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This category is for site concerned with the mathematical theory of systems and their control. In engineering and mathematics, control theory deals with the behaviour of dynamical systems over time. The desired output of a system is called the reference variable. When one or more output variables of a system need to show a certain behaviour over time, a controller tries to manipulate the inputs of the system to realize this behaviour at the output of the system. As an example, consider cruise control. In this case, the system is a car. The goal of cruise control is to keep the car at a constant speed. Here, the output variable of the system is the speed of the car. The primary means to control the speed of the car is the amount of gas being fed into the engine.

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Russian Systems and Control Archive Information about Russian specialists, groups, institutes, foundations, conferences, journals and books related to systems and control. [English, Russian] www.rusycon.ru/english/rusycon.html

Control Tutorials for Matlab Comprehensive tutorials about the control theory and its applications from the University of Michigan, USA. Addresses basics, modelling, controller design, transients and digital control, with animations and source codes. www.engin.umich.edu/group/ctm

Control Theory and Engineering Links from Theorem.Net List of resources, applets and publications. www.theorem.net/control.html

Control Tutorials for Matlab: PID Tutorial Introduction to the theory with focus on PID control. Includes background and examples with source code. www.engin.umich.edu/group/ctm/PID/PID.html

Digital Control Tutorial Explains the digital control theory and its applications in microprocessor-based controllers. Addresses z-transformation, stability and transient response. www.engin.umich.edu/group/ctm/digital/digital.html

Elements of Control Systems Comprehensive scientific article about the theory and its applications. Addresses system modelling, state-space equations, linearization, control strategies and stability criteria. www.eolss.info/eolss/47a.htm

Adjusting PID Gains Describes the adjustment procedure of PID gains. Includes transient plots. www.ctc-control.com/customer/elearning/servotut/adjus.asp

Bode and Nyquist Using Excel Explains how spreadsheets can be used to obtain Bode and Nyquist Diagrams, from the University of Michigan, USA. Includes several illustrated examples. www.chem.mtu.edu/~tbco/cm416/freqexcel.html

Classical Feedback Control with Matlab Scientific article on the closed loop control. Addresses system design, filtering, control optimization, stability, Bode and Nyquist diagrams. www.luriecontrol.com/CFC/ch4/C4.htm

Control Theory Brief introduction to the feedback theory in plain text. Addresses infinite dimension systems, active noise control, non-linear systems and related applications. www.math.uwaterloo.ca/AM_Dept/Control.Theory.html

Control Theory 101 Describes the basics of PID algorithms. Addresses proportional, integral and derivative components and their effects. www.flightgear.org/Docs/XMLAutopilot/node2.html

Design and Analysis of Control Systems Research Laboratory Department of the University of Massachusetts, USA, concerned with control research. Includes publications, research topics and contact information. www.ecs.umass.edu/mie/labs/dacs

FAQ on PID Controller Tuning Introduction to PID feedback controller. Includes mathematical background, tuning aspects, implementations and tutorials. www.tcnj.edu/~rgraham/PID-tuning.html

Feedback and Temperature Control Scientific article about temperature controller. Addresses controller types, algorithms, transient responses and simulations. newton.ex.ac.uk/teaching/CDHW/Feedback

The Nyquist Criterion Using Bode Plots Explains the controller stability criteria based on the Nyquist frequency response. Includes mathematical formulations and diagrams. virtual.cvut.cz/dynlabmodules/syscontrol/node45.html

Nyquist Stability Explains the basics of the Nyquist controller stability criteria. Includes diagrams and Bode plots. www.facstaff.bucknell.edu/../eControlHTML/Freq/Nyquist3.html

PID Control - System Characterization – Stability Comprehensive article about PID control and related stability aspects. zone.ni.com/../../../29533F539B47A15B8625696B00744C42

PID Controller Description of the PID control loop. Includes transient diagrams and source codes. www.ecircuitcenter.com/Circuits/pid1/pid1.htm

PID Without a PhD Overview of the PID control theory in plain text. Addresses mathematical background, tuning and transient response. www.embedded.com/2000/0010/0010feat3.htm

Process Dynamics and Control Lecture notes on process dynamics and control from the University of Pittsburgh, USA. Includes introduction, sorted notes and examples. sage.che.pitt.edu/~che1034

Resource Center for Engineering Laboratories on the Web Resource center dedicated to the control and process dynamics of the University of Tennessee. Includes interactive experiments, tutorials and publications. chem.engr.utc.edu

Review of Classical Control Theory Review of the control theory from the University of Arizona, USA. Addresses feedback control, steady state errors, transient and frequency response. classes.engr.arizona.edu/ame558/public_html/topic1/page1.html

Signals, Systems and Control Demonstrations Resource of applets and interactive lectures dedicated the control theory from the Johns Hopkins University. www.jhu.edu/~signals

Some Basic Control Theory Brief summary of control loops. Includes keyword glossary. wijnands.home.cern.ch/wijnands/control_1.html

Tuning a PID Controller Describes the different types of controller. Addresses efficiency and stability aspects. www.newportus.com/Products/Techncal/techncal.htm

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