基于台架重复性的柴油机NOx排放测量影响因素研究

针对某电控高压共轨柴油机排放性能优化过程中出现的问题,基于柴油机试验台架的重复性,进行各参数变化趋势分析以及与NOx排放测量的相关性分析.在此基础上,进行了ESC变工况和持续恒工况的试验验证分析.结果表明:进气相对湿度、进气质量流量及燃油温度变化对ESC循环NOx排放测量的影响很小；在相同试验条件下,发动机进气质量流量...

Factors Influencing NOx Emission Measurement for Diesel Engine Based on Test Bench Repeatability

For the problem that occured during the emission optimization of an electronic control high-pressure common rail diesel engine,the trends of all parameters and the relativity between each parameter and NOx volume fraction were analyzed based on the test bench repeatability.Furthermore,the verification experiments of ESC variable conditions and constant conditions were carried out.The results show that the small amplitude variation of intake relative humidity,intake mass consumption and diesel temperature has little influence on the NOx emission measurement of ESC.Under the same experimental conditions,the influence of intake mass consumption on NOx emission is the largest,the intake relative humidity is following,and the influence on NOx emission is intensified when both trends are the same.Under little change of engine structure,the main factors that lead to the NOx difference between different experiments are intake mass consumption and diluted exhaust volume flow and they both have the greater influence on NOx emission.