| 摘要 |
The invention relates to a circuit (1) for checking the functional status of a sensor device (2), in particular a knock sensor for engine monitoring and a corresponding method with at least one switch device (7), for activating a check circuit, an AC source (3), to deliver an AC voltage to the sensor device (2) under test, a recording device (4), to record a check signal for the capacitance (20) of the sensor device (2) and an analytical device (5), for analysing the check signal for the capacitance (20) in order to determine the functional state of the sensor device (2).
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