EP2357354B1 - Système hydraulique et système d'injection de carburant pour moteur à combustion interne - Google Patents

Système hydraulique et système d'injection de carburant pour moteur à combustion interne Download PDF

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Publication number
EP2357354B1
EP2357354B1 EP11151136.6A EP11151136A EP2357354B1 EP 2357354 B1 EP2357354 B1 EP 2357354B1 EP 11151136 A EP11151136 A EP 11151136A EP 2357354 B1 EP2357354 B1 EP 2357354B1
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EP
European Patent Office
Prior art keywords
pressure
accumulator
pressure accumulator
fuel injection
fuel
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.)
Not-in-force
Application number
EP11151136.6A
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German (de)
English (en)
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EP2357354A2 (fr
EP2357354A3 (fr
Inventor
Joachim Boltz
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2357354A2 publication Critical patent/EP2357354A2/fr
Publication of EP2357354A3 publication Critical patent/EP2357354A3/fr
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Publication of EP2357354B1 publication Critical patent/EP2357354B1/fr
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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
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/105—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive hydraulic drive
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—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
    • F02M63/02—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
    • 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
    • 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
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/025—Means for varying pressure in common rails by bleeding fuel pressure from 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
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/026—Means for reducing the pressure in common rails at power off
    • 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
    • F02M63/0285—Arrangement of common rails having more than one 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/09—Fuel-injection apparatus having means for reducing noise
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/022—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type having an accumulator storing pressurised fuel during pumping stroke of the piston for subsequent delivery to the injector
    • 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
    • F02M59/16—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps characterised by having multi-stage compression of fuel

