Patent ID: 11951973
Assignee: NISSAN MOTOR CO., LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B  Y | IPC B

Claim 8:
9. A drive system of an electric vehicle comprising:
an internal combustion engine;
a generating motor provided and configured to generate electricity by receiving motive force from the internal combustion engine;
a travel motor provided and configured to be driven by electric power generated by the generating motor;
a first clutch interposed on a first motive force transmission path connecting the internal combustion engine and a drive wheel;
a second clutch interposed on a second motive force transmission path connecting the travel motor and the drive wheel, the second motive force transmission path being different from the first motive force transmission path; and
a controller, wherein the controller is configured such that:
in a series hybrid mode in which the electric vehicle travels by motive force transmitted from the travel motor to the drive wheel via the second motive force transmission path, the first clutch is disengaged while the second clutch is engaged,
in an engine direct connected mode in which at least one of the internal combustion engine and the generating motor is used as a drive power source, and the electric vehicle travels by motive force transmitted from the drive power source to the drive wheel via the first motive force transmission path, the second clutch is disengaged while the first clutch is engaged, and
at a mode switching time from the engine direct connected mode to the series hybrid mode, starting a rotation synchronization matching a rotation speed of a travel motor side of the second motive force transmission path and a rotation speed of a drive wheel side of the second motive force transmission path, and engaging the travel motor side of the second motive force transmission path and a wheel side of the second motive force transmission path by the second clutch after completing the rotation synchronization, and wherein
at the mode switching time involving deceleration, when the rotation synchronization or an engagement by the second clutch is not completed before vehicle speed is decelerated to a predetermined vehicle speed, the first clutch is disengaged before the engagement by the second clutch is completed.