Transcription of Electronically-Contolled Hydrostatic Fan Drive Systems
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Electronically-Contolled Hydrostatic Fan Drive Systems
High Performance Hydraulic Cartridge Valves October 20, 2008 and Electro-Hydraulic Control Systems Page 1 of 4. Electronically-Contolled Hydrostatic Fan Drive Systems Introduction Conventional Fan Drives In the internal combustion engine approximately 30% of the Most conventional fan Drive Systems clutch drives, pneu- energy in the fuel is converted into mechanical power while matic drives, electromagnetic and viscous drives, and vari- the rest becomes heat energy and is lost into the atmo- able pitch fans do not respond directly to engine coolant sphere around the vehicle. Of the energy converted to heat, temperature, severely limiting their accuracy and efficiency. 35 to 45% is lost directly to the surrounding atmosphere Electric fan motors may be practical for low-power applica- and the rest must be extracted from the engine block by the tions, but typically they are not a practical solution for larger cooling system.
Electronically-Contolled Hydrostatic Fan Drive Systems Variable fan speed using a variable displacement pump (Fig. 1c) is the most effi cient and offers the quietest opera-
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