CONTROLLER OF DRIVE DEVICE FOR VEHICLE

摘要

A controller enabling a reduction in the size of a differential mechanism and an increase in fuel economy and capable of preventing busy shift from occurring in a drive device having the differential mechanism and a transmission. The drive device comprises a changeover clutch (C0) or a changeover brake (B0) to changeover the transmission mechanism (10) between a continuously variable transmission state and a stepped transmission state to provide both advantages of the improvement of the fuel consumption of the transmission with electrically changeable gear ratio and the high transmitting efficiency of a gear type transmission device mechanically transmitting a power. Also, if a necessary drive force or a drive force source braking cannot be obtained when an overall gear ratio ?T is set to a lower vehicle speed side than that in a prescribed traveling or the load torque of a motor is not within an allowable range, a differential part (11) is changed over to the stepped transmission state by a changeover control means (50). As a result, the drive force or the drive source braking larger than that in the prescribed traveling can be provided without allowing the load torque of the motor to exceed an allowable range and the busy shift can be prevented from occurring.