EP0408915B1 - Pompe d'injection pour moteurs à combustion interne - Google Patents

Pompe d'injection pour moteurs à combustion interne Download PDF

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Publication number
EP0408915B1
EP0408915B1 EP90111723A EP90111723A EP0408915B1 EP 0408915 B1 EP0408915 B1 EP 0408915B1 EP 90111723 A EP90111723 A EP 90111723A EP 90111723 A EP90111723 A EP 90111723A EP 0408915 B1 EP0408915 B1 EP 0408915B1
Authority
EP
European Patent Office
Prior art keywords
pump
flow
throttle
section
passage
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
EP90111723A
Other languages
German (de)
English (en)
Other versions
EP0408915A1 (fr
Inventor
Dominique Buisson
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 EP0408915A1 publication Critical patent/EP0408915A1/fr
Application granted granted Critical
Publication of EP0408915B1 publication Critical patent/EP0408915B1/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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/007—Venting means

Definitions

  • the invention relates to an electrically controlled pump nozzle according to the preamble of claim 1.
  • control valve may become blocked, i.e. that it gets stuck in this switch position. Then there is the possibility that fuel is still led into the pump work space by sucking back fuel by means of the pump piston. This can be done, for example, via a check valve that is no longer fully closed, which is intended to decouple the pump work space from the tank, or via a continuously open throttle in the return line. If the injection process continues unintentionally, there is a risk that the motor vehicle operated by the internal combustion engine will get out of control. This must be prevented.
  • the pump nozzle according to the invention with the characterizing features of claim 1 has the advantage that the problem occurring in the prior art is solved in a safe manner.
  • the venturi pump which works as a jet pump, puts the pump work space under negative pressure, as a result of which fuel is withdrawn from the pump work space and thus an unwanted injection is reliably prevented.
  • the features of claim 3 additionally ensure cooling of the control valve without interfering with the mode of operation of the venturi pump, with simultaneous decoupling of the control surges from the control valve.
  • damping of the actuator movement of the control valve is achieved.
  • the embodiment of the electrically controlled pump nozzle according to the invention shown in the drawing consists of a piston injection pump 10, which is mechanically driven in a manner not shown but is known to be driven by a camshaft, the pump housing of which is driven by a constant stroke and in a Cylinder bore 11 receives pump piston 12 and on the end carries an injection nozzle 14 of a known type, which is therefore not shown in more detail, which is fastened by means of a dashed-dot screw sleeve 19 with the interposition of a pressure valve 13.
  • the pump piston 12 is driven by known drive means, which are therefore only indicated by an arrow 15, via a pump tappet against the restoring force of a tappet spring.
  • the pump piston 12 delimits, with its end face 16, a pump working chamber 17 located in the cylinder bore 11, which is closed by the pressure valve 13 on the injection nozzle side and can be connected to the injection nozzle 14 via a pressure channel 18.
  • This pressure valve 13 can also be omitted because of the short length of the pressure channel 18 between the pump work chamber 17 and the injector 14.
  • the pump work chamber 17 is in the designated bottom dead center position UT of the pump piston 12 by a feed pump 20 with a low inlet pressure of z. B. 4 bar of fuel supplied.
  • the fuel reaches a control valve 24 via a throughflow section 22 formed as part of a throughflow line 21 with a low pressure chamber 23 therein, which in the open position shown shows the fuel via a further part of the throughflow line 21, a throughflow channel 25 , passes to the pump work space 17.
  • a partial flow of the fuel delivered by the feed pump 20 passes via a connecting section 26 branching off from the throughflow section 22 to a venturi pump 28 with a throughflow throttle 29 located in the flow direction, which opens on the outflow side into a return line 31 leading to a tank 30.
  • the actuator 35 is surrounded by a rinsing chamber 36 which is connected on the one hand to the flow section 22 via a rinsing line 37 and on the other hand to the return line 31 via an outlet channel 38.
  • the flushing volume flowing through the flushing chamber 36 is limited by a metering throttle 39 inserted into the flushing line 37 and can be additionally influenced via a dashed orifice 40 located in the outlet channel 38, the flow cross-section of which is equal to or smaller than that of the metering restrictor 39.
  • the metering throttle 39 and the outlet throttle 40 can also be replaced by a corresponding choice of the flow cross section of the lines receiving them.
  • the lost heat of the actuator 35 is dissipated via the permanent flushing of the flushing chamber 36 and, via the dimensioning of the flow cross sections of the metering throttle 39 on the one hand and the outlet throttle 40 on the other hand, a small back pressure is generated in the flushing chamber 36, which leads to a damped switching behavior of the control valve. Furthermore, the metering throttle 39 weakens the control pressure surges which occur when the control valve 24 is reversed due to the relief of the pump work space 17, as a result of which the operational reliability of the control valve 24 is increased.
  • the power supply to the actuator 35 of the control valve 24 is switched off in accordance with the operating data determined in an electronic control device.
  • the control valve 24 is switched over to its drawn open position.
  • the pump work space 17 is relieved of pressure in the low pressure space 23 and the pressure in the pump work space 17 drops suddenly.
  • the pressure valve 13 and the injector 14 close, so that the injection is finished.
  • the flow cross sections of the flow restrictor 29 and the suction restrictor 32 are coordinated so that with a receding pump piston 12 towards the bottom dead center position UT even with open ner annular groove 34, a rapid fuel filling of the pump work space 17 and then a flushing of the pump work space 17 to cool it and to remove air and steam bubbles.
  • the pump piston 12 would be able, if the venturi nozzle 28 was not present, to use the fuel which it received, for example, via leakage currents as a result of part tolerances, defective components or the volume of lines or filters, so it is also available via the return line 31 and the connecting channel 33 to undesirably continue the injection.
  • the open-controlled Annular groove 34 withdraws fuel from the pump work chamber 17 via the suction effect of the venturi pump 28 and generates a negative pressure, by means of which an uncontrolled injection is prevented.

