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Nonlinear process Identification and Predictive control by the Weighted Sum of Multi-Model Outputs

IFAC Proceedings Volumes 2003年第18期36卷 129-134页

作者： U. Schmitz R. Haber R. Bars Department of Plant and Process Engineering Laboratory of Process Control University of Applied Science Cologne D-50679 Köln Betzdorfer Str. 2 Germany fax: +49-221-8275-2836 Department of Automation and Applied Informatics Budapest University of Technology and Economics H-1111 Budapest Goldmann Gy. tér 3. Hungary fax : +36-1-463-287l

Most industrial processes are nonlinear. In such a case only a nonlinear model valid for the whole working area can ensure a good controller design. The nonlinear process is approximated by a multi-model consisting of the intelligent combination of some linear sub-models. As a very practical way the following identification strategy was used: independent model parameter estimation in the different working points and the calculation of the global valid model output as the weighted sum of the sub-models. As a weighting function the Gaussian function is used. The parameters of the Gaussian function were chosen either without or with optimization of the identification cost function. The global valid nonlinear model was used for model based predictive control. A heat exchanger example illustrates the method.

关键词： process identification nonlinear models predictive control multi-model heat exchanger

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Hybrid IMC Dead-Beat controller Design in Delta Domain

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IFAC Proceedings Volumes 2003年第18期36卷 381-386页

作者： Zs. Preitl R. Bars I. Vajk R. Haber Department of Automation and Applied Informatics Budapest University of Technology and Economics. MTA-BME Control Research Group H-1111 Budapest Goldmann Gy. tér 3. Hungary: fax : + 36-1-463-2871 Department of Plant and Process Engineering University of Applied Science Cologne Germany

The paper presents a control system design technique in delta domain for IMC (Internal Model control) structure. Also a generalised form for delta domain Dead-beat control algorithm is given, a hybrid implementation of the controller (Z-domain combined with delta domain) is presented and its architecture is compared with the pure deltadomain implementation. The effect of placing the limitations in the IMC structure is also studied. The hybrid control structure is compared with a similar Dead-beat controller in Z-domain for second and third order plants (benchmarks). An illustrative sensitivity analysis between the hybrid control system and the Z-domain system has been performed.

关键词： controller design delta domain generalised hybrid Dead-beat controller sensitivity analysis

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On the application of multimedia in control and automation

On the application of multimedia in control and automation

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4th IEEE International Caracas Conference on Devices, Circuits and Systems, ICCDCS 2002

作者： Moller, R. Automation and Process Control Engineering University of Wuppertal Dept. of Electrical Engineering Germany

ISBN: (纸本)0780373804

The degree of machine automation is continuously increasing, because computer technology, control software, telecommunication technology and visualization systems are also continuously improved. This makes the use of new multimedia techniques for reading, communication and presentation of machine or process data possible, even over far distances. Multimedia communication is becoming a technology of growing importance for user interfaces in automation and process control. Think of acoustic and visual data obtained from microphones or cameras applied to a certain automated system. They can be simply used and understood as a new brand of sensors or actuators that are part of a process control unit. Supervising and monitoring of certain process states is simplified, if the operator can "see" and "hear" the real process. Technical aspects concerning types, quality and speed of multimedia data communication will be discussed and especially viewed for an implementation in automated systems. © 2002 IEEE.

关键词： automation

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Synthesis of plantwide quality prediction system for a sintering plant 15th

Synthesis of plantwide quality prediction system for a sinte...

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15th World Congress of the International Federation of Automatic control, 2002

作者： Langer, Michael Vogel, Birgit University Wuppertal Automation and Process Control Engineering Fuhlrottstraße 10 Wuppertal42119 Germany

ISBN: (纸本)9783902661746

To substantially improve operational control of complex industrial plants, it is important to be able to predict the influences which process variables have on quality-relevant target variables. The determination of influencing relationship and also the delay-time behaviour of various industrial processes makes it difficult to synthesis a quality prediction system. A hybrid modeling method combined with a suitable classification of process characteristics ensures a widespread model synthesis for quality prediction. Copyright © 2002 IFAC.

