WO1999043941A2 - Dosage de l'admission de carburant d'une pompe diesel utilisant une soupape de commande proportionnelle - Google Patents

Dosage de l'admission de carburant d'une pompe diesel utilisant une soupape de commande proportionnelle Download PDF

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Publication number
WO1999043941A2
WO1999043941A2 PCT/US1999/004139 US9904139W WO9943941A2 WO 1999043941 A2 WO1999043941 A2 WO 1999043941A2 US 9904139 W US9904139 W US 9904139W WO 9943941 A2 WO9943941 A2 WO 9943941A2
Authority
WO
WIPO (PCT)
Prior art keywords
control valve
fuel
pressure
fuel pump
inlet
Prior art date
Application number
PCT/US1999/004139
Other languages
English (en)
Other versions
WO1999043941A3 (fr
Inventor
Ilija Djordjevic
Original Assignee
Stanadyne Automotive Corp.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stanadyne Automotive Corp. filed Critical Stanadyne Automotive Corp.
Publication of WO1999043941A2 publication Critical patent/WO1999043941A2/fr
Publication of WO1999043941A3 publication Critical patent/WO1999043941A3/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • F02D41/3854—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped with elements in the low pressure part, e.g. low pressure 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
    • 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
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped

Definitions

  • the present invention pertains to high pressure fuel injection pumps.
  • the invention is particularly applicable to fuel injection pumps for supplying diesel fuel at high pressure to an accumulator of a common rail fuel injection system for a diesel engine.
  • fuel from a fuel tank can be pre-metered into the pumping chamber of a piston-type fuel injection pump.
  • This allows control of the volume of fuel delivered to the pumping chamber such that essentially all of the fuel delivered during a given charging phase is discharged at high pressure.
  • This metering may be accomplished with a valve connected in series between the fuel tank and the fuel injection pump.
  • the valve may be under the control of, for example, an electronic control unit which is responsive to a number of system variables which affect the desired output of the fuel injection pump.
  • the use of an electronic control unit in combination with a control valve in series with the fuel injection pump allows a rough control over the amount of fuel sent to the fuel injection pump. In turn, this control reduces the energy wasted by pumping unneeded fuel to the high pressure accumulator and also reduces the return of heated fuel to the fuel tank.
  • a proportional bypass control valve fluidly connected to the fuel inlet line such that the pressure difference between the transfer pump and the pumping chamber of the fuel injection pump can be varied within a range, for example, between about zero and ten bar.
  • the bypass control valve When the bypass control valve is opened, the fuel inlet line is fluidly connected to a return line at essentially zero pressure. Thus, the pressure in the fuel inlet line is reduced and all of the flow from the feed pump is bypassed and returned to the fuel tank.
  • the control valve is fully closed, the fuel inlet line is at maximum pressure and the maximum flow from the feed pump is delivered to the pumping chamber.
  • control valve is determined by an electronic control unit, thereby effectuating a closed control scheme for inlet metering.
  • the control valve has a plurality of positions between the fully closed and fully opened position, allowing a plurality of pressures, and thereby flows, to the high pressure fuel injection pump.
  • the high pressure fuel injection pump may comprise a check valve fluidly connecting the inlet delivery line to the pumping chamber.
  • the check valve has a closed position preventing flow therethrough and an open position allowing flow therethrough.
  • the check valve is biased toward the closed position such that a preload closure pressure must be overcome to actuate the check valve from the closed position to the open position.
  • the bypass control valve moves through intermediate positions between fully opened and fully closed, the pressure in the fuel inlet line increases. As long as the fuel inlet line pressure is below the preload closure pressure, fuel continues to be routed to the fuel tank.
  • the bypass control valve transitions through an intermediate position whereby the fuel inlet line pressure rises above the preload closure pressure, the check valve moves toward an open position and fuel is introduced into the fuel pump pumping chamber.
  • Figure 1 is a schematic diagram of a fuel injection system with a remote supply pump incorporating the parallel control valve of the present invention
