EP 2149715 A3 20121107 - Position detection device for a fluid cylinder
Title (en)
Position detection device for a fluid cylinder
Title (de)
Positionsmessvorrichtung für einen fluidischen Zylinder
Title (fr)
Dispositif de détection de position pour un vérin fluidique
Publication
Application
Priority
DE 202008010230 U 20080731
Abstract (en)
[origin: EP2149715A2] The device has an evaluation unit for determining the position of a piston rod (2) of a fluidic cylinder with respect to a cylinder barrel (1) of the fluidic cylinder based on intrinsic capacitance of a condenser formed from the cylinder barrel, the piston rod and a dielectric fluid operating as a dielectric. The piston rod is guided into the cylinder barrel in a longitudinally movable manner. The evaluation unit determines the capacitance over an oscillator circuit e.g. Martin-oscillator, with frequency evaluation that takes place in a digital manner.
IPC 8 full level
F15B 15/28 (2006.01); G01M 99/00 (2011.01)
CPC (source: EP US)
F15B 15/2853 (2013.01 - EP US)
Citation (search report)
- [XI] DE 3518858 A1 19851128 - NISSAN MOTOR [JP]
- [XI] EP 0358366 A2 19900314 - ATSUGI MOTOR PARTS CO LTD [JP]
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA RS
DOCDB simple family (publication)
DE 202008010230 U1 20091210; EP 2149715 A2 20100203; EP 2149715 A3 20121107; EP 2149715 B1 20170607; US 2010089144 A1 20100415; US 8117908 B2 20120221
DOCDB simple family (application)
DE 202008010230 U 20080731; EP 09008292 A 20090624; US 51288209 A 20090730