1.山东交通学院汽车工程学院，山东 济南 250357；2.山东新凌志检测技术有限公司,山东 济南 250000
摘要：为保证轻型汽油车简易瞬态工况法排放检测结果真实、准确，测试和分析汽车底盘测功机、气体分析仪、气体流量分析仪等排放检测设备对简易瞬态工况法排放检测结果的影响规律并给出应对策略。实车测试结果表明：测功机加载功率、排气取样探头深度和氧传感器测量的准确性对检测结果有显著影响；NOx、CO、HC污染物排放随加载功率增大而增加；排气取样探头深度由100 mm减小至50 mm时，CO排放增加106%，HC排放增加239%，NOx排放增加98%；气体流量分析仪氧传感器所测环境氧气的体积分数由20.52%变化至20.79%时，CO排放增加124%，HC排放增加138%，NOx排放增加54%；改变气体分析仪取样管样气流量及长度、气体流量分析仪集气软管长度，NOx、CO、HC污染物排放呈波动式变化。
Abstract：In order to ensure the authenticity and accuracy of the result of the emission test of vehicle mass analysis system (VMAS) for light-duty gasoline vehicle, the influence of the automobile chassis dynamometer, catharometer, and gas flow analyzer of the emission testing equipment on the emission test results of short transient loaded mode is tested and analyzed, and the solution is given as well. The actual vehicle test results show that the loading power of the dynamometer, the insertion depth of the probe for the exhaust sampling, and the accuracy of the oxygen sensor in measuring environmental oxygen have significant effects on the test results, and the emission of NOx,CO,HC increases with the increase of the loading of the power. When the sampling depth of the exhaust probe decreases from 100 mm to 50 mm, the CO emission increases by 106%, the HC emission increases by 239%, and the NOx emission increases by 98%. When the environmental oxygen measured by the oxygen sensor of the gas flow analyzer changes from 20.52% to 20.79%, the CO emission increases by 124%, the HC emission increases by 138%, and the NOx emission increases by 54%. When the gas flow and the probe tube length of the catharometer and the probe tube length of the gas flow analyzer are changed, the change of the emission of NOx,CO,HC will fluctuate.
Keywords:short transient loaded mode; light-duty gasoline vehicle; emission test; influence factor; test analysis