| US 7,467,697 B2 | ||
| Electromagnetic coupling device for engine accessories | ||
| Larry D. Elie, Ypsilanti, Mich. (US); John M. Ginder, Plymouth, Mich. (US); Clay W. Maranville, Ypsilanti, Mich. (US); Luis Pugliese, Troy, Mich. (US); and Wallace E. Beaber, Northville, Mich. (US) | ||
| Assigned to Ford Global Technologies, LLC, Dearborn, Mich. (US) | ||
| Filed on Oct. 07, 2005, as Appl. No. 11/163,186. | ||
| Prior Publication US 2007/0080037 A1, Apr. 12, 2007 | ||
| Int. Cl. F16D 35/00 (2006.01); F16H 9/04 (2006.01) | ||
| U.S. Cl. 192—21.5 [474/70; 123/198 R] | 17 Claims |
| 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.
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