EP0456772B1 - Pompe d'injection de carburant pour moteurs a combustion interne - Google Patents

Pompe d'injection de carburant pour moteurs a combustion interne Download PDF

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Publication number
EP0456772B1
EP0456772B1 EP90915093A EP90915093A EP0456772B1 EP 0456772 B1 EP0456772 B1 EP 0456772B1 EP 90915093 A EP90915093 A EP 90915093A EP 90915093 A EP90915093 A EP 90915093A EP 0456772 B1 EP0456772 B1 EP 0456772B1
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EP
European Patent Office
Prior art keywords
pressure
space
control
fuel injection
adjusting piston
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
EP90915093A
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German (de)
English (en)
Other versions
EP0456772A1 (fr
Inventor
Karl Konrath
Claus Koester
Christian Taudt
André Brunel
Pierre Lauvin
François Quarret
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
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0456772A1 publication Critical patent/EP0456772A1/fr
Application granted granted Critical
Publication of EP0456772B1 publication Critical patent/EP0456772B1/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
    • 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

Definitions

  • the invention relates to a fuel injection pump according to the preamble of claim 1.
  • Such a fuel injection pump is known from EP-A 0 305 716.
  • This fuel injection pump has a speed-dependent delivery pump through which fuel is supplied to a suction chamber of the fuel injection pump. Furthermore, an adjusting piston serving to adjust the injection timing and acted upon by a restoring force is provided, which delimits a working space.
  • a control slide is arranged in the adjusting piston, which limits a pressure chamber there and can be displaced against a restoring force by a control pressure prevailing in the pressure chamber.
  • the pressure chamber is connected to the suction chamber via a connection containing a throttle and thus indirectly to the pressure side of the feed pump.
  • the working space of the adjusting piston is connected to the suction chamber of the internal combustion engine, and thus indirectly to the pressure side of the feed pump, or to a relief chamber or closed.
  • a throttle is arranged in the connection between the pressure chamber and the suction chamber. Downstream of the throttle, an outflow line leads away from the pressure chamber and contains an element influencing the flow in the form of a solenoid valve for controlling the control pressure as a function of operating parameters of the internal combustion engine. Because of the injection processes, pressure fluctuations occur in the suction chamber of the fuel injection pump, which have a negative effect on the control of the injection timing due to the connection of the pressure chamber and the working chamber of the adjusting piston to the suction chamber.
  • a fuel injection pump which has an adjusting piston for adjusting the injection timing, which counteracts a restoring force in a cylinder is slidably arranged and limited in this a work space.
  • a control slide is arranged displaceably against a return spring which is supported in the cylinder by means of an adjustable support.
  • the control slide delimits a pressure chamber in the blind bore, which is constantly connected to a suction chamber filled with fuel, which is controlled by the speed depending on the speed, for supplying the pump work chamber of the fuel injection pump.
  • the control slide Actuated by the pressure in the suction chamber, the control slide executes a speed-dependent actuating movement, the work chamber being connected to the pressure chamber or to a relief chamber, depending on the position of the control slide, or the control slide keeping the work chamber closed.
  • the control spool When the control spool is deflected from a position closing the work space after appropriate pressurization or relief of the work space, the adjusting piston executes a movement following the control spool which is ended by closing the work space again. Accordingly, an adjusting movement of the adjusting piston is carried out in the direction of an earlier or later injection time.
  • the support of the return spring of the control slide can be adjusted by an actuator.
  • the servomotor requires a large installation space.
  • the pressure fluctuations occurring there also have a negative effect on the control of the injection timing due to the connection of the pressure chamber and the working chamber with the suction chamber of the fuel injection pump.
  • the fuel injection pump according to the invention with the features of claim 1 has the advantage that the timing of the injection can be controlled with great accuracy, since the Pressure chamber bypassing the suction chamber is connected directly to the pressure side of the feed pump. In addition, no additional space-consuming and complex adjusting device is required.
  • FIG. 1 shows a schematic illustration of a fuel injection pump with a first exemplary embodiment
  • FIG. 2 with a second exemplary embodiment.
  • a fuel injection pump of a known type has an adjusting piston 11 engaging via a pin 10 in a cam drive of the fuel injection pump, not shown, for the adjustment of the injection timing.
  • the adjusting piston 11 is displaceable in an injection adjusting cylinder 12 against the force of a return spring 13 and limits there a working space 14 filled with fuel brought to a variable control pressure.
  • the return spring 13 is arranged in a relief chamber 15, on the other hand limited by the adjusting piston, which relieves pressure via a line 16 is.
  • a control slide 18 is displaceably arranged, which is acted upon by a second return spring 19 in the injection adjusting cylinder 12 lying parallel to the return spring 13 and delimits a pressure chamber 21 in the front end in the blind bore 17.
  • the control slide 18 has a supply channel 22 extending from its end face delimiting the pressure chamber 21, the opens in a first annular groove 23 serving as a control opening in the lateral surface of the control slide 18, and a relief channel 24, which starts from its end face facing the relief chamber 15 and opens into a second second groove 26 serving as a control opening.
