WO2004048770A1 - Systeme d'injection de carburant pour moteur a combustion interne - Google Patents

Systeme d'injection de carburant pour moteur a combustion interne Download PDF

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Publication number
WO2004048770A1
WO2004048770A1 PCT/DE2003/002701 DE0302701W WO2004048770A1 WO 2004048770 A1 WO2004048770 A1 WO 2004048770A1 DE 0302701 W DE0302701 W DE 0302701W WO 2004048770 A1 WO2004048770 A1 WO 2004048770A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
pump
fuel
connection
fuel injection
Prior art date
Application number
PCT/DE2003/002701
Other languages
German (de)
English (en)
Inventor
Peter Schueler
Juergen Gross
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 WO2004048770A1 publication Critical patent/WO2004048770A1/fr

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
    • F02M63/023—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
    • F02M63/0012—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
    • F02M63/0205—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 for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • 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 invention is based on one
  • Fuel injection device for an internal combustion engine according to the preamble of claim 1.
  • Such a fuel injection device is known from DE 100 57 244 A. This
  • Fuel injection device has a high-pressure pump, through which fuel is delivered under high pressure into a reservoir.
  • a feed pump delivers fuel from a reservoir to the high-pressure pump.
  • the memory becomes fuel for injection at the
  • a fuel metering device is arranged between the feed pump and the high pressure pump, by means of which the inflow of fuel from the feed pump to the high pressure pump is limited in such a way that by the
  • High pressure pump delivers a predetermined amount of fuel into the memory and a predetermined pressure is generated in the memory. If a defect occurs in the fuel metering device, such that it constantly causes a large amount of fuel to flow to
  • the pressure in the accumulator can rise sharply.
  • the pressure limiting device will damage parts of the Avoided fuel injection device or the internal combustion engine by limiting the pressure and diverting fuel into the relief region.
  • the disadvantage here is that the high-pressure pump continuously delivers a large amount of fuel, which leads to a strong mechanical and thermal load on the fuel injection device.
  • the fuel injection device with the features according to claim 1 has the advantage that in the event of a defect in the fuel metering device, the pressure limiting device not only limits the pressure in the high-pressure region, but also interrupts or at least reduces the inflow of fuel from the feed pump to the high-pressure pump that the mechanical and thermal load on the fuel injection device is kept low. If the pressure limiting device only reduces the inflow of fuel from the feed pump to the high-pressure pump, emergency operation of the internal combustion engine is possible.
  • the embodiment according to claim 3 enables a safe opening of the pressure limiting device.
  • FIG. 2 shows a detail of the fuel injection device designated II in FIG. 1 in an enlarged representation with a valve member in a closed position
  • FIG. 3 shows the detail with the valve member in an open position.
  • Fuel injection device for an internal combustion engine for example, a motor vehicle shown.
  • the internal combustion engine is preferably a self-igniting internal combustion engine and has a plurality of cylinders.
  • the fuel injection device has a feed pump 10, through which fuel is conveyed from a reservoir 12 via a connection 13 to the suction side of a high-pressure pump 14.
  • the high-pressure pump 14 delivers fuel under high pressure via a connection 15 into a reservoir 16.
  • Injectors 18 arranged on the cylinders of the internal combustion engine are connected to the memory via hydraulic lines.
  • a control valve 20 is arranged on each injector 18, by means of which the injector 18 can be opened for a fuel injection or can be closed for ending a fuel injection.
  • the control valves 20 of the injectors 18 are connected to an electronic control device 22 and are actuated by this as a function of operating parameters of the internal combustion engine.
  • a pressure sensor 24 is arranged on the accumulator 16, by means of which the pressure in the accumulator 16 is detected and which is connected to the control device 22, which is thus supplied with a signal for the pressure prevailing in the accumulator 16.
  • the high-pressure pump 14 has one or more pump elements, each with a pump piston tightly guided in a cylinder bore, which is driven by a drive shaft, for example via an eccentric drive, in a lifting movement. During the suction stroke, the respective pump piston sucks fuel and during the delivery stroke, the respective pump piston displaces fuel into the accumulator 16.
  • a fuel metering device 30 is arranged in the connection 13 of the feed pump 10 to the suction side of the high pressure pump 14, by means of which the inflow of fuel from the feed pump 10 to the high pressure pump 14 can be adjusted.
  • the fuel metering device 30 has a control valve 32, by means of which a flow cross section between the feed pump 10 and the high-pressure pump 14 can be variably adjusted, and an electrically controlled actuator 34 for actuating the control valve 32.
  • the actuator 34 can be an electromagnet or a piezo actuator and is controlled by the control device 22.
  • a control map for the pressure required in the memory 16 depending on operating parameters of the internal combustion engine, such as the speed of the load, temperature and, if appropriate, further operating parameters, is stored in the control device 22. Through the control device 22, the
  • Fuel metering device 30 is controlled in such a way that the inflow of fuel from the feed pump 10 to the high-pressure pump 14 is adjusted such that the high-pressure pump 14 delivers a quantity of fuel into the accumulator 16 that is required to generate the predetermined pressure in the accumulator 16.
