Patent ID: 7663336

Claim:
A control apparatus for a vehicle having an electric motor to drive wheels of the vehicle and an electric power supply to energize the electric motor, comprising a controller which temporarily decreases a field current of the motor when the difference between the actual motor armature current and the motor armature current target value exceeds a predetermined value, and which increases the field current of the motor when the difference between the actual armature current of the motor and the motor armature current target value does not exceed the predetermined value, wherein the controller further comprises a field current target value calculation means, wherein the field current target value calculation means comprises a motor current target value calculation means that comprises plural means for outputting different target values for the motor field current, a motor field current control mode judgment means, and a motor field current target value switching means, and wherein the motor field current target value switching means selectively outputs one of the different target values in accordance with the judgment result obtained by the motor field current control mode judgment means.