EP0515813A1 - Pompe à injection de combustible pour moteurs à combustion interne - Google Patents

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

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Publication number
EP0515813A1
EP0515813A1 EP92106301A EP92106301A EP0515813A1 EP 0515813 A1 EP0515813 A1 EP 0515813A1 EP 92106301 A EP92106301 A EP 92106301A EP 92106301 A EP92106301 A EP 92106301A EP 0515813 A1 EP0515813 A1 EP 0515813A1
Authority
EP
European Patent Office
Prior art keywords
pressure
control
fuel injection
injection 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.)
Granted
Application number
EP92106301A
Other languages
German (de)
English (en)
Other versions
EP0515813B1 (fr
Inventor
Karl Konrath
Hannes Dipl.-Min. Pflug
Paul Wuetherich
Helmut Simon
Mohammad-Ali Dr.-Ing. Khosrawi
Berni Dipl.-Ing. Reisser
Christian Dipl.-Ing. Taudt
Wolfgang Goll
Michael Dipl.-Ing. Scharf
Thomas Dipl.-Wirt.-Ing. Fortenbacher (Fh)
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 EP0515813A1 publication Critical patent/EP0515813A1/fr
Application granted granted Critical
Publication of EP0515813B1 publication Critical patent/EP0515813B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02M41/128—Varying injection timing by angular adjustment of the face-cam or the rollers support
    • 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
    • F02D1/16—Adjustment of injection timing
    • F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
    • F02D1/183—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic
    • 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
    • F02D1/16—Adjustment of injection timing
    • F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
    • F02D1/183—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic
    • F02D2001/186—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic using a pressure-actuated piston for adjustment of a stationary cam or roller support
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0606—Fuel temperature

