great that at the throttle even creates a throttle effect.
- the throttle is not yet effective.
- the arrangement of the throttle before the injection pump so the amount of fuel is effectively limited only at high engine and thus pump speeds. In particular, the pump delivery in cold start, at low speeds, however, remains virtually unaffected.
- the combination of the injection pump with an input-side throttle is particularly useful because the injection pumps usually have to be designed for the necessary cold start amount and are oversized in warm operation at higher speeds.
- the suction throttling is variable, preferably designed as a spring-loaded spool valve with control slot, which is hydraulically coupled to the pump outlet designed.
- the mechanical pressure control device is further designed with a piston stroke variation.
- the injection pump is set up so that the stroke of the associated piston or can be changed or varied during operation, so that the injection pump is a per Time unit provides changed flow rate.
- overpressure protection is also advantageously provided.
- the overpressure or pressure limiting function is particularly advantageous when e.g. In a reheating phase of the associated engine, there is a heating of the fuel and thus an increase in pressure in the fuel injection system.
- the overpressure protection reliably prevents such an increase in pressure in the so-called hot peak, in that the fuel is diverted from the pressure side of the pump into the low pressure region as the pressure rises via the overpressure safety device.
- a fuel injection system is also provided with such an injection pump.
- a damper is preferably coupled to a low-pressure side of the injection pump.
- a non-return valve blocking in the direction of the injection pump is preferably provided, in order to avoid an excessive pressure drop in the high-pressure region due to residual leakage in the low-pressure region.
- FIG. 1 shows a hydraulic diagram of an embodiment of a fuel injection system according to the invention.
- a fuel injection system 10 of a further not illustrated internal combustion engine is shown in which liquid fuel, in this case gasoline, is conveyed from a tank 12 by means of an electric fuel pump 14 through a filter 16 in a conduit 18.
- liquid fuel in this case gasoline
- a filter 16 in a conduit 18.
- a low-pressure accumulator or damper 20 is optionally connected.
- the line 18 is located on the suction side of a high-pressure pump designed injection pump 22, in the pressure chamber 24 a designed as a check valve inlet valve 26 leads into it.
- the pressure chamber 24 of the pump 22 is variable in its volume by means of a pump piston 30 mounted in a pump housing 28. From the pressure chamber 24, a line 32 leads through a likewise designed as a check valve outlet valve 34 in a high-pressure region forming rail 36. On the rail 36 are arranged as electronic or electronically controlled injection four electromagnetic high-pressure injectors 38, by means of which under high pressure Provided fuel can be injected to the internal combustion engine.
- the injection pump 22 is provided with a mechanical pressure control device 40, which is adapted to cooperate with the acting as an electronic injection high pressure injectors 38 on the internal combustion engine.
- the injection pump 22 is mechanically driven directly by a camshaft 42 of the internal combustion engine. It is combined with the pressure control device 40, in particular in a single housing, to form a pump module. Alternatively or additionally, the inlet valve 26, the outlet valve 34 and / or the damper 20 are arranged in this pump module or pump housing 28.
- the mechanical pressure control device 40 has a pressure relief, which regulates the pressure in the line 32 and the rail 36 to a dependent of the rotational speed of the injection pump 22 operating pressure.
- the mechanical pressure control device 40 is designed with a suction throttling, which is not further illustrated in detail, in the form of an orifice plate, which is formed on the suction side of the injection pump 22, ie on the line 18.
- injection pump 22 is alternatively designed so that the stroke of your pump piston 30 can be varied in operation by means of the mechanical pressure control device 40.
- the control of the electronically controlled high-pressure injection valves 38 determines the pressure applied to the rail 36 not by means of a pressure sensor, but by means of a pressure model of the mechanical pressure control device 40.
- the control estimates depending on the operating point of the injection pump 22 based on the pressure model from which pressure the pressure control device 40 has adjusted and controls the high-pressure Einspitzventile 38 accordingly.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Beschreibung Titel Description title
Einspritzpumpe für ein Kraftstoffeinspritzsvstem Stand der Technik Injection pump for a Kraftstoffeinspritzsvstem prior art
Die Erfindung betrifft eine Einspritzpumpe für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine. Ferner betrifft die Erfindung ein Kraftstoffeinspritzsystem mit einer derartigen Einspritzpumpe und ein Verfahren zum Bereitstellen eines gere- gelten Drucks für eine elektronische Einspritzeinrichtung einer Brennkraftmaschine. The invention relates to an injection pump for a fuel injection system of an internal combustion engine. Furthermore, the invention relates to a fuel injection system with such an injection pump and to a method for providing a regulated pressure for an electronic injection device of an internal combustion engine.
