Method for determining a functional state of an ultrasound sensor, wherein a voltage is detected, and ultrasound sensor device with an ultrasound sensor

摘要

The invention relates to a method for determining a functional state of an ultrasonic sensor (5a) of an ultrasonic sensor device (5) for a motor vehicle (1), wherein a sound transducer element (11) of the ultrasonic sensor (5a) is excited with an electrical test signal (P), wherein the electrical Test signal (P) by an electrical current (I), an electrical voltage (V) and a frequency (f) is defined, and the functional state depending on an evaluation of the electrical test signal (P) is determined, wherein the sound transducer element (11) an electrical test signal (P) is excited, which has a predetermined known electrical current strength (I) and which is frequency modulated, and one of this electrical test signal (P) dependent electrical voltage (V) is detected at the sound transducer element (11) and depending on the detected voltage (V)) at least one value of the ultrasonic sensor (5a) electrically characterizing Paramet It is determined, which is compared with a value of a reference ultrasonic sensor electrically characterizing reference parameter and is determined depending on the comparison of the functional state of the ultrasonic sensor (5a). Furthermore, the invention relates to an ultrasonic sensor device (5).