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5th IFAC Symposium on Mechatronic Systems, MECHATRONICS 2010

作者： Beck, Mark Schwung, Andreas Muenchhof, Marco Isermann, Rolf TU Darmstadt Institute of Automatic Control Laboratory for Control Systems and Process Automation 64283 Darmstadt Germany TU Darmstadt Institute of Automatic Control Laboratory for Control Theory and Robotics 64283 Darmstadt Germany

ISBN: (纸本)9783902661760

In this paper fault detection, fault diagnosis and active fault tolerant control of an electro-hydraulic servo-axis with a duplex-valve-system are described. The fault detection is based on parity equations. The semi-physical models allow the detection of even small faults in the hydraulic system. The fault diagnosis used on the testbed is based on fuzzy-logic. In order to tolerate a failed hydraulic proportional valve, a duplex-valve-system built up with standard direct-driven proportional valves is applied. The fault management module allows the supervision of the hydraulic servo axis and decides on reconfiguration and fault accomodation of the control-loop. The Internal Model control (IMC)-tracking control structure used for reconfiguration allows bumpless transfer between controllers. Experimental results show the industrial applicability of the approach. © 2010 IFAC.

关键词： Fault detection

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Identification of the nonlinear, multivariable behavior of mechatronic combustion engines

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IFAC Proceedings Volumes 2010年第18期43卷 16-23页

作者： R. Isermann A. Schreiber Institute of Automatic Control Laboratory of Control Engineering and Process Automation TU Darmstadt Germany

The identification of the nonlinear dynamic behavior of combustion engines on test benches is described. A method, that is based on the combination of statistical stationary engine measurement (Design of Experiments - DoE) and dynamic identification techniques for nonlinear multi-input systems is shown. The dynamics are excited by several amplitude-modulated pseudorandom-binary-signals (APRBS), which act on the engine simultaneously, in order to allow a short measurement time period. To show the applicability of the described identification and modelling methods several models for a common-rail diesel engine with exhaust gas recirculation and variable geometry turbocharger (VGT) are shown, with five input variables and the outputs nitrogen-oxide emissions, opacity, air-fuel ratio (Lambda) and exhaust gas temperature.

关键词： Engine control Diesel engines Dynamic modelling Engine dynamometer Nonlinear models Parameter estimation

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Stationary Global-Local Emission Models of a CR-Diesel Engine with Adaptive Regressor Selection for Measurements of Airpath and Combustion

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IFAC Proceedings Volumes 2010年第7期43卷 246-251页

作者： Heiko Sequenz Matthias Mrosek Rolf Isermann Institute of Automatic Control Laboratory of Control Engineering and Process Automation Technical University Darmstadt Germany

A model structure for stationary emission models is presented. The emissions NO x , soot and opacity are separately modeled. Model inputs are the air mass flow rate, charge air pressure, intake temperature, the location of mass fraction burned 50% and the engine operation point. Local polynomials are trained for each operation point, defined by engine speed and injection quantity. To increase accuracy a selection algorithm of the significant regressors is presented. The local models are composed by means of weighting functions, depending on the engine operation points, to global emission models. For a rasterized operation range, the weighting can be interpreted as a linear interpolation of local models. This enables an easy implementation to common electronic control units (ECUs). Measurements from a CR-Diesel engine show the quality of the models.

关键词： Automotive Emissions Local Regression Subset Selection Parametric Identification Algorithm Stationary Emission Models

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Event-based reduced-attention predictive control for nonlinear uncertain systems

Event-based reduced-attention predictive control for nonline...

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IEEE International Symposium on Computer-Aided control System Design

作者： Varutti, P. Faulwasser, T. Kern, B. Kögel, M. Findeisen, R. Laboratory for Systems Theory and Automatic Control Institute for Automation Engineering Otto-von- Guericke University Magdeburg Germany

ISBN: (纸本)9781424453542

Event-based control is an alternative to traditional control where new measurements are sampled only if critical events occur. This not only allows to reduce the control effort but it satisfies nowadays application requirements, such for example reduction of information exchange, computational power, or energy consumption. The work in this field is, however, still sparse and only a few results are available. Properly choosing an event-detection logic can considerably improve the overall system's performance. We propose a control algorithm which makes use of a model-based triggering strategy to reduce the control effort (reduced-attention control), while guaranteeing robustness against bounded additive perturbations for nonlinear continuous time systems. In particular, we derive conditions which guarantee that asymptotic stability of the nominal system implies practical stability of the real one in a neighborhood of the origin. A continuous stirred tank reactor is used as a benchmark problem to show the effectiveness of the presented algorithm. © 2010 IEEE.

关键词： Asymptotic stability

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Optimal control over unreliable networks with uncertain loss rates

Optimal control over unreliable networks with uncertain loss...

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作者： Kögel, Markus J. Blind, Rainer Allgöwer, Frank Institute for Systems Theory and Automatic Control University of Stuttgart Stuttgart Germany Laboratory for Systems Theory and Automatic Control Institute for Automation Engineering Otto-von-Guericke University Magdeburg Magdeburg Germany Design and Optimization in Chemical and Biochemical Process Engineering International Max Planck Research School for Analysis Magdeburg Germany

ISBN: (纸本)9781424474264

In this work, we consider an optimal control problem for Networked control Systems (NCS), where the loop is closed via an unreliable network. In order to inform the controller about the fates of the control packets, the actuator sends acknowledgements to the controller. In this work, different types of acknowledgements are considered. Since all packets are send over a network, we consequently assume, that all packets can get lost, i.e. the measurement packets, the control packets as well as the acknowledgement packets. The loss of these packets is modeled by independent and identically distributed (iid) Bernoulli processes. Finally, we assume that the parameters of these loss processes are not known exactly. Using this setup, we derive bounds for the uncertainty in the loss rates. Moreover, we present an algorithm to design a sub-optimal controller which can tolerate a given amount of network uncertainties. © 2010 AACC.

