scholarly journals Improved Position Control for an EGR Valve System with Low Control Frequency

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 457
Author(s):  
Hyeong-Jin Kim ◽  
Yung-Deug Son ◽  
Jang-Mok Kim
Keyword(s):  
Position Control ◽  
Feedforward Control ◽  
Fast Response ◽  
Control Frequency ◽  
Position Response ◽  
Control Scheme ◽  
Position Controller ◽  
Valve Position ◽  
Feedforward Controller ◽  
Gas Recirculation

An exhaust gas recirculation (EGR) valve position control system requires fast response without overshoot, but the low control frequency limits control bandwidth and results in poor position response. A novel EGR valve position control scheme is proposed to improve the position response at low control frequency. This is based on the feedforward controller, but the feedforward control loop is implemented without the position pattern generator or derivative. The proposed method estimates the acceleration command through the relationship between the position controller output, the speed command and the speed limiter, and compensates the cascaded proportional-proportional integral (P-PI) controller. In this method, many operations are not required and noise due to derivative is not generated. This method can improve the position response without much computation and derivative noise at the low control frequency. Experimental results are presented to verify the feasibility of the proposed position control algorithm.

scholarly journals Design and Experimental Evaluation of a Robust Position Controller for an Electrohydrostatic Actuator Using Adaptive Antiwindup Sliding Mode Scheme

2013 ◽  
Vol 2013 ◽  
pp. 1-16 ◽  
Author(s):  
Ji Min Lee ◽  
Sung Hwan Park ◽  
Jong Shik Kim
Keyword(s):  
Control Systems ◽  
Pid Controller ◽  
Position Control ◽  
Sliding Mode ◽  
System Modeling ◽  
Modeling Error ◽  
Load Disturbance ◽  
Control Scheme ◽  
Position Controller ◽  
System Uncertainties

A robust control scheme is proposed for the position control of the electrohydrostatic actuator (EHA) when considering hardware saturation, load disturbance, and lumped system uncertainties and nonlinearities. To reduce overshoot due to a saturation of electric motor and to realize robustness against load disturbance and lumped system uncertainties such as varying parameters and modeling error, this paper proposes an adaptive antiwindup PID sliding mode scheme as a robust position controller for the EHA system. An optimal PID controller and an optimal anti-windup PID controller are also designed to compare control performance. An EHA prototype is developed, carrying out system modeling and parameter identification in designing the position controller. The simply identified linear model serves as the basis for the design of the position controllers, while the robustness of the control systems is compared by experiments. The adaptive anti-windup PID sliding mode controller has been found to have the desired performance and become robust against hardware saturation, load disturbance, and lumped system uncertainties and nonlinearities.

Multi-Rate Feedforward Tracking Control for Plants With Nonminimum Phase Discrete Time Models

1999 ◽  
Vol 123 (3) ◽  
pp. 556-560 ◽  
Author(s):  
Yuping Gu ◽  
Masayoshi Tomizuka
Keyword(s):  
Discrete Time ◽  
Tracking Control ◽  
Performance Enhancement ◽  
Feedforward Control ◽  
Phase Error ◽  
Sampling Rate ◽  
Time Model ◽  
Rate System ◽  
Control Scheme ◽  
Feedforward Controller

This paper is concerned with performance enhancement of tracking control systems by multi-rate control. The feedback controller is updated at the same rate as the sampling rate of the output measurements. The feedforward controller processes the desired output signal for high accuracy tracking, and its output is updated at a rate N-times faster than the sampling rate of the output measurements. The discrete time model of the controlled plant may possess unstable zeros, and the zero phase error tracking controller (ZPETC) is used as a feedforward controller. Inter-sample behavior of the plant is included in evaluating the tracking performance of the multi-rate system. Illustrative examples are given to show advantages of the proposed multi-rate feedback/feedforward control scheme.

