Importance

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Abstract

A cruising control apparatus for a vehicle, which comprises a vehicle speed sensor, a command switch, a microcomputer for generating an actuator control signal and including a vehicle speed signal memory and a watch-dog signal generator for generating a pulse signal with a predetermined period, an actuator for driving a throttle valve, an actuator driving circuit for driving the actuator in response to the actuator control signal, a watch-dog signal detector for discriminating whether the pulse signal is normal or not, a prohibiting circuit for opening the actuator driving circuit when the pulse signal is abnormal, and the microcomputer further includes vehicle speed decision means for deciding the vehicle speed signal being higher than a predetermined upper limit signal or lower than a predetermined lower limit signal and means for maintaining the watch-dog signal generator in an OFF-state in response to the result of the vehicle speed decision means.

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First Claim