Patent ID: 6865138

Claim:
A back-up detecting device with a distance reset capability for a large vehicle with a chassis and a rear end, the back-up detecting device comprising: a controller ( 10 ) having multiple inputs, multiple outputs, an intensity analysis program and a distance reset capability; multiple signal conversion circuits ( 11 ) connected to inputs of the controller ( 10 ); multiple ultrasonic transceivers ( 14 ) are mounted on the chassis underneath a vehicle ( 20 ) near the rear end ( 21 ), transmit ultrasonic sound waves, receive reflected sound waves, respectively have an output and are connected respectively to signal conversion circuits ( 11 ) through which the controller ( 10 ) controls the emission of ultrasonic pulses; a reset button ( 12 ) connected to an input of the controller ( 10 ) and initiates a distance reset function when the button ( 12 ) is depressed; a memory device ( 13 ) connected to the controller ( 10 ) and storing a distance pad D o ; and an alarm unit ( 15 ) connected to an output of the controller ( 10 ).