Fca US LLC

Niranjan Das

William R Mayhew

Steven B Christ

A hydraulic piston position determination system for a vehicle includes a hydraulic piston actuator configured to move a piston member in response to a hydraulic fluid pressure to engage/disengage a friction member, a hydraulic solenoid valve configured to control the hydraulic fluid pressure at the hydraulic piston actuator by regulating a flow of hydraulic fluid from a hydraulic fluid supply system, and a controller configured to control the hydraulic piston actuator by controlling the hydraulic solenoid valve according to an actual duty cycle based on a flow demand change associated with the hydraulic piston actuator, and determine a position of the hydraulic piston actuator based on (i) a magnetic reluctance change and (ii) a difference between the actual duty cycle and a steady-state duty cycle for the hydraulic solenoid valve.

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Ann Arbor, MI, United States of America

Niranjan Das