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Sliding mode control in automotive applications

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Abstract:
Interest to Sliding Mode Control is explained by the robustness with respect to plant parameter variations and disturbances. On the other hand sliding motions enable decoupling the overall motion into independent partial components of lower dimensions. Due to these properties the sliding mode control methods are efficient tool to control high order nonlinear dynamic systems operating under uncertainty conditions, which is common for the processes in automotive industry. Sliding mode control with discontinuous control actions may be implemented easily using electronic power converters with on-off admissible operation mode only. - Control and Estimation of Automotive Alternator The objective of the research is development of methods for control and estimation of sensorless synchronous rectification for automotive alternator. Theoretical developments deal with the observer for back electromotive force of the alternator. The design method of the estimator with readily available buttery current measurement is discussed. Theoretical results are validated by simulation and experiments at the set up of Ford Scientific Research Laboratory. - Sensorless Sliding Mode Control of Induction Motors The speed and torque control systems for induction motors are developed with no sensors of mechanical variables (such as speed, position or torque). Special attention is paid to sensorless torque control of induction motors which may be applied in hybrid electric vehicles. A new sliding mode observer is designed to estimate time-varying components of motor flux and rotation speed. Theoretical results are validated by simulation and experiments at the set up at OSU. - Air/Fuel Ratio (A/F) Control The principle obstacle for the designing high-accuracy A/F control is lack of information on the system state and parameters, since commonly used EGO sensors are of binary type. First, parameter and state observation methods for the systems with binary output information were developed and then they were integrated into a sliding mode control system. Theoretical results are validated by simulation and experiments at the set up at OSU. - Control of Variable Geometry Turbocharged Diesel Engines (VGT). The behavior of VGT is represented by a high order nonlinear system with limited information on the parameters and state components and strong interaction between control loops. The system exhibits instability if each of the output variable (compressor mass flow rate and EGR flow rate) is controlled independently. The sliding mode control methods were developed to design a stable system with high rate of convergence to the desired state. The efficiency of control algorithms was validated by simulation for a full order model with actuator dynamics. - ABS Control To improve the braking performance, the ABS system should be able to maintain the maximum braking force with no information on wheel slip and tire-road conditions. Therefore the approach to maximize and maintain maximum friction coefficient by utilizing non-linear dynamic optimization technique is straightforward and promising for desighning a brake system. The control algorithms of the current research are based on self-optimization methods developed in the framework of the sliding mode control theory. Simulation results show that the system reaches the maximum friction torque mode for any initial states (including lock up and zero slip) and keep it in the course of breaking. - Camless Engine The position tracking control of an electromagnetic valve actuator for a camless combustion engine was designed. The control system comprised robust estimation and control tools from the sliding mode control methodology. Its superior performance was demonstrated first in simulations and then the control was successfully implemented on the real hardware at a lab bench with a rapid control implementation system.

Type of Seminar:
Public Seminar
Speaker:
Prof. Vadim Utkin
Ohio State University, USA
Date/Time:
Aug 25, 2004   17:15
Location:

ETH-Zentrum, ETZ E6, Gloriastrasse 35, 8006 Zurich
Contact Person:

Prof. L. Guzzella
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Biographical Sketch:
Prof V. Utkin graduated from Moscow Power Institute (Dipl.Eng.), received a Ph.D. and Doctor of Sciences degrees from the Institute of Control Sciences (Moscow, Russia). He was with the Institute of Control Sciences since 1960, as Head of the Discontinuous Control Systems Laboratory in 1973-1994. Currently he is a professor of the Ohio State University. Prof. Utkin is one of the originators of the concepts of Variable Structure Systems and Sliding Mode Control. He is an author of five books and more than 280 technical papers. In 1975-1978 he was in charge of an international project between his Institute and "Energoinvest", Sarajevo on the sliding mode control of induction motors. D.C., induction and synchronous drives with sliding mode control have been applied for metal-cutting machine tools, process control and electric cars. His current research interests are control of infinite-dimensional plants including flexible manipulators, sliding modes in discrete time systems and microprocessor implementation of sliding mode control, control of electric drives and alternators, robotics and automotive control. As Ford Chair Professor he has been a PI of several projects with automotive companies. He is Honorary Doctor of University of Sarajevo, in 1972 was awarded Lenin Prize (the highest scientific award in the former USSR), in 2003 – Oldenburger medal of ASME. He is an IEEE fellow. He held visiting positions at universities in the USA, Japan, Italy and Germany. Prof. V.Utkin was IPC chairman of 199O IFAC Congress in Tallinn; now he is Associate Editor of "International Journal of Control", Chairman of Technical Committee of IEEE on Variable Structure and Sliding Mode Control, member of Administrative Committee of IEEE Industrial Electronics Society.