| 摘要 |
In a method and system, the condition of a valve drive, particularly of valve clearance, and the position of at least one valve opening cam of a cam shaft of an internal combustion engine are recorded from processing signals which are generated by at least one impact sound sensor such as an electronic spark sensor. Preferably, at least one characteristic signal sequence is identified from signals generated by the impact sound sensor. The sequence occurs at a particular time during a cycle of the internal combustion engine, and is compared to a stored reference signal. As a result, the condition of a valve drive, e.g. the valve clearance, and/or the position of at least one valve opening cam of the cam shaft can be deduced.
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