Patent US4763628A successfully refreshed from Google Patents.
US4763628A
Expired / Lapsed
US
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Method of compensating output from oxygen concentration sensor of internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1987-03-02
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Granted: 1988-08-16
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Expires: 2007-03-02
Abstract
Abstract Compensation of an output from an oxygen concentration sensor of an air/fuel ratio control apparatus for an internal combustion engine is executed during engine warm-up, to correct for an erroneous component in the oxygen concentration sensor output data caused by incomplete combustion during warm-up. The degree of compensation applied is determined by the engine operating temperature, as represented by the cooling water temperature. Excessive richness of the air/fuel ratio of the mixture supplied to the engine during warm-up is thereby eliminated.
Inventors
- 👤 Toshiyuki Mieno
- 👤 Toyohei Nakajima
- 👤 Yasushi Okada
- 👤 Nobuyuki Oono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:27
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/06; F02D41/068; F02D41/14; F02D41/1438; F02D41/1486
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
131 words
A method of compensating the level of an output signal from an oxygen concentration sensor which comprises a portion of an internal combustion engine air/fuel ratio control system, said oxygen concentration sensor being disposed within the exhaust system of the internal combustion engine for producing an output signal varying in proportion to the concentration of oxygen in exhaust gas from said engine, the method comprising the steps of sensing an operating temperature of said engine, executing compensation of a level of said oxygen concentration sensor output signal in accordance with a result of said temperature sensing step, and utilizing the output level produced by said compensating step as the detected value of oxygen concentration that is employed in controlling the air/fuel ratio of the mixture to be supplied to said engine.
Claim 2
Independent Claim
131 words
A method of compensating the level of an output signal from an oxygen concentration sensor which comprises a portion of an internal combustion engine air/fuel ratio control system, said oxygen concentration sensor being disposed within the exhaust system of the internal combustion engine for producing an output signal varying in proportion to the concentration of oxygen in exhaust gas from said engine, the method comprising the steps of sensing an operating temperature of said engine, executing compensation of a level of said oxygen concentration sensor output signal in accordance with a result of said temperature sensing step, and utilizing the output level produced by said compensating step as the detected value of oxygen concentration that is employed in controlling the air/fuel ratio of the mixture to be supplied to said engine.
Claim 3
Dependent Claim
42 words
A compensation method according to claim 1, in which said oxygen concentration sensor output signal level is compensated such as to produce increasing degrees of richness of the air/fuel mixture supplied to said engine as the values of said operating temperature decrease.
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) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |