EP1008746A2 - Système d'injection de combustible - Google Patents

Système d'injection de combustible Download PDF

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Publication number
EP1008746A2
EP1008746A2 EP99122213A EP99122213A EP1008746A2 EP 1008746 A2 EP1008746 A2 EP 1008746A2 EP 99122213 A EP99122213 A EP 99122213A EP 99122213 A EP99122213 A EP 99122213A EP 1008746 A2 EP1008746 A2 EP 1008746A2
Authority
EP
European Patent Office
Prior art keywords
fuel
pump
injection system
feed pump
high pressure
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.)
Granted
Application number
EP99122213A
Other languages
German (de)
English (en)
Other versions
EP1008746A3 (fr
EP1008746B1 (fr
Inventor
Peter Ing. Schueler (Grad.)
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 EP1008746A2 publication Critical patent/EP1008746A2/fr
Publication of EP1008746A3 publication Critical patent/EP1008746A3/fr
Application granted granted Critical
Publication of EP1008746B1 publication Critical patent/EP1008746B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/40—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements with means for detection of clogging
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/34—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements by the filter structure, e.g. honeycomb, mesh or fibrous

Definitions

  • the invention relates to a fuel injection system, in particular common rail system, with a pre-feed pump, which turns a fuel flow from a fuel tank into a High pressure pump delivers, with a fuel filter related to the direction of flow downstream or upstream of the Prefeed pump is arranged.
  • the object of the present invention is a Provide fuel injection system in which the Lifetime of the pre-feed pump and the high pressure pump is increased. In particular, if the value is too low Damage to the high pressure pump engine be avoided.
  • the job is with a fuel injection system, in particular common rail system, with a pre-feed pump, which turns a fuel flow from a fuel tank into a High pressure pump delivers, with a fuel filter related to the direction of flow downstream or upstream of the Pre-feed pump is arranged by a Protection circuit dependent on the fuel filter pressure difference solved.
  • the feed quantity of the high pressure pump is essential from the delivery head to be provided by the pre-feed pump dependent.
  • the head increases with the pollution of the Fuel filter due to increasing Flow resistance too.
  • the delivery rate increases due from the pre-feed pump characteristic.
  • a clogging of the Fuel filters are used in the well-known common rail systems not recognized in time, making it one of the failures described above can occur.
  • Through the protection circuit according to the invention becomes an impermissible Avoid increase in discharge pressure. This will both the pre-feed pump and the high pressure pump are protected. It is also conceivable before and after the fuel filter Provide pressure sensors with which the differential pressure can be recorded.
  • valve device which is the fuel flow delivered by the pre-feed pump depending on the fuel filter pressure difference either back to the fuel tank or to the High pressure pump promotes. If the pressure is in the flow direction seen downstream of the fuel filter due to Pollution increases too much, the fuel flow from the pre-feed pump to the high pressure pump, but fed back into the fuel tank. Thereby the engine is switched off and the high pressure pump is protected.
  • valve means a Has valve housing in which a spring preloaded Control piston is reciprocable, depending on a shut-off hole from the fuel filter pressure difference in the valve housing through which the from the pre-feed pump delivered fuel flow reaches the high pressure pump, or exposes a pilot hole in the valve housing, through which the delivered by the pre-feed pump Fuel flow gets back into the fuel tank.
  • the shut-off hole becomes a high-pressure pump largely closed before the drain hole to Fuel tank is opened for quick shutdown upon reaching the critical To achieve fuel filter differential pressure.
  • the Preload force of the spring can be critical Differential pressure value can be specified. Once this critical differential pressure value is reached, the Discharge hole in the valve housing released. At a the injection system works with a lower pressure difference normal.
  • Another special embodiment of the invention is characterized in that in a bypass that the Bypasses valve device, an expansion element arranged is.
  • the protection circuit according to the invention would be at low Temperatures can also be caused by fueled fuel. Around Avoiding this is parallel to the valve device the expansion element arranged.
  • the expansion element opens the bypass at low temperatures and ensures that the fuel flow delivered by the pre-feed pump reaches the high pressure pump.