Heutige Kraftstoffeinspritzsysteme von Brennkraftmaschinen bzw. Verbrennungsmotoren, insbesondere bei Ottomotoren, arbeiten als so genannte Direkt- einspritzung (DI) mit Einspritzdrücken von bis zu 200 bar. Der Druck wird mittels einer so genannten Hochdruck- bzw. Einspritzpumpe erzeugt, die bei bekannten Kraftstoffeinspritzsystemen mechanisch vom Verbrennungsmotor bzw. Motor angetrieben wird. Ein elektromechanisches Mengensteuerventil steuert die von der Einspritzpumpe pro Zeiteinheit in einen Hochdruckbereich, ein so genanntes Rail, geförderte Kraftstoffmenge. Am Rail sind als elektronische Einspritzeinrichtung elektromagnetische Einspritzventile angeschlossen, mittels denen der Kraftstoff unter Hochdruck am zugehörigen Motor eingespritzt wird. Zusammen mit einem Hochdrucksensor und dem elektromechanischen Mengensteuerventil regelt ein Motor-Steuergerät den Druck im Hochdruckbereich auf das gewünschte Niveau. Die Ansteuerung der Einspritzventile erfolgt dabei auf der Basis des mit dem Hochdrucksensor am Rail gemessenen Drucksignals. Today's fuel injection systems of internal combustion engines or internal combustion engines, in particular in gasoline engines, operate as so-called direct injection (DI) with injection pressures of up to 200 bar. The pressure is generated by means of a so-called high-pressure or injection pump, which is mechanically driven by the internal combustion engine or engine in known fuel injection systems. An electromechanical quantity control valve controls the quantity of fuel delivered by the injection pump per unit of time into a high-pressure region, a so-called rail. Electromagnetic injection valves are connected to the rail as an electronic injection device, by means of which the fuel is injected under high pressure at the associated engine. Together with a high-pressure sensor and the electromechanical volume control valve, an engine control unit regulates the pressure in the high-pressure range to the desired level. The control of the injectors is carried out on the basis of the measured with the high pressure sensor on the rail pressure signal.
Ziel der vorliegenden Erfindung ist es derartige Kraftstoffeinspritzsysteme bei gleicher oder nahezu gleicher Funktion kostengünstiger zu gestalten. Offenbarung der Erfindung The aim of the present invention is to make such fuel injection systems for the same or almost the same function cheaper. Disclosure of the invention
Erfindungsgemäß ist eine Einspritzpumpe für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine mit einer mechanischen Druckregeleinrichtung versehen, die dazu angepasst ist, mit einer elektronischen Einspritzeinrichtung an der Brennkraftmaschine zusammenzuwirken. According to the invention, an injection pump for a fuel injection system of an internal combustion engine is provided with a mechanical pressure control device which is adapted to cooperate with an electronic injection device on the internal combustion engine.
Gemäß der Erfindung ist eine mechanisch geregelte Einspritzpumpe mit einer modernen elektronischen Hochdruck-Einspritzung kombiniert. Aufgrund dieser Gestaltung können das sonst erforderliche Mengensteuerventil, eine sonst erforderliche elektrische Endstufe in einem zugehörigen Steuergerät, sonst erforderliche Kabel im Kabelbaum und vorzugsweise auch der sonst erforderliche Drucksensor am Hochdruckbereich entfallen. Dies senkt die Herstellungskosten des erfindungsgemäßen Systems erheblich. According to the invention, a mechanically controlled injection pump is combined with a modern electronic high-pressure injection. Due to this design, the otherwise required quantity control valve, an otherwise required electric power amplifier in an associated control unit, otherwise required cable in the wiring harness and preferably also the otherwise required pressure sensor in the high pressure area omitted. This considerably reduces the manufacturing costs of the system according to the invention.
Durch den Entfall der genannten elektrischen Komponenten reduziert sich auch der Verbrauch an elektrischer Energie des Systems und damit ergibt sich ein insgesamt geringerer Kraftstoffverbrauch. The elimination of said electrical components also reduces the consumption of electrical energy of the system and thus results in an overall lower fuel consumption.
