Patent ID: 7467697
Filing Date: 2008-12-23
Classification: F02B,F16D

Abstract:
1. A method for controlling a plurality of accessories associated with a multiple cylinder internal combustion engine, the accessories coupled to an engine crankshaft by an electromagnetic coupling device with a flowable magnetic material disposed between a driving member and a driven member, the method comprising: monitoring at least one operating condition to determine whether to simultaneously engage or disengage the plurality of engine accessories while the engine is running: decreasing power to the electromagnetic coupling device over a first time period when disengagement is determined in response to the at least one operating condition to simultaneously disengage the plurality of engine accessories; and increasing power to the electromagnetic coupling device over a second time period when engagement is determined in response to the at least one operating condition to simultaneously engage the plurality of engine accessories; wherein the second time period is longer than the first time period to provide a rapid disengagement and smooth engagement of the plurality of accessories.