Method and apparatus for determining clutch touch point

Details Method and apparatus for determining clutch touch point Method and apparatus for determining clutch touch point

G - Physics

01

M

G01M 17/00 (2006.01) G01B 7/14 (2006.01)

Patent

CA 2141016

A vehicle clutch engagement position is disclosed wherein the clutch is moved, under computer control, at a constant rate, from a disengaged position toward a fully engaged position while the transmission is in neutral gear, and the position of the clutch is detected at first and second times (T1 and T2). Time T1 corresponds to the time when the detected speed of the transmission input shaft is just above the dropout speed of the input shaft speed sensor. Time T2 corresponds to the time when the detected speed of the input shaft is close to engine speed. The position of the clutch corresponding to the incipient torque point is extrapolated by subtracting an offset amount from the position detected at time T1. The offset is equal to the change in position from T1 to T2 multiplied by the square root of the ratio of the input shaft speeds at T1 and T2.

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