| 摘要 |
PURPOSE:To maintain the temperature of cooling water at an optimum temperature in accordance with the driving condition by varying the control target value of the cooling water temperature in accordance with the driving condition of the engine and controlling start and stop and rotational speed of a cooling fan, the rotational speed of a water pump and the like. CONSTITUTION:By the operation of a water pump 2 cooling water is circulated in the direction shown by arrow within a radiator 8 via a cylinder block 1, a cylinder head 3, a suction manifold 4 and a heater 8. In the above device is provided a control circuit 20 supplied with output signals from a heating water temperature senser 17, a throttle valve opening senser 18 and an ignition coil 19. In this control circuit 20, in correspondence to the condition of a combination of the engine rotational speed and throttle valve opening degree, the optimum value of the control target value of the cooling water temperature stored beforehand, is read out. Then, this target value is compared with the actual cooling water temperature. When the value of the latter exceed that of the former, the transistor 21 is turned ON, and the drive motor 10 of the cooling fan 11 is rotated. |
