EP0240686A1 - Pompe d'injection de combustible pour moteurs à combustion interne à recirculation des gaz d'échappement - Google Patents

Pompe d'injection de combustible pour moteurs à combustion interne à recirculation des gaz d'échappement Download PDF

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Publication number
EP0240686A1
EP0240686A1 EP87102705A EP87102705A EP0240686A1 EP 0240686 A1 EP0240686 A1 EP 0240686A1 EP 87102705 A EP87102705 A EP 87102705A EP 87102705 A EP87102705 A EP 87102705A EP 0240686 A1 EP0240686 A1 EP 0240686A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection pump
outlet
control element
channel
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
EP87102705A
Other languages
German (de)
English (en)
Other versions
EP0240686B1 (fr
Inventor
Karl Konrath
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 EP0240686A1 publication Critical patent/EP0240686A1/fr
Application granted granted Critical
Publication of EP0240686B1 publication Critical patent/EP0240686B1/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
    • F02M41/125—Variably-timed valves controlling fuel passages
    • F02M41/126—Variably-timed valves controlling fuel passages valves being mechanically or electrically adjustable sleeves slidably mounted on rotary piston
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
    • F02M26/62—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to fuel pressure

Definitions

  • the invention is based on a fuel injection pump for internal combustion engines with exhaust gas recirculation according to the preamble of claim 1.
  • the speed adjustment lever is assigned a sensor which, depending on the position of the speed adjustment lever, has an electrical one Signal generated, based on which the exhaust gas recirculation valve is controlled so that it is open in the partial load range of the internal combustion engine and closed in the full load range.
  • the assignment of the sensor to the adjusting lever influencing the speed of the internal combustion engine represents a compromise, since the respective position of the adjusting lever does not directly correspond to a specific load range of the internal combustion engine.
  • it is essential that the exhaust gas recirculation valve is controlled directly as a function of the actual operating load range of the internal combustion engine.
  • the fuel injection pump according to the invention with the characterizing features of claim 1 has the advantage that for controlling the exhaust gas recirculation valve, the position of the control slide, which is directly decisive for the metering of the injection quantity required for the respective load condition, is used as a measure of the operating load of the internal combustion engine. Another advantage is that, apart from determining the distance of the outlet of the relief channel from the inlet of the other channel in the pump piston, no adjustment or assignment work is required. Another advantage is that the speed-dependent delivery pressure of a delivery pump, which also prevails in the suction chamber of the injection pump receiving the control slide, is used to convert the position of the control slide into an electrical signal.
  • the embodiment of claim 7 provides a simple possibility of arranging the control element at a convenient location on the pump housing, depending on the requirements.
  • a cylinder liner 3 is inserted, in the cylinder 2 of which a pump piston 4 is displaceable, which is set into a reciprocating and at the same time rotating movement by a drive (not shown).
  • the pump piston 4 closes off one end of a pump working chamber 5 and protrudes with its other end out of the cylinder liner 3 into a suction chamber 7 of the housing 1. At this end, the pump piston 4 is connected to the drive (not shown).
  • the pump work chamber 5 is supplied with fuel from the pump suction chamber 7 via longitudinal grooves 8 arranged in the lateral surface of the pump piston 4 and a suction bore 9 running through the cylinder liner 3 and the housing 1, as long as the pump piston 4 executes its suction stroke or its lower one shown in FIG. 1 Dead center position.
  • a feed pump 10 feeds fuel from a fuel reservoir 11 into the suction space 7 of the housing 1 as the pressure increases as a function of the speed.
  • a pressure control valve 12 connected in parallel with the feed pump 10 controls the pressure in the pump suction space 7 in a known manner as a function of the speed.
  • a radial bore 16 branches off from this relief channel 15 and leads to a distributor groove 17 in the lateral surface of the pump piston 4.
  • a plurality of delivery lines 18 branch off in a radial plane of the cylinder 2 and are arranged distributed uniformly on the circumference of the cylinder 2 in accordance with the number of cylinders of the assigned internal combustion engine to be supplied with fuel.
