Calibration and experimental research of in-use vehicle particulate emission measurement instruments
Aims:This paper aims to achieve the local technology and equipment for detecting the concentrations and particles in vehicle exhaust emissions.Methods:This study developed a nanoscale fine particle counting instrument based on the principle of nucleation growth counting.Adopting a self dilution structure and adjusting the temperature setting,calibration experiments were conducted in a controlled clean room environment.Results:With the use of a self-dilution structure and sampling temperature of 6～50℃,the D50 of the instrument reached 9.2 nm,meeting the detection requirements of 23±1 nm for motor vehicles.The transient response error of the instrument was 9.53％,the detection range was from 0 to 5×104 particles/mL,thus meeting the instrument error index.The on-site measurements of exhaust emissions from in-use vehicles showed that the developed condensation particle counter(CPC)accurately identified the changes in particle concentration across different magnitudes.Moreover,both the developed CPC and the TSI CPC exhibited peak relative error changes of less than 10％.Conclusions:The developed instrument meets the standard of motor vehicle exhaust testing with high consistency and detection ranges.
万方数据
维普
