| 摘要 |
A cooling system for a water-cooled vehicle engine has a radiator through which cooling water flows and which can be exposed to cooling air by an electric fan (9). A first heat sensor (F1) on the engine block senses the water outflow temperature, while a second heat sensor (F2) senses the radiator outflow temperature. The sensed values from both sensors are fed to an electronic control unit (11) which also stores temperature threshold values for both sensor, at which certain functions have to be performed. In the event of failure of either sensor, the electronic control unit (11) takes over the function of the sensor: from the temperature value sensed by the other sensor a temperature equivalent value is formed by adding or subtracting the temperature difference which exists between the two sensors at running temperature. The control unit then activates the appropriate function if the relevant threshold value is reached or exceeded. |
