System and method for automatically controlling a vehicle speed

Details System and method for automatically controlling a vehicle speed System and method for automatically controlling a vehicle speed

1988-09-08

1990-10-30

Chin, Gary

Boots, shoes, and leggings

123352, 180179, B60K 3104

Patent

active

049673580

ABSTRACT:
A system and method for automatically controlling a vehicle speed to a desired cruising speed are disclosed in which such a control is inhibited that the opening angle is adjusted toward a prohibiting range in which an engine output torque becomes substantially constant even if the opening angle of the throttle valve is increased more than necessary. At this time, the opening angle is adjusted to a predetermined limit angle (for example, 40 degrees) and a transmission gear position is controlled depending on a difference between an instantaneous vehicle speed and a target vehicle speed. Therefore, unnecessary opening of the throttle valve exceeding the predetermined limit beyond which little increase in the engine output torque occurs can be avoided. In addition, the throttle valve can immediately be controlled from the predetermined limit to a target opening angle at which the vehicle speed can be maintained at the target vehicle speed.

REFERENCES:
patent: 4612615 (1986-09-01), Murakami
patent: 4656407 (1987-04-01), Burney
patent: 4698762 (1987-10-01), Moriya et al.

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