EP1109999B1 - Procede permettant la montee rapide de la pression de carburant dans un accumulateur de carburant - Google Patents

Procede permettant la montee rapide de la pression de carburant dans un accumulateur de carburant Download PDF

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Publication number
EP1109999B1
EP1109999B1 EP99952431A EP99952431A EP1109999B1 EP 1109999 B1 EP1109999 B1 EP 1109999B1 EP 99952431 A EP99952431 A EP 99952431A EP 99952431 A EP99952431 A EP 99952431A EP 1109999 B1 EP1109999 B1 EP 1109999B1
Authority
EP
European Patent Office
Prior art keywords
fuel
pump
valve
internal combustion
combustion engine
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.)
Expired - Lifetime
Application number
EP99952431A
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German (de)
English (en)
Other versions
EP1109999A1 (fr
Inventor
Christoph Klesse
Martin Werner
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Siemens AG
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Siemens AG
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Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1109999A1 publication Critical patent/EP1109999A1/fr
Application granted granted Critical
Publication of EP1109999B1 publication Critical patent/EP1109999B1/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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/38—Pumps characterised by adaptations to special uses or conditions
    • F02M59/42—Pumps characterised by adaptations to special uses or conditions for starting of engines

Definitions

  • the invention relates to a method for building up the fuel pressure in a fuel storage according to the preamble of claim 1.
  • the fuel is from a high pressure pump pumped into a fuel accumulator and injected into the combustion chamber of the internal combustion engine via injectors.
  • WO 95/25887 describes a method and an apparatus for Regulation of the fuel pressure in a fuel accumulator is known, in which a valve between a pre-feed pump and a volume flow controlled high pressure pump is provided, that regulates the fuel supply to the pump chamber of the high pressure pump. Depending on the position of the valve and the speed of the high-pressure pump, the pump room is empty, partially or entirely filled, causing the flow rate of the fuel from the high pressure pump in the fuel reservoir is determined.
  • EP-A-0 481 964 describes a common rail injection system a high pressure pump to supply a fuel storage known, an electromagnetic in the high pressure pump switchable valve is provided, with which a connection between high pressure outlet and low pressure area of the Pump can be opened and closed. With the help of the solenoid valve a sudden increase in pressure can reliably in fuel storage, the so-called common rail, also at occurring faults or malfunctions can be prevented. Because in this known arrangement between low pressure fuel pump and the high pressure pump no volume flow control is provided, the pump room of the high pressure pump constantly completely filled with fuel.
  • the object of the invention is to provide a method for rapid build-up of fuel pressure in the fuel accumulator to provide when starting an internal combustion engine.
  • the fuel supply during the shutdown process regulated to the high pressure pump so that the pump cylinder until the internal combustion engine stops and the High pressure pump to be filled, so the following Starting process regardless of the operating state of the previous one Switching off the high pressure pump largely or to provide completely filled pump room.
  • a High pressure pump reaches its maximum when the pump chamber is full Conveying capacity, which is advantageous when starting a faster Pressure build-up in the fuel accumulator is reached.
  • Figure 1 shows a common rail injection system with a Fuel tank 1, from which via a prefeed pump 2 Fuel filter 4 and an adjustable valve 5 to one High pressure pump 6 fuel is led.
  • the high pressure pump 6 is via a fuel line 8 to a fuel accumulator 9 connected.
  • the fuel accumulator 9 is equipped with injectors 13 in connection that the fuel from the fuel storage 9 in the combustion chamber of an internal combustion engine 14 inject.
  • the injectors 13 have leakage lines 15 on, which are led to the fuel tank 1.