Zugleich können im Vergleich zu rein mechanischen Hochdruck- Kraftstoffeinspritzsystemen die elektronische Hochdruck-Einspritzung und die dafür entwickelten Einspritz-Strategien weiterverwendet werden. Damit ist es möglich, die heutigen Vorgaben bezüglich der zulässigen Schadstoffemissionen und des Kraftstoffverbrauchs sowie des Kohlendioxid-Ausstoßes einzuhalten. At the same time, compared to purely mechanical high-pressure fuel injection systems, the electronic high-pressure injection and the injection strategies developed for it can be reused. This makes it possible to comply with today's requirements regarding permissible pollutant emissions and fuel consumption as well as carbon dioxide emissions.
Das Niederdrucksystem der erfindungsgemäßen Kraftstoffeinspritzanlage ist im Wesentlichen gegenüber bekannten Systeme unverändert. The low-pressure system of the fuel injection system according to the invention is essentially unchanged compared to known systems.
Die erfindungsgemäße Einspritzpumpe ist bevorzugt mechanisch angetrieben, wodurch eine ebenfalls insgesamt besonders kostengünstige Lösung möglich ist. Die Einspritzpumpe wird dabei vorzugsweise von einer Nockenwelle des zugehörigen Motors angetrieben. The injection pump according to the invention is preferably mechanically driven, whereby a total also particularly cost-effective solution is possible. The injection pump is preferably driven by a camshaft of the associated engine.
Die mechanische Druckregeleinrichtung ist besonders vorteilhaft mit der Einspritzpumpe zu einem Pumpenmodul kombiniert. Vorzugsweise wird also die Druckerzeugung mittels der Einspritzpumpe und die Druckregelung in einer Ein- heit zusammengeführt. Dadurch kann der Bauraum klein gehalten werden und insgesamt die Pumpe mit Ihrer Regelung autark gestaltet werden, so dass Sie im Hinblick auf Ihre Einbaulage und ihre Anschlüsse weitgehend frei verbaut werden kann. The mechanical pressure control device is particularly advantageous combined with the injection pump to a pump module. Preferably, therefore, the pressure generation by means of the injection pump and the pressure control in a single united together. As a result, the installation space can be kept small and overall the pump can be made self-sufficient with your control, so that it can be largely freely installed with regard to your installation position and its connections.
Die mechanische Druckregeleinrichtung ist bevorzugt mit einer Druckabsteuerung gestaltet. Besonders bevorzugt ist die Druckregeleinrichtung als Kolbenschieberventil mit einem über einen Steuerschlitz verschiebbaren Kolben gestaltet. Der Kolben ist dabei bevorzugt mittels einer Feder, insbesondere einer Schraubenfeder, vorgespannt, so dass er sich erst bei Erreichen eines Sollregeldrucks über den Steuerschlitz bewegt. Der Kolben gibt dann dort eine Fläche frei, über die der unter Druck stehende Kraftstoff in den Niederdruckbereich abströmen kann. The mechanical pressure control device is preferably designed with a pressure relief. Particularly preferably, the pressure control device is designed as a piston valve with a sliding piston via a control slot. The piston is preferably biased by means of a spring, in particular a helical spring, so that it only moves over the control slot when a setpoint control pressure is reached. The piston then releases there an area over which the pressurized fuel can flow into the low-pressure region.
