李国田,李腾腾,景晓军,李粟,王振宇,陈熊.不同海拔下国Ⅴ柴油机的性能和排放[J].内燃机工程,2017,38(6):29-34.
不同海拔下国Ⅴ柴油机的性能和排放
Performance and Emissions of a China Ⅴ Diesel Engine at Different Altitudes
DOI：
关键词:柴油机  海拔  性能  排放
Key Words:diesel engine  altitude  performance  emissions
基金项目:
作者单位
李国田,李腾腾,景晓军,李粟,王振宇,陈熊 中国汽车技术研究中心,天津 300300 
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摘要:对一台满足国Ⅴ排放要求的柴油机,分别在1700m、2200m、3000m海拔高度下采用可移动式发动机台架和车载设备,进行了高原实地的排放测试。原机测试结果表明,随着海拔的升高,缸内进气量减少,燃烧恶化,最高燃烧压力下降,比油耗增加,CO排放升高,NOx排放下降；海拔的升高对尾气排放具有降低氧含量和提高燃烧温度的双重作用,其中降低氧含量对高海拔排放的影响更大。采用后处理装置后,NOx排放虽有所下降,但由于发动机企业出于成本考虑减少尿素喷射量,使NOx排放仍超出国Ⅴ法规限值。
Abstract:A diesel engine satisfying China Ⅴ was tested at the altitudes of 1700m, 2200m and 3000m with a removable engine test bench and on-board equipment. The results of the test without urea-SCR show that, with the increase of altitude, intake air decreases, combustion deteriorates, the highest combustion pressure decreases, fuel consumption and CO emission increase, and NOx emissions decreases; increased altitude has dual effects of raising combustion temperature and reducing oxygen content on engine emissions, of which the later has greater impact on emissions at high altitude. The results of the test with urea SCR show that NOx emissions still exceed China Ⅴ regulation limits, because the engine manufacturer reduces the amount of urea injection.
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