Patent ID: 9463687
Filing Date: 2016-10-11
CPC Classification: B60K,B60W,F16H,Y02T,Y10S

Claim Text:
1. Method for operating a drive unit for a hybrid vehicle, whereas the drive unit comprises a drive assembly ( 3 ) with an internal combustion engine ( 1 ) and an electric motor ( 2 ) and a transmission ( 5 ) featuring several sub-transmissions ( 6 , 7 ) shifting between the drive assembly ( 3 ) and an output ( 4 ), whereas, through a planetary transmission ( 10 ), the electric motor ( 2 ) is coupled to an input shaft ( 8 ) of a first sub-transmission ( 6 ) and an input shaft ( 9 ) of a second sub-transmission ( 7 ) shifted in parallel to the first sub-transmission ( 6 ), whereas, through a frictional-locking separating clutch ( 11 ), the internal combustion engine ( 1 ) is able to be coupled to the input shaft ( 8 ) of the first sub-transmission ( 6 ) and, if the separating clutch ( 11 ) is locked, is coupled to the same element ( 15 ) of the planetary transmission ( 10 ) together with the input shaft ( 8 ) of the first sub-transmission ( 6 ), and whereas a positive-locking or frictional-locking bypass shift element ( 12 ) works together with the planetary transmission ( 10 ) in such a manner that, with a locked bypass shift element ( 12 ), a torque-proof connection between the electric motor ( 2 ), the input shaft ( 8 ) of the first sub-transmission ( 6 ) and the input shaft ( 9 ) of the second sub-transmission ( 7 ) and thus a mandatory equality of rotational speed between the same, exist, while, with an open bypass shift element ( 12 ), this torque-proof connection between the electric motor ( 2 ) and the two input shafts ( 8 , 9 ) of the two sub-transmissions ( 6 , 7 ), and thus the mandatory equality of rotational speed, do not exist, characterized in that, for the execution of a power shift, shortly prior to the engagement of a positive-locking shift element to be locked for the power shift, the frictional-locking separating clutch ( 11 ) is brought into slip for the decoupling of the inertial mass of the internal combustion engine ( 1 ).