Die mechanische Druckregeleinrichtung ist vorzugsweise mit einer festen bzw. konstanten Saugdrosselung gestaltet. Dabei ist saugseitig von der Einspritzpumpe, insbesondere an deren Einlass, eine Drossel vorgesehen. Die Drossel dient zum Reduzieren der pro Zeiteinheit zur Einspritzpumpe fließenden Kraftstoffbzw. Fluidmenge und kommt erst zur Geltung, wenn die Fluidmenge pro Zeiteinheit derart groß ist, dass an der Drossel überhaupt eine Drosselwirkung entsteht. Bei kleiner Pumpendrehzahl und damit kleiner Fördermenge kommt die Drossel hingegen noch nicht zur Geltung. Durch die Anordnung der Drossel vor der Einspritzpumpe wird also die Kraftstoffmenge nur bei hohen Motor- und damit Pumpendrehzahlen wirksam begrenzt. Gerade die Pumpenförderung im Kaltstart, bei geringen Drehzahlen, bleibt hingegen praktisch unbeeinflusst. Die Kombination der Einspritzpumpe mit einer eingangsseitigen Drossel ist insbesondere sinnvoll, weil die Einspritzpumpen in der Regel auf die notwendige Kaltstartmenge ausgelegt sein müssen und dadurch im warmen Betrieb bei höheren Drehzahlen überdimensioniert sind. Alternativ oder zusätzlich ist die Saugdrosselung variabel, bevorzugt als federbelastetes Kolbenschieberventil mit Steuerschlitz, welches hydraulisch mit dem Pumpenausgang gekoppelt ist, gestaltet. The mechanical pressure control device is preferably designed with a fixed or constant suction throttle. In this case, a throttle is provided on the suction side of the injection pump, in particular at its inlet. The throttle is used to reduce the per unit time flowing to the injection pump Kraftstoffbzw. Fluid quantity and only comes into effect when the amount of fluid per unit time is so great that at the throttle even creates a throttle effect. At low pump speed and thus small flow, however, the throttle is not yet effective. The arrangement of the throttle before the injection pump so the amount of fuel is effectively limited only at high engine and thus pump speeds. In particular, the pump delivery in cold start, at low speeds, however, remains virtually unaffected. The combination of the injection pump with an input-side throttle is particularly useful because the injection pumps usually have to be designed for the necessary cold start amount and are oversized in warm operation at higher speeds. Alternatively or additionally, the suction throttling is variable, preferably designed as a spring-loaded spool valve with control slot, which is hydraulically coupled to the pump outlet designed.
Alternativ oder zusätzlich ist ferner die mechanische Druckregeleinrichtung mit einer Kolbenhubvariierung gestaltet. Bei dieser Ausgestaltung ist die Einspritz- pumpe dazu eingerichtet, dass der Hub des bzw. der zugehörigen Kolben im Betrieb verändert bzw. variiert werden kann, so dass die Einspritzpumpe eine pro Zeiteinheit veränderte Fördermenge liefert. Alternatively or additionally, the mechanical pressure control device is further designed with a piston stroke variation. In this embodiment, the injection pump is set up so that the stroke of the associated piston or can be changed or varied during operation, so that the injection pump is a per Time unit provides changed flow rate.
Mit der mechanischen Druckregeleinrichtung ist darüber hinaus vorteilhaft eine Überdrucksicherung geschaffen. Die Überdrucksicherung bzw. Druckbegren- zungsfunktion ist insbesondere vorteilhaft, wenn z.B. in einer Nachheizphase des zugehörigen Motors es zu einer Erwärmung des Kraftstoffs und damit zu einem Druckanstieg im Kraftstoffeinspritzsystem kommt. Die Überdrucksicherung verhindert sicher eine derartige Druckerhöhung im so genannten Hot-Peak, indem der Kraftstoff bei steigendem Druck über die Überdrucksicherung von der Druck- seite der Pumpe in den Niederdruckbereich abgesteuert wird. With the mechanical pressure control device, overpressure protection is also advantageously provided. The overpressure or pressure limiting function is particularly advantageous when e.g. In a reheating phase of the associated engine, there is a heating of the fuel and thus an increase in pressure in the fuel injection system. The overpressure protection reliably prevents such an increase in pressure in the so-called hot peak, in that the fuel is diverted from the pressure side of the pump into the low pressure region as the pressure rises via the overpressure safety device.
Falls das Druckregelkonzept bereits einen übermäßigen Druckanstieg im Rail sicher vermeidet, kann auf ein sonst optional vorzusehendes Druckbegrenzungsventil am Hochdruckbereich verzichtet werden. If the pressure control concept already reliably avoids an excessive rise in pressure in the rail, it is possible to dispense with an otherwise optionally provided pressure relief valve at the high-pressure region.
Erfindungsgemäß ist ferner ein Kraftstoffeinspritzsystem mit einer derartigen Einspritzpumpe geschaffen. Bei dem Kraftstoffeinspritzsystem ist bevorzugt an einer Niederdruckseite der Einspritzpumpe ein Dämpfer angekoppelt. Vor allem bei Einspritzpumpen, die mit einem hin und her bewegbaren Kolben bzw. als Kol- benpumpen, also mit diskontinuierlicher Förderung, arbeiten, ist ein solcherAccording to the invention, a fuel injection system is also provided with such an injection pump. In the fuel injection system, a damper is preferably coupled to a low-pressure side of the injection pump. Especially with injection pumps that work with a reciprocating piston or piston pumps, ie with discontinuous promotion, is one such
Dämpfer vorteilhaft. Damper advantageous.
