20130060519 | ENCODER TO DETERMINE THE POSITION OF A PISTON IN A HYDRAULIC OR A PNEUMATIC CYLINDER - A method to determine a position of a piston reciprocating inside a hydraulic cylinder or a pneumatic cylinder between a first end position and a second end position, with the piston parting the cylinder in first and second chambers, and with at least one of the chambers at least partly filled with a fluid. The method includes the steps of driving a wheel structure of a hydraulic motor or a pneumatic motor by the force of the fluid led to or from the first or second chamber, driving a shaft encoder by the hydraulic motor or the pneumatic motor, measuring at least one parameter corresponding to a rotation or an angular displacement of the wheel structure using the shaft encoder, and calculating the position of the piston. | 03-07-2013 |