US 11,988,548 B2
Method for identifying a change in the operating behavior of a crankshaft drive of a motor vehicle
Christopher Schmidt, Fürth (DE); and Roman Suchanek, Schwabach (DE)
Assigned to Man Truck & Bus SE, Munich (DE)
Appl. No. 17/264,696
Filed by MAN Truck & Bus SE, Munich (DE)
PCT Filed Jul. 25, 2019, PCT No. PCT/EP2019/070087
§ 371(c)(1), (2) Date Jan. 29, 2021,
PCT Pub. No. WO2020/025452, PCT Pub. Date Feb. 6, 2020.
Claims priority of application No. 102018118320.8 (DE), filed on Jul. 30, 2018.
Prior Publication US 2021/0317796 A1, Oct. 14, 2021
Int. Cl. G01H 11/02 (2006.01); F02D 41/22 (2006.01); F16F 15/10 (2006.01); G01M 13/028 (2019.01); G01M 15/04 (2006.01); G01M 15/12 (2006.01); F02D 41/00 (2006.01); G01M 13/021 (2019.01)
CPC G01H 11/02 (2013.01) [F16F 15/10 (2013.01); G01M 13/028 (2013.01); G01M 15/046 (2013.01); G01M 15/12 (2013.01); F02D 41/009 (2013.01); F02D 41/22 (2013.01); G01M 13/021 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method for detecting a change in an operating behavior of a crankshaft drive of a motor vehicle, wherein the crankshaft drive includes a crankshaft, a pulse generator rotating during operation of the crankshaft, and a fixed sensor unit, which generates a rotational speed signal N dependent on a rotational speed of the pulse generator, the method comprising:
detecting a current rotational speed signal Nakt of the fixed sensor unit during the operation of the crankshaft drive;
filtering the current rotational speed signal Nakt with a bandpass filter, which has: (a) a first passband range D1 including a first center frequency f1 and (b) a second passband range D2 including a second center frequency f2 different from the first center frequency f1;
comparing the filtered current rotational speed signal Nakt with a reference signal Nref stored in a memory; and
detecting the change in the operating behavior of the crankshaft drive based on the comparison of the filtered current rotational speed signal Nakt with the reference signal Nref.