Air/fuel control system for an internal combustion engine
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United States of America Patent
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-
Feb 4, 1997
Grant Date -
N/A
app pub date -
Nov 17, 1995
filing date -
Nov 17, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An air/fuel control system having a feedback variable generated by modulating fuel flow into the engine, generating an error signal from a difference between the average of an exhaust gas oxygen sensor output and a reference value correlated with a desired air/fuel ratio, and integrating the error signal. The reference value is periodically offset in both lean and rich air/fuel directions. A biasing signal is generated from an exhaust gas oxygen sensor position downstream of the converter in response to the air/fuel offset. After removing the offset from the reference value, the bias signal is applied thereto for centering engine air/fuel operation within the peak efficiency window of a catalytic converter.
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