Modeling and Identification of Electro-Pneumatic VNT Actuator for Simulation and Control (original) (raw)
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2012
The choice of technology for automotive actuators is driven by the need of high power to size ratio. In general, electro-pneumatic actuators are preferred for application around the engine as they are compact, powerful and require simple controlling devices. Specially, Variable Geometry Turbochargers (VGTs) are almost always controlled with electro-pneumatic actuators. This is a challenging application because the VGT is an important part of the engine air path and the latter is responsible for intake and exhaust air quality and exhaust emissions control. With government regulations on vehicle pollutant emissions getting stringent by the year, VGT control requirements have also increased. These regulations and requirements can only be fulfilled with precise dynamic control of the VGT through its actuator. The demands on actuator control include robustness against uncertainty in operating conditions, fast and smooth positioning without vibration, limited number of measurements. Added...
Nonlinear Modeling of the VNT Pneumatic Actuator with Aero-dynamic Force
IFAC Proceedings Volumes, 2010
This paper describes a physical model of an industrial pneumatic actuator used to control variable nozzle turbocharger (VNT). Friction force, that causes hysteresis, is identified using Dahl friction model. Model is tested and compared with experimental results, provided by Honeywell Turbo Technologies (HTT), at different engine conditions. Aerodynamic force acting on the turbocharger is modeled and identified as a function of pressure ratio across turbine and vane angle of the VNT. Comparison between simulation results and experimental results shows the effectiveness of the proposed model.
2012
This work has been performed at the System and Transports (SeT) laboratory, under the supervision of Prof. M. El Bagdouri and Dr. S. Laghrouche. This work would not have been possible without their motivation, enthusiasm and immense knowledge. First, I would like to thank both of my supervisors for all the support and encouragement they have provided during this work. I would also like to thank them for providing me an opportunity to work with project partners of SIMBA (SIMulation de la Boucle d'Air) from industry. I would like to thank the jury members: Prof. X. Brun and Prof. H. Chafouk for reviewing my thesis and giving me very useful remarks on the report. I am also very thankful to Prof. A. El Moudni and Prof. M. Basset for their participation as examiners in the jury. This project was realized with collaboration of Faurecia Emissions Control Technologies, Honeywell Turbo Technologies and Mark IV. I am also grateful to Mr. D. Ragot from Faurecia, Mr. D. Guyon from Mark IV and Mr. J. S. Roux from Honeywell for their guidance and technical support which helped me to solve technical issues related to my thesis. My colleagues certainly deserve a mention since they have significantly contributed not only to my work but also to my social life. Special thanks to Mr. F. S. Ahmed for his help for conducting experiments on the test bench, Mr. M. Harmouche for helping me to sort out bugs in control theory, Mr. I. Matraji, A. El Amroui and K. Dar for their moral support and organizing the outdoor activities which made my stay very memorable in Belfort. Last but not the least, I would like to say special thanks to my parents and other family members for their continues support and love throughout my life. They were always v vi CONTENTS there to celebrate my success and to overcome the fear of failures in my life. Their unconditional support helped me to accomplish this objective with courage and enthusiasm.
Study of the nonlinear control techniques for single acting VGT pneumatic actuator
International Journal of Vehicle Design, 2012
In this paper, we have developed a detailed mathematical model of a pneumatic actuator for a Variable Geometry Turbocharger (VGT) equipped with an Electro-pneumatic Pressure Converter (EPC). This model may require complex calculations for control purpose; therefore the dynamics of the EPC have been neglected and replaced by a static gain. These models incorporate friction and aerodynamic force related effects by using adaptive LuGre model. To compensate for parametric uncertainties, two single-input single-output nonlinear position control laws are designed using the second order sliding mode (SMC) and backstepping control. A comparative study with experiments shows the effectiveness of the proposed controllers.
A Dynamic Model of an Electropneumatic Valve Actuator for Internal Combustion Engines
Journal of Dynamic Systems, Measurement, and Control, 2010
This paper presents a detailed model of a novel electropneumatic valve actuator for both engine intake and exhaust valves. The valve actuator’s main function is to provide variable valve timing and variable lift capabilities in an internal combustion engine. The pneumatic actuation is used to open the valve and the hydraulic latch mechanism is used to hold the valve open and to reduce valve seating velocity. This combination of pneumatic and hydraulic mechanisms allows the system to operate under low pressure with an energy saving mode. It extracts the full pneumatic energy to open the valve and use the hydraulic latch that consumes almost no energy to hold the valve open. A system dynamics analysis is provided and followed by mathematical modeling. This dynamic model is based on Newton’s law, mass conservation, and thermodynamic principles. The air compressibility and liquid compressibility in the hydraulic latch are modeled, and the discontinuous nonlinearity of the compressible f...
