US3688754A - Fuel injection system for externally ignited internal combustion engines - Google Patents

Fuel injection system for externally ignited internal combustion engines Download PDF

Info

Publication number
US3688754A
US3688754A US53540A US3688754DA US3688754A US 3688754 A US3688754 A US 3688754A US 53540 A US53540 A US 53540A US 3688754D A US3688754D A US 3688754DA US 3688754 A US3688754 A US 3688754A
Authority
US
United States
Prior art keywords
fuel
fuel injection
control
control plunger
plunger
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
US53540A
Other languages
English (en)
Inventor
Konrad Eckert
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
Priority claimed from DE19691934703 external-priority patent/DE1934703C3/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3688754A publication Critical patent/US3688754A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/28—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for cutting-out the fuel supply to the engine or to main injectors during certain operating periods, e.g. deceleration
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/16—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors
    • F02M69/18—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors the means being metering valves throttling fuel passages to injectors or by-pass valves throttling overflow passages, the metering valves being actuated by a device responsive to the engine working parameters, e.g. engine load, speed, temperature or quantity of air
    • F02M69/22—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors the means being metering valves throttling fuel passages to injectors or by-pass valves throttling overflow passages, the metering valves being actuated by a device responsive to the engine working parameters, e.g. engine load, speed, temperature or quantity of air the device comprising a member movably mounted in the air intake conduit and displaced according to the quantity of air admitted to the engine
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/16—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors
    • F02M69/26—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors the means varying fuel pressure in a fuel by-pass passage, the pressure acting on a throttle valve against the action of metered or throttled fuel pressure for variably throttling fuel flow to injection nozzles, e.g. to keep constant the pressure differential at the metering valve

