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**Topic under **Control Mode

**Source:** academic.csuohio.edu

**File size:** **48.65 KB**

**File type:** **pdf**

**Last download on:**
Thu Apr 12, 2018 03:01:16 AM

__Short Desciption__:

The PID controller is widely used across the industry. It is ... In general, a PID controller takes as its input the error (e or. Err), or the difference

__Summary__:

Abstract- A novel Modified PID (MPID) controller is
developed to control and minimize the effect of hysteresis in
Pneumatic proportional valves. It consists of four parts: a
Proportional-Integral-Derivative (PID) controller, a
Feedforward term, an Anti-Windup mechanism, and a
Bang-Bang controller. The result is a unique Modified PID
(MPID) control scheme that demonstrates better command
following and disturbance rejection qualities than a
Conventional PID (PID + Feedforward + Antiwindup) scheme.

The control scheme is simulated based on an empirical model
derived from actual valve measurement data. The results show
that the proposed MPID controller provides better step
response, command following, and greater bandwidth than
conventional methods. Furthermore, it is demonstrated that the
robust control is achieved in the presence of significant dynamic
variations in the valve. In particular, it is shown that
satisfactory performance can be maintained when the valve
hysteresis characteristics are varied by as much as 30%.

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" Novel PID Controller for Pneumatic Proportional Valves"

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