EP1352174B1 - Systeme d'injection de carburant avec regulation de la pression dans la conduite de retour - Google Patents

Systeme d'injection de carburant avec regulation de la pression dans la conduite de retour Download PDF

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Publication number
EP1352174B1
EP1352174B1 EP01990323A EP01990323A EP1352174B1 EP 1352174 B1 EP1352174 B1 EP 1352174B1 EP 01990323 A EP01990323 A EP 01990323A EP 01990323 A EP01990323 A EP 01990323A EP 1352174 B1 EP1352174 B1 EP 1352174B1
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel
return line
pump
valve
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
EP01990323A
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German (de)
English (en)
Other versions
EP1352174A1 (fr
Inventor
Peter Schueler
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1352174A1 publication Critical patent/EP1352174A1/fr
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Publication of EP1352174B1 publication Critical patent/EP1352174B1/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
    • 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
    • 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
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0029—Pressure regulator in the low pressure fuel system
    • 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
    • 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
    • F02M37/0076—Details of the fuel feeding system related to the fuel tank
    • F02M37/0088—Multiple separate fuel tanks or tanks being at least partially partitioned
    • F02M37/0094—Saddle tanks; Tanks having partition walls
    • 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
    • F02M37/02—Feeding by means of suction apparatus, e.g. by air flow through carburettors
    • F02M37/025—Feeding by means of a liquid fuel-driven jet pump
    • 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
    • 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
    • F02M69/54—Arrangement of fuel pressure regulators
    • 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
    • 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
    • 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
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • F02M37/106—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir the pump being installed in a sub-tank

