National Instruments 371685C-01 Manuale Utente

© National Instruments Corporation

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LabWindows/CVI PID Control Toolkit User Manual

About This Manual

Conventions ...................................................................................................................vii
Related Documentation..................................................................................................vii

Chapter 1
Overview of the PID Control Toolkit

System Requirements ....................................................................................................1-1
Installation Instructions..................................................................................................1-1
Activation Instructions...................................................................................................1-2
PID Control Toolkit Applications..................................................................................1-2
PID Control....................................................................................................................1-3

Chapter 2
PID Algorithms

The PID Algorithm ........................................................................................................2-1

Implementing the PID Algorithm with the PID Functions .............................2-2
Gain Scheduling ..............................................................................................2-3

The Precise PID Algorithm............................................................................................2-4

Error Calculation .............................................................................................2-4
Proportional Action .........................................................................................2-4
Trapezoidal Integration ...................................................................................2-5

The Autotuning Algorithm ............................................................................................2-5

Tuning Formulas .............................................................................................2-6

Chapter 3
Using the PID Control Toolkit

Designing a Control Strategy.........................................................................................3-1

Setting Timing .................................................................................................3-1
Tuning Controllers Manually ..........................................................................3-2

Using the PID Library....................................................................................................3-4

PID Controller .................................................................................................3-4
Using PID with Autotuning.............................................................................3-6
Using PID with Gain Scheduling ....................................................................3-7
Using PID with Lead-Lag ...............................................................................3-8
Using PID with Setpoint Profiling ..................................................................3-8
Using Ramp Generators ..................................................................................3-9