| 摘要 |
PURPOSE:To detect only the obstacles that disturb the traveling of an unmanned vehicle by using a signal processing means to ensure the safe drive of the vehicle only in case the incident time of the output signal received from an ultrasonic wave sensor is longer than the time set by a delay time setting means in response to the driving speed of the vehicle. CONSTITUTION:An ultrasonic sensor SENS is set on an unmanned vehicle CAR driven on a set traveling course to oscillate the ultrasonic waves to the CAR and also receive the reflected waves from the obstacles existing on the course. The reflected waves received from a SENS1 of a safety running device for the CAR are amplified by an amplifying circuit AMP and inputted to a signal processing circuit SIG. At the same time, the traveling speed S of the CAR detected by a speed detector SPD is inputted to a delay time setting circuit TD. Then an output signal OUT is outputted when the duration of the input signal of the circuit SIG is longer than a delay time T set at the circuit TD. Thus the safety running is secured for the CAR.
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