Air-fuel ratio control system for internal combustion engines
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United States of America Patent
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-
Apr 18, 1995
Grant Date -
N/A
app pub date -
Oct 15, 1993
filing date -
Oct 20, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An air-fuel ratio control system for an internal combustion engine having a catalytic converter arranged in the exhaust system, and an air-fuel ratio sensor arranged upstream of the catalytic converter calculates an air-fuel ratio correction amount by means of proportional control and integral control based on an output from the air-fuel ratio sensor, and controls an air-fuel ratio of a mixture supplied to the engine, based on the air-fuel ratio correction amount. A control frequency at which the air-fuel ratio control is carried out is increased when deterioration of the catalytic converter is detected.
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