Patent ID: 8950528
Filing Date: 2015-02-10
Classification: B60K,B60L,H02P,Y02T

Abstract:
1. An electric vehicle comprising: a motor unit configured to drive a wheel, the motor unit including motor coils; a control system that controls the motor unit, the control system including an inverter; a temperature sensor that is associated with the motor coils of the motor unit and is configured to sense temperature Tmc of the motor coils or a temperature sensor that is associated with the inverter and is configured to sense temperature Tic of the inverter; and a limiter configured to, if the temperature Tmc sensed by the temperature sensor is equal to or greater than a motor coils temperature threshold, reduce a motor current of the motor unit until a derivative dTmc/dt of the sensed temperature Tmc with time t drops to zero or below, or to, if the temperature Tic sensed by the temperature sensor is equal to or greater than an inverter temperature threshold, limit a current command to the inverter until a derivative dTic/dt of the sensed temperature Tic with time t drops to zero or below, the limiter being further configured to, when the dTmc/dt or dTic/dt drops to zero or below, stop reducing a motor current of the motor or limiting the current command to the inverter.