Patent ID: 6817321
Filing Date: 2004-11-16
Classification: F01P

Abstract:
A control method for an electronic control thermostat in an automobile engine cooling water temperature control system in which the temperature of cooling water is set variably by an electronic control thermostat in accordance with the engine load, characterized in that parameters from a variety of sensor types which detect the state of the engine are inputted into an engine control unit, and when said engine control unit determines from the values of the parameters indicating the operative state of the automobile that the engine load is about to decrease, control is switched in said electronic control thermostat to a control method in which a target water temperature for controlling said cooling water temperature is maintained at a fixed high temperature at all times, and when said engine control unit determines that medium or high loads are due to increase, control is switched in said electronic control thermostat to a control method in which a target temperature corresponding to said parameter values is read from said engine control unit.