轻型汽油车国六后处理OBD系统研发现状

Review of China 6 Aftertreatment OBD System R&D for Light Duty Gasoline Vehicles

随着轻型汽油车排放法规的不断加严,车载在线诊断(OBD)面临更复杂和更全面的技术要求。本文介绍了OBD系统的工作原理和发展历程,对轻型车国六法规中的OBD技术要求进行了总结;结合国内外典型研究成果与工程范例,重点介绍轻型汽油车集成后处理系统关键部件三效催化转化器(TWC)和汽油机颗粒捕集器(GPF)等核心诊断技术,并对基于氧传感器信号分析、储氧量模型、压差传感器、颗粒物(PM)传感器及射频(RF)传感器的故障诊断算法的原理和优缺点进行了深入解析。对OBD系统的研究现状进行了宏观和微观两个层面的归纳,从软硬件角度指出了现阶段的工作难点,并对未来OBD研发趋势进行了展望。

With the increasing tightening of emission regulations for light duty gasoline vehicles, On- Board Diagnostics (OBD) faces more complex and comprehensive technical requirements. This paper introduces the working principle and development process of the OBD system, and summarizes the OBD technical requirements in China 6 emission regulations. Combining the typical research results and engineering examples in the world, the key diagnostic technology of the important component of integrated aftertreatment system, Three- Way Catalytic Converter (TWC) and Gasoline Particulate Filter (GPF) are highlighted. The principle, advantages and disadvantages of fault diagnosis algorithms based on oxygen sensor signal analysis, oxygen storage model, differential pressure sensor, Particulate Matter(PM)sensor, Radio Frequency(RF)sensor are analyzed deeply. The research status of OBD system is summarized at the macro and micro levels. The difficulties of the current stage are pointed out from the perspective of hardware and software, and the future development trend of OBD is prospected.