US3710766A - Electronic fuel injection system - Google Patents

Electronic fuel injection system Download PDF

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Publication number
US3710766A
US3710766A US00037094A US3710766DA US3710766A US 3710766 A US3710766 A US 3710766A US 00037094 A US00037094 A US 00037094A US 3710766D A US3710766D A US 3710766DA US 3710766 A US3710766 A US 3710766A
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United States
Prior art keywords
pulse
voltages
ramp
ramp voltage
circuit
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Expired - Lifetime
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US00037094A
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English (en)
Inventor
R Beishir
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Carter Automotive Co Inc
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ACF Industries Inc
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Assigned to CARTER AUTOMOTIVE CORPORATION, INC., 9666 OLIVE BOULEVARD, ST. LOUIS, MISSOURI 63132, A CORP. OF DE. reassignment CARTER AUTOMOTIVE CORPORATION, INC., 9666 OLIVE BOULEVARD, ST. LOUIS, MISSOURI 63132, A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ACF INDUSTRIES, INCORPORATED
Assigned to CARTER AUTOMOTIVE COMPANY, INC. reassignment CARTER AUTOMOTIVE COMPANY, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ACF INDUSTRIES, INCORPORATED
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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
    • F02D41/30—Controlling fuel injection
    • F02D41/32—Controlling fuel injection of the low pressure type

