The invention provides a road obstacle
detector. The road obstacle
detector comprises an ultrasonic wave
range finding sensor, a
control unit, a computer
system, an
alarm device and a power supply device, wherein the ultrasonic wave
range finding sensor includes an ultrasonic wave emitter and an ultrasonic wave receiving device; the ultrasonic wave emitter is used for emitting an ultrasonic wave
signal to a front portion; the ultrasonic wave receiving device is used for receiving a reflected ultrasonic wave
signal; the
control unit calculates a difference
value of time for emitting the ultrasonic wave
signal and time for receiving the reflected ultrasonic wave signal, compares the difference value and a preset
time difference value and determines whether there is an obstacle in front of a road, and if there is the obstacle, the
control unit further calculates an obstacle height; the computer
system receives the obstacle height and compares the obstacle height with a preset height threshold, if the obstacle height is greater than the preset height threshold, a vehicle can not pass through and an alarm
control signal is emitted; the
alarm device emits an
alarm signal according to an alarm
control signal; and the power supply device provides power for an internal source of the vehicle and the ultrasonic wave
range finding sensor. By using the
detector of the invention, an early warning effect can be reached so that unnecessary losses during a vehicle running process are reduced.