董伟 贾月玲   

 中国一拖集团有限公司技术中心； 上海同圆发动机测试工程技术研究中心；

【摘要】 本文研究并设计了一款柴油机颗粒排放全流稀释定容采样系统,采用了临界文丘里管做为的恒流装置,首次采用变频控制的罗茨风机做为动力源,并首次采用脉宽控制方式控制进入风机的排气恒温,大大提高了控制精度。本文对全流定容采样系统进行了流量测量精度的分析,研究表明,采用临界文丘里管做为全流稀释定容采样系统的恒流装置,精度完全可以达到法规要求。 

【关键词】 柴油机； 颗粒排放； 全流稀释定容取样系统； 精度； 

【Abstract】 The paper develops a Sampling System of Diesel Particulate Full-Flow Dilution Constant Volume.Its control precision is proved by using of the critical flow venturi nozzles to control the critical flow inlet conditions at constant values,where varied frequency Roots Blower provides power and exhaust temperature before the blower is controlled with pulse width method.Flow measurement precision is analyzed for the sampling system of full-flow dilution constant volume.Researches states that sampling...  

【Key words】 Diesel Engine； PM Emission； Full Flow Dilution； Precision；