CAN总线技术在自动变速器加载试验中的应用研究

介绍了自动变速器加载试验中CAN总线接口技术的实现.在研究电控自动变速器加载试验台的基础上,设计了以Motorola 32位微处理器MC68376为核心的CAN总线硬件接口电路,采用标准CAN总线的通讯协议,编写了CAN总线接收/发送软件,并在试验台上实现了CAN结点之间的数据通讯.通过CAN采集数据对自动变速器换挡等过程进行了分析,经调速实现了发动机与自动变速器的一体化控制,从而提高了换挡品质.     

浅析汽车多路传输系统的应用与开发（一）

本文着重论述FIAT Palio,Siena,Palio Weekend汽车车身计算机（Body Computer)与该车各电子电器控制系统（Node结点）之间进行多路，串行，同步传输信息－多路传输系统的设计基本原理及其应用，尤其是根据用于汽车领域方向的CAN总线协议（以下简称CAN总线）指导FIAT1782系列汽车如何实现多路传输系统－“威尼斯”系统的核心思想，通过“威尼斯”系统的功能和特点，进一步论述车身计算机在FIAT 1782系列汽车电子电器控制系统中所起的核心作用－主宰通信数据进行多路传输，并就“威尼斯”系统的其它功能（部分电器功能集成化控制，信号测试与故障诊断，在线编程，各种车型的配置与生产管理和销售反馈信息有机地结合等）进一步论述采用CAN技术的必要性和重要性以及多路传输系统的抗干扰性，可靠性，灵活性和实时性，至于车身计算机硬件设计和软件编程的具体内容不在论述范围之内。     

某重卡CAN总线控制系统的设计

CAN是一种有效支持分布式控制或实时控制的串行通信网络。本文以某重型卡车为例,遵守J1939协议,通过CAN网络拓扑架构的搭建,展示了车身控制系统的的工作过程和故障诊断过程,论述了CAN总线在商用车重卡领域的应用和CAN在电控系统中应用的经济性、方便性及准确性。通过CAN总线控制系统与传统线束控制对比,体现了CAN总线系统的强大优势。     

时间触发CAN--TTCAN

随着车上网络技术的深入应用,ISO11898-1定义的标准CAN逐渐显示了在实时性方面的不足。Bosch公司开发了建立在标准CAN基础上的支持时间触发的CAN高层协议——时间触发CAN。本文详细分析时间触发CAN——TTCAN的同步调度工作机制,并比较了CAN和其他时间触发方式的车上网络协议Byteflight和TTP/C各自的优缺点。     

基于一种干扰机制的车载CAN网络 BUSOFF测试方案

整车CAN总线测试工作是整个平台架构的重要部分。本文基于美国Vector公司的CANOE和CANSTRESS测试工具实现了一种对整车CAN网络BUSOFF进行系统级的测试方案。首先测试每一节点的BUSOFF恢复机制是否符合预定义的规范。其次使用最高优先级报文或网络管理报文的干扰机制来测试在CAN网络BUSOFF时各个节点的互不干扰性。本文重点阐述了此干扰机制的原理,从理论上说明此干扰机制的正确性,通过编写测试用例验证了此干扰机制以及整体测试方案的准确性、高效性与有效性,并且完善了整车CAN网络的测试方案与测试规范。     

CAN总线用于汽车布线的技术现状分析

介绍了用于汽车布线的几种通信标准,论述了CAN总线技术的产生、特点、原理和现状,并提出国内加强CAN总线技术研究的几点建议。INTOPICtuationanalyoautomobilep     

电动微型汽车的CAN总线仪表板设计

基于CAN总线技术设计完成了电动微型汽车仪表板,并针对CAN总线技术的优势进行了论述,同时简要介绍了仪表板采用的抗干扰措施。     

基于CAN总线的汽车车身控制系统的研究与应用

文中论述了基于CAN(Controller Area Network)总线的汽车车身控制系统的设计与实现。具体阐述该系统软、硬件的设计方案和设计重点,并讲解了CAN总线控制器SJA 1000的应用。     