Definitions

  • the invention is based on a fuel injection pump according to the preamble of the main claim.
  • a fuel injection pump according to the preamble of the main claim.
  • Such is known from German patent application DE-OS 39 12 624.
  • a hydraulic blocking of the pressure control valve of the feed pump prevents it from being deactivated and thus the entire fuel delivered is used to build up the control pressure. In this way, even with a cold internal combustion engine, a high suction chamber pressure and the associated spray adjustment in the direction of early can be achieved as quickly as possible.
  • the known cold start system consists of a fuel injection pump with a spray adjustment device, a feed pump via which a pressure control valve located in the feed line to the fuel injection pump controls the inflow to the suction space and two valves arranged in parallel in the relief line of the pressure control valve return space, one of which is dependent on the operating temperature of the engine and the other is opened depending on the control pressure in the suction chamber.
  • These two valves in the relief line of the pressure control reset space enable a shutdown of the fuel flow in the warm-up phase or when starting the engine by hydraulically blocking the bypass line via the pressure control valve, so that all of the fuel Fuel injection pump flows in and can quickly build up the control pressure in a known manner, which results in an adjustment of the spray adjustment device in the early direction.
  • the fuel injection pump according to the invention with the characterizing features of claim 1 has the advantage that the position of the actuating piston of the spray adjustment device is used as a speed-proportional signal to control the blocking of the relief line of the pressure control valve. This eliminates the need for a separate pressure-controlled valve, which represents a significant cost advantage in the manufacture of the fuel injection pump. In addition, the tolerances of the spray adjustment can be kept small during the transition from cold start acceleration to normal function. Further advantages and advantageous embodiments of the invention can be found in the following description, the drawing and the claims.
  • FIG. 1 shows a schematic illustration of the fuel injection pump according to the invention
  • FIG. 2 shows the pressure profile in the pressure chamber of the pressure control valve or of the control pressure effective at the spray adjustment device in various functional positions of the actuating piston.
  • FIG. 1 shows a part of a distributor fuel injection pump 1 with a spray adjustment device 2, which has an adjustment piston 4 which can be displaced in a cylinder 3 and which is acted upon on one end face by a return spring 5 which is supported in a stationary manner on an end face of the cylinder 3 and is supported is located in a reset space 9, which is formed by an end face and the wall of the cylinder 3, and an end face of the injection adjusting piston 4, on the other end side of which a spray adjuster working space 6 in the cylinder 3 is limited.
  • the injection adjuster working space 6 is connected via a throttle bore 7 in the injection adjustment piston 4 to a suction space 8 in the interior of the fuel injection pump.
  • the cylinder 3 has an inlet bore 10 on its cylindrical wall, which is opened or closed via a control edge 11 formed by a bore in the injection adjustment piston 4 that is permanently connected to the reset space during the axial movement of the injection adjustment piston 4 in the cylinder 3.
  • a relief bore 12 opens into the resetting space 9 of the spray adjustment device 2 via the end face of the cylinder 3, so that this is constantly relieved of pressure via a return line 13 to the fuel tank 14.
  • the Suction chamber 8 is supplied with fuel by a feed pump 15, which is driven synchronously with the distributor fuel injection pump 1, via a pressure line 16, the feed pump 15 taking the fuel from the fuel tank 14 via a suction line 17.
  • a bypass line 18 is arranged parallel to the feed pump 15 and contains a pressure control valve 19.
  • This has an adjustable wall in the form of a control piston 20, which slides tightly in a cylinder 21 and delimits a pressure space 22 on one end face, into which the bypass line 18 opens from the pressure line 16.
  • the control piston 20 delimits a resetting space 25, in which a resetting spring 26 is arranged, which is supported on the control piston 20 on the one hand and on the upper end face of the cylinder 21 on the other hand.
  • a drain line 23 of the pressure chamber 22 is introduced into the cylindrical wall of the cylinder 21, the cross section of which is opened or closed by a control edge 24 formed by the bottom of the control piston 20, depending on the axial position of the control piston 20.
  • This drain line 23 opens via the bypass line 18 back into the suction line 17 to the feed pump 15.
  • the reset chamber 25 is constantly connected to the pressure chamber 22 via a throttle 27. Furthermore, the reset space 25 is connected to the fuel tank 14 via a relief line 29. In this relief line 29, a pressure holding valve 30 is arranged, which can block the outflow from the resetting space 25.
  • This pressure holding valve 30 is designed as a check valve and is closed by a ball valve 31 with spring element 32, the closing member being able to be opened by a temperature-dependent actuating element 33.
  • This actuator 33 is, for example, a thermostat or an expansion element which is exposed to the cooling water of the internal combustion engine and thus detects the operating temperature of the internal combustion engine.
  • a relief line 39 leads to the inlet bore 10 in the cylinder 3 of the injection adjustment device 2, an opening cross section being released by the injection adjustment piston 4 from a certain axial position and the fuel from the reset space 25 of the pressure control valve 19 via the reset space 9 of the injection adjustment device 2 can flow to the fuel tank 14.
  • the fuel injection pump When the fuel injection pump is operating, its suction space is filled with fuel.
  • the resetting spring 26 adjusts the control piston 20 to the bottom of the cylinder 21 of the pressure control valve 19 and thus closes off the drain line 23.
  • the adjusting piston 4 is accordingly also in its initial position by the resetting spring 5 held and closes the circumference of the inlet bore 10.
  • the feed pump 15 is set in motion and generates a pressure in the suction chamber 8 or in the pressure chamber 22 of the pressure control valve 19. Since the relief of the reset chamber 25 when the internal combustion engine is still cold in the pressure control valve 19 via the Pressure-maintaining valve 30 and is blocked via the spray adjustment device 2, the control piston 20 is held in its initial position and the bypass line 18 remains closed.
  • the fuel from the resetting space 25 can flow out through the resetting space 9 of the spray adjustment device 2, which results in an immediate pressure drop in the resetting space 25 of the pressure control valve 19.
  • the pressure generated by the feed pump 15 in the pressure chamber 22 is now sufficient to move the control piston 20 against the spring force of the return spring 26 and thus to release the drain line 23 via the control edge 24 on the control piston 20. Since a part of the delivered fuel now flows through the bypass line 18 of the pressure control valve 19, the steep pressure rise in the suction chamber 8 is regulated and the associated advance adjustment of the spray adjustment device 2.
  • the temperature-dependent actuator 33 keeps the pressure-maintaining valve 30 open even when the engine is switched off and the fuel pressure drop associated therewith and when the coolant is hot, thus ensuring the constant relief of the reset space 25 in the pressure control valve 19. If the engine is now started, the pressure control and thus also the spray adjustment takes place immediately, depending on the speed, via the pressure control valve 19.
  • the device according to the invention thus enables extreme spray adjustment, to a degree limited by the adjustment piston of the spray adjuster, only when the internal combustion engine is cold. This has the advantage of a strong early adjustment in the case of a cold internal combustion engine, it does not adversely affect starting when the internal combustion engine is at operating temperature.
  • the advantage to be emphasized of the fuel injection pump according to the invention consists in the saving of a pressure valve in the relief line 29 of the pressure control valve 19, in that the speed-dependent control is implemented during the warm-up phase of the engine via the adjusting piston 4 of the spray adjustment device 2 of the distributor fuel injection pump 1.
  • FIG. 2 shows the course of the spray adjustment in a diagram over the speed.
  • the dashed lines show the fuel injection pump according to the invention in relation to the full line of a distributor fuel injection pump without a cold start accelerator. After starting the engine, the rapid build-up of pressure in the suction chamber and the associated steep increase in the start of spraying can be seen (point A - point B).
EP92106301A 1991-05-31 1992-04-11 Pompe à injection de combustible pour moteurs à combustion interne Expired - Lifetime EP0515813B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4117813 1991-05-31
DE4117813A DE4117813A1 (de) 1991-05-31 1991-05-31 Kraftstoffeinspritzpumpe fuer brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0515813A1 true EP0515813A1 (fr) 1992-12-02
EP0515813B1 EP0515813B1 (fr) 1995-03-08

