Engine control for enhanced catalyst warm up while maintaining m

Details Engine control for enhanced catalyst warm up while maintaining m Engine control for enhanced catalyst warm up while maintaining m

1995-02-24

1996-03-12

Wolfe, Willis R.

Internal-combustion engines

Engine speed regulator

Idle speed control

12333923, 123422, F02D 4116, F02M 306, F02P 5145

Patent

active

054977452

ABSTRACT:
An engine controller (12) controls an ignition system (88) and bypass throttle valve (96). An ignition timing signal is set to an initial value as a function of engine (10) operating parameters. The timing signal is retarded during cold operation to rapidly warm a catalyst converter (20) coupled to the engine exhaust (48). When the vacuum in the intake manifold (44) falls below a threshold level, the ignition timing signal is advanced beyond the initial value. The ignition timing signal is retarded back towards its initial value when the manifold vacuum exceeds the threshold value. Concurrently, the initial timing signal is controlled to achieve desired engine idle speed.

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