电动汽车CAN报文的解析及应用

为了更准确地确定电动汽车有关充电部分的故障范围,熟练掌握电动汽车CAN报文非常重要。本文论述CAN报文定义、接收CAN报文的方法以及CAN报文的组成与帧结构;通过实例解析电动汽车整车控制与电池管理系统之间CAN通信报文的含义,并分析如何应用CAN报文的解析来诊断有关电动汽车的故障。     

基于CAN总线的客车电气系统设计与ASR故障诊断

介绍＂动力CAN网＋网桥＋车身CAN网＂结构在中型客车上的设计应用,论述通过CAN报文分析查找ASR功能失效的原因。     

TTCAN系统及其在分布式车辆网络中的应用

在车辆总线技术研究的基础上分析了CAN通信应用,对CAN总线仲裁消息发送延迟、不相容行为消息错误进行了详细研究,并通过试验定量分析事件触发CAN在实时系统应用中的不足。为克服传统CAN通信不足引入时间触发通信协议,阐述了时间触发CAN（TTCAN）系统结构、定时机制、容错等关键技术,并对车辆其它类似总线进行了分析,最后对TTCAN在分布式车辆网络中的应用前景进行了展望。     

基于TTCAN的燃料电池系统分布式控制系统设计

以32位单片机MC68376及8位单片机C8051F040为核心芯片设计了基于TTCAN的燃料电池系统分布式控制系统。该设计在硬件上高度切合燃料电池系统的特点;在软件上以嵌入式实时操作系统为平台;在通信网络上采用TTCAN的概念对传统CAN网络进行有序化;在控制策略上采用负载跟随的算法。台架试验表明,该分布式控制系统具有较好的软硬件稳定性和可靠性。     

CAN总线系统在电动轿车上的应用

对控制器局域网络CAN总线技术应用于电动轿车的特点和通信协议作了分析；在三总线设计思想指导下，对于CAN总线技术在电动轿车中的具体实现作了研究。相关的试验结果表明，该系统达到了较高的性能指标。     

Node-based scheduling method for easy migration from CAN to FlexRay in in-vehicle networking systems

As vehicles become more intelligent, in-vehicle networking (IVN) systems such as controller area network (CAN) are essential for the convenience and safety of drivers. To expand the applicability of IVN systems, attention is currently being focused on chassis networking systems that require increased network capacity and real-time capabilities. FlexRay was developed to replace CAN protocol in chassis networking systems, to remedy the shortage of transmission capacity and unsatisfactory real-time transmission delay of conventional CAN. However, FlexRay network systems require a complex scheduling method, which is a barrier to their implementation as chassis networking systems. In particular, if we want to migrate from a CAN network to a FlexRay network using the well-defined CAN message database, which has been specifically constructed for chassis networking systems by automotive vendors, a new type of scheduling method is necessary to reduce scheduling efforts during the software development process. This paper presents a node-based scheduling method for easy migration from a CAN network to a FlexRay network system. To demonstrate the feasibility of the technique, its performance is evaluated in terms of various software complexity indices.     

Traffic-balancing algorithm for can systems with dual communication channels to enhance the network capacity

The controller area network (CAN) is the dominant protocol for in-vehicle network (IVN) systems because it provides bounded transmission delay among electronic control units (ECUs) at data rates between 100 Kbps and 1 Mbps. Many automotive companies have chosen the CAN protocol for their chassis network system of intelligent vehicles. However, the increasing number of ECUs in intelligent vehicles and the need for more intelligent functions require a network system with more network capacity and real-time capability. As one approach to enhance the network capacity of a CAN system, this paper introduces a CAN system with dual communication channels. This paper also presents a traffic-balancing algorithm that predicts the traffic of each channel and allocates frames to the most appropriate channel. An experimental testbed using commercial off-the-shelf microcontrollers with two CAN controllers was used to demonstrate the feasibility of the traffic-balancing algorithm.     

