Vehicle drive device

摘要

In a vehicle drive device, a response to a range change request, during which the drive wheels are rotated in a low or high range, can be smoothly and quickly completed without using a synchronous engaging mechanism. When the range change is requested when the drive wheels are rotated in the low range or in the high range, the control devices disengage a clutch sleeve from a currently engaged gear piece so as to establish a neutral range, and control an output rotational speed of the motor generator such that a difference between an input rotational speed and an output rotational speed of the transmission mechanism is set to be zero, or be equal to or less than a predetermined value. After that, the control devices cause a connection processor to slide the clutch sleeve to be connected to a connection target gear piece.

主权项

1. A vehicle drive device including a transmission mechanism selectively establishing one of a low range and a high range and power-transmissively connecting an output shaft to drive wheels, a range changing mechanism changing the range of the transmission mechanism, a motor generator inputting drive force to the transmission mechanism, and a control device controlling the changing of the range,
wherein the range changing mechanism includes:
a low gear piece and a high gear piece that are arranged and spaced apart from each other in an axial direction;a clutch sleeve that is slidably arranged in the axial direction so as to be engaged with one of the two gear pieces and that is integrally rotatably connected to the output shaft of the transmission mechanism; anda shift actuator that slides the clutch sleeve either forward or backward in the axial direction to be connected to one of the gear pieces, and when the clutch sleeve is connected to the low gear piece, a low-range power transfer path is established, and when the clutch sleeve is connected to the high gear piece, a high-range power transfer path is established, wherein the control device includes:
a disengage processor that disengages the clutch sleeve from the currently engaged gear piece so as to establish a neutral range in response to a range change request in a state in which the drive wheels are rotated in the low range or in the high range;a rotation synchronization processor that controls an output rotational speed of the motor generator in the neutral range such that a difference between an input rotational speed and an output rotational speed of the transmission mechanism is set to be zero or be equal to or less than a predetermined value; anda connection processor that slides the clutch sleeve to be connected to a connection target gear piece.