EP0419783A1 - Pompe à injection de combustible pour moteur à combustion interne - Google Patents

Pompe à injection de combustible pour moteur à combustion interne Download PDF

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Publication number
EP0419783A1
EP0419783A1 EP19900113629 EP90113629A EP0419783A1 EP 0419783 A1 EP0419783 A1 EP 0419783A1 EP 19900113629 EP19900113629 EP 19900113629 EP 90113629 A EP90113629 A EP 90113629A EP 0419783 A1 EP0419783 A1 EP 0419783A1
Authority
EP
European Patent Office
Prior art keywords
pump
fuel injection
fuel
signal box
interlocking
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.)
Ceased
Application number
EP19900113629
Other languages
German (de)
English (en)
Inventor
Alf Dr. Dipl.-Phys Loeffler
Helmut Dipl.-Ing. Laufer
Wolfgang Fehlmann
Eberhard Fiedler
Wolfgang Dipl.-Ing. Geiger
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 EP0419783A1 publication Critical patent/EP0419783A1/fr
Ceased legal-status Critical Current

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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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
    • F02D1/08—Transmission of control impulse to pump control, e.g. with power drive or power assistance
    • 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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
    • F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
    • F02M41/123—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor characterised by means for varying fuel delivery or injection timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention is based on a fuel injection pump for internal combustion engines according to the preamble of claim 1.
  • a fuel injection pump for internal combustion engines according to the preamble of claim 1.
  • the electrical quantity per pump piston stroke is fed to the injection nozzles by means of an electrical signal box and the amount of fuel that is injected into the cylinders of the internal combustion engine is precisely metered there. It has been shown that the accuracy with which the amount of fuel can be metered depends on the one hand on the constancy of the material properties of the fuel delivered, and on the other hand also on the functionality of the signal box.
  • the temperature of the fuel supplied to the injection nozzles is determined by a permanent fuel flow derived from the pump interior, the temperature of which in a known ratio to the temperature of the pump piston to the injection nozzles Fuel stands, is guided past a temperature sensor and its output signal is taken into account as a correction variable in the control variable supplied to the electrical signal box for actuating the quantity adjusting member.
  • the fuel injection pump according to the invention with the characterizing features of claim 1 has the advantage that the problem set out in the aforementioned prior art is solved in a safe manner.
  • the signal box comprising the electrical signal box has an adjacent flow channel, which is partially designed as a jet pump, which in turn is connected to the signal box via a suction hole.
  • FIG. 1 shows the first embodiment with the signal box still partially filled with fuel
  • FIG. 1a shows a jet pump arranged in the signal box as an enlarged detail of FIG. 1
  • FIG. 2 shows the second embodiment with a completely fuel-free signal box.
  • a pump housing 10 encloses a pump interior 11.
  • a signal box housing 12 separates the pump interior 11 from a signal box space 13, in which an electrical signal box 14 with a, a material measure for the fuel metering Fuel injection pump forming potentiometer 9 is arranged.
  • the interlocking housing 12 is formed in two parts and consists of a shell-shaped basic housing 16 with a partition 15 adjoining the pump interior 11, which is sealed in a liquid-tight manner with respect to the pump interior 11, and of a cover 17 which closes the basic housing 16 and is screwed into the basic housing 16 Service purposes can be accepted.
  • the basic housing 16 has a recess 18 on the partition 15, in which a bushing 19 designed as a sliding bushing is inserted as part of the partition 15.
  • the socket 19 extends into the pumps interior 11.
  • An actuating shaft 21 with play is passed through the bushing 19, so that a bearing gap is formed between the actuating shaft and the inside of the bushing 19, which forms a throttle point 22 between the pump interior 11 and the interlocking space 13.
  • the fuel is at a delivery pressure of approx. 3-8 bar.
  • the pressure level in the signal box 13 is lower. Due to this pressure difference, a small amount of fuel flows as a leakage flow from the pump interior 11 into the signal box space 13 via the throttle point 22.
  • the actuating shaft 21, actuated by the interlocking 14, positions a quantity adjusting member, which is no longer shown, via an eccentric 23 which projects into the front face of the actuating shaft 21 and which is used to measure the fuel for the high-pressure circuit of the fuel injection pump in a known manner.
  • a flow channel 24 is guided through the signal box 12, through which fuel can flow out of the pump interior 11 into a fuel return line, which is no longer shown.
  • the flow channel 24, starting from the pump interior 11, is provided with an inlet filter 26 and in the following section is designed as a jet pump 27.
  • the trap pump 27 has an inlet connection 28, which is adjacent to the inlet filter 26 and to which a throttle 29 designed as a driving nozzle connects in the flow direction.
  • the throttle 29 is inserted with an outflow-side end section 30 into a mixing chamber 31, the end section 30, with the part of the mixing chamber 31 coaxially surrounding it, forming an intermediate annular gap, which represents a collecting nozzle 32.
  • a suction bore 33 which takes over the function of a suction nozzle, opens into the catching nozzle 32, preferably in a right-angled position.
  • the suction bore 33 is connected via an interlocking end section 34 to a blind bore 36 forming the lowest point of the interlocking space 13 and arranged in the wall of the basic housing 16.
  • a suction filter 37 is pressed into the blind bore 36, the inlet side 38 of which is connected to the interlocking space 13 and the outlet side 39 of which is connected to the end portion 34 of the suction bore 33 on the interlocking side.
  • the flow channel 24 continues in the flow direction up to the confluence with an overflow opening 41 formed in the cover 17.
  • the energy transfer from the propulsion jet to the trailing jet takes place in the mixing chamber 31 by pulse exchange, as a result of which a fuel flow, starting from the pump interior 11 via the throttle point 22, the bottom of the basic housing 16, the blind bore 36, the suction filter 37, the jet pump 27 to the overflow opening 41, those with a depressurized space in Connection is established.
  • a filling of the signal box 13 with fuel is limited to a level which is determined by the position of the inlet side 38 of the suction filter 37.
  • the position of the inlet side 38 is selected such that the parts of the interlocking 14 carrying an electrical potential, which form a material measure for the control of the fuel metering, lie above the inlet side 38 and thus before the direct influence of fuel, which could cause a change in the material measures, are protected.
  • the throttle point 22 towards the signal box 14 is closed off with an annular groove 42 on the signal box side, forming a hydraulic lock, since the annular groove 42 is connected to a relief line 43 leading to the jet pump 27 and thus to a point with lower pressure levels.
  • a check valve 44 Arranged in the relief line 43 is a check valve 44 which opens in the flow directed from the annular groove 42 to the suction port 33 and which prevents a fuel flow from the jet pump 27 to the annular groove 42 which does not occur during operation but does not occur when the fuel tank is in a suitable position.
  • the parts of the interlocking 14 carrying an electrical potential in particular the potentiometer 9, which form a measuring standard determining the fuel quantity to be injected by the fuel injection pump, against aging processes which are caused by the fuel contact in conjunction with the therein contained complex built-up additives whose effects are difficult to assess.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
EP19900113629 1989-08-30 1990-07-17 Pompe à injection de combustible pour moteur à combustion interne Ceased EP0419783A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3928718 1989-08-30
DE3928718A DE3928718A1 (de) 1989-08-30 1989-08-30 Kraftstoffeinspritzpumpe fuer brennkraftmaschinen

