Feedback control system
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United States of America Patent
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-
Aug 30, 1994
Grant Date -
N/A
app pub date -
Apr 5, 1993
filing date -
Apr 5, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An air/fuel control system which includes feedback control from an exhaust gas oxygen sensor positioned upstream of a catalytic converter. The exact air/fuel ratio required optimum converter efficiency is determined by generating an emissions signal from both a HC/CO sensor and a NO sensor each positioned downstream of the catalytic converter. The feedback variable is trimmed by a signal derived from the emissions signal to maintain air/fuel operation at a value corresponding to maximum converter efficiency.
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