| 摘要 |
PURPOSE:To obtain an obstacle detector for a vehicle, which is capable of moving backward the vehicle safely enough, by outputting the information a road surface state behind the vehicle by an ultrasonic distance measurement. CONSTITUTION:A distance D to a road surface 6 is measured by width of a pulse outputted by an RS type FF11 which is set and reset responding to ultrasonic transmitting and receiving signals through ultrasonic transmitter and receiver 5, 7 provided on a rear bumper 19, etc. of a vehicle. When it is detected by the first and the second comparing circuits 15, 16 that the width of the output pulse of the FF11 corresponding to the distance D which is varied in accordance with unevenness of this road surface 6 is below a prescribed value and above other prescribed value, alarms by the first and the second alarming circuits 17, 18 are generated. According to this constitution, it is possible to obtain an obstacle detector for a vehicle, which is capable of moving backward the vehicle safely enough. |
