Apparatus and method for controlling air-fuel ratio of engine
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United States of America Patent
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Aug 3, 2004
Grant Date -
Dec 5, 2002
app pub date -
Jun 4, 2002
filing date -
Jun 4, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
When an output signal from an oxygen sensor is within a predetermined range including a value equivalent to a stoichiometric air-fuel ratio, the output signal is converted into air-fuel ratio data, to compute an air-fuel ratio control signal based on a deviation between the air-fuel ratio data and a target air-fuel ratio. When the output signal from the oxygen sensor is outside the predetermined range, it is judged based on the output signal whether an actual air-fuel ratio is richer or leaner than the target air-fuel ratio, to compute the air-fuel ratio control signal based on the judgment result.
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