Constant-speed cruise control apparatus for a vehicle

Motor vehicles – With means responsive to speed of vehicle for maintaining... – Including electrically actuated servomechanism

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Details

74860, 180170, 3644241, 36442604, B60K 3104

Patent

active

049828053

ABSTRACT:
The invention relates to a constant-speed cruise control apparatus for automatically controlling the cruise speed of a vehicle to permit the vehicle to cruise at a constant speed. The gradient of a road is estimated on the basis of an actual cruise speed of the vehicle, the opening of a throttle valve, and cruise performance characteristics of the vehicle which indicates the relationship between the cruise speed and the opening of a throttle valve. If it determines that the road is uphill, and moreover, the absolute value of a speed deviation (i.e., a deviation of the actual cruise speed froma target speed) is more than a predetermined value, shifting down is carried out. Subsequently, if the absolute value of the speed deviation is less than another predetermined value, and moreover, it is determined that the road is downhill, shifting up is carried out. Through such shift-up and shift-down control on the basis of both the speed deviation and the road gradient, it is possible to perform speed change control according to the conditions of the surface of a road, thereby carrying out a highly reliable constant speed cruise of the vehicle.

REFERENCES:
patent: 4202424 (1980-05-01), Sakakibara et al.
patent: 4421192 (1983-12-01), Ito et al.
patent: 4463822 (1984-08-01), Tanigawa et al.
patent: 4697478 (1987-10-01), Mastumoto et al.
patent: 4829435 (1989-05-01), Isono

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