Control system for a fluid pressure engaged clutch.

摘要

Fluid pressure for engagement of a clutch (14) is controlled by valve means (15) alternating between supply and drain conditions in response to a high frequency electrical square wave signal. The valve means (15) produce a low flow pilot pressure signal which controls clutch engagement pressure through a valve 16 incorporating a piston 17 which allows clutch engagement pressure to drain whenever that pressure exceeds pilot pressure.