轻型车颗粒物质量测试影响因素试验研究

Experimental Research on the Effect Factors of the Light-Duty Vehicle Particulate Matter Mass Test

为提高轻型车颗粒物质量测试精度,通过试验对比分析了称重环境、滤纸预处理时间、背景颗粒物质量和空气浮力等因素对颗粒物质量测量结果的影响。试验结果表明,称重室内相对湿度越靠近45%,颗粒物质量测量的偏差越小,结果越稳定;在6~10 h的预处理时间段对滤纸进行称量,既能节约时间成本,又能保证测量精度;适当增加日常背景颗粒物测量频率,并绘制背景颗粒物质量变化图,能及时修正背景颗粒物的影响;空气浮力对颗粒物质量的影响主要是由大气压力的波动造成的,应及时对试验前、后滤纸质量进行浮力修正。

In order to improve the particulate matter mass testing precision of light duty vehicle,the influence of factors including weighing environment,filter paper pretreatment time,background particulate mass,air buoyancy,etc.,on the measuring accuracy of particulate mass was analyzed through test.The test results indicate that,the closer to 45% of the relative humidity in weighing chamber,the less deviation of the particle mass measurement will be,and the more stable the results will be.Weighing filter paper during the pretreatment period of 6 to 10 hours not only shortens time,but also ensures measuring accuracy.Appropriately increasing the routine background particulate measurement frequency and drawing the background particulate mass change chart can time correct the impact of background particulate.The influence of air buoyancy on the particulate mass is mainly caused by fluctuations of atmospheric pressure,therefore buoyancy of the filter paper mass shall be corrected on time before and after the test.