CONTROLLER FOR ELECTRIC VEHICLE

摘要

PURPOSE:To sustain operation, while ensuring brake force, even upon failure of any one inverter by providing each induction motor with one inverter. CONSTITUTION:Upon failure of a VVVF inverter 31, a switch 141 for feeding DC power to the inverter 31 is opened thus isolating only the inverter 31 and remaining sound inverters 32-34 sustain operation. Upon provision of a brake command, the inverter 31 produces zero regenerative brake force because it is isolated and does not function whereas regenerative brake force operating sections 102-104 for other sound inverters 32-34 normally operate regenerative brake forces. An average value operating section 15 operates an average regenerative brake force of the inverters 31-34 and a subtractor 11 determines deficiency of regenerative brake force which is then converted into pneumatic brake force to be applied.