An einer Hochdruckseite der Einspritzpumpe ist vorzugsweise ein in Richtung der Einspritzpumpe sperrendes Rückschlagventil vorgesehen, um einen übermäßi- gen Druckabfall im Hochdruckbereich aufgrund von Restleckage im Niederruckbereich zu vermeiden. Bei einer Kolbenpumpe als Einspritzpumpe kann diese Funktion bereits durch das Auslassventil der Kolbenpumpe übernommen werden. Erfindungsgemäß ist ferner ein Verfahren zum Bereitstellen eines geregeltenOn a high-pressure side of the injection pump, a non-return valve blocking in the direction of the injection pump is preferably provided, in order to avoid an excessive pressure drop in the high-pressure region due to residual leakage in the low-pressure region. With a piston pump as an injection pump, this function can already be taken over by the outlet valve of the piston pump. The invention further provides a method for providing a controlled
Drucks für eine elektronische Einspritzeinrichtung einer Brennkraftmaschine mittels einer Einspritzpumpe und einer mit dieser gekoppelten mechanischen Druckregeleinrichtung geschaffen, bei dem die elektronische Einspritzeinrichtung den real anliegenden Druck mittels eines Druckmodells der mechanischen Druckre- geleinrichtung ermittelt. Durch die Verwendung einer mechanischen Druckregeleinrichtung kann das Kraftstoffeinspritzsystem stark vereinfacht werden und durch die Verwendung eines Druckmodels der mechanischen Druckregeleinrichtung kann ferner auf einen sonst notwendigen Drucksensor nebst dessen Verkabelung und Auswertung in einem Steuergerät verzichtet werden. Nachfolgend wird ein Ausführungsbeispiel der erfindungsgemäßen Lösung anhand der beigefügten schematischen Zeichnung näher erläutert. Pressure for an electronic injector of an internal combustion engine by means of an injection pump and a coupled thereto mechanical pressure control device, in which the electronic injection device determines the real pressure applied by means of a pressure model of the mechanical Druckre- gel device. By using a mechanical pressure control device, the fuel injection system can be greatly simplified and by the use of a pressure model of the mechanical pressure control device can also be dispensed with an otherwise necessary pressure sensor together with its wiring and evaluation in a control unit. An embodiment of the solution according to the invention is explained in more detail below with reference to the attached schematic drawing.
Es zeigt die Fig. 1 ein hydraulisches Schaubild eines Ausführungsbeispiels eines erfindungsgemäßen Kraftstoffeinspritzsystems. 1 shows a hydraulic diagram of an embodiment of a fuel injection system according to the invention.
In Fig. 1 ist ein Kraftstoffeinspritzsystem 10 einer weiter nicht veranschaulichten Brennkraftmaschine dargestellt, bei dem flüssiger Kraftstoff, vorliegend Benzin, aus einem Tank 12 mittels einer elektrischen Kraftstoffpumpe 14 durch einen Filter 16 in eine Leitung 18 gefördert wird. An der Leitung 18 ist optional ein Nieder- druckspeicher bzw. Dämpfer 20 angeschlossen. In Fig. 1, a fuel injection system 10 of a further not illustrated internal combustion engine is shown in which liquid fuel, in this case gasoline, is conveyed from a tank 12 by means of an electric fuel pump 14 through a filter 16 in a conduit 18. On the line 18, a low-pressure accumulator or damper 20 is optionally connected.