Definitions

  • the invention relates to a fuel injection system for internal combustion engines, with a high-pressure fuel pump, with a common rail, with at least one injector, with a prefeed pump, wherein the high-pressure fuel pump or the injectors supplied via the common rail with fuel, with a control of the delivery pressure of the prefeed pump , with a return line for the removal of fuel from the injector and / or the high-pressure fuel pump and with a pressure control in the return line.
  • the performance of injectors, the common-rail pressure control, and the common rail fuel injection system high-pressure fuel pump depend, inter alia, on their performance. a. from the back pressure in the return line. Therefore, in the known fuel injection systems, the pressure in the return line is regulated by pressure retaining valves inserted into the return line (see for example document DE 198 45 556 A) or a pressure limiting valve connected in parallel to a tank jet pump in the fuel tank. These pressure controls are dependent on the ambient pressure and the fuel return, which in turn depends on the operating point of the internal combustion engine.
  • the invention has for its object a pressure control to provide in the return line with improved control quality.
  • a fuel injection system for internal combustion engines with a high-pressure fuel pump, with a common rail, with at least one injector, with a prefeed pump, the high-pressure fuel pump or the injectors supplied via the common rail with fuel, with a prefeed pump, the fuel from a tank to the high-pressure fuel pump, with a control of the delivery pressure of the feed pump, with a return line for removing fuel from the injector and / or the high-pressure fuel pump and with a pressure control in the return line wherein the pressure in the return line in dependence Delivery pressure of the feed pump is regulated.
  • the pressure maintenance in the return line is improved by using the feed pressure of the pre-feed pump as the reference value for the pressure control of the return line. Since the delivery pressure of the pre-supply pump is controlled, the control quality of the pressure in the return line is improved.
  • the delivery pressure of the prefeed pump is regulated to an absolute value, so that the regulation of the pressure in the return line is also independent of the ambient pressure and thus a further improvement of the control quality is achieved.
  • the prefeed pump is arranged in the tank, that in the tank a tank jet pump for filling a Schwelltopfs is provided, and that the tank jet pump is driven by the return line.
  • the prefeed pump is driven independently of the high-pressure fuel pump and thus can be better controlled.
  • the pressure in the pressure range of the prefeed pump is kept better constant, which has an advantageous effect on the control quality of the pressure in the return line.
  • the pressure regulating valve has at least one inlet, one outlet and a control pressure connection and the control pressure connection is hydraulically connected to the pressure side of the prefeed pump, so that the control quality of the pressure in the return line is improved in accordance with the invention.
  • the pressure control valve is designed as a slide valve, that one end face of the slide is acted upon by the delivery pressure of the prefeed that act on a second end face of the slide, the pressure of the return line and the force of a Regelelfeder.wirk and is released as a function of the position of the slide, the flow of the pressure control valve, so that in a simple way, the pressure in the return line is controlled. Because of the sensitive response of slide valves results in a particularly high quality control.
  • the pressure control valve is designed as a seat valve with a membrane and a valve body that a first side of the membrane is acted upon by the delivery pressure of the prefeed pump, that also a second side of the membrane, the pressure of the return line and the Acting force of a control spring and that depending on the Position of the diaphragm of the valve body is lifted for a valve seat and the flow of the pressure control valve is released, so that because of the size of the diaphragm even the smallest pressure changes trigger a control process and thus a high control quality is achieved.
  • valve body can be embodied as a ball or valve cone, so that the specific advantages of these valve bodies can also be utilized for a fuel injection system according to the invention.
  • a high-pressure fuel pump 1 not is explained in more detail, promotes fuel in a common rail 3. From the common rail 3 injectors, not shown, are supplied via connecting lines 5 with fuel. The pressure in the common rail 3 is controlled by a pressure-holding valve 7.
  • the high-pressure fuel pump 1 is supplied from a tank 9 with a Schwelltopf 11, a plurality of tank jet pumps 13, a pre-filter 15, a check valve 17 and an electric feed pump 19 via a supply line 21 with fuel.
  • a fuel filter 23 with a water separator and an absolute pressure sensor 25 is installed in the supply line 21 .
  • the measured values of the absolute pressure sensor 25 are transmitted to an unillustrated control unit which, depending on the pressure measured in the supply line 21, activates the prefeed pump 19 in such a way that a constant absolute pressure prevails in the supply line 21.
  • the supply line 21 is acted upon by the delivery pressure of the prefeed pump 19.
  • the tank jet pumps 13 are driven by the fuel, which flows back into the tank 9 via a return line 27 from the common rail 3 and the leakage lines 29 of the injectors, not shown.
  • the return line 27 is divided by a pressure regulating valve 31 into two sections 27a and 27b.
  • a pressure regulating valve 31 For the function of the injectors, not shown, and the high-pressure fuel pump 1, it is important that the pressure in the section 27a of the return line 27 is constant.
  • the pressure control valve 31 is formed in the embodiment of Figure 1 as a slide valve.
  • a slide 33 is acted upon on its first end face 35 via a connecting line 37 with the pressure in the supply line 21, which corresponds to the delivery pressure of the prefeed pump 19.
  • the Connecting line 37 opens into a control pressure port of the pressure control valve 31.
  • an inlet 41 is provided in which the section 27a of the return line opens. That is, a second end face 43 of the slider 33 is acted upon by the pressure of the fuel in the section 27 a of the return line 27.
  • the pressure in the section 27 a is thus determined essentially by the flow resistance of the pressure control valve 31 and the tank jet pumps 13. Because of the ambient pressure-dependent flow resistance of the tank jet pumps 13 thus results in a slight proportional characteristic of the pressure in section 27a of the return line.
  • the pressure control valve 31 is shown in a control position. For reasons of clarity, not all components of the pressure regulating valve have been provided with reference numerals.
  • the slide 33 shown in FIG. 2 closes the drain 47 partially on its second end face 43.
  • the slider 33 is raised by acting on its first end face 35 control pressure from the supply line 21 against the force of the control spring 45 and the pressure on the second end face 43. This increases the flow resistance of the pressure regulating valve 31 with respect to the rest position shown in FIG.
  • inlet 41 and outlet 47 are arranged opposite one another.
  • the slide 33 has an annular groove 48, which releases in the rest position, as shown in Figure 3, inlet 41 and outlet 47 more or less.
  • the pressure of the portion 27 a of the return line is guided via a separate control line 49 in the space bounded by the second end face 43 of the slider 33 space.
  • Inlet 41 and outlet 47 can also be arranged slightly offset from one another, so that first, for example, the inlet of the annular groove 48 is released and then the sequence 47 is released. By this measure, the performance of the pressure control valve 31 can be influenced.
  • FIG. 4 shows a pressure regulating valve 31 designed as a diaphragm valve.
  • a membrane 51 divides the space enclosed by a housing 53 into two subspaces.
  • a first side 55 of the membrane 51 is acted upon via the control pressure port 39 with the pressure in the supply line 21, or the delivery pressure of the prefeed pump 1 (both not shown).
  • On a second side 57 of the membrane act a control spring 45 and the pressure of the fuel, which flows in the inlet 41.
  • a ball valve body 59 which is held in an insert 61 of the diaphragm 51, pressed against a valve seat 63, which closes the drain 47.
  • the inlet 41 is, as can be seen from Figures 1 to 3, connected to the first portion 27a of the return line.

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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)

Abstract

L'invention concerne un système d'injection de carburant à rampe commune selon lequel la pression d'une conduite de retour (27) est régulée en fonction de la pression d'alimentation d'une pompe de pré-alimentation (19). Ainsi, il est possible d'améliorer le comportement de fonctionnement d'une pompe à carburant haute pression (1) et des injecteurs non représentés alimentés en carburant par l'intermédiaire d'une rampe commune (3). La régulation de la pression de la conduite de retour (27) est effectuée par l'intermédiaire d'une soupape de régulation de pression (31).

