Patent ID: 6923049

Claim:
A method of testing a friction component for an automatic transmission, comprising: installing the friction component in a test stand having a drive shaft and a grounding anchor with a first part of the friction component attached to the drive shaft and a second part of the friction component attached to the grounding anchor; rotating the drive shaft of the test stand with a motor drive until the drive shaft and the first part of the friction component rotate at a target sliding speed V target and continuing rotation at V target ; applying an actuation force to an actuator of the friction component at a start time (t 0 ) to stroke the actuator over a stroke time (t s ) and to apply an engagement force to the friction component at a time t 0 +t s ; continuing operation of the motor drive to maintain the speed of rotation of the drive shaft at V target for a period of time corresponding to a target torque phase time (t t ); decoupling the motor drive from the drive shaft at a time t 0 +t s +t t and allowing the rotating speed of the drive shaft and the sliding speed of the friction component to decrease in response to engagement of the friction component; and terminating the test when the sliding speed falls to zero during a time period referred to as an inertia phase (t i ).