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PID Control Download
Topic under  Control Mode
Source: www.cds.caltech.edu 
File size: 346.92 KB
File type: pdf
Last download on: Sat Mar 25, 2017 02:43:39 PM
Short Desciption:
special-purpose control systems. PID control is often combined with logic, .... obtain a good PID controller it is also necessary to consider

6.1 Introduction
The PID controller is the most common form of feedback. It was an essential element of early governors and it became the standard tool when process control emerged in the 1940s. In process control today, more than 95% of the control loops are of PID type, most loops are actually PI control. PID controllers are today found in all areas where control is used. The controllers come in many different forms. There are standalone systems in boxes for one or a few loops, which are manufactured by the hundred thousands yearly. PID control is an important ingredient of a distributed control system. The controllers are also embedded in many specialpurpose control systems. PID control is often combined with logic, sequential functions, selectors, and simple function blocks to build the complicated automation systems used for energy production, transportation, and manufacturing. Many sophisticated control strategies, such as model predictive control, are also organized hierarchically. PID control is used at the lowest level; the multivariable controller gives the setpoints to the controllers at the lower level. The PID controller can thus be said to be the “bread and buttert’t’ of control engineering. It is an important component in every control engineer’s tool box.
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