Coolant temperature adjustment system for internal combustion engine temporarily increases coolant pump revolution rate if abrupt coolant temperature demand value changes occur

摘要

The method involves regulating the coolant pump (3) speed and the bypass valve (4) position depending on the coolant temperature at the output of the internal combustion engine. The difference between the coolant temperatures at the output and input of the internal combustion engine is measured and the system temporarily increases the revolution rate of the coolant pump when abrupt changes occur in the demand value for the coolant temperature.