Method and apparatus for determining clutch touch point

A method of determining a touch point position of a clutch coupling a vehicle engine with a transmission input shaft, comprising the steps of:

• moving said clutch from a disengaged position toward an engaged position at a substantially constant rate,
• detecting a first position of said clutch when the speed of said input shaft is at a first predetermined speed,
• detecting a second position of said clutch when the speed of said input shaft is at a second predetermined speed greater than said first predetermined speed,
• calculating the touch point position by subtracting from said first position an offset position equal to the distance between said first and second positions times the square root of the ratio of said first and second speeds.

A method of determining a touch point position of a clutch coupling a vehicle engine with a transmission input shaft, comprising the steps of:

• moving said clutch from a disengaged position toward an engaged position at a substantially constant rate,
• detecting and storing a first position of said clutch when the speed of said input shaft is at a first predetermined speed,
• detecting and storing a second position of said clutch when the speed of said input shaft is at a second predetermined speed greater than said first predetermined speed,
• calculating a span distance equal to the difference between said first and second position,
• calculating an offset distance equal to the product of said span distance and the square root of the ratio of said first and second speeds,
• calculating the touch point position by subtracting said offset distance from said first position.