Definitions

  • ABSTRACT An electronic circuit for metering solenoid fuelinjectors for an automobile is controlled entirely by voltages produced by a plurality of electrical sensors of engine operating conditions.
  • a ramp voltage generator is triggered by an engine produced pulse to generate a pair of sawtooth output voltages having equal but opposite slopes determined by the sensor outputs, and at the same time a current pulse for opening the fuel injectors is initiated.
  • ..123/32 EA causesthe ramp voltage generator and the comparator 3.575.146 4/1971 C e ghton e 3/3 A circuit to be reset to their initial conditions. 3,548,792 12/1970 Palmer ..123/32 EA I 3,430,616 3/1969 Glockler ..l23/32 EA 5 Claims, 3 Drawing Figures 17 0 24 n M n n 231:; 11: .22:5? GEN.
  • Prior art electronic fuel injection systems typically include a monostable multi-vibrator as the timing device or circuit for controlling the quantity of fuel discharged by the fuel injection nozzles.
  • a monostable multi-vibrator as the timing device or circuit for controlling the quantity of fuel discharged by the fuel injection nozzles.
  • the monostable multi-vibrator relies upon a RC circuit or a LC circuit for controlling the time duration of the excursion to the unstable side.
  • the duration of the excursion is not always as precise as may be desired.
  • the inputto the system namely the trigger
  • spurious trigger signals that originate from sources outside the system such as the ignition system of the vehicle or even the ignition system of the vehicle nearby on the roadway. Whenever a spurious signal is of sufficie'nt amplitude to trigger the system, there is a resultant unnecessary discharge of fuel into the intake manifold of the engine.
  • an object of the invention to provide an electronic fuel injection system which does not rely upon a monostable multi-vibrator and instead utilizes an entirely different timing concept. It is a further object of the invention to provide an electronic fuel injection system which utilizes an on-off circuit which is turned on by a trigger signal and which is turned off by a timing circuit which is separate from the on-off circuit.
  • a further object of the invention is to provide a sample hold circuit which turns on with the initiation of a trigger pulse and which also initiates a ramp voltage generator circuit to produce a ramp voltage and the resultant ramp voltage is then passed to a comparator circuit for the creation of a pulse which turns off the sample hold circuit.
  • a further object of the invention is to sense engine variables which are representative of the engine fuel requirements and to utilize this information to control the operation of the ramp voltage generator so that the ramp voltage generated will be a precise measure of the quantity of fuel delivered to the engine.
  • FIG. 1 is a block diagram of the circuit for the electronic fuel in jection system of this invention.
  • FIG. 2 is the electronic schematic diagram of the upper one half of the electronics of FIG. 1.
  • FIG. 3 is a electronic schematic diagram of the lower one halfof the electronics of FIG. I joined to FIG. 2 at terminals X-X and Y-Y.
  • paratus for sensing the engine operating conditions supplies the resulting D.C. voltages to ramp voltage generator 12, which produces linear sawtooth waves or ramp voltages having a slop, or rate of change, determined by the engine fuel demand voltages.
  • the ramp voltages are impressed on comparator circuit 14 to produce a sharp reset pulse 15 when the ramp voltages reach a predetermined level, established by a biasing voltage on comparator circuit 14 derived from a +9 volt source.
  • a starting pulse 17 derived from the ignition circuit or engine-driven switching means 16 is fed to differentiating circuit 18, and the resulting sharp pulse 20 is fed to a sample-hold circuit 22; The latter produces a step voltage which is terminated by output pulse 15 of the comparator 14.
  • sample hold circuit 22 produces pulses 24 in synchronism with the engine and of a duration inaccordance with engine fuel demand. Pulses 24 are fed through power amplifier 26 to fuel injectors 28 to hold the injectors open fora desired time during each engine cycle. Injectors 28 are opened at time t, determined bythe starting pulse I'Iand closed at a time determined by the enginefuel demand information. The output of amplifier 26 is fed .to ramp voltage generator 12 via line 30.
  • FIGS. 2 and 3 are diagrams of a circuit correspond- I ing to the block diagram of FIG. I.
  • a differential amplifier having a pair of field effect transistors-31, 32 is con nected by output circuit 34 to a plus nine volt source at terminal 36.
  • Transistors 31 and 32 have a number of positive voltage inputs 3840 and an additional number of positive voltage inputs 42-44 from sensors responsive to various engine operating and fuel demand conditions.
  • Transistors 31 and 32 are connected to ground I ferential output amplifier. Its dual output produces linear ramp voltages of the form indicated by wave forms 56, 57.
  • comparator circuit 14 produces output pulses l5.
  • Comparator 14 is a high gain differential input amplifier. Pulse 15 occurs a predetermined time after a trigger signal (described hereinafter) occurs and this timecontrols the time duration that the solenoid injector valves are open. Since the timing of pulse 15 depends on the slopes of voltages 56 and 57, which in turn depend on the output of transistors 31 and 32 in response to the fuel demand voltages on terminals 38 to 44, the solenoid valves remain openfor an interval determined by the voltages on terminals 38 to 44.
  • Triggering pulses 17, derived from the ignition circuit or otherwise, are impressed on terminal 74 of differentiating circuit 18 to produce differentiated pulse across inductance 80.
  • Pulse 20 is applied to the base of transistor 82, making it conductive and thus charging capacitor 84, which holds the charge until pulse 15 is applied to the base of transistor 86, causing it to conduct and discharge capacitor 84.
  • the resultant rectangular positive pulse applied to terminal 88 makes field effect transistor 90 conductive, causing a positive pulse developed across resistor 92 to be applied to the base of transistor 94. The latter is coupled to transistors 96 and 98.
  • Transistor .98 is a power amplifier serving to energize the solenoids 104 of the solenoid fuel injectors, all of which may be connected in parallel.
  • a positive voltage pulse is developed across resistor 100 and fed over line 102 to the base of transistor 60 to cut it off and thereby unclamp terminal 52, as described above.
  • An electronic circuit for an automobile fuel injection system comprising a ramp voltage electronic generator for producing a pair of oppositely' and uniformly varying ramp voltages, means for varying the rate of change of said ramp'voltages in accordancewith engine fuel demand, means for producing starting pulses in accordance with engine speed, means for causing 2.
  • Apparatus according to claiml including means for resetting said ramp voltage generatorin response to the comparator output pulse.
  • means for varying the rate of change of said ramp voltage includes a differential amplifier for-impressing a pair of differential output voltages on said ramp voltage generator, and means for impressing on the inputs of said differential amplifier a plurality of voltages.
  • Apparatus according to claim 4 including means for stabilizing said differential amplifier against temperature changes.

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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)
US00037094A 1970-05-14 1970-05-14 Electronic fuel injection system Expired - Lifetime US3710766A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3709470A 1970-05-14 1970-05-14

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US3710766A true US3710766A (en) 1973-01-16

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US (1) US3710766A (de)
AR (1) AR197948A1 (de)
BR (1) BR7100274D0 (de)
CA (1) CA932052A (de)
DE (1) DE2123589A1 (de)
FR (1) FR2088555B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800749A (en) * 1970-08-14 1974-04-02 Sofredi Apparatus for regulating the duration of a square-wave signal in an electronic injection control installation for diesel engines
US3839997A (en) * 1971-07-21 1974-10-08 Sibe Fuel feed devices for internal combustion engines
US3987764A (en) * 1974-10-25 1976-10-26 International Harvester Company Timer means for sequential fuel injection
US4111171A (en) * 1975-05-12 1978-09-05 Nissan Motor Company, Limited Closed-loop mixture control system for an internal combustion engine using sample-and-hold circuits
US4166439A (en) * 1977-10-21 1979-09-04 Hanan Golan Modified engine controlling system
US4205639A (en) * 1977-06-25 1980-06-03 Diesel Kiki Co., Ltd. Anti-stall device in a diesel engine

