The horn is one of the essential parts of the car, the main function is to alert pedestrians and surrounding vehicles around the vehicle, to protect the safety of the pedestrian and vehicles. In the paper, the pulse commands to control the servomotor drive and limit of the limit switches to control both synergies smooth movement and safe operation of the force transducer, to achieve the car steering wheel by range force and displacement data are continuously collected. At the same time, the Bessel filter based on virtual instrument software is used to process the data further, and the waveform of the sound force and the displacement is displayed by the oscilloscope. Experimental studies have shown that the system test precision, high stability, reliability, it can automatically complete rang force and displacement detection.
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