US3776208A - Fuel injection apparatus for spark plug-ignited internal combustion engines - Google Patents

Fuel injection apparatus for spark plug-ignited internal combustion engines Download PDF

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Publication number
US3776208A
US3776208A US00213101A US3776208DA US3776208A US 3776208 A US3776208 A US 3776208A US 00213101 A US00213101 A US 00213101A US 3776208D A US3776208D A US 3776208DA US 3776208 A US3776208 A US 3776208A
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US
United States
Prior art keywords
channel
air
improvement
throttle member
fuel
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
US00213101A
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English (en)
Inventor
G Stumpp
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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
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Publication of US3776208A publication Critical patent/US3776208A/en
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    • 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
    • F02D41/187—Circuit arrangements for generating control signals by measuring intake air flow using a hot wire flow sensor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/74—Valve actuation; electrical

Definitions

  • the angular position of the throttle memher is variable by an electric follower regulator circuit that includes, in a bridge circuit, a temperature-dependent resistance which is disposed in a channel bypassing the throttle member and which changes its resistance as a function of the velocity and density of the intake air passing through said channel.
  • This invention relates to a fuel injection apparatus for an externally ignited internal combustion engine having an air intake tube in which there are serially arranged anarbitrarily operable butterfly valve and an additional throttle member.
  • the sensing of the air flow in the suction tube for the purpose of metering a fuel quantity which is proportionate to the air quantities is effected I in a channel bypassing the aforenoted additional throttle member.
  • a change in the sensed effects a change in the metered fuel quantities.
  • the throttle member as the air flow varies in the bypass channel (in response to the change in the rpm and the position of the butterfly valve) is displaced with the aid of a follower regulator circuit in such a manner that in the bypass channel there is maintained a predetermined and constant measuring value. Further, the position of the throttle member is a measure for the fuel quantity metering.
  • FIG. 1 in an air intake tube 1 of an internal combustion engine (not shown), there are serially arranged an arbitrarily operable butterfly valve 2 and a throttle member 3. The latter is bypassed by a bypass channel 4, in the narrowest cross section 5 of which there is disposed at temperature-dependent resistance 6.
  • the conductance of the resistance 6 varies in a known manner as a function of the velocity and density of the air stream passing therethrough. According to the invention, a variation of the conductance is utilized to vary the position of the throttle 3 with the aid of a follower regulator circuit to be described hereinafter. Thus, as soon as the velocity and/or the density 6 also changes.
  • the throttle member 3 is moved until the product of air velocity and air density in the bypass 4 attains its earlier magnitude (i.e., prior to the change in conductance).
  • the aforenoted product of air velocity and air density in the bypass remains constant, so that the position of the throttle member 3 is a measure for the flow rate of air in the suction tube 1.
  • the throttle member 3 upon its displacement, changes the position of a cam track formed of a three-dimensional cam 8 which directly affects the fuel quantity control member (fuel rack) 9 of a fuel metering valve 10. Further, the three-dimensional cam 8 may be axially displaced by means, not shown, as a function of the pressure in the air intake tube or as a function of the position of the butterfly valve 2 or as a function of other operational magnitudes of the internal combustion engine.
  • the rotation of the throttle member 3 is effected by a setting motor 12 which obtains command signals from a regulator 13 which, in turn, is formed as the diagonal component of a bridge circuit 14.
  • the regulator 13 is of known structure and may have, for example, a circuit diagram as shown in the Amplifier Handbook by RF. Shea, pages 26-46 (FIG. 81) or pages 31-42 (FIG.6l
  • the bridge circuit 14 is supplied with signals by the temperature-dependent resistance 6 constituting a component of the circuit 14. Further signal transmitters 15 and 16 serve, in the first place, for the balancing of the bridge circuit 14 and, in the second place, for the application of other signals representing engine or environmental variables. Further, the bridge circuit 14 includes a compensating resistance 17 which senses the temperature of the intake air.
  • the voltage supply necessary for the operation of the aforedescribed apparatus may be the stabilized DC voltage of a vehicle battery 18.
  • the aforedescribed simple fuel injection apparatus may be used for effecting a continuous injection (injection of a fuel quantity per unit time) or for effecting a timed injection (injection of a fuel quantity per stroke).
  • the above-described fuel injection apparatus has several significant advantages. Its spatial requirements are small and so are the flow losses caused thereby. Further, effecting an input of correcting magnitude is simple, particularly because of the fact that the temper ature-dependent resistance 6 also responds to the air density. Also, the throttle member 3 may be set without having to consider frictional losses inherent in mechanical regulator members.
  • the apparatus according to the invention ensures the sensing of the flow rate independently from the air pressure and "the air temperature.
  • the use of the bridge circuit 14 eliminates the necessity to assign a constant amplification factor to the regulator 13.
  • a fuel injection apparatus associated with an internal combustion engine having an air intake tube and an arbitrarily movable butterfly valve disposed therein, said apparatus being of the type that includes (a) a channel in communication with said air intake tube and bypassing a portion thereof, (b) means disposed in said channel for sensing the flow of air therein and (c) means for varying the injected fuel quantities in response to a change in the sensed value in said channel for metering fuel quantities in proportion to the air quantities flowing through said air intake tube, the improvement comprising A. a throttle member disposed in a portion of said air intake tube and spaced from said butterfly valve, said channel bypassing said throttle member and B.
  • a follower regulator circuit operatively connected between said means disposed in said channel for sensing the flow of air therein and said throttle member for displacing said throttle member so as to maintain a substantially constant sensed value in said channel, said means disposed in said channel being responsive to velocity and density of air passing through said channel, the position of said throttle member being a measure for metering of fuel.
  • said means disposed in said channel being formed of a temperature-dependent resistance for maintaining the product of air velocity and air density constant in said channel.
  • cam track being formed as a three-dimensional cam, said improvement including additional means for displacing said three-dimensional cam in response to an engine variable.
  • said follower regulator circuit being formed as an electric regulator circuit
  • said means disposed in said channel being formed of a temperature-dependent resistance, the conductance of which being varied in response to the product of air velocity and air density in said channel, said improvement further including means for applying electric signals from said resistance to said electric regulator circuit, said electric signals varying in response to changes in said conductance.
  • said electric regulator circuit being formed as a bridge circuit, said temperature-dependent resistance constituting a branch of said bridge circuit, the improvement further including a regulator forming the diagonal branch of said bridge circuit.
  • a method of injecting fuel in an internal combustion engine of the type having an air intake tube and an arbitrarily movable butterfly valve disposed therein said method including the known steps of (a) measuring the flow of intake air in said tube by sensing the air flow in a channel bypassing a portion of said air intake tube and (b) varying the metered fuel quantities in response to the variation of the value sensed in said channel, the improvement comprising the steps of A. varying the flow passage section of said portion of said air intake tube in response to a change of the air flow in said channel so as to maintain in the latter a predetermined constant measured value and B. varying the metered fuel quantities in response to the variation of the flow passage section of said portion,
  • measuring step involves sensing velocity and density of air passing through said channel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Fuel-Injection Apparatus (AREA)
US00213101A 1970-12-28 1971-12-28 Fuel injection apparatus for spark plug-ignited internal combustion engines Expired - Lifetime US3776208A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702063963 DE2063963A1 (de) 1970-12-28 1970-12-28 Kraftstoffeinspritzanlage für gemischverdichtende, fremdgezündete Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3776208A true US3776208A (en) 1973-12-04