  • the adjusting piston 11 has a channel 27 which extends from its end face which delimits the working space 14 and which opens into the blind bore 17.
  • a transverse bore 28 extends from the blind bore 17, which opens into a longitudinal groove 29 in the lateral surface of the adjusting piston 11.
  • the longitudinal groove 29 is connected to a groove 31 in the injection adjustment cylinder 12, into which a supply pressure line 42 opens, which is constantly connected to the transverse bore 28 via the longitudinal groove 29 and the groove 31, regardless of the longitudinal position of the adjusting piston 11, which is secured against rotation by the pin 10 .
  • the pressure chamber 21 is connected to the transverse bore 28 and thus to the supply pressure line 42 via the supply channel 22 and the first annular groove 23.
  • the working chamber 14 can either be connected to the supply pressure line 42 via the channel 27 and the first annular groove 23 or can be connected to the relief chamber 15 via the second annular groove 26 and the relief channel 24, or by means of between the first and the second annular groove lying outer surface of the control slide 18 can be closed.
  • the fuel injection pump has a feed pump 33 which is driven in proportion to its drive speed and which draws fuel from a fuel tank 34 and requests it into a feed pump pressure line 36.
  • a suction chamber 38 of the fuel injection pump is filled with fuel via the feed pump pressure line 36 and a pressure holding valve 37.
  • the pressure in the suction space 38, from which the pump working space of the fuel injection pump is supplied with fuel, is controlled by a pressure control valve 39, by the fuel can flow back to the suction side of the feed pump 33, controlled depending on the speed.
  • the pressure holding valve 37 in the feed pump pressure line 36 opens at a lower pressure than that which is controlled by the pressure control valve 39.
  • a non-return valve 41 opening to the interior 38 is arranged parallel to the pressure control valve 39.
  • a pressure line 42 in which a throttle 43 is arranged, branches off from the feed pump pressure line 36 upstream of the pressure-maintaining valve 37.
  • An outflow line 44 branches off downstream of the throttle 43 from the pressure line 42, which leads to the injection adjustment cylinder 12.
  • a solenoid valve 46 is arranged in the outflow line 44, through which the outflow line 44 to the suction side of the feed pump 33 can be relieved.
  • the solenoid valve 46 is controlled by a control unit 47 as a function of operating parameters of an internal combustion engine operated with the fuel injection pump that are relevant for the start of injection, such as, for example, load, temperature or acceleration.
  • the solenoid valve 46 controls the pressure prevailing in the supply pressure line 42 as a control pressure to a value that lies between the pressure generated by the feed pump 33 and the pressure prevailing on the suction side of the feed pump 33.
  • the position of the control spool 18 is determined by the control pressure, and at the same time it serves as an actuating medium for tracking the adjusting piston 11.
  • the control spool 18 With increasing control pressure, the control spool 18 is displaced out of the blind bore 17 and the working space 14 is acted upon by the control pressure via the first annular groove 23, so that the Adjusting piston 11 is moved against the force of the return spring 13, wherein it adjusts the injection timing in the "early" direction.
  • the adjusting piston 11 traverses the first annular groove 23, so that the working space 14 is no longer connected to the supply pressure line 42 and thus the adjusting movement of the adjusting piston 11 is stopped and the injection timing is no longer adjusted.
  • the control slide 18 When the control pressure drops, the control slide 18 is pushed into the blind bore 17 by its return spring 19 and the working space 14 is connected to the relief space 15 via the second annular groove 26 and the relief channel 24, so that fuel flows out of the working space 14.
  • the adjusting piston 11 is displaced by the return spring 13 in the direction of a later injection point in time until the adjusting piston 11 passes over the second annular groove 26 again after a certain distance and the working space 14 is separated from the relief space 15.
  • the supply pressure is independent of the pressure in the suction space 38, since it is decoupled from it by the throttle 43, so that pressure changes in the suction space 38 do not fundamentally affect the injection timing adjustment. If only a speed-dependent injection timing adjustment is desired, the solenoid valve 46 remains closed and the control pressure is determined by the suction chamber pressure. Due to the pressure holding valve 37 in the feed pump pressure line 36, an early relatively high pressure is available for a cold start of the internal combustion engine when the fuel injection pump starts, for an early adjustment of the injection time, since the pressure holding valve 37 only opens to the suction chamber 38 at a certain pressure.
  • the suction chamber 38 can be filled with fuel by the check valve 41.
  • a throttle 143 corresponding to the throttle 43 is arranged in the supply channel 122.
  • the throttle in the pressure line 42 is then omitted.
  • the pressure chamber 121 delimited by the control slide 118 is connected to the outflow line 144 via a bore 151 in the adjusting piston 111 and grooves 152 and 153 in the adjusting piston 111 or injection adjusting cylinder 112, in which the solenoid valve 146 is again arranged.
  • the working space can be filled quickly and thus enables a quick adjustment of the adjusting piston 111, since it is connected to the pressure side of the feed pump unthrottled when the control slide 118 is in the appropriate position.
  • the setting of the control pressure is limited to the very small volume of the pressure chamber 121, so that the delivery losses for the control pressure control can be kept very small. In contrast, the relatively higher, unmodified outlet pressure flows to the working space 114.

