Electrostatic vehicle exhaust particle sensor for the evaluation of the diesel particulate filter (DPF)

柴油颗粒过滤器 微粒 柴油机排气 汽车工程 粒子(生态学) 柴油 柴油机 环境科学 柴油废气油液 废气再循环 废物管理 废气 化学 工程类 海洋学 有机化学 地质学
作者
Qiang Sun,Huanqin Wang,Jinxin Liu,Jitong Zhou,Gehang Huang,Fajun Yu,Huaqiao Gui
出处
期刊:Instrumentation Science & Technology [Informa]
卷期号:: 1-16 被引量:1
标识
DOI:10.1080/10739149.2024.2351522
摘要

A real-time electrostatic particle sensor has been developed to measure the concentration of soot in diesel exhaust. Based on the Venturi effect, the self-priming sampling probe of the sensor was designed to generate a pressure difference to drive particles into the detection region of the electrostatic trap. A detection module was developed for real-time measurement of the nanoamp current generated by charged soot within the probe. The microcurrent was amplified by the signal processing system of the sensor. To guarantee the precision of particles, it was essential to test the performance. The sensor was able to measure currents from −100 nA to −30 nA with a relative error of −0.01%. In addition, experiments comparing the sensor with a commercial instrument have shown that they correlate well. Furthermore, the standard deviation of the sensor was 0.001049 during a 36 h long-term test, which is lower than a commercial instrument with better stability. The sensor was investigated to demonstrate the detection of diesel particulate filter (DPF) failure. The results showed that the consistency between the sensor and the regulatory measurement equipment was good. The data ratios of the sensors installed at the front and rear of the DPF differed by many fold, which indicated that the sensor was able to determine the status of the exhaust system.
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