Automatic control device for preventing rear-end collision of motorized vehicles

Claim 1

An automatic control device for preventing rear-end collision of a front motorized vehicle and a rear motorized vehicle running behind said front vehicle, comprising: at least one signal emitter provided at the rear portion of said front motorized vehicle for emitting several signals each of which has a respective emitting frequency and a respective emitting distance, said signals defining a corresponding number of concentric receiving zones behind said front motorized vehicle; at least one signal receiver provided at the front of said rear motorized vehicle capable of receiving signals of the preset emitting frequencies emitted by said at least one signal emitter on said front vehicle and then transmitting at least a first signal in response to the receipt of a preset one of said several signals; a speed detector provided in said rear vehicle, adapted for continuously detecting the running speed of said rear vehicle and transmitting a second signal indicative of the detected speed; a brake controller provided in said rear vehicle, adapted for applying a brake to said rear vehicle when a braking signal is received; an accelerator pedal controller provided in said rear vehicle, adapted for restricting the motion of an accelerator control cable in response to movements of an accelerator pedal provided in said rear vehicle when an accelerator restriction signal is received; and, a microprocessor provided in said rear vehicle, adapted for receiving said second signal transmitted by said speed detector and presetting a receiving frequency of said signal receiver according to said second signal, and also adapted for receiving said first signal and transmitting a braking signal to said brake controller and an acceleration restriction signal to said accelerator pedal controller when a signal having said preset frequency is received by said signal receiver.