  • Figure 2 is a schematic diagram of a fuel injection system incorporating a fuel supply pump driven off of the high pressure fuel pump and including the parallel control valve of the present invention
  • Figure 3 is a schematic representation of a fuel injection system similar to that of Figure 2 incorporating two control valves in series with each other and both in parallel with the high pressure fuel pump inlet.
  • a fuel source line 2 has one end immersed in the fuel tank 4 and the other end is connected to a supply pump 6.
  • the pump may be, for example, a gear pump which is driven off the vehicle engine. Alternatively, the fuel pump may be powered independently of the vehicle engine.
  • the supply pump discharges the fuel at a pressure, for example, ten bar.
  • the fuel is discharged from the supply pump 6 through a fuel filter 8 and then a flow restrictor 10.
  • the flow restrictor assures that the maximum quantity of fuel supplied to the pumping chamber is not excessive in view of the relatively high pumping volume of a typical gear pump.
  • a fuel inlet line 12 has a first end fluidly connected to the flow restrictor 10 and an opposing second end. The second end is connected in parallel to the control valve 14 and high pressure fuel pump inlet 16.
  • the control valve 14 includes an outlet 22 fluidly connected to a return line 18 which may return to, for example, the fuel tank.
  • a return line 18 which may return to, for example, the fuel tank.
  • the control valve inlet 20 and outlet 22 are fluidly connected and when the control valve is in the closed position, the inlet and outlet are completely separated. If the control valve is of the proportional type, positions between the open and closed positions may be achieved.
  • the high pressure fuel pump, generally 24 and shown within the dashed lines, may be of any type. As an example, the fuel pump described is of the internally actuated-externally pumping type although different fuel pump types may also be used.
  • the example fuel pump uses a piston 26 reciprocating within a pumping chamber 28 which is connected to both an inlet 30 and outlet 32 check valve.
  • the inlet check valve 30 is fluidly disposed between the high pressure fuel pump inlet 16 and the pumping bore 29.
  • the pumping bore, in cooperation with the plunger 26 comprises a pumping chamber 29.
  • the outlet check valve 32 is fluidly disposed between the pumping chamber 28 and a high pressure accumulator 34.
  • the inlet check valve typically has a preload closure pressure of about one bar. This preload closure pressure must be overcome by pressure in the fuel inlet line in order for fuel to be delivered into the pumping chamber 28. Therefore, if the control valve 14 is fully opened, exposing the fuel inlet line 12 to the essentially zero pressure in the return line 18, the pressure in the fuel inlet line will be reduced below the preload closure pressure of the inlet check valve 30.
  • ECU electronice control unit
  • the present figure shows an internally actuated, externally pumping, high pressure fuel supply pump
  • the present invention is also applicable to other high pressure fuel injection pump designs.
  • a person skilled in the art could apply the present invention to a high pressure fuel injection pump of the externally driven, internally pumping variety.
  • Figure 2 schematically illustrates a different embodiment of the invention.
  • the supply pump 48 is not a gear pump, but could be a smaller volume piston-type pump which is driven from the same shaft which drives the high pressure fuel injection pump.
  • a flow restrictor is not needed in the inlet line 12, because the inlet volumes are compatible with the needs of the pumping chamber.
  • the invention is similar to that described with respect to Figure 1.
  • a plurality of control valves can be arranged to simultaneously influence the pressure in the inlet line 12. This affords a greater degree of control than is available with a single control valve.
  • two control valves 14A, 14B are arranged in series to provide an increased range of control. This also accommodates a higher volume of fuel delivery from high capacity supply pumps.
  • the valves 14A, 14B are incorporated within the high pressure fuel injection pump 24, which in Figure 3 is denoted by the dash line. While not shown, the control valves 14A, 14B may both be arranged in parallel with the fuel inlet line 12.
  • the invention can be viewed as a method and apparatus for metering fuel flowing in a fuel inlet line between a supply pump and a high pressure pumping chamber.
  • the metering is accomplished as a result of the control of pressure within the fuel inlet line by a valve which is fluidly connected to, but not in line with, the fuel inlet line.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