关键词： process control

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Data fusion for precise dead-reckoning of passenger cars 15th

Data fusion for precise dead-reckoning of passenger cars

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15th World Congress of the International Federation of Automatic control, 2002

作者： Kochem, M. Wagner, N. Hamann, C.-D. Isermann, R. University of Technology Darmstadt Institute of Automatic Control Laboratory for Control Engineering and Process Automation Germany Adam Opel AG Rüsselsheim Germany

ISBN: (纸本)9783902661746

This paper investigates the possibility of computing the actual position of a passenger car based on different independent internal signals available in a production car. A new front wheel based dead reckoning approach is compared to a model based approach as well as to an Extended Kalman Filter. Depending on the method the input signals are the wheel revolutions of the front wheels, the steering angle and the yaw rate. Experimental results show the quality of all three algorithms compared to position data obtained by a DGPS system and also to the well known rear wheel based dead reckoning approach. Copyright © 2002 IFAC.

关键词： Sensor data fusion

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Semi-physical modelling of nonlinear processes by means of local model approaches 15th

Semi-physical modelling of nonlinear processes by means of l...

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15th World Congress of the International Federation of Automatic control, 2002

作者： Töpfer, Susanne Wolfram, Armin Isermann, Rolf Darmstadt University of Technology Institute of Automatic Control Laboratory for Control Engineering and Process Automation Landgraf-Georg-Strasse 4 DarmstadtD-64283 Germany

ISBN: (纸本)9783902661746

For many practical applications, a combination of theoretical and experimental modelling appears feasible. Qualitative knowledge about the most significant effects are often known or easily accessible. This contribution suggests a semi-physical modelling approach based on the special architecture of local models. Due to their inherent transparency, these models are very well suited for the incorporation of mainly qualitative process knowledge. The integration of prior knowledge is realised by an adaptation of the model structure to that one of the process. As a result, the final process-specific models are characterised by high generalisation performance also in situations with only few measurement data. Copyright © 2002 IFAC.

关键词： Fuzzy neural networks

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A model based supervision system for the hydraulics of passenger car braking systems 15th

A model based supervision system for the hydraulics of passe...

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15th World Congress of the International Federation of Automatic control, 2002

作者： Straky, Harald Münchhof, Marco Isermann, Rolf Institute of Automatic Control Laboratory of Control Engineering and Process Automation Darmstadt University of Technology Landgraf-Georg-Str. 4 DarmstadtD-64283 Germany

ISBN: (纸本)9783902661746

This paper presents the design of a model-based supervision and diagnosis system for hydraulic and future electro-hydraulic passenger car braking systems. A state space model of the braking system has been derived, which allows calculation of the individual wheel brake cylinder pressures as well as the amount of brake fluid consumed due to faults in the braking system. Based on this model, a real-time supervision system has been developed, which allows early detection and diagnosis of leakages and air entrapments in the hydraulic subsystem. This supervision system only requires data of sensors which are already available in modern passenger cars. Copyright © 2002 IFAC.

关键词： Fault detection

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SYNTHESIS OF PLANTWIDE QUALITY PREDICTION SYSTEM FOR A SINTERING PLANT

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IFAC Proceedings Volumes 2002年第1期35卷 71-76页

作者： Michael Langer Birgit Vogel University Wuppertal automation and process control engineering Fuhlrottstraße 10 42119 Wuppertal Germany

关键词： process control Neuro-Fuzzy modeling design simulation

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On the application of multimedia in control and automation

On the application of multimedia in control and automation

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IEEE International Caracas Conference on Devices, Circuits and Systems

作者： R. Moller Automation and Process Control Engineering Department of Electrical Engineering University of Wuppertal Germany

关键词： Automatic control automation Communication system control Telecommunication control Multimedia communication process control Application software Telecommunication computing control systems Data visualization

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Accurate local vehicle dead-reckoning for a parking assistance system

Accurate local vehicle dead-reckoning for a parking assistan...

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American control Conference (ACC)

作者： M. Kochem R. Neddenriep R. Isermann N. Wagner C.-D. Hamann Institute of Automatic Control Laboratory for Control Engineering and Process Automation Germany Institute of Automatic Control Laboratory for Control Engineering and Process Automation University of Technology Netherlands International Technical Development Center(ITDC) Adam Opel AG Germany

Investigates the possibility of computing position estimates for passenger cars based only on signals available in a production car. Two new dead reckoning approaches are compared to the well known rear axle based algorithm. One method combines the wheel revolution data calculated on the basis of raw ABS-signal measurements with the steering angle measurement. The other model based algorithm computes the position estimates using velocity and also steering angle measurement. For this approach the well known tricycle model has been extended by an object-oriented front axle model. Both newly proposed methods perform superior to the simple rear axle based algorithm and provide position data precise enough for control purposes. This was shown by experiments using a real car in connection with a real-time signal processing environment.

关键词： Vehicles Signal processing algorithms Axles Object oriented modeling Goniometers Production Dead reckoning Wheels Position measurement Velocity measurement

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