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Ewolucja wymiany danych w systemach pokładowych pojazdów

100%

Wawrzyński M.

tom No. 47

143--154

Pokładowe systemy wymiany danych ewoluują wraz z rozwojem środków transportu. Stanowią one specjalizowane konstrukcje stworzone od podstaw w celu spełnienia specyficznych zadań jakie stawiają przed nimi nowoczesne układy sterowania. W artykule przedstawiono podstawowe kroki milowe w ewolucji magistral telekomunikacyjnych w pojazdach od początku ich powstania po dzień dzisiejszy z zaznaczeniem obszarów, które stanowią punkt wyjścia w nowych kierunkach ich rozwoju.

On-board data exchange systems evolve with the development of vehicles. These are specialized constructions created from scratch to meet the specific tasks of modern control systems. The article presents the basic milestones in the evolution of telecommunications buses in vehicles from the beginning of their creation to the present day with the identification of areas that are the starting point in new directions of their development.

Verification of FlexRay start-up mechanism by timed automata

94%

Malinský J. , Novák J.

Metrology and Measurement Systems

2010

tom Vol. 17, nr 3

461-480

This contribution deals with the modelling of a selected part of a new automotive communication standard called FlexRay. In particular, it focuses on the mechanism ensuring the start-up of a FlexRay network. The model has been created with the use of timed automata and verified. For this purpose the UPPAAL software tool has been used that allows the modelling of discrete event systems with the use of timed automata, and subsequently the verification of the model with the use of suitable queries compiled in the so called computation tree logic. This model can be used to look for incorrect settings of time parameters of communication nodes in the network that prevent network start-up and subsequently the start of the car. The existence of this model also opens the way for finding possible errors in the standard. On the basis of the model, the work gives a case study of the start-up mechanism behaviour verification in a FlexRay network consisting of three communication nodes.

The flexray networks in the modern motorcars

83%

Śmieja M.

tom Vol. 17, No. 3

431-435

Advancing the evolution of motor cars, understood as complex mechatronic systems are connected with the ever emerging constrains on coordination between the components of the system objects. Adopted by all environment related to the automotive, the way of communication between the vehicle components via network for data exchange, connected with the necessity to keep up with increasing demands on the transmission speed and level of security. The answers to these requirements concerning the ways to control x-by-wire or complex mechanism to optimize the operation of the engine, seems to have been created by the big automobile companies FlexRay protocol. The article presents the basie features of this method of communication that allows for a 10 fold increase in data rates compared to the conventional CAN network. The remaining features of transmission such as reliability and level of time determinism, which are important for control systems are discussed later in the paper. Included in the summary comments indicate potential further developments and the possibilities of the application if this method of transmission in automotive applications.