US3704702A - Start-up fuel injection system - Google Patents

Start-up fuel injection system Download PDF

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Publication number
US3704702A
US3704702A US81873A US3704702DA US3704702A US 3704702 A US3704702 A US 3704702A US 81873 A US81873 A US 81873A US 3704702D A US3704702D A US 3704702DA US 3704702 A US3704702 A US 3704702A
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US
United States
Prior art keywords
fuel injection
solenoid coil
thyristor
resistor
injection system
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
US81873A
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English (en)
Inventor
Shigeo Aono
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.)
Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Application granted granted Critical
Publication of US3704702A publication Critical patent/US3704702A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M71/00—Combinations of carburettors and low-pressure fuel-injection apparatus
    • F02M71/04—Combinations of carburettors and low-pressure fuel-injection apparatus with carburettor being used at starting or idling only and injection apparatus being used during normal operation of engine or vice versa
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/001—Arrangements thereof

Definitions

  • a solenoid valve [58] Field of Search ..l23ll19 R, 179 G, 187.5 R, controlled injector system.
  • the solenoid valve is ener- 123/180 T gized in dependence on a signal produced by a combination of actions of a thyristor and a thermistor or a combination of similar basic elements.
  • a conventional start-up fuel injection system employs a fuel injection nozzle capable of supplying fuel in a highly atomized form, which nozzle is energized by means comprising relays or transistor circuit.
  • relays or transistor circuit.
  • a controlled rectifier such as, of a thyristor for closing and opening the circuit through a solenoid valve mounted in a nozzle.
  • FIG. 1 is a schematic circuit diagram of a starting fuel injection system according to one embodiment of this invention.
  • FIG. 2 schematically shows the operation of a thyristor used as a switch in the start-up fuel injection system of FIG. 1;
  • FIG. 3 schematically shows the relationship between the operation of the present start-up fuel injection system and the engine temperature.
  • reference numeral designates a starting fuel injection nozzle which is adapted to supply fuel in a highly atomized form to the intake air to be delivered to an engine cylinder 11.
  • the nozzle 10 is mounted on an intake manifold 12 just downstream of a throttle valve 13 mounted therein. While the nozzle 10 is shown as located in the intake manifold it is to be understood that the nozzle 10 could equally well be located to supply atomized full directly into the cylinder of the engine downstream of the intake valve.
  • the nozzle 10 is opened and closed by a solenoid valve 14 which is energized by a control unit.
  • the control unit includes a thermistor 15 having a high temperature coefficient of resistance which is mounted on a cylinder block 16 of the engine so as to sense the engine temperature.
  • the thermistor 15 has two terminals, one of which is grounded.
  • the other terminal of the thermistor 15 is connected via a resistor 17 to the gate of a controlled rectifier, such as of a thyristor 18, the cathode thereof being grounded.
  • the thyristor 18 has its anode grounded by way of a resistor 19 and a capacitor 20 which are connected in series to each other.
  • the anode of the thyristor 18 is also connected to the coil 21 of the solenoid valve 14 which coil has a diode 22 connected thereacross.
  • the solenoid coil 21 is connected via a resistor 23 and a starting switch 24 to a battery 25.
  • a resistor 27 Connected at a junction 26 between the resistor 23 and the starting switch 24 is a resistor 27 having one end connected to the
  • the potential at a point 28 between the resistor 27 and the thermistor 15 becomes to a level which is dependent upon the varying resistances of the thermistor 15.
