Detection of the blocking of an ultrasonic sensor for the detection of a structure-borne sound signal by means of airborne sound reflection

摘要

The invention relates to a sensor device (1) for a vehicle (3) having an ultrasonic sensor (10) which is arranged to detect a structure-borne sound signal on a vehicle component (2) of the vehicle (3) and to transmit vibration energy to the vehicle component (2). is mechanically coupled, wherein the sensor device (1) is adapted to detect a blocking of the sensor device (1) in a test mode based on a test signal. In order to reliably detect a blockage of an ultrasonic sensor and / or a sensor device, the ultrasonic sensor (10) is designed to excite the vehicle component (2) to vibrate by the test signal, and the vehicle component (2) is designed based on the test signal excited vibration to send an airborne sound signal (32). A reflection surface (12) of the sensor device (1) is designed to emit a reflection signal (33) of the airborne sound signal (32) and the ultrasound sensor (10) is designed to detect the blockage on the basis of the reflection signal (33) of the airborne sound signal (32).