Abstract: The emission of pollutants from non road diesel mobile machinery is closely related to atmospheric environmental quality. With the development of society, the number of non road mobile machinery is constantly increasing. Therefore, the importance of emission supervision and testing for such machinery is self-evident. After conducting experiments on non road four stage construction machinery using the portable emission measurement system (PEMS), the article compares the changes in emission levels of the machinery before and after removing invalid events using the power basis window method. It is found that the emission level of the machinery decreased by 11.2% after removing invalid events. The impact of data processing methods on emission results is analyzed, which provides a reference for future emission supervision and testing of non road mobile machinery.

Key words: Construction machinery; Power based window method; Effective events; Invalid event; PEMS

摘要： 非道路柴油移动机械污染物的排放与大气环境质量息息相关，随着社会的发展，非道 路移动机械的数量在不断增加，因此对此类机械排放监管和测试的重要性不言而喻。文章对 非道路四阶段工程机械利用便携式排放测试系统（PEMS）试验后，利用功基窗口法对比剔除 无效事件前后机械的排放水平变化，发现剔除无效事件后该机械排放水平降低了 11.2%，分 析了数据处理方法对排放结果的影响，为接下来非道路移动机械的排放监管和试验提供参考。

关键词: 工程机械；功基窗口法；有效事件；无效事件；PEMS