Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Patent
1987-12-11
1989-05-02
Garrett, Robert E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
91459, 13762525, F15B 1316
Patent
active
048257494
ABSTRACT:
The object of the invention is to improve the position and feed or advance regulation of a hydraulic drive which is controlled by a proportional valve. In a first compensation circuit the flow characteristic of the proportional valve is linearized to obtain very small feed rates and a high control amplification. In a second compensation circuit the positioning error of the drive arising from the necessary overlapping of the proportional valve is compensated.
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Steuerungs Und Regelungstechnik, Morlok et al, "Erweiterte Einsatzmoglichkeitern von Proportionalventilen", 1985, pp. 80-84, 87.
Servo Und Proportionaltechnik, Edelmann, "Schnelle Proportionalventile Und ihre Anwendung", 1986, pp. 35-40.
Garrett Robert E.
Mannesmann Rexroth GmbH
Williamson M.
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