Air-fuel ratio feedback control system including at least downstreamside air-fuel ratio sensor
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United States of America Patent
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-
Oct 23, 1990
Grant Date -
N/A
app pub date -
Jul 18, 1988
filing date -
Jul 20, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an air-fuel ratio feedback control system including at least one air-fuel ratio sensor downstream of a catalyst converter provided in an exhaust gas passage, an actual air-fuel ratio is controlled in accordance with the output of the downstream-side air-fuel ratio sensor. When the engine is transferred from an open loop control state such as a fuel cut-off state or an OTP incremental state to an air-fuel ratio feedback control state for a stoichiometric air-fuel ratio by the downstream-side air-fuel ratio sensor, the speed of changing an air-fuel ratio correction amount in accordance with the output of the downstream-side air-fuel ratio sensor is at a conventional speed before the switching of the output of the downstream-side air-fuel ratio sensor, but thereafter (only immediately after the switching of the output of the downstream-side air-fuel ratio sensor or for a predetermined time period), this speed is increased.
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