Air-fuel ratio control method for internal combustion engines
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United States of America Patent
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Oct 27, 1992
Grant Date -
N/A
app pub date -
Dec 23, 1991
filing date -
Dec 28, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An air-fuel ratio control method for an internal combustion engine. The air-fuel ratio of an air-fuel mixture supplied to the engine is feedback-controlled to a predetermined value in response to an output from the exhaust gas ingredient concentration sensor. The temperature of at least one component part of the engine, which should be controlled, is estimated based on the detected temperature of exhaust gases, engine rotational speed, and engine load. The air-fuel ratio of the air-fuel mixture is inhibited from being feedback-controlled but enriched, when the estimated temperature of any one of the at least one component part of the engine is higher than a corresponding predetermined value.
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