不同海拔下国六柴油机性能试验研究

doi:10.19562/j.chinasae.qcgc.2022.12.014

Abstract

Abstract:

Based on the plateau environment simulation test bench， the power， economy and emission characteristics of the China VI diesel engine at different altitudes under full load and 40% load conditions are studied， and the possibility of the diesel particulate filter （DPF） blocking under 4 000 m altitude with the engine running continuously at low speed and high load conditions is also explored. The results show that the intake flow rate， air-fuel ratio， brake thermal efficiency， exhaust oxygen concentration and exhaust pressure of the engine decrease nonlinearly with the increase of altitude at full load and 40% load， while the brake specific fuel consumption rate， exhaust temperature and NO _x emission increase by different degrees； the power and economy decrease significantly and the emission performance deteriorates. The full load operating condition is more sensitive to the change of altitude， especially the performance at low and high speed decreases more. When the China VI diesel engine operates continuously at 4 000 m altitude at low speed under high load conditions， a large amount of particles is deposited in the DPF but regeneration is difficult， and it is blocked within a short time.

Key words: different atmospheric pressure, China VI diesel engine, diesel particulate filter, performance

Renxin Xiao,Daping Liang,Guisheng Chen,Shuang Liu. Experimental Study on Performance of China VI Diesel Engine at Different Altitudes[J].Automotive Engineering, 2022, 44(12): 1926-1935.

Figures/Tables 23

References 19

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参数	数值
发动机型式	直列六缸、增压中冷
缸径×行程/mm	105×120
排量/L	6.2
标定功率/kW	190 （2 100 r/min）
最大转矩/（N·m）	1 000 （1 200~1 700 r/min）
后处理型式	DOC+DPF+SCR+ASC

参数	数值
尺寸/mm	304.8×203.2
载体体积/L	14.8
载体材料	堇青石
涂层材料	三氧化二铝
结构型式	蜂窝状
工作温度/K	453~823

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Experimental Study on Performance of China VI Diesel Engine at Different Altitudes

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References 19

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