Modeling, simulation and robust control of an electro-pneumatic actuator for a variable geometry turbocharger. (Modelisation, simulation et commande robuste d'un actionneur électropneumatique pour le pilotage d'un turbocompresseur à géométrie variable) (original) (raw)
Related papers
2011
To God for giving me the blessings, the grace, the life and other gifts. I want to express special words of gratitude to all persons, who have contributed to the successful completion of my degree of Doctor of Philosophy. This important achievement would not have been possible without the help, the advice and the support of all them. First of all, I would like to thank my supervisors, professor Mario di Bernardo, professor Stefania Santini and Dr. Alessandro di Gaeta. This Ph.D. thesis would not exist without their constant scientific and moral support. Moreover, I thank them for all the countless formative and rewarding scientific discussions, that we had during these three years, where the theory, the technique and the beauty behind them were merged in exquisite mathematical formalisms. I learned a lot from their methods to do and guide the scientific research. They made unique my Ph.D. experience and I will take with me all their teachings as a invaluable thesaurus of my life. I thank Professor Francesco Garofalo for all his help during my Ph.D. course. I thank all colleagues from the SINCRO Group (Piero, David, Alessandro, Lucia, Giovanni and Umberto) for their suggestions to improve my research during our Labmeetings. Umberto deserves special thanks for his help, advices and fruitful cooperation, which have enormously contributed to this thesis. I thank to the SINCRO staff: Dino, Achille, Michelle, Anamaria and Ana; to the Ph.D. students (Francesca, Mariacarla, Fanny, Emmanuela and both Giussepes); to the students (Giuseppe, Francesco and Ylenia); and to the staff of the University of Naples Federico II, for their technical support. Special thanks to Michelle who picked me up periodically each week and to all members of the soccer group, we shared nice emotions playing soccer.
Design and Manufacturing of a Turbocharger Jet Engine
The success and outcome of this project required a lot of guidance and assistance from many people and we extremely privileged to have got this all along the completion of the project. All that we have done is only due to such supervision and assistance, so we would like to thank.
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...
Modeling and Identification of Electro-Pneumatic VNT Actuator for Simulation and Control
8th IFAC Symposium on Nonlinear Control Systems, 2010
An accurate non-linear model based control of the electro-pneumatic actuator adjoined to a Variable Nozzle Turbocharger (VNT) is proposed in this paper. Electro-pneumatic actuator is composed of electro-pneumatic pressure converter (EPC) coupled to pneumatic actuator. A precise physical model which captures fundamental dynamics of pneumatic actuator and its interaction with EPC is proposed. Dynamics of the pressure inside the actuator chamber are modeled, considering variation in volume and the temperature, along with EPC controlled air mass flow to the actuator. Modeling of air-leakage phenomenon in the EPC is also addressed. Comparison between simulation and experimental results shows the effectiveness of the proposed model.
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...
MATEC Web of Conferences, 2020
Using electric energy in a potentially explosive atmosphere raises several problems that must be solved when designing, manufacturing and during the operation of electric equipment. Their approach requires special attention, considering the multiple technical, economical and labour safety aspects. The ingress protection for the electrical part of the valves is ensured by the capsulation assembly, comprising the protection measures applied for preventing the ignition of the surrounding atmosphere. The labyrinth seal through which the gas flow passes is designed so as to confine a potential ignition inside actuator’s flameproof enclosure. Numerical simulations were conducted for determining the combustion behaviour and the optimum width and geometry of the labyrinth canals.
Mechatronic Systems with Pneumatic Drive
International conference Fluid Power 2019: Conference Proceedings, 2019
The International Fluid Power Conference is a two day event, intended for all those professionally-involved with hydraulic or pneumatic power devices and for all those, wishing to be informed about the 'state of the art', new discoveries and innovations within the field of hydraulics and pneumatics. The gathering of experts at this conference in Maribor has been a tradition since 1995, and is organised by the Faculty of Mechanical Engineering at the University of Maribor, in Slovenia. Fluid Power conferences are organised every second year and cover those principal technical events within the field of fluid power technologies in Slovenia, and throughout this region of Europe. This year's conference is taking place on the 19th and 20th September in Maribor.
Experimental setup for turbocharger control
This paper presents the mechanical details regarding a new control test rig for laboratory use. A variable geometry turbocharger is this system central part. In this paper it will be shown how this rotating machine can be decoupled from the internal combustion engine and fitted in a testbench where a computer emulates the vehicle’s motor. In order to accomplish this, a dozen of mechanical parts were designed and built. In addition, a set of sensors and actuators was adapted to the system. This article will show the final result of a system that will be used to test several different control strategies, with relevance given to the coefficient diagram method.
Introductory Study of Variable Valve Actuation for Pneumatic Hybridization
SAE Technical Paper Series, 2007
Urban traffic involves frequent acceleration and deceleration. During deceleration, the energy previously used to accelerate the vehicle is mainly wasted on heat generated by the friction brakes. If this energy that is wasted in traditional IC engines could be saved, the fuel economy would improve. One solution to this is a pneumatic hybrid using variable valve timing to compress air during deceleration and expand air during acceleration. The compressed air can also be utilized to supercharge the engine in order to get higher load in the first few cycles when accelerating. A Scania D12 single-cylinder diesel engine has been converted for pneumatic hybrid operation and tested in a laboratory setup. Pneumatic valve actuators have been used to make the pneumatic hybrid possible. The actuators have been mounted on top of the cylinder head of the engine. A pressure tank has been connected to one of the inlet ports and one of the inlet valves has been modified to work as a tank valve. The goal has been to test and evaluate 2 different modescompression mode (CM) where air is stored in an air tank during deceleration and air-motor mode (AM) where the previously stored pressurized air is used for accelerating the vehicle. This paper also includes an optimization of the CM.