Electromagnetic differential speed control system for a fluid coupling device
AssigneeBorgWarner Inc.
InventorRick L. Boyer
Life of this patent
Estimating the term…
Abstract
A speed monitoring system (6) for a fluid-coupling device (10) includes a hub (44) and a ring magnet (220). The hub (44) rotates at a first speed that is proportional to an input clutch speed of a fluidically engageable input member. The ring magnet (220) rotates at a second speed that is proportional to an output clutch speed of a fluidically engageable output member. A magnetic sensor (232) generates a differential speed signal of the ring magnet (220) relative to the first speed. A controller (54) generates an actual speed signal indicative of the second speed in response to said differential speed signal.
Claims13
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.
An operational control system for a fluid-coupling device comprising:
- an input member;
- an output member fluidically engageable with and forming an operating chamber with said input member;
- a hub rotating at a first speed proportional to an input clutch speed of said input member;
- a ring magnet rotating at a second speed proportional to an output clutch speed of said output member;
- a stationary magnetic sensor and flux concentrator in operational relationship with said ring magnet and generating a differential speed signal of said ring magnet relative to said first speed;
- and
- a valve in fluid communication with said operating chamber;
- and
- a controller electrically coupled to said magnetic sensor and said valve, said controller controlling engagement of said input member with said output member in response to said differential speed signal;
- said controller generating an actual speed signal indicative of said second speed in response to said differential speed signal and controls said engagement in response thereto;
- said controller controlling fluid flow into said operating chamber in response to said differential speed signal.
A method of controlling the engagement of a fluid-coupling device comprising:
- rotating a fluidically engageable input member at an input clutch speed;
- rotating a ring magnet at a magnet rotational speed proportional to an output clutch speed of a fluidically engageable output member, said ring magnet comprising a plurality of alternating magnetic sections;
- generating a differential speed signal of said ring magnet relative to said input clutch speed by use of a stationary magnetic sensor and flux concentrator;
- generating an actual speed signal of said output member in response to said differential speed signal;
- and
- controlling engagement of said input member and said output member in response to said actual speed signal.
Dependencies are inferred from the claim text.