System for determining the fully-closed state of subsidiary thro

Details System for determining the fully-closed state of subsidiary thro System for determining the fully-closed state of subsidiary thro

1994-09-07

1996-10-08

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Open loop condition responsive

F02D 700

Patent

active

055620809

ABSTRACT:
A method for determining the fully-closed state of a subsidiary throttle valve. If a stable state judging circuit judges that there is no outside influence exerted on the operational state of the engine (a state in which the vehicle is stopped and the engine is in an idling state) even if the subsidiary throttle valve is fully closed, a valve closing circuit closes the subsidiary throttle valve and a fully-closed state determination is carried out. If the opening degree of the subsidiary throttle valve or the engine revolution number is largely varied during the determination process of the fully-closed state determination circuit, a valve-closing inhibiting circuit inhibits the closing of the subsidiary throttle valve to discontinue the determination. Even if all of the conditions for determination are satisfied again, the closing of the subsidiary throttle valve and the restarting of determination by the fully-closed state determination circuit are inhibited until the comparator circuit judges that the vehicle starts traveling and vehicle speed exceeds a reference value.

REFERENCES:
patent: 4359894 (1982-11-01), Ikeura et al.
patent: 4995364 (1991-02-01), Kamei et al.
patent: 5092420 (1992-03-01), Suguwara et al.
patent: 5113823 (1992-05-01), Iriyama
patent: 5151861 (1992-09-01), Danno et al.

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