  • the delivery lines 18 lead to the fuel injection points, not shown, of the internal combustion engine.
  • a radial bore 20 branches off from the relief channel 15 and forms an outlet A in the outer surface of the pump piston 4.
  • an annular regulating slide 21 is displaceably arranged on the pump piston 4 as a quantity adjusting member, the end face of which faces the cylinder liner 3.
  • Control edge 22 for the outlet A forms.
  • the control slide 21 is a control device, not shown, due to several operating parameters, such as the desired speed, speed, air pressure, temperature and. Like. Axially adjusted to the pump piston 4 via a control lever 23. The control slide 21 assumes a position shown in FIG.
  • the pump piston 4 there is also a second channel 25, from which a radial bore 26 with an outlet B branches off in the area of the pump piston section which is always in the cylinder 2 and a radial bore 27 with an inlet E branches off in the witch area of the control slide 21.
  • the inlet E of the channel 25 za the control edge 22 of the control slide 21 has a distance sZ which is greater than the distance s V of the Outlet A of the relief duct 15 from the control edge 22, so that the inlet E of the duct 25 is offset from the outlet A of the relief duct 15 by a certain distance.
  • annular groove 28 is arranged in the cylinder liner 3, which is connected via a radial bore 29 in the cylinder liner 3 and a bore 30 to a blind bore 31.
  • a bore 32 branches off from the blind bore 31 to an outflow throttle 33, from which a line 34 leads to the unpressurized fuel reservoir 11.
  • a pressure switch 35 is screwed into the blind bore 31, which closes an electrical contact 37 at a pressure which is in the range of the delivery pressure prevailing in the suction chamber 7 and thus generates an electrical signal for controlling an exhaust gas recirculation valve of the internal combustion engine.
  • the application of fuel to the pressure switch 35 from the suction space 7 and the pressure prevailing there is controlled as a function of the position of the control slide 21.
  • the inlet of the channel 25, which is connected to the pressure switch 35 via the annular groove 28 and the bores 29 and 30, is not opened when the control slide 21 is in the fully loaded position during the remaining stroke of the pump piston 4 after opening A has been opened, so that the pressure-relieved via the outflow throttle 33 blind bore 31 and thus the pressure switch 35 are depressurized.
  • the inlet E of the channel 25 is opened towards the end of the pressure stroke of the pump piston 4, so that the pressure in the suction space 7 through the channel 25 and the bores 29, 30 can act on the pressure switch 35.
  • the contact 37 of the pressure switch 35 is closed, so that an electrical control signal is generated that can be used directly to open the exhaust gas recirculation valve of the internal combustion engine or serves as a control signal.
  • a throttle 36 can be arranged in the radial bore 29 in the cylinder liner 3.
  • a pressure-sensitive sensor element can be arranged instead of the pressure switch, which sensor element emits a proportional electrical signal depending on the control pressure.
  • control element for emitting an electrical signal for controlling an exhaust gas recirculation valve is shown in the described exemplary embodiment in connection with an injection pump in which the respective injection quantity in the different load ranges by means of the control slide 21 by canceling the injection quantity delivery to an earlier or later one Point before the top dead center of the pump piston 4 is dimensioned.
  • the device described for generating an electrical signal can, however, also be provided on those injection pumps in which, in a manner known per se, the start of delivery by the pump piston is recorded after a more or less large idle stroke of the pump piston.
  • the inlet of the channel leading to the control element is to be arranged on the pump piston in such a way that it is only open when the outlet of the relief channel is open.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP87102705A 1986-04-10 1987-02-26 Pompe d'injection de combustible pour moteurs à combustion interne à recirculation des gaz d'échappement Expired - Lifetime EP0240686B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863612068 DE3612068A1 (de) 1986-04-10 1986-04-10 Kraftstoffeinspritzpumpe fuer brennkraftmaschinen mit abgasrueckfuehrung
DE3612068 1986-04-10

Publications (2)

Publication Number Publication Date
EP0240686A1 true EP0240686A1 (fr) 1987-10-14
EP0240686B1 EP0240686B1 (fr) 1990-05-02

Family

ID=6298389

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87102705A Expired - Lifetime EP0240686B1 (fr) 1986-04-10 1987-02-26 Pompe d'injection de combustible pour moteurs à combustion interne à recirculation des gaz d'échappement

Country Status (4)

