Patent US2385075A successfully refreshed from Google Patents.
Patent US4048479A successfully refreshed from Google Patents.
US4048479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optimum air/fuel mixture computer for internal combustion engines
Assignee: Renault SA
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Filing: 1976-05-28
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Granted: 1977-09-13
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Expires: 1996-05-28
Abstract
Abstract In a computer for calculating the optimum mixture of combustion agent and fuel for an internal combustion engine, of the type comprising a monostable univibrator operating in synchronism with the rotational velocity of the engine and generating electric pulses of a width subordinate to the value of the voltage measured by a probe for making the chemical analysis of the gases in the exhaust manifold, the thus measured voltage being processed in a regulator provided with an intermediate integrator, said electric pulses being utilized for determining the opening time of a solenoid valve controlling the output of a fluid, whether combustion agent or fuel, of which the metering is measured by said probe, provision is made of a bistable univibrator coupled at one end to the output of a first comparator having one input connected to said chemical analysis probe via an integration type regulating circuit, said univibrator being connected at its other input to a pulse generator opening in synchronism with the rotational movement of the engine, by one of its outputs to an integrator comprising a current amplifier in series with a capacitor and connected to the second input of said first comparator, said one output being also connected to the device controlling the opening time of said solenoid valve, and by its other output to one input of a discharge device for said capacitor.
Inventors
- 👤 Jean-Pierre Rivere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:31
CPC Classifications
F; F02; F02D; F02D35/00; F02D35/0015; F02D35/0046; F02D35/0092; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
227 words
In a computer for calculating the optimum mixture of combustion agent and fuel for an internal combustion engine, of the type comprising a monostable univibrator operating in synchronism with the rotational velocity of the engine and generating electric pulses of a width subordinate to the value of the voltage measured by a probe for making the chemical analysis of the gases in the exhaust manifold, the thus measured voltage being processed in a regulator provided with an intermediate integrator, said electric pulses being utilised for determining the opening time of a solenoid valve controlling the output of a fluid, whether combustion agent or fuel, of which the metering is measured by said probe, provision is made of a bistable univibrator coupled at one end to the output of a first comparator having one input connected to said chemical analysis probe via an integration type regulating circuit, said univibrator being connected at its other input to a pulse generator operating in synchronism with the rotational movement of the engine, by one of its outputs to an integrator comprising a current amplifier in series with a capacitor and connected to the second input of said first comparator, said one output being also connected to the device controlling the opening time of said solenoid valve, and by its other output to one input of a discharge device for said capacitor.
Claim 2
Dependent Claim
227 words
In a computer for calculating the optimum mixture of combustion agent and fuel for an internal combustion engine, of the type comprising a monostable univibrator operating in synchronism with the rotational velocity of the engine and generating electric pulses of a width subordinate to the value of the voltage measured by a probe for making the chemical analysis of the gases in the exhaust manifold, the thus measured voltage being processed in a regulator provided with an intermediate integrator, said electric pulses being utilised for determining the opening time of a solenoid valve controlling the output of a fluid, whether combustion agent or fuel, of which the metering is measured by said probe, provision is made of a bistable univibrator coupled at one end to the output of a first comparator having one input connected to said chemical analysis probe via an integration type regulating circuit, said univibrator being connected at its other input to a pulse generator operating in synchronism with the rotational movement of the engine, by one of its outputs to an integrator comprising a current amplifier in series with a capacitor and connected to the second input of said first comparator, said one output being also connected to the device controlling the opening time of said solenoid valve, and by its other output to one input of a discharge device for said capacitor.
Claim 3
Dependent Claim
31 words
Computer according to claim 1, wherein said integrating regulator comprises a second comparator connected on the one hand to said probe and on the other hand to a reference voltage generator.
Claim 4
Dependent Claim
69 words
Computer according to claim 1, wherein said integrating regulator comprises in succession a probe amplifier, said second comparator and a second integrator, said amplifier of the high impedance type comprising a pair of resistors constituting a double feedback yielding an input potential higher than the residual voltage of an input transistor and a dividing bridge restoring the biasing voltage to a low value across the terminals of said resistor.
Claim 5
Dependent Claim
183 words
Computer according to claim 3, wherein said integrator is of the type comprising a capacitor associated with a charge circuit and with a discharge circuit, said second integrator comprising a first transistor connected through its base to the terminals of a resistor inserted in the collector of one of the pair of transistors constituting said second comparator circuit, said first transistor being connected to the positive terminal of the circuit through the series connection of a pair of resistors with its collector, the junction point of said last-mentioned pair of resistors being inserted in the loop circuit comprising said junction point connected to the base of a first transistor having its collector connected to the base of a second transistor having in turn its collector connected to the base of a third transistor having its collector connected in turn to the collector of a fourth transistor having in turn its base connected to the collector of a fifth transistor having its emitter connected to the emitter of a sixth transistor having its base connected to said junction point of said pair of resistors.
Claim 6
Dependent Claim
94 words
Computer according to claim 4, wherein the junction point point between the collector of said third and fourth transistors is connected to the high potential side of the circuit via the parallel connection of said integrating capacitor and a Zener diode, the emitter of the third transistor being connected to the high potential side of said circuit via a resistance, the emitter of the fourth transistor being grounded via another resistor whereas the output of the first integrating circuit is connected to the junction point of the collectors of said third and fourth transistors.
Claim 7
Dependent Claim
100 words
Computer according to claim 4, wherein the base of the fourth transistor is grounded via a first Zener diode, the base of said second transistor is also grounded but via a second Zener diode, the base of the fifth transistor being connected on the one hand to the high voltage side of the circuit via a first resistor and on the other hand to the collector of the sixth transistor via a second resistor, and a third resistor is connected in series with the collector of the sixth transistor between the junction point of said second resistor and the ground.
Claim 8
Dependent Claim
36 words
Computer according to claim 2, wherein said integrating regulator consists of a pair of field-effect transistors mounted as a comparator, one transistor supplying an integration capacitor and the other a transistor for discharging said integrating capacitor.
Claim 9
Dependent Claim
108 words
Computer according to claim 2, further comprising a feedback path between the second output and the first input of said bistable univibrator, which comprises a first transistor having its base connected to said second output via a resistor, the emitter of said first transistor comprising an adjustable potentiometer while the collector of said first transistor is connected to the capacitor and to the base of one of said pair of transistors constituting the first comparator, the collector of the base of said one transistor of the pair being connected to the base of a third transistor having its collector connected to the first input of the bistable univibrator.
Claim 10
Dependent Claim
88 words
Computer according to claim 4, wherein said univibrator has its first output connected to the base of the transistor of said first comparator via an amplifier comprising a pair of transistors, the junction point between the collector of said first transistor and said capacitor of said first integrator being connected to the collector of the second transistor of said amplifier, whereas the emitter of this second transistor is connected to the high voltage side of said circuit, whereby the second transistor constitutes the discharge circuit of said capacitor.
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) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |