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Considerações do ambiente eletromagnético urbano na análise de interferências em veículos automotores. ; Regardings of the urban electromagnetic environment in the electromagnetic interference analysis of automobiles.

Santos, Gláucio
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 21/10/2002 PT
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26.51%
Em face da crescente dependência e utilização dos sistemas elétricos e eletrônicos nos veículos automotores modernos, ao se considerar os níveis de imunidade destes sistemas e a ampla variedade de fenômenos eletromagnéticos presentes nas cidades, deve-se destacar a importância da análise da influência do ambiente eletromagnético urbano nos estudos de compatibilidade eletromagnética (CEM) destes equipamentos. Diante deste cenário e devido à característica de mobilidade dos veículos automotores, este trabalho ressalta a importância da consideração da influência do ambiente eletromagnético (EM) de grandes centros urbanos na metodologia de análise de CEM em veículos e seus equipamentos embarcados. Assim, definiu-se como ambiente típico aquele relacionado às principais regiões urbanas do Brasil, com ênfase naquelas locali-zadas no Estado de São Paulo, selecionadas em função da severidade dos campos EM, tanto com relação à sua intensidade quanto à diversidade de fenômenos EM presentes. Neste trabalho são apresentados resultados práticos oriundos de diversas medi-ções, abrangendo regiões com características que variam de áreas residenciais e densamente povoadas, com grandes atividades comerciais e industriais...

Estudo de compensadores para a válvula borboleta eletrônica automotiva.; Study of compensator for automotive electronic throttle valve.

Guedes, Marcos Antonio de Carvalho
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 13/12/2013 PT
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46.35%
A válvula borboleta é o atuador principal do sistema de admissão de ar no motor a combustão interna ciclo Otto (MCI), determinando a massa de ar admitida para o sistema de gerenciamento eletrônico do motor (ECU) realizar os cálculos de controle da injeção eletrônica de combustível, e o momento de lançamento da centelha para o sistema de ignição eletrônica, atuando também no regime de funcionamento do MCI. Este trabalho explora o controle da válvula borboleta eletrônica automotiva, onde foram estudados diversos modelos de controle para a válvula borboleta. O controle visa responder a ECU que demanda um determinado ângulo de abertura da válvula borboleta, para o melhor funcionamento e gestão do MCI para cada região de operação do motor, sendo este ângulo de abertura determinado pela própria ECU. O principal objetivo do trabalho é buscar um melhor desempenho do controle da válvula borboleta, para responder com exatidão ao comando da ECU e, consequentemente, um desempenho ótimo do motor de combustão interna. Adicionalmente, o trabalho promove avanços parciais para o desenvolvimento de uma unidade eletrônica de gerenciamento do motor.; The throttle is the main actuator of the air intake system in an internal combustion engine Otto cycle (MCI)...

Critérios para seleção da arquitetura elétrica veicular em mercados emergentes.; Criteria for selection of vehicle electrical architectures for emerging markets.

Dal Poggetto, Gustavo
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 03/07/2009 PT
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26.64%
Este estudo tem por objetivo estabelecer os principais critérios de seleção de uma arquitetura elétrica adequada a mercados emergentes, considerando as necessidades de mercado, de legislação, de inovações e/ou novas funções a serem empregadas durante o ciclo de vida de um veículo. Para tanto, o resultado da pesquisa bibliográfica deste trabalho, apresentada na revisão teórica, primeiramente define o significado de arquitetura elétrica, e conta a sua evolução desde os primórdios da indústria automotiva até os dias de hoje, apontando quais são os principais sistemas elétricos existentes atualmente, deixando clara a fundamental importância da eletrônica embarcada na evolução do automóvel. Mostram, ainda, suas principais tendências tecnológicas, além de um descritivo sobre técnicas, critérios e metodologia de desenvolvimento de projetos de arquitetura elétrica empregados hoje na indústria. Na seqüência, o trabalho define os conceitos de mercado emergente e mercado desenvolvido, apontando suas particularidades, volumes de negócio (histórico e projetado), deixando evidente a importância dos mercados emergentes nos dias de hoje para a indústria automotiva mundial e a necessidade de se estabelecer estratégias específicas para estes mercados. Com base na própria pesquisa bibliográfica...

Sistemas de comunicação CAN FD: modelamento por software e análise temporal.; CAN FD communication systems: modeling software and temporal analysis.

Andrade, Ricardo de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 26/09/2014 PT
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36.6%
O CAN (Controller Area Network) é um padrão no barramento de comunicação, amplamente difundido em aplicações industriais, particularmente em sistemas automotivos. Atualmente, um dos principais problemas no ramo automotivo é que esse barramento está com muitas mensagens no barramento, resultado da incorporação incremental de sistemas eletrônicos em automóveis, visto que há uma exigência maior de conectividade devido às exigências da sociedade e mercado. Como alternativa, vem sendo desenvolvida uma nova rede de comunicação, conhecida como CAN with Flexible Data-Rate (CAN-FD), que é um barramento com velocidade de transmissão de informação mais alta e maior capacidade de transporte de dados. Este projeto tem por objetivo principal explorar as funcionalidades da rede CAN-FD, através de simulações do trânsito de mensagens numa rede CAN-FD usando os dados de uma rede real CAN, e verificando a previsibilidade de ambas no âmbito de um protocolo que possa atender à demanda de sistemas complexos. A comparação é executada a partir de um conjunto de mensagens adicionadas na rede, para verificar os limites de transmissão de cada uma das redes, e os respectivos tempos de atraso das mensagens. Como um segundo estudo de caso...

A 2.4-GHz CMOS short-range wireless-sensor-network interface for automotive applications

Carmo, J. P.; Mendes, P. M.; Couto, Carlos; Correia, J. H.
Fonte: IEEE Transactions Publicador: IEEE Transactions
Tipo: Artigo de Revista Científica
Publicado em 01/05/2010 ENG
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This paper describes a CMOS interface for shortrange wireless sensor networks (CMOS-SRWSN interface). The sensor interface is composed of a sensor readout, electronics for processing and control, a memory, a radio-frequency CMOS transceiver for operation in the 2.4-GHz industrial, scientific, and medical bands, and a planar antenna. The receiver has a sensitivity of −60 dBm and consumes 6.3 mW from a 1.8-V supply. The transmitter delivers an output power of 0 dBm with a power consumption of 11.2 mW. The application of the CMOS-SRWSN interface is in the automotive industry for the reduction of cables and to support the information, communication, and entertainment systems in cars..

Can formal methods make automotive business sense? A classification of formal methods

McElligott, Pat; Mjeda, Anila; Thiel, Steffen
Fonte: SAE International Publicador: SAE International
Tipo: info:eu-repo/semantics/conferenceObject; all_ul_research; ul_published_reviewed
ENG
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peer-reviewed; Legislative bodies are directing that automotive products comply with stringent safety levels. The liability for the safety of passengers in an automobile has traditionally been quite complex. Other transport sectors are externally regulated, and liability lies with the manufacturer or the transport service provider. The automotive industry is self-regulated and the individual driver carries a significant liability. Software and electronics increasingly provide greater control of automotive safety, possibly reducing driver liability, and increasing the need for more formal software development methods. The automotive business model, however, also presents challenges to the effective use of formal methods. An automotive design change costing €600 per vehicle could consume 100% of gross margin. In aviation, this cost represents 0.01% of gross margin. [1] [2]. The automotive industry is responding to the increasing impact of automotive software with the development of standards such as AUTOSAR [3], and EU funded projects such as ATESST [4] and EASIS [5]. They propose architectures which might deliver the benefits of best software engineering practice to the industry. In terms of safety, they recommend existing accepted standards such as IEC61508 [6]...

Global Value Chains in the Electronics Industry : Was the Crisis a Window of Opportunity for Developing Countries?

Sturgeon, Timothy J.; Kawakami, Momoko
Fonte: Banco Mundial Publicador: Banco Mundial
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This paper presents evidence of the importance of electronics global value chains (GVCs) in the global economy, and discusses the effects of the recent economic crisis on the industry. The analysis focuses on how information is exchanged and introduces the concept of "value chain modularity." The authors identify three key firm level actors -- lead firms, contract manufacturers, and platform leaders -- and discuss their development, or "co-evolution" in the context of global integration. Company, cluster, and country case studies are then presented to illustrate how supplier capabilities in various places have developed in the context of electronics global value chains. The findings identify some of the persistent limits to upgrading experienced by even the most successful firms in the developing world. Four models used by developing country firms to overcome these limitations are presented: (1) global expansion though acquisition of declining brands (emerging multinationals); (2) separation of branded product divisions from contract manufacturing (original design manufacturing (ODM) spinoffs); (3) successful mixing of contract manufacturing and branded products (platform brands) for contractors with customers not in the electronic hardware business; and (4) the founding of factory-less product firms that rely on global value chains for a range of inputs...

Republic of India Manufacturing Plan Implementation

Ernst, Dieter
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Tipo: Trabalho em Andamento
EN_US
Relevância na Pesquisa
26.44%
This set of reports on manufacturing plans implementation in India includes the following: (1) A new agenda. Improving the competitiveness of the textiles and apparel value chain in India report is structured as follows: section one sets out the context, describing trends in global markets and in the textiles and apparel supply chain in India; section two analyzes in detail the choke points that are hindering the growth of the latter; section three sets out a reform agenda to address them; and section four concludes. (2) Fast tracking Indias electronics manufacturing industry. Business environment and industrial policy examines the prospects for India to meet its potential. Drawing on extensive survey questionnaires and interviews with key industry players (both domestic and foreign) and relevant government agencies, this study identifies major challenges India-based companies face in engaging in electronics manufacturing. The analysis culminates in detailed policy suggestions for regulatory reform and support policies needed to unblock barriers to investment in this industry and to fast-track it’s upgrading through innovation. (3) Supply chain delays and uncertainty in India. The hidden constraint on manufacturing growth report provides the context of the freight and logistics industry in India; describes the headline impacts of its performance on manufacturing firms; explores variations in this impact and causes thereof; and concludes with a more detailed look at the reform agenda this motivates.

Inverterless high-power interior permanent-magnet automotive alternator

Soong, W.; Ertugrul, N.
Fonte: IEEE-Inst Electrical Electronics Engineers Inc Publicador: IEEE-Inst Electrical Electronics Engineers Inc
Tipo: Artigo de Revista Científica
Publicado em //2004 EN
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46.35%
This paper describes a high-power brushless interior permanent-magnet (PM) automotive alternator which does not use an inverter. The “inverterless” alternator is designed with a high back electromotive force voltage and high reactance, and acts as a constant current source over much of its wide constant power operating speed range. In this configuration, a switched-mode rectifier can be used to regulate the dc output voltage and current, which avoids the complexity and high cost of an inverter. An analysis of the modeling and performance of interior PM machines in this inverterless topology is described. Experimental results showing an outstanding constant power speed range are presented for a 6-kW concept demonstrator machine tested using a three-phase resistive load to simulate inverterless operation.; Wen L. Soong and Nesimi Ertugrul

Iron loss reduction in an interior PM automotive alternator

Zivotic-Kukolj, V.; Soong, W.; Ertugrul, N.
Fonte: IEEE-Inst Electrical Electronics Engineers Inc Publicador: IEEE-Inst Electrical Electronics Engineers Inc
Tipo: Artigo de Revista Científica
Publicado em //2006 EN
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This paper examines the iron loss characteristics of a high-flux interior permanent-magnet machine. The machine was designed as a concept demonstrator for a 6-kW automotive alternator and has a wide field-weakening range. Initial experimental results revealed a high iron loss during field-weakening operation. Finite-element analysis was used to investigate the cause of the high iron losses and to predict their magnitude as a function of speed. The effects of changes in the machine design were examined in order to reduce iron losses and hence improve the machine performance.; Vlatka Životi´c-Kukolj, Wen L. Soong, and Nesimi Ertugrul; Copyright © 2006 IEEE

