FIELD: physics; control.
SUBSTANCE: invention relates to servocontrollers for use in logic circuits or control loops and specifically to extensions of electro-pneumatic control loops and other logic circuits for improving function of control valves and accessories of pneumatic drives. A lead-lag input filter is connected ahead of a positioner feedback loop having one or more valve accessories, such as a volume booster or a quick exhaust valve, to overcome slow dynamics experienced by the accessories when receiving low amplitude change control or set point signals. A user interface is connected to the lead-lag input filter and enables an operator or other control personnel to view and change operating characteristics of the lead-lag input filter to provide the control loop with any of a number of desired response characteristics.
EFFECT: overcoming slow dynamics experienced by valve accessories; enabling an operator to view and change operating characteristics of the lead-lag input filter; possibility of controlling such process parametres as displacement or rod stroke of a valve; possibility of accurate setup.
42 cl, 7 dwg
