Patent ID: 8627936

Claim:
A speed monitoring system for a fluid-coupling device comprising: a hub rotating at a first speed proportional to an input clutch speed of a fluidically engageable input member; a ring magnet rotating at a second speed proportional to an output clutch speed of a fluidically engageable output member; said ring member comprising a plurality of alternating magnetic sections; a stationary magnetic sensor in operational relationship with said ring magnet and generating a differential speed signal of said ring magnet relative to said first speed; wherein said magnetic sensor comprises at least one of a hall effect sensor, a hall effect switching sensor, a latching sensor, a magnetic pick-up sensor, and an inductive sensor; a concentrator coupled to said magnetic sensor and directing magnetic flux through said magnetic sensor; and a controller electrically coupled to said magnetic sensor and generating an actual speed signal indicative of said second speed in response to said differential speed signal.