WO1999011924A1 - Systeme pour la production de haute pression - Google Patents

Systeme pour la production de haute pression Download PDF

Info

Publication number
WO1999011924A1
WO1999011924A1 PCT/DE1998/002315 DE9802315W WO9911924A1 WO 1999011924 A1 WO1999011924 A1 WO 1999011924A1 DE 9802315 W DE9802315 W DE 9802315W WO 9911924 A1 WO9911924 A1 WO 9911924A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
pressure pump
pump
control valve
fuel
Prior art date
Application number
PCT/DE1998/002315
Other languages
German (de)
English (en)
Inventor
Martin Hartz
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO1999011924A1 publication Critical patent/WO1999011924A1/fr

Links

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
    • 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
    • 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
    • F04B49/24—Bypassing
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/15—By-passing over the pump
    • F04B2205/151—Opening width of a bypass valve

Definitions

  • the invention relates to a system for high pressure generation as e.g. can be used for generating high fuel pressure in a fuel injection system of an internal combustion engine, in particular in a common rail injection system, with a high pressure pump and with a
  • Pressure control valve on the delivery side of the high-pressure pump which opens when a threshold pressure is reached, so that the quantity delivered by the high-pressure pump is drained off via a return line.
  • a high-pressure pump directly driven by the engine delivers fuel depending on the engine speed, regardless of how much fuel is currently required or is to be injected by the engine.
  • the excess fuel that is not required is drained into the tank via the pressure control valve via a return line.
  • the high-pressure pump In order to ensure the proper operation of the internal combustion engine, the high-pressure pump must be designed in such a way that it can operate even under the most unfavorable conditions, i.e. at low Speed, high requested injection quantity, exceptionally high or low temperatures can provide the desired pressure and the desired volume flow. Under normal conditions, the volume flow of the pump is too high, ie the amount of fuel delivered per unit of time is too high.
  • Fuel return lines or a plastic tank Furthermore, there is a deterioration in the electrical data of injectors and the pressure control valve.
  • a pressure reduction in a pressure accumulator connected on the delivery side of the high pressure pump is easily possible by setting a lower set pressure on the pressure control valve (the pressure control valve then opens automatically until the set pressure is reached).
  • a delivery rate reduction by switching off a pump element leads to high pressure fluctuations and is therefore also not a viable option.
  • the object of the present invention is to counteract the problems described at the outset and to improve a system for high-pressure generation of the type described at the outset in such a way that in
  • the delivery rate of the high pressure pump can be reduced in a simple manner.
  • This object is achieved according to the invention in a system of the type described in the introduction in that the return flow of the pressure control valve interacts with a blocking or throttling device in such a way that the delivery volume of the high-pressure pump is reduced by the pressure control valve as the quantity discharged increases.
  • the blocking device is preferably provided on the suction side of the high-pressure pump, so that the pump inlet can be automatically closed by the blocking device as the return flow increases.
  • the delivery rate control is achieved in that, with an increasing return amount, an increasing pressure is built up in a return line of the pressure control valve, which is applied to the blocking device and actuates the latter in such a way that the delivery rate of the high-pressure pump is reduced.
  • the pressure control valve on the delivery side of the high-pressure pump opens when a threshold pressure is reached and the pressure in the return line of the pressure valve is increased.
  • This pressure increase in the return line now causes in the shut-off device that the fuel supply to the high-pressure pump is throttled or increasingly closed depending on the pressure in the return line. If a higher quantity of fuel is requested again, the pressure control valve closes, with the result that the pressure in the return line drops and thereby the