Investigation of interior permanent magnet offset-coupled automotive integrated starter/alternator

Soong, W.; Ertugrul, N.; Lovelace, E.; Jahns, T.
Fonte: IEEE - Institute of Electrical and Electronics Engineers Publicador: IEEE - Institute of Electrical and Electronics Engineers
Tipo: Conference paper
Publicado em //2001 EN
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36.24%
Growing automotive auxiliary electric power requirements have resulted in considerable interest in an integrated starter/alternator (ISA). Initial efforts in this area have been focussed on a direct-drive ISA configuration which offers an appealing degree of mechanical simplification. However, an offset-coupled ISA configuration similar to that used by the conventional alternator has potential for providing a better system solution in some applications, including lower total system cost. This paper first describes the design, construction and dynamometer testing of a concept demonstrator of an offset-coupled ISA using an interior permanent magnet (IPM) synchronous machine. Next, a nonlinear lumped-circuit analysis tool is used to investigate optimized offset-coupled IPM ISA drive designs. Finally, comparisons are presented between an existing direct-drive IPM ISA design and the optimized offset-coupled designs.; © Copyright 2001 IEEE

Software product line engineering in automotive systems engineering

Thiel, Steffen; O'Brien, Liam; Ali Babar, Muhammad; Botterweck, Goetz
Fonte: SAE Publicador: SAE
Tipo: info:eu-repo/semantics/conferenceObject; all_ul_research; ul_published_reviewed
ENG
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36.55%
peer-reviewed; Product line approaches are well-known in many manufacturing industries, such as consumer electronics, medical systems and automotive [1]. In recent years, approaches with a similar background have rapidly emerged within Software Engineering, so called Software Product Line (SPL) approaches [2], [3]. As automotive manufacturers and suppliers design and implement complex applications, such as driver assistance [4], they strive for mechanisms that allow them to implement such functionality on integrated platforms. This offers the opportunity to build a variety of similar systems with a minimum of technical diversity and thus allows for strategic reuse of components. This has resulted in a growing interest in SPL approaches both in the software engineering and the automotive systems domain. This paper discusses the increasing importance that SPL approaches could play within the context of Automotive Systems Engineering. To accomplish this, we first provide an overview of the major challenges faced by Automotive Systems Engineering [5]. We then present a selection of SPL approaches, which could provide solutions for the described challenges. To complement this we make the case for empirical evaluation as a basis for well-founded decisions and selection of techniques. Finally...

An analysis of the impact of modularization and standardization of vehicles electronics architecture on the automotive industry

Gaillard, Christophe-Loïc, 1974-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 120 p.; 7077729 bytes; 7085116 bytes; application/pdf; application/pdf
ENG
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The growing use of electronics in automobiles designs and their dependency on it, has increased the level of complexity of the car-system and created new challenges. But at the same time, it has created new opportunities and the potential to reduce complexity through modularization. This represents a new architectural paradigm for OEMs and suppliers. This thesis suggests an approach to this new era of automobiles designs. It looks at the effect of modularization and the advent of electronics on the supply chain in other industries. It evaluates the risks of value migration in the automotive industry and studies the mechanisms of such migrations through several interviews, financial data research, systems functional decomposition and system dynamics analysis. Electronics, along with software and control algorithms, enable an encapsulation of functionalities by creating higher levels of abstraction. While early vehicles had an all-mechanical interface between operator and actuation, electronics has allowed the separation of the processing of signals coming from the operator, the control/functionality infusion, the transfer of information and the transfer of energy. Thus, what was once integral has now the potential to be modular.; (cont.) Such a separation increases the modularizability of the automobile's architecture and gives it an opportunity to get closer to a lower bound "essential complexity" floor. While integrality helps prevent knowledge from fleeing away...

