Patent ID: 7722498

Claim:
A control device for a hybrid electric vehicle, in which an internal combustion engine, a first motor-generator and a drive axle of wheels are coupled together through a power split device and a second motor-generator is coupled with the drive axle, the control device comprising: first motor-generator torque controlling means that controls a torque of the first motor-generator so that a fluctuation of variation in a rotation speed of the internal combustion engine is reduced, when the internal combustion engine is in predetermined condition, which is at least one of starting and stopping of the internal combustion engine by the torque of the first motor-generator; and second motor-generator torque controlling means that controls a torque of the second motor generator to cancel out the torque exerted on the drive axle, when the internal combustion engine is in the predetermined condition; wherein the first motor-generator torque controlling means corrects the torque of the first motor-generator variably according to a crankshaft angle of the internal combustion engine, and an amount of correction of the torque is variably determined to reduce the fluctuation of variation in the rotation speed of the internal combustion engine so that the rotation speed of the internal combustion engine changes at a substantially same rate.