Patent ID: 11884259
Assignee: NINGBO GEELY AUTOMOBILE RESEARCH & DEVELOPMENT CO., LTD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC B  F  Y | IPC B  F

Claim 0:
1. A method for performing rotational speed synchronisation of a first transmission component having a first initial rotational speed with a second transmission component having a second initial rotational speed, so that they rotate with the same final rotational speed during a gear switch from an initial driving gear to a final driving gear in a stepped gear transmission for a hybrid electric or electric drive train having an electric traction motor, the method comprising:
calculating a first time period for performing the total rotational speed synchronisation by means of the electric traction motor only;
calculating a second time period for performing the total rotational speed synchronisation by means of a mechanical synchroniser of the stepped gear transmission only;
determining whether the first synchronisation time period exceeds the second synchronisation time period or if the first synchronisation time period exceeds the second synchronisation time period more than 25%; and
performing the synchronisation by means of only the electric traction motor if the first synchronisation time period does not exceed the second synchronisation time period or if the first synchronisation time period does not exceed the second synchronisation time period more than 25%.