Device for controlling the position of a hydraulic feed drive, s

Details Device for controlling the position of a hydraulic feed drive, s Device for controlling the position of a hydraulic feed drive, s

1988-09-23

1991-07-16

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

G05D 314

Patent

active

050315064

ABSTRACT:
The position (x) of a hydraulic press or punch press is controlled highly dynamically, by a controller which uses the velocity (v) and the acceleration (a.sub.B) of a piston. While the position (x) and the velocity (v) are sensed by customary measuring devices, the acceleration (a.sub.B) is determined by means of a sensor (B) from the pressure (p) of the hydraulic fluid and the piston velocity (v). Thereby, an expensive acceleration measurement can be dispensed with by utilizing the already existing pressure measuring arrangement. The sensor (B) can further determine an interference quantity signal (f.sub.zB) which can be fed to the control element (SG) for the purpose of generating a compensating interference signal.

REFERENCES:
patent: 3410177 (1968-11-01), Roess et al.
patent: 3487750 (1970-06-01), Borgeson
patent: 4528894 (1985-07-01), Crosby
patent: 4712470 (1987-12-01), Schmitz

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