EP0354399B1 - Pompe à injection de carburant pour moteurs à combustion interne - Google Patents

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

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Publication number
EP0354399B1
EP0354399B1 EP89113524A EP89113524A EP0354399B1 EP 0354399 B1 EP0354399 B1 EP 0354399B1 EP 89113524 A EP89113524 A EP 89113524A EP 89113524 A EP89113524 A EP 89113524A EP 0354399 B1 EP0354399 B1 EP 0354399B1
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel
fuel injection
valve
injection pump
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
EP89113524A
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German (de)
English (en)
Other versions
EP0354399A1 (fr
Inventor
Peter Knorreck
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0354399A1 publication Critical patent/EP0354399A1/fr
Application granted granted Critical
Publication of EP0354399B1 publication Critical patent/EP0354399B1/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
    • 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
    • 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
    • F02M59/447—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 means specially adapted to limit fuel delivery or to supply excess of fuel temporarily, e.g. for starting of the engine
    • 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

Definitions

  • the invention relates to a fuel injection pump according to the preamble of the main claim.
  • a fuel injection pump known from DE-A-3 148 214
  • the controlled fuel pressure of the interior controls both a start of injection adjustment with an early start of injection on cold start and a fuel injection quantity adjustment device.
  • a pressure chamber is continuously connected to a reset chamber via a throttle and this is connected to a relief chamber via a relief line.
  • the pressure relief valve is arranged in the relief line, which maintains a high pressure unaffected by the control device when the internal combustion engine is still cold and is stopped by the control device when the internal combustion engine is at operating temperature.
  • the fuel injection pump according to the invention with the characterizing feature of the main claim has the advantage that the increased pressure initially required for the start of injection in a cold internal combustion engine does not act in the interior and does not act on the adjusting device, but that a speed-dependent pressure is nevertheless controlled in the interior with the pressure control valve, through which the adjustment device can be controlled and errors in the maximum fuel quantity metering can be avoided.
  • Figure 1 shows a schematic representation of the fuel injection pump
  • Figure 2 shows speed / pressure curves in the fuel injection pump according to the invention
  • 3 shows an alternative detailed embodiment of the fuel injection pump according to FIG. 1.
  • an adjusting piston 2 engages via a pin 1 to adjust the start of injection.
  • the adjusting piston 2 is displaceable in an injection adjusting cylinder 55 against the force of a return spring 4 and delimits a working space 3 there as a movable wall.
  • Pressure fluid in the form of fuel in the working space 3 moves the valve piston with increasing fuel pressure against the force of the return spring 4, in such a way that that, the further the adjusting piston 2 is moved in the direction of the return spring 4, the injection timing is shifted to "early".
  • the working space 3 is supplied with fuel by a speed-dependent, speed-proportionally driven feed pump 5 which draws fuel from a fuel tank 6 and delivers it into a feed pump pressure line 7.
  • a pressure line 8 branches off from the feed pump pressure line 7 and contains an element in the form of a check valve 10 which does not influence the flow and opens into the working space 3.
  • the latter is connected to an interior 15 of the fuel injection pump via a bore 11, which is arranged in the adjusting piston and contains a throttle 12a, and a subsequent connection 14a.
  • a leakage line 57 provided with a throttle 37 leads away from the interior 15.
  • the fuel supply to the interior 15 takes place from the feed pump pressure line 7 via a pressure line 9, which contains a pressure holding valve 27.
  • This has a cylinder 29, into which a pressure chamber 32 connected to the pressure line is delimited by a piston 31, which serves as a valve closing member and is axially displaceable in the cylinder and is acted upon by a preferably adjustable return spring 34 arranged in a spring chamber 39.
  • the piston controls one of the cylinder wall of the cylinder 29 of the pressure control valve outgoing control opening 35 which represents a passage cross section of the pressure line 9 and which is connected to the interior 15 via a second part 36 of the pressure line 9.
  • a control device 33 controlled by the temperature of the internal combustion engine which has an actuating element 41 designed as a bolt, which projects axially into the pressure chamber 32 and through which, in its one end position, corresponds to an operating temperature
  • the piston 31 is shifted so far that it has opened the discharge opening 35.
  • the piston 31 can be moved so far by the return spring 34 that the control opening 35 can be closed by the piston.
  • a leak line 38 leads from the spring chamber 39 to the fuel reservoir 6 or to the suction side of the feed pump.
  • the throttle 12a, the bore 11 and the connection 14a are replaced by a connecting line 14 containing a throttle 12 between the pressure line 8 upstream of the check valve 10 and the interior 15, so that a bypass to the pressure holding valve 27 is formed.
  • This bypass can also be integrated in the pressure holding valve as a throttle bore through the piston 31 or as a throttle groove in the wall of the cylinder 29.