  • the pre-feed pump 2 is driven by an electric motor 3.
  • the High-pressure pump 6 is driven by the internal combustion engine and turns with fixed gear ratios proportional to the engine speed of the internal combustion engine, where sufficient fuel pressure under all operating conditions is built up in the fuel storage.
  • a high-pressure pump 6 with a positive drive Pump pistons with constant stroke volume for pumping fuel and generating the fuel pressure in the fuel accumulator 9 used by the internal combustion engine 14 is driven.
  • the Flow rate high at high engine speed.
  • the adjustable valve 5 is used, the fuel flow reduced from the pre-feed pump to the high pressure pump 6, e.g. by changing the cross section of the inlet to the high pressure pump 6 through a valve 5, so that the pump chamber is only partially filled with fuel and the Delivery volume flow to the fuel accumulator is reduced accordingly.
  • the valve 5 is preferably a slide valve educated.
  • a valve 5 pro will point into a pump chamber Pump cylinder or a valve 5 for all pump cylinders used.
  • valve 5 is digital switchable valve designed for the duration of a Suction of the high pressure pump 6 temporarily opens or closes.
  • the duration of opening or closing and the times opening and closing during a suction process influence the desired degree of filling of the pump chamber High pressure pump 6.
  • This is preferably digitally switchable Valve 5 is designed as a seat valve.
  • valve 5 is a rotary slide valve trained that one with each pump revolution Dosable, pre-measured volume of the respective pumping rooms fed to the high pressure pump 6. The dosage is done by varying the angle between opening and closing the Inlets for the individual pump cylinders are synchronous to the angle Shaft of the high pressure pump 6 and thus depending on the Position of the pump pistons of the high pressure pump 6.
  • the prefeed pump 2 at least one pump cylinder with adjustable stroke volume on, whereby the pump chamber of the high pressure pump 6 is supplied Amount of fuel is affected.
  • the high pressure pump 6 can be designed as a variable displacement pump in which the stroke volume of the pump chamber can be adjusted is.
  • this is the fuel accumulator 9 amount of fuel supplied via the controllable Valve 5 set that with a first control line 7 a control unit 11 is connected.
  • the control unit 11 is connected to the injectors 13 via second control lines 12.
  • the control unit 11 is connected to a signal line with a pressure sensor 10 connected to the fuel accumulator 9 is connected.
  • An adjustable pressure valve 30 is via a third control line 31 to the control unit 11 connected.
  • the pressure valve 30 is used primarily for rapid pressure relief in the fuel accumulator 9, with excess fuel is passed into the fuel tank 1.
  • the control unit 11 controls the valve 5 and the pressure valve 30.
  • control unit 11 is on via a data line 16 the components of the internal combustion engine 14 connected.
  • valve 5 When switching off, the valve 5 is set to a predetermined Minimum cross-section opened. Because of the inertia the engine 14, the remaining engine range and pump revolutions around the pump chamber largely or completely to be filled with fuel, whereby the pre-feed pump 2 continue to operate until the internal combustion engine comes to a standstill becomes.
  • the high-pressure pump 6 preferably has a plurality of pumping spaces on, which are preferably all filled with fuel.
  • the High pressure pump 6 and the prefeed pump 2 from the internal combustion engine 14 driven and rotate with fixed Gear ratio proportional to the engine speed Internal combustion engine 14.
  • the prefeed pump 2 is preferred integrated in the housing of the high pressure pump 6.
  • valve 5 When the internal combustion engine 14 is switched off, this too Embodiment, the valve 5 to a predetermined minimum cross section turned on so that after the end of the shutdown process the pump chamber of the high pressure pump 6 largely or completely is filled with fuel. Because of the inertia the engine 14, the remaining engine range and pump revolutions to a large extent or fill completely with fuel.
  • the high pressure pump 6 powered by a motor.
  • Another embodiment of the low-pressure fuel control consists of an adjustable pre-feed pump to provide, which is designed to be adjustable in speed.
