| 摘要 |
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.
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