SAE J1939协议在客车上的应用现状及展望

简单介绍了控制器局域网络CAN(Controller Area Network)和SAE J1939协议的产生发展状况,并对SAE J1939的结构特点进行了分析.通过与其他协议,如SAEJ1708、SAE J1587进行比较,分析了SAE J1939协议在客车上应用的可行性.介绍了SAE J1939应用的国内外现状和在客车网络应用中目前存在的问题,并提出了建议.最后对J1939的意义做了阐述并展望了SAE J1939在客车CAN总线上的应用的发展前景.     

基于SAE J1939协议的CAN总线车灯故障诊断系统的实现

车灯故障诊断系统是车辆诊断系统的一部分.它能及时发现车灯故障,保障行车安全,并为车辆维修提供便利.介绍了一种基于SAE J1939协议的CAN总线车灯诊断系统的设计实现,探讨了诊断系统拓扑结构、诊断流程、硬件原理及实现、通讯协议参数的设定.     

基于CAN的汽车车灯控制系统设计

采用CAN（Controller Area Network）构建了汽车车灯控制系统,并基于SAE J1939协议设计了车灯控制报文格式。在硬件设计中,本文基于USBCAN-II接口卡实现开关控制功能,以P87C591为核心实现车灯控制功能。为达到代码的可重用性,本文采用模块化程序设计思想设计了基于CAN的汽车车灯控制系统软件。     

基于SAE J1939协议的发动机通信控制器仿真与设计

SAE J1939协议是一种支持闭环控制的在多个ECU之间高速通信的网络协议[1]。主要运用于载货车和客车上。它以CAN2.0为网络核心并构建了符合OSI参考模型的多层协议,分别实现数据传输、网络构建、网络管理、故障诊断等功能。以SAE J1939协议为基础,对发电机组中电控柴油机数据实时采集与分析,判断发动机实际运行状态;建立一种可行的通信网络模型并对其仿真,验证其可靠性。针对沃尔沃TAD532GE型柴油机EDC4电控系统设计了通信控制节点,实现对发动机运行状况的实时监测。     

基于SAE J1939协议的客车CAN总线发动机测试系统

介绍了控制器局域网络CAN（Controller Area Network）和SAE J1939协议的产生发展状况,并对SAE J1939协议所包含的各个文件的进行了分析,并通过结合使用英国Warwick公司的X—analyser软件和瑞典Kvaser的CAN总线分析仪对客车的发动机进行测试和诊断,最后对本测试进行了总结。     

基于J1939协议解析与数据库创建

通过分析客车网络技术,根据SAE J1939应用层协议,建立了PGN(Parameter Group Number)与SPN(Suspect Parameter Number)数据库。分析报文ID地址与数据信息、PGN调用对应的解析程序,进行报文解析,实时显示车辆运行过程中的主要状态参数,开发一种客车状态信息采集与处理系统。     

重型汽车CAN总线网络方案研究

实现汽车内部网络化控制是一种迫切的需要,CAN以优异的性能成为汽车局域网的发展趋势.根据国内外重型汽车的发展提出了几种基于SAE J1939协议的重型汽车CAN总线控制系统的网络方案,并通过通信实验验证网络方案的科学性.     

Android系统下SAE J1939协议的移植

针对Android系统下的控制器局域网(CAN)总线缺少应用层驱动的现状,提出了一种将Linux系统中的CAN总线应用层驱动移植到Android系统中的方法。选择SAE J1939协议作为Android系统下CAN总线应用层协议并移植由Kurt Van Dijck和Pieter Beyens维护的linux-can-j1939项目。首先分析项目结构,将对应文件合并到Android内核代码中;然后修改头文件、协议实现代码并增加内核缺失的结构体、函数等;最后修改Makefile和Kbuild文件并编译生成内核。实验结果表明:编译后的Android内核实现了SAE J1939协议所规定的地址声明、数据拆包重组、网络管理等功能。应用层驱动移植后,通过调用Android应用层接口就可开发丰富的基于CAN总线的Android应用程序。     

基于J1939的车辆下线检测系统的数据库设计

SAE J1939协议是重型车辆广泛采用的一种车载网络规范,它详细定义了大量的参数,通过对车上协议数据报文的分析就可以获取车辆重要电控单元的各项状态信息.针对整车厂车辆下线检测的需求,在J1939协议应用层的功能基础上,经过需求分析并使用PowerDesigner建模工具对J1939的参数数据库进行建模,建立具体数据库管理系统的物理数据库,并在此基础上利用CodeSmith代码生成工具以及.Nettiers模板来生成该数据库应用系统中数据访问层的.NET代码框架,实现车辆下线检测系统中对J1939协议参数的支持,最终完成设计.     

基于SAE J1939协议的车辆网络集成方法

电控单元（ECU）是车辆内部系统控制模块的代名词。本文介绍如何集成自定义ECU和具有SAE J1939CAN接口的ECU产品,实现基于SAE J1939协议的车辆网络,完成自定义ECU的信息采集和各ECU间的信息交换。该网络使用双核单片机和μC/OS-Ⅱ操作系统,通过液晶显示器和按键实现信息交互,解决了车辆仪表盘信息量较少和故障诊断实时性不足等问题。该方法可推广应用到其他工业环境类似的CAN通信领域,如列车控制、工厂控制等。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.