The by far most used control method in industry is the proportional-integral-derivative or PID controller. It is currently claimed that 90 to 95% of industrial problems can be solved by this type of controller, which is easily available as an electronic module. It allies an apparent simplicity of understanding and a generally satisfactory performance. It is based on a quasi-natural principle which consists of acting on the process according to the error between the set point and the measured output. Indeed, along the chapters of this first part, it will appear that numerous variants of PID exist and that improvements can often be brought either by better tuning or by a different configuration.
KeywordsTransfer Function Open Loop Integral Action Derivative Action Linear Feedback Control
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