分析了影响柴油机排气微粒测量的各种因素 ,包括取样、排气温度、混合气温度、稀释比、系统壁面的沉积及随后粒子再入等。发现混合气温度、稀释比、微粒传输管上的热泳沉积和随后的粒子再入对微粒测量影响较大 ,从而提出了改进微粒测量系统的若干建议以减小测试结果的变动 Various factors affecting the measurement of diesel engine exhaust particulates were analyzed, including sampling, temperature of exhaust gas, temperature of mixed gas, dilution ratio, deposition of system wall and subsequent particle reentry. It was found that the temperature of the gas mixture, the dilution ratio, the thermophoresis deposition on the microparticle transfer tubes and the subsequent particle rejections have a great effect on the measurement of the particles, thus proposing several suggestions for improving the particle measurement system in order to reduce the variation of the test results