Landscapes

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

Claims (4)

  1. Pompe (10) d'injection de carburant à commande électrique, pour moteurs à combustion interne, en particulier pour moteur diesel, comportant au moins un piston de pompe (12) entraîné à course constante, délimitant une chambre de travail (17) et alimentant à chaque course active, sous pression un injecteur (14) à partir du carburant amené à la pression par une pompe d'alimentation (20), une soupape de commande (24) à commande électrique, montée entre une section de conduite (22) reliée à la pompe d'alimentation (20) et présentant une chambre à basse pression (23) et un canal (25), relié en permanence à la chambre de travail (17) et faisant partie d'une conduite de circulation (21), cette soupape pouvant, pour régler la durée de l'injection, couper la liaison existant entre la section (22) et le canal (25) servant à alimenter la chambre (17), une canalisation de retour (31) au réservoir (30) de carburant en excès, raccordée à la chambre (17), seulement au point mort bas UT du piston de pompe (12), par un canal de liaison (33) piloté par le piston, caractérisée en ce que sont reliés par une pompe à venturi (28) fonctionnant en éjecteur, reliée en amont par une liaison (26) à la section (22) de la conduite de circulation (21), en aval à la canalisation de retour (31), et côté aspiration à la chambre de travail (17) par le canal de liaison (33).
  2. Pompe à injection selon la revendication 1, caractérisée en ce que la pompe à venturi (28) comporte un étranglement (29) d'une certaine section et un étranglement d'aspiration (32) de section plus faible, débouchant de préférence à angle droit dans l'étranglement (29), l'étranglement (29) reliant la section (26) à la canalisation de retour (31) tandis que l'étranglement d'aspiration (32) relie la chambre de travail (17) à l'étranglement (29).
  3. Pompe à injection selon la revendication 1 ou 2, dont la soupape de commande (24) est enfoncée dans la zone de son organe de commande (35) par une chambre de vidange (36) reliée par une conduite de vidange (37) à la section (22) de la conduite de vidange (21), caractérisée en ce que la conduite de vidange (purge) (37) est équipée d'un étranglement doseur, limitant l'alimentation de la chambre de vidange (36), et dont la section est inférieure à celle de l'étranglement (29) de la pompe à venturi (28), la chambre de vidange (36) étant reliée par un canal de décharge (38) à la canalisation de retour (31).
  4. Pompe à injection selon la revendication 3, caractérisée en ce que le canal de décharge (38) est équipé d'un étranglement (40) dont la section est établie en fonction de celle de l'étranglement (39) de sorte qu'il existe dans la chambre de vidange (36) une pression de retenue.
EP90111723A 1989-07-20 1990-06-21 Pompe d'injection pour moteurs à combustion interne Expired - Lifetime EP0408915B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3924127A DE3924127A1 (de) 1989-07-20 1989-07-20 Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3924127 1989-07-20

Publications (2)

Publication Number Publication Date
EP0408915A1 EP0408915A1 (fr) 1991-01-23
EP0408915B1 true EP0408915B1 (fr) 1992-12-02

