ELECTROMAGNETIC CLUTCH
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United States of America Patent
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Issued Date -
May 21, 2015
app pub date -
Nov 12, 2014
filing date -
Nov 20, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A torque transfer device for a motor vehicle includes a clutch for transferring torque between first and second shafts. An electromagnetic actuator includes an axially moveable armature for applying an application force to the clutch. An actuator control system includes a force sensor positioned within a clutch actuation force load path and is operable to output a signal indicative of a force applied to the clutch. The control system includes a controller operable to control the electromagnetic actuator to vary the force applied to the clutch based on the force sensor signal. As an option, the actuator control system can include a position sensor operable to output a signal indicative of a position of the armature. The control system determines a target torque to be transferred by the clutch and a target armature position based on a previously determined clutch torque vs. armature position relationship. The control system varies an electrical input to the electromagnetic actuator to perform closed loop control of the armature position.
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