Air/fuel control with adaptively learned reference
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United States of America Patent
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Mar 14, 1995
Grant Date -
N/A
app pub date -
Feb 8, 1994
filing date -
Feb 8, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An engine air/fuel control system includes an apparatus and method for adaptively learning a reference voltage. Fuel delivered to the engine is trimmed by a feedback variable provided by integrating a two-state signal resulting from a comparison between the reference voltage and the exhaust gas oxygen sensor output. Each sample period of a microprocessor, a high voltage signal and low voltage signal are generated which track the outer envelope of the sensor signal. Calculation of a midpoint between high and low voltage signals provides the reference which instantaneously tracks the midpoint of the sensor signal.
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