  • Shut-off device increasingly releases the fuel supply to the high-pressure pump.
  • the locking device for reducing the delivery rate of the high pressure pump is preferably integrated in the high pressure pump.
  • the pressure control valve can also be integrated in the high-pressure pump.
  • system for high pressure generation can be used in a particularly advantageous manner as a system for generating high fuel pressure in a preferably time-controlled fuel injection system of an internal combustion engine.
  • the system according to the invention can be used in an injection system in which the fuel is injected into the cylinders by one injection valve each, the Injection valves are connected by a common fuel supply device in the form of a line or a high-pressure storage space which is under high pressure during operation and in which the injection can be triggered by an electrically actuated, if necessary hydraulically assisted device (e.g. common rail injection system).
  • a common fuel supply device in the form of a line or a high-pressure storage space which is under high pressure during operation and in which the injection can be triggered by an electrically actuated, if necessary hydraulically assisted device (e.g. common rail injection system).
  • a safety valve is arranged between a low-pressure pump and the high-pressure pump, which, when the pressure falls below a predeterminable pre-pressure
  • the blocking device is formed by the safety valve.
  • the safety valve is accordingly designed and connected to the return line, for example via a branch line, in such a way that an increase in pressure in the return line results in a reduction in the fuel supply to the high-pressure pump.
  • the return line in a further development of the invention opens on one side of a displaceable piston-like adjusting means of the shut-off device, the displacement of which causes an increasing opening or closing of a fuel supply opening to the high-pressure pump.
  • the displaceable piston-like actuating means is therefore preferably biased into an end position, so that when the pressure in the return line drops, the actuating means is automatically reset in a direction that clears the fuel supply opening.
  • shut-off device preferably comprises a second displaceable piston-like actuating means, which is acted upon on the one hand by the outlet of the low-pressure pump and on the other hand by a spring supported against the first displaceable piston-like actuating means, this is a particularly simple and functional self-regulating device System realized.
  • the first piston-like actuating means is in its end position and forms an abutment for the spring which is fixed to the housing.
  • the second piston-like adjusting means is pretensioned by the spring force in such a way that it allows an unthrottled fuel supply between the low-pressure pump and the high-pressure pump above a threshold pressure required to operate the high-pressure pump, in that a fuel supply opening to the high-pressure pump is preferably largely opened. If the demand for fuel is reduced and the pressure control valve on the delivery side of the high-pressure pump opens as a result, so that the pressure in the return line rises, the first displaceable piston-like actuating means becomes displaceable from its end position in the direction of the second
  • Adjustment means moved.
  • the spring between the two piston-like adjusting means is further tensioned, which leads to a change in the balance of forces on the second piston-like adjusting means, with the result that the latter closes the fuel supply opening to the high-pressure pump
  • Figure 1 is a schematic representation of a system for high-pressure fuel generation according to the invention.
  • FIG. 2 shows a further illustration of the system according to FIG.
  • FIG. 1 with a schematic representation of the shut-off device.
  • the figures show a common rail injection system.
  • a first intake line 4 leads to a low-pressure pump 6, which forms the backing pump to a high-pressure pump 8, by means of which fuel is pumped into a high-pressure storage space, the so-called rail, under a pressure of up to 2000 bar becomes.
  • a safety valve 10 is provided between the low-pressure pump 6 and the high-pressure pump 8 and is designed such that it opens the fuel supply to the high-pressure fuel pump 8 when the one supplied by the low-pressure pump 6
