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Realizacja algorytmów sterowania ruchem drogowym w specjalizowanych sterownikach sprzętowych

Firląg K., Kawalec P.

Pomiary Automatyka Kontrola

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2010

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R. 56, nr 7

721-723

PL

W artykule przedstawiona została metoda projektowania urządzeń sterowania ruchem drogowym w formie sterowników specjalizowanych, realizowanych, jako jednoukładowe urządzenia typu SoC z wykorzystaniem układów FPGA. Metoda wykorzystuje hierarchiczne grafy przejść automatów skończonych FSM oraz modele strukturalne oparte na schematach ideowych. Przedstawiona metoda pozwala zarówno na modelowanie działania sterowników ruchu drogowego jak i realizację sprzętowych sterowników specjalizowanych.

EN

The paper indicates a key role of local traffic controllers in the system of road traffic control, emphasizing at the same time the increasing requirements for these devices resulting from constantly growing road traffic intensity [1]. The currently applied methods of road traffic control were analysed, focusing on modern methods of adaptive control in which control functions depend on the actual situation at the crossroads [8]. The paper shows the need for realisation of road traffic control devices in the form of specialised controllers realised as single-system devices of SoC type with use of programmable devices. Advantages of such realisation are pointed out.After the analysis of formal specification models of digital controllers, a finite automaton with FSM memory was chosen for realisation of a model controller. Additional extension of the model by hierarchization eliminated the model flatness (Fig. 3). There is presented a method of transition from adaptive traffic control algorithms applied to traffic control engineering (Fig. 1) to a specialised traffic controller model in VHDL language with use of finite automata hierarchical transition graphs (Fig. 5a) and structural models based on schematic diagrams shown in Fig. 6. The described method of realisation of road traffic control devices allows for both modeling of local controller operation and realisation of single-system specialised controllers.

2

Traffic control algorithms in computer networks. Part 2, Simulation researches of the algorithms

Barczak A., Sitkiewicz T.

Studia Informatica : systems and information technology

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2009

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Vol. 2(13)

5--19

EN

This article is the continuation of the first part entitled Review of algorithms. In the article presented were the author's simulator of a network and the tests performed with its help. In the first part the concept and functionality of the created simulator were described. The concept emerged on the basis of an analysis of existing solutions, as well as needs the created software has to fulfill. The second part of the article depicts the testing environment, i.e. network topology and simulation parameters used during the research. What is more, in the aforementioned part, provided was the comparison of the research run with the use of the author's software and its interpretation.

3

Review of traffic control algorithms in computer networks

Barczak A., Sitkiewicz T.

Studia Informatica : systems and information technology

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2008

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Vol. 2(11)

15--26

EN

This paper presents comparison of popular traffic control algorithms in computer networks. It also contains descriptions of functioning of these algorithms. The first part of this paper contains description of evaluation criteria of traffic control algorithms (from system and user viewpoint). The second part of article contains description of new algorithms, which are theoretically improved or brand new, just introduced for practical use. These algorithms are developmental and eliminate disadvantages of already existing algorithms. The third part of this paper contains description of classical algorithms, which are well known, described and researched. It contains also propositions of modifications of classical linear programming algorithms. These modifications are for adjusting these algorithms to described problem.