Method and apparatus for controlling air-fuel ratio in internal combustion engine
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United States of America Patent
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Jan 19, 1993
Grant Date -
N/A
app pub date -
May 31, 1991
filing date -
Jun 1, 1990
priority date (Note) -
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Abstract
In an air-fuel ratio control method and apparatus for an internal combustion engine supplied with a gas mixture of air and fuel, in which an actual air-fuel ratio is determined from exhaust gas components by using an O.sub.2 -sensor installed in an exhaust pipe of the engine, and the air-fuel ratio of the mixture gas to be supplied to the engine is controlled through feedback control on the basis of deviation of the actually detected air-fuel ratio from a reference value (A/F=14.7). Performance of the O.sub.2 -sensor is determined by making use of change in the air-fuel ratio output of the O.sub.2 -sensor at a time of interruption of the fuel supply to the engine or at a time the fuel supply to the engine is restarted.
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