汽车CAN总线概述及其故障诊断检测方法

CAN总线广泛应用于汽车上,主要用来实现车载网络各电控单元之间的信息交换,形成车载网络系统。由于CAN总线的技术特点,在当前的汽车总线网络市场上CAN总线占据主导地位。因此,介绍CAN总线的基本工作原理和典型的CAN总线应用实例。然后介绍常用的CAN总线故障诊断设备和常见的汽车CAN总线故障检测思路,并通过案例说明汽车CAN总线故障诊断方法。     

基于CAN总线的控制系统的应用研究

随着世界科技和网络的快速发展，国外在应用到CAN总线的控制系统方面已经非常成熟，而国内在这方面的应用上却存在着很大的空缺。CAN总线的控制系统有着非常多的一些优势。比如具有很强的可靠性，数据处理错误低，运行成本比较低，与其他的系统对比来看存在着绝对的优势。因此这方面主题的研究是非常重要的和欠缺的。本文主要是从CAN的定义人手，同时还对CAN总线历史研究进行了一个简单的综述，另外还对CAN总线的发展现状以及和其特征描述进行了初步阐述，主要探讨了CAN总线的控制系统的应用领域与范围，并对CAN总线的控制系统的未来发展的方向研究提出建设性的意建议。     

基于CAN总线的车速测量系统的设计与研究

提出了利用MRE转速传感器并结合软件解算的车速测量系统,该系统利用SJA1000 CAN控制器及CTM1050T CAN收发器有效实现了车速信息经CAN总线向中央控制ECU的传输。仿真分析实验(或车架实验)证明,车速测量系统能够准确完成高、低速车速的测量。     

CAN总线时间触发机制的实现

分析了CAN总线的时间触发机制，基于8052单片机和CAN控制器SJA1000设计了时间触发机制的实现方案，给出了网络中基本周期中可传输的最大消息数目及可调度分析方法。以汽车引擎控制系统为例进行的实验结果表明，利用CAN总线时间触发机制不仅可以有效地管理消息的传输，而且提高了总线带宽利用率。     

基于AVR处理器CAN总线模块在电梯控制的应用

简要介绍了CAN总线，分析了CAN控制器在atgocan128中的基本原理特点，并给出了CAN总线的初始化关键代码，分析并指出C语言的发送消息功能代码描述。最后给出了CPU外围收发器TjA105啪硬件连接原理图     

海军航空四站装备远程保障系统终端设计

介绍了基于GPS、GPRS技术的四站装备远程管理终端设备设计方案。采用UC/OS实时操作系统协调各个任务的并行处理;描述了利用LPC系列单片机接收GPS输出定位信息的解析方法;运用CAN总线获取车辆运行参数和故障信息,并给出了具有抗干扰功能的CAN总线设计电路图;阐述了利用中国移动GPRS公用无线网络,与internet上的服务器进行通讯的实现方法。实践证明,在某型电源车上该方案能有效的利用internet远程获取电源车的车辆定位信息、运行参数和故障信息,并且采用了多种抗干扰设计,具有更高的可靠性。     

CAN总线的消息机制

现场总线是近20年发展起来的新技术，CAN总线是一种应用广泛的现场总线，在工业测控和工业自动化等领域有很大的应用前景。本文中介绍了CAN总线的数据传输特点、消息机制以及消息包的格式，并对can总线中的帧类型、数据帧、远程帧、出错帧、超载帧及帧空间的概念和结构进行了详细论述，最后综合CAN总线的技术和特点，预测了can总线的发展趋势。     

测控网络中CAN总线及其实现

本文主要介绍了CAN总线的特点、应用范围、通讯协议以及CAN总线系统的一种实现方法。最后,介绍厂在测控网络中CAN总线系统的典型结构。     

CAN总线的分布式铝电解控制系统浅论

介绍了基于CAN总线的发展及CAN总线在分布式铝电解控制系统的设计和实现。     

CAN总线的机器人传感器网络设计

研发了基于CAN总线的移动机器人传感器网络,有效地保证了移动机器人多传感器信息通讯的实时性和稳定性.详细阐述了该移动机器人的体系结构和传感器网络的组成,同时设计了一套CAN网络通讯协议,实现了传感器节点的多主通讯,在很大程度上改进和提高了移动机器人的性能.     

Estimation of Parameters of Universal Distribution of Moments of Failure of Products

A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling.     

Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons

A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue.     

Analysis of the rate of propagation of the wave of change of boiling modes

An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate agreement is demonstrated between the derived relations and experimental data.     

Estimation of potentialities of methods of summation of direct measurement errors

Conventional methods for summation of direct measurement errors are considered. Conditions under which these methods provide consistent results are stated. It is proposed to utilize for characteristic of the total error, its interval estimator or the half-sum of the value obtained by adding up its arithmetic and geometric random errors.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 10–12, April, 1995.     

空压机轴承箱蜗壳温度探头油封改造

由于空压机进气侧轴承箱蜗壳温度探头密封效果不好,使空压机及其后续管道受到油污染。后将温度探头的O形圈密封改为骨架油封,杜绝了轴承箱漏油问题。文章简介空压机的结构和技术参数,详细介绍了骨架油封的制作和优点。     

Characteristics of mechanical properties of materials in studies of conditions of attainment of marginal states

It is shown that conditions of attainment of marginal states in the material of structural components are formulated on the basis of analysis of force and deformation criteria of formation and development of destruction. The parameters of these criteria are data on types of structural materials, standard and special characteristics of their mechanical properties, structural forms of considered elements of the equipment, and their operating stress loading. In this case, the construction of a system of state equations for describing interrelation of current damage, external actions, and responses to them is based on the concept of calculating variations in properties of materials at all stages of the design life cycle.     

Determination of parameters of microstructural inhomogeneity of deformation of metals by the method of modeling

The article suggests a method of evaluating the microstructural inhomogeneity of deformation of metals by modeling. The method includes the measurement of deformations of metal according to meshes of a dividing grid with small base and the calculation of the distribution parameters of microdeformations in model representation. It is shown that the modeling method makes it possible objectively to evaluate the microinhomogeneity of deformation of metals independently of the chosen mesh size of the dividing grid. New structural characteristics are introduced: the base and wave of variation expressing the degree of crumbling or amalgamation of metal grains by inhomogeneity of deformation.Translated from Problemy Prochnosti, No. 7, pp. 40–44, July, 1991.     

水三相点复现的不确定度评定

水三相点是开尔文热力学温度的唯一基准点，也是ITS-90国际温标重要的定义固定点。因此，水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来，中国计量科学研究院研制出一系列高质量的水三相点容器，加强了水三相点的研究，为不确定度的分析提供了更为可靠的实验依据。同时，不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此，根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明，其扩展不确定度为0．16mK(k=2．69，P=0．99)。