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Empresas e instituições de pesquisa nacionais e internacionais tem concentrado esforços no sentido de desenvolver e promover a implementação do padrão internacional ISO 11783, baseado no protocolo de comunicação digital CAN (Contoller Network Area), para integração de dispositivos em máquinas e implementos agrícolas. Nesse contexto, é apresentado o desenvolvimento e a aplicação de um modelo baseado no formalismo das redes de Petri como uma ferramenta de suporte para a análise e implantação de uma rede CAN em aplicações com tempos-críticos. O modelo foi elaborado no ambiente para edição e simulação DesignCPN, sendo que a simulação é utilizada para a análise do desempenho e do comportamento de uma rede CAN com diferentes configurações que será embarcada em um veículo autônomo agrícola (VAA). / Intemational and national research institutions and companies have focused efforts to develop and promote the implementation of the international standard ISO 11783, based upon the digital communication protocol CAN (Controller Area Network), in order to integrate devices in machines and agricultural implements. Therefore, it is presented the development and the application of a model based on Petri nets\' formalism as a tool for the support, analysis and accomplishment of a CAN bus in time-critical applications. The model was constructed in an environrnent for edition and sirnulation of colored Petri nets, the software DesignCPN. The sirnulation was used for the analysis of the behavior and the performance the CAN bus for several configurations, which will be embedded in an Autonomous Agricultural Vehicle (VAA).

Empresas e instituições de pesquisa nacionais e internacionais tem concentrado esforços no sentido de desenvolver e promover a implementação do padrão internacional ISO 11783, baseado no protocolo de comunicação digital CAN (Contoller Network Area), para integração de dispositivos em máquinas e implementos agrícolas. Nesse contexto, é apresentado o desenvolvimento e a aplicação de um modelo baseado no formalismo das redes de Petri como uma ferramenta de suporte para a análise e implantação de uma rede CAN em aplicações com tempos-críticos. O modelo foi elaborado no ambiente para edição e simulação DesignCPN, sendo que a simulação é utilizada para a análise do desempenho e do comportamento de uma rede CAN com diferentes configurações que será embarcada em um veículo autônomo agrícola (VAA). / Intemational and national research institutions and companies have focused efforts to develop and promote the implementation of the international standard ISO 11783, based upon the digital communication protocol CAN (Controller Area Network), in order to integrate devices in machines and agricultural implements. Therefore, it is presented the development and the application of a model based on Petri nets\' formalism as a tool for the support, analysis and accomplishment of a CAN bus in time-critical applications. The model was constructed in an environrnent for edition and sirnulation of colored Petri nets, the software DesignCPN. The sirnulation was used for the analysis of the behavior and the performance the CAN bus for several configurations, which will be embedded in an Autonomous Agricultural Vehicle (VAA).

International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada / To meet challenging constraints on telemetry system weight and volume, a custom Light-Weight Instrumentation System was developed to collect vehicle environment and dynamics on a short-duration exo-atmospheric flight test vehicle. The total telemetry system, including electronics, sensors, batteries, and a 1 watt transmitter weighs about 1 kg. Over 80 channels of measurement, housekeeping, and telemetry system diagnostic data are transmitted at 128 kbps. The microcontroller-based design uses the automotive industry standard Controller Area Network to interface with and support in-flight control functions. Operational parameters are downloaded via a standard asynchronous serial communications interface. The basic design philosophy and functionality is described here.

Tese de mestrado. Engenharia Electrotécnica e de Computadores. 2005. Faculdade de Engenharia. Universidade do Porto

Thesis (M.S.)--West Virginia University, 2007. / Title from document title page. Document formatted into pages; contains ix, 86 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 82-86).

<p>This report studies a low cost hardware platform for Fleet Management Services, FMS. The platform manages vehicle data, positioning and wireless communication. The core of the platform is a new kind of ‘intelligent’ GSM modem, called a GSM module. A GSM module is basically a stripped down mobile phone that allows embedded third party application code and has an IP-stack. The report reviews the modules available on the market today and presents experiences from the implementation of a prototype based on the Aplicom A12 module. The main conclusion is that the concept is feasible though the modules' limited performance must be considered in the design.</p>

<p>The aim of this Master’s thesis is to develop a solution for combining speed and performance of switched Ethernet with the real time capability and determinism of sophisticated in- vehicle networks. After thorough research in vehicle network standards, their demands and features, the</p><p>Flexible Time Division Multiple Access (FTDMA) protocol of FlexRay was chosen to be applied on a switched Ethernet architecture since it can accommodate both hard real time tasks and soft real time tasks. To provide hard real time capability, what this paper focuses on, a media access method was developed by creating static TDMA schedules for each node’s sending and receiving</p><p>port according to a certain traffic assumption. To validate the developed media access algorithm several examples with different traffic assumptions and architectures were generated and</p><p>investigated based on their sending and receiving utilization. A second method for validating and thus proving the functionality of the algorithm was by simulation. Therefore the Matlab Simulink</p><p>media library extension TRUE TIME was used to simulate a simple example with 100% sending and receiving utilization for each node.</p>

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