Cooling device for internal combustion engine of vehicle and control method thereof

A method for controlling a cooling device for an internal combustion engine of a vehicle, the cooling device including an electric water pump for circulating cooling water through the internal combustion engine of the vehicle, the control method comprising:

• acquiring a signal related to a temperature of the cooling water from a water temperature sensor configured to measure a temperature of the cooling water at a cooling water outlet provided to the internal combustion engine;
• acquiring a signal related to a temperature of a combustion chamber wall of the internal combustion engine from the combustion chamber wall temperature sensor disposed on the combustion chamber wall and configured to measure the temperature of the combustion chamber wall;
• comparing the temperature of the cooling water measured by the water temperature sensor with a warm-up completion determination temperature;
• performing first pump control of increasing a discharge flow rate of the electric water pump in accordance with an increase of the temperature of the cooling water measured by the water temperature sensor, when the temperature of the cooling water measured by the water temperature sensor is below the warm-up completion determination temperature;
• shifting from the first pump control to second pump control of controlling the discharge flow rate of the electric water pump by comparing the temperature of the combustion chamber wall measured by the combustion chamber wall temperature sensor with a target temperature so as to bring the temperature of the combustion chamber wall toward the target temperature, when the temperature of the cooling water measured by the water temperature sensor is above the warm-up completion determination temperature, and
• changing the target temperature of the combustion chamber wall in the second pump control in accordance with the temperature of the cooling water measured by the water temperature sensor.