Importance

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Abstract

An automatic vehicle speed controlling apparatus for a vehicle includes a vehicle speed sensor for sensing the actual speed of the vehicle and providing actual speed data proportional to the actual speed of the vehicle, a command switch operable for generating a cruise command signal and an actuator for driving a throttle valve with the vehicle. The control unit is responsive to the actual speed data and the cruise command signal and includes storage memory for storing a desired speed datum in response to the cruise command signal. The control unit selectively generates a speed increasing signal and a speed decreasing signal in response to a difference between the actual speed data and the desired speed datum stored in the memory and supplying the speed increasing signal and the speed decreasing signal to the actuator. The control unit continues generating the speed increasing signal and successively generates the speed decreasing signal when the difference between the actual speed data and the desired speed datum reaches a first predetermined value while the vehicle is accelerated with the speed increasing signal. The control unit further detects the acceleration value of the vehicle derived from the change rate of the actual speed data supplied from the vehicle speed sensor and generates the speed decreasing signal when the difference between the actual speed data and the desired speed datum reaches a second predetermined value greater than the first predetermined value after the acceleration of the vehicle exceeds a predetermined acceleration value.

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First Claim