| 摘要 |
<p>The present invention relates to a device for controlling the speed of a cooling fan in a construction machine according to the temperature of exhaust gas and more specifically, to a device for controlling the speed of the cooling fan in a construction machine in order to control the cooling fan which cools various kinds of fluids, comprising: a temperature sensor for detecting the temperature of exhaust gas at the front end of an exhaust gas post-treatment device; a control unit which determines whether the exhaust gas temperature which is detected by the temperature sensor is in a over-heating or over-cooling range, and which outputs cooling fan speed data that are different from each other according to the determined results; and a fan-driving means which drives the cooling fan according to the cooling fan speed data outputted from the control unit. If the temperature of the exhaust gas at the front end of the exhaust gas post-treatment device is detected as being low, the speed of the cooling fan is lowered so as to reduce fan-driving power, thereby assisting the fuel ratio improvement of an engine.</p> |