Claims (7)

  1. Installation d'injection de carburant pour moteurs à combustion interne, comprenant
    - une pompe haute pression à carburant (1),
    - une rampe commune (3),
    - au moins un injecteur, la pompe haute pression à carburant (1) alimentant en carburant le ou les injecteur(s) via la rampe commune (3),
    - une pompe de préalimentation (19) qui achemine du carburant hors d'un réservoir (9) jusqu'à la pompe haute pression à carburant (1),
    - une régulation de pression de la pression d'alimentation de la pompe de préalimentation (19),
    - une conduite de retour (27) pour l'évacuation du carburant hors du ou des injecteur(s) et/ou de la pompe haute pression à carburant (1), et
    - une régulation de pression dans la conduite de retour (27),

    caractérisée en ce que
    la pression dans la conduite de retour (27) est réglée en fonction de la pression d'alimentation de la pompe de préalimentation (19).
  2. Installation d'injection de carburant selon la revendication 1,
    caractérisée en ce que
    la pression d'alimentation de la pompe de préalimentation (19) est réglée à une valeur absolue.
  3. Installation d'injection de carburant selon la revendication 1 ou 2,
    caractérisée en ce que
    la pompe de préalimentation (19) est disposée dans le réservoir (9),
    au moins une pompe auto-aspirante de réservoir (13) est prévue dans le réservoir (9) pour le remplissage d'une boîte (11), et
    au moins une pompe d'injection de réservoir (13) est entraînée par le carburant s'écoulant dans la conduite de retour (27).
  4. Installation d'injection de carburant selon l'une des revendications précédentes,
    caractérisée en ce que
    la soupape de régulation de pression (31) de la conduite de retour (27) présente au moins une arrivée (41), une évacuation (47) et un raccord de pression de commande (39), et
    le raccord de pression de commande (39) est en liaison hydraulique avec le côté pression de la pompe de préalimentation (1).
  5. Installation d'injection de carburant selon la revendication 4,
    caractérisée en ce que
    la soupape de régulation de pression (31) est configurée sous forme de distributeur à tiroir,
    une première face frontale (35) du tiroir (33) est soumise à la pression d'alimentation de la pompe de préalimentation (19),
    sur une deuxième face frontale (43) du tiroir (33) agissent la pression de la conduite de retour (27a) et la force d'un ressort de réglage (45), et
    en fonction de la position du tiroir (33), l'évacuation (47) de la soupape de régulation de pression (31) est débloquée.
  6. Installation d'injection de carburant selon la revendication 4,
    caractérisée en ce que
    la soupape de régulation de pression (31) est une soupape à siège dotée d'une membrane (51) et d'un corps de soupape (59),
    un premier côté (55) de la membrane (51) est soumis à la pression d'alimentation de la pompe de préalimentation (19),
    sur un deuxième côté (57) de la membrane (51) agissent la pression de la conduite de retour (27a) et la force d'un ressort de réglage (45), et
    en fonction de la position de la membrane (51), le corps de soupape (59) est soulevé d'un siège de soupape (63) et l'évacuation (47) de la soupape de régulation de pression (31) est débloquée.
  7. Installation d'injection de carburant selon la revendication 6,
    caractérisée en ce que
    le corps de soupape (59) est une bille ou un cône de soupape.
EP01990323A 2001-01-10 2001-12-19 Systeme d'injection de carburant avec regulation de la pression dans la conduite de retour Expired - Lifetime EP1352174B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10100700A DE10100700C1 (de) 2001-01-10 2001-01-10 Kraftstoffeinspritzsystem mit Druckregelung in der Rücklaufleitung
DE10100700 2001-01-10
PCT/DE2001/004795 WO2002055873A1 (fr) 2001-01-10 2001-12-19 Systeme d'injection de carburant avec regulation de la pression dans la conduite de retour

Publications (2)

Publication Number Publication Date
EP1352174A1 EP1352174A1 (fr) 2003-10-15
EP1352174B1 true EP1352174B1 (fr) 2006-02-01

Family

ID=7670058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01990323A Expired - Lifetime EP1352174B1 (fr) 2001-01-10 2001-12-19 Systeme d'injection de carburant avec regulation de la pression dans la conduite de retour

Country Status (6)

Country Link
US (1) US6729309B2 (fr)
EP (1) EP1352174B1 (fr)
JP (1) JP4083015B2 (fr)
KR (1) KR100828224B1 (fr)
DE (2) DE10100700C1 (fr)
WO (1) WO2002055873A1 (fr)

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WO2002055873A1 (fr) 2002-07-18
US6729309B2 (en) 2004-05-04
JP4083015B2 (ja) 2008-04-30
JP2004517260A (ja) 2004-06-10
DE50108872D1 (de) 2006-04-13
DE10100700C1 (de) 2002-08-01
KR20020077529A (ko) 2002-10-11
US20030111050A1 (en) 2003-06-19
EP1352174A1 (fr) 2003-10-15
KR100828224B1 (ko) 2008-05-07

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