US3626912A - Device for regulating the supply of carburant to an internal combustion engine - Google Patents

Device for regulating the supply of carburant to an internal combustion engine Download PDF

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Publication number
US3626912A
US3626912A US18640A US3626912DA US3626912A US 3626912 A US3626912 A US 3626912A US 18640 A US18640 A US 18640A US 3626912D A US3626912D A US 3626912DA US 3626912 A US3626912 A US 3626912A
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United States
Prior art keywords
transistor
idling
circuit
engine
base
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Expired - Lifetime
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US18640A
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English (en)
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Fernand Grosclaude
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Individual
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Individual
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    • 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
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • 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
    • F02M3/00—Idling devices for carburettors
    • F02M3/02—Preventing flow of idling fuel
    • F02M3/04—Preventing flow of idling fuel under conditions where engine is driven instead of driving, e.g. driven by vehicle running down hill
    • F02M3/045—Control of valves situated in the idling nozzle system, or the passage system, by electrical means or by a combination of electrical means with fluidic or mechanical means
    • 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

  • Lobato ABSTRACT An internal combustion engine is fitted with an electromagnetically operated slow running jet and switch means operated by the accelerator pedal controlling means for interrupting the feed from the slow running jet during deceleration and idle running.
  • a transistorized circuit reestablishes the supply from the slow running jet when the engine drops below a given speed according to the frequency *of impulses supplied to the circuit, this frequency depending upon the engine speed.
  • a device which employs an electromagnetic jet controlled by a switch operated by the accelerator pedal, the supply being interrupted when the pedal is released and reestablished when the engine drops below idling speed by a drop in voltage of the dynamo connected to the exciter coil of the jet.
  • the present invention precisely relates to a universal device satisfactorily employable both on vehicles equipped with a dynamo or with an alternator.
  • the invention proposes a device for adjusting the supply of info to an internal combustion engine, comprising an electromagnetic slow-running jet and a switch operated by the accelerator pedal, and means operated by said switch for interrupting the supply from the idle running jet during periods of deceleration and slow-running and independent electronic means for reestablishing the supply when the engine speed drops below a given rate.
  • FIG. I is a schematic diagram of the device.
  • FIG. 2 is a circuit diagram of an electronic switching device.
  • the device comprises an electromagnetic slow-running needle jet 1, closed at rest, and open when its coil is excited.
  • This jet is fed through an electronic circuit 2, a fuse 3 and the switch 4 operated by the ignition key.
  • the circuit 2 works as an electronic switch operated on the one hand by the distributor head 5 which sends alternating current 6 supplied, as for the sparking plugs, by the ignition coil of the engine and, on the other, by a switch consisting of the slow-running adjusting screw 7 having a contact 8 at one end.
  • Contact 8 is, of course, insulated from the metallic or other support into which is screwed either by an insulated tube enclosing the screw or by making the screw itself from an insulating material. In the rest position shown in the drawing, the terminal 8 is grounded since the arm of the butterfly comes up against the screw 7.
  • the device works as follows: the contact 8 is closed until the driver depresses the accelerator pedal; the contact 8 lifts-off its ground connection and the electromagnetic jet 1 is excited by the circuit 2.
  • the terminal 8 is grounded, and circuit 2 cuts the supply to the slow-running jet. Whilst the speed of the engine is higher than the idling speed, the supply to the jet through the circuit 2 remains cut off.
  • the circuit 2 reopens the circuit between the jet and the contact 8 in such a way that the supply ofoids to the slow-running jet is reconnected. This feed is interrupted as soon as the speed once more becomes higher than the idling speed.
  • the use of the slow-running adjusting screw as a switch allows the installation to be carried out very simply and only requires, in addition to an electromagnetic slow-running jet, a small case to protect a printed circuit with the elements of circuit 2.
  • FIG. 2 An embodiment of the switching circuit is shown in FIG. 2.
  • This circuit comprises 10 transistors T, to T,, 4 Zener diodes, Z, to Z 5 diodes D, to D,,, three condensers C, to C and several resistances marked by rectangular boxes.
  • This circuit can be divided into three distinct parts: a first timing circuit 1, a second timing circuit II, and a switch stage III. This circuit works as described hereafter.
  • the alternating current coming from the vehicles ignition coil is fed to the circuit at b.
  • the impulses of this current are rectified by diode D, and applied to the base of amplifying transistor T,.
  • the condenser C is charged up to a supply voltage limited to 10 volts by the Zener diode Z, and the transistor T conducts.
  • the input of a positive impulse to the base of T abruptly discharges condenser C the base of transistor T becoming more positive than its emitter the potential of which is held at least at 1 volt by the Zener diode 2
  • Transistor T operates in the same way as transistor T namely, it is blocked when a positive voltage appears at its base for the duration of the positive square wave.
  • the condenser C is recharged through the resistance R,, and the transistor T once again conducts at the end of a time interval fixed by the time constant R,,.
  • C If a new square wave arrives at the base of T before the end of this time interval, T does not have the time to operate again and remains blocked.
  • the conduction of T depends on the input impulse frequency, i.e., the speed of the engine.
  • T is blocked, T, as well as T and T, are also blocked and the slowrunning jet 1 is not supplied with current.
  • transistor T has time to periodically become a conductor, deblocking transistors T,,, T-, and T which feed the electromagnet of the jet.
  • transistors T and T,,,, homologous with transistors T, and T are directly operated by the contact 8.
  • This circuit is perfectly stable, all voltages are stabilized, and its work threshold can be adjusted with precision by means of potentiometer R,.
  • a device for regulating the supply of fuel to the internal combustion engine of an automotive vehicle comprising a throttle valve, an arm for operating said throttle valve, an adjusting screw cooperating with said arm to set the setting position of said throttle valve, an idling jet, electromagnetic valve means for closing said idling jet, and electric circuit means controlling said valve means to close said idling jet during deceleration when the engine is exerting a braking action, said circuit means comprising a timing circuit responsive to engine speed to open said idling jet when the engine speed falls below a selected idling value and contacts on said throttle valve arm and idling adjusting screw which are closed when said throttle valve is in idling position, whereby said idling jet is closed when said contacts are closed and the speed of said engine is above said selected idling speed.
  • timing circuit comprises pulse generating means operated in synchronism with said engine, capacitance means, means responsive to said pulse generating means for periodically charging said capacitance means, means for discharging said capacitance means and switching means controlled by said capacitance means and actuated when the rate of pulses generated by said pulse generating means falls below a selected valve.
  • timing circuit comprises pulse generating means operated in synchronism with said engine, a first timing stage having an output and an input connected with said pulse generating means, a second timing stage having an output and an input connected to the output of said first timing stage and a switching stage connected to and controlled by the output of said second timing stage and said contacts on throttle arm and idling adjusting screw.
  • said first timing stage comprises a power supply, a first transistor having a base connected through a diode and a capacitor to said pulse generator, a second transistor having a base connected with the emitter of said first transistor, the base circuit of said second transistor comprising a capacitor connecting said second transistor base with a first side of said power supply and a variable resistor connecting said second transistor base with a second side of said power supply, a zener diode connecting, the emitter of said second transistor with said first side of said power supply, and a third transistor having a base connected with the collector ofsaid second transistor.
  • said second timing stage comprises a fourth transistor having a base connected with the collector of said third transistor, a fifth transistor having a base connected with the collector of said fourth transistor, a capacitor connecting said fifth transistor base with said first side of said power supply, a resistor connecting said base with the second side of said power supply, zener diodes connecting the emitters of said fourth and fifth transistors with said first side of the power supply and a sixth transistor having a base connected with the collector of said fifth transistor.
  • said switching stage comprises a first switching transistor controlled by said second timing stage, a second switching transistor controlled by said contacts and circuit means connecting the outputs of both of said switching transistors to said electromagnetic valve means, said connecting circuit means comprising diodes in the outputs of said switching transistors.

