Patent ID: 7966978

Claim:
A cooling control unit for a water-cooled multi-cylinder internal combustion engine having a cylinder deactivation mechanism including a deactivation-programmed cylinder and a normally activated cylinder so as to partially deactivate the cylinders in accordance with the state of engine operation, the cooling control unit comprising: a communicating passage through which a normally activated cylinder coolant jacket and a deactivation-programmed cylinder coolant jacket communicate with each other, and through which a coolant flows between the jackets, the normally activated cylinder coolant jacket being a coolant passage formed for the normally activated cylinders, and the deactivation-programmed cylinder coolant jacket being a coolant passage formed for the deactivation-programmed cylinders; a bypass passage which diverges from the communicating passage, and which bypasses the deactivation-programmed cylinder coolant jacket; a diversion control valve provided to a diversion section where the bypass passage diverges from the communicating passage; and control means for controlling the diversion control valve in accordance with the operating state of the internal combustion engine.