OBD Technology and Control Strategy for Diesel Vehicles 柴油车OBD技术及其控制策略 RBCD/EAP1- Xu Xiaosong | 23/11/2006 | © Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Diesel Systems Table of Content 目录 Diesel OBD system in EU3 stage 国3阶段的柴油车OBD系统 Possible failures in diesel system and its OBD technology 柴油系统可能的故障及其相关的在线诊断技术 EGR 废气再循环 Air flow sensor 空气流量传感器 Rail pressure sensor 轨压传感器 OBD control strategy OBD相关的控制策略 In-service conformity test 在用车符合性检查 Inspection&Maintenance (I&M) test 检查/保养检测 Relevant tests overview in Europe 欧洲相关的检查制度体系 Development of diesel OBD in EU4 stage and diesel prospect 国4阶段柴油车OBD的发展，及柴油车的前景OBD Technology and Control Strategy for Diesel Vehicles 柴油车OBD技术及其控制策略 RBCD/EAP1- Xu Xiaosong | 23/11/2006 | © Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Diesel Systems Overview of diagnostic system 诊断系统概况 电器连接的诊断 传感器 空气质量流量 轨压传感器 转速传感器 ……... 执行其 喷油器 油量控制单元 EGR 阀 ……… 功能性诊断 控制器偏差 合理性检查 …….. 发动机ECU自诊 断 EEPROM 检查 Watch dog检查 ……… 诊断管理系统 (DSM) 故障确认 MIL 控制 故障内存管理 标准诊断仪接EGR 废气再循环 EGR valve is driven by vacuum air. EGR system is close loop controlled by air mass metering. EGR阀由空气负压驱动。整个EGR系统根据新鲜空气进气量闭环控制。 Possible failures in EGR valve and it’s driving system: EGR阀及其驱动系统可能的故障为： Coking at EGR valve, so that it’s blocked EGR阀结焦被卡住 Air leakage in the driving system 驱动系统管路的泄漏In-service conformity test 在用车符合性检查 Purpose目的: Ensure the function of the emission control during normal useful life of vehicles 确保排放控制系统在车辆生命周期内运行正常 Regulations in Europe 欧洲法规中的实行办法 check of ≥ 3 vehicles taken from the field 从实际在用车辆中抽取≥3辆车 vehicles aged between 6 month / 15000 km and 5 years / 80000 km 被检车辆已被使用了6个月/15000公里到5年/80000公里之间 vehicles must be properly maintained and have no indications of abuse, tampering or major repair 被检车辆必须保养良好，不存在曾被滥用，改动，和说明书规定之外的大修 before the test vehicles have to be checked for: filters, drive belts, fluids, hoses, wiring, fuel, compression, ignition 在进行测试之前，被检车辆必须进行下述检查：空滤，所有驱动皮带，所有液面，线束，燃油回路 ，发动机压缩和点火 Report of OBD memory contents 记录OBD系统中储存的故障代码 Test检测: - Emissions (type I test) 排放（一型实验） - OBD system including emission tests with faulty or deteriorated components OBD 系统包括模拟失效模式后用被检车辆进行排放实验 If test results are negative: Manufacturer must submit a plan of remedial measures to assure the conformity with the requirements for all vehicles in the field (Recall !) 如果检查结果不合格：车辆制造商必须提交一份补救措施计划，来确保所有已售出在用车的符合性The in service conformity test is not strictly performed in Europe, because the following difficulty在用车符合性检查在欧洲实际并未严格执行，是因为存在以下现 实的困难: High difficulty to get a proper car. Taxi not proper because of unusual intensively use, normal private cars are not able to get freely. 不容易得到合适的被检车辆。作为公共用途目的的车辆，如出租车往往使用强度 过高；而私家车则不能免费的随意得到。 The influence of environment conditions are too high. Different fuel quality and air quality may need to unexpected deterioration. 被检使用过程中驾驶环境的影响对检测结果将有很大的影响。不同的油品，空气 质量或者是环境温度，可能导致不同的部件老化结果。而对被检车辆的使用环境 难以确定。 Difficult to determine the status of the test car. Different driving behaviour and maintenance are not so easy to identify, but can lead to very different results. 难以确定车辆的维修保养，和使用情况。如果维修保养没有做好，甚至车主的驾 驶习惯不同，都会导致不同的老化结果，以影响到检测结果在德国柴油车的(I&M)检查流程 钥匙开关开, 故障灯亮? 发动机怠速 故障灯灭? 是 故障灯 工作正常 是 能建立通信? 检测未完成 车辆不通过 否 插入通用 OBD诊断仪 否 否 就绪状态 全部就绪? 是 模式$03 读到故障代码? 是 检测完成 车辆不通过 是 烟度测量 通过? 否 Print out of result 否 替代测试 人工检查 检测完成 车辆通过