柴油机高原性能及排放标定试验开发

Calibration Development of Altitude Performance and Emission for Diesel Engines

基于柴油机高原模拟台架进行了增压柴油机高原性能及排放特性的标定试验开发,实验结果表明:除低转速工况外,海拔在1700m时,柴油机基本无降扭;海拔在3000m时,降扭约5.5%,海拔在4500m时,降扭在16.7%到28%之间。相对于海平面,海拔在1700m/3000m/4500m时,最低有效燃油消耗率分别增加1.3%/1.9%/3.5%,上升幅度较小。优化的主喷正时及喷射压力随海拔升高而增大,能够弥补因进气流量降低导致的燃烧速率降低,燃烧重心CA50滞后的问题。开发的高原标定,柴油机增压器转速及涡前排温在机械限值以内。柴油机NOx比排放随海拔升高有所降低,但Soot随海拔升高显著增加,尤其是低转速。

Based on the diesel engine plateau simulation platform,the calibration development of altitude performance and emission characteristics of diesel engine was carried out.The experimental results show that except for low speed condition,the engine almost has no torque derate at 1700m;At 3000m,torque derate is about 5.5%;and at 4500m,the torque derate is between 16.7%and 28%.Compare to sea level,altitude with 1700m/3000m/4500m,minimum BSFC increasing with 1.3%/1.9%/3.5%.The optimized main injection timing and injection pressure increase with the increasing of altitude,which can make up for combustion rate decreasing and CA50 delaying caused by the decreasing of intake flow.Developed altitude calibration,diesel turbo speed and turbo inlet temperature within the mechanical limits.NOx emission of diesel engine decrease with altitude,but Soot increased significantly with altitude,especially at low speed condition.