Cooling system for cooling driving motor of hybrid vehicle and method for controlling the same

摘要

The present invention relates to a cooling system for cooling a driving motor of a hybrid vehicle and a method for controlling the same which supplies suitable cooling flow according to temperature and temperature change rate of the driving motor. An exemplary embodiment may include: an electric oil pump to generate hydraulic pressure for cooling the driving motor; a switching valve to selectively transmit the hydraulic pressure to the driving motor; a solenoid valve to selectively supply control pressure to the switching valve so as to switch hydraulic lines in the switching valve; and a control portion controlling operations of the electric oil pump and the switching valve, wherein the control portion operates the electric oil pump by various operation amounts or stops the electric oil pump according to temperature of the driving motor and temperature change rate of the driving motor, and turns on or off the solenoid valve.

主权项

1. A cooling system for cooling a driving motor of a hybrid vehicle, comprising:
an electric oil pump that generates hydraulic pressure for cooling the driving motor of the hybrid vehicle; a switching valve that selectively transmits the hydraulic pressure generated by the electric oil pump to the driving motor; a solenoid valve that selectively supplies control pressure to the switching valve so as to switch hydraulic lines in the switching valve; and a control portion that controls operations of the electric oil pump and the switching valve, wherein the control portion is configured to:
operate the electric oil pump by first, second, and third operation amounts,stop the electric oil pump according to temperature of the driving motor and temperature change rate operating region of the driving motor, andturns on or off the solenoid valve when the temperature change rate of the driving motor is within a first predetermined operating region in relation to time and temperature of the driving motor, wherein the control portion is further configured to
operate the electric oil pump:
by i.) the second operation amount and turns on the solenoid valve when the temperature change rate of the driving motor falls within a second predetermined operating region and the temperature of the driving motor is greater than or equal to a reference temperature,by ii.) the third operation amount and turn on the solenoid valve when the temperature change rate of the driving motor is within a third predetermined operating region and the temperature of the driving motor is greater than or equal to the reference temperature, andby iii.) turn off the electric oil pump and the solenoid valve when the temperature change rate of the driving motor is within a fourth predetermined operating region, or the temperature change rate of the driving motor is within the third predetermined operating region and the temperature of the driving motor is less than the reference temperature.