US3788285A
Expired / Lapsed
US
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Electronic fuel injection control device
Assignee: Renault SA
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Filing: 1971-12-06
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Granted: 1974-01-29
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Expires: 1991-12-06
Abstract
Abstract An electronic injection control device for an internal combustion engine comprising an air input pick-up consisting of a helix disposed within the air induction manifold, a photo-diode cell and a light source, the pick-up delivering through the medium of an electronic generator signals in the form of gating pulses having a duration equal to a frequency proportional to the measured air input, an electronic power assembly responsive to the generator and an electronic corrective assembly for modifying the duration of the gates as a function of various parameters, the signals controlling the injection action of the fuel injector.
Inventors
- 👤 Jacques A Gelin
- 👤 Alain J Dera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:34
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/10; G01F1/12; G01F1/125; F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/182; F02D41/185; G01F1/103; G01F1/20; G01F1/32; G01F1/3236; G01F15/00; G01F15/07; G01F15/075; G01F15/0755
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
200 words
An electronic injection control device for an internal combustion engine having an air-throttling butterfly valve mounted in an induction pipe, injectors comprising solenoidoperated valves which open when energized for injecting fuel into the engine cylinders, and an air-input pick-up inserted in said induction pipe on one side of said butterfly valve for measuring by its rotational speed the volume of incoming air, and an electronic generator for delivering to said injectors rectangular control signal gating pulses of equal time duration and having a frequency proportional to the measured air throughput and to the quantity of fuel to be injected, said pick-up comprising a helix associated with a mirror, both rotating freely within the induction pipe and being spaced apart from said air-throttling butterfly valve, a photo-diode cell associated with said mirror, for determining the rotational speed of said helix, and a light source for illuminating said mirror, said photo-diode cell being associated with said control signal generator for emitting injection control gating pulse signals at a frequency proportional to the velocity of rotation of said helix, and an electronic assembly, responsive to the signals emitted by said generator, controlling all said injectors for releasing the injection action of each injector.
Claim 2
Dependent Claim
200 words
An electronic injection control device for an internal combustion engine having an air-throttling butterfly valve mounted in an induction pipe, injectors comprising solenoidoperated valves which open when energized for injecting fuel into the engine cylinders, and an air-input pick-up inserted in said induction pipe on one side of said butterfly valve for measuring by its rotational speed the volume of incoming air, and an electronic generator for delivering to said injectors rectangular control signal gating pulses of equal time duration and having a frequency proportional to the measured air throughput and to the quantity of fuel to be injected, said pick-up comprising a helix associated with a mirror, both rotating freely within the induction pipe and being spaced apart from said air-throttling butterfly valve, a photo-diode cell associated with said mirror, for determining the rotational speed of said helix, and a light source for illuminating said mirror, said photo-diode cell being associated with said control signal generator for emitting injection control gating pulse signals at a frequency proportional to the velocity of rotation of said helix, and an electronic assembly, responsive to the signals emitted by said generator, controlling all said injectors for releasing the injection action of each injector.
Claim 3
Dependent Claim
68 words
An electronic injection control device according to claim 1 wherein said helix includes a plurality of blades and said pick-up further comprises a casing, a shaft connected to said casing and carrying said helix and said mirror, an inlet plug connected to said casing containing in channels registering with said mirror said light source, illuminating said mirror and said photo-diode cell receiving the light beam from said mirror.
Claim 4
Dependent Claim
52 words
An electronic injection control device according to claim 1 wherein said generator delivering control signal gating pulses comprises a transistorized flip-flop associated with said photo-diode cell, an amplifying transistor, and a monostable multivibrator receiving through a capacitor the signal transmitted by said amplifying transistor and emitting gated rectangular pulses of adjustable width.
Claim 5
Dependent Claim
56 words
An electronic injection control device according to claim 1 wherein said electronic assembly comprises a first transistorized flip-flop receiving the signals from said electronic generator, a power transistor inserted in the circuit of a coil of said solenoid operated valves and of a transistor of said first flip-flop, and a second flip-flop controlling said power transistor.
Claim 6
Dependent Claim
115 words
An electronic injection control device according to claim 1 wherein said electronic assembly comprises a potentiometer connected to a member controlling engine acceleration, a pair of transistors, one of the n-p-n type and the other of the p-n-p type, each connected to said potentiometer Through a capacitor, the output pulses of one transistor corresponding to acceleration and the output pulses of the other transistor corresponding to deceleration, said output pulses having independent time constants, an adder comprising an operational amplifier receiving said output pulses and pulses corresponding to parameters of atmospheric pressure and temperature, so as to emit adjustable voltages transmitted to said electronic generator for correcting the duration of said control signal gating pulses.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |