Railway operations control systems primarily have the task to ensure safe but efficient operation. This paper shows an approach to model these systems in two general steps: In the first step an analysis of existing systems leads to the definition of generic functions. In the second step follows the construction of the control system model. The functions are classified in functions for protection, supervision of operation and optimisation. These functions are modelled as functional blocks, independent from any implementation of a specific train control system. By means of these functions, a new train control system can be modelled, simulated and analysed. The method presented here is a part of the framework BASYSNET (The Braunschweig Methodology for Description, Analysis, SYnthesis of Systems based on Petri NETs) which is based on Petri nets as means of description. As a case study for the modelling and simulation of a low cost train protection support system for secondary lines with satellite-based localisation has been used. The purpose of the approach presented here is to create a model of train control systems related to their functionality, but independent from their physical implementation. This allows to compare different functionalities and to decide which functional modules of existing systems can be reused. The long-term aspect is to create an architecture for the migration of these systems, that contains two aspects: The aspect of technical migration which concerns the evolution of the technical platform. The second aspect is the operational migration which concerns the evolution of rules and laws for the railway operation. The modularization helps to limit the effects of changes in the operation and to identify the reusable modules and components. A differentiation between technical components which are e.g. localisation or communication subsystems and functional modules like braking curve supervision or standstill supervision is helpful to establish an architecture with interfaces for the technical components. The second section contains a description of the basic concept of BASYSNET concerning means of description, method and tool as well as the description of the life-cycle, which has been applied here. The application specific method for the domain of railway control will be discussed in the third section. One application example of a low cost train protection support system will be shown in the fourth section. The last section contains the conclusion and perspective.
Functional modelling and simulation of train control systems
2003
18 Seiten, 11 Bilder, 19 Quellen
Conference paper
English
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