COOLING DEVICE FOR INTERNAL COMBUSTION ENGINE, AND COOLING METHOD FOR INTERNAL COMBUSTION ENGINE

摘要

Provided are: a three-way valve (12) provided on an outlet side of a cooling-water flow path (L1), and configured to branch the cooling-water flow path (L1) into a heat-exchanging flow path (L3) having a heat exchanger (14) for cooling of cooling water disposed therein, and a bypass flow path (L2); a first temperature detecting unit (21) that detects an inlet temperature of the cooling water supplied to the heat exchanger (14); a second temperature detecting unit (22) that detects an outlet temperature; and a control unit (23) that controls distribution of the volume of flow of the cooling water output from the three-way valve (12). The control unit (23) stores a correlation between a temperature difference ”T between an inlet temperature and an outlet temperature of the heat exchanger (14), and the amount of thermal deformation occurring in the heat exchanger (14). At the time when the cooling water is supplied to the heat-exchanging flow path (L3), the control unit (23) refers to the temperature difference ”T and the correlation to obtain the volume of flow of the cooling water supplied to the heat-exchanging flow path (L3) so that the amount of thermal deformation is less than or equal to a threshold amount of thermal deformation set in advance.