Valve device for controling hydraulic pressure for clutch or brake has pressure switch that detects initial engagement pressure if clutch or brake cylinder chamber filled with fluid

摘要

The device has a pressure control valve (30), a pilot fluid channel (19), a proportional pressure valve (50), a proportional solenoid (40) and a pressure switch (60). The pressure switch is connected to an outlet opening (13) of the pressure control valve and detects the initial engagement pressure of the clutch or brake if the clutch or brake cylinder chamber is filled with fluid. Independent claims are also included for the following: a method of controling a hydraulic pressure for a clutch or brake.