Patent US3672345A successfully refreshed from Google Patents.
US3672345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic injection-controlling system for internal combustion engines
Assignee: Societe des Procedes Modernes dInjection SOPROMI
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Filing: 1970-04-02
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Granted: 1972-06-27
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Expires: 1990-04-02
Abstract
Abstract The injection controlling circuit in an internal combustion engine of a known type comprising a flip-flop controlled by the rotation of the engine so as to generate at predetermined moments injection-controlling signals, in association with a circuit producing end-of-injection signals in accordance with the operative parameters of the engine, means are provided to terminate the injections whenever there is a too sudden modification in the admission of fuel to the engine. To this end, the acceleration pedal controls the slider of a potentiometric voltage divider and a sudden shifting of said slider charges a condenser which prevents operation of the flip-flop. This is accomplished for by the application of a pulse by the transiently charged condenser to the base of a transistor which is thus rendered conductive and which grounds the input of the flip-flop through its collector-emitter circuit connected between said input and ground.
Inventors
- 👤 Louis A Monpetit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:58
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/12; F02D41/123; Y; Y10; Y10S; Y10S261/00; Y10S261/69
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
325 words
In an electronically controlled fuel injection system for an internal combustion engine for driving a vehicle, the engine having a device for setting the power level of the engine between minimum and maximum power levels, the system comprising a pulse generator operatively connected with a rotatable shaft of the engine, a switching circuit activated by each pulse from the pulse generator to produce an injection signal which is applied to an electro-magnetic fuel injector including a multivibrator circuit which is released by a pulse applied to an input thereof, the duration of the injection signal determining the opening duration of the fuel injector and hence the quantity of fuel injected, and control means acting on the switching circuit for varying the duration of the injection signal according to the operating conditions of the engine, the improvement comprising a. means for providing a power signal in response to any predetermined incremental decrease in the setting of the engine power level device including a potentiometric voltage divider, a slider for said voltage divider positioned in response to the engine power level device, the predetermined incremental decrease being that between any greater and lesser power level setting in the range of power level settings of the device, and b. means connected to the switching circuit and responsive to the power signal for interrupting the operation of the switching circuit and thereby the fuel injeCtion, including a condenser adapted to have its charge changed through the slider upon shifting of the latter, a resistance inserted between the condenser and the slider, a transistor the collector of which is connected with the multivibrator input and the emitter of which is grounded, a diode connecting the condenser with the base of the transistor, and resistances grounding the terminals of the diode, the transient pulses generated by a rapid shifting of the slider being applied to the base of the transistor, whereby the transistor grounds the multivibrator and renders it transiently inoperative.
Claim 2
Dependent Claim
325 words
In an electronically controlled fuel injection system for an internal combustion engine for driving a vehicle, the engine having a device for setting the power level of the engine between minimum and maximum power levels, the system comprising a pulse generator operatively connected with a rotatable shaft of the engine, a switching circuit activated by each pulse from the pulse generator to produce an injection signal which is applied to an electro-magnetic fuel injector including a multivibrator circuit which is released by a pulse applied to an input thereof, the duration of the injection signal determining the opening duration of the fuel injector and hence the quantity of fuel injected, and control means acting on the switching circuit for varying the duration of the injection signal according to the operating conditions of the engine, the improvement comprising a. means for providing a power signal in response to any predetermined incremental decrease in the setting of the engine power level device including a potentiometric voltage divider, a slider for said voltage divider positioned in response to the engine power level device, the predetermined incremental decrease being that between any greater and lesser power level setting in the range of power level settings of the device, and b. means connected to the switching circuit and responsive to the power signal for interrupting the operation of the switching circuit and thereby the fuel injeCtion, including a condenser adapted to have its charge changed through the slider upon shifting of the latter, a resistance inserted between the condenser and the slider, a transistor the collector of which is connected with the multivibrator input and the emitter of which is grounded, a diode connecting the condenser with the base of the transistor, and resistances grounding the terminals of the diode, the transient pulses generated by a rapid shifting of the slider being applied to the base of the transistor, whereby the transistor grounds the multivibrator and renders it transiently inoperative.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |