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systems Engineering of Time-Triggered Architectures - The Setta Approach +

IFAC Proceedings Volumes 2000年第30期33卷 39-44页

作者： C. Scheidler P. Puschner S. Boutin E. Fuchs G. Graensteidl Y. Papa-dopoulos M. Pisecky J. Rennhack U. Virnich DaimlerChrysler TU Vienna Renault Dependable Computer Systems Alcatel Austria University of York TTTech EADS Airbus Siemens

SETTA addresses the systems engineering of safety-critical distributed real¬time systems with a special focus on time-triggered architectures. An innovative meth¬odology and a corresponding engineering environment is developed which aims for a higher maturity at early development steps. Key features are the support for a virtual systems integration and the tighter interconnection between the functional development process and the safety analysis process. The supporting tool components are designed and implemented in the course of the SETTA project. The methodology is evaluated by pilot applications from the automotive, aerospace, and railway domain.

关键词： systems Engineering distributed computer control systems Real-Time systems Safety-Critical systems Fault-Tolerant systems Verification Validation Automotive control Aerospace control Railways

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An Internet Based On-Line Architecture for Real-Time Traffic systems control

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IFAC Proceedings Volumes 2000年第9期33卷 287-292页

作者： Srinivas Peeta Raghubhushan Pasupathy Shyam Gedela School of Civil Engineering Purdue University West Lafayette. IN 47907 Phone: (765) 494-2209 Fax: (765)496-1105 School of Civil Engineering Purdue University West Lafayette. IN 47907 Phone: (765)494-2206 Fax: (765)496-1105 School of Civil Engineering Purdue University West Lafayette IN 47907 Phone: (765) 494-2206 Fax:(765) 496-1105

Recent advances in information technology provide opportunities for secure, efficient and economical data transfer vis-à-vis real time operations for large-scale traffic systems equipped with sensor systems. This paper describes an Internet based control architecture that provides an automated mechanism for real-time route guidance using a high performance computing environment located at a remote site. A distributed computing paradigm called the Beowulf Cluster is proposed to achieve a high performance computing environment for the on-line architecture.

关键词： On-line control distributed computer control systems Fault tolerance

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ACRuDA

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IFAC Proceedings Volumes 2000年第30期33卷 33-37页

作者： Odd Nordland SINTEF Telecom and Informatics Systems Engineering and Telematics NO-7465 Trondheim URL: www.informatics.sintef.no/-nordland

Rail traffic is controlled by a set of interlocking computers distributed within the railway network and on-board computers on the trains. The safety assessment and validation of such computers shall not depend on the system architecture, so common assessment criteria are needed. The ACRuDA project consisted of identifying the state of the art, defining a common method and common criteria for assessment, applying them in case studies and refining them in the light of the case study experiences. The project succeeded in defining a common set of criteria that are applicable to all currently implemented digital architectures.

关键词： distributed computer control systems Railways Safety

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Progressive domain focalization in intelligent control systems

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control ENGINEERING PRACTICE 1999年第5期7卷 665-671页

作者： Sanz, R Alarcón, I Segarra, M Clavijo, M de Antonio, A Univ Politecn Madrid E-28006 Madrid Spain Univ Autonoma Madrid E-28049 Madrid Spain

Advanced information-processing technologies are providing advanced controllers with capabilities to tackle control problems of intrinsic complexity. Methods to cope with the difficulties of software-intensive control system development are needed, because quality issues in control software are of extreme importance. Architecture-based development provides a clear pathway to controller quality, focusing on component-based control system development. In the case of intelligent controllers, advanced control modules (expert, fuzzy, neural, etc.) can be built to be reusable. In the ideal situation, application construction would be a matter of merely plugging the controllers into an architectural framework, followed by a simple customization. (C) 1999 Elsevier Science Ltd. All rights reserved.

关键词： intelligent control industrial process control architectures software engineering distributed computer control systems

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Intelligent control of the Fed-Batch Fermentation Process

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IFAC Proceedings Volumes 1999年第2期32卷 7596-7601页

作者： Feng Pan Webo Xu Ling Xu Shiyi Lun Jian Chen School of Information and Automation Engineering Wuxi University of Light Industry Wiux 214036 Jiangsu P.R. China Fax: (86-510) 3201770 School of Biotechnology Wuxi University of Light Industry Wiux 214036 Jiangsu P.R. China Fax: (86-510) 3201770

A distributed computer control system (FC-2) for fermentation process is introduced in this paper. The development and application of a real-time intelligent control system to provide supervisory control of fed-batch fermentation is presented. The system performs sensor fault detection and diagnosis, the application of artificial neural network to the estimation and prediction of fermentation process variables, and fermentation process optimization. Basing on the intelligent control strategies for the production process of L-lysine fermentation, more economic profile is obtained by industrial application.

