To reduce the hysteresis over the whole working area, and to avoid chattering of a valve by forming the control quantity to control the valve of at least two control quantity components, modulating a first control quantity component by a first frequency, and modulating a second control quantity component by a second frequency.
In controlling the torque of the torque transmission system, etc., in a drive train of a vehicle using a pressure medium device 1, the pressure medium generated by a compressor 2 is guided to a torque transmission system 3 to couple/uncouple a clutch, etc., through a piping 4 and a slider valve 5. The slider valve 5 is controlled by the pressure in a pressure chamber 8 and the pressure in the axial direction by a stress accumulator 9. The pressure chamber 8 controls the pressure by a spare control valve 10 in the piping 11 connected to the discharge side of the compressor 2 and a valve 20 including the slider valve 21 to release the pressure chamber 8 to the atmosphere, and the valve 20 is controlled by control signal of the different frequency according to the running condition by a control unit 30.
| JPS54108183 | OIL PRESSURE SERVO DEVICE |
HOMM MANFRED
GENZEL MICHAEL
TELEFUNKEN MICROELECTRON
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