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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)
  • Ignition Installations For Internal Combustion Engines (AREA)
US18640A 1969-03-28 1970-03-11 Device for regulating the supply of carburant to an internal combustion engine Expired - Lifetime US3626912A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH479669A CH505287A (fr) 1969-03-28 1969-03-28 Dispositif pour le réglage de l'alimentation en carburant d'un moteur à combustion interne

Publications (1)

Publication Number Publication Date
US3626912A true US3626912A (en) 1971-12-14

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Application Number Title Priority Date Filing Date
US18640A Expired - Lifetime US3626912A (en) 1969-03-28 1970-03-11 Device for regulating the supply of carburant to an internal combustion engine

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US (1) US3626912A (enExample)
BE (1) BE747018A (enExample)
CH (1) CH505287A (enExample)
DE (1) DE2014369A1 (enExample)
FR (1) FR2030963A5 (enExample)
NL (1) NL7004487A (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809028A (en) * 1971-09-27 1974-05-07 Bendix Corp Fuel cutoff circuit responsive to engine deceleration conditions for use in conjunction with the fuel delivery system for an internal combustion engine
US4312310A (en) * 1978-04-24 1982-01-26 Snamprogetti, S.P.A. Pollution-preventing and driving device for internal combustion engines
GB2207466A (en) * 1987-07-10 1989-02-01 Huan Sung Cheng Solenoid valve control of a carburettor idling system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH620275A5 (en) * 1976-05-07 1980-11-14 Bosch Gmbh Robert Device for more reliable switching of solenoid valves for overrun cut-off in carburettors
DE3004199C2 (de) * 1980-02-06 1984-12-06 Dieter 4924 Barntrup Fialla Vorrichtung zum Absperren der Brennstoffzufuhr im Schiebebetrieb eines Verbrennungsmotors
DE3034127A1 (de) * 1980-09-11 1982-04-15 Robert 3170 Gifhorn Hasenfuß Steuervorrichtung zum sperren und freigeben des kraftstoffes fuer vergasermotore waehrend des schiebebetriebes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153746A (en) * 1961-07-03 1964-10-20 Duane E Atkinson Internal combustion engine overspeed control
US3455260A (en) * 1965-10-25 1969-07-15 Sibe Carburettors for internal combustion engines
US3463130A (en) * 1966-11-03 1969-08-26 Bosch Gmbh Robert Fuel injection control system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153746A (en) * 1961-07-03 1964-10-20 Duane E Atkinson Internal combustion engine overspeed control
US3455260A (en) * 1965-10-25 1969-07-15 Sibe Carburettors for internal combustion engines
US3463130A (en) * 1966-11-03 1969-08-26 Bosch Gmbh Robert Fuel injection control system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809028A (en) * 1971-09-27 1974-05-07 Bendix Corp Fuel cutoff circuit responsive to engine deceleration conditions for use in conjunction with the fuel delivery system for an internal combustion engine
US4312310A (en) * 1978-04-24 1982-01-26 Snamprogetti, S.P.A. Pollution-preventing and driving device for internal combustion engines
GB2207466A (en) * 1987-07-10 1989-02-01 Huan Sung Cheng Solenoid valve control of a carburettor idling system

Also Published As

Publication number Publication date
NL7004487A (enExample) 1970-09-30
FR2030963A5 (enExample) 1970-11-13
DE2014369A1 (de) 1970-10-01
CH505287A (fr) 1971-03-31
BE747018A (fr) 1970-08-17

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