  • the actual pressure in the memory 16 is detected by the control device 22 by means of the pressure sensor 24. If the actual pressure in the accumulator is lower than the predetermined pressure, the fuel metering device 30 is controlled by the control device 22 in such a way that the control valve 32 is one Releases larger flow cross-section and correspondingly more fuel is delivered by the high pressure pump 14, so that the pressure in the accumulator 16 increases.
  • the fuel metering device 30 is controlled by the control device 22 such that the control valve 32 releases a smaller flow cross section and correspondingly less fuel is delivered by the high-pressure pump 14, so that the pressure in the Memory 16 drops.
  • the high-pressure pump 14 has a housing 36 in which the fuel metering device 30 can be arranged and on which the feed pump 10 can be arranged.
  • the connection 13 from the feed pump 10 via the fuel metering device 30 to the high-pressure pump 14 takes place, for example, via a channel 40 in the housing 36 of the high-pressure pump 14, which can be designed as a bore made in the housing 36.
  • the connection 15 of the high-pressure pump 14 to the accumulator 16 also takes place, for example, via a channel 42 in the housing 36 of the high-pressure pump 14, which can be designed as a bore made in the housing 36.
  • a pressure limiting device 44 is provided, through which the high pressure area after the high pressure pump 14, that is
  • Channel 42 can be connected to a relief area when a predetermined pressure is exceeded, wherein the connection 13 between the feed pump 10 and the high pressure pump 14, in particular the channel 40, can serve as the relief area.
  • a bore 46 is formed in the housing 36, which opens into the channel 40 at one end and into the channel 42 at its other end.
  • the diameter of the bore 46 is stepped several times and points at the channel 42 in the High-pressure region opening end region 46a a small diameter.
  • a central region 46b of the bore 46 with a larger diameter adjoins the end region 46a.
  • the transition from the end region 46a to the central region 46b of the bore 46 can be approximately conical, for example, and forms a valve seat 48.
  • the central region 46b of the bore 46 is adjoined by its end region 46c which opens into the channel 40 and which is opposite the central region 46b has a larger diameter.
  • the end region 46c of the bore 46 continues on the other side of the channel 40 and ends as a blind bore in the housing 36.
  • a channel 50 opens at its periphery, which runs through the housing 36 and into the Channel 40 opens upstream of the end region 46c of the bore 46.
  • the pressure limiting device 44 has a valve member 52 which is displaceably arranged in the bore 46.
  • the valve member 52 has a closing member 54 which interacts with the valve seat 48 and which can be designed, for example, as a ball.
  • the valve member 52 also has a push rod 56 adjoining the closing member 54, which is tightly guided in the central region 46b of the bore 46.
  • the valve member 52 also has a piston 58 which adjoins the push rod 56 and is displaceably guided in the end region 46c of the bore 46.
  • a compression spring 60 is clamped between the piston 58 and the base of the end region 46c of the bore 46, by means of which the valve member 52 is pressed with its closing member 54 toward the valve seat 48.
  • the piston 58 has at least one passage 62 connecting its two end faces, which can be designed as a bore or groove in the piston 58.
  • Valve seat 48 abuts, so covers the push rod 56 the mouth of the channel 50 at the circumference of the central region 46b of the bore 46 .
  • ied 54 of the valve member 52 the channel 42 in the high pressure area is thus separated from the channel 40 in the relief area. In this closed position, the valve member 52 is
  • Pressure limiting device 44 when the pressure in the channel 42 and thus in the high-pressure area is below a predetermined value and the pressure on the closing member 54 on its surface within the valve seat 48 produces a lower force than the force of the compression spring 60
  • valve member 52 In this closed position, the valve member 52 is shown in Figure 2.
  • the pressure in the channel 42 exceeds the predetermined pressure
  • the force generated by the pressure on the closing member 54 becomes greater than the force of the compression spring 60 so that the valve member 52 moves in the opening direction. If the closing member 54 lifts off from the valve seat 48, a greater area is acted upon by the pressure prevailing in the channel 42 than when the valve member 54 abuts the valve seat 48, as a result of which a rapid opening movement of the valve member 52 is achieved.
  • the push rod 56 then releases the mouth of the channel 50 into the central region of the bore 46b, so that the
  • High pressure pump 14 is then no longer fuel or only a reduced amount of fuel. This will damage parts of the
  • valve member 52 is shown in Figure 3.
  • the flow cross section in the channel 40 is completely closed by the piston 58 of the valve member 52 of the pressure limiting device 44, then no further operation of the internal combustion engine is possible. If a reduced flow cross-section in the channel 40 is released by the piston 58 in the open position of the valve member 52, emergency operation of the internal combustion engine is made possible, so that the motor vehicle can still reach a workshop on its own.
  • a reduced flow cross section can be achieved, for example, by deliberate leakage between the piston 58 and the channel 40.
  • the diameter of the piston 58 can be somewhat smaller than the diameter of the channel 40.
  • the piston 58 can also have at least one passage, for example in the form of a transverse bore 64 with a small diameter, which forms the reduced flow cross-section.
  • valve member 52 Only then valve member 52 from its open position again moves into its closed position when the pressure in the channel 42 has dropped significantly below the predetermined pressure that is required to open the pressure limiting device 44. This prevents the pressure-limiting device 44 from repeatedly opening and closing in the case of slight pressure fluctuations in the high-pressure region 42.

