April 2009
Intermediate to advanced
352 pages
8h 52m
English
Content preview from Process Identification and PID ControlBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
1
Mathematical Representations of Linear Processes
1.1 Introduction to Process Control and Identification
The basic concepts and terms of process control and identification are first introduced.
1.1.1 Process Control
Process control consists of manipulating variables, controlled variables and processes. The manipulating variables and the controlled variables usually correspond to the process inputs and the process outputs respectively. The objective of process control is to make the process outputs (controlled variables) behave in a desired way by adjusting the process inputs (manipulating variables). Consider the temperature control system in Figure 1.1.
The SCR unit is to provide electrical power to the heating coil, which is proportional to the voltage u(t). The temperature is measured by the thermocouple sensor. The objective of the temperature control system in Figure 1.1 is to drive the temperature y(t) to the desired value by adjusting u(t). So, u(t) and y(t) are the process input (manipulating variable) and the process output (controlled variable) respectively. The role of the feedback controller is to determine u(t) appropriately on the basis of the measured y(t) to achieve the control objective.
Example 1.1
Consider the control system in Figure 1.2. It consists of two tanks, a control valve, a DP cell and a controller. The DP cell and the control valve are to measure the liquid level of the last tank and adjust the inlet flow rate respectively. The objective of the control ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.