US4501242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-fuel ratio control apparatus
Assignee: Denso Corp
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Filing: 1983-04-01
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Granted: 1985-02-26
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Expires: 2003-04-01
Abstract
Abstract In an air-fuel ratio control apparatus for detecting the air-fuel ratio from the oxygen content of the exhaust gas from an engine and feedback controlling the air-fuel ratio at the desired ratio through an integrating circuit, the circuit constant of the integrating circuit is increased with increase in the altitude to improve the control response characteristic.
Inventors
- 👤 Yukihide Niimi
- 👤 Seietsu Yoshida
- 👤 Hidemi Ohnaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:59
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1477; F02D41/1482
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
In an air-fuel ratio control apparatus including an oxygen concentration detecting circuit for detecting the concentration of oxygen in an exhaust gas from an engine of a vehicle and comparing a detection signal with a predetermined value preset in correspondence to a predetermined air-fuel ratio to generate a first difference signal, an integrating circuit responsive to said first difference signal to generate an integration signal and an air-fuel ratio control circuit responsive to said integration signal to generate a control signal for energizing air-fuel ratio control means, the improvement comprising: an altitude detecting circuit for detecting an atmospheric pressure outside said vehicle and comparing a detection signal with a preset value set in correspondence to a predetermined altitude to generate a second difference signal; and an integration control circuit responsive to said second difference signal to control a circuit constant of said integrating circuit.
Claim 2
Dependent Claim
144 words
In an air-fuel ratio control apparatus including an oxygen concentration detecting circuit for detecting the concentration of oxygen in an exhaust gas from an engine of a vehicle and comparing a detection signal with a predetermined value preset in correspondence to a predetermined air-fuel ratio to generate a first difference signal, an integrating circuit responsive to said first difference signal to generate an integration signal and an air-fuel ratio control circuit responsive to said integration signal to generate a control signal for energizing air-fuel ratio control means, the improvement comprising: an altitude detecting circuit for detecting an atmospheric pressure outside said vehicle and comparing a detection signal with a preset value set in correspondence to a predetermined altitude to generate a second difference signal; and an integration control circuit responsive to said second difference signal to control a circuit constant of said integrating circuit.
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) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |