Engine control system for maintaining idle speed

Details Engine control system for maintaining idle speed Engine control system for maintaining idle speed

1995-06-05

1996-02-20

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Idle speed control

60285, 12333917, F02D 4116, F02P 515

Patent

active

054920949

ABSTRACT:
An engine controller (12) controls engine idle speed via control of a bypass throttle valve (96) and an ignition timing system (88). The ignition system (88) also provides a retard in ignition timing during cold operation to rapidly warm a catalytic converter (20) coupled to the engine exhaust (48). When first entering the idle speed control mode, an initial throttle position corresponding to an initial desired inducted mass air flow is first provided as a function of predetermined conditions such as air conditioner status. This initial value (238, and 402-412) is corrected to prevent any decrease in idle speed which would otherwise occur as a result of the afore-mentioned retard in ignition timing.

REFERENCES:
patent: 4144853 (1979-03-01), Maruoka et al.
patent: 4399789 (1983-08-01), Yano
patent: 5050551 (1991-09-01), Morikawa
patent: 5241855 (1993-09-01), Cullen et al.
patent: 5303168 (1994-04-01), Cullen et al.

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