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

Abstract

Une pompe d'injection de carburant pour moteurs à combustion interne comprend un piston de réglage (11) du moment d'injection qui délimite un espace de travail (14) dans un cylindre (12). Un tiroir de distribution (18) mobile entraîné par une pression d'alimentation est agencé dans un alésage borgne (17) du piston de réglage (11) de façon à délimiter une chambre de pression (21) dans l'alésage borgne (17). Selon la position du tiroir de distribution (18), l'espace de travail (14) est relié à la chambre de pression (21) ou à une chambre de décharge (15). La pression d'alimentation est générée par une pompe de refoulement (33) et modifiée par une électrovanne (46) agencée dans un conduit d'écoulement (44) en fonction des paramètres de fonctionnement du moteur à combustion interne, de façon à assurer un réglage du moment d'injection en fonction des paramètres de fonctionnement.

Claims (5)

  1. Pompe d'injection de carburant pour des moteurs thermiques, comprenant une pompe d'alimentation (33) débitant de façon proportionnelle à la vitesse de rotation, qui fournit du carburant à une chambre d'aspiration (38) d'une pompe d'injection, avec un piston de réglage (11, 111) servant à régler le point d'injection, ce piston étant sollicité par une force de rappel et délimitant une chambre de travail (114), un distributeur de commande (18, 118) étant logé dans ce piston, ce distributeur délimitant dans le piston de réglage (11, 111) une chambre de pression (21, 121) au moins indirectement reliée au côté de pression de la pompe d'alimentation (33), ce distributeur coulissant sous l'effet de la pression de commande contre la force de rappel engendrée par la pression de commande régnant dans la chambre de pression (21, 121) et qui relie la chambre de travail (14) au moins indirectement au côté pression de la pompe d'alimentation (33) ou avec une chambre de décharge (15) ou encore ferme cette liaison et dont la liaison de la chambre de pression (21, 121) avec le côté pression de la pompe d'alimentation (33) il est prévu un organe d'étranglement (43, 143) qui permet de décharger la chambre de pression (21) par une conduite d'évacuation (44, 144) partant en aval de l'organe d'étranglement (43, 143), cette conduite d'évacuation étant équipée pour commander la pression de commande régnant dans la chambre de pression (21, 121) selon les paramètres de fonctionnement du moteur thermique, un élément (46, 146) influençant le débit, pompe caractérisée en ce que la chambre de pression (21, 121) peut être reliée exclusivement par une conduite de pression (42) comportant l'organe d'étranglement (43, 143), uniquement directement avec le côté de pression de la pompe d'alimentation (33) en contournant la chambre d'aspiration (38) de la pompe d'injection de carburant.
  2. Pompe d'injection de carburant selon la revendication 1, caractérisée en ce que l'élément influençant le débit est une électrovanne (46).
  3. Pompe d'injection de carburant selon la revendication 1 ou 2, caractérisée en ce que la conduite d'évacuation (144) prend naissance directement avant la chambre de pression (121) et le tiroir de commande (118) comporte un canal d'alimentation (122) qui est relié à l'un des orifices de commande (23, 26) disposés les uns derrière les autres dans la direction axiale sur le distributeur de commande (18), cette ouverture de commande étant reliée à une partie (28) de la conduite de pression (42) aboutissant au piston de réglage (11) et lors du déplacement du distributeur de commande (18) par rapport au piston de réglage (11) cette conduite peut être reliée à un canal (27) aboutissant à la chambre de travail (14).
