From the "Mini Air Cooling Fan" forms of work, the cooling fan control has three kinds: one is applicable to mechanical drive control large vehicles and heavy vehicles; - nothing to do with the engine ECU, monitoring environmental parameters alone automation electric control; Third, integrated intelligent control synthesis engine, air conditioners, compressors, vehicle speed and other parameter information. The former is the use of a mechanical transmission principle. Or directly driven by the engine crankshaft, or the cooling fan driven by the engine belt; the latter two only reflects the true sense of the engine cooling fan control technology.