Man Truck & Bus Ag

Man Truck & Bus Se.

Christopher Schmidt

Wolfgang Burkhardt

Roman Suchanek

The disclosure relates to a method for identifying a change in the operating behavior of a crankshaft drive of a motor vehicle. In particular, the disclosure relates to a method for identifying error states of a torsional-vibration damper in the crankshaft drive, such as a jamming or slipping of a secondary mass of the torsional-vibration damper. The crankshaft drive comprises a crankshaft, a pulse generator that rotates when the crankshaft is in operation and a fixed sensor device, which generates a rotational speed signal N as a function of the rotational speed of the pulse generator. The method comprises the following steps: detecting a current rotational speed signal Nof the sensor device during operation of the crankshaft drive; filtering the current rotational speed signal Nusing a bandpass filter that has at least one first passband range D1 comprising a first center frequency f1; comparing the filtered current rotational speed signal Nwith a reference signal Nstored in a memory; and identifying a change in the operating behavior of the crankshaft drive on the basis of the comparison of the filtered current rotational speed signal Nwith the reference signal N. The disclosure further relates to a vehicle, such as a commercial vehicle, having a control device which is configured to perform a method of this kind.

Method for identifying a change in the operating behavior of a crankshaft drive of a motor vehicle

A method for detecting a change in the operating behaviour of a crank drive of a motor vehicle such as cracks in the crank drive or for detecting bearing wear. The crank drive includes a crankshaft, a pulse generator generating a signal S dependent on the rotational speed of the pulse generator and the distance of the pulse generator away from the sensor device. The method includes steps of detection of a current signal Sof the sensor device during the operation and comparing the current signal Swith a reference signal Sstored in a memory and detecting a change in the operating behaviour of the crank drive such as cracks in the crank drive or bearing wear, from the comparison of the current signal Swith the reference signal S.

Growing community of inventors

Fürth, Germany

Christopher Schmidt