DUAL CLUTCH APPLICATION AREA AND CONTROL

摘要

An adaptive clutch torque capacity control for an automotive vehicle clutch (10) utilizing a dual area apply piston (45) for engagement of the clutch plate (27) for accurate control over a larger than normal torque range. The use of two piston areas (46,48) allows one area to be controlled in a "coarse" fashion, while the other piston area, which is generally a small area, provides a "vernier" or fine adjustment control. The small area piston is controlled by an electronic closed loop (114) for fine adjustment of any errors occurring in the "coarse" control.