Publications (1)

Publication Number Publication Date
EP0419783A1 true EP0419783A1 (fr) 1991-04-03

Family

ID=6388208

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900113629 Ceased EP0419783A1 (fr) 1989-08-30 1990-07-17 Pompe à injection de combustible pour moteur à combustion interne

Country Status (4)

Country Link
US (1) US5044890A (fr)
EP (1) EP0419783A1 (fr)
JP (1) JPH0396630A (fr)
DE (1) DE3928718A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3937922A1 (de) * 1989-11-15 1991-05-16 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
US8388322B2 (en) * 2007-10-30 2013-03-05 Fluid Control Products, Inc. Electronic fuel pump
US7774125B2 (en) * 2008-08-06 2010-08-10 Fluid Control Products, Inc. Programmable fuel pump control
US7810470B2 (en) * 2008-08-06 2010-10-12 Fluid Control Products, Inc. Return-flow electronic fuel pressure regulator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE837336C (de) * 1950-07-23 1952-04-21 Kloeckner Humboldt Deutz Ag Kraftstoffeinspritzvorrichtung
GB1145804A (en) * 1966-07-16 1969-03-19 Daimler Benz Ag Improvements relating to fuel-delivery arrangements for internal combustion engines operating with fuel injection
US3630643A (en) * 1969-02-28 1971-12-28 Bosch Gmbh Robert Fuel injection pump
DE3704578A1 (de) * 1987-02-13 1988-08-25 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3739198C1 (de) * 1987-11-19 1989-05-03 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer Brennkraftmaschinen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1483005A (en) * 1974-09-09 1977-08-17 Borg Warner Charge forming apparatus having a heat exchanger system
JPS5614824A (en) * 1979-07-18 1981-02-13 Hitachi Ltd Overheat preventing apparatus for fuel supply system controlling unit
US4532893A (en) * 1982-09-30 1985-08-06 Cummins Engine Company, Inc. Electronically controlled fuel pump
JPS6288876U (fr) * 1985-11-22 1987-06-06
DE3719809C1 (de) * 1987-06-13 1988-06-09 Daimler Benz Ag Stautopf fuer Kraftstoffbehaelter
US4926829A (en) * 1988-11-28 1990-05-22 Walbro Corporation Pressure-responsive fuel delivery system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE837336C (de) * 1950-07-23 1952-04-21 Kloeckner Humboldt Deutz Ag Kraftstoffeinspritzvorrichtung
GB1145804A (en) * 1966-07-16 1969-03-19 Daimler Benz Ag Improvements relating to fuel-delivery arrangements for internal combustion engines operating with fuel injection
US3630643A (en) * 1969-02-28 1971-12-28 Bosch Gmbh Robert Fuel injection pump
DE3704578A1 (de) * 1987-02-13 1988-08-25 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3739198C1 (de) * 1987-11-19 1989-05-03 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer Brennkraftmaschinen

Also Published As

Publication number Publication date
DE3928718A1 (de) 1991-03-07
JPH0396630A (ja) 1991-04-22
US5044890A (en) 1991-09-03

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