Internal combustion engine controller

Details Internal combustion engine controller Internal combustion engine controller

1992-08-31

1993-06-08

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Idle speed control

123520, 123518, 123519, F02M 300, F02M 3302

Patent

active

052169910

ABSTRACT:
An internal combustion engine in which a purge control valve is provided in a fuel vapor supply passage connecting a canister and an intake pipe of the internal combustion engine, the opening degree of the purge control valve is regulated by a purge flow rate control unit depending on operating condition of the internal combustion engine, and the opening degree of a rotational speed control valve is regulated to adjust an amount of intake air into the internal combustion engine, thereby changing a rotational speed of the internal combustion engine. While the internal combustion engine is idling in such a condition that the air/fuel ratio of a gas mixture supplied to the internal combustion engine is controlled to be held constant and the opening degree of the rotational speed control valve is regulated so that the rotational speed of the internal combustion engine reaches a target value, a controller operates to forcibly change the opening degree of the purge control valve from a first set opening degree to a second set opening degree, and determine the presence or absence of an abnormality in supply of fuel vapor to the intake pipe of the internal combustion engine through the supply passage and the purge control valve based on a change in the opening degree of the rotational speed control valve resulting at that time.

REFERENCES:
patent: 4741318 (1988-05-01), Kortge et al.
patent: 4945885 (1990-08-01), Gooze et al.
patent: 4951627 (1990-08-01), Wataraba et al.
patent: 5042448 (1991-08-01), Cook et al.
patent: 5069188 (1991-12-01), Cook
patent: 5136997 (1992-08-01), Takahashi et al.
patent: 5143040 (1992-09-01), Okawa et al.

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