  4. Pompe d'injection de carburant selon la revendication 2, caractérisée en ce que la conduite d'évacuation (44) dérive de la conduite de pression (42) et le distributeur de commande (18) comporte un canal d'alimentation (22) qui est relié à l'une des ouvertures de commande (23, 26) placées l'une derrière l'autre dans la direction axiale sur le distributeur de commande (18), cette conduite étant reliée à une partie (28) traversant le piston de réglage (11) de la conduite de pression (42) et en cas de déplacement du distributeur de commande (18) par rapport au piston de réglage (11) cette conduite est reliée à un canal (27) conduisant à la chambre de travail (14).
  5. Pompe d'injection de carburant selon l'une des revendications 2 à 4, caractérisée en ce que la pompe d'alimentation (33) transfère par l'intermédiaire d'une conduite d'alimentation (36) dans la chambre d'aspiration (38), une soupape de retenue de pression (37) étant prévue dans la conduite d'alimentation (36), cette soupape libérant le passage vers la chambre d'aspiration (38) seulement pour une certaine pression régnant dans la conduite d'alimentation (36) et déchargeant la chambre d'aspiration (38) par une soupape de commande de pression (39).
EP90915093A 1989-12-06 1990-10-25 Pompe d'injection de carburant pour moteurs a combustion interne Expired - Lifetime EP0456772B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3940340 1989-12-06
DE3940340 1989-12-06
DE4016462 1990-05-22
DE4016462A DE4016462A1 (de) 1989-12-06 1990-05-22 Kraftstoffeinspritzpumpe fuer brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0456772A1 EP0456772A1 (fr) 1991-11-21
EP0456772B1 true EP0456772B1 (fr) 1994-01-19

Family

ID=25887728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90915093A Expired - Lifetime EP0456772B1 (fr) 1989-12-06 1990-10-25 Pompe d'injection de carburant pour moteurs a combustion interne

Country Status (6)

Country Link
EP (1) EP0456772B1 (fr)
JP (1) JP3040464B2 (fr)
KR (1) KR0174251B1 (fr)
DE (2) DE4016462A1 (fr)
ES (1) ES2049048T3 (fr)
WO (1) WO1991008386A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9400719D0 (en) * 1994-01-15 1994-03-16 Lucas Ind Plc Fuel pumping apparatus
DE4440749A1 (de) * 1994-11-15 1996-05-23 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
DE19723865A1 (de) 1997-06-06 1998-12-10 Bosch Gmbh Robert Kraftstoffeinspritzpumpe mit einem temperaturgesteuerten Ventil im Spritzversteller

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6429632A (en) * 1987-07-22 1989-01-31 Nippon Denso Co Distribution type fuel injection pump

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2054206B (en) * 1979-07-06 1983-03-23 Lucas Industries Ltd Fuel injection pumping apparatus
DE3201914A1 (de) * 1982-01-22 1983-08-04 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3611044A1 (de) * 1986-04-02 1987-10-08 Bosch Gmbh Robert Verstelleinrichtung fuer den spritzbeginn bei einer kraftstoffeinspritzpumpe
DE3729636A1 (de) * 1987-09-04 1989-03-16 Bosch Gmbh Robert Verfahren zur steuerung der zeit der kraftstoffhochdruckfoerderung einer kraftstoffeinspritzpumpe

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6429632A (en) * 1987-07-22 1989-01-31 Nippon Denso Co Distribution type fuel injection pump

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 206 (M - 826)<3554> 16 May 1989 (1989-05-16) *

Also Published As

Publication number Publication date
ES2049048T3 (es) 1994-04-01
JP3040464B2 (ja) 2000-05-15
WO1991008386A1 (fr) 1991-06-13
DE59004353D1 (de) 1994-03-03
DE4016462A1 (de) 1991-06-13
EP0456772A1 (fr) 1991-11-21
KR0174251B1 (ko) 1999-03-20
KR920701629A (ko) 1992-08-12
JPH04503849A (ja) 1992-07-09

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