Definitions

  • the invention relates to a fuel injection system for an internal combustion engine with a hydraulic system according to the preamble of claim 1.
  • Such a hydraulic system is from the DE 10 2007 010 495 A1 the applicant known.
  • a high-pressure pump delivers fuel into a fuel reservoir, which in turn is coupled to a pressure booster, the fuel with further pressure increase in a second high-pressure accumulator, in particular as so-called rail is formed promotes.
  • the pressure boosting device is equipped with a pressure piston acting for two compression chambers, so that a continuous delivery of the fuel can be done in the second high-pressure accumulator.
  • Such fuel injection systems having a pressure boosting device are used in particular at higher system pressures (in this case, system pressures higher than 3000 bar) are used for efficiency and strength reasons.
  • the known systems of this kind are usually designed in such a way that the pressure is reduced via the injectors of the fuel injection system, which are subject to leakage. In other words, this means that the pressure reduction rate depends on the leakage quantities of the injectors.
  • There are operating conditions of an internal combustion engine or of a fuel injection system in which relatively high pressure reduction rates are desired are. On the one hand, for safety reasons, especially after switching off the engine and on the other hand for reasons of comfort, since in a change from large to small load, the relatively high pressure should be adjusted lower partly for reasons of noise. If this does not happen, the part load has a relatively high noise level.
  • the injectors are designed for the lowest possible leakage, so that it becomes increasingly difficult to achieve a sufficiently high pressure reduction rate under the operating conditions mentioned.
  • a hydraulic system is known with a high-pressure accumulator, as well as from DE 10 2007 062 176 A1 , From the DE 10 2008 011 677 A1
  • a test device for a fuel injection system is known, which also includes a high-pressure accumulator.
  • the invention has the object, a fuel injection system for an internal combustion engine with a hydraulic system according to the invention according to the preamble of claim 1 such that an increased pressure reduction speed can be achieved.
  • This object is achieved in a hydraulic system with the features of claim 1.
  • the invention is based on the idea, by a pressure reduction device which is coupled to the second high-pressure accumulator, specifically and quickly to allow the desired pressure reduction.
  • the pressure reduction thus happens mainly not via the or with the second high-pressure accumulator coupled consumers, but via the (separate) pressure reducing device. Therefore, the at least one consumer can be optimized or minimized with regard to its leakage.
  • the pressure medium is fuel and the at least one consumer is an injector for injecting fuel into a combustion chamber of the internal combustion engine.
  • the pressure reduction device is arranged between the two high-pressure accumulators and leads from the second high-pressure accumulator flowing back into the first high-pressure accumulator.
  • the pressure reducing device is designed as a switchable between two positions overflow.
  • the pressure reduction device opens the outflow of the fuel from the second high pressure accumulator when a certain pressure ratio between the two high pressure accumulators is exceeded.
  • the first high pressure accumulator is coupled to a pressure control valve, which is connected to a low pressure region is.
  • the pressure in the first high pressure accumulator is determined by the pressure regulating valve, so that the pressure in the first high pressure accumulator also can not exceed a certain value.
  • the pressure regulating valve is formed by a control device of the motor vehicle electrically controlled.
  • a pressure reduction can therefore be achieved in a particularly simple manner that the control unit controls the pressure control valve, which then lowers the pressure in the first high pressure accumulator, whereupon the ratio between the pressure in the second high pressure accumulator and the pressure in the first high pressure accumulator increases, which in turn has the consequence in that the pressure in the second high-pressure accumulator is reduced in the desired manner via the pressure reduction device.
  • two, in particular identically designed pressure amplification devices are provided, which are independently controllable.
  • Such a design has the advantage that it operates particularly reliably or, in the event of a malfunction in a pressure-increasing device, the pressure can be maintained at least at a certain level by means of the second pressure-increasing device.
  • a hydraulic system 1 designed as a fuel injection system 10 is shown.
  • the fuel injection system 10 is used in particular in a self-igniting internal combustion engine 2, in particular a diesel engine, which has a plurality, for example six, of consumers designed as injectors 3 for injecting fuel into the combustion chambers of the internal combustion engine 2.
  • Such, known per se fuel injection system 10 has (among other components, not shown for clarity, such as a fuel filter, a water separator, etc., which are usually present in practice, but are not required for understanding the invention) a fuel tank 11th on, is conveyed from the fuel by means of a high-pressure feed pump 12 in a first high-pressure accumulator 13.
  • a high-pressure feed pump 12 By means of such, known from practice high-pressure feed pump 12, for example, a pressure of 1500 bar is generated in the first high-pressure accumulator 13.
  • the first high pressure accumulator 13 is equipped with an electrically controllable pressure control valve 14, which allows a backflow of fuel from the first high pressure accumulator 13 into the fuel tank 11 when a certain pressure in the first high pressure accumulator 13 is exceeded.
  • the pressure control valve 14 is connected to a control device, not shown, of the motor vehicle and electrically controlled by this, the e.g. at certain operating conditions, e.g. the shutdown of the internal combustion engine 2 or at a partial load operation of the internal combustion engine 2, the pressure in the first high pressure accumulator 13 down regulates.
  • the first high-pressure accumulator 13 is coupled to two pressure-increasing devices 17, 18 which are of identical design but can be operated independently of one another and are not shown in detail in the drawing.
  • the two pressure increasing devices 17, 18 are each coupled to a 3/2-control valve 19, 20.
  • the two outputs of the pressure increasing devices 17, 18 are in turn connected to a second high-pressure accumulator 22 for the fuel.
  • the second high-pressure accumulator 22 is designed as a so-called rail and has a pressure sensor 23. From the second high-pressure accumulator 22 in each case a line 24 goes to each of the injectors 3.
  • each injector 3 has a return line 16, which connects the injector 3 to the low pressure region 5 of the fuel injection system 1 and the unneeded fuel is returned to the fuel tank 11.
  • the two high-pressure accumulators 13 and 22 are coupled to one another with a pressure reduction device 25.
  • the pressure reduction device 25 is designed in particular as a mechanically operating, in particular spring-loaded differential pressure overflow valve 26.
  • the differential pressure overflow valve 26 has a connection line 27, via which, for example, leakage losses of the differential pressure overflow valve 26 can be diverted into a low-pressure region 5 of the fuel injection system 10.
  • the low-pressure region 5 is in turn connected to the fuel tank 11.
  • a connection 28 is provided in the differential pressure overflow valve 26, which allows the discharge of the differential pressure overflow valve 26, a drainage of fuel from the second high pressure accumulator 22 into the first high pressure accumulator 13.
  • the first pressure boosting device 17 has check valves 30, 31 which prevent a backflow of fuel from the second high-pressure accumulator 22 into the first pressure increasing device 17 or from the first pressure increasing device 17 into the first high-pressure accumulator 13.
  • the second pressure increasing device 18 check valves 33, 34, which prevents a backflow of fuel from the second high pressure accumulator 22 in the second pressure increasing means 18 and of the second pressure increasing means 18 in the first high pressure accumulator 13.
  • the control valve 20 In the in the Fig. 1 illustrated position of the two 3/2-control valves 19, 20, the control valve 20 is shown in the actuated position, in which the associated second pressure increasing means 18 is thus in the delivery phase of their cycle.
  • the pressure increasing device 18 in this case conveys a fuel quantity as a function of its geometric transmission ratio from the first high-pressure accumulator 13 into the second high-pressure accumulator 22.
  • the control valve 19, however, is shown in the unactuated position, in which the associated pressure booster 17 is in the filling phase of its cycle. Thanks to the spring force, it fills the high-pressure chamber of the pressure-increasing device 17 with fuel via the non-return valve 30 and returns to its initial state after complete filling, in which all volumes are at system pressure level.
  • the two pressure boosting devices 17, 18 are not actuated, wherein the two check valves 31, 34 are in their closed position. Since no or only a very small leakage occurs at the injectors 3, initially only a slight pressure reduction occurs in the second high-pressure accumulator 22.
  • the differential pressure relief valve 26 is closed due to its geometric pressure area ratio and the spring action (1st position). If the pressure in the first high-pressure accumulator 13 is now reduced by means of the pressure regulating valve 14 as a result of control via the control unit, the closing force at the differential pressure overflow valve 26 is also reduced and it can open (2nd position).
  • the pressure in the second high pressure accumulator 22 is reduced, since fuel from the second high pressure accumulator 22 via the connection 28 in the first high pressure accumulator 13 can flow.
  • the pressure in the second high-pressure accumulator 22 is lowered relatively quickly.
  • the pressure control valve 14 To rebuild the pressure in the second high pressure accumulator 22, the pressure control valve 14 must be closed again, wherein the pressure in the first high pressure accumulator 13 due to the promotion by means of the high pressure feed pump 12 increases again. In this case, the pressure increases until the force acting on the Differenzdrucküberströmventil 26 compressive force closes this and thus the connection between the two high-pressure accumulators 13, 22.
  • the gear ratios of the activated pressure increasing means 17, 18 determine the pressure ratio between the two high pressure accumulators 13, 22 and the differential pressure spill valve 26 by the pressure area ratio of the pressure ratio between the high pressure accumulators 13,22 in the pressure reduction.
  • the pressure area ratio of the differential pressure overflow valve 26 must be greater than the transmission ratios of the activated pressure increasing devices 17, 18, otherwise the differential pressure overflow valve 26 would also open during the delivery phase of the pressure increasing devices 17, 18, which adversely affects the efficiency.

