COOLING SYSTEM FOR INTERNAL COMBUSTION ENGINE

摘要

In order to estimate the characteristic of cooling water accurately, a cooling system for an internal combustion engine (1) is equipped with a radiator (13), a bypass passage (14) that bypasses the radiator (13), a thermostat (15), and a control device (30) that changes the temperature at which a valve opens for the thermostat (15), and is equipped with an estimation device (30) that prohibits the opening of the valve of the thermostat (15) and estimates the characteristic of the cooling water on the basis of the shift in the temperature of the cooling water at this time.