  • Admission pressure is above about 1 bar. If this admission pressure drops below 1 bar, the safety valve 10 shuts off the fuel supply to the high pressure pump 8.
  • a pressure control valve 14 is provided on the delivery side 12 (rail) of the high-pressure pump 8 and opens above a predetermined or predeterminable pressure on the delivery side 12. When the pressure control valve 14 is open, fuel which is not required or is not requested by the combustion process of the internal combustion engine is returned to the fuel tank 2 from the high pressure side 12 via a return line 17 which forms the return 16 and leads away from the pressure control valve 14 via a throttle opening 18 in the return line 17.
  • the return line 17 communicates in the flow direction upstream of the throttle opening 18 with the safety valve 10 in such a way that the fuel supply to the high-pressure pump 8 is increasingly closed as the pressure in the return line rises. As a result, however, the volume flow through the high-pressure pump 8, which is conveyed to the delivery side 12, is reduced. A small part of the fuel is also discharged or used by the safety valve 10 for lubricating the high-pressure pump 8 via a branch line 20.
  • the structure of the safety valve 10, which forms a shut-off device 22 which communicates with the return line 17 and regulates the fuel supply to the high-pressure pump 8, is shown in a basic manner from the illustration according to FIG.
  • the safety valve 10 or the shut-off device 22 comprises a first displaceable Piston 24 and a second displaceable piston 26, between which a compression spring 28 is provided, which biases the two pistons 24, 26 in opposite directions in their respective end positions.
  • the side of the piston 26 facing away from the spring 28 is acted upon by the fuel delivered by the low-pressure pump.
  • a throttle opening 30 is provided, which connects the inlet side of the safety valve 10 to the space 30 between the two pistons 24, 26 in which the spring 28 is arranged.
  • the branch line 20 mentioned in FIG. 1 leads from this space 30 to the high-pressure pump 8 for the purpose of supplying lubricant.
  • Fuel supply line 34 radially to the piston longitudinal direction away to the high-pressure pump 8.
  • the second piston 26 forms a control edge 36 such that, depending on the position of the piston 26 in the cylinder chamber 32, the supply line 34 is completely or only partially released and accordingly the fuel supply to the high-pressure pump is opened or throttled.
  • both pistons 24, 26 are in their respective end positions. If the
  • Low-pressure pump 6 delivers fuel and accordingly the pressure on the inlet side of the piston 26 rises, the piston 26 is pressed against the bias of the spring 28 in FIG. 2 to the right, that is to say in the direction of the first piston 24, so that the control edge 36 the fuel supply line 34 releases.
  • the high pressure pump 8 now delivers fuel into the rail.
  • the fuel supply to the high pressure pump 8 is increasingly closed. This reduces the delivery rate of the high pressure pump 8.
  • the system is self-regulating. If, after the pressure control valve 14 closes, the pressure in the return line 17 decreases again, the first piston 24 is again moved into the end position shown in FIG 8 shift releasing direction.
  • the high-pressure pump only delivers as much fuel as is required or requested by the internal combustion engine. The drive power of the pump and thus the
  • Fuel temperatures are reduced to a minimum.
  • the return line could cooperate with a control device for the eccentric stroke of the high-pressure pump in such a way that, as the pressure in the return line increases, the eccentric stroke of the piston in the high-pressure pump is reduced so that the amount of fuel delivered per time is reduced. Also with This inventive idea enables an advantageous automatic flow rate control of the high-pressure pump to be achieved.
  • the type of delivery control described by limiting the supply amount to the high-pressure pump as a function of the return amount of the pressure control valve to the tank provided on the delivery side of the high-pressure pump can be integrated into the pump in a structurally simple manner, since the pressure control valve in most high-pressure pumps for common-rail injection systems is already attached directly to the pump. All that is required is a slight change to the safety valve or shut-off device and a slightly modified line routing.

