METHOD AND SYSTEM FOR DIAGNOSING OVER CURRENT OF OIL PUMP CONTROL UNIT OF HYBRID ELECTRIC VEHICLE

摘要

The present invention relates to an over current diagnosis method in oil pump control unit of a hybrid vehicle and a system thereof. An embodiment of the present invention relates to the over current diagnosis method of an oil pump control unit (OPU) for controlling the operation of an electric oil pump in the hybrid vehicle comprising the steps of: determining the level of current in the oil pump control unit (OPU); repeating a diagnosis process which stops the operation of an internal power device in the OPU during the set turn off time when the current of the OPU is over the predetermined current; and determining a normal condition when the current of the OPU is not over the predetermined current after repeating the diagnosis process with the predetermined numbers. [Reference numerals] (AA) START;(BB,DD) NO;(CC,EE) YES;(FF) END;(S710) Oil pump control unit (OPU) operation;(S720) OPU current > Set over current?;(S730) Executing reset count which turns off the FET of OPU during the predetermined time after counting the set time;(S740) Reset counting execution number >= set number?;(S750) OPU current > set over current?;(S760) OPU fault diagnosis determination;(S770) OPU normal diagnosis determination