Modularization and Outsourcing: Implications for the Future of Automotive Assembly "Management of the Extended Enterprise" Research Team

Helper, Susan; Pil, Frits; Sako, Mari; Takeishi, Akira; Warburton, Max; MacDuffie, John Paul
Fonte: MIT - Massachusetts Institute of Technology Publicador: MIT - Massachusetts Institute of Technology
Formato: 39074 bytes; application/pdf
EN_US
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Overview Twice in this century, automotive assembly has been the setting for dramatic innovations in production organization that have transformed the basis of competition in the auto industry. Henry Ford's mass production and Taiichi Ohno's lean production are both systems of interrelated practices held together by a core "logic" - powerful ideas shaping how we think about "making things". As we approach the second century of the car, there are important debates about whether, once again, auto manufacturing will strike off in a new direction -- commonly described as "modular assembly." Our IMVP research team aims to contribute to this debate through the research project described below. Deverticalization through the outsourcing of production from the large automakers to their suppliers has been a dominant trend during the 1990s, including the transfer of component design responsibility as well as manufacturing. A related trend is the effort to develop more modular designs, i.e. self-contained functional units with standardized interfaces that can serve as building blocks for a variety of different products. These trends have been visible in other industries for some time, but they are relatively recent in the auto industry; as a result...

Automotive electronics business

Hase, Yoshiko, M.B.A. Massachusetts Institute of Technology
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 96 leaves
ENG
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In the automotive industry, due to the trend to introduce active safety systems, concerns about protecting the environment, and advances in information technology, key automotive manufacturers are eager to acquire new enabling technologies which can provide solutions for these issues. As a result, the demand for automotive electronics is increasing. Meanwhile, due to strict requirements for demanding specifications, as well as low volume commitment offered by car manufacturers as compared with consumer electronics products, many electronics manufacturers have so far avoided entering this business. However, as the requirement for high technology grow, the technology of the electronics companies becomes indispensable for the car manufacturers. Currently, there are some electronics companies who provide automotive parts, mostly on the components level and not on the solution level, but only few of them are truly successful. The automotive electronics business requires various types of components as well as demanding specifications for safety and operating conditions. Offering solutions for this demanding industry often requires cross-organizational initiative.; (cont.) Despite the difficult challenges, many electronics companies, including semiconductor and fabless companies...

Analysis of automotive telematics industry in Japan

Shimizu, Norihito, 1971-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 66 leaves; 2895354 bytes; 2900550 bytes; application/pdf; application/pdf
ENG
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A major element of mobile multimedia, telematics is the convergence of telecommunication and information technology which provides various services to and from the vehicle or mobile communication devices. Telematics is also a new technology which accelerates the rate of technological evolution in the automotive electronics industry. Similar to the United States and Europe, Japan is one of the nations which have advanced automotive technologies. Japanese telematics, however, doesn't have a long history. On the other hand, Japan has unique business circumstances such as highly developed mobile communication technology and contents business. The purpose of this study is to unlock the industrial structure and dynamics of the telematics industry in Japan. In addition, providing indications for building business strategies for telematics players such as automakers, auto suppliers and other industries is another objective. According to the "clockspeed" analysis, telematics clockspeed is much faster than that of automobiles. This situation creates a boundary called clockspeed collision between these two industries. Clockspeed collision will increase market pressure on automakers to provide updated electronic features and to reduce exposure of obsolescence. Clockspeed collision will also significantly affect the business strategies that each player involved in the telematics industry must consider. Value chain analysis illustrates that the telematics industry has a horizontally disintegrated structure. Also the fact that automakers have advantages in the industry is presented. In such situation...

