【摘要】 基于高原环境模拟试验台架，研究了不同海拔下国六柴油机全负荷和40%负荷工况下的动力性、经济性及排放特性，同时探讨了4 000 m海拔下发动机持续运行在低转速大负荷工况柴油机颗粒物捕集器（DPF）堵塞的可能性。结果表明：全负荷和40%负荷工况下随着海拔的上升，发动机的进气流量、空燃比、有效热效率，排气氧浓度、排气压力呈非线性减小，有效燃油消耗率、排气温度、NO_x排放呈不同幅度增加；动力性、经济性下降明显，排放性能恶化；全负荷工况对海拔的变化更加敏感，特别是低转速和高转速的性能降幅较大；国六柴油机在4 000 m海拔下持续运行在低转速大负荷工况，DPF内大量颗粒物沉积但再生困难，较短时间内被堵塞。更多还原

【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 NOxemission 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.更多还原