From the "Mini Air Cooling Fan" cooling fan drive control module, the cooling fan control technology can be divided into two categories, one is focused on centralized control system of the engine power control module; the second is independent of the engine or outside engine has communication links remote control. Centralized control, referring to the cooling fan control executed by the engine powertrain control module both engine fuel injection, ignition, emissions, air conditioning, cooling fan and other control functions. By its unified and coordinated scheduling, to guarantee a good engine power, economy, emissions. Remote control, meaning that out of the engine, by an external electronic control module to complete the drive fans to the engine cooling system to achieve appropriate cooling purposes. This external electronic control module is what we call the engine cooling fan controller.