Patent ID: 6114828
Filing Date: 2000-09-05
Classification: B60L,H02H,H02P,Y02T

Abstract:
A control apparatus for an electric vehicle, comprising:a motor drive, having a plurality of arms and each arm including a series-connected semiconductor switching device pair, for switching a voltage applied across each switching device of the corresponding one of the switching device pairs from a DC power supply so as to apply an AC power having a plurality of phases of the same number of the arms to the motor, the vehicle being driven by means of the motor;a sensor for detecting a rotation velocity of the motor;a torque demand instruction value determinator for determining a value of a torque demand instruction that a vehicle driver has demanded;a locked state determinator for determining whether the electric vehicle falls in a locked state on the basis of the detected rotation velocity of the motor and the determined torque demand instruction value;a motor drive controller for controlling switching operations of the respective pairs of the switching devices in the motor drive for the respective switching pairs of the motor drive to supply respective phase currents to the motor so as to regulate an output torque of the motor according to the torque demand instruction value; anda torque reducer for outputting a command to the motor drive controller to reduce the output torque of the motor so as to change a present phase domain of the motor to another phase domain when the locked state determinator determines that the electric vehicle has fallen in the locked state.