Die Leitung 18 befindet sich an der Saugseite einer als Hochdruckpumpe gestalteten Einspritzpumpe 22, in deren Druckraum 24 ein als Rückschlagventil gestaltetes Einlassventil 26 hineinführt. Der Druckraum 24 der Pumpe 22 ist mittels ei- nes in einem Pumpengehäuse 28 gelagerten Pumpenkolbens 30 in seinem Volumen veränderbar. Aus dem Druckraum 24 führt eine Leitung 32 durch ein ebenfalls als Rückschlagventil gestaltetes Auslassventil 34 in ein einen Hochdruckbereich bildendes Rail 36. An dem Rail 36 sind als elektronische bzw. elektronisch gesteuerte Einspritzeinrichtung vier elektromagnetische Hochdruck-Einspritzventile 38 angeordnet, mittels denen der derart unter Hochdruck bereitgestellte Kraftstoff an der Brennkraftmaschine eingespritzt werden kann. Die Einspritzpumpe 22 ist mit einer mechanischen Druckregeleinrichtung 40 versehen, die dazu angepasst ist, mit den als elektronische Einspritzeinrichtung wirkenden Hochdruck-Einspritzventilen 38 an der Brennkraftmaschine zusammenzuwirken. Die Einspritzpumpe 22 wird dabei direkt von einer Nockenwelle 42 der Brennkraftmaschine mechanisch angetrieben. Sie ist zusammen mit der Druck- regeleinrichtung 40, insbesondere in einem einzigen Gehäuse, zu einem Pumpenmodul kombiniert. Alternativ oder zusätzlich sind auch das Einlassventil 26, das Auslassventil 34 und/oder der Dämpfer 20 in diesem Pumpenmodul bzw. Pumpengehäuse 28 angeordnet. The line 18 is located on the suction side of a high-pressure pump designed injection pump 22, in the pressure chamber 24 a designed as a check valve inlet valve 26 leads into it. The pressure chamber 24 of the pump 22 is variable in its volume by means of a pump piston 30 mounted in a pump housing 28. From the pressure chamber 24, a line 32 leads through a likewise designed as a check valve outlet valve 34 in a high-pressure region forming rail 36. On the rail 36 are arranged as electronic or electronically controlled injection four electromagnetic high-pressure injectors 38, by means of which under high pressure Provided fuel can be injected to the internal combustion engine. The injection pump 22 is provided with a mechanical pressure control device 40, which is adapted to cooperate with the acting as an electronic injection high pressure injectors 38 on the internal combustion engine. The injection pump 22 is mechanically driven directly by a camshaft 42 of the internal combustion engine. It is combined with the pressure control device 40, in particular in a single housing, to form a pump module. Alternatively or additionally, the inlet valve 26, the outlet valve 34 and / or the damper 20 are arranged in this pump module or pump housing 28.
Die mechanische Druckregeleinrichtung 40 weist eine Druckabsteuerung auf, die den Druck in der Leitung 32 sowie dem Rail 36 auf einen von der Drehzahl der Einspritzpumpe 22 abhängigen Betriebsdruck einregelt. Dabei ist die mechanische Druckregeleinrichtung 40 mit einer weiter nicht im Detail veranschaulichten Saugdrosselung in Gestalt einer Drosselscheibe gestaltet, welche an der Saugseite der Einspritzpumpe 22, also an der Leitung 18, ausgebildet ist. The mechanical pressure control device 40 has a pressure relief, which regulates the pressure in the line 32 and the rail 36 to a dependent of the rotational speed of the injection pump 22 operating pressure. In this case, the mechanical pressure control device 40 is designed with a suction throttling, which is not further illustrated in detail, in the form of an orifice plate, which is formed on the suction side of the injection pump 22, ie on the line 18.
Darüber hinaus ist die Einspritzpumpe 22 alternativ so gestaltet, dass der Hub Ihres Pumpenkolbens 30 im Betrieb mittels der mechanischen Druckregeleinrichtung 40 variiert werden kann. In addition, the injection pump 22 is alternatively designed so that the stroke of your pump piston 30 can be varied in operation by means of the mechanical pressure control device 40.