Country Link
US (1) US4718385A (fr)
EP (1) EP0240686B1 (fr)
JP (1) JPS62261662A (fr)
DE (2) DE3612068A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3644147A1 (de) * 1986-12-23 1988-07-07 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3644583A1 (de) * 1986-12-27 1988-07-07 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3740968C1 (de) * 1987-12-03 1988-12-15 Bosch Gmbh Robert Abgasrueckfuehreinrichtung fuer Brennkraftmaschinen
DE4106813A1 (de) * 1991-03-04 1992-09-10 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE19713868A1 (de) * 1997-04-04 1998-10-08 Bosch Gmbh Robert Kraftstoffeinspritzpumpe für Brennkraftmaschinen
US6050248A (en) * 1997-12-03 2000-04-18 Caterpillar Inc. Exhaust gas recirculation valve powered by pressure from an oil pump that powers a hydraulically actuated fuel injector
US5865156A (en) * 1997-12-03 1999-02-02 Caterpillar Inc. Actuator which uses fluctuating pressure from an oil pump that powers a hydraulically actuated fuel injector
US6148805A (en) * 1998-12-15 2000-11-21 Caterpillar Inc. Engine with hydraulic fuel injection and EGR valve using a single high pressure pump
JP3771454B2 (ja) * 2001-02-21 2006-04-26 本田技研工業株式会社 内燃機関の制御装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2031997A (en) * 1978-09-26 1980-04-30 Bosch Gmbh Robert Air/fuel ratio regulating system for an internal combusti on engine
DE2855027A1 (de) * 1976-12-22 1980-07-10 Bosch Gmbh Robert Einrichtung zur betaetigung eines auf eine abgasrueckfuehrsteuereinrichtung wirkenden stellorgans bei brennkraftmaschinen
GB2063997A (en) * 1979-11-17 1981-06-10 Bosch Gmbh Robert An Exhaust Gas Recycling Control Arrangement for Use with an Internal Combustion Engine

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2353737A1 (de) * 1973-10-26 1975-05-07 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE2448693C2 (de) * 1974-10-12 1983-11-24 Robert Bosch Gmbh, 7000 Stuttgart Drehzahlregler für eine Verteilereinspritzpumpe
US4090950A (en) * 1977-04-26 1978-05-23 Sun Petroleum Products Company Process for manufacturing refrigeration oils
JPS5627058A (en) * 1979-08-13 1981-03-16 Toyota Motor Corp Exhaust gas recycling controller in internal combustion engine
DE3013087A1 (de) * 1980-04-03 1981-10-15 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer selbstzuendende brennkraftmaschinen
JPS57137644A (en) * 1981-02-19 1982-08-25 Mazda Motor Corp Exhaust gas recirculation device for diesel engine
US4411242A (en) * 1981-04-03 1983-10-25 Nippon Soken, Inc. Method and apparatus for controlling EGR in internal combustion engine
DE3135234A1 (de) * 1981-09-05 1983-03-17 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur lastabhaengigen betaetigung eines stellorgans einer brennkraftmaschine
DE3138606A1 (de) * 1981-09-29 1983-04-14 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
JPS5885353A (ja) * 1981-11-17 1983-05-21 Nissan Motor Co Ltd 内燃機関の排気還流制御装置
DE3203582A1 (de) * 1982-02-03 1983-08-11 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
US4537170A (en) * 1984-02-28 1985-08-27 Diesel Kiki Co., Ltd. Distribution type fuel injection pump
DE3424883A1 (de) * 1984-07-06 1986-02-06 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
JP3363031B2 (ja) * 1996-06-24 2003-01-07 株式会社クボタ スラグの洗浄方法及びスラグ洗浄装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2855027A1 (de) * 1976-12-22 1980-07-10 Bosch Gmbh Robert Einrichtung zur betaetigung eines auf eine abgasrueckfuehrsteuereinrichtung wirkenden stellorgans bei brennkraftmaschinen
GB2031997A (en) * 1978-09-26 1980-04-30 Bosch Gmbh Robert Air/fuel ratio regulating system for an internal combusti on engine
GB2063997A (en) * 1979-11-17 1981-06-10 Bosch Gmbh Robert An Exhaust Gas Recycling Control Arrangement for Use with an Internal Combustion Engine

Also Published As

Publication number Publication date
DE3612068A1 (de) 1987-10-15
DE3762536D1 (de) 1990-06-07
EP0240686B1 (fr) 1990-05-02
JPS62261662A (ja) 1987-11-13
US4718385A (en) 1988-01-12

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