Drive controller for vehicle

摘要

In a drive controller for a vehicle including: a drive source configured to output a drive force to a first axle serving as one of front and rear wheel axles; an electric motor configured to output a drive force to a second axle serving as the other of the front and rear wheel axles; a one-way power transmission device disposed on a power transmission pathway between the second axle and the electric motor so as to transmit a power drive force from the electric motor to the second axle; a two-way power transmission device that transmits a rotation power from the second axle to the electric motor or transmits the power drive force and a regeneration drive force from the electric motor to the second axle, the drive controller includes: a first detector that detects a speed of the vehicle or a rotation speed of the second axle; a target rotation speed determination section that determines a target rotation speed of the electric motor based on the speed of the vehicle or the rotation speed of the second axle; a second detector that detects a rotation speed of the electric motor; and a controller that controls the electric motor such that the rotation speed of the electric motor is synchronized with the target rotation speed and that controls an output torque of the electric motor or an activation of the two-way power transmission device, when the electric motor starts power drive or regeneration drive while the vehicle is traveling by the drive force from the drive source.

主权项

1. A drive controller for a vehicle, the vehicle comprising:
a drive source configured to output a drive force to a first axle serving as one of front and rear wheel axles; an electric motor configured to output a drive force to a second axle serving as the other of the front and rear wheel axles; a reducer disposed on a power transmission pathway between the second axle and the electric motor; a one-way power transmission device disposed on the power transmission pathway in series with the reducer so as to transmit a forward rotation direction torque from the electric motor to the second axle by applying a locking torque to an element of the reducer; a two-way power transmission device disposed on the power transmission pathway in parallel with the one-way power transmission device so as to transmit a reverse rotation direction torque from the electric motor to the second axle by applying a locking torque to the element of the reducer, the drive controller comprising: a first detector that detects a speed of the vehicle or a rotation speed of the second axle; a target rotation speed determination section that determines a target rotation speed of the electric motor based on the speed of the vehicle or the rotation speed of the second axle detected by the first detector; a second detector that detects a rotation speed of the electric motor; and a controller configured to: control the electric motor such that the rotation speed of the electric motor is synchronized with the target rotation speed at which the one-way power transmission device locks the element of the reducer and an output torque of the electric motor becomes a constant torque after the rotation speed of the electric motor reaches a threshold rotation speed that is lower than the target rotation speed when a drive request for the electric motor is present and the drive request is a request of the forward rotation direction torque, while the vehicle is traveling by the drive force from the drive source with the one-way power transmission device releasing the element of the reducer; and control the electric motor such that the rotation speed of the electric motor is synchronized with the target rotation speed at which the one-way power transmission device locks the element of the reducer and control the two-way power transmission device such that the two-way power transmission device is gradually activated after the rotation speed of the electric motor reaches the threshold rotation speed that is lower than the target rotation speed when the drive request for the electric motor is present but the drive request is not a request of the forward rotation direction torque, while the vehicle is traveling by the drive force from the drive source with the two-way power transmission device releasing the element of the reducer.