Family

ID=6385518

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90111723A Expired - Lifetime EP0408915B1 (fr) 1989-07-20 1990-06-21 Pompe d'injection pour moteurs à combustion interne

Country Status (4)

Country Link
US (1) US4982713A (fr)
EP (1) EP0408915B1 (fr)
JP (1) JPH0357874A (fr)
DE (2) DE3924127A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4211651B4 (de) * 1992-04-07 2004-11-18 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung, insbesondere Pumpedüse für Brennkraftmaschinen
FR2695169B1 (fr) * 1992-08-27 1994-11-04 Melchior Jean Dispositif d'injection de combustible liquide pour moteur à combustion interne et moteur équipé d'un tel dispositif.
JPH0626161U (ja) * 1992-09-02 1994-04-08 株式会社寺田電機製作所 圧接型端子
EP0590362B1 (fr) * 1992-09-29 1996-10-23 Steyr Nutzfahrzeuge Ag Agencement de came d'entraînement pour entrainer le piston d'une pompe d'injection pour un moteur à combustion interne
DE4332119B4 (de) * 1993-09-22 2006-04-20 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
EP0893598B1 (fr) * 1997-07-26 2003-05-28 Delphi Technologies, Inc. Système de combustible
SE521406C2 (sv) * 1998-10-23 2003-10-28 Scania Cv Ab Bränsleinsprutningsanordning för förbränningsmotor
GB0119218D0 (en) * 2001-08-07 2001-09-26 Delphi Tech Inc Fuel injector
GB0209146D0 (en) * 2002-04-22 2002-05-29 Delphi Tech Inc Fuel pump
US7690361B2 (en) 2007-09-28 2010-04-06 Cummins Inc. System and method for metering fuel in a high pressure pump system
FI122557B (fi) * 2009-04-02 2012-03-30 Waertsilae Finland Oy Mäntämoottorin polttoaineenruiskutusjärjestely

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2312860A1 (de) * 1973-03-15 1974-09-19 Daimler Benz Ag Vorrichtung zum schnellen abstellen von einspritzbrennkraftmaschinen
DE2558790A1 (de) * 1975-12-24 1977-07-14 Bosch Gmbh Robert Kraftstoffeinspritzduese fuer brennkraftmaschinen
AT378242B (de) * 1981-07-31 1985-07-10 Berchtold Max Prof Kraftstoffeinspritzanlage fuer brennkraftmaschinen, insbesondere dieselmotoren
US4665881A (en) * 1981-12-28 1987-05-19 Ford Motor Company Heated fuel injection system
DE3304335A1 (de) * 1983-02-09 1984-08-09 Robert Bosch Gmbh, 7000 Stuttgart Steuereinrichtung zum stillsetzen einer brennkraftmaschine
FR2541379B1 (fr) * 1983-02-21 1987-06-12 Renault Perfectionnement aux systemes d'injection a commande electromagnetique pour moteur diesel de type pression-temps ou l'aiguille de l'injecteur est pilotee par la decharge puis la charge d'une capacite
US4603671A (en) * 1983-08-17 1986-08-05 Nippon Soken, Inc. Fuel injector for an internal combustion engine
US4640252A (en) * 1984-01-28 1987-02-03 Mazda Motor Corporation Fuel injection system for diesel engine
JPS60204961A (ja) * 1984-03-29 1985-10-16 Mazda Motor Corp デイ−ゼルエンジンの燃料噴射装置
DE3433710A1 (de) * 1984-09-14 1986-03-27 Robert Bosch Gmbh, 7000 Stuttgart Elektrisch gesteuerte pumpeduese fuer die kraftstoffeinspritzung bei dieselbrennkraftmaschinen
CH668621A5 (de) * 1986-01-22 1989-01-13 Dereco Dieselmotoren Forschung Kraftstoffeinspritzanlage fuer eine brennkraftmaschine.
US4637351A (en) * 1986-03-28 1987-01-20 Ford Motor Company System for removal of water from diesel fuel systems
JPH0759919B2 (ja) * 1986-04-04 1995-06-28 日本電装株式会社 デイ−ゼルエンジン用燃料噴射制御装置
DE3719831A1 (de) * 1987-06-13 1988-12-22 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
JPH01187363A (ja) * 1988-01-21 1989-07-26 Toyota Motor Corp 内燃機関用燃料噴射弁

Also Published As

Publication number Publication date
US4982713A (en) 1991-01-08
EP0408915A1 (fr) 1991-01-23
DE59000535D1 (de) 1993-01-14
JPH0357874A (ja) 1991-03-13
DE3924127A1 (de) 1991-01-31

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