Landscapes

  • 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 pour la production de haute pression comportant une pompe haute pression (8) et une soupape de régulation de pression (14) sur le côté refoulement de celle-ci, laquelle soupape s'ouvre lorsqu'une pression de seuil est atteinte, de sorte que la quantité refoulée par la pompe haute pression (8) est évacuée par l'intermédiaire d'un circuit de retour (16). Ce système est caractérisé en ce que le circuit de retour (16) de la soupape de régulation de pression (14) coopère avec un système d'obturation (22) de telle manière qu'en cas de quantité de reflux croissante, le débit de la pompe haute pression (8) est réduit.
PCT/DE1998/002315 1997-09-03 1998-08-12 Systeme pour la production de haute pression WO1999011924A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997138502 DE19738502A1 (de) 1997-09-03 1997-09-03 System zur Hochdruckerzeugung
DE19738502.8 1997-09-03

Publications (1)

Publication Number Publication Date
WO1999011924A1 true WO1999011924A1 (fr) 1999-03-11

Family

ID=7841068

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1998/002315 WO1999011924A1 (fr) 1997-09-03 1998-08-12 Systeme pour la production de haute pression

Country Status (2)

Country Link
DE (1) DE19738502A1 (fr)
WO (1) WO1999011924A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100679211B1 (ko) * 1999-07-02 2007-02-07 로베르트 보쉬 게엠베하 내연기관에 연료를 공급하기 위한 개폐밸브를 갖는 고압펌프

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1308781B1 (it) 1999-07-02 2002-01-10 Elasis Sistema Ricerca Fiat Pompa ad alta pressione munita di valvola di intercettazione amovibileper l'alimentazione di combustibile ad un motore a combustione interna
DE10058674A1 (de) * 2000-11-25 2002-06-06 Bosch Gmbh Robert Verfahren, Computerprogramm und Steuer und/oder Regelgerät zum Betreiben einer Brennkraftmaschine
DE60126056T2 (de) * 2001-01-24 2007-07-12 Mikuni Corp. Kraftstoffzufuhrsystem
DE10131506A1 (de) * 2001-07-02 2003-01-23 Bosch Gmbh Robert Verfahren zum Betreiben einer Brennkraftmaschine insbesondere eines Kraftfahrzeugs
DE10254984A1 (de) * 2002-11-26 2004-06-03 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
JP2006132467A (ja) * 2004-11-08 2006-05-25 Mitsubishi Fuso Truck & Bus Corp コモンレール式燃料噴射装置
DE102010043755B4 (de) * 2010-11-11 2021-11-18 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine, Steuergerät sowie Brennkraftmaschine

Citations (4)

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Publication number Priority date Publication date Assignee Title
EP0299337A2 (fr) * 1987-07-08 1989-01-18 IVECO FIAT S.p.A. Système d'injection de carburant pour un moteur à combustion interne
DE19534051A1 (de) * 1995-09-14 1997-03-20 Bosch Gmbh Robert Verfahren zum Betrieb einer Kraftstoffeinspritzeinrichtung
DE19612412A1 (de) * 1996-03-28 1997-10-02 Rexroth Mannesmann Gmbh Regelung für ein Druckfluid-Versorgungssystem, insbesondere für den Hochdruck in einem Kraftstoff-Einspritzsystem
DE19618707A1 (de) * 1996-05-09 1997-11-20 Siemens Ag Verfahren und Vorrichtung zur Regelung eines Kraftstoffvolumenstromes

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
DE4401074B4 (de) * 1994-01-15 2007-01-18 Robert Bosch Gmbh Pumpenanordnung, insbesondere zur Förderung von Kraftstoff aus einem Vorratsbehälter zu einer Brennkraftmaschine
DE19549108A1 (de) * 1995-12-29 1997-07-03 Bosch Gmbh Robert System zur Kraftstoffhochdruckerzeugung für ein in Brennkraftmaschinen eingesetztes Kraftstoffeinspritzsystem

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0299337A2 (fr) * 1987-07-08 1989-01-18 IVECO FIAT S.p.A. Système d'injection de carburant pour un moteur à combustion interne
DE19534051A1 (de) * 1995-09-14 1997-03-20 Bosch Gmbh Robert Verfahren zum Betrieb einer Kraftstoffeinspritzeinrichtung
DE19612412A1 (de) * 1996-03-28 1997-10-02 Rexroth Mannesmann Gmbh Regelung für ein Druckfluid-Versorgungssystem, insbesondere für den Hochdruck in einem Kraftstoff-Einspritzsystem
DE19618707A1 (de) * 1996-05-09 1997-11-20 Siemens Ag Verfahren und Vorrichtung zur Regelung eines Kraftstoffvolumenstromes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100679211B1 (ko) * 1999-07-02 2007-02-07 로베르트 보쉬 게엠베하 내연기관에 연료를 공급하기 위한 개폐밸브를 갖는 고압펌프

Also Published As

Publication number Publication date
DE19738502A1 (de) 1999-03-04

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