Patent ID: 8727053
Filing Date: 2014-05-20
Classification: B60K,B60L,B60W,B60Y,Y02T,Y10T

Abstract:
1. A vehicle comprising: two electric motors configured to output driving forces to right and left drive shafts independently, respectively; two planetary gear reducers disposed on a power transmission paths path between the right drive shafts shaft and a first electric motors motor of the two electric motors and on a power transmission path between the left drive shaft and a second electric motor of the two electric motors, respectively, wherein a first rotation element of one of the planetary gear reducers and a first rotation element of the other planetary gear reducer are connected to each other; a one-way power transmitting device disposed between first rotation elements connected to each other of the planetary gear reducers and a reducer case that accommodates the planetary gear reducers therein so as to transmit one-way rotational power; a brake that connects/disconnects the first rotation elements connected to each other and the reducer case, and configured to transmit two-way rotational powers of the electric motors to the drive shafts in a connection state; a running state estimator which estimates a running state of the vehicle; a torque calculator which calculates torques of the two electric motors; and a controller which controls the brake based on the running state of the vehicle estimated by the running state estimator, and wherein: when the vehicle runs forward and both the two electric motors power the vehicle, the controller releases the brake, when the vehicle runs forward and both the two electric motors perform regenerative braking, the controller actuates the brake, when the vehicle runs forward and one of the two electric motors powers the vehicle while the other motor performs regenerative braking, the controller releases or actuates the brake based on a power driving torque of said one of the two electric motors that powers the vehicle and a regenerative braking torque of the other motor that performs regenerative braking, and when one of the two electric motors powers the vehicle and the other motor performs regenerative braking and the regenerative braking torque is larger than the power driving torque, the controller actuates the brake.