基于发动机稳态工况的整车WLTC循环油耗研究

Research on Vehicle WLTC Fuel Consumption Based on Engine Steady Working Conditions

根据欧6c/d WLTP(世界统一轻型车测试循环)定义,由车辆参数确定循环换挡策略,转鼓试验得到发动机工况点,聚类计算14个工况点及权重,模拟循环油耗。以Matlab为编程工具,建立了14点稳态工况代替WLTC循环模拟油耗的一套完整方法,包括WLTC换挡策略、整车转鼓试验和k-means聚类计算方法。14点模拟油耗结果百公里油耗8.90L,与转鼓试验百公里油耗9.19L相差3.16%,表明以发动机的稳态工况代替整车循环进行WLTC油耗分析是可行的,这将简化面向WLTC和欧6c/d指标的发动机燃烧开发和优化改进的标定策略,提高开发工作的效率。

In accordance with the regulation of Euro 6c/d world harmonized light vehicle test procedure （WLTP）, gear shift strategy was calculated based on vehicle properties, engine working conditions was obtained through vehicle chassis dyno test and 14 steady-state points with related weight adopted to analogize WLTC test fuel consumption were calculated through clustering algorithm. A method integrating calculation and test was developed using Matlab as the programming platform, and it was composed of WLTC gear shift strategy, vehicle chassis dynamometer test and k-means clustering algorithm. The deviation of 3. 16% between 8.90 L per 100 km of the analogical fuel consumption from the consequent 14 points and 9.19 L per 100 km of the chassis dyno test result implies the feasibility of utilizing certain steady working conditions to simulate vehicle WLTC test in fuel consumption analysis and a promising efficiency promotion in the development and optimization of the engines facing WLTC and Euro 6c/d emissions limitation, which is attributed to simplification of the calibration strategy.