Patent ID: 7408448

Claim:
A parking sensor apparatus to keep air brakes from interfering with the parking sensor apparatus, the parking sensor apparatus comprising a microprocessor processing signals received by the parking sensor apparatus to determine whether the signals are reflected echoes or ultrasonic air brake noise; a memory device connected to the microprocessor and storing operational parameters and data; an ultrasonic transducer transmitting and receiving ultrasonic energy; an ultrasonic receiver connected to the ultrasonic transducer and transforming ultrasonic energy received by the ultrasonic transducer to an analog electronic signal; an analog to digital converter connected between the ultrasonic receiver and the microprocessor and converting the analog electronic signal from the ultrasonic receiver to a digital electronic signal used and processed by the microprocessor to determine whether the ultrasonic energy received by the ultrasonic transducer is a reflected echo or ultrasonic air brake noise; an ultrasonic transmitter connected between the microprocessor and the ultrasonic transducer to cause the ultrasonic transducer to emit an ultrasonic pulse; and an alarm device connected to and driven by the microprocessor to emit a warning when the microprocessor determines that the ultrasonic energy received by the ultrasonic transducer is a reflected echo.