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EP1076176A2 - Dispositif d'injection pour un moteur à combustion interne - Google Patents

Dispositif d'injection pour un moteur à combustion interne Download PDF

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Publication number
EP1076176A2
EP1076176A2 EP00117010A EP00117010A EP1076176A2 EP 1076176 A2 EP1076176 A2 EP 1076176A2 EP 00117010 A EP00117010 A EP 00117010A EP 00117010 A EP00117010 A EP 00117010A EP 1076176 A2 EP1076176 A2 EP 1076176A2
Authority
EP
European Patent Office
Prior art keywords
fuel
injection system
control valve
pump
volume flow
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.)
Withdrawn
Application number
EP00117010A
Other languages
German (de)
English (en)
Other versions
EP1076176A3 (fr
Inventor
Helmut Hummel
Christoph Klesse
Klaus Rübling
Eckbert Zander
Christian Taudt
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1076176A2 publication Critical patent/EP1076176A2/fr
Publication of EP1076176A3 publication Critical patent/EP1076176A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • F04B23/103—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type being a radial piston pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary pumps

Definitions

  • the invention relates to an injection system for a Internal combustion engine according to the preamble of claim 1.
  • common rail injection systems for diesel engines usually have a pre-feed pump, the fuel from a fuel tank and to a high pressure pump forwards the fuel to inject the fuel the combustion chambers of the diesel engine required high Injection pressure generated.
  • the high pressure pump is on the output side connected to a pressure accumulator (English: common rail), from the several injectors the fuel to be injected Respectively.
  • Is between the high pressure pump and the pressure accumulator further arranged a high pressure control valve, which at Exceeding a predetermined maximum pressure Branch fuel branches and into the fuel tank until the fuel pressure returns to predetermined maximum pressure has dropped.
  • a high pressure control valve which at Exceeding a predetermined maximum pressure Branch fuel branches and into the fuel tank until the fuel pressure returns to predetermined maximum pressure has dropped.
  • the invention is therefore based on the object Injection system for an internal combustion engine at the beginning to create the kind described with a possible low pre-pressure of the pre-feed pump.
  • the task is - starting from the one described above known injection system - according to the preamble of Claim 1, by the characterizing features of the claim 1 solved.
  • the invention encompasses the general technical teaching that High pressure pump fuel flow no longer - how so far - based on the maximum delivery rate of the high pressure pump dimensioned at the respective speed, but on the actual fuel requirement of the injection system at align the respective speed.
  • volume flow control valve in connection with the pre-feed pump is designed so that the fuel flow through the Volume flow control valve in the open position of the Volume flow control valve substantially equal to the maximum Fuel consumption of the injection system is one Excess fuel supply to the high pressure pump avoid.
  • One way to do this is to use a smaller pre-feed pump with a lower inlet pressure, the pre-pressure generated by the pre-feed pump so is dimensioned that the fuel flow through the Volume flow control valve in the open position of the Volume flow control valve substantially equal to the maximum Fuel consumption of the injection system is.
  • volume flow control valve to use that in the open Position has a reduced throttle cross-section, the throttle cross section in the open position of the Volume flow control valve is dimensioned so that the Fuel flow through the flow control valve in the open position substantially equal to the maximum Fuel consumption of the injection system is.
  • the injection system shown schematically in FIG. 1 is used for supplying fuel to a four-cylinder diesel engine, the diesel engine not shown for simplicity is.
  • the shown Injection system first an electrically operated Pre-feed pump 1 on, the fuel from a fuel tank Pumps 2 and forwards to a high pressure pump 3, which to inject fuel into the combustion chambers of the Diesel engine generates the required injection pressure.
  • the High pressure pump 3 is a radial piston pump with three cylinders arranged, but other embodiments of the High pressure pump 3 possible.
  • On the output side is High pressure pump 3 with a pressure accumulator 4 (English: common rail), from which four injections 5.1 to 5.4 den obtain fuel to be injected.
  • the injectors 5.1 to 5.4 are, for example, from an electronic Control unit 9 (ECU) controlled.
  • ECU electronic Control unit 9
  • the injection system shown has pressure control First, a pre-pressure control valve 6, which is parallel to the Pre-feed pump 1 is switched and when a predetermined maximum form part of the of the Pre-feed pump 1 delivered fuel flow to the Intake side of the feed pump 1 returns, which Pre-pressure control valve 6 designed as a differential pressure valve and therefore works without external control.