  • valve device and / or the expansion element in a cover of the fuel filter are integrated. This makes it particularly compact Provided solution that is for a modular Suitable for construction.
  • the protection circuit according to the invention is the Part of the low pressure circuit of a common rail Injection system.
  • this protection circuit can in principle also used in other injection systems in which the operation with too heavily soiled Filtering fuel should be avoided. Since the Fuel filter differential pressure flow rate and this usually depends on the engine speed Function of the protection circuit initially only at high Engine speed, so that limited operation of the Engine at reduced speed and still permissible Pressure drop at the fuel filter remains possible.
  • Tests were carried out within the scope of the present invention carried out where it was found that Damage to the pre-feed pump as a result of filter clogging may occur. It can happen that the Delivery pressure rises so high that one in the Pre-feed pump integrated pressure relief valve appeals. Place in the sealing seat of the pressure relief valve then pre-filter dirt particles become stuck, causing there is a permanent leak and that Delivery capacity of the pre-feed pump accordingly is affected.
  • the pumped comes from the pre-feed pump 2 Fuel flow via a line 4 to one Junction point 5. Junction point 5 connects line 4 with two lines 6 and 7. Line 6 leads to a fuel filter 8. In the fuel filter 8 is the one delivered by the pre-feed pump 2 Fuel flow cleaned. From the fuel filter 8 the delivered fuel flow passes through a line 9 to a further branch 20.
  • the branch point 20 connects the line 9 with two further lines 10a and 11. Arrived via line 11 the fuel flow delivered to a valve device 12.
  • the valve device 12 has a valve housing 13 in which a control piston 14 can be moved back and forth is recorded.
  • the valve housing 13 is over the Lines 7 and 11 both with the entry side as well connected to the outlet side of the fuel filter 8.
  • the control piston 14 is in the by a spring 15 Valve housing 13 biased.
  • the circuit according to the invention is used when reaching one predeterminable by the biasing force of the spring 15 Differential pressure value of the flow through the Fuel filter 8 shut off.
  • the Pre-feed pump 2 delivered fuel flow to the Fuel tank 1 returned. This will make the engine turned off and the high pressure pump protected.
  • Temperature-dependent switching valve 26 is arranged.
  • the Valve 26 contains an expansion element 28, which in one Valve housing 27 is reciprocally received. Out a pin 29 enters the wax-filled expansion element 28 whose end is supported on the valve housing 27.
  • Expansion element 28 is formed piston-shaped, whereby the Connection of lines 10a and 10b at temperatures above interrupted the point of staining of the diesel fuel becomes.
  • the preload force ensures Compression spring 31, which is arranged in the valve housing 27, for the expansion element 28 to the left against the pin 29 moved up to the stop element 32 and thereby the Connection between the lines 10a and 10b made becomes.
  • Switching valve 26 can fueled fuel over the Line 10a and 10b to the high pressure pump. If the pin 29 due to heating from the expansion element 28 is pushed out, it is supported on the valve housing 27 from. A further expansion of the wax filling of the Expansion element 28 then leads to the fact that Expansion element 28 moved to the right and the line 10a is closed. Only when low Expect fuel temperatures with contaminated fuel is, the switching valve 26 ensures that the engine can continue to be operated.
  • the principle shown schematically in the figure will of course also work if the Pre-feed pump 2 arranged after the fuel filter 8 is.
  • the fuel injection system shown, in particular its high pressure pump, is automatic, even at failure to change the filter, before dirty Fuel filter protected.
  • With the fuel filter 8 it is a so-called main fuel filter.
  • In addition to this main fuel filter is usually still a coarse-mesh pre-filter is used.
  • Operation of the engine with contaminated fuel is by the circuit according to the invention is not restricted.
  • the Switching is basically reversible and allows appropriate software strategy a restricted Driving at low engine speed too.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP99122213A 1998-12-11 1999-11-06 Système d'injection de combustible Expired - Lifetime EP1008746B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19857249A DE19857249A1 (de) 1998-12-11 1998-12-11 Kraftstoffeinspritzsystem
DE19857249 1998-12-11

Publications (3)

Publication Number Publication Date
EP1008746A2 true EP1008746A2 (fr) 2000-06-14
EP1008746A3 EP1008746A3 (fr) 2003-09-17
EP1008746B1 EP1008746B1 (fr) 2004-12-22

Family

ID=7890783

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99122213A Expired - Lifetime EP1008746B1 (fr) 1998-12-11 1999-11-06 Système d'injection de combustible

Country Status (4)

