Double air-fuel ratio sensor system in internal combustion engine
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United States of America Patent
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Apr 26, 1988
Grant Date -
N/A
app pub date -
Feb 21, 1986
filing date -
Feb 22, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a double air-fuel ratio sensor system including two air-fuel ratio sensors upstream and downstream of a catalyst converter provided in an exhaust passage, the actual air-fuel ratio is adjusted in accordance with an air-fuel ratio correction amount calculated by using the output of the upstream-side air-fuel ratio sensor and an air-fuel ratio feedback control parameter such as delay time periods, skip amounts, or integration amounts calculated by using the output of the downstream-side air-fuel ratio sensor, and the calculation of the air-fuel ratio feedback control parameter is prohibited when the downstream-side air-fuel ratio sensor is in an abnormal state.
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