  • the the high pressure pump 6 and thus the fuel accumulator 9 amount of fuel supplied is from the control unit 11 via the The speed of the adjustable pre-feed pump is set.
  • the pre-feed pump is electrically controlled Motor driven.
  • the pump speed is either constant or depending on the engine speed of the internal combustion engine 14th
  • the controllable pre-feed pump is opened during the shutdown process set a minimum speed so that after the end of the shutdown process, i.e. after the internal combustion engine has come to a standstill 14 and the high pressure pump 6, the pump chamber of the high pressure pump 6 is largely or completely filled with fuel.
  • a Low-pressure fuel control with a pressure-controlled Prefeed pump are used by the control unit 11 is controlled via a fourth control line. Doing so the fuel flow supplied to the fuel accumulator 9 controlled the pressure in the pre-feed pump.
  • the target pressure in the pre-feed pump set to a minimum value so that the flow rate in the high pressure pump is so high that after the end of the shutdown process the pump chamber of the high pressure pump 6 largely or is completely filled with fuel.
  • the controllable valve 5 changes the cross section of the inlet channel to the pump room and can e.g. as a slide valve or Seat valve can be designed depending on the embodiment open or closed when de-energized.
  • FIG. 2 shows schematically the sequence of the method with which the control unit 11 the rapid build-up of the fuel pressure controls in the fuel storage 9.
  • the process can take the form of individual discrete components or in the form of a sequence program will be realized.
  • the starting point of the method is that preceding a starting process S.
  • Operation of the internal combustion engine (state I), the under any operating condition, e.g. Idling, full throttle, etc., is switched off (state II), which is a switch-off process A initiates.
  • the driver of the Vehicle an operating element, e.g. press the ignition key, whereby the control unit 11 is signaled that a Shutdown process should be initiated.
  • the control unit 11 controls the shutdown process.
  • the pump chamber of the high pressure pump 6 In most operating conditions during the operation of the Internal combustion engine, especially at partial load or idle, is the pump chamber of the high pressure pump 6 only partially Filled with fuel.
  • the delivery volume flow of the high pressure pump 6 depends on the filling level of the pump room.
  • the controllable pressure valve 30 is preferably depressurized, whereby the fuel pressure in the fuel accumulator 9 drops (state III).
  • the injectors 13 are no longer activated and spray no more fuel in the combustion chamber of the internal combustion engine 14, a possibly existing ignition system being switched off becomes.
  • the control unit 11 is preferably part of the engine control unit.
  • the fuel supply to the high pressure pump 6 and the high pressure pump 6 are described by means of those in the exemplary embodiments Means regulated by the control unit 11 so that until the internal combustion engine 14 and the high-pressure pump come to a standstill 6 (state IV) the pump chamber of the high pressure pump 6 is largely or completely filled with fuel (condition III). After the internal combustion engine 14 and the High-pressure pump 6 (state IV), control unit 11 closes all other calculations related to the vehicle from time to time turns off or goes into a standby state, with which the end of the shutdown process (V) is reached.
  • a starter drives the internal combustion engine 14.
  • Dependent of the ratio of the pump speed to the motor speed and the Starter motor speed can be more than one pump revolution Second.
  • the time delay between adjusting valve 5 and change of the delivery volume flow to the fuel accumulator 9 be more than half a pump revolution. A corresponding There is also a time delay in the others described Embodiments.
  • a high pressure pump reaches its maximum delivery rate a pump room completely filled with fuel.
  • the time delay would be up to to completely fill the pump room and to maximum yourself setting delivery volume flow amount to some 100 ms, whereby the pressure build-up in the fuel accumulator 9 accordingly would delay.