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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. Système d'injection de carburant (10 ; 10a) pour un moteur à combustion interne (2) avec un système hydraulique (1), avec un dispositif de pompe (12) connecté à un premier accumulateur haute pression (13), qui refoule du fluide sous pression par augmentation de la pression dans le premier accumulateur haute pression (13), avec au moins un dispositif d'accroissement de la pression (17, 18) qui est accouplé au premier accumulateur haute pression (13) et qui refoule le fluide sous pression se trouvant dans le premier accumulateur haute pression (13), par augmentation supplémentaire de la pression, dans un deuxième accumulateur haute pression (22), au moins un consommateur (3) étant alimenté en fluide sous pression par le deuxième accumulateur haute pression (22), au moins un dispositif de soupape (31, 34) étant accouplé à l'au moins un dispositif d'accroissement de la pression (17, 18) entre les deux accumulateurs haute pression (13, 22), lequel dispositif d'accroissement de la pression empêche une sortie de fluide sous pression hors du deuxième accumulateur haute pression (22) dans la direction de l'au moins un dispositif d'accroissement de la pression (17, 18), le deuxième accumulateur haute pression (22) étant accouplé à un dispositif de réduction de la pression (25 ; 25a) au moyen duquel du fluide sous pression peut s'écouler hors du deuxième accumulateur haute pression (22), de telle sorte que la pression dans le deuxième accumulateur haute pression (22) soit réduite, le fluide sous pression étant du carburant et l'au moins un consommateur étant un injecteur (3) pour injecter du carburant dans une chambre de combustion du moteur à combustion interne (2),
    caractérisé en ce que
    le dispositif de réduction de la pression (25) est disposé entre les deux accumulateurs haute pression (13, 22) et du carburant reflue depuis le deuxième accumulateur haute pression (22) dans le premier accumulateur haute pression (13).
  2. Système d'injection de carburant selon la revendication 1, caractérisé en ce que le dispositif de réduction de la pression (25 ; 25a) est réalisé sous forme de soupape de débordement (26) pouvant être commutée entre deux positions.
  3. Système d'injection de carburant selon l'une quelconque des revendications 1 ou 2,
    caractérisé en ce que
    le dispositif de réduction de la pression (25 ; 25a), lors du dépassement d'un rapport de pression déterminé entre les deux accumulateurs haute pression (13, 22), ouvre l'évacuation du carburant hors du deuxième accumulateur haute pression (22).
  4. Système d'injection de carburant selon la revendication 3,
    caractérisé en ce que
    le premier accumulateur haute pression (13) est accouplé à une soupape de régulation de la pression (14) qui, dans une position ouverte, provoque un reflux de carburant dans la région basse pression (5).
  5. Système d'injection de carburant selon la revendication 4,
    caractérisé en ce que
    la soupape de régulation de la pression (14) peut être commandée électriquement par un dispositif de commande d'un véhicule automobile.
  6. Système d'injection de carburant selon l'une quelconque des revendications 2 à 5,
    caractérisé en ce que
    la soupape de débordement (26) est réalisée sous forme de soupape fonctionnant mécaniquement, en particulier sous forme de soupape sollicitée par ressort.
  7. Système d'injection de carburant selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que
    deux dispositifs d'accroissement de la pression (17, 18) notamment réalisés de manière identique sont prévus, lesquels peuvent être commandés indépendamment l'un de l'autre.
EP11151136.6A 2010-02-17 2011-01-17 Système hydraulique et système d'injection de carburant pour moteur à combustion interne Not-in-force EP2357354B1 (fr)

