US4376431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-fuel ratio control system with altitude compensator
Assignee: Mazda Motor Corp
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Filing: 1981-03-24
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Granted: 1983-03-15
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Expires: 2001-03-24
Abstract
Abstract An automobile air-fuel control system is incorporated with an altitude compensator in order to minimize an excessive enrichment of an air-fuel mixture which would occur when the engine is operated at a high altitude under a high load operating condition. This altitude compensator is constituted by a delay circuitry operable to delay the timing at which the supply of bleed air for leaning the mixture is interrupted when the engine is operated at a high altitude under the high loaded condition.
Inventors
- 👤 Katsuhiko Yokooku
- 👤 Katsuyoshi Iida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:14
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0002; F02D41/02; F02D41/14; F02D41/1438; F02D41/1486; F02D41/1487; F02D2200/00; F02D2200/70; F02D2200/703; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
237 words
An air-fuel ratio control system for an internal combustion engine including a combustion chamber, a mixture intake passage means for supplying a combustible mixture to the combustion chamber, and exhaust passage means including a catalytic converter installed thereon between the engine and the atmosphere, said control system comprising a composition sensor provided on the exhaust passage means at a position between the engine and the catalytic converter for detecting the concentration of a particular component obtained in exhaust gases emitted from the engine, said concentration being a function of the air-fuel mixing ratio of the combustible mixture burned in the engine, a control unit receiving an output signal from the composition sensor and generating a control signal based on the output signal from the composition sensor, an actuator for regulating the air-fuel mixing ratio of the combustible mixture to be supplied to the combustion chamber in response to the control signal from the control unit, a high load compensator circuitry for bringing the actuator into a predetermined operative position for supplying a enriched combustible mixture to the combustion chamber in response to an occurance of a high load operating condition of the engine and irrespective of the application of the control signal to the actuator, and a delay circuitry operable in response to reduction in atomospheric pressure for delaying for a predetermined delay time the timing at which the actuator is brought into the predetermined operative position.
Claim 2
Dependent Claim
237 words
An air-fuel ratio control system for an internal combustion engine including a combustion chamber, a mixture intake passage means for supplying a combustible mixture to the combustion chamber, and exhaust passage means including a catalytic converter installed thereon between the engine and the atmosphere, said control system comprising a composition sensor provided on the exhaust passage means at a position between the engine and the catalytic converter for detecting the concentration of a particular component obtained in exhaust gases emitted from the engine, said concentration being a function of the air-fuel mixing ratio of the combustible mixture burned in the engine, a control unit receiving an output signal from the composition sensor and generating a control signal based on the output signal from the composition sensor, an actuator for regulating the air-fuel mixing ratio of the combustible mixture to be supplied to the combustion chamber in response to the control signal from the control unit, a high load compensator circuitry for bringing the actuator into a predetermined operative position for supplying a enriched combustible mixture to the combustion chamber in response to an occurance of a high load operating condition of the engine and irrespective of the application of the control signal to the actuator, and a delay circuitry operable in response to reduction in atomospheric pressure for delaying for a predetermined delay time the timing at which the actuator is brought into the predetermined operative position.
Claim 3
Dependent Claim
82 words
A system as claimed in claim 1, wherein said high load compensator comprises a high load detector for detecting the high load engine operating condition and generating the high load signal indicative of the occurrence of the high load engine operating condition and a compensation signal generator operable in response to the high load signal for generating a compensation signal, said compensation signal being applied to the actuator to bring the latter into a predetermined operative position irrespective of the control signal.
Claim 4
Dependent Claim
23 words
A system as claimed in claim 2, wherein said delay circuitry is inserted between the high load detector and the compensation signal generator.
Claim 5
Dependent Claim
36 words
A system as claimed in claim 3, wherein the delay circuitry comprises a RC circuit having a predetermined time constant determinative of the predetermined delay time and includes a sensor for detecting change in atmospheric pressure.
Claim 6
Dependent Claim
32 words
A system as claimed in claim 1, wherein said intake passage comprises a carburetor, said carburetor being provided with said actuator, for thereby regulating the air-fuel mixing ratio of said combustible mixture.
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) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |