汽油机OBD失火标定技术的研究(中国Ⅲ、Ⅳ阶段)

Study on Misfire Calibration Technology for Gasoline Engine OBD(China Ⅲ and Ⅳ Phase)

根据GB18352.3-2005《轻型汽车污染物排放限值及测量方法》中OBD及其功能要求,介绍了失火诊断和标定流程。阐述了实际失火监测区的标定方法,包括发动机转速n3的标定和失火监测区进气管压力的标定。论述了失火判定阈值的标定方法和失火亮灯报警阈值的标定方法。

According to OBD and its function requirement in the National Emission Regulations GB18352.3-2005, the misfire diagnosis and calibration flow are introduced.The calibration methods of actual misfire detection area are discussed,including the calibration of engine revolution speed n3 and air intake tube pressure of misfire detection area.The calibration methods of misfire judging threshold value and misfire alarm threshold value are also discussed.