Benefit from the Phase transition point of ratio tracing the clamping force variation

one new clamping control concept is introduced

which can be obviously decrease the pressure level and the increase the efficiency. Comprehensively considered the requirement for rapidly ratio change

the pump ability and the flow

one updated proposal is raised up. Comparing with the traditional PID

this method is tested to proved not can only follow the target ratio fast and stable

but also more safe for the flow and clamping force.