EP0483301B1 - Kraftstoffversorgungssystem für eine brennkraftmaschine - Google Patents

Kraftstoffversorgungssystem für eine brennkraftmaschine Download PDF

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Publication number
EP0483301B1
EP0483301B1 EP91907440A EP91907440A EP0483301B1 EP 0483301 B1 EP0483301 B1 EP 0483301B1 EP 91907440 A EP91907440 A EP 91907440A EP 91907440 A EP91907440 A EP 91907440A EP 0483301 B1 EP0483301 B1 EP 0483301B1
Authority
EP
European Patent Office
Prior art keywords
fuel
supply system
return flow
flow rate
pressure
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
EP91907440A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0483301A1 (de
Inventor
Rainer Schillinger
Günther PLAPP
Stefan Graf
Nikolaus Benninger
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
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 EP0483301A1 publication Critical patent/EP0483301A1/de
Application granted granted Critical
Publication of EP0483301B1 publication Critical patent/EP0483301B1/de
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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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/065—Introducing corrections for particular operating conditions for engine starting or warming up for starting at hot start or restart
    • 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
    • F02D41/3082—Control of electrical fuel pumps
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/02—Fuel-injection apparatus characterised by being operated electrically specially for low-pressure fuel-injection
    • 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
    • F02M69/16—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors
    • F02M69/18—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors the means being metering valves throttling fuel passages to injectors or by-pass valves throttling overflow passages, the metering valves being actuated by a device responsive to the engine working parameters, e.g. engine load, speed, temperature or quantity of air

Definitions

  • the invention relates to a fuel supply system for an internal combustion engine with an electric fuel pump, a fuel pressure regulator and a fuel metering system.
  • DE-OS 36 08 522 also describes a fuel injection system with a specially designed pressure regulator, in which an additional spring can engage by means of an electromagnet, in order to thereby obtain a controllable fuel pressure depending on the operating range of the internal combustion engine.
  • U.S. Patent 4,791,905 discloses a so-called on-demand electromagnetic fuel pump.
  • signals relating to air throughput in the intake manifold, speed, pressure in the intake manifold, water temperature and battery voltage are processed in a control unit, which in turn determines the control of the fuel pump with and without a series resistor. This achieves a large delivery rate with a high fuel requirement and a corresponding reduction in the delivery rate with a lower fuel requirement depending on the operating parameters of the internal combustion engine.
  • US Pat. No. 3,822,677 shows a fuel pump control system with a variable energy supply for the fuel pump depending on the fuel requirement.
  • a fuel supply system in an internal combustion engine in which an electric fuel pump delivers fuel from the fuel tank to the fuel rail in the usual way.
  • a pressure regulator arranged in the fuel return line keeps the fuel pressure constant.
  • a controllable valve is present in the fuel return line between the pressure regulator and the fuel tank, which valve can be closed by a control device if the control device detects that low temperatures are present when the internal combustion engine is started and a so-called cold start occurs. By closing this valve in the return line, the fuel return is prevented and an increased pressure is established in the fuel rail, which remains built up until a transition to the normal operating condition is detected.
  • the disadvantage of this fuel supply system is that the fuel return line is completely blocked, so that excess fuel cannot get back into the tank.
  • the object of the invention is therefore to create a system with high flexibility.
  • the fuel supply system according to the invention for an internal combustion engine enables the provision of different amounts of fuel with different ones using relatively simple means
  • Fuel pressures in the individual operating states of the internal combustion engine In addition to efficient and fuel-oriented fuel delivery by the fuel pump, an ideal pressure curve is also achieved, in order to ensure an optimal fuel supply, especially during the starting event, even when the internal combustion engine is hot.
  • FIG. 1 shows an overview of a fuel supply system
  • FIG. 2 each shows a pressure regulator characteristic curve according to the prior art and according to the solution according to the invention
  • FIG. 3 shows a supplementary circuit for the fuel pressure regulator to achieve the desired pressure curve.
  • FIG. 1 shows a rough overview of a fuel supply system in an internal combustion engine with spark ignition.
  • the internal combustion engine itself is designated by 10, an air intake pipe by 11 and an exhaust pipe by 12.
  • An air flow meter 13 and a throttle valve 14 which can be actuated by an accelerator pedal 15.
  • An electrical control unit 20 receives signals from the air quantity sensor 13, from the speed sensor 16 and, if appropriate, further sensors and outputs signals on the output side both to a fuel pump 23 and to at least one electromagnetic injection valve 24.
  • the fuel pump 21 receives the fuel from a fuel tank 21 and conveys it to the injection valve 24.
  • a pressure regulator 25 downstream of the fuel pump 23 serves the Keep fuel pressure at a desired level. The fuel quantity conveyed by the fuel pump 23 and lying above the requirement then returns to the tank 21 via a return line.
  • FIG. 1 The overview of a fuel supply system shown in FIG. 1 corresponds in principle to the prior art.
  • Figure 2 shows two pressure regulator characteristics.
  • the characteristic curve according to FIG. 2a corresponds to that of the prior art.
  • the pressure curve is plotted against the amount of fuel.
  • the pressure control characteristic curve according to the prior art is designed in such a way that it remains at a specific setpoint PKsetpoint above the minimum flow rate Qmin.
  • FIG. 2b shows a modified pressure regulator characteristic curve with an essentially constant pressure value between the minimum and maximum value for the return flow and an increased fuel pressure in the event that the return flow rises above Q max .
  • the increased pressure value can be used to reduce the formation of vapor bubbles during a hot start.
  • the provision of an increased fuel pressure can also be expedient during the post-starting situation, particularly when there has been a hot starting situation. The same applies in the case of acceleration.
  • the demand control of the fuel pump is expediently carried out by means of a cyclical control, which is known as such from the prior art. They are used in normal operation to ensure that the return flow does not leave the interval limited by Q min and Q max .
  • the design of the fuel pressure regulator to achieve the desired pressure curve is not a problem for the person skilled in the art; the design of the pressure regulator is even simplified since the constant pressure interval no longer has to be as large.
  • the fuel pressure regulator can be designed in such a way that an increased fuel pressure occurs with an increasing return flow quantity. This can be achieved by appropriately dimensioning the individual parts of the pressure regulator, in particular the spring located in the pressure regulator or via the shape of the return line.
  • FIG. 3 finally shows a throttled return line from the pressure regulator 25 to the tank 21, a throttle 26 with a valve 27 connected in parallel being provided in the return line itself and this valve 27 being electromagnetically controllable from the control unit 20 of FIG. 1.
  • the variation of the return line known per se to the state of the art can be ideally supplemented with a demand control of the fuel pump in order to achieve an optimal fuel supply to the internal combustion engine in all operating conditions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Fuel-Injection Apparatus (AREA)
EP91907440A 1990-05-18 1991-04-18 Kraftstoffversorgungssystem für eine brennkraftmaschine Expired - Lifetime EP0483301B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4016055 1990-05-18
DE4016055A DE4016055A1 (de) 1990-05-18 1990-05-18 Kraftstoffversorgungssystem fuer eine brennkraftmaschine
PCT/DE1991/000315 WO1991018196A1 (de) 1990-05-18 1991-04-18 Kraftstoffversorgungssystem für eine brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0483301A1 EP0483301A1 (de) 1992-05-06
EP0483301B1 true EP0483301B1 (de) 1995-07-26

