Patent ID: 8352048

Claim:
A method for compensation of the hysteresis of a pneumatically driven fitting having an electropneumatic valve, the method comprising: driving the electropneumatic valve by a position regulator in a closed control loop for position regulation of a switching element of a pneumatic actuating drive for operation of the fitting; compensating the hysteresis of the fitting by the position regulator via at least one hysteresis correction factor, wherein the compensation for the hysteresis is carried out separately for a first basic case of starting or reversing the switching element and for a second basic case of continuous movement of the switching element, such that a dominant static friction is compensated for in the first basic case and a dominant sliding friction is compensated for in the second basic case, and the pneumatic actuating drive operates the switching element matched thereto; and determining the time between the switching element breaking loose and the start of excitation of the electropneumatic valve to measure control-loop characteristics for the first basic case.