  • the pressure control valve 17 has a piston 18, which serves as a movable wall and can be displaced in a cylinder 70 against the force of a control spring 19, which in the cylinder 70 separates a pressure chamber 20, which is connected to the interior 15 via a line 16, from a reset chamber 28, in which the control spring 19 is arranged and the one discharge cross-section 21 more or less opens a discharge line 22 connected to the suction side of the feed pump from the pressure chamber 20.
  • the pressure in the interior 15 is controlled as a function of the speed, essentially as a function of the speed.
  • a connecting line 23 also leads from the interior 15 into an equalizing pressure chamber 24 of an equalizing device 64, which has an equalizing piston 26 that is axially displaceable in an equalizing cylinder 67 against the force of a restoring spring 69 and separates the equalizing pressure chamber 24 from a restoring chamber 25.
  • the position of the adjustment piston 26 is dependent on the pressure in the interior 15 controlled by the pressure control valve 17 and controls a fuel injection quantity element 68 via a sensing pin 66.
  • the actuating element 41 is in its other end position, in which the control opening 35 on the pressure-maintaining valve 27 is closed by the piston 31.
  • the feed pump 5 therefore conveys initially only via the feed pump pressure line 7, the pressure line 8 and the check valve 10 into the working space 3, so that there a high pressure is quickly reached with the full output of the feed pump, which in the first embodiment is only slightly affected by the over the throttle 12a flowing into the interior 15 is influenced.
  • the interior 15 is supplied with fuel via the pressure holding valve 27 as soon as its opening pressure is reached and / or through the throttle 12 or 12a, which is supplied by the pressure control valve 17 is maintained at a speed-dependent pressure, regardless of leakage losses via the throttle 37 and the fuel withdrawal for fuel injection.
  • the adjustment device is already controlled when the internal combustion engine or the fuel injection pump starts up for the first time.
  • the start of spraying is influenced right from the start and set to "early" as requested above. If the fuel supply to the interior through the pressure control valve is sufficient in this operating phase, the throttle 12 or 12a can also be omitted.
  • FIG. 2 shows a coordinate cross in which the rotational speed is plotted on the abscissa and the pressure prevailing in the work space 3 is plotted on the ordinate.
  • a characteristic curve 40 shows a steep increase in pressure at low speed between points 41 and 42. In the area of point 42, however, the opening pressure of the pressure holding valve 27 is reached and the control opening 35 is opened. As a result, the pressure in the working space 3 is increased only insignificantly with increasing speed.
  • a characteristic curve 44 is shown, which shows the pressure curve in the interior 15, controlled by the pressure control valve 17.
  • This pressure curve which is shown in FIG. 2, occurs as follows: The pressure of the feed pump 5, which is driven in proportion to the speed and which is applied to the piston 31 of the pressure holding valve 27, displaces the piston 31 against the force of the return spring 34 and opens the control opening 35 just enough to maintain the holding pressure or the opening pressure of the pressure holding valve on the feed pump side. This only results in a throttled inflow into the interior 15, in which a pressure-dependent pressure 15 can now be set by means of the pressure control valve 17, by means of which the adjustment device 64 is actuated as a function of the speed.
  • the fuel injection quantity control is not influenced by the cold start early setting of the start of injection and a quick-acting cold start early adjustment is achieved.
  • the throttle 12 fulfills the purpose that the interior 15 is supplied with sufficient fuel when the internal combustion engine is cold with certain designs of the pressure control valve 27 and the fuel delivery pump when the pressure control valve 27 is opened late, so that together with the check valve 10, the adjusting piston 2 the pump pistons are not displaced significantly in the event of a sudden load due to the delivery strokes, and the injection timing can thus be observed precisely enough.
  • the higher pressure causing the early adjustment in the work space 3 is reduced when the temperature-affected control device 33 is actuated when the operating temperature of the internal combustion engine is reached and the actuating element 41, which is connected to an expansion element or a bimetallic spring, the piston 31 against the force the return spring 34 moves and thus opens the control opening 35.
  • the interior 15 is connected to the feed pump 5 and the pressure formed by the pressure control valve 17 in the interior 15 is also effective in the working space 3 for controlling the start of injection.
  • the same device 33 can also be designed with a temperature-dependent controlled electromagnet.
  • a timer can also be set which controls the actuating element 41 or controls a valve which opens an unthrottled bypass completely in order to cancel the pressure maintenance function of the pressure maintenance valve.
  • the device 33 by means of the actuating element 41 holds the piston 31 in a position in which the control opening 35 is opened via the control line 36 to the interior 15 and to adjust the start of injection the pressure in the interior 15 and in the work space 3 exclusively is changed depending on the speed by the force of the control spring 19 and the piston 18.
  • FIG. 3 An alternative embodiment is shown in FIG. 3. With an otherwise identical structure, changes are made to the adjusting piston 2a and to the pressure line 8a. Instead of the check valve, a throttle 50 is arranged in the pressure line 8a and the bore 11 with throttle 12 from FIG. 1 is omitted from the control piston 2a.
  • the throttle 50 here takes on the function of the throttle 12 from the above exemplary embodiment. It serves to supply fuel to the working space 3 and prevents the adjusting piston 2a from being displaced by mechanical forces on the adjusting piston 2a.