A Digital Proportional Position Control Scheme

1978 ◽  
Vol 15 (1) ◽  
pp. 77-81
Author(s):  
R. Subbayyan ◽  
M. C. Vaithilingam ◽  
G. Lakshmanna
Keyword(s):  
Position Control ◽  
Digital Controller ◽  
Position Transducer ◽  
Control Scheme ◽  
Position Controller ◽  
Position Servo

This paper describes the principles and fabrication details of a digital proportional position controller using a synchro resolver as position transducer. The digital controller can be readily attached to existing analog position servo demonstration units available in educational laboratories.

scholarly journals Design and Position Control of Overhang-Type Rail Mover Using Dual BLAC Motor

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1000
Author(s):  
Kiwan Cho ◽  
Dong-Hee Lee
Keyword(s):  
Position Control ◽  
Position Sensor ◽  
Position Information ◽  
Position Errors ◽  
Control Scheme ◽  
Speed Range ◽  
Position Controller ◽  
State Position ◽  
Instantaneous Speed ◽  
And Control

This paper presents the design and position control scheme of an overhang-type rail mover system driven by a dual Brushless AC (BLAC) motor with a simple Hall position sensor inside each motor. The overhang-type roller is chosen to reduce the slip between the roller and rail surface due to gravity. The BLAC motors are used to provide smooth translation along the rail and effective turning. Imbalances on any part of the motor and the simplicity of the Hall position sensor can create additional disturbance load, unsteady movement, and position errors. To reduce the sudden moving position error between the two motors, a balancing compensator with a Proportional-Differential (PD) position controller, which is based on the instantaneous speed and position trajectories, is presented. Furthermore, speed and position reference models are designed to compensate for the low Hall sensor resolution in the low-speed range. Therefore, steady-state position errors can then be regulated simply by using the instantaneous speed and position information. Experiments were performed to verify the viability of the proposed system and control. The results show a significant improvement in roller translation along the rail and stopping position accuracy.

An enhanced feedback-feedforward control scheme for process industries

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Manish Yadav ◽  
Hirenkumar G. Patel
Keyword(s):  
Transfer Function ◽  
Disturbance Rejection ◽  
Dead Time ◽  
Feedforward Control ◽  
Absolute Error ◽  
Industrial Applications ◽  
Process Industries ◽  
Control Scheme ◽  
Feedforward Controller ◽  
Bode’S Ideal Transfer Function

Abstract In this article, a unified control scheme is proposed for dead-time compensation and disturbance rejection via feedback and feedforward controller. The objectives of this work are suggested in two folds, first tuning of fractional order feedback controller via delayed Bode’s ideal transfer function instead of conventional Bode’s ideal transfer function with the benefits of dead time compensator and second feedforward controller for disturbance rejection. An existing method is utilized for comparison with the proposed scheme. To examine the efficacy of the proposed method robustness test is also carried out via sensitivity analysis. For quantifiable evaluation of the proposed scheme Integral Absolute Error (IAE) and Integral Square Error (ISE) are utilized. For the usefulness of the proposed scheme, two practical problems are demonstrated in this paper. The limpidity and instinctive appeal of the proposed scheme make it beautiful for industrial applications.

Reinforcement learning-based dynamic position control of mobile node for ocean sensor networks

2021 ◽  
pp. 014233122110430
Author(s):  
Weijun Wang ◽  
Huafeng Wu ◽  
Xianglun Kong ◽  
Yuanyuan Zhang ◽  
Yang Ye ◽  
...  
Keyword(s):  
Reinforcement Learning ◽  
Sensor Networks ◽  
Position Control ◽  
Response Speed ◽  
Fast Response ◽  
Mobile Node ◽  
Position Estimation ◽  
Mobile Nodes ◽  
Control Scheme ◽  
Ocean Sensor Networks

In this paper, a novel dynamic position control (PC) approach for mobile nodes (MNs) is proposed for ocean sensor networks (OSNs) which directly utilizes a neural network to represent a PC strategy. The calculation of position estimation no longer needs to be carried out in the proposed scheme, so the localization error is eliminated. In addition, reinforcement learning is used to train the PC strategy, so that the MN can learn a more highly accurate and fast response control strategy. Moreover, to verify its applicability to the real-world environment, we conducted field experiment deployment in OSNs consisting of a MN designed by us and some fixed nodes. The experimental results demonstrate the effectiveness of our proposed control scheme with impressive improvements on PC accuracy by more than 53% and response speed by more than 15%.

Nonlinear Feedforward-Feedback Control of an Electric Clutch Actuator

2014 ◽  
Vol 1014 ◽  
pp. 339-343 ◽  
Author(s):  
Xin Li ◽  
Hui Zhou ◽  
Hao Li ◽  
Xue Song Li
Keyword(s):  
Feedback Control ◽  
Feedforward Control ◽  
Experimental Tests ◽  
Linear Feedback ◽  
Original Form ◽  
Model Errors ◽  
Nonlinear Characteristics ◽  
Control Scheme ◽  
Control Requirement ◽  
Feedforward Controller

For a novel electric clutch actuator, a nonlinear feedforward-feedback control scheme is proposed to improve the performance of the position tracking control. The feedforward control is designed based on flatness in consideration of the system nonlinearities, and the linear feedback control is given to accommodate the model errors and the disturbances. Lookup tables, which are used to represent nonlinear characteristics of the actuator systems, such as friction force, appear in their original form in the designed feedforward controller. The designed controller is evaluated through simulations and experimental tests, which show that the proposed controller satisfied the control requirement. Comparison with PID control is given as well.

scholarly journals High-Accuracy and Fast-Response Flywheel Torque Control

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
Xinxiu Zhou ◽  
Meng Li ◽  
Ran Zhang
Keyword(s):  
Degrees Of Freedom ◽  
Current Mode ◽  
Response Speed ◽  
Fast Response ◽  
Torque Control ◽  
Recursive Least Squares ◽  
Control Scheme ◽  
Feedforward Controller ◽  
Speed Mode ◽  
Motor Drive System

Compared with current mode flywheel torque controller, speed mode torque controller has superior disturbance rejection capability. However, the speed loop delay reduces system dynamic response speed. To solve this problem, a two-degrees-of-freedom controller (2DOFC) which consists of a feedback controller (FBC) and a command feedforward controller (FFC) is proposed. The transfer function of FFC is found based on the inverse model of motor drive system, whose parameters are identified by recursive least squares (RLS) algorithm in real-time. Upon this, Kalman filter with softening factor is introduced for the improved parameters identification and torque control performances. Finally, the validity and the superiority of the proposed control scheme are verified through experiments with magnetically suspended flywheel (MSFW) motor.

scholarly journals Low Cost Position Controller for Exhaust Gas Recirculation Valve System

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2171 ◽  
Author(s):  
Habib Bhuiyan ◽  
Jung-Hyo Lee
Keyword(s):  
Position Control ◽  
Control Method ◽  
Low Cost ◽  
Static Friction ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Automotive Applications ◽  
Valve System ◽  
Position Controller ◽  
Gas Recirculation

This paper proposes a position control method for a low-cost exhaust gas recirculation (EGR) valve system for automotive applications. Generally, position control systems used in automotive applications have many restrictions, such as cost and space. The mechanical structure of the actuator causes high friction and large differences between static friction and coulomb friction. When this large friction difference occurs, the position control vibrates when the controller uses a conventional linear controller such as the P or PI controller. In this paper, we introduce an inexpensive position control method that can be applied under the high-difference-friction mechanical systems. The proposed method is verified through the use of experiments by comparing it with the results obtained when using a conventional control system.

Adaptive Feedforward Vibration Control of Flexible Structure With Discrete Sliding Mode Controller

2006 ◽  
Author(s):  
J. Fei
Keyword(s):  
Control System ◽  
Sliding Mode Control ◽  
Sliding Mode ◽  
Feedforward Control ◽  
Flexible Beam ◽  
Sliding Mode Controller ◽  
Control Scheme ◽  
Feedforward Controller ◽  
Adaptive Lms ◽  
Adaptive Feedforward

This paper presents an adaptive feedforward control scheme using the least mean square (LMS) algorithm combined with sliding mode control for a flexible beam using piezoceramic actuator. A finite element model of the dynamic response of flexible beam system with PZT patches is derived and analyzed. Implementation of an adaptive LMS feedforward controller has the advantages of inherent stability and simplicity in design. The proposed adaptive LMS feedforward control system maintains the basic structure of the adaptive feedforward controller, but incorporates reference model in the system. Discrete sliding mode controller is added in the feedback loop to enhance the robustness of control system subjected to the variation of system parameters and external disturbances. Simulation results from flexible beam model verify the effectiveness of the proposed adaptive LMS feedforward with sliding mode control scheme and good disturbance rejection properties.

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