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- Stefan Kowalewski, Sebastian Engell, Jörg Preußig, Olaf Stursberg
- Automatica
- 1999

Subtitle-A modular and timed discrete event modeling framework is used to analyze the correct function of logic controllers for continuous processes in a rigorous manner. Abstract-An approach to the formal verification of logic controllers for processes with switched continuous dynamics is presented. The method builds on modular, timed discrete event models… (More)

- Stefan Kowalewski, Olaf Stursberg, +6 authors Heinz Treseler
- Hybrid Systems
- 1997

This case study compares the usefulness and applicability of eight computer tools with respect to the validation of logic control programs for continuous processes. Six simulation packages (Taylor's MATLAB-based simulator, SIMULINK/STATEFLOW, GPROMS, SHIFT, DYMOLA, and BASIP) and two verification tools (SMV and HYTECH) were applied to a single process… (More)

- Olaf Stursberg, Stefan Kowalewski, Ingo Hoffmann, Jörg Preußig
- Hybrid Systems
- 1996

We describe two approaches to derive Timed and Linear Hybrid Automata from continuous models given as systems of ordinary diierential equations. A semiquantitative modeling method is applied which yields a qualitative description of the system dynamics and quantitative bounds for the residence times in the discrete states or the state variable derivatives.… (More)

- Jörg Preußig, Olaf Stursberg, Stefan Kowalewski
- HSCC
- 1999

The paper presents a concept for the reachability analysis of switched continuous systems in which switching only occurs when the continuous state trajectory crosses thresholds defined by a rectangular partitioning of the state space. It combines an existing approach for approximating such systems by rectangular automata with an existing reachability… (More)

- Jörg Preußig, Stefan Kowalewski, Howard Wong-Toi, Thomas A. Henzinger
- FTRTFT
- 1998

Rectangular automata are well suited for approximate mod-eling of continuous{discrete systems. The exact analysis of these au-tomata is feasible for small examples but can encounter severe numerical problems for even medium-sized systems. This paper presents an analysis algorithm that uses conservative overapproximation to avoid these numerical problems.… (More)

- Sebastian Engell, Stefan Kowalewski, Bruce H. Krogh, Jörg Preußig
- EUROSIM
- 1995

- Stefan Kowalewski, Jörg Preußig
- TACAS
- 1996

This paper describes the use of timed Condition/Event (C/E) systems, a real-time extension of the C/E system framework introduced by Sreenivas and Krogh, for building models of chemical plants in a modular fashion and as a basis for the model-based analysis of their discrete control. The approach is illustrated by applying it to the safety control logic of… (More)

The paper describes a model-based approach to the formal verification of sequential control programs for chemical processes. It is assumed that the control software is represented as a Sequential Function Chart (SFC) which may include timing constraints for the control actions. The verification method is based on a timed Condition/Event (C/E) model of the… (More)

- Ralf Huuck, Yassine Lakhnech, Luis Urbina, Sebastian Engell, Stefan Kowalewski, Jörg Preußig
- Scalable Computing: Practice and Experience
- 1998

In this paper we integrate two diierent approaches for the speciication and veriication of timed systems being used in control theory and computer science. These are the timed condition/event systems and the timed automata formalisms. Our main result states that timed condition/event systems can be eeciently transformed into timed automata which then can be… (More)

- Jörg Preußig
- 2000