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ID=5792283

Family Applications (1)

Application Number Title Priority Date Filing Date
US00213101A Expired - Lifetime US3776208A (en) 1970-12-28 1971-12-28 Fuel injection apparatus for spark plug-ignited internal combustion engines

Country Status (10)

Country Link
US (1) US3776208A (de)
AT (1) AT311726B (de)
CS (1) CS154334B2 (de)
DE (1) DE2063963A1 (de)
ES (1) ES398363A1 (de)
FR (1) FR2120801A5 (de)
GB (1) GB1318497A (de)
IT (1) IT944390B (de)
PL (1) PL81717B1 (de)
SE (1) SE375584B (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899552A (en) * 1974-03-01 1975-08-12 Universal Oil Prod Co Carburetor with automatic air-fuel ratio adjustment control
US3946705A (en) * 1974-09-30 1976-03-30 The United States Of America As Represented By The Secretary Of The Army Heat engine power system
US3970065A (en) * 1973-06-29 1976-07-20 Diesel Kiki Co., Ltd. Fuel injection pump control system
US4066961A (en) * 1975-02-05 1978-01-03 Smiths Industries Limited Speed sensing
DE2914275A1 (de) 1978-04-10 1979-10-18 Hitachi Ltd Luftdurchsatz-messvorrichtung
EP0016843A1 (de) * 1978-07-21 1980-10-15 Hitachi, Ltd. Brennstoffeinspritzverfahren für Brennkraftmaschine
US4286562A (en) * 1979-03-07 1981-09-01 General Motors Corporation Engine charge forming apparatus
US4300506A (en) * 1978-08-18 1981-11-17 Robert Bosch Gmbh Fuel supply system
DE3200507A1 (de) * 1981-01-13 1982-07-22 Hitachi, Ltd., Tokyo Lufteinlassmessvorrichtung fuer eine brennkraftmaschine
US4417558A (en) * 1981-03-25 1983-11-29 Hitachi, Ltd. Fuel feeding apparatus for internal combustion engine
US4442818A (en) * 1980-12-29 1984-04-17 Hitachi, Ltd. Fuel injection apparatus for internal combustion engines
US4448172A (en) * 1981-05-22 1984-05-15 Hitachi, Ltd. Fuel injection apparatus
US4472323A (en) * 1982-08-10 1984-09-18 Automotive Engine Associates Metering system
US4546748A (en) * 1982-07-02 1985-10-15 Hitachi, Ltd. Fuel injection system
US5505073A (en) * 1993-07-22 1996-04-09 Siemens Aktiengesellschaft Sensor having a sensor element arranged in a housing

