EP 0597657 A1 19940518 - Piston and cylinder assembly control system.

Title (en)

Piston and cylinder assembly control system.

Title (de)

Steuereinrichtung für eine Kolben-/Zylinderanordnung.

Title (fr)

Système de contrÔle pour ensemble piston et cylindre.

Publication

EP 0597657 A1 19940518 (EN)

Application

EP 93308912 A 19931108

Priority

GB 9223827 A 19921113

Abstract (en)

A piston and cylinder assembly control system is described which includes a piston (16a; 18a) reciprocating in a cylinder (16b; 18b) and connected to a part (12; 14) to be driven by the piston and cylinder assembly, a position sensor (34; 36) arranged to provide signals indicative of the position of the piston in the cylinder, a valve (20; 22) for controlling fluid flow to and from the cylinder, and a control unit (28). The control unit is arranged to: (i) receive the position dependent signals, (ii) determine the actual current speed of the piston in the cylinder, (iii) determine the maximum permitted speed of the piston at the current position from a predetermined relationship between maximum piston speed and current piston position, (iv) compare the maximum permitted speed with the actual speed, and (v) generate valve control signals to control the fluid flow to and from the cylinder such that the maximum permitted piston speed is never exceeded. The piston and cylinder assembly may be double acting or single acting. If double acting it may comprise a double acting ram or two single acting rams. <IMAGE>

IPC 1-7

F15B 11/04; G05D 3/14

IPC 8 full level

F15B 11/048 (2006.01)

CPC (source: EP)

F15B 11/048 (2013.01); F15B 2211/30525 (2013.01); F15B 2211/327 (2013.01); F15B 2211/35 (2013.01); F15B 2211/6336 (2013.01); F15B 2211/6346 (2013.01); F15B 2211/6654 (2013.01); F15B 2211/7052 (2013.01); F15B 2211/7053 (2013.01); F15B 2211/71 (2013.01); F15B 2211/75 (2013.01); F15B 2211/755 (2013.01)

Citation (search report)

[DY] EP 0022105 A1 19810107 - AKERMANS VERKSTAD AB [SE]
[Y] DE 2261514 A1 19730620 - RANK ORGANISATION LTD
[A] WO 8704220 A1 19870716 - AKERMANS VERKSTAD AB [SE]
[A] FR 2125982 A5 19720929 - RANK ORGANISATION LTD
[A] FR 2565638 A1 19851213 - NIPPON JOUCOMATIC CO LTD [JP]

Designated contracting state (EPC)

AT DE FR GB

DOCDB simple family (publication)

GB 2272541 A 19940518; GB 9322831 D0 19931222; EP 0597657 A1 19940518; GB 9223827 D0 19930106

DOCDB simple family (application)

GB 9322831 A 19931105; EP 93308912 A 19931108; GB 9223827 A 19921113