  • the potential at the point 28 is imposed on the gate of the thyristor 18 via the resistor 17.
  • the resistance values of the resistors 17 and 27 and the thermistor 15 are adjusted so that when the engine temperature sensed by the thermistor 15 is below a predetermined value, such as, for example 20C, the potential at the point 28 is sufficiently high to turn on the thyristor 18.
  • the thermistor 15 represents so high a resistance that the potential at the point 28. is increased to render the thyristor l8 conductive.
  • Conduction of the thyristor 18 makes the circuit through the solenoid coil 21 and the resistor 23 to energize the solenoid valve 14 during the duration of the starting switch 24 being closed.
  • the fuel nozzle 10 is operative to supply atomized fuel to the intake manifold 12 so as to enrich the air-fuel mixture, thereby facilitating to start the engine.
  • the starting switch 24 is opened to de-energize the control unit and the solenoid valve 14 in this sequence so that the fuel nozzle 10 ceases to inject fuel into the intake manifold 12.
  • FIG. 2 schematically shows the behaviors of the thyristor 18 in terms of the voltage imposed on the gate electrode.
  • the solenoid valve 14 which is kept open while the anode current flows therethrough operates to actuate the fuel nozzle 10 with increased reliability.
  • this type of fuel injection system there occurs no chattering which is an inherent drawback in the systems employing relays.
  • FIG. 3 schematically shows the relationship between the operation of the start-up fuel injection system and the engine temperature.
  • this system is adapted to actuate the starting fuel injection valve 14 in the case where the engine temperature is below the predetermined value, such as 20C, while when the temperature is above the predetermined value the injection valve 14 is not actuated. More specifically, when the engine temperature is above the predetermined value, the thermistor 15 has so low a resistance thatthe potential appearing at the point 28 when the starting switch 24 is closed is not sufficiently high to render the thyristor 18 conductive. It is to be noted that the temperature point below which the solenoid valve 14 is actuated upon closure of the starting switch 24 can be varied by adjustment of the resistance values of the resistors 17 and 27 and the thermistor 15.
  • this invention provides a new and improved start-up fuel injection system having a controlled rectifier, such as of a thyristor, and which can inject fuel with increased reliability when the engine temperature is below a predetermined value.
  • a start-up fuel injection system for an internal combustion engine having an engine cylinder, a cylinder block and a fuel injection nozzle adapted to supply fuel in highly atomized form to intake air to be delivered to said engine cylinder when opened, said start-up fuel injection system comprising a battery; a starting switch connected to said battery; a solenoid valve for closing and opening said fuel injection nozzle; a solenoid coil having first and second terminals; said solenoid coil being connected at its first terminal to said battery through said starting switch; a thyristor having an anode connected to said second terminal of said solenoidcoil and a cathode; a first resistor connected at its one end to said cathode of said thyristor; a second resistor having one end connected to the other end of said first resistor and the other end connected to a junction between said first terminal of said solenoid coil and said starting switch, and a thermistor having a high temperature resistance mounted on said cylinder block and connected to a point between said first and
  • a start-up fuel injection nozzle according to claim 1, further comprising a resistor connected between said second terminal of said solenoid coil and said anode of said thyristor, and a capacitor having one terminal connected to said resistor and the other terminai connected to the ground.
  • a start-up fuel injection system according to claim 1, wherein said solenoid coil includes a diode connected across said first and second terminals at said solenoid coil.