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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)

Claims (7)

  1. Procédé pour établir rapidement la pression de carburant dans un accumulateur de carburant (9), dans le cas duquel:
    une pompe haute pression (6) envoie du carburant dans l'accumulateur de carburant (9), ce qui permet d'établir la pression de carburant,
    la pompe haute pression (6) présente une chambre de pompage, dans laquelle un piston de pompe envoie dans l'accumulateur de carburant (9) le carburant reçu,
    la chambre de pompage, au moins dans quelques états de fonctionnement du moteur à combustion interne, n'est que partiellement remplie de carburant,
       caractérisé en ce que
    pendant chaque phase de coupure (A) d'un moteur à combustion interne (14), l'arrivée de carburant à la chambre de pompage est régulée de telle façon que la chambre de pompage soit largement ou complètement remplie de carburant, et
    en ce que, de ce fait, pendant la phase de démarrage (S) du moteur à combustion interne (14) qui fait suite, la pompe haute pression (6) commence à délivrer du carburant avec la chambre de pompe largement ou complètement remplie.
  2. Procédé suivant la revendication 1, caractérisé en ce que le débit volumique fourni par la pompe haute pression (6) dépend du degré de remplissage de la chambre de pompage.
  3. Procédé suivant l'une des revendications 1 ou 2, caractérisé en ce que la chambre de pompage est remplie largement ou complètement de carburant, indépendamment des états de fonctionnement du moteur à combustion interne (14), présents avant le début de la phase de coupure.
  4. Procédé suivant l'une des revendications 1 ou 3, caractérisé en ce que, pendant la phase de coupure (A), l'arrivée de carburant à la chambre de pompage est commandée suivant un débit volumique minimal prédéfini.
  5. Procédé suivant l'une des revendications 1 à 4, caractérisé en ce que l'arrivée de carburant à la chambre de pompage est commandée par une soupape réglable (5) placée en amont de la chambre de pompage, la soupape (5) étant ouverte, pendant la phase de coupure (A), avec une section minimale prédéfinie.
  6. Procédé suivant l'une des revendications 1 à 4, caractérisé en ce que l'arrivée de carburant à la chambre de pompage est commandée par une pompe de mise en circulation initiale (2) placée en amont de la chambre de pompage, la pompe de mise en circulation initiale (2) étant commandée pendant la phase de coupure (A), pour présenter un débit volumique minimal prédéfini.
  7. Procédé suivant l'une des revendications 1 à 6, caractérisé en ce que la soupape (5) est réalisée sous la forme d'une soupape à tiroir, d'une soupape à tiroir rotatif, ou d'une soupape à siège.
EP99952431A 1998-08-25 1999-08-17 Procede permettant la montee rapide de la pression de carburant dans un accumulateur de carburant Expired - Lifetime EP1109999B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19838569 1998-08-25
DE19838569 1998-08-25
PCT/DE1999/002579 WO2000011342A1 (fr) 1998-08-25 1999-08-17 Procede permettant la montee rapide de la pression de carburant dans un accumulateur de carburant

Publications (2)

Publication Number Publication Date
EP1109999A1 EP1109999A1 (fr) 2001-06-27
EP1109999B1 true EP1109999B1 (fr) 2002-04-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99952431A Expired - Lifetime EP1109999B1 (fr) 1998-08-25 1999-08-17 Procede permettant la montee rapide de la pression de carburant dans un accumulateur de carburant

Country Status (3)

Country Link
EP (1) EP1109999B1 (fr)
DE (1) DE59901316D1 (fr)
WO (1) WO2000011342A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007026834A1 (de) 2007-06-06 2008-12-11 Hydraulik-Ring Gmbh Elektromagnetisches Regelventil und Einspritzanlage für eine Brennkraftmaschine
DE102009057403A1 (de) * 2009-12-08 2011-06-09 Continental Automotive Gmbh Vorrichtung zum Betreiben einer Kraftstoffversorgungseinrichtung für eine Brennkraftmaschine
DE102010008812A1 (de) * 2010-02-22 2011-08-25 Continental Automotive GmbH, 30165 Pumpeinrichtung und Verfahren zum Betreiben einer Pumpeinrichtung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19937673A1 (de) * 1999-08-10 2001-02-22 Siemens Ag Einspritzanlage für eine Brennkraftmaschine
DE10237586A1 (de) * 2002-08-16 2004-02-26 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE102013220488B4 (de) * 2013-10-10 2017-05-04 Continental Automotive Gmbh Vorrichtung und Verfahren zur Steuerung einer Kraftstoffpumpe während der ersten Betriebsstunden

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5058553A (en) * 1988-11-24 1991-10-22 Nippondenso Co., Ltd. Variable-discharge high pressure pump
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
DE19727413A1 (de) * 1997-06-27 1999-01-07 Bosch Gmbh Robert Kraftstoffeinspritzsystem für Brennkraftmaschinen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007026834A1 (de) 2007-06-06 2008-12-11 Hydraulik-Ring Gmbh Elektromagnetisches Regelventil und Einspritzanlage für eine Brennkraftmaschine
DE102009057403A1 (de) * 2009-12-08 2011-06-09 Continental Automotive Gmbh Vorrichtung zum Betreiben einer Kraftstoffversorgungseinrichtung für eine Brennkraftmaschine
DE102010008812A1 (de) * 2010-02-22 2011-08-25 Continental Automotive GmbH, 30165 Pumpeinrichtung und Verfahren zum Betreiben einer Pumpeinrichtung

Also Published As

Publication number Publication date
WO2000011342A1 (fr) 2000-03-02
EP1109999A1 (fr) 2001-06-27
DE59901316D1 (de) 2002-05-29

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