Design Considerations for an Automotive Sensor Interface Sigma-Delta Modulator

Medeiro, Fernando; Rosa, José M. de la; Río, Rocío del; Pérez-Verdú, Belén; Rodríguez-Vázquez, Ángel
Fonte: Institute of Electrical and Electronics Engineers Publicador: Institute of Electrical and Electronics Engineers
Tipo: Artículo Formato: 303563 bytes; application/pdf
ENG
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EU IST Project 2001-34283/TAMES-2 Spanish MCyT Project TIC2001-0929/ADAVERE.; The Sigma-Delta Modulator presented in this paper contains a programmable-gain input inferface to accommodate the output signal level of a variety of automotive sensors. We show that this characteristic can be efficiently implemented by proper architecture selection and ad hoc sampling and integration capacitor structures.; Peer reviewed

A CMOS 110-dB@40-kS/s programmable-gain chopper-stabilized third-order 2-1 cascade sigma-selta modulator for low-power high-linearity automotive aensor ASICs

Rosa, José M. de la; Escalera, Sara; Pérez-Verdú, Belén; Medeiro, Fernando; Guerra, Oscar; Río, Rocío del; Rodríguez-Vázquez, Ángel
Fonte: Institute of Electrical and Electronics Engineers Publicador: Institute of Electrical and Electronics Engineers
Tipo: Artículo Formato: 2211336 bytes; application/pdf
ENG
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This paper describes a 0.35-μm CMOS chopper-stabilized switched-capacitor 2-1 cascade ΣΔ modulator for automotive sensor interfaces. The modulator architecture has been selected from an exhaustive comparison among multiple topologies in terms of resolution, speed and power dissipation. To obtain a better fitting with the characteristics of different sensor outputs, the circuit can be digitally programmed to yield four gain values (x0.5, x1, x2 and x4) and has been designed to operate within the stringent environmental conditions of automotive electronics. In order to relax the amplifier’s dynamic requirements for the different modulator gains, switchable capacitor arrays are used for all the capacitors in the first integrator. The design of the building blocks is based on a top-down CAD methodology which combines simulation and statistical optimization at different levels of the modulator hierarchy. The circuit is clocked at 5.12MHz and the overall power consumption is 14.7mW from a single 3.3-V supply. Experimental results show an overall dynamic range of 110dB within a 20-kHz signal bandwidth and 113.8dB for signals. These performance features place the reported circuit at the cutting edge of state-of-the-art high-resolution ΣΔ modulators.; This work has been supported by the EU ESPRIT IST Project 2001-34283/TAMES-2.

3D Vision Sensing for Improved Pedestrian Safety

Grubb, Grant; Zelinsky, Alex; Nilsson, Lars; Rilbe, Magnus
Fonte: Institute of Electrical and Electronics Engineers (IEEE Inc) Publicador: Institute of Electrical and Electronics Engineers (IEEE Inc)
Tipo: Conference paper
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Pedestrian-vehicle accidents account for the second largest source of automotive related fatality and injury worldwide. This paper presents a system which detects and tracks pedestrians in realtime for use with automotive Pedestrian Protection Systems (PPS) aimed at reducing such pedestrian-vehicle related injury. The system is based on a passive stereo vision configuration which segments a scene into 3D objects, classifies each object as pedestrian/non-pedestrian and finally tracks the pedestrian in 3D. Our system was implemented and tested on a Volvo test vehicle. Strong results for the system were obtained over a range of simple and complex environments, with average positive and false positive detection rates of 83.5% and 0.4% respectively.

Digital communication interface for an automotive application

Sonnaillon,M. O.; Bisheimer,G.; De Angelo,C. H.; Leidhold,R.; García,G. O.; Balda,J. C.; Barlow,F. D.
Fonte: Latin American applied research Publicador: Latin American applied research
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2005 EN
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This paper presents the design and implementation of a digital communication interface between a Motor Drive Controller (MDC) and a digital network supervisor. This work is part of the DOE/CARAT project "Integrated Controllers for Automotive Auxiliary Electric Motors", being performed between the University of Arkansas and at GEA (Applied Electronics Group), National University of Rio Cuarto. The Controller Area Network (CAN) is the digital communication protocol of choice for automotive applications. The MDC was implemented using a Digital Signal Processor (DSP) and the network supervisor using a standard personal computer (PC) with a CAN communication board.