La présente invention concerne un procédé et un système permettant de doser l'arrivée de carburant dans une pompe à carburant sous haute pression. Ce procédé fait varier la pression de l'arrivée de carburant alimentant la pompe à carburant sous haute pression. Par ailleurs, ce système utilise une soupape de commande disposée dans le circuit d'admission en parallèle avec le carburant sous haute pression pour faire varier la pression de l'arrivée de carburant alimentant la pompe à carburant sous haute pression.
PCT/US1999/004139 1998-02-27 1999-02-25 Dosage de l'admission de carburant d'une pompe diesel utilisant une soupape de commande proportionnelle WO1999043941A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7627298P 1998-02-27 1998-02-27
US60/076,272 1998-02-27

Publications (2)

Publication Number Publication Date
WO1999043941A2 true WO1999043941A2 (fr) 1999-09-02
WO1999043941A3 WO1999043941A3 (fr) 1999-10-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/004139 WO1999043941A2 (fr) 1998-02-27 1999-02-25 Dosage de l'admission de carburant d'une pompe diesel utilisant une soupape de commande proportionnelle

Country Status (1)

Country Link
WO (1) WO1999043941A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2826064A1 (fr) * 2001-06-19 2002-12-20 Denso Corp Systeme d'alimentation en carburant pour carburant de remplacement
WO2003069145A1 (fr) * 2002-02-13 2003-08-21 Robert Bosch Gmbh Systeme d'injection de carburant pour un moteur a combustion interne
CN101929394A (zh) * 2009-06-17 2010-12-29 株式会社电装 燃料状态感测装置
WO2011067008A1 (fr) * 2009-12-02 2011-06-09 Robert Bosch Gmbh Dispositif d'injection de carburant avec réglage de la quantité différentielle sur une pompe de pré-alimentation électrique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4884545A (en) * 1987-07-08 1989-12-05 Iveco Fiat S.P.A. Fuel injection system for an internal combustion engine
US5191867A (en) * 1991-10-11 1993-03-09 Caterpillar Inc. Hydraulically-actuated electronically-controlled unit injector fuel system having variable control of actuating fluid pressure
US5727525A (en) * 1995-10-03 1998-03-17 Nippon Soken, Inc. Accumulator fuel injection system
US5738075A (en) * 1994-07-29 1998-04-14 Caterpillar Inc. Hydraulically-actuated fuel injector with direct control needle valve
US5884606A (en) * 1995-12-29 1999-03-23 Robert Bosch Gmbh System for generating high fuel pressure for a fuel injection system used in internal combustion engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4884545A (en) * 1987-07-08 1989-12-05 Iveco Fiat S.P.A. Fuel injection system for an internal combustion engine
US5191867A (en) * 1991-10-11 1993-03-09 Caterpillar Inc. Hydraulically-actuated electronically-controlled unit injector fuel system having variable control of actuating fluid pressure
US5738075A (en) * 1994-07-29 1998-04-14 Caterpillar Inc. Hydraulically-actuated fuel injector with direct control needle valve
US5727525A (en) * 1995-10-03 1998-03-17 Nippon Soken, Inc. Accumulator fuel injection system
US5884606A (en) * 1995-12-29 1999-03-23 Robert Bosch Gmbh System for generating high fuel pressure for a fuel injection system used in internal combustion engines

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2826064A1 (fr) * 2001-06-19 2002-12-20 Denso Corp Systeme d'alimentation en carburant pour carburant de remplacement
US6805105B2 (en) 2001-06-19 2004-10-19 Denso Corporation Fuel supply system for alternative fuel
WO2003069145A1 (fr) * 2002-02-13 2003-08-21 Robert Bosch Gmbh Systeme d'injection de carburant pour un moteur a combustion interne
CN101929394A (zh) * 2009-06-17 2010-12-29 株式会社电装 燃料状态感测装置
WO2011067008A1 (fr) * 2009-12-02 2011-06-09 Robert Bosch Gmbh Dispositif d'injection de carburant avec réglage de la quantité différentielle sur une pompe de pré-alimentation électrique
CN102770658A (zh) * 2009-12-02 2012-11-07 罗伯特·博世有限公司 具有用于电动预输送泵的量差控制的燃料喷射装置
CN102770658B (zh) * 2009-12-02 2015-01-28 罗伯特·博世有限公司 具有用于电动预输送泵的量差控制的燃料喷射装置

Also Published As

Publication number Publication date
WO1999043941A3 (fr) 1999-10-07

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