Definitions

  • a flow rate-responsive device disposed in the suction tube of an internal combustion engine angularly displaces a control plunger which has an oblique control edge and which forms part'of a f'uleterndeE'Dpedig"upon the angular position of said plunger, said control edge determines a flow ⁇ passage section for the fuel to control the air-fuel mixture.
  • This invention relates to a fuel injection system for extemally ignited internal combustion engines and is of the type wherein the fuel is injected continuously into the 'suction tube in which there are disposed in series an arbitrarily operable butterfly valve and a throttle member. The latter, actuated by the upstream and downstream pressure prevailing in the suction tube, controls a metering valve disposed in the fuel conduit and operating with a constant pressure drop.
  • the throttle member displaces the throttle needle of the fuel metering valve, the contour of which is designed in such a manner that for each flow rate of air there corresponds a predetermined flow rate of fuel.
  • the momentary flow passage section of the throttle member may be made proportionate to the momentary flow passage section of the fuel metering valve.
  • the shaping of the throttle needle contour is relatively expensive. Further, in particular, the adjustment of the throttle needle and throttle bore of the fuel metering valve with respect to the position of the throttle member, as well as the alteration of the fuel-air mixture during operation of a hot engine or for providing a rich mixture of the starting fuel quantities, are restricted to relatively narrow limits.
  • the fuel metering valve includes a control plunger which is provided with an oblique control edge and which is turnable by the throttle member. The'angular position of the control plunger determines the flow passage section for the fuel.
  • a cylindrical throttle member 2 extends transversely tothe direction of air flow into the suction tube l through an orifice 4 provided in the tube wall. It is to be understood that the said cylindrical throttle member may be replaced by a pivoting gate or a baffle plate displaceable in the direction of air flow.
  • the displacement of the throttle member 2 in the suction tube 1 is approximately a linear function of the air quantity passing through the suction tube l.
  • the pressure prevailing between the throttle member 2 and the butterfly valve 3 remains approximately constant assuming a constant pressure upstream of the throttle member 2.
  • the throttle member 2 is integral with a piston 5, the diameter of which i greater than that of the throttle member 2.
  • the piston 5 is received with a snug tit by and is displaceable in a cylinder 6.
  • the piston 5 is pulled radially outwardly of the suction tube 1 against the return force of a spring 9 by means of the vacuum prevailing in the suction tube portion la between the throttle member 2 and the butterfly valve 3.
  • the vacuum conditions prevailing in the suction tube portion 1a are communicated to cylinder 6 through a channel 8.
  • the annular space defined in the cylinder 6 by the throttle member 2 and the adjacent radial annular face of the piston 5 communicates by means of a channel 7 either with the atmosphere or, as shown, with the air inlet 1d of the suction tube 1.
  • the throttle member 2 may be associated with a membrane or any other equivalent actuating means.
  • the slope of the linear function between the displacement of the throttle member 2 and the air quantity depends upon the characteristic of the spring 9, as well as upon the frictional losses between the contacting faces of the sliding members.
  • a toothed rack 10 To the throttle member 2 there is affixed, for simultaneous displacement therewith, a toothed rack 10, the teeth of which mesh with a pinion 12 which is arranged circumferentially about a tumable control plunger 11. The latter forms the movable part of the fuel metering valve. It is thus seen that to each axial position of the throttle member 2 there corresponds a determined angular position of the control plunger 1 1.
  • annular groove 14 In the lateral face of the control plunger 11 there is provided an annular groove 14, one axial boundary of which is formed as an oblique control edge 14' for con trolling the flow passage section 22 of a preferably rectangular longitudinal groove l5.
  • a fuel pump 16 which may be driven, for example, by an electric motor (not shown), draws fuel from a tank 17 and delivers it through a conduit 18 into the annular groove 14. From the conduit 18 there extends, immediately downstream of pump 16, a return conduit 19 in which there is arranged a pressure limiting valve 20.
  • the fuel flows through the metering flow passage section 22 into the groove 15 and therefrom into a bore 23 which leads to a plunger valve 24.
  • the latter which maintains the pressure drop at the metering throttle 22 at a constant valve, includes an annular chamber 2S into which merges the bore 23 and a control plunger 26 which is actuated by a membrane 27.
  • the lateral face of the control plunger 26 is provided with an annular groove 28 which communicates with a conduit 29 leading to the fuel injection valve or valves 34 (only one shown).
  • One axial boundary of the groove 28 controls the flow passage section defined jointly by the groove 28 and the chamber 25.
  • the spaces at either side of the membrane 27 are connected hydraulically by means of conduits with locations upstream of and downstream of the metering throttle 22.
  • the space 27' in which hydraulic pressure tends to displace'the valve 24 in the closing direction upon increasing fuel pressure upstream of throttle 22, is connected by means of a conduit 30 with a conduit 18.
  • the space 27" in which hydraulic pressure tends to displace the valve 24 in the opening direction, is connected by a channel 3l with the conduit 23.
  • the control plunger 11 is axially displaceable against the force of a return spring 35 which presses it against a fixedly but adjustably held abutment 36.
  • the abutment 36 is,arbitrarily or by means of a suitable device, rotatable whereby the ratio of the flow passage section of the throttle member 2 to that of the fuel metering throttle 22 is varied. Such setting is effected for the pre-adjustment of the flow passage section ratio and also, during starting or hot run of the engine if a richer air-fuel mixture is required.
  • control plunger l1 remote from the abutment 36 is surrounded by an electromagnet 37.
  • electromagnet 37 When the latter is energized, the control plunger 11 is displaced axially against the force of a return spring 35.
  • hydraulic communication is interrupted between the annular groove 14 and the groove so that the flow of fuel into the fuel injection valve or valves 34 is cut off. This is particularly required during pushing operation to avoid an excessive ratio of poisonous matter in the exhaust and to prevent a jerky operation of the engine.
  • Each fuel injection valve 34 is provided with a closing member 38 which, during the pushing operation, is, by hydraulic pressure, displaced against the force of a return spring 39 closing thereby the nozzle opening 40. In this manner it is prevented that during the pushing operation, fuel is drawn from the fuel conduit 29. Such occurrence would again result in the aforenoted disadvantages.
  • a conduit 41 which coinmunicates with an annular groove 42 disposed on the lateral face of the control plunger 11.
  • the annulai groove 42 communicates through a channel 43 with a chamber receiving the spring 35.
  • a pressure maintaining valve 44 In channel 43 there is disposed a pressure maintaining valve 44.
  • the latter has solely the purpose to prevent the fuel present in the conduits and channels 41, 42 and 43 from escaping. It does not prevent, however, the closure member 38 of the fuel injection valve 34 from being displaced by the spring 39 into its initial position as shown when the control plunger 11 is in a position as illustrated in the drawing.
  • distributors 45 and 46 respectively, which have as many branch conduits as there are fuel injection valves 34 as sociated with the fuel injection system.
  • a fuel injection system associated with an externally ignited internal combustion engine, said system being of the type that includes (A) a suction tube through which air is drawn to said engine, (B) an arbitrarily operable butterfly valve disposed in said suction tube, (C) a throttle member disposed in said suction tube in series with said butterfly valve and displaceable as a function of the upstream and downstream air pressure (D) fuel injection means to introduce fuel into the stream of intake air for obtaining a fuel-air mixture, (E) fuel conduit means to deliver fuel to said fuel injection means and (F) a fuel metering valve operating with a constant pressure drop in said fuel conduit means and actuated by said throttle member for controlling the flow of fuel to said fuel injection means, the improvement comprising,
  • A a control plunger forming pait of said fuel metering valve, said plunger including an oblique control edge determining a flow passage section for said fuel in said fuel conduit means, said control plunger being axially displaceable for entirely closing said flow passage section to cut off fuel supply to said fuel injection means and (B) means connecting said throttle member with said control plunger for turning the latter in response to the displacement of said throttle member to vary said flow passage section.
  • An improvement as defined in claim l including A. a closing member movable in said fuel injection means for cutting off the injection of fuel when moved in a closed position,

