To provide a cooling device of an internal combustion engine that prevents boiling of a coolant circulating through an exhaust manifold.
An engine cooling system 1 includes: a coolant circulation channel 22 which circulates the coolant through a water jacket 111 installed on the exhaust manifold 110; and a bypass channel 23 which branches from the coolant circulation channel 22 to bypass the water jacket 111. In addition, the system predicts a temperature variation of a heat-exchanging part between the coolant and the water jacket 111 on the basis of an engine output and an amount of the coolant (Wt) circulating through the water jacket 111 (Ti); and determines the necessity of increase of the amount of the coolant circulating through the water jacket 111 from the predicted result. When it is determined that the amount of the coolant needs to be increased, a control valve 24 installed on the bypass channel 23 is closed to shut off a communication, Wt is increased, and which thus prevents boiling of the coolant circulating through the exhaust manifold 110.
MITANI SHINICHI
HOSHI KOICHI
SHINODA SACHIHISA
TOYOTA MOTOR CORP
Toshiyuki Hatta
High Yoshitaka Hayashi