Family

ID=6406740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91907440A Expired - Lifetime EP0483301B1 (de) 1990-05-18 1991-04-18 Kraftstoffversorgungssystem für eine brennkraftmaschine

Country Status (4)

Country Link
EP (1) EP0483301B1 (ja)
JP (1) JP3224537B2 (ja)
DE (2) DE4016055A1 (ja)
WO (1) WO1991018196A1 (ja)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2711734B1 (fr) * 1993-10-29 1995-11-24 Renault Procédé de commande d'une pompe à carburant de moteur à combustion interne.
DE4344572C1 (de) * 1993-12-24 1995-04-27 Bosch Gmbh Robert Einrichtung zur Kraftstoffversorgung
DE4344775A1 (de) * 1993-12-28 1995-06-29 Technoflow Tube Systems Gmbh Kraftstoff-Versorgungssystem für ein Kraftfahrzeug mit Ottomotor
DE4344776A1 (de) * 1993-12-28 1995-06-29 Technoflow Tube Systems Gmbh Kraftstoff-Versorgungssystem für ein Kraftfahrzeug mit Ottomotor
JPH08109862A (ja) * 1994-10-11 1996-04-30 Nippondenso Co Ltd 燃料供給装置
WO1998027333A1 (en) * 1996-12-17 1998-06-25 Siemens Automotive Corporation Fuel supply system for a vehicle
DE19818421B4 (de) * 1998-04-24 2017-04-06 Robert Bosch Gmbh Kraftstoffversorgungsanlage einer Brennkraftmaschine
EP2096289A1 (en) 2008-02-29 2009-09-02 Magneti Marelli Powertrain S.p.A. Control method of an electronic injection fuel feeding system
JP5779936B2 (ja) * 2011-03-28 2015-09-16 トヨタ自動車株式会社 燃料供給システム
JP5827060B2 (ja) * 2011-08-01 2015-12-02 トヨタ自動車株式会社 圧力制御装置および燃料供給装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1576482A1 (de) * 1967-09-13 1970-05-06 Bosch Gmbh Robert Kraftstoffeinspritzanlage
US4747386A (en) * 1986-05-02 1988-05-31 Toyota Jidosha Kabushiki Kaisha Method and apparatus for augmenting fuel injection on hot restart of engine
EP0248411B1 (en) * 1986-06-03 1992-03-25 Mitsubishi Denki Kabushiki Kaisha Fuel pressure regulator
FR2612257B1 (fr) 1987-03-10 1989-06-09 Renault Circuit de carburant d'un systeme d'injection electronique pour moteur a combustion interne

Also Published As

Publication number Publication date
WO1991018196A1 (de) 1991-11-28
EP0483301A1 (de) 1992-05-06
JP3224537B2 (ja) 2001-10-29
DE4016055A1 (de) 1991-11-21
JPH05500099A (ja) 1993-01-14
DE59106084D1 (de) 1995-08-31

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