小型农业机械柴油机排放测试循环研究

Research on emission test cycle of small-scale agricultural machinery diesel engine

针对国内现行实施的非道路移动机械用柴油机排放标准中规定的ISO 8178 C1八工况稳态排放测试循环在保有量巨大的小型农业机械柴油机上的适用性有待商榷的问题,设计了基于单片机的柴油机工况记录仪,并采集记录小型农业机械柴油机的实际运行工况信息,通过数据分析与提炼,提出适用于国内小型农业机械柴油机的六工况稳态排放测试循环,并进行台架试验验证。数据分析结果表明,国内小型农业机械柴油机典型运行工况与全球统一的ISO 8178 C1八工况存在明显差异;台架排放测试结果表明,小型农业机械柴油机在拟定六工况下污染物的综合排放水平与ISO 8178 C1八工况下污染物的综合排放水平差异明显,且在绝大部分情况下,六工况比八工况下的排放水平更加恶劣。该结果可为后续相关排放标准的制(修)订与小型农业机械柴油机排放污染控制技术研究提供一定的参考。

The applicability of ISO 8178 C1 eight steady-state emission test cycle to small-scale agricultural machinery diesel engines with huge reserves remains to be discussed,so a diesel engine working condition recorder based on a single chip microcomputer was designed to collect and record the actual working condition information of small-scale agricultural machinery diesel engines.Through data analysis and extraction,a sixcondition steady-state emission test cycle suitable for domestic small-scale agricultural machinery diesel engine was proposed and verified by bench test.The results of data analysis showed that the typical working conditions of domestic small-scale agricultural machinery diesel engine were quite different from those of the ISO 8178 C1 eight operating cycle.The results of bench emission test showed that the comprehensive emission level of pollutants of small-scale agricultural machinery diesel engine under the six working conditions was obviously different from that under the ISO 8178 C1 eight working conditions,and in most cases,the emission level under the six working conditions was worse than that under the eight working conditions.The above results can provide some references for the formulation and revision of relevant emission standards and the research on emission control technology of small-scale agricultural machinery diesel engine.