Dabei ermittelt die Steuerung der elektronisch gesteuerten Hochdruck- Einspritzventile 38 den am Rail 36 anliegenden Druck nicht mittels eines Drucksensors, sondern mittels eines Druckmodells der mechanischen Druckregeleinrichtung 40. Die Steuerung schätzt in Abhängigkeit des Betriebspunkts der Einspritzpumpe 22 anhand des Druckmodels ab, welchen Druck die Druckregeleinrichtung 40 eingestellt haben wird und regelt entsprechend die Hochdruck- Einspitzventile 38. The control of the electronically controlled high-pressure injection valves 38 determines the pressure applied to the rail 36 not by means of a pressure sensor, but by means of a pressure model of the mechanical pressure control device 40. The control estimates depending on the operating point of the injection pump 22 based on the pressure model from which pressure the pressure control device 40 has adjusted and controls the high-pressure Einspitzventile 38 accordingly.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010064221.5 | 2010-12-27 | ||
| DE201010064221 DE102010064221A1 (en) | 2010-12-27 | 2010-12-27 | Injection pump for a fuel injection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012089371A1 true WO2012089371A1 (en) | 2012-07-05 |
Family
ID=44906133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2011/069347 Ceased WO2012089371A1 (en) | 2010-12-27 | 2011-11-03 | Injection pump for a fuel injection system |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102010064221A1 (en) |
| WO (1) | WO2012089371A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2778341A1 (en) * | 2013-03-12 | 2014-09-17 | Pratt & Whitney Canada Corp. | Internal combustion engine with common rail pilot and main injection |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013208141A1 (en) | 2013-05-03 | 2014-11-06 | Robert Bosch Gmbh | Pump, in particular fuel pump |
| DE102013209760A1 (en) | 2013-05-27 | 2014-11-27 | Robert Bosch Gmbh | pump |
| DE102015213322A1 (en) | 2015-07-16 | 2017-01-19 | Robert Bosch Gmbh | Fuel injection system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10108202A1 (en) * | 2001-02-21 | 2002-08-22 | Bosch Gmbh Robert | Common rail for internal combustion engines comprises a mechanical/hydraulic pressure-reducing valve consisting of two valve units connected via a throttling port |
| EP1251266A1 (en) * | 2001-04-18 | 2002-10-23 | Robert Bosch Gmbh | Pressure limiting device and fuel system with such a pressure limiting device |
| WO2004048770A1 (en) * | 2002-11-26 | 2004-06-10 | Robert Bosch Gmbh | Fuel injection device for an internal combustion engine |
| WO2005031161A2 (en) * | 2003-10-01 | 2005-04-07 | Robert Bosch Gmbh | Fluid pump particularly high-pressure fuel pump with pressure damper |
| WO2010049207A1 (en) * | 2008-10-28 | 2010-05-06 | Robert Bosch Gmbh | High-pressure fuel pump for an internal combustion engine |
| WO2010060834A1 (en) * | 2008-11-28 | 2010-06-03 | Continental Automotive Gmbh | High pressure pump |
-
2010
- 2010-12-27 DE DE201010064221 patent/DE102010064221A1/en not_active Ceased
-
2011
- 2011-11-03 WO PCT/EP2011/069347 patent/WO2012089371A1/en not_active Ceased
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10108202A1 (en) * | 2001-02-21 | 2002-08-22 | Bosch Gmbh Robert | Common rail for internal combustion engines comprises a mechanical/hydraulic pressure-reducing valve consisting of two valve units connected via a throttling port |
| EP1251266A1 (en) * | 2001-04-18 | 2002-10-23 | Robert Bosch Gmbh | Pressure limiting device and fuel system with such a pressure limiting device |
| WO2004048770A1 (en) * | 2002-11-26 | 2004-06-10 | Robert Bosch Gmbh | Fuel injection device for an internal combustion engine |
| WO2005031161A2 (en) * | 2003-10-01 | 2005-04-07 | Robert Bosch Gmbh | Fluid pump particularly high-pressure fuel pump with pressure damper |
| WO2010049207A1 (en) * | 2008-10-28 | 2010-05-06 | Robert Bosch Gmbh | High-pressure fuel pump for an internal combustion engine |
| WO2010060834A1 (en) * | 2008-11-28 | 2010-06-03 | Continental Automotive Gmbh | High pressure pump |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2778341A1 (en) * | 2013-03-12 | 2014-09-17 | Pratt & Whitney Canada Corp. | Internal combustion engine with common rail pilot and main injection |
| US9200563B2 (en) | 2013-03-12 | 2015-12-01 | Pratt & Whitney Canada Corp. | Internal combustion engine with common rail pilot and main injection |
| US9771860B2 (en) | 2013-03-12 | 2017-09-26 | Pratt & Whitney Canada Corp. | Internal combustion engine with common rail pilot and main injection |
| US9957885B2 (en) | 2013-03-12 | 2018-05-01 | Pratt & Whitney Canada Corp. | Internal combustion engine with common rail pilot and main injection |
| US10267217B2 (en) | 2013-03-12 | 2019-04-23 | Pratt & Whitney Canada Corp. | Internal combustion engine with common rail injection |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102010064221A1 (en) | 2012-06-28 |
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