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  • 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)
US81873A 1969-10-22 1970-10-19 Start-up fuel injection system Expired - Lifetime US3704702A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44084432A JPS50205B1 (xx) 1969-10-22 1969-10-22

Publications (1)

Publication Number Publication Date
US3704702A true US3704702A (en) 1972-12-05

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ID=13830409

Family Applications (1)

Application Number Title Priority Date Filing Date
US81873A Expired - Lifetime US3704702A (en) 1969-10-22 1970-10-19 Start-up fuel injection system

Country Status (5)

Country Link
US (1) US3704702A (xx)
JP (1) JPS50205B1 (xx)
DE (1) DE2051919C3 (xx)
FR (1) FR2066347A5 (xx)
GB (1) GB1290556A (xx)

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780718A (en) * 1971-10-25 1973-12-25 Nissan Motor Carburetor for an internal combustion engine
US3799138A (en) * 1971-03-23 1974-03-26 Porsche Kg Cold starting installation for internal combustion engines
US3847130A (en) * 1971-08-23 1974-11-12 Nippon Denso Co Electrical fuel injection system for internal combustion engines
US3908611A (en) * 1971-03-31 1975-09-30 Toyo Kogyo Co Cold starting device of a rotary piston internal combustion engine
US3960131A (en) * 1974-11-29 1976-06-01 Jetco, Inc. Internal combustion engine starting system
US3960118A (en) * 1973-05-16 1976-06-01 Toyota Jidosha Kogyo Kabushiki Kaisha Air-fuel ratio adjusting device in an internal combustion engine having a carburetor
US4132210A (en) * 1976-10-01 1979-01-02 Allied Chemical Corporation Fuel injection system with switchable starting mode
US4152121A (en) * 1976-05-26 1979-05-01 Nederlandse Organisatie Voor Toegepast Natuurwetenschappelijk Onderzoek Ten Behoeve Van Nijverheid, Handel En Verkeer Installation for supplying gaseous fuels, such as LPG or natural gas, to a combustion engine
US4157084A (en) * 1977-09-20 1979-06-05 Wallis Marvin E Fuel injection system and method for internal combustion engine
US4164205A (en) * 1976-12-10 1979-08-14 Toyo Kogyo Co., Ltd. Internal combustion engine having a dual induction type intake system
US4216757A (en) * 1977-04-07 1980-08-12 Robert Bosch Gmbh Electrical control circuit, especially for a fuel supply device of an internal combustion engine
US4292964A (en) * 1979-01-19 1981-10-06 Ulrich Max B Method of and apparatus for pinning a fractured pelvis
FR2519086A1 (fr) * 1981-12-29 1983-07-01 Sibe Dispositif d'alimentation de moteur a combustion interne comprenant un carburateur
US4513700A (en) * 1978-05-17 1985-04-30 Yamaha Hatsudoki Kabushiki Kaisha Induction system for spark ignition engine of fuel injection type
US4554896A (en) * 1982-05-01 1985-11-26 Yamaha Hatsudoki Kabushiki Kaisha Fuel control system for internal combustion engines
US4577599A (en) * 1982-09-27 1986-03-25 Brunswick Corporation Remote starter for internal combustion engine
DE3546311A1 (de) * 1984-12-29 1986-07-03 Aisan Kogyo K.K., Obu, Aichi Aufwaermesystem fuer kfz-motoren
GB2180944A (en) * 1985-09-26 1987-04-08 M D Edward Harry Hon Continuous cutaneous blood pressure measurement
US4671225A (en) * 1985-08-01 1987-06-09 Outboard Marine Corporation Timed priming system with temperature override
US4726342A (en) * 1986-06-30 1988-02-23 Kwik Products International Corp. Fuel-air ratio (lambda) correcting apparatus for a rotor-type carburetor for integral combustion engines
US4869850A (en) * 1986-06-30 1989-09-26 Kwik Products International Corporation Rotor-type carburetor apparatus and associated methods
US4960545A (en) * 1988-09-30 1990-10-02 Marco Morini Device for feeding a carburation engine in special operating conditions
US5007390A (en) * 1988-02-12 1991-04-16 Sanshin Kogyo Kabushiki Kaisha Starting fuel supplying device for internal combustion engine
US5048477A (en) * 1987-07-06 1991-09-17 Komatsu Zenoah Kabushiki Kaisha Fuel supply system for an engine
USRE33929E (en) * 1982-05-28 1992-05-19 Kwik Products International Corporation Central injection device for internal combustion engines
DE4036376A1 (de) * 1990-11-15 1992-05-21 Kloeckner Humboldt Deutz Ag Temperaturabhaengige startmehrmengen-steuerung
US5158051A (en) * 1987-07-06 1992-10-27 Komatsu Zenoah Kabushiki Kaisha Fuel supply system for engine
US5190001A (en) * 1990-08-22 1993-03-02 Volkswagen Ag Fuel supply system for an engine operating an alcohol-containing fuel
US20070012286A1 (en) * 2005-07-13 2007-01-18 Visteon Global Technologies, Inc. Idle air control valve stepper motor initialization technique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2429902A1 (fr) * 1978-04-27 1980-01-25 Lenz Hans Dispositif de formation du melange pour moteurs a combustion interne
DE3003722A1 (de) * 1979-02-05 1980-08-14 Elmwood Sensors Elektrische schaltung mit einer temperaturabhaengigen schaltverzoegerung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3456628A (en) * 1966-04-13 1969-07-22 Sopromi Soc Proc Modern Inject High-speed fuel injection system
US3490425A (en) * 1966-09-30 1970-01-20 Sopromi Soc Proc Modern Inject System for pressurizing and relieving liquids in conduits
US3533381A (en) * 1968-05-24 1970-10-13 Bosch Gmbh Robert Temperature sensitive control circuit for internal combustion engines having a fuel injection system
US3587553A (en) * 1969-07-24 1971-06-28 Bendix Corp Carburetor priming system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3456628A (en) * 1966-04-13 1969-07-22 Sopromi Soc Proc Modern Inject High-speed fuel injection system
US3490425A (en) * 1966-09-30 1970-01-20 Sopromi Soc Proc Modern Inject System for pressurizing and relieving liquids in conduits
US3533381A (en) * 1968-05-24 1970-10-13 Bosch Gmbh Robert Temperature sensitive control circuit for internal combustion engines having a fuel injection system
US3587553A (en) * 1969-07-24 1971-06-28 Bendix Corp Carburetor priming system