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)

Claims (5)

  1. Pompe à injection de carburant pour moteur à combustion interne, comprenant :
    - un piston (2) servant au réglage du début de l'injection et soumis à l'action d'un ressort de rappel, le piston (2) délimitant une chambre de travail (3) reliée par une conduite sous pression (8) au refoulement d'une pompe (5) tournant à une vitesse fonction de celle du moteur et alimentant en carburant une chambre interne (15) dans laquelle la pression du carburant est pilotée, en fonction de la vitesse du moteur, par une soupape de pilotage de pression (17) présentant une chambre de pression (20) et une chambre (28) contenant un ressort de rappel, séparées par une paroi mobile (18) commandant une section de pilotage (21),
    - une soupape de maintien de pression (27) exerçant une influence complémentaire sur la pression du carburant et comportant un obturateur coulissant (31), soumis à la pression du carburant contre l'action d'un ressort de rappel (34) et commandant une section de passage (35), le fonctionnement de la soupape (27) étant commandé par un dispositif de pilotage (33) en fonction d'au moins un paramètre de fonctionnement, de sorte qu'en partant du moteur démarrant à froid, la soupape (27) cesse d'exercer son action lorsqu'au moins un paramètre détecté atteint une valeur représentant la température de fonctionnement,
    - un dispositif d'équilibrage (64), piloté par la pression du carburant dans la chambre interne et servant à régler le débit d'injection en fonction de la vitesse du moteur,
    caractérisé en ce que la conduite sous pression (8) contient un élément (10, 50) agissant sur son débit et la reliant directement au refoulement de la pompe (5) qui peut lui-même être complémentairement relié à la chambre interne (15) par la soupape de maintien de pression (27).
  2. Pompe à injection selon la revendication 1, caractérisée en ce qu'un étranglement (12, 12a) est monté en parallèle à la section de passage (35) pilotée.
  3. Pompe à injection selon la revendication 2, caractérisée en ce que l'élément agissant sur le débit est constitué par une soupape anti-retour (10) ouvrant en direction de la chambre de travail, un étranglement (12a) étant prévu dans le piston de réglage, entre la chambre de travail (3) et la chambre interne (15).
  4. Pompe à injection selon la revendication 1, caractérisée en ce que l'élément agissant sur le débit est un étranglement (50).
  5. Pompe à injection selon l'une des revendications précédentes, caractérisée en ce que le dispositif de pilotage (33) comporte un actionneur (41) permettant d'amener l'obturateur coulissant (31) en position d'ouverture.
EP89113524A 1988-08-11 1989-07-22 Pompe à injection de carburant pour moteurs à combustion interne Expired - Lifetime EP0354399B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3827206 1988-08-11
DE3827206A DE3827206A1 (de) 1988-08-11 1988-08-11 Kraftstoffeinspritzpumpe fuer brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0354399A1 EP0354399A1 (fr) 1990-02-14
EP0354399B1 true EP0354399B1 (fr) 1993-10-27

