| 摘要 |
PROBLEM TO BE SOLVED: To provide a control method for an electrically controlled thermostat which makes a proper and efficient control of the cooling water temperature in accordance with the load of a car engine, whereby to establish excellent responsiveness and stability, to prevent generation of overshoot, hunting, etc., and to enhance the fuel economy of the car to a higher degree. SOLUTION: To control the cooling water temperature of the engine from a first set value (high) to a second set value lying lower than the first, or vice versa, the radiation amount of a radiator when the operation is stabilized at the low or high set value is predicted without sensing the cooling water temperature so that no temperature hunting is generated, and the control of the water temperature is conducted by controlling the electronically controlled thermostat in accordance with the predicted value. Even during this water temperature control, corrections for the heat emission from the engine, the revolving speed of a water pump, the water temperature of the radiator outlet side, and also a valve non-linearity are made. COPYRIGHT: (C)2003,JPO
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