CAN总线网络层协议栈开发测试

对ISO15765协议进行分析,依据协议在基于MC9S12DP512芯片的整车控制器上完成CAN网络层协议栈的开发,给出开发过程。在VC环境下开发测试程序,对协议栈进行测试。结果表明,实现的CAN网络层协议栈符合ISO15765协议的规定,可满足车辆故障诊断系统等具体应用中系统对CAN网络层通信的需求。     

整车控制器BootLoader的设计与实现

针对传统BDM工具下载或升级应用程序比较麻烦的问题,采用CCP在线更新应用程序,设计一种基于CAN总线的专用BootLoader。介绍BootLoader的设计及CCP在整车控制器端和PC端的实现。实车实验结果证明,BootLoader能够正确引导程序的运行,准确、方便地实现应用程序的下载和升级。     

Bluetooth wireless monitoring,diagnosis and calibration interface for control system of fuel cell bus in Olympic demonstration

With the worldwide deterioration of the natural environment and the fossil fuel crisis, the possible commercialization of fuel cell vehicles has become a hot topic. In July 2008, Beijing started a clean public transportation plan for the 29th Olympic games. Three fuel cell city buses and 497 other low-emission vehicles are now serving the Olympic core area and Beijing urban areas. The fuel cell buses will operate along a fixed bus line for 1 year as a public demonstration of green energy vehicles. Due to the specialized nature of fuel cell engines and electrified power-train systems, measurement, monitoring and calibration devices are indispensable. Based on the latest Bluetooth wireless technology, a novel Bluetooth universal data interface was developed for the control system of the fuel cell city bus. On this platform, a series of wireless portable control auxiliary systems have been implemented, including wireless calibration, a monitoring system and an in-system programming platform, all of which are ensuring normal operation of the fuel cell buses used in the demonstration.     

基于UDS协议的整车VCU固件升级方案

针对传统VCU(Vehicle Control Unit)固件升级方法繁杂、协议不规范并且升级过程中硬件拆卸易损等问题,提出一种基于UDS(Unified Diagnostic Service)协议的整车VCU固件升级方案。结合测试样车现有电子电气架构,参照ISO14229和ISO15765协议中的固件升级服务规范,实现了整车VCU固件升级功能。测试结果表明,该升级方案能够准确、稳定地实现VCU的固件程序更新,极大方便了后期开发、测试和维护工作。     

基于MC9S12XEP100的整车控制器CAN BootLoader设计与实现

为了避免因使用传统BDM工具进行下载应用程序带来的不便,基于飞思卡尔S12X系列微控制器MC9S12XEP100,设计并实现了一个应用于整车控制器上的CAN BootLoader.该BootLoader可以通过进行简单的配置修改而应用于其他的S12X系列微控制器.实验结果表明:BootLoader能正确引导程序运行,准确、方便地下载应用程序.     

高压直流输电换流阀晶闸管控制单元原理分析

高压直流输电中的换流阀和SVC中TCR或TSC阀体,都是由晶闸管级串联组成的。每个晶闸管级由直流均压电路、交流均压电路、晶闸管控制单元和晶闸管组成,其中晶闸管控制单元是核心。本文首先指出高压串联硅堆中晶闸管控制单元所必须具有的几个基本功能;然后以大量的实际应用为基础,深入剖析了晶闸管控制单元的功能和原理,最后指出了该装置在研制过程中应该注意的一些事项。     

Proton exchange membrane fuel cell system diagnosis based on the signed directed graph method

The fuel-cell powered bus is becoming the favored choice for electric vehicles because of its extended driving range, zero emissions, and high energy conversion efficiency when compared with battery-operated electric vehicles. In China, a demonstration program for the fuel cell bus fleet operated at the Beijing Olympics in 2008 and the Shanghai Expo in 2010. It is necessary to develop comprehensive proton exchange membrane fuel cell (PEMFC) diagnostic tools to increase the reliability of these systems. It is especially critical for fuel-cell city buses serving large numbers of passengers using public transportation. This paper presents a diagnostic analysis and implementation study based on the signed directed graph (SDG) method for the fuel-cell system. This diagnostic system was successfully implemented in the fuel-cell bus fleet at the Shanghai Expo in 2010.     

基于虚拟仪器的VCU自动测试系统设计

在纯电动汽车开发过程中,整车控制器的软件与硬件会频繁更新,为了快速匹配样件、提高测试效率、提升测试吞吐量,设计了通用自动化测试系统。该系统使用TestStand作为测试执行模块。在LabVIEW中开发了一套即时可用的测试动作库和驱动程序,动作库执行测试动作,通过TestStand引擎与驱动程序进行数据交互。设计了测试项目管理软件,覆盖VCU测试全过程并保证可追溯性。实际测试应用表明,该系统可以快速配置测试环境、生成可执行测试序列,能够高效地定位控制器缺陷,且运行稳定、通用性好。     

高压直流输电开路试验中换流阀设备保护的探讨

在呼伦贝尔至辽宁直流输电工程换流阀直流开路试验中,由于换流阀多次保护触发动作引起系统跳闸,导致站系统试验无法进行。笔者结合该试验过程,从直流开路试验基本原理、换流阀监控和极控制保护几个方面进行分析讨论,提出阀控单元(VCU)对换流阀的保护完全可以保证换流阀设备的安全,极控制保护对换流阀保护触发动作的监控可只作为监视,不必产生系统跳闸,从而保证OLT试验顺利进行。     

COL逻辑模块在直流输电控制系统中的应用

在高岭直流输电工程中,出现逻辑切换模块COL与VCU设备接口时信号相互依赖,造成直流系统停机现象.针对COL模块在工程应用中出现的问题,对COL模块的信号逻辑和VCU信号接口逻辑进行了分析,得出VCU发出的"VCU正常"信号对极控系统的"极控系统正常"信号的依赖,直接导致了VCU故障之后,VCU故障信号将一直存在,以致极控系统不可用,造成直流系统停机.并提出了改进方案,避免工程应用中出现盲点,造成不必要的系统停机,提高直流输电系统的安全稳定和可控性.