Family

ID=6432847

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92106301A Expired - Lifetime EP0515813B1 (fr) 1991-05-31 1992-04-11 Pompe à injection de combustible pour moteurs à combustion interne

Country Status (4)

Country Link
US (1) US5188083A (fr)
EP (1) EP0515813B1 (fr)
JP (1) JPH05156970A (fr)
DE (2) DE4117813A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5263457A (en) * 1989-12-06 1993-11-23 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
DE3943246A1 (de) * 1989-12-29 1991-07-04 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
DE4311672A1 (de) * 1993-04-08 1994-10-13 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
GB9725415D0 (en) * 1997-12-02 1998-01-28 Lucas Ind Plc Advance arrangement
GB9826348D0 (en) * 1998-12-02 1999-01-27 Lucas Ind Plc Advance arrangement
DE19832842C1 (de) * 1998-07-21 2000-02-17 Bosch Gmbh Robert Kraftstoff-Fördersystem zur Kraftstoffversorgung einer Brennkraftmaschine
DE19942548A1 (de) * 1999-09-07 2001-03-08 Mannesmann Vdo Ag Zum Fördern von Kraftstoff aus einem Kraftstoffbehälter zu einer Brennkraftmaschine eines Kraftfahrzeuges vorgesehene Fördereinrichtung
GB0122968D0 (en) * 2001-09-24 2001-11-14 Delphi Tech Inc Advance arrangement
CN102906393B (zh) 2010-03-30 2015-04-22 斯蒂芬·李·坎宁安 振荡活塞发动机
US9869272B1 (en) 2011-04-20 2018-01-16 Martin A. Stuart Performance of a transcritical or supercritical CO2 Rankin cycle engine
CA2870310C (fr) 2012-04-18 2021-03-30 Martin A. Stuart Moteur a piston oscillant polygonal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589394A (en) * 1984-05-28 1986-05-20 Diesel Kiki Co., Ltd. Injection timing control device in a distributor-type fuel injection pump
EP0250785A1 (fr) * 1986-06-09 1988-01-07 Robert Bosch Gmbh Pompe d'injection de combustible pour moteurs à combustion interne
DE3912624A1 (de) * 1989-04-18 1990-10-25 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147746A (en) * 1961-04-01 1964-09-08 Bosch Gmbh Robert Injection pump adjusting structure
US3101078A (en) * 1961-04-25 1963-08-20 Cav Ltd Liquid fuel pumps
DE2918867A1 (de) * 1979-05-10 1980-11-20 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3112487A1 (de) * 1980-03-31 1982-03-18 Nissan Motor Co., Ltd., Yokohama, Kanagawa Kraftstoff-einspritzverteilerpumpe
DE3121635A1 (de) * 1981-05-30 1982-12-23 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3138606A1 (de) * 1981-09-29 1983-04-14 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3148214A1 (de) * 1981-12-05 1983-06-09 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3410146A1 (de) * 1984-03-20 1985-10-03 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3418437A1 (de) * 1984-05-18 1985-11-21 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3517974A1 (de) * 1985-05-18 1986-11-20 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589394A (en) * 1984-05-28 1986-05-20 Diesel Kiki Co., Ltd. Injection timing control device in a distributor-type fuel injection pump
EP0250785A1 (fr) * 1986-06-09 1988-01-07 Robert Bosch Gmbh Pompe d'injection de combustible pour moteurs à combustion interne
DE3912624A1 (de) * 1989-04-18 1990-10-25 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen

Also Published As

Publication number Publication date
DE4117813A1 (de) 1992-12-03
DE59201577D1 (de) 1995-04-13
EP0515813B1 (fr) 1995-03-08
JPH05156970A (ja) 1993-06-22
US5188083A (en) 1993-02-23

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