在用车PN快速检测可行性研究

Feasibility Study on Rapid Detection of PN In-Use Vehicles

基于国内外在用车PN检测法规、检测方法、原理及设备的调研,通过实际路检路查PN检测,发现使用自由加速法进行PN快速检测具有可行性;不同排放阶段车辆PN浓度差异较大,随着排放阶段的升高,PN浓度中位数下降;且相同原理PN检测设备,针对同一辆车所测得的PN浓度也存在差异;PN浓度较低时,PN检测设备的反应灵敏度降低。Based on research on domestic and international regulations, testing methods, principles, and equipment for vehicle PN detection, and through actual road PN detection, it was found that using the free acceleration method for rapid PN detection is feasible;There is a significant difference in PN concentration among vehicles at different emission stages, and as the emission stage increases, the PN concentration decreases;And with the same principle of PN detection equipment, there are also differences in the measured PN concentration for the same vehicle;When the PN concentration is low, the reaction sensitivity of the PN detection equipment decreases.