Family

ID=6360613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89113524A Expired - Lifetime EP0354399B1 (fr) 1988-08-11 1989-07-22 Pompe à injection de carburant pour moteurs à combustion interne

Country Status (5)

Country Link
US (1) US4932385A (fr)
EP (1) EP0354399B1 (fr)
JP (1) JPH0278738A (fr)
KR (1) KR900003521A (fr)
DE (2) DE3827206A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3822257A1 (de) * 1988-07-01 1990-01-04 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
US5263457A (en) * 1989-12-06 1993-11-23 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
JPH07505692A (ja) * 1992-04-09 1995-06-22 ルーカス・インダストリーズ・パブリック・リミテッド・カンパニー 燃料ポンピング装置
US5276478A (en) * 1992-05-19 1994-01-04 Eastman Kodak Company Method and apparatus for optimizing depth images by adjusting print spacing
DE4311672A1 (de) * 1993-04-08 1994-10-13 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
DE4446277B4 (de) * 1994-12-23 2007-04-19 Robert Bosch Gmbh Kraftstoffversorgungssystem für eine Brennkraftmaschine
DE19812698A1 (de) * 1998-03-23 1999-09-30 Volkswagen Ag Einrichtung zum Regeln des Spritzbeginns in einer Verteiler-Kraftstoffeinspritzpumpe für Verbrennungsmotoren

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3633559A (en) * 1970-06-19 1972-01-11 Bosch Gmbh Robert Apparatus for regulating the timing of fuel injection in internal combustion engines
DE2648043C2 (de) * 1976-10-23 1984-05-24 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe für Brennkraftmaschinen
DE2925418A1 (de) * 1979-06-23 1981-01-29 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3121635A1 (de) * 1981-05-30 1982-12-23 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3138607A1 (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
DE3216681A1 (de) * 1982-05-04 1983-11-10 Diesel Kiki Co. Ltd., Tokyo Kraftstoffeinspritzvorrichtung vom verteilertyp
US4539956A (en) * 1982-12-09 1985-09-10 General Motors Corporation Diesel fuel injection pump with adaptive torque balance control
DE3341300A1 (de) * 1983-11-15 1985-05-23 Robert Bosch Gmbh, 7000 Stuttgart Drucksteuerventil fuer kraftstoffeinspritzpumpen
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
DE3423212A1 (de) * 1984-06-22 1986-01-02 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe
DE3517974A1 (de) * 1985-05-18 1986-11-20 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen

Also Published As

Publication number Publication date
DE58906006D1 (de) 1993-12-02
DE3827206A1 (de) 1990-02-15
KR900003521A (ko) 1990-03-26
US4932385A (en) 1990-06-12
EP0354399A1 (fr) 1990-02-14
JPH0278738A (ja) 1990-03-19

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