共查询到16条相似文献,搜索用时 468 毫秒
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介绍了OBD系统的发展历程,阐述了OBD系统的工作原理、结构以及数据流特点。基于目前的应用状况,预测OBD系统未来的主要发展趋势。 相似文献
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针对电控柴油机诊断和维修较难的问题,采用车载自动诊断(OBD)系统对电控柴油机进行了管理。根据我国最新排放法规,分析了催化转化器效率、氧传感器故障、燃油喷射系统故障以及其他与排放相关部件的监测等电控柴油机OBD系统主要的监测需求;其次,通过对柴油共轨ECU对电路连接故障的监测、子系统可信度监测、故障灯的管理、故障确认的一般流程,及存储管理、OBD系统认证时可模拟的故障等实现过程进行了综合性描述,全面给出了柴油机OBD系统管理过程;最后,在柴油机高压油泵电磁阀上完成了实际的故障诊断试验。研究结果表明,在电控柴油机出现故障时,ECU能够通过OBD系统及时完成检测并对柴油机采取保护措施。 相似文献
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本文首先回顾重型柴油机国内外OBD标准发展历程,根据中国重型柴油机国Ⅳ、国Ⅴ、国ⅥOBD的法规要求对标准内容、循环方式、型式检验进行对比研究。详细分析主机厂在不同阶段OBD开发的主流技术路线,目的是全面梳理中国重型柴油机OBD标准发展趋势,下一阶段OBD法规趋势为弱化发动机型式认证的要求,OBD直接监测车辆排放状况,实现主管部门达标监管的最终目的。增加整车OBD的型式认证内容,重点关注NOx控制系统功能验证,OBD相关部件的故障验证以及OBD相关功能验证,本文可以指导企业下一步OBD重点开发方向。 相似文献
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本文介绍车载诊断系统(OBD)的经历过程,对我国现阶段轻型汽车(汽油机)车载诊断系统(OBD)技术的应用及局限性进行了分析,解读了国家标准、技术规范,探讨了车载诊断系统(OBD)与维护制度(I/M制度)的结合及今后的发展方向。 相似文献
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汽车电脑诊断的现状和未来 总被引:2,自引:0,他引:2
汽车电脑诊断的首要目的是快速准确地发现汽车控制部件的故障,其次是控制汽车排气,安全驾驶以及汽车生产线组装的质量检查,随着全球性的环保要求日益高涨,汽车废报的转换除污处理更依赖电脑。同时,汽车安全舒适性的提高,也要由汽车电脑的动态回馈,实时地显示在汽车仪表盘上,就目前的汽车电脑诊断技术作一初步的系统介绍,并将其发展也作一个展望。 相似文献
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We developed a dual-probe (DP) atomic force microscopy (AFM) system that has two independently controlled probes. The deflection of each cantilever is measured by the optical beam deflection (OBD) method. In order to keep a large space over the two probes for an objective lens with a large numerical aperture, we employed the OBD sensors with obliquely incident laser beams. In this paper, we describe the details of our developed DP-AFM system, including analysis of the sensitivity of the OBD sensor for detection of the cantilever deflection. We also describe a method to eliminate the crosstalk caused by the vertical translation of the cantilever. In addition, we demonstrate simultaneous topographic imaging of a test sample by the two probes and surface potential measurement on an α-sexithiophene (α-6T) thin film by one probe while electrical charges were injected by the other probe. 相似文献
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基于光点偏转方法的原子力显微镜的研制 总被引:3,自引:0,他引:3
讨论了光点偏转方法检测微小位移的原理,建立了相应的光电检测系统,用于检测微悬臂(针尖)的微位移,并在此基础上研制了纳米级分辨率的原子力显微镜。仪器最大扫描范围可达2×2μm2。文中给出了部分样品的测试结果。 相似文献
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Anders Klingenberg 《Journal of microscopy》1980,119(2):257-265
This paper gives a brief historical view of the origin, development, and application of the comparison macroscope, within the field of criminal technique. The background for developing a new comparison macroscope as well as the requirements for it are explained, and a decription is given of how the requirements were fulfilled. Finally the technical data for the new comparison macroscope and some applications are given. 相似文献
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《Measurement》2016
The main purpose of this work is to develop a low-cost data acquisition platform prototype for automotive telemetry applications such as driving style analysis, fleet management and fault detection. Measurement data, gathered from On-Board Diagnostics (OBD) sensors and an Inertial Measurement Unit (IMU), are logged on the onboard device for remote backup.An accurate analysis of the collected data has been performed to identify the main parameters able to monitor driver behavior and to define suitable indexes to evaluate the driving performance.Particular attention has been paid to the analysis of vehicle parameters during braking and gear shifting in order to classify different attitudes and generate driver profiles and trends.Understanding drivers’ characteristic behavior can contribute significantly to road safety, to define insurance premium, to engage user in saving fuel and money and to correlate faults of the car with the driving style. 相似文献