Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture
Patent
1991-11-22
1992-09-29
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Exhaust gas used with the combustible mixture
123571, F02M 2507
Patent
active
051506947
ABSTRACT:
The air/fuel ratio of the combustion mixture in the cylinders of an engine is sensed and the sensed air/fuel ratio is controlled to a predetermined scheduled air/fuel ratio by controlling the amount of exhaust gases recirculated. When the exhaust gas recirculated is substantially zero, the air/fuel ratio is thereafter closed loop adjusted to a predetermined scheduled minimum air/fuel ratio when the sensed air/fuel ratio is less than the minimum and when the sensed air/fuel ratio is greater than the minimum while the operator command is at a maximum to thereby provide precise fuel limiting at a predetermined fuel limit schedule.
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Brown Michael J.
Currie James H.
Mitchell Mark A.
Peden Richard A.
Sczomak David P.
Conkey Howard N.
General Motors Corporation
Wolfe Willis R.
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