关键词： Networked control systems

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Active fault tolerant control of an electro-hydraulic servo axis with a duplex-valve-system

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IFAC Proceedings Volumes 2010年第18期43卷 660-668页

作者： Beck Mark Schwung Andreas Muenchhof Marco Isermann Rolf TU Darmstadt Institute of Automatic Control Laboratory for Control Systems and Process automation 64283 Darmstadt Germany (Tel: +49-6151-162314) TU Darmstadt Institute of Automatic Control Laboratory for Control Theory and Robotics 64283 Darmstadt Germany (Tel: +49-6151-166283) TU Darmstadt Institute of Automatic Control Laboratory for Control Systems and Process automation 64283 Darmstadt Germany (Tel: +49-6151-163114) TU Darmstadt Institute of Automatic Control Laboratory for Control Systems and Process automation 64283 Darmstadt Germany (Tel: +49-6151-162114)

关键词： Fault Detection Fault Diagnosis Fault Tolerance Fault Accomodation Electro-hydraulic Servo Axis Duplex-valve-system Active Fault Tolerant control Reconfiguration Bumpless-Transfer

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Installation effects of ultrasonic flowmeter in single bend pipe

Installation effects of ultrasonic flowmeter in single bend ...

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15th International Flow Measurement Conference 2010, FLOMEKO 2010

作者： Zheng, Dan-Dan Zhang, Tao Sun, Li-Jun Meng, Tao Hu, He-Ming Wang, Chi Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China National Institute of Metrology of China Beijing 100013 China

ISBN: (纸本)9781617824722

The downstream flow of 90° single bend was investigated by computational fluid dynamics (CFD). An acoustic transit time flowmeter was exposed to the downstream flow at various positions. Measurement errors with different meter configurations and effects of pipe wall roughness were discussed. Numerical simulation results of three diameter pipes 0.1m, 1m and 10m with increasing the roughness from 0 to 1mm were presented within Reynolds number (Re) range from 5× 103 to 5×106. Copyright © FLOMEKO 2010.

关键词： Flow measurement

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Low-complexity polynomial approximation of explicit MPC via linear programming

Low-complexity polynomial approximation of explicit MPC via ...

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作者： Kvasnica, Michal Löfberg, Johan Herceg, Martin Čirka, L'Uboš Fikar, Miroslav Automatic Control Laboratory Linköpings Universitet Linköpings Sweden Faculty of Chemical and Food Technology Institute of Information Engineering Automation and Mathematics Slovak University of Technology Bratislava Slovakia

ISBN: (纸本)9781424474264

This paper addresses the issue of the practical implementation of Model Predictive controllers (MPC) to processes with short sampling times. Given an explicit solution to an MPC problem, the main idea is to approximate the optimal control law defined over state space regions by a single polynomial of pre-specified degree which, when applied as a state-feedback, guarantees closed-loop stability, constraint satisfaction, and a bounded performance decay. It is shown how to search for such a polynomial by solving a single linear program. © 2010 AACC.

关键词： Polynomial approximation

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Simulation and test of backscattering from nonspherical soot particles swarm using laser

Simulation and test of backscattering from nonspherical soot...

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2010 Academic Symposium on Optoelectronics and Microelectronics Technology and 10th Chinese-Russian Symposium on Laser Physics and Laser Technology, RCSLPLT/ASOT 2010

作者： Xing, Jian Zhao, Jiaqun Liu, Yang Sun, Xiaogang College of Science Harbin Engineering University Harbin China State Key Laboratory of Tunable Laser Technology Harbin Institute of Technology Harbin China Harbin Institute of Technology Insititute of Automatic Detecting and Process Control System Harbin China

ISBN: (纸本)9781424455133

When the backscattering method is adopted to test the concentration and the size of soot, it's very important to analyze the backscattering characteristics of soot to determine the optimal light source, detector and detection angle. In this paper, the backscattering characteristics of nonspherical soot particles swarm are investigated. The size and shape of soot particles are determined by microscopic measurement. According to the micrograph, both Ellipsoid model and generalized Chebyshev models are selected to imitate soot particles. With the Monte-Carlo method, a random oriented particles swarm is created, and backscattering relative intensity is calculated by T-matrix method with different parameters. A simple backscattering test system was established, in which the light source and detector are selected based on the calculation results. The numerical and experimental results show that the combination of the Monte- Carlo method and the T-matrix calculation can be successfully applied to simulate the backscattering of the nonspherical particles swarm, and the experimental system has higher backscattering intensity according to simulation result. It provides a reference for improving the measurement accuracy of particles size and concentration. © 2010 IEEE.

关键词： Backscattering

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Optimal control over Unreliable Networks with Uncertain Loss Rates

Optimal Control over Unreliable Networks with Uncertain Loss...

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American control Conference

作者： Markus J. Kogel Rainer Blind Frank Allgower Laboratory for Systems Theory and Automatic Control Institute for Automation Engineering Otto-von-Guericke University Magdeburg Magdeburg Germany Institute for Systems Theory and Automatic Control University of Stuttgart Stuttgart Germany

ISBN: (纸本)9781424474264

关键词： Communication Networks Optimal control Networked control Systems TCP/UDP Unreliable Parameters Optimal control Packet Networked control systems networks(communications) controllers

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