高原环境下天然气发动机冷热态WHTC测试循环对比试验研究

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中图分类号：U472.6 收稿日期：2025-03-15 DOI： 10.19999/j.cnki.1004-0226.2025.08.019

Comparative Experimental Study of Cold and Hot WHTC Test Cycles of Natural Gas Engines under Highland Environment

Dong Wenlong Li Shifeng Luo Fei Wang Guilong Zhao Bin Catarc Automotive Test Center（Kunming）Co.，Ltd.，Kunming 651701，China

Abstract： In this paper，a 13L natural gas engine complying with the National VI standard is taken as the test object，and the WHTC testconditionsareused tosimuate theemissonofpolutantsundertherealcoldand hotenginedriving，andtocompare the emissiondiferencesoftheWHTCtestcyclesatdiferentaltitudes.Theresultsofthestudyshowthat：undertheoperationofhotand coldstate，thediferenceitecyleorkofWHCoutputissallandwithteinceaseofaltitude，tecyceorkdecreasescotinuously，andthehgheritsaltude，themoreserous theatteuationis；inthecomparisonofotandcoldstate，themissonofWHTC testcycleofthecoldoperationisgenerallhigherthanthatofthhotstate，andtheonlythingisthattheratiooftheemissionof NOx is lower than that of the hot state，in which the emission rule of CO， NOx ，and PM is the same with the change rule of the altitude，but there is a differences in emissions.In addition，the TWC inlet temperature has a large effect on the NH3 emission，which is much higher in the cold state operation than in the hot state.

Keywords：Natural gasengine;Plateau;WHTC;Hot and cold states;Emissions

1前言

随着机动车排放法规限制的不断提高，传统内燃机在后处理的研发投入成本不断增加，再加之近年来新能源汽车的兴起，导致传统内燃机产业遭受严重的冲击。（剩余4270字）