Control of the Electro-Pneumatic VGT Actuator with Friction Compensator
Proceedings of the 18th IFAC World Congress, 2011
This paper describes friction compensation based control of an industrial pneumatic actuator used for the variable geometry turbocharger (VGT). Adaptive LuGre model for friction has been used in this work. Friction force that is responsible for hysteresis and hunting phenomenon in the position control is compensated with two different control strategies designed to improve low velocity position tracking. The first approach is related to the knocking the input signal to reduce position error. In the second approach, an adaptive LuGre model based friction observer is proposed for friction compensation. At the end both approaches are compared with the help of experiments on the actuator.
pneumatic actuator, force, pressure, stroke length.
IJSRD, 2014
This paper presents the conversion of pneumatic actuated waste gated turbo charger to electrically actuated waste gated turbo charger using a DC brushed motor. In recent years, the turbo charger is one of the basic accessories in a heavy vehicle. Its function is to enable more amount of fresh charge and enhance the development of power. The need of compactness and higher efficiency for a turbocharger in automotive application allows reduction in power consumption. To address the above criteria, study has been carried out to develop a compact waste gate turbocharger which is electrically actuated. Electric actuator consists of a electric motor with speed reducing gear and a output linear actuator to operate the waste gate valve. The advantage over the conversion of pneumatic to electric are better response increase turbine efficiency The angle of valve opening can be manipulated as required ,enabling the turbocharger to run at its maximum efficiency speed for most time.
POSITION CONTROL OF ELECTRO-PNEUMATIC PROPORTIONAL VALVE WITH PRESSURE FEEDBACK
2018
In this study, work will be done to establish the model of electro-pneumatic proportional valve, when converting the electronic interceptor system to pneumatic system. This system will have to work continuously dynamically to keep the constant and controllable position of the pneumatic piston with pressure feedback in the system. Thus, Electro-pneumatic valve will model to control to keep constant position of piston system with Non-linear modelling. At the beginning the schematic model of the electro-pneumatic proportional valve will be analyzed. Then, the sub components and working principles of the pneumatic system and control elements will be ascertained. The mathematical model of the system will be obtained. Such a system like this are dynamic system therefore time-dependent differential equations will be used to express. The equations to be used at the beginning will be dynamic equations, later the pressure transfer equations which model the signal from position of piston, from disturbance force, from disturbance pressure effect etc. At the end of all this, the Simulink program will be included in the project. Mathematical model of the system will be coded in the Simulink program After the modeling and coding of the system is complete, it is aimed to analyze how long the system simulator is in the desired position and in what intervals the position error is and finding controller parameters.
Modeling and control of a monopropellant-based pneumatic actuation system
2003 IEEE International Conference on Robotics and Automation (Cat. No.03CH37422)
This work describes the modeling and control of a proposed actuation system that is capable of pressurizing a chamber volume via the catalytic decomposition of a liquid monopropellant controlled by a binary on/off propellant valve. Two design configurations of the actuation system are presented and common portions of both are energetically modeled. The parameters of the resulting dynamic model are meaningful physical properties of either the propellant or the system. A model-based switching controller is then applied to the task of pressure tracking. Model validation and controller performance are shown experimentally.
Model-based predictive control of an Electro-Pneumatic exhaust valve for Internal Combustion engines
2008 American Control Conference, 2008
Variable valve actuation of Internal Combustion (IC) engines is capable of significantly improving their performance. Variable valve actuation can be divided into two main categories: variable valve timing with cam shaft(s) and camless valve actuation. For camless valve actuation, research has been centered in electro-magnetic, electro-hydraulic, and electro-pneumatic valve actuators. This research studies the control of the electro-pneumatic valve actuator. The modeling and control of intake valves for the Electro-Pneumatic Valve Actuators (EPVA) was shown in early publications and this paper extends the EPVA modeling and control development to exhaust valves for both valve timing and lift control. The control strategy developed utilizes model-based predictive techniques to overcome the randomly variable in-cylinder pressure against which the exhaust valve opens.