Air-fuel ratio control system for internal combustion engines
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United States of America Patent
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Mar 10, 1998
Grant Date -
N/A
app pub date -
Apr 26, 1996
filing date -
Apr 26, 1995
priority date (Note) -
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Abstract
An air-fuel ratio control system for an internal combustion engine controls the air-fuel ratio of a mixture supplied to the engine in response to an output from a first air-fuel ratio sensor arranged in an exhaust passage at a location upstream of a catalyst for purifying exhaust gases emitted from the engine. A control parameter for use in controlling an operation of the engine is changed when deterioration of the catalyst caused by sulfur poisoning is detected to desulfurize the catalyst.
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