| 摘要 |
<p>A control loop (40) such as an electro-pneumatic control loop or other logicalprocess, having a lead ilag filter (20) connected to the input thereof inparticular, a reference control signal (10), such as a 4-2OmA set point signalor control signal generated by a process controller or user interface, is appliedto the input of the lead-lag input filter (20) which operates on the referencesignal (which can be a set point or other control signal to provide a filtered output50 (also called a travel set point signal) to a summer (30) associated with theelectro-pneumatic control loop (40), the summer (30) compares the valve travelwith the travel set point signal (50) to generate an error signal, which is providedto an amplifier or gain unit (90) (called a forward path gain unit) which appliesa gain K. The output of the forward path gain unit 90 is provided to a further summer(94) which sums (in this case, subtracts) a velocity feedback gain developedby a gain unit (95) and a minor loop feedba ck gain developed by a gain unit (105)from the output of the forward path gain unit (90).</p> |