Applications Claiming Priority (1)

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DE102010002033A DE102010002033A1 (de) 2010-02-17 2010-02-17 Hydrauliksystem und Kraftstoffeinspritzsystem für eine Brennkraftmaschine

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EP2357354A2 EP2357354A2 (fr) 2011-08-17
EP2357354A3 EP2357354A3 (fr) 2015-12-23
EP2357354B1 true EP2357354B1 (fr) 2018-04-25

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Publication number Priority date Publication date Assignee Title
DE102016202916B4 (de) 2016-02-25 2021-07-29 Ford Global Technologies, Llc Verfahren eingerichtet zur Steuerung eines Kraftstoffzufuhrsystem für einen Verbrennungsmotor

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
DE4401083A1 (de) * 1994-01-15 1995-07-20 Daimler Benz Ag Für eine Brennkraftmaschine vorgesehene Kraftstoffeinspritzanlage
KR100580699B1 (ko) * 2003-10-27 2006-05-15 현대자동차주식회사 커먼 레일 시스템의 2중 제어장치
US7392791B2 (en) * 2006-05-31 2008-07-01 Caterpillar Inc. Multi-source fuel system for variable pressure injection
DE102007010495A1 (de) 2007-03-05 2008-09-11 Robert Bosch Gmbh Kraftstoffeinspritzsystem sowie Druckverstärkungseinrichtung für ein Kraftstoffeinspritzsystem
DE102007062176A1 (de) * 2007-12-21 2009-06-25 Robert Bosch Gmbh Druckregelventil zur Regelung des Drucks in einem Hochdruck-Kraftstoffspeicher
DE102008011677A1 (de) * 2008-02-28 2009-09-03 Robert Bosch Gmbh Prüfeinrichtung für ein Kraftstoffeinspritzsystem

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None *

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Publication number Publication date
DE102010002033A1 (de) 2011-08-18
EP2357354A2 (fr) 2011-08-17
EP2357354A3 (fr) 2015-12-23

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