Poor-road-surface detection

The poor-road-surface detection detects the poor-road-surface mode on a poor stretch of road (driving over stones, gravel or potholes) on the basis of the transferred wheel acceleration. In the case of poor-road-surface detection, a fault is stored and the misfire detection is briefly disabled. The disabling is necessary, as vibrations in the drive train due to poor road surfaces can leads to erroneous misfire detection. Is it also possible that the poor-road-surface detection takes effect too late (only after a misfire has already been erroneously detected). In this case, the combustion misfires are recognized as an incorrect diagnosis by the poor-road-surface detection system.

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