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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

La présente invention concerne un système d'injection de carburant présentant une pompe haute pression (14) grâce à laquelle du carburant à haute pression alimente un accumulateur (16) duquel est prélevé du carburant pour être injecté dans le moteur à combustion interne. Une pompe de circulation (10) sert à alimenter le côté aspiration de la pompe haute pression (14) depuis un réservoir (12). Entre la pompe de circulation (10) et la pompe haute pression (14) se trouve un dispositif de dosage de carburant (30) qui sert à réguler le flux d'amenée de carburant de la pompe de circulation (10) à la pompe haute pression (14). Un dispositif de limitation de pression (44) sert à limiter la pression dans la partie haute pression (42) située en aval de la pompe haute pression (14), ledit dispositif de limitation de pression établissant une liaison entre la partie haute pression (42) et une partie de relâchement de pression (40), en cas de dépassement d'une pression prédéterminée. Le dispositif de limitation de pression (44) sert également à refermer ou au moins à limiter la section de flux dans la liaison (40) entre la pompe de circulation (10) et la pompe haute pression (14), lorsque la liaison entre la partie haute pression (42) et la partie de relâchement de pression (40) est établie.
PCT/DE2003/002701 2002-11-26 2003-08-11 Systeme d'injection de carburant pour moteur a combustion interne WO2004048770A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002154984 DE10254984A1 (de) 2002-11-26 2002-11-26 Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10254984.2 2002-11-26

Publications (1)

Publication Number Publication Date
WO2004048770A1 true WO2004048770A1 (fr) 2004-06-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/002701 WO2004048770A1 (fr) 2002-11-26 2003-08-11 Systeme d'injection de carburant pour moteur a combustion interne

Country Status (2)

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DE (1) DE10254984A1 (fr)
WO (1) WO2004048770A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2899664A1 (fr) * 2006-04-10 2007-10-12 Eaton Sa Monegasque Dispositif limiteur de pression
WO2012089370A1 (fr) * 2010-12-27 2012-07-05 Robert Bosch Gmbh Conjoncteur-disjoncteur pour un système d'injection de carburant d'un moteur à combustion interne
WO2012089371A1 (fr) * 2010-12-27 2012-07-05 Robert Bosch Gmbh Pompe d'injection pour un système d'injection de carburant
CN110939531A (zh) * 2018-09-21 2020-03-31 罗伯特·博世有限公司 用于内燃机的燃料输送装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0809016A1 (fr) * 1996-05-22 1997-11-26 Lucas Industries Public Limited Company Dispositif à soupape
DE19738502A1 (de) * 1997-09-03 1999-03-04 Bosch Gmbh Robert System zur Hochdruckerzeugung
DE10059425A1 (de) * 2000-11-30 2002-06-06 Bosch Gmbh Robert Kraftstoffeinspritzpumpe für Brennkraftmaschinen, insbesondere Dieselmotoren

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0809016A1 (fr) * 1996-05-22 1997-11-26 Lucas Industries Public Limited Company Dispositif à soupape
DE19738502A1 (de) * 1997-09-03 1999-03-04 Bosch Gmbh Robert System zur Hochdruckerzeugung
DE10059425A1 (de) * 2000-11-30 2002-06-06 Bosch Gmbh Robert Kraftstoffeinspritzpumpe für Brennkraftmaschinen, insbesondere Dieselmotoren

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2899664A1 (fr) * 2006-04-10 2007-10-12 Eaton Sa Monegasque Dispositif limiteur de pression
WO2007116148A1 (fr) * 2006-04-10 2007-10-18 Borgwarner Inc. Dispositif limiteur de pression
WO2012089370A1 (fr) * 2010-12-27 2012-07-05 Robert Bosch Gmbh Conjoncteur-disjoncteur pour un système d'injection de carburant d'un moteur à combustion interne
WO2012089371A1 (fr) * 2010-12-27 2012-07-05 Robert Bosch Gmbh Pompe d'injection pour un système d'injection de carburant
CN110939531A (zh) * 2018-09-21 2020-03-31 罗伯特·博世有限公司 用于内燃机的燃料输送装置

Also Published As

Publication number Publication date
DE10254984A1 (de) 2004-06-03

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