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[ pdf ] The PID Control Algorithm

``` Download 106 times Topic under  Control Mode Source: controlsforyou.com  File size: 921.27 KB File type: pdf Last download on: Tue Apr 10, 2018 05:21:33 AM Short Desciption: How it works, how to tune it, and how to use it, Process control is the measurement of a process variable, the comparison of that variables with its respective set point, and the manipulation of the process in a way that will hold the variable at its set point when the set point changes or when a disturbance changes the process. Summary: Chapter 1 Introduction.1 1.1 The Control Loop2 1.2 Role of the control algorithm.3 1.3 Auto/Manual.3 Chapter 2 The PID algorithm.5 2.1 Key concepts.5 2.2 Action.5 2.3 The PID responses.5 2.4 Proportional.6 2.5 Proportional—Output vs. Measurement.7 2.6 Proportional—Offset.7 2.7 Proportional—Eliminating offset with manual reset.8 2.8 Adding automatic reset9 2.9 integral mode (Reset).10 2.10 Calculation of repeat time11 2.11 Derivative12 2.12 Complete PID response.14 2.13 Response combinations.14 Chapter 3 Implementation Details of the PID Equation15 3.1 Series and Parallel Integral and Derivative.15 3.2 Gain on Process Rather Than Error16 3.3 Derivative on Process Rather Than Error.16 3.4 Derivative Filter16 3.5 Computer code to implement the PID algorithm16 Chapter 4 Advanced Features of the PID algorithm.20 4.1 Reset windup.20 4.2 External feedback21 4.3 Set point Tracking.21 Chapter 5 Process responses23 5.1 Steady State Response.23 5.2 Process dynamics27 5.3 Measurement of Process dynamics31 5.4 Loads and Disturbances.33 Chapter 6 Loop tuning.34 6.1 Tuning Criteria or “How do we know when its tuned”34 6.2 Mathematical criteria—minimization of index.35 6.3 Ziegler Nichols Tuning Methods.36 6.4 Cohen-Coon40 6.5 Lopez IAE-ISE41 6.6 Controllability of processes.41 6.7 Flow loops.42 Chapter 7 Multiple Variable Strategies44 Chapter 8 Cascade.45 8.1 Basics45 8.2 Cascade structure and terminology47 8.3 Guideline for use of cascade47 8.4 Cascade Implementation Issues.48 8.5 Use of secondary variable as external feedback.51 8.6 Tuning Cascade Loops52 Chapter 9 Ratio.53 9.1 Basics53 9.2 Mode Change54 9.3 Ratio manipulated by another control loop.54 9.4 Combustion air/fuel ratio.55 Chapter 10 Override57 10.1 Example of Override Control.57 10.2 Reset Windup58 10.3 Combustion Cross Limiting.59 Chapter 11 Feedforward61 Chapter 12 Bibliography62 Bookmark or share this info on Google+ and leave comment at below : ``` ``` ```

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