EP0070558B1 - Kraftstoffeinspritzpumpe - Google Patents

Kraftstoffeinspritzpumpe Download PDF

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Publication number
EP0070558B1
EP0070558B1 EP82106523A EP82106523A EP0070558B1 EP 0070558 B1 EP0070558 B1 EP 0070558B1 EP 82106523 A EP82106523 A EP 82106523A EP 82106523 A EP82106523 A EP 82106523A EP 0070558 B1 EP0070558 B1 EP 0070558B1
Authority
EP
European Patent Office
Prior art keywords
fuel
distributor shaft
fuel injection
switching valve
control groove
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
Application number
EP82106523A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0070558A1 (de
Inventor
Jean Leblanc
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 EP0070558A1 publication Critical patent/EP0070558A1/de
Application granted granted Critical
Publication of EP0070558B1 publication Critical patent/EP0070558B1/de
Expired 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
    • 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
    • F02M59/205—Quantity of fuel admitted to pumping elements being metered by an auxiliary metering device
    • 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
    • F02M41/02—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements
    • F02M41/06—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements the distributor rotating
    • F02M41/063—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements the distributor rotating the distributor and rotary valve controlling fuel passages to pumping elements being combined
    • 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
    • F02M41/02—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements
    • F02M41/06—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements the distributor rotating
    • F02M41/063—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements the distributor rotating the distributor and rotary valve controlling fuel passages to pumping elements being combined
    • F02M41/066—Arrangements for adjusting the rotary valve-distributor