  • the injection system also has pressure control High pressure control valve 7 that between the high pressure pump 3rd and the pressure accumulator 4 is arranged and part of the the high pressure pump 3 delivered fuel flow in the Can return fuel tank 2.
  • the mechanical The high-pressure control valve 7 is activated by a electromagnetic actuator 8, which with the electronic Control unit 9 (ECU - Electronic Control Unit) connected , the electronic control unit 9 being the controller the entire injection system and takes over as Input variables include the speed of the Internal combustion engine, the phase angle of the drive shaft of the High pressure pump 3 and other system sizes received.
  • a flush line 10 from the output side with the housing the high pressure pump 3 is connected to the high pressure pump 3 what to flush with fuel during normal operation causes cooling and lubrication of the high pressure pump 3. Then leaves the supplied via the flushing line 10 Fuel again the high pressure pump 3 and is over a Return line 11 is returned to the fuel tank 2.
  • Fuel is known to be the fact that the over the Flush line 10 branched fuel flow build up pressure delayed during the starting process of the internal combustion engine, so that it starts relatively poorly.
  • a check valve 12 is arranged, the first opens when the pre-feed pump 1 has built up a pressure, which is sufficient to operate the high pressure pump 3.
  • a throttle 13 is arranged in the flushing line 10, which at normal operation of the injection system via the flush line 10 branching fuel flow limited.
  • a volume flow control valve 14 is arranged, mechanically by an electromagnetic actuator 15 is driven, the electromagnetic actuator 15th is controlled by the electronic control unit 9.
  • the Volume flow control valve 14 enables a stepless Setting the throttle cross section between the Pre-feed pump 1 and the high pressure pump 3 to which the High pressure pump 3 supplied fuel flow to the respective Adjust the delivery rate of the high pressure pump 3.
  • the Low-pressure control by the volume flow control valve is compared to the high pressure side pressure control by the High-pressure control valve 7 advantageous because a high-pressure side Return of compressed and heated fuel is economically disadvantageous.
  • volume flow control valve 14 by the electronic control unit 9 from an open one Position in an at least partially closed position can control, the throttle cross section of the Volume flow control valve 14 in its open position in is so large that the maximum fuel requirement the injection system through the volume flow control valve 14 can flow.
  • the maximum flow through the Volume flow control valve 14 is in contrast to the known injection system not described at the beginning the maximum delivery capacity of the high pressure pump 3, but on the maximum fuel requirement of the injection system aligned.
  • the flow characteristic VCV alt max of the volume flow control valve 14 is shown in a conventional injection system from the diagram shown in FIG. 2, this characteristic representing the fuel flow through the volume flow control valve 14 in its open position. It can be seen that the flow characteristic of the volume flow control valve 14 in a conventional injection system is aligned with the delivery capacity of the high-pressure pump 3 at nominal speed n.
  • the diagram also shows a characteristic curve 17, which represents the actual fuel requirement of the injection system as a function of the engine speed n.
  • the fuel requirement of the injection system is maximum at MAX. It can be seen that the volume flow control valve 14 must be throttled considerably in a conventional injection system in order to avoid excess fuel supply to the high-pressure pump 3, for example throttling from VCV alt max to MAX at nominal speed n NOM .
  • the diagram shows a characteristic curve VCV neu max , which shows the fuel flow through the volume flow control valve 14 in an injection system according to the invention when the volume flow control valve 14 is open. It can be seen that the fuel flow through the volume flow control valve 14 in the open state of the volume flow control valve 14 is equal to the maximum fuel consumption MAX of the injection system, so that an excess fuel supply to the high-pressure pump 3 is avoided with the need for high-pressure side shutdown by the high-pressure control valve 7.
  • the maximum cross section of the Volume flow control valve 14 at the maximum Fuel consumption MAX can be that of the pre-feed pump 1 generated form can be chosen lower.
  • the pre-pressure generated by the pre-feed pump 1 less than 4 bar, so that advantageously also electrically driven pre-feed pumps can be used.
  • the invention is not limited in its execution the preferred exemplary embodiments given above. Rather, a number of variants are conceivable, which of the solution shown also fundamentally different makes use of any type.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
EP00117010A 1999-08-10 2000-08-08 Dispositif d'injection pour un moteur à combustion interne Withdrawn EP1076176A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19937673A DE19937673A1 (de) 1999-08-10 1999-08-10 Einspritzanlage für eine Brennkraftmaschine
DE19937673 1999-08-10

