Modeling A Distributed Railway Interlocking
System With Object-oriented Petri Nets
Author(s)
X. Hei, H. Mochizuki, S. Takahashi, H. Nakamura, M. Fukuda,
K. Iwata & K. Sato
Abstract
Great progress of distributed technology and intelligent terminals makes it
possible to develop a distributed railway interlocking system (DRIS). In this
paper, a modelling method of DRIS is presented by using G-nets, which are Petri
nets extended with object-oriented concepts. The modelling method improves
maintenance and reusability remarkably. Based on the models, the DRIS can be
implemented with an object-oriented language such as C++ or JAVA.
Keywords: distributed technology, railway interlocking system, G-nets, Petri net.
1 Introduction
Computerized interlocking system has been developed for many years [1].
Conventional interlocking system, which is named electronic interlocking
system, is composed of central control computer, electrical control part and
mechanical part. These systems feature that cost is high and updating of terminal
devices is inconvenient.
On the other hands, study and application of distributed control technology
and field-control technology have become a new stage [2, 3]. Especially, with
the development of ubiquitous technology [4], intelligent terminals or intelligent
devices have been possible. All these progress make it possible developing
distributed railway interlocking system (noted as DRIS).
In distributed interlocking system, all devices are intelligent, and they
communicate with each other directly without centralized interlocking computer,
as shown in figure 1. All these intelligent devices have functionality units which
are shown in figure 2. The logics of DRIS also become different from centralized
interlocking system.
Keywords
distributed technology, railway interlocking system, G-nets, Petri net.
Related Book
Other papers in this volume
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