Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...
Patent
1995-11-17
1997-02-04
Kwon, John T.
Power plants
Internal combustion engine with treatment or handling of...
By means producing a chemical reaction of a component of the...
60274, F01N 300
Patent
active
055987036
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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Hamburg Douglas R.
Reed Dennis C.
Ford Motor Company
Kwon John T.
Lippa Allan J.
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