Publications (2)

Publication Number Publication Date
EP1076176A2 true EP1076176A2 (fr) 2001-02-14
EP1076176A3 EP1076176A3 (fr) 2003-11-12

Family

ID=7917809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00117010A Withdrawn EP1076176A3 (fr) 1999-08-10 2000-08-08 Dispositif d'injection pour un moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP1076176A3 (fr)
DE (1) DE19937673A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1180595A2 (fr) † 2000-08-16 2002-02-20 Robert Bosch Gmbh Système d'alimentation en carburant
WO2002073029A2 (fr) * 2001-03-14 2002-09-19 Robert Bosch Gmbh Systeme d'injection a rampe commune destine a des moteurs a combustion interne
EP1338787A1 (fr) * 2002-02-21 2003-08-27 Robert Bosch Gmbh Système hydraulique de décharge de pression pour un dispositif d'injection de carburant
WO2004076847A1 (fr) * 2003-02-25 2004-09-10 Robert Bosch Gmbh Dispositif d'injection de carburant pour un moteur a combustion interne
CN104141543A (zh) * 2013-05-09 2014-11-12 福特环球技术公司 高压燃料泵保护

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006006557A1 (de) * 2006-02-13 2007-08-23 Siemens Ag Kraftstoffeinspritz-System
DE102007026833A1 (de) 2007-06-06 2008-12-11 Hydraulik-Ring Gmbh Volumenstromsteuerventil
DE102007026834A1 (de) 2007-06-06 2008-12-11 Hydraulik-Ring Gmbh Elektromagnetisches Regelventil und Einspritzanlage für eine Brennkraftmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025887A1 (fr) * 1994-03-23 1995-09-28 Siemens Aktiengesellschaft Systeme permettant d'injecter du carburant dans les cylindres d'un moteur a combustion interne
WO2000011342A1 (fr) * 1998-08-25 2000-03-02 Siemens Aktiengesellschaft Procede permettant la montee rapide de la pression de carburant dans un accumulateur de carburant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025887A1 (fr) * 1994-03-23 1995-09-28 Siemens Aktiengesellschaft Systeme permettant d'injecter du carburant dans les cylindres d'un moteur a combustion interne
WO2000011342A1 (fr) * 1998-08-25 2000-03-02 Siemens Aktiengesellschaft Procede permettant la montee rapide de la pression de carburant dans un accumulateur de carburant

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1180595A2 (fr) † 2000-08-16 2002-02-20 Robert Bosch Gmbh Système d'alimentation en carburant
EP1180595B2 (fr) † 2000-08-16 2011-02-23 Robert Bosch Gmbh Système d'alimentation en carburant
WO2002073029A2 (fr) * 2001-03-14 2002-09-19 Robert Bosch Gmbh Systeme d'injection a rampe commune destine a des moteurs a combustion interne
WO2002073029A3 (fr) * 2001-03-14 2003-10-23 Bosch Gmbh Robert Systeme d'injection a rampe commune destine a des moteurs a combustion interne
EP1338787A1 (fr) * 2002-02-21 2003-08-27 Robert Bosch Gmbh Système hydraulique de décharge de pression pour un dispositif d'injection de carburant
WO2004076847A1 (fr) * 2003-02-25 2004-09-10 Robert Bosch Gmbh Dispositif d'injection de carburant pour un moteur a combustion interne
US7850435B2 (en) 2003-02-25 2010-12-14 Robert Bosch Gmbh Fuel injection device for an internal combustion engine
CN104141543A (zh) * 2013-05-09 2014-11-12 福特环球技术公司 高压燃料泵保护
US20140336901A1 (en) * 2013-05-09 2014-11-13 Ford Global Technologies, Llc High-pressure fuel pump protection

Also Published As

Publication number Publication date
EP1076176A3 (fr) 2003-11-12
DE19937673A1 (de) 2001-02-22

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