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
US53540A 1969-07-09 1970-07-09 Fuel injection system for externally ignited internal combustion engines Expired - Lifetime US3688754A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691934703 DE1934703C3 (de) 1969-07-09 Kraftstoffeinspritzanlage für gemischverdichtende, fremdgezündete Brennkraftmaschinen Robert Bosch GmbH, 7000 Stuttgart

Publications (1)

Publication Number Publication Date
US3688754A true US3688754A (en) 1972-09-05

Family

ID=5739250

Family Applications (1)

Application Number Title Priority Date Filing Date
US53540A Expired - Lifetime US3688754A (en) 1969-07-09 1970-07-09 Fuel injection system for externally ignited internal combustion engines

Country Status (4)

Country Link
US (1) US3688754A (de)
JP (1) JPS4946005B1 (de)
FR (1) FR2054292A5 (de)
GB (1) GB1294919A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4188144A (en) * 1976-08-20 1980-02-12 Robert Bosch Gmbh Mechanism for holding and guiding a pivoting member
US4224914A (en) * 1977-09-23 1980-09-30 Robert Bosch Gmbh Fuel injection apparatus
US4240391A (en) * 1977-12-19 1980-12-23 Honda Giken Kogyo Kabushiki Kaisha Fuel supply control device for fuel injected internal combustion engine
US4266571A (en) * 1978-03-09 1981-05-12 Audi Nsu Auto Union Aktiengesellschaft Fuel metering valve
US4538577A (en) * 1979-03-22 1985-09-03 Honda Giken Kogyo Kabushiki Kaisha Fuel injection apparatus for internal combustion engine
GB2511594A (en) * 2012-11-12 2014-09-10 Hamilton Sundstrand Corp Low hysteresis fluid metering valve
CN104100414A (zh) * 2013-04-15 2014-10-15 福特环球技术公司 可变压力气体燃料调节器
US8935078B1 (en) * 2012-01-14 2015-01-13 Anthony Richard Lorts Hydraulic servo gas regulator for multi-fuel engine

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2253455A (en) * 1938-03-30 1941-08-19 Bosch Gmbh Robert Fuel injection apparatus for internal combustion engines
US2800121A (en) * 1955-11-04 1957-07-23 Orion F Fletcher Fuel injection system for internal combustion engines
US2852011A (en) * 1956-11-13 1958-09-16 Studebaker Packard Corp Fuel injection system for internal combustion engine
US2876758A (en) * 1956-11-19 1959-03-10 Acf Ind Inc Starter controlled priming system for a fuel injection operated internal combustion engine
US3036564A (en) * 1958-11-18 1962-05-29 R E T E M Rech S Et Etudes Ele Low-pressure fuel injection device
US3198498A (en) * 1961-10-09 1965-08-03 Sibe Pressure carburetors
US3320893A (en) * 1965-05-14 1967-05-23 Bosch Gmbh Robert Regulated injection pump
US3446198A (en) * 1967-07-03 1969-05-27 Ford Motor Co Integrated fuel injection and ignition distributor assembly
US3517688A (en) * 1968-10-08 1970-06-30 Scholle Container Corp Aseptic filling valve