Definitions

  • the invention relates to a fuel injection pump according to the preamble of the main claim.
  • a known fuel injection pump of this type (DE-PS 1 303 637)
  • the distributor for quantity determination is axially displaced by a mechanical speed regulator and rotated relative to the drive shaft during its longitudinal displacement for the start of injection adjustment.
  • This relatively complex regulation has the disadvantage that, due to the rigid assignment of the control variables, an adaptation to the requirements of the engine manufacturers, inter alia, in the reduction of noise, fuel consumption and poisonous portion of the exhaust gas cannot be achieved.
  • the fuel injection pump according to the invention with the characterizing features of the main claim has the advantage of forming the basis for an extremely flexible injection pump control.
  • this basis almost all of the requirements of the internal combustion engine manufacturers can be met in consideration of engine parameters such as consumption, temperature, exhaust gas, etc.
  • the standard effort required for this is relatively small and extremely flexible.
  • the combination of the switching valve and the control edges of the control groove, which are guided synchronously with the pump speed, can substantially avoid an adverse, uncontrolled influence of the speed on the fuel metering, as is the case due to the constant switching times of fuel injection pumps controlled by solenoid valves, with extremely versatile influences on the injection.
  • a distributor shaft 2 and radially arranged pump pistons 3 are mounted in the housing 1 of a fuel injection pump.
  • the pump pistons 3 are driven via a cam ring 4, which surrounds the pistons in a pot-shaped manner and is firmly connected to the drive shaft of the fuel injection pump, not shown.
  • the distributor shaft 2 Via a clutch, not shown, the distributor shaft 2 is carried along by the drive shaft, but the distributor shaft 2 is axially displaceable in the housing 1.
  • an annular groove 5 is arranged, which delimits the pump working spaces 6 with the pistons 3.
  • longitudinal grooves are connected, of which a longitudinal groove 7 cooperates as a distributor groove with the delivery lines 8, which lead to the fuel injection nozzles 9 on the internal combustion engine and are opened one after the other through the distributor groove 7.
  • the distributor groove 7 can be designed as a long longitudinal groove branching off from the annular groove 5 or can be made shorter via a longitudinal channel 21 and two radial channels 22, 23 of the distributor shaft with the annular groove 5 (shown in dashed lines in FIG. 1).
  • 2 control grooves 10 are arranged on the lateral surface of the distributor shaft, which are connected to the annular groove 5 and extend slightly obliquely with respect to a surface line of the distributor shaft 2.
  • control grooves control a fuel supply opening 13 which opens into the cylinder 14 guiding the distributor shaft 2 and represents the end of a pressure channel 11 which is supplied with fuel by a fuel feed pump 12.
  • An electrically actuated switching valve 16 is arranged in the pressure channel, which preferably has a slide as a valve closing element and is therefore pressure-balanced. In particular, however, this valve should be of a type that can perform fast switching operations.
  • the delivery pressure of the fuel delivery pump is kept at a constant value by means of a pressure control valve 17.
  • the distributor shaft 2 is longitudinally displaceable, which is done with the aid of an electrical adjusting device 18.
  • This device is shown only schematically in the drawing and acts on the rotating distributor shaft via a point-like contact surface.
  • FIG. 2 For a more detailed explanation of the function, five different rotational positions A, B, C, D and E are shown in FIG. 2, each of which represents the rotational positions in the sectional planes I, 11 and 111 of the fuel injection pump according to FIG. 1 in a schematic juxtaposition.
  • the distributor shaft 2 is cut in the area of the pump pistons 3.
  • the sectional plane 11 passes through the fuel supply opening 13 and the sectional plane 111 lies in the confluence plane of the delivery lines 8.
  • a cam 24 of the cam ring 4 is also shown in its assignment to the pump piston 3, between the pumps piston 3 and the cam 24 a roller 25 is switched in a known manner.
  • the illustration A shows the rotational position of the distributor shaft 2 at the start of filling the pump work spaces 6 with fuel. At this point the roller 25 has reached the highest elevation of the cam 24 and is to be followed in the concept of the falling flank of the cam. The pump piston is moved outwards and the pump working space 6 is enlarged.
  • the switching valve 16 is at this time in the open position and the control groove 10 has just opened the connection to the pressure channel 11. Fuel can thus enter the annular groove 5 via the control groove 10 and from there into the pump work spaces 6. The fuel pressure ensures that the rollers 25 remain in contact with the cams 24.
  • the representation B shows the moment at which the switching valve 16 is closed. From this point in time, although the control groove 10 is still in connection with the pressure channel 11, the supply of fuel is stopped, so that the pump piston 3 maintains the position it has assumed at that point in time and lifts off the cam. This is the end of the metering.
  • the next cam 24 ' has now reached the roller 25, which in the course of the further movement of the cam 24' moves the pump piston 3 inwards.
  • the pump pistons 3 now carry out the delivery stroke and press the fuel via the longitudinal channel 21 and the radial channel 22 into the longitudinal groove 7, which is now connected to one of the delivery lines 8.
  • the delivered fuel is pressed into this and brought to the injection point at the internal combustion engine.
  • the pressure channel 11 is still blocked by the distributor shaft and the switching valve 16 is open.
  • the representation E shows the end of the injection, which is reached when the control groove 10 is brought back into connection with the pressure channel 11.
  • the distributor groove 7 is still connected to the delivery line 8
  • the fuel delivery is now interrupted, since the remaining fuel delivered by the pump piston 3 can flow off to the fuel supply side via the pressure channel.
  • a further channel 26 can be provided, which bypasses the switching valve 16 and contains a check valve 27. In this way, the control cross-section is enlarged and it is ensured that the injection is stopped suddenly. This last phase is then followed by phase A and the process described above is repeated.
  • the fuel injection quantity per stroke can be determined solely by the switching valve 16.
  • the metering phase is determined on the one hand by opening the pressure line 11 with a speed-controlled control edge of the control groove 10 and on the other hand by closing the switching valve 16.
  • This Control type leads to changing injection start times with variable injection quantity.
  • the end of the spray can be kept constant.
  • Another control option is that a constant amount of fuel is constantly metered through the switching valve 16, whereby a constant injection timing is achieved and that the distributor shaft 2 is shifted to vary the fuel injection amount.
  • the shift changes the point at which the control groove 10 is reconnected to the pressure line 11 at the end of the injection phase. The position of the end of injection is therefore variable.
  • This control also has the advantage that the metering is not dependent on the switching times of the switching valve.

