Apparatus and method for preventing overload on switching device in inverter circuit for motor applicable to electric vehicle

摘要

In control apparatus and method for an electric vehicle, when the motor is determined to be locked during a run of the vehicle on an ascending slope, a limitation torque r of the motor as a function of a maximum value T.sub.JMAX of estimated junction temperatures of respective switching devices of an inverter circuit is determined, an output torque L for the motor to be escaped from the locked state is calculated as L=-, wherein denotes a displacement torque, =+A when r c and a phase domain of the motor determined on the basis of a magnetic pole position is the same as the previous one and . DELTA.=0 when rc and the phase domain is not the same as the previous one.