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WO2012089371A1 - Pompe d'injection pour un système d'injection de carburant - Google Patents

Pompe d'injection pour un système d'injection de carburant Download PDF

Info

Publication number
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
Authority
WO
WIPO (PCT)
Prior art keywords
injection pump
pressure
injection
pump
control device
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.)
Ceased
Application number
PCT/EP2011/069347
Other languages
German (de)
English (en)
Inventor
Klaus Joos
Thorsten Allgeier
Andreas Roth
Peter Schenk
Alexander Schenck Zu Schweinsberg
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2012089371A1 publication Critical patent/WO2012089371A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F02M63/0265—Pumps feeding common rails
    • 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
    • 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
    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne une pompe d'injection (22) pour un système d'injection de carburant (10) d'un moteur à combustion interne, caractérisée en ce que la pompe d'injection (22) est pourvue d'un dispositif de régulation de pression mécanique (40) conçu pour interagir avec un dispositif d'injection électronique (38) sur le moteur à combustion interne. La pression réellement appliquée est déterminée au moyen d'un modèle de pression du dispositif de régulation de pression mécanique.
PCT/EP2011/069347 2010-12-27 2011-11-03 Pompe d'injection pour un système d'injection de carburant Ceased WO2012089371A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010064221.5 2010-12-27
DE201010064221 DE102010064221A1 (de) 2010-12-27 2010-12-27 Einspritzpumpe für ein Kraftstoffeinspritzsystem

Publications (1)

Publication Number Publication Date
WO2012089371A1 true WO2012089371A1 (fr) 2012-07-05

Family

ID=44906133

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/069347 Ceased WO2012089371A1 (fr) 2010-12-27 2011-11-03 Pompe d'injection pour un système d'injection de carburant

Country Status (2)

Country Link
DE (1) DE102010064221A1 (fr)
WO (1) WO2012089371A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2778341A1 (fr) * 2013-03-12 2014-09-17 Pratt & Whitney Canada Corp. Moteur à combustion interne à injection pilote et principale de rail commun

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013208141A1 (de) 2013-05-03 2014-11-06 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffpumpe
DE102013209760A1 (de) 2013-05-27 2014-11-27 Robert Bosch Gmbh Pumpe
DE102015213322A1 (de) 2015-07-16 2017-01-19 Robert Bosch Gmbh Kraftstoffeinspritzsystem

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10108202A1 (de) * 2001-02-21 2002-08-22 Bosch Gmbh Robert Speichereinspritzsystem (Common Rail) für Brennkraftmaschinen
EP1251266A1 (fr) * 2001-04-18 2002-10-23 Robert Bosch Gmbh Dispositif de limitation de pression et système de combustible avec tel dispositif de limitation de pression
WO2004048770A1 (fr) * 2002-11-26 2004-06-10 Robert Bosch Gmbh Systeme d'injection de carburant pour moteur a combustion interne
WO2005031161A2 (fr) * 2003-10-01 2005-04-07 Robert Bosch Gmbh Pompe a fluide, en particulier pompe a carburant haute pression
WO2010049207A1 (fr) * 2008-10-28 2010-05-06 Robert Bosch Gmbh Pompe haute pression à carburant pour un moteur à combustion interne
WO2010060834A1 (fr) * 2008-11-28 2010-06-03 Continental Automotive Gmbh Pompe haute pression

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10108202A1 (de) * 2001-02-21 2002-08-22 Bosch Gmbh Robert Speichereinspritzsystem (Common Rail) für Brennkraftmaschinen
EP1251266A1 (fr) * 2001-04-18 2002-10-23 Robert Bosch Gmbh Dispositif de limitation de pression et système de combustible avec tel dispositif de limitation de pression
WO2004048770A1 (fr) * 2002-11-26 2004-06-10 Robert Bosch Gmbh Systeme d'injection de carburant pour moteur a combustion interne
WO2005031161A2 (fr) * 2003-10-01 2005-04-07 Robert Bosch Gmbh Pompe a fluide, en particulier pompe a carburant haute pression
WO2010049207A1 (fr) * 2008-10-28 2010-05-06 Robert Bosch Gmbh Pompe haute pression à carburant pour un moteur à combustion interne
WO2010060834A1 (fr) * 2008-11-28 2010-06-03 Continental Automotive Gmbh Pompe haute pression

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2778341A1 (fr) * 2013-03-12 2014-09-17 Pratt & Whitney Canada Corp. Moteur à combustion interne à injection pilote et principale de rail commun
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 (de) 2012-06-28

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