Cooling system

A cooling system comprising:

• an electric pump configured to pump a coolant to a circulation channel connected to an inlet and an outlet of a cooling channel in which heat is exchanged with a cooling target;
• a cooling target temperature sensor configured to detect a cooling target temperature that is a temperature of the cooling target (Tw);
• a coolant temperature sensor arranged upstream of the inlet in the circulation channel and configured to detect a coolant temperature that is a temperature of the coolant (Tf);
• and
• an electronic control unit configured to control driving of the electric pump such that a discharge flow rate of the electric pump matches a target flow rate,
• wherein the electronic control unit is configured to set the target flow rate (Q*) by using the following equation based on a reference value (B) obtained by dividing a difference between the cooling target temperature detected by the cooling target temperature sensor and a target cooling temperature of the cooling target by a difference between the cooling target temperature detected by the cooling target temperature sensor and the coolant temperature detected by the coolant temperature sensor, and multiplying the reference value by a value obtained by dividing a predetermined conversion constant (K) by a predetermined time constant (t):
• B=(Tw−T*)/Tw−Tf)
• Q*=B×K/t.