Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1990-02-08
1991-09-24
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60280, 60286, F01N 302
Patent
active
050503766
ABSTRACT:
A control system for regenerating a particulate trap in the exhaust system of a diesel engine includes control logic which controls the air/fuel ratio of the engine by operating a backpressure valve in the engine exhaust system to provide a proper amount of excess oxygen to permit efficient combustion of the particulate content of the trap, but to avoid rapid and damaging combustion rates. Actual engine air/fuel ratio is compared to a commanded air/fuel ratio, and the position of the backpressure valve is adjusted accordingly. The commanded air/fuel ratio is ratcheted upwardly or downwardly once in a predetermined time period in response to a temperature error signal between exhaust gas temperature sensed in the engine exhaust manifold and a predetermined commanded temperature. An override is provided to permit the vehicle operator to override regeneration when power is required from the engine, and a low power cut-off is provided to suspend regeneration when the engine is operated for a period of time at low power conditions where regeneration is inefficient.
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Gabelman Brian C.
Hardy James A.
Stiglic Paul M.
Allied-Signal Inc.
Antonis William N.
Decker Ken C.
Hart Douglas
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