高原環(huán)境下天然氣發(fā)動機冷熱態(tài)WHTC測試循環(huán)對比試驗研究

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中圖分類號：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

隨著機動車排放法規(guī)限制的不斷提高，傳統(tǒng)內(nèi)燃機在后處理的研發(fā)投入成本不斷增加，再加之近年來新能源汽車的興起，導(dǎo)致傳統(tǒng)內(nèi)燃機產(chǎn)業(yè)遭受嚴(yán)重的沖擊。（剩余4270字）