METHOD OF CONTROLLING A VARIABLE SPEED FAN

摘要

Various control strategies and techniques (28) for controlling a variable speed fan (18) in an internal combustion engine (12) are provided. The vario us control techniques improve fuel economy by operating the fan at a speed sufficient to cool the engine, while avoiding unnecessarily higher speeds th at result in poor fuel economy. Further, the fan may be completely disabled at cold start up to avoid over cooling, particularly in an engine using a charg e air cooling system.