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3128710A1 (de) * 1981-07-21 1983-02-10 Dieter 8242 Bischofswiesen Frank Verfahren und geraet zum messen des brennstoffbedarfs einer brennkraftmaschine
JPS5896163A (ja) * 1981-12-02 1983-06-08 Hitachi Ltd 燃料制御装置
JP2552320B2 (ja) * 1988-02-25 1996-11-13 株式会社ユニシアジェックス 内燃機関の熱線式空気流量検出装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2791995A (en) * 1954-02-15 1957-05-14 Gen Motors Corp Anti-detonation device for a carburetor
US2856910A (en) * 1956-04-23 1958-10-21 Acf Ind Inc Fuel injection system
US2899951A (en) * 1959-08-18 Fuel cut-off device for fuel injection system
US2943614A (en) * 1957-05-02 1960-07-05 Bosch Robert Fuel injection arrangement
US3621825A (en) * 1970-07-27 1971-11-23 Ford Motor Co Exhaust gas recirculation control valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899951A (en) * 1959-08-18 Fuel cut-off device for fuel injection system
US2791995A (en) * 1954-02-15 1957-05-14 Gen Motors Corp Anti-detonation device for a carburetor
US2856910A (en) * 1956-04-23 1958-10-21 Acf Ind Inc Fuel injection system
US2943614A (en) * 1957-05-02 1960-07-05 Bosch Robert Fuel injection arrangement
US3621825A (en) * 1970-07-27 1971-11-23 Ford Motor Co Exhaust gas recirculation control valve

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970065A (en) * 1973-06-29 1976-07-20 Diesel Kiki Co., Ltd. Fuel injection pump control system
US3899552A (en) * 1974-03-01 1975-08-12 Universal Oil Prod Co Carburetor with automatic air-fuel ratio adjustment control
US3946705A (en) * 1974-09-30 1976-03-30 The United States Of America As Represented By The Secretary Of The Army Heat engine power system
US4066961A (en) * 1975-02-05 1978-01-03 Smiths Industries Limited Speed sensing
US4517837A (en) * 1978-04-10 1985-05-21 Hitachi, Ltd. Air flow rate measuring apparatus
DE2914275A1 (de) 1978-04-10 1979-10-18 Hitachi Ltd Luftdurchsatz-messvorrichtung
DE2954202C2 (de) * 1978-04-10 1987-09-03 Hitachi, Ltd., Tokio/Tokyo, Jp
EP0016843A1 (de) * 1978-07-21 1980-10-15 Hitachi, Ltd. Brennstoffeinspritzverfahren für Brennkraftmaschine
EP0016843A4 (de) * 1978-07-21 1981-09-01 Hitachi Ltd Brennstoffeinspritzverfahren für Brennkraftmaschine.
US4300506A (en) * 1978-08-18 1981-11-17 Robert Bosch Gmbh Fuel supply system
US4286562A (en) * 1979-03-07 1981-09-01 General Motors Corporation Engine charge forming apparatus
US4442818A (en) * 1980-12-29 1984-04-17 Hitachi, Ltd. Fuel injection apparatus for internal combustion engines
US4420972A (en) * 1981-01-13 1983-12-20 Hitachi, Ltd. Air intake measuring apparatus for internal combustion engine
DE3200507A1 (de) * 1981-01-13 1982-07-22 Hitachi, Ltd., Tokyo Lufteinlassmessvorrichtung fuer eine brennkraftmaschine
US4417558A (en) * 1981-03-25 1983-11-29 Hitachi, Ltd. Fuel feeding apparatus for internal combustion engine
US4448172A (en) * 1981-05-22 1984-05-15 Hitachi, Ltd. Fuel injection apparatus
US4546748A (en) * 1982-07-02 1985-10-15 Hitachi, Ltd. Fuel injection system
US4472323A (en) * 1982-08-10 1984-09-18 Automotive Engine Associates Metering system
US5505073A (en) * 1993-07-22 1996-04-09 Siemens Aktiengesellschaft Sensor having a sensor element arranged in a housing

Also Published As

Publication number Publication date
CS154334B2 (de) 1974-03-29
SE375584B (de) 1975-04-21
AT311726B (de) 1973-11-26
FR2120801A5 (de) 1972-08-18
IT944390B (it) 1973-04-20
PL81717B1 (de) 1975-08-30
DE2063963A1 (de) 1972-07-20
ES398363A1 (es) 1974-10-01
GB1318497A (en) 1973-05-31
SU440000A3 (ru) 1974-08-15

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