Patent ID: 8169177
Filing Date: 2012-05-01
Classification: B60K,B60L,B60W,H02P,Y02T

Abstract:
1. An electric vehicle including: a plurality of inverters which are connected to a plurality of motors to drive wheels and which are connected in parallel to a DC power source; judgment unit for judging whether an overcurrent is generated in one of the plurality of inverters in accordance with detected current values for the plurality of inverters; selection unit for selecting an inverter to be driven when the overcurrent is generated in one of the inverters; and inverter drive control unit for controlling the inverters, wherein, when it is judged that an overcurrent is generated in one of the plurality of inverters and a number of successive occurrences of overcurrent generation is less than a predetermined number, the inverter drive control unit stops the driving of all of the inverters to decrease a motor load factor, and then resumes the driving of all of the inverters, the motor load factor being a ratio of an allowable maximum torque command value of the motors to a generatable maximum torque of all of the motors, and when the overcurrent is generated in one of the plurality of inverters and the number of successive occurrences of overcurrent generation is the predetermined number or more, the inverter drive control unit stops the driving of all of the inverters, and then resumes the driving of only the inverter selected among the plurality of inverters to resume the driving of the motor corresponding to the selected inverter, whereby the wheels are driven.