Patent ID: 8186967

Claim:
A fail-safe control method for an oil pump control unit of a hybrid vehicle, the method comprising the steps of: (a) determining whether an oil pump system is off due to a failure of an oil pump control unit or an electric oil pump or whether a CAN communication line of the oil pump control unit is off, when the engine of the vehicle is driven at a predetermined speed of less than a certain RPM value or stopped; (b) determining whether a hard wire is on or off, when the CAN communication line is off; (c) operating an oil pump driver by directly connecting the oil pump control unit to an automatic transmission control unit using the hard wire, when the hard wire is on in step (b), thus operating a motor of the electric oil pump; (d) controlling the oil pump driver itself by controlling the rotation speed of the motor of the electric oil pump through a motor control unit, when the hard wire is off in step (b); (e) operating the motor of the electric oil pump by controlling the rotation speed of the motor of the electric oil pump through the motor control unit, when the CAN communication line of the oil pump control unit is in a normal state and a CAN communication line of an automatic transmission control line is in a failure state at step (d); (f) operating the motor of the electric oil pump by driving the oil pump driver at a predetermined speed, when there is a failure in a CAN communication line of the oil pump driver at step (d); and (g) turning off the motor of the electric oil pump in the event of a failure of the oil pump driver or the motor of the electric oil pump, when the oil pump system is off.