Method and apparatus for controlling fuel cut-off in an internal

Details Method and apparatus for controlling fuel cut-off in an internal Method and apparatus for controlling fuel cut-off in an internal

1983-12-14

1985-03-26

Cuchlinski, Jr., William A.

Internal-combustion engines

Engine speed regulator

Responsive to deceleration mode

123333, F02D 500

Patent

active

045066388

ABSTRACT:
In an internal combustion engine mounted on a four wheel drive (4WD) vehicle, the fuel cut-off engine speed (N.sub.c) and the fuel cut-off recovery engine speed (N.sub.R) are calculated in accordance with the coolant temperature of the engine. When the vehicle is in a 4WD mode, predetermined minimum values are set in the calculated fuel cut-off engine speed and the calculated fuel cut-off engine speed. When the throttle valve is completely closed and it is determined that the current engine speed is higher than the calculated fuel cut-off engine speed (N.sub.c) or the calculated fuel cut-off recovery engine speed (N.sub.R), which is selected in accordance with whether or not the fuel cut-off operation was being carried out, the fuel cut-off operation is carried out.

REFERENCES:
patent: 4204513 (1980-05-01), Bilbrey et al.
patent: 4305365 (1981-12-01), Iizuka et al.
patent: 4391243 (1983-07-01), Bessho
patent: 4392467 (1983-07-01), Miyagi et al.
patent: 4421082 (1983-12-01), Katayose et al.
patent: 4434759 (1984-03-01), Iezuka et al.

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