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799138A (en) * 1971-03-23 1974-03-26 Porsche Kg Cold starting installation for internal combustion engines
US3908611A (en) * 1971-03-31 1975-09-30 Toyo Kogyo Co Cold starting device of a rotary piston internal combustion engine
US3847130A (en) * 1971-08-23 1974-11-12 Nippon Denso Co Electrical fuel injection system for internal combustion engines
US3780718A (en) * 1971-10-25 1973-12-25 Nissan Motor Carburetor for an internal combustion engine
US3960118A (en) * 1973-05-16 1976-06-01 Toyota Jidosha Kogyo Kabushiki Kaisha Air-fuel ratio adjusting device in an internal combustion engine having a carburetor
US3960131A (en) * 1974-11-29 1976-06-01 Jetco, Inc. Internal combustion engine starting system
US4152121A (en) * 1976-05-26 1979-05-01 Nederlandse Organisatie Voor Toegepast Natuurwetenschappelijk Onderzoek Ten Behoeve Van Nijverheid, Handel En Verkeer Installation for supplying gaseous fuels, such as LPG or natural gas, to a combustion engine
US4132210A (en) * 1976-10-01 1979-01-02 Allied Chemical Corporation Fuel injection system with switchable starting mode
US4164205A (en) * 1976-12-10 1979-08-14 Toyo Kogyo Co., Ltd. Internal combustion engine having a dual induction type intake system
US4216757A (en) * 1977-04-07 1980-08-12 Robert Bosch Gmbh Electrical control circuit, especially for a fuel supply device of an internal combustion engine
US4157084A (en) * 1977-09-20 1979-06-05 Wallis Marvin E Fuel injection system and method for internal combustion engine
US4513700A (en) * 1978-05-17 1985-04-30 Yamaha Hatsudoki Kabushiki Kaisha Induction system for spark ignition engine of fuel injection type
US4292964A (en) * 1979-01-19 1981-10-06 Ulrich Max B Method of and apparatus for pinning a fractured pelvis
FR2519086A1 (fr) * 1981-12-29 1983-07-01 Sibe Dispositif d'alimentation de moteur a combustion interne comprenant un carburateur
US4554896A (en) * 1982-05-01 1985-11-26 Yamaha Hatsudoki Kabushiki Kaisha Fuel control system for internal combustion engines
USRE33929E (en) * 1982-05-28 1992-05-19 Kwik Products International Corporation Central injection device for internal combustion engines
US4577599A (en) * 1982-09-27 1986-03-25 Brunswick Corporation Remote starter for internal combustion engine
DE3546311A1 (de) * 1984-12-29 1986-07-03 Aisan Kogyo K.K., Obu, Aichi Aufwaermesystem fuer kfz-motoren
US4644919A (en) * 1984-12-29 1987-02-24 Aisan Kogyo Kabushiki Kaisha Warming-up system of a car engine
US4671225A (en) * 1985-08-01 1987-06-09 Outboard Marine Corporation Timed priming system with temperature override
GB2180944A (en) * 1985-09-26 1987-04-08 M D Edward Harry Hon Continuous cutaneous blood pressure measurement
US4726342A (en) * 1986-06-30 1988-02-23 Kwik Products International Corp. Fuel-air ratio (lambda) correcting apparatus for a rotor-type carburetor for integral combustion engines
US4869850A (en) * 1986-06-30 1989-09-26 Kwik Products International Corporation Rotor-type carburetor apparatus and associated methods
US5158051A (en) * 1987-07-06 1992-10-27 Komatsu Zenoah Kabushiki Kaisha Fuel supply system for engine
US5048477A (en) * 1987-07-06 1991-09-17 Komatsu Zenoah Kabushiki Kaisha Fuel supply system for an engine
US5007390A (en) * 1988-02-12 1991-04-16 Sanshin Kogyo Kabushiki Kaisha Starting fuel supplying device for internal combustion engine
US4960545A (en) * 1988-09-30 1990-10-02 Marco Morini Device for feeding a carburation engine in special operating conditions
US5190001A (en) * 1990-08-22 1993-03-02 Volkswagen Ag Fuel supply system for an engine operating an alcohol-containing fuel
DE4036376A1 (de) * 1990-11-15 1992-05-21 Kloeckner Humboldt Deutz Ag Temperaturabhaengige startmehrmengen-steuerung
US20070012286A1 (en) * 2005-07-13 2007-01-18 Visteon Global Technologies, Inc. Idle air control valve stepper motor initialization technique
US7191755B2 (en) 2005-07-13 2007-03-20 Visteon Global Technologies, Inc. Idle air control valve stepper motor initialization technique

Also Published As

Publication number Publication date
GB1290556A (xx) 1972-09-27
JPS50205B1 (xx) 1975-01-07
FR2066347A5 (xx) 1971-08-06
DE2051919C3 (de) 1974-11-07
DE2051919A1 (de) 1971-04-29
DE2051919B2 (de) 1974-03-21

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