Design and Implementation of a Linear Active Disturbance Rejection Control-Based Position Servo Control System of an
Xin Cheng1,2, Jianzhong Yin2, Xiaokang Li2
1School of Information Engineering, Wuhan University of Technology, Wuhan 430070, China.
Sensors (Basel, Switzerland)
|March 13, 2024
Summary
This study introduces a new servo control system using linear active disturbance rejection control (LADRC) for exhaust gas recirculation (EGR) valves. The system enhances engine fuel economy and reduces emissions by improving valve positioning accuracy and response time.
Area of Science:
- Automotive Engineering
- Control Systems
- Mechanical Engineering
Background:
- Precise control of exhaust gas recirculation (EGR) valves is crucial for optimizing engine performance and reducing emissions.
- Electromotive (EM) valves face challenges in accurate positioning due to dynamic plant variations and external disturbances.
Purpose of the Study:
- To design a robust servo control system for EGR EM valves driven by limited angle torque motors (LATM).
- To address challenges posed by slowly varying dynamics and uncertain disturbances in EGR valve control.
Main Methods:
- Developed a dynamic model of the LATM-driven EGR valve system.
- Implemented linear active disturbance rejection control (LADRC) to estimate and compensate for total disturbances (model uncertainties and external factors) using an extended state observer (ESO).
- Utilized non-contact magnetic angle measurement and high-speed digital communication for closed-loop control.
Main Results:
- Achieved a full-stroke valve control accuracy better than 0.05 mm and a response time under 100 ms.
- Demonstrated robustness against shock-type external disturbances.
- Exhibited excellent airflow control capability with repeatability within 5% and standard deviation < 0.2 m³/h.
Conclusions:
- The proposed LADRC-based servo control system effectively ensures precision and real-time performance for EGR EM valves.
- The system offers significant improvements in valve positioning accuracy, response speed, and robustness, contributing to better engine efficiency and emission control.
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