SEMS系统引入机动车排放检测可行性研究

机动车排放实验室测试与实际道路测试结果间存在较大差距，目前实际道路测试普遍采用车载排放系统（portable emission measurement system，PEMS），但PEMS系统具有操作复杂、测试装置整体较重等缺点，急需简单易行的实际道路排放测试系统。基于传感器技术的机动车智能排放测试系统（smart emission measurement system，SEMS），结构简单，操作方便，将其引入机动车实际行驶排放检测非常必要，但国内缺乏SEMS系统测试应用相关研究。通过研究国内外SEMS系统现状，并开展相关对比测试试验，研究SEMS系统引入机动车排放检测可行性与存在的问题。结果表明：SEMS系统测试的颗粒物数量（PN）与PEMS测试结果的差异为10%~30%；氮氧化物（NO_x）排放量与实际道路对比测试结果差异较大，特别是激烈驾驶情况下，最大差异高达369%；PN和NO_x排放测试结果瞬时分布和累计分布趋势较为一致。基于测试试验及结果分析，探讨了SEMS系统引入机动车排放检测的可行性，提出SEMS系统引入机动车排放检测具备一定可行性，可用于NO_x和PN高排放车辆筛查。

Feasibility study on the introduction of SEMS technology to motor vehicle emission testing

There is a big gap between the motor vehicle emission laboratory test and the actual road test, and the actual road test generally uses portable emission measurement system (PEMS) technology, but PEMS test has the disadvantages of complicated operation and heavy test equipment, and there is an urgent need for simple and easy actual road emission test technology. Smart Emission Measurement System (SEMS), based on sensor technology for motor vehicles emission test, has a simple system structure and convenient operation, and it is very necessary to introduce it into the actual driving emission testing of motor vehicles. There was a lack of SEMS technology testing and application research in China. By studying the current research status of SEMS technology, and carrying out comparative test experiments, the feasibility of introducing SEMS technology into motor vehicle emission testing and the problems were studied. The results showed that the difference between the particle number (PN) tested by SEMS and PEMS technologies was in the range of 10%-30%. The actual road comparison test results of nitrogen oxides (NOx) emission had a large deviation, especially in the case of intense driving, and the maximum deviation was as high as 369%. The instantaneous distribution and cumulative distribution trends of PN and NOx emission test results were relatively agreeable. Based on the test experiments and result analysis, the feasibility of introducing SEMS technology into vehicle emission testing was explored, which had certain feasibility and could be used for NOx and PN high-emission vehicle screening.