"Mini Air Cooling Fan" can let the car at high temperature working environment must be appropriate cooling, to keep it at suitable temperatures, in order to meet the requirements of a good engine performance, durability and emissions. Engine cooling system plays a key role in this. The control of the engine cooling system, is the main cooling fan control technology. At the lowest cost, lowest power consumption, it is best to complete the task of cooling the engine cooling system, cooling fan control technology research worthy of further analysis.