Relation Control System
A control strategy similar to ratio control is relation control. This is similar to ratio control in that a “wild”
Control Systems
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What is Ratio Control ?
Most people reading this article have likely had the experience of adjusting water temperature using two hand valves as they
Ratio Controller Example
An example of ratio control at work is in a process whereby hydrocarbon gases (usually methane) are converted into hydrogen
Cascade Control
A simple control system drawn in block diagram form looks like this: Information from the measuring device (e.g. transmitter) goes
Supervisory Control
In a manually-controlled process, a human operator directly actuates some form of final control element (usually a valve) to influence
Tuning a Temperature Process Control Loop
Tuning a Temperature Process Control Loop Ziegler-Nichols open-loop tuning procedure This next simulated process is a temperature control process. Performing
Tuning a Liquid Level Process Control Loop
Ziegler-Nichols open-loop tuning procedure The next simulated process I attempted to tune was a liquid level-control process. Performing an open-loop
Features of PID Controller actions
Purpose of each Controller action Proportional action is the “universal” control action, capable of providing at least marginal control quality
PID Tuning Recommendations based on Process Dynamics
Knowing which control actions to focus on first is a matter of characterizing the process (identifying whether it is self-regulating,
Heuristic PID Tuning Procedure
From the initial open-loop (manual output step-change) test, we could see this process contains multiple lags in addition to about