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2253455A (en) * 1938-03-30 1941-08-19 Bosch Gmbh Robert Fuel injection apparatus for internal combustion engines
US2800121A (en) * 1955-11-04 1957-07-23 Orion F Fletcher Fuel injection system for internal combustion engines
US2852011A (en) * 1956-11-13 1958-09-16 Studebaker Packard Corp Fuel injection system for internal combustion engine
US2876758A (en) * 1956-11-19 1959-03-10 Acf Ind Inc Starter controlled priming system for a fuel injection operated internal combustion engine
US3036564A (en) * 1958-11-18 1962-05-29 R E T E M Rech S Et Etudes Ele Low-pressure fuel injection device
US3198498A (en) * 1961-10-09 1965-08-03 Sibe Pressure carburetors
US3320893A (en) * 1965-05-14 1967-05-23 Bosch Gmbh Robert Regulated injection pump
US3446198A (en) * 1967-07-03 1969-05-27 Ford Motor Co Integrated fuel injection and ignition distributor assembly
US3517688A (en) * 1968-10-08 1970-06-30 Scholle Container Corp Aseptic filling valve

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4188144A (en) * 1976-08-20 1980-02-12 Robert Bosch Gmbh Mechanism for holding and guiding a pivoting member
US4224914A (en) * 1977-09-23 1980-09-30 Robert Bosch Gmbh Fuel injection apparatus
US4240391A (en) * 1977-12-19 1980-12-23 Honda Giken Kogyo Kabushiki Kaisha Fuel supply control device for fuel injected internal combustion engine
US4266571A (en) * 1978-03-09 1981-05-12 Audi Nsu Auto Union Aktiengesellschaft Fuel metering valve
US4538577A (en) * 1979-03-22 1985-09-03 Honda Giken Kogyo Kabushiki Kaisha Fuel injection apparatus for internal combustion engine
US8935078B1 (en) * 2012-01-14 2015-01-13 Anthony Richard Lorts Hydraulic servo gas regulator for multi-fuel engine
GB2511594A (en) * 2012-11-12 2014-09-10 Hamilton Sundstrand Corp Low hysteresis fluid metering valve
GB2511594B (en) * 2012-11-12 2018-12-26 Hamilton Sundstrand Corp Low hysteresis fluid metering valve
CN104100414A (zh) * 2013-04-15 2014-10-15 福特环球技术公司 可变压力气体燃料调节器
CN104100414B (zh) * 2013-04-15 2019-04-12 福特环球技术公司 可变压力气体燃料调节器

Also Published As

Publication number Publication date
GB1294919A (de) 1972-11-01
DE1934703A1 (de) 1971-02-18
FR2054292A5 (de) 1971-04-16
DE1934703B2 (de) 1976-11-04
JPS4946005B1 (de) 1974-12-07

Similar Documents

Publication Publication Date Title
US3809036A (en) Fuel injection apparatus
US3983849A (en) Fuel injection system
US3791359A (en) Fuel injection apparatus for externally ignited internal combustion engines operating on continuously injected fuel
US3688754A (en) Fuel injection system for externally ignited internal combustion engines
US3777725A (en) Means for varying the air-fuel ratio in a fuel injection system for internal combustion engines
GB1449856A (en) Fuel injection systems for internal combustion engines
GB1254457A (en) Carburetors for internal combustion engines
JPS6111469Y2 (de)
US3606872A (en) Fuel injection system for externally ignited internal combustion engines
GB1261246A (en) Improvements in or relating to a fuel injection device for a compression-ignited internal combustion engine
US4108117A (en) Fuel metering system
US2948273A (en) Fuel supply system
GB1156796A (en) Improvements in or relating to Fuel Systems for Gas Turbine Engines Operating at Variable Pressure.
US4089308A (en) Carburation devices
US3712275A (en) Fuel injection systems
US3473523A (en) Fuel injection system
GB1364052A (en) Cold starting devices for internal combustion engines
GB1585944A (en) Mixture-compressing internal combustion engines with external ignition and continuous fuel ignition
US2623510A (en) Governor for internal-combustion engines
US3835825A (en) Internal combustion engines
US3919992A (en) Fuel injection system
GB1068729A (en) Improvements in fuel injection pumps for internal combustion engines
US2817325A (en) Control device for internal combustion engines
US3915138A (en) Fuel injection system
US3702603A (en) Internal combustion engines