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* The design of hybrid systems is a difficult task. One has to consider many different aspects like data, behavior, architecture and distribution.
* Moreover it usually involves people from different engineering disciplines.
* Many modern SE methods like UML, ROOM and SDL recommend the use of visual specifications.
* In the projects BeQuest at TU Muenchen and CHARON at Upenn we developed HyCharts, a visual design language supporting the hierarchic specification of architecture and behavior of hybrid systems.
* The aim of this work is to complement HyCharts with HySequenceCharts, a visual requirements language supporting the hierarchic specification of interaction between hybrid systems.
Electronic Height Control System (BMW) (Informal Requirements Specification)
* Whenever the chassis level is below a certain bound, a compressor is used to increase it,
* If the level is too high, air is blown off by opening an escape valve,
* The chassis level is measured by sensors and filtered to eliminate noise,
* The filtered value is read periodically by a controller which operates the compressor and the escape valves and resets the filter when necessary,
* A sensor tells the controller whether the car is in bend (in a curve).
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