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Related Concept Videos

PID Controller01:19

PID Controller

Proportional-Integral-Derivative (PID) controllers are widely used in various control systems to enhance stability and performance. In a thermostat, it adjusts heating or cooling based on the temperature difference between the actual and desired levels. They are often used in automotive speed systems, effectively managing sudden speed changes while maintaining a constant speed under varying conditions. On the other hand, PI controllers, commonly employed in voltage regulation, enhance stability...
Time and frequency -Domain Interpretation of PI Control01:27

Time and frequency -Domain Interpretation of PI Control

Proportional-Integral (PI) controllers are essential in many control systems to improve stability and performance. They are commonly used in everyday devices like thermostats to enhance system damping and reduce steady-state error. When the zero in the controller's transfer function is optimally placed, the system benefits significantly in terms of stability and accuracy.
Acting as a low-pass filter, the PI controller slows the system's response and extends settling times. This requires careful...
PD Controller: Design01:26

PD Controller: Design

In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
PI Controller: Design01:24

PI Controller: Design

Proportional Integral (PI) controllers are a fundamental component in modern control systems, widely used to enhance performance and mitigate steady-state errors. They are particularly effective in applications such as automatic brightness adjustment on smartphones, where they excel at mitigating steady-state errors for step-function inputs. Unlike PD controllers, which require time-varying errors to function optimally, PI controllers leverage their integral component to address residual...
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass filters, manage...

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Interactive and Visualized Online Experimentation System for Engineering Education and Research
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A normalized PID controller in networked control systems with varying time delays.

Hoang-Dung Tran1, Zhi-Hong Guan, Xuan-Kien Dang

  • 1College of Automation, Huazhong University of Science and Technology, Wuhan 430074, PR China.

ISA Transactions
|July 2, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a novel normalized PI/PID controller for networked control systems (NCSs) that ensures stability and robustness despite network delays. The controller offers simplicity and flexibility for various processes and network conditions.

Keywords:
Gain and phase marginsNetworked control systemsPID tuningTime delays

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Area of Science:

  • Control Systems Engineering
  • Networked Control Systems (NCSs)
  • Automation and Robotics

Background:

  • Designing controllers for Networked Control Systems (NCSs) with delays is challenging due to requirements for simplicity, flexibility, stability, and robustness.
  • Network-induced delays significantly impact system performance and stability in NCSs.

Purpose of the Study:

  • To propose a novel normalized Proportional-Integral/Proportional-Integral-Derivative (PI/PID) controller for NCSs.
  • To enhance system stability and robustness in the presence of network-induced delays.
  • To develop a controller that is simple, flexible, and adaptable to various processes and network conditions.

Main Methods:

  • Utilizing a gain and phase margins approach to analyze system stability and robustness under network delays.
  • Formulating gain and phase margins of the closed-loop system considering total measured network delays.
  • Solving a set of equations derived from pre-specified gain and phase margins to calculate control parameters.
  • Proposing a normalized PI/PID controller based on these calculated parameters.

Main Results:

  • The proposed normalized PI/PID controller achieves simplicity without requiring re-solving optimization problems for new processes.
  • The controller demonstrates high flexibility to handle large-scale random delays and diverse processes.
  • An estimation method for the upper bound of random delay is provided, defining the controller's operating domain.
  • Simulation results validate the controller's advantages in various network-induced delay scenarios.

Conclusions:

  • The novel normalized PI/PID controller effectively addresses the complexities of NCSs with delays.
  • The controller provides a robust and flexible solution for maintaining system performance under uncertain network conditions.
  • The proposed method offers a practical approach for designing PI/PID controllers in NCS applications.