增压中冷柴油机净功率测量的不确定度研究  

Study on Uncertainty of Net Power Measurement of Turbocharged Intercooled Diesel Engine

作　　者：翟学超 李劲松 杨兆宇 白晓鑫 ZHAI Xuechao;LI Jinsong;YANG Zhaoyu;BAI Xiaoxin(CATARC Automotive Test Center(Tianjin)Co.,Ltd.,Tianjin 300300,China)

机构地区：[1]中汽研汽车检验中心(天津)有限公司,天津300300

出　　处：《内燃机》2024年第6期19-24,共6页Internal Combustion Engines

基　　金：国家自然科学基金资助项目(51176136)。

摘　　要：基于GB/T 17692-2024标准中的净功率测试方法,对增压中冷柴油机的净功率测量不确定度进行了探讨。通过在同一台发动机台架上独立运行8组重复性试验,对额定点的功率测量结果进行不确定度分析。将净功率的不确定度分解为实测转速、扭矩、校正系数等3个分量,并进行了A类与B类不确定度评定。研究结果表明,净功率的扩展不确定度为0.1274kW,置信概率为95%。该不确定度相对较小,表明发动机状态稳定、测量方法及设备精度较高,测量结果的可靠性良好。Based on the net power measurement in GB/T 17692-2024,the uncertainty of net power measurement of turbocharged intercooled diesel engine is deeply discussed in this study.Through running 8 sets of repeatability tests independently on the same engine bench,the uncertainty of the power measurement results at the rated point is carried out.The uncertainty of net power is evaluated by three components(measured speed,torque,correction coefficient)for Class A and Class B uncertainty.The results show that the extended uncertainty of net power is 0.1274 kW and the confidence probability is 95%.The uncertainty is small,which indicates that the engine state is stable,the accuracy of measurement and equipment is high,and the reliability of measurement results is good.

关 键 词：净功率 发动机台架 不确定度分量 扩展不确定度 

分 类 号：U464[机械工程—车辆工程]