Country Link
US (1) US6520162B1 (fr)
EP (1) EP1008746B1 (fr)
JP (1) JP2000170617A (fr)
DE (2) DE19857249A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1338787A1 (fr) * 2002-02-21 2003-08-27 Robert Bosch Gmbh Système hydraulique de décharge de pression pour un dispositif d'injection de carburant
EP1683960A2 (fr) 2004-12-20 2006-07-26 Filtrauto Système de filtration à gazole
WO2008017547A1 (fr) * 2006-08-09 2008-02-14 Robert Bosch Gmbh Dispositif et procédé pour réguler un débit volumique de carburant dans un système de circulation à basse pression pour un moteur à combustion interne
WO2013075946A1 (fr) * 2011-11-21 2013-05-30 Robert Bosch Gmbh Système de refoulement de carburant pour un véhicule
WO2021018840A1 (fr) * 2019-07-30 2021-02-04 Mtu Friedrichshafen Gmbh Procédé pour faire fonctionner un système d'alimentation en carburant d'un moteur à combustion interne et moteur à combustion interne permettant la mise en œuvre d'un tel procédé

Families Citing this family (14)

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Publication number Priority date Publication date Assignee Title
GB2441309B (en) * 2006-08-18 2011-03-30 Parker Hannifin Corp De-aeration system
DE102007000855B4 (de) * 2006-12-27 2020-06-10 Denso Corporation Kraftstofffördergerät und Speicherkraftstoffeinspritzsystem, das dieses aufweist
US7640919B1 (en) 2008-01-31 2010-01-05 Perkins Engines Company Limited Fuel system for protecting a fuel filter
US20090211556A1 (en) * 2008-02-25 2009-08-27 Perkins Engines Company Limited System for maintaining a pump inlet pressure
US7926470B2 (en) * 2008-04-11 2011-04-19 Caterpillar Inc. Compact relief valve having damping functionality
US7827971B2 (en) * 2009-01-26 2010-11-09 Gm Global Technology Operations, Inc. Engine assembly with fuel filter gas removal apparatus
JP4803269B2 (ja) * 2009-02-24 2011-10-26 株式会社デンソー 脈動低減装置
US9316187B2 (en) * 2011-01-18 2016-04-19 Carter Fuel Systems, Llc Diesel fuel system with advanced priming
DE102014211978A1 (de) 2014-06-23 2015-12-24 Robert Bosch Gmbh Niederdruckkreis für ein Kraftstoffeinspritzsystem mit einem temperaturgesteuerten Bypass
US20160108876A1 (en) * 2015-12-28 2016-04-21 Caterpillar Inc. Oil filter
IT201800007435A1 (it) * 2018-07-23 2020-01-23 Impianto di alimentazione del carburante da un serbatoio ad un motore a combustione interna e metodo per controllare detto impianto
US10865728B2 (en) * 2019-01-18 2020-12-15 Pratt & Whitney Canada Corp. Method of using backflow from common-rail fuel injector
US10738749B1 (en) 2019-01-18 2020-08-11 Pratt & Whitney Canada Corp. Method of using heat from fuel of common-rail injectors
US11754028B2 (en) * 2021-06-23 2023-09-12 Ford Global Technologies, Llc Fuel system diaphragm valve

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US5195494A (en) * 1992-02-27 1993-03-23 Walbro Corporation Fuel delivery system with outlet pressure regulation
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DE19801355B4 (de) * 1998-01-16 2004-04-08 Robert Bosch Gmbh Hochdruckpumpe zur Kraftstoffversorgung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1338787A1 (fr) * 2002-02-21 2003-08-27 Robert Bosch Gmbh Système hydraulique de décharge de pression pour un dispositif d'injection de carburant
EP1683960A2 (fr) 2004-12-20 2006-07-26 Filtrauto Système de filtration à gazole
EP1683960A3 (fr) * 2004-12-20 2008-08-27 Filtrauto Système de filtration à gazole
WO2008017547A1 (fr) * 2006-08-09 2008-02-14 Robert Bosch Gmbh Dispositif et procédé pour réguler un débit volumique de carburant dans un système de circulation à basse pression pour un moteur à combustion interne
WO2013075946A1 (fr) * 2011-11-21 2013-05-30 Robert Bosch Gmbh Système de refoulement de carburant pour un véhicule
WO2021018840A1 (fr) * 2019-07-30 2021-02-04 Mtu Friedrichshafen Gmbh Procédé pour faire fonctionner un système d'alimentation en carburant d'un moteur à combustion interne et moteur à combustion interne permettant la mise en œuvre d'un tel procédé
CN114174656A (zh) * 2019-07-30 2022-03-11 罗尔斯·罗伊斯解决方案有限公司 用于监测内燃机的燃料供应系统的方法和用于执行这样的方法的内燃机

Also Published As

Publication number Publication date
EP1008746A3 (fr) 2003-09-17
DE19857249A1 (de) 2000-06-15
EP1008746B1 (fr) 2004-12-22
JP2000170617A (ja) 2000-06-20
US6520162B1 (en) 2003-02-18
DE59911324D1 (de) 2005-01-27

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