Expanding transmission capacity of can systems using dual communication channels with kalman prediction

The controller area network (CAN) protocol is widely used for in-vehicle network (IVN) systems, and many automotive companies also use the CAN in chassis network systems. However, the increasing number of electronic control units (ECUs) dictated by the need for more intelligent and fuel-efficient functions requires an IVN system with a greater transmission capacity and less network delay. Automotive companies have tried several approaches such as segmenting CAN systems and developing time-triggered protocols. This paper presents a practical method for increasing the transmission capacity and reducing the network delay in CAN systems using dual communication channels with a traffic-balancing algorithm based on Kalman prediction to forecast the traffic on each channel and allocate frames to the one that is most appropriate. An experimental testbed using commercial microcontrollers with two or more CAN protocol controllers was used to demonstrate the feasibility of the Kalman traffic-balancing algorithm. Experimental results show that the traffic-balancing CAN system with Kalman prediction reduced the transmission delay of all priority messages compared to that of a simple method, such as a channel-switching CAN, without sacrificing the performance for high-priority messages.     

高低速CAN总线在汽车控制系统中的研究与应用

采用TI公司的TMS320LF2402A作为微控制器兼作网关,构造高低速CAN通信网络,对汽车控制系统进行控制,讲述了CAN总线在汽车计算机控制系统中的应用情况,指出高低速CAN总线网络作为一种极具潜力的控制器局域网,在汽车计算机控制系统中有着广阔的应用前景。对CAN总线和DSP进行了简要介绍。     

Design and implementation of a UPnP-can gateway for automotive environments

In this paper, we propose a universal plug and play (UPnP) — controller area network (CAN) gateway system using UPnP middleware for interoperability between external smart devices and an in-vehicle network. The proposed gateway consists of a UPnP communication device, a CAN communication device, and a device translator layer. In-vehicle devices are not usually IP-based, so we implemented an in-vehicle device manager in the UPnP communication device which is in the gateway. We developed a vehicle simulator to produce real vehicular data for performance analysis. The CAN communication device transmits and receives real-time vehicle data between the real vehicular simulator and external devices through the UPnP. The device translator layer configures a message frame for enabling seamless data input and output between the CAN and UPnP protocols. After implementation, we generated an internal-external service request and tested the result. Finally, we confirmed the service request and operation between external devices and the internal vehicular device. Additionally, for a variety of external device numbers and communication environments, we demonstrated the gateway performance by measuring the round trip time (RTT) for overall service implementation.     

智能网联趋势下车辆网关路由缓存研究与应用

伴随汽车智能网联发展,车辆电气网络架构行业趋势由1~2路CAN总线网络快速演变为7~8路CAN总线与4~5路百兆以太网相结合的融合网络架构。其中网关作为车辆网络的数据交互中心,提供了各网络之间的无缝通信,并需要以极低的延迟将这些数据进行可靠传输,这对低成本网关是一个巨大的挑战。提出了一种基于车载融合网络下低成本网关路由软件缓存区的设计方法,以路由软件缓存区去配合CAN控制器和以太网Switch硬件缓存区,设计中断式报文存储发送进程,将收到的数据实时发送到硬件发送缓存区,当硬件发送缓存区已满,则将报文存储到软件缓存区中。通过与软硬件缓存区的这种联动方式,能够实时的接收报文,保证报文不丢帧;也能够在目标总线负载率较大时,避免漏发报文以及保证发送报文周期。     

汽车底盘控制系统总线的应用现状研究

简述了汽车底盘控制系统总线的种类及技术特点,给出先进的汽车车载网络拓扑结构。详细论述了在汽车控制领域得到广泛应用的控制器局域网和最具发展潜力的线控技术及其通讯特点,特别针对CAN总线介绍了SAE J1939、CANopen、DeviceNet 3种基于CAN的主流应用层协议。最后就我国车载网络的发展进行了探讨。