关键词： Intelligent control distributed computer control systems expert systems neural networks optimization fermentation processes

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Distributing control systems Using Active Rules 1

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IFAC Proceedings Volumes 1999年第1期32卷 89-94页

作者： Sten F. Andler Joakim Eriksson Mats Lundin University of Skövde Sweden Volvo AB Sweden

Real-time control systems are often distributed, with complex data sharing requirements. A method is proposed using a distributed real-time database, extended with active rules that react to changes in the system. This database is fully replicated and nodes communicate using only the database distribution facilities. Temporal constraints at individual nodes may be met at the expense of temporary inconsistencies in the database. This paper investigates the effects of using a rulebased representation and the replicated database as a distribution mechanism for certain classes of real-time systems. Particular attention is paid to the effect of reduced consistency, assuming eventual consistency.

关键词： Real-time systems distributed databases distributed computer control systems control system design database systems data replication consistency distribution control active database real-time database

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An integrated framework for development of real-time distributed control software based on can-bus

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IFAC Proceedings Volumes 1999年第2期32卷 8710-8715页

作者： Marga M. Marcos Julian M. Bass Javier Portillo P.J. Fleming Dept Ingenierie'a de Sistemas y Automática Univ. of the Basque Country Spain Tel -34 94 4 2 7 80 55 Fax 34 94 441 40 41 School of Electronic Engineering and Computer Science Univ. of Wales Bangor UK Dept. of Automatic Control and Systems Eng. Univ. of Sheffield UK Associate Professor in Control Engineering

Embedded systems are computer-based systems which must respond to external stimuli within time scales determined by the external environment. Such systems are required to achieve ever more demanding behavioural. performance and safety requirements. Embedded systems are found in applications such as primary flight control, gas-turbine engine control and railway traffic management Often complex embedded systems are distributed, typically to achieve demanding performance or dependability requirements, and must operate within hard real-time constraints. Considerable effort is required to select optimal design solutions and ensure adherence to specified requirements. In embedded systems safety, reliability and response-times are considered as strict constraints on the system design. Achievement of these constraints requires meticulous analysis, typically through the use of specialist modelling and simulation techniques. Integration of knowledge and understanding obtained from disparate detailed models remains a considerable challenge. Ideally, a system which has both continuous dynamics and event-driven parts. would be modelled in one environment, using the most appropriate techniques for each part, and allowing the analysis of the whole system to be carried out simultaneously. The paper presents an integrated approach in order to translate automatically the information manipulated during the different phases of the design: specification. analysis, design and implementation.

关键词： distributed computer control systems state charts real time systems software tools fieldbus

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Implementation of Train Communication Network for Korean High Speed Train (KHST)

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IFAC Proceedings Volumes 1999年第2期32卷 8231-8236页

作者： Jaehyun Park Taerim Park Department of Automation Engineering Inha University Incheon 402-751 Korea

This paper describes the efforts to implement TCN(train communication network) standardized by IEC for the Korean high speed train. The performance is measured and the problem of worst case communication latency not in data link layer but application layer is showed. In order to reduce the latency, new method is proposed and showed the enhanced performance. For the real-time control network systems like TCN, the end-to-end latency analysis and measurement is one of the most important work to be adopted in real area. In this paper, the latency measurement results are described and a new algorithm is proposed to reduce the latency.

关键词： Real-time communication train control distributed computer control systems

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A distributed expert control system for a hydrometallurgical zinc process

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control ENGINEERING PRACTICE 1998年第12期6卷 1435-1446页

作者： Wu, M Nakano, M She, JH Tokyo Engn Univ Dept Mech Tokyo 1928580 Japan Tokyo Inst Technol Dept Control & Syst Engn Tokyo 1528552 Japan

A distributed expert control system (DECSHZ) has been built for a hydrometallurgical zinc process, whose basic steps are leaching, purification and electrolysis. It consists of a central computer management system and three local expert control systems, one for each of the basic steps. This paper deals with the design and application of DECSHZ, especially its distributed architecture and main functions;expert control strategies based on rule models and a combination of rule models and steady-state mathematical models: system implementation;and the results of actual runs. DECSHZ has been found to provide not only a very pure product, but also significant economic benefits. (C) 1998 Elsevier Science Ltd. All rights reserved.

关键词： hydrometallurgical zinc processes expert systems distributed computer control systems process control rule models mathematical models

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Stochastic analysis and control of real-time systems with random time delays

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AUTOMATICA 1998年第1期34卷 57-64页

作者： Nilsson, J Bernhardsson, B Wittenmark, B Lund Inst Technol Dept Automat Control S-22100 Lund Sweden

The paper discusses modeling and analysis of real-time systems subject to random time delays in the communication network. A new method for analysis of different control schemes is presented. The method is used to evaluate different schemes suggested from the literature. A new scheme, using so-called timestamps, for handling the random time delays is then developed and successfully compared with previous schemes. The new scheme is based on stochastic control theory and a separation property is shown to hold for the optimal controller. (C) 1998 Elsevier Science Ltd. All rights reserved.

关键词： delay compensation distributed computer control systems real-time systems stochastic control stochastic parameters timing jitter

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