| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic device which reduces an error caused in rod displacement by deformation of a cylinder tube, and to provide a hydraulic system, a control method of the hydraulic device, and a control method of the hydraulic system.SOLUTION: A hydraulic cylinder 200 includes: a cylinder tube 230; a piston 240; a piston rod 210; a built-in rod displacement detector 300 which detects displacement from an end surface 220a of a rod cover 220 to an end surface 210a of the piston rod 210; a pressure sensor 510 which detects an internal pressure of the cylinder tube 230; and an operation part 500 which corrects an error caused by deformation of the cylinder tube 230 on the basis of the output of the built-in rod displacement detector 300 and the output of the pressure sensor 510. |