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)
EP82106523A 1981-07-22 1982-07-20 Kraftstoffeinspritzpumpe Expired EP0070558B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813128975 DE3128975A1 (de) 1981-07-22 1981-07-22 Kraftstoffeinspritzpumpe
DE3128975 1981-07-22

Publications (2)

Publication Number Publication Date
EP0070558A1 EP0070558A1 (de) 1983-01-26
EP0070558B1 true EP0070558B1 (de) 1984-10-31

Family

ID=6137494

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82106523A Expired EP0070558B1 (de) 1981-07-22 1982-07-20 Kraftstoffeinspritzpumpe

Country Status (5)

Country Link
US (1) US4501246A (enrdf_load_stackoverflow)
EP (1) EP0070558B1 (enrdf_load_stackoverflow)
JP (1) JPS5825565A (enrdf_load_stackoverflow)
BR (1) BR8204235A (enrdf_load_stackoverflow)
DE (2) DE3128975A1 (enrdf_load_stackoverflow)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3243348A1 (de) * 1982-11-24 1984-05-24 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe
DE3412834A1 (de) * 1984-04-05 1985-10-24 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe
DE3612942A1 (de) * 1986-04-17 1987-10-22 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3722265A1 (de) * 1987-07-06 1989-01-19 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
US5098260A (en) * 1990-04-23 1992-03-24 Cummins-Engine Company, Inc. Position-servo device for positioning a stop in a positive displacement fuel injection system
US5215449A (en) * 1991-12-05 1993-06-01 Stanadyne Automotive Corp. Distributor type fuel injection pump
WO1997001031A1 (en) 1995-06-23 1997-01-09 Diesel Technology Company Fuel pump and method of operating same
US5954487A (en) * 1995-06-23 1999-09-21 Diesel Technology Company Fuel pump control valve assembly
US6089470A (en) * 1999-03-10 2000-07-18 Diesel Technology Company Control valve assembly for pumps and injectors
US6158419A (en) * 1999-03-10 2000-12-12 Diesel Technology Company Control valve assembly for pumps and injectors
US6450778B1 (en) 2000-12-07 2002-09-17 Diesel Technology Company Pump system with high pressure restriction
DE602004002105T2 (de) * 2004-06-30 2007-02-08 C.R.F. S.C.P.A. Hochdruckpumpe mit variabler Förderrate für ein Brennstoffeinspritzsystem

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2077259A (en) * 1931-05-22 1937-04-13 Joseph Schidlovsky Fuel injecting device for internal combustion engines
US2356627A (en) * 1940-06-27 1944-08-22 George A Rubissow Interruption injection pump
FR1387296A (fr) * 1963-12-19 1965-01-29 Sigma Perfectionnements apportés aux pompes d'injection de combustible à distributeur rotatif
FR1449640A (fr) * 1965-04-01 1966-05-06 Bosch Gmbh Robert Perfectionnements apportés aux pompes d'injection de combustible à distributeur rotatif
DE1919707A1 (de) * 1969-04-18 1970-11-12 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer mehrzylindrige Brennkraftmaschinen
DE2503346C2 (de) * 1975-01-28 1986-04-03 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffverteilereinspritzpumpe für Brennkraftmaschinen
JPS6032021B2 (ja) * 1976-12-26 1985-07-25 株式会社デンソー 噴射ポンプ制御装置
GB1603415A (en) * 1977-04-30 1981-11-25 Lucas Industries Ltd Liquid fuel injection pumps
DE3000977A1 (de) * 1980-01-12 1981-07-23 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzeinrichtung fuer brennkraftmaschinen, insbesondere fuer dieselmotoren
US4382751A (en) * 1980-02-14 1983-05-10 Lucas Industries Limited Fuel pumping apparatus
DE3017276A1 (de) * 1980-05-06 1981-11-12 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3118669A1 (de) * 1980-07-01 1982-04-08 Robert Bosch Gmbh, 7000 Stuttgart "verfahren und einrichtung zur kraftstoffeinspritzung bei brennkraftmaschinen, insbesondere bei dieselmotoren"
DE3024963A1 (de) * 1980-07-02 1982-01-28 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzeinrichtung fuer brennkraftmaschinen, insbesondere fuer dieselmotoren

Also Published As

Publication number Publication date
DE3261137D1 (en) 1984-12-06
BR8204235A (pt) 1983-07-12
JPS5825565A (ja) 1983-02-15
JPH024780B2 (enrdf_load_stackoverflow) 1990-01-30
EP0070558A1 (de) 1983-01-26
DE3128975A1 (de) 1983-02-10
US4501246A (en) 1985-02-26

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