Oil Temperature Control Method, Controller, Powertrain, and Electric Vehicle

A controller, applied to an electric vehicle that comprises an oil cooling circuit, wherein the oil cooling circuit flows through a motor and an inverter, and wherein the controller comprises:

• a memory configured to store instructions;
• and
• a processor coupled to the memory and configured to execute the instructions to:
• determine an oil temperature at a detection point, wherein the detection point is a specified location in the oil cooling circuit;
• when the oil temperature is lower than a first target temperature, trigger one or more of bypassing an oil-water heat exchanger, reducing a water flow rate, or increasing a power of an oil pump;
• and
• when the oil temperature is higher than a second target temperature, trigger one or more of disabling a bypass path of the oil-water heat exchanger, increasing the water flow rate, or reducing the power.

A powertrain, comprising:

• an inverter configured to:
• convert a direct current into an alternating current;
• and
• transmit the alternating current;
• a motor configured to:
• receive the alternating current from the inverter;
• and
• convert the alternating current into mechanical energy configured to drive an
• electric vehicle;
• an oil cooling circuit;
• a water cooling circuit;
• an oil-water heat exchanger flowing through the motor and the inverter and configured to transfer heat of the oil cooling circuit to the water cooling circuit;
• an oil pump configured to pump oil through the oil cooling circuit;
• a water pump configured to pump water through the water cooling circuit;
• and
• a controller configured to:
• control a power of the oil pump;
• control a rotation speed of the water pump;
• determine an oil temperature at a detection point, wherein the detection point is a specified location in the oil cooling circuit;
• when the oil temperature is lower than a first target temperature, trigger one or more of bypassing the oil-water heat exchanger, reducing a water flow rate, or increasing the power;
• and
• when the oil temperature is higher than a second target temperature, trigger one or more of disabling a bypass path of the oil-water heat exchanger, increasing the water flow rate, or reducing the power.