Patent ID: 6636008
Filing Date: 2003-10-21
Classification: H02P

Abstract:
An electric car controller which provides dq-axis vector current control for separate and independent control of primary current to be supplied to a stator of an alternating current motor based on a q-axis control current command value and a d-axis control current command value, and which provides current feedback control by detecting the primary current of said alternating current motor by current detecting means:said controller comprising; an operation processing unit for generating a control current command value based on a command value to supply it to said alternating current motor and for performing current feedback control through detection by said current detecting means and conversion by current converting means, and an evaluation processing unit for generating a current command value for evaluation and performing evaluation to see if said current detecting means is normal or not: said evaluation processing unit characterized by comprising; a step of generating an evaluation current command value for comparison and evaluation unaffected by said current feedback and independently of said control current command value, based on said q-axis control current command value and said d-axis control current command value using command value converting means, a step of comparing between an alternating current detected value detected by said current detecting means without being converted by said current converting means and said evaluation current command value, and a step of determining that said current detecting means is incorrect if the result of comparison has exceeded a threshold value.