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2644094A (en) * 1949-04-27 1953-06-30 Kellogg M W Co Pulse generator
US3314407A (en) * 1964-09-28 1967-04-18 Holley Carburetor Co Electronic advance for engine ignition systems
US3338221A (en) * 1964-01-11 1967-08-29 Bosch Gmbh Robert Electrical control device
US3430616A (en) * 1966-11-11 1969-03-04 Bosch Gmbh Robert Fuel injection control system
US3456628A (en) * 1966-04-13 1969-07-22 Sopromi Soc Proc Modern Inject High-speed fuel injection system
US3464396A (en) * 1966-08-31 1969-09-02 Bosch Gmbh Robert Impulse generator
DE2008350A1 (de) * 1966-04-13 1970-10-15 Sopromi Soc Proc Modern Inject Brennstoffeinspritzsystem für Brennkraftmaschinen mit direkter oede indirekter Einspritzung
US3548792A (en) * 1969-02-11 1970-12-22 Judson G Palmer Control apparatus for internal-combustion engines
US3575146A (en) * 1969-02-06 1971-04-20 Physics Int Co Fuel injection system for an internal combustion engine
US3612009A (en) * 1968-08-28 1971-10-12 Toyota Motor Co Ltd Fuel injection synchronizing system

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2644094A (en) * 1949-04-27 1953-06-30 Kellogg M W Co Pulse generator
US3338221A (en) * 1964-01-11 1967-08-29 Bosch Gmbh Robert Electrical control device
US3314407A (en) * 1964-09-28 1967-04-18 Holley Carburetor Co Electronic advance for engine ignition systems
US3456628A (en) * 1966-04-13 1969-07-22 Sopromi Soc Proc Modern Inject High-speed fuel injection system
DE2008350A1 (de) * 1966-04-13 1970-10-15 Sopromi Soc Proc Modern Inject Brennstoffeinspritzsystem für Brennkraftmaschinen mit direkter oede indirekter Einspritzung
US3464396A (en) * 1966-08-31 1969-09-02 Bosch Gmbh Robert Impulse generator
US3430616A (en) * 1966-11-11 1969-03-04 Bosch Gmbh Robert Fuel injection control system
US3612009A (en) * 1968-08-28 1971-10-12 Toyota Motor Co Ltd Fuel injection synchronizing system
US3575146A (en) * 1969-02-06 1971-04-20 Physics Int Co Fuel injection system for an internal combustion engine
US3548792A (en) * 1969-02-11 1970-12-22 Judson G Palmer Control apparatus for internal-combustion engines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800749A (en) * 1970-08-14 1974-04-02 Sofredi Apparatus for regulating the duration of a square-wave signal in an electronic injection control installation for diesel engines
US3839997A (en) * 1971-07-21 1974-10-08 Sibe Fuel feed devices for internal combustion engines
US3987764A (en) * 1974-10-25 1976-10-26 International Harvester Company Timer means for sequential fuel injection
US4111171A (en) * 1975-05-12 1978-09-05 Nissan Motor Company, Limited Closed-loop mixture control system for an internal combustion engine using sample-and-hold circuits
US4205639A (en) * 1977-06-25 1980-06-03 Diesel Kiki Co., Ltd. Anti-stall device in a diesel engine
US4166439A (en) * 1977-10-21 1979-09-04 Hanan Golan Modified engine controlling system

Also Published As

Publication number Publication date
AR197948A1 (es) 1974-05-24
BR7100274D0 (pt) 1973-05-31
FR2088555B1 (de) 1973-06-08
CA932052A (en) 1973-08-14
DE2123589A1 (de) 1971-12-02
FR2088555A1 (de) 1972-01-07

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AS Assignment

Owner name: CARTER AUTOMOTIVE CORPORATION, INC., 9666 OLIVE BO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ACF INDUSTRIES, INCORPORATED;REEL/FRAME:004491/0867

Effective date: 19851212

AS Assignment

Owner name: CARTER AUTOMOTIVE COMPANY, INC., MISSOURI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ACF INDUSTRIES, INCORPORATED;REEL/FRAME:004715/0162

Effective date: 19870410

Owner name: CARTER AUTOMOTIVE COMPANY, INC., 9666 OLIVE BOULEV

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ACF INDUSTRIES, INCORPORATED;REEL/FRAME:004715/0162

Effective date: 19870410