摘要
为研究柴油机进气节流对发动机低负荷工况排放的影响,选取某满足国家第六阶段污染物排放标准的6.234 L柴油机,在发动机台架上开展了美国加州低负荷循环(LLC)工况排放试验,并通过低负荷工况下进气节流的方式对发动机控制器(ECU)进行了标定优化,对比分析了优化方案对LLC工况下的排气温度、氮氧化物(NO_(x))排放量和油耗的影响。结果表明:进气节流能够有效提升低负荷工况下发动机排气温度,对LLC工况下的NO_(x)排放具有明显的改善作用。
To address the issue of the unsuitability of the original suspension parameters after upgrading a central motor electric vehicle to a In Wheel motor car,A half-car passive suspension model is established in MATLAB/Simulink to analyze the problem.The spring stiffness and damping coefficients of the front and rear suspensions are taken as independent variables,while the root mean square values of the vehicle's center of gravity acceleration,pitch angle acceleration,suspension deflection,and tire load are considered as optimization objectives.The grey wolf optimization algorithm is employed to search for the optimal stiffness and damping parameters.The simulation results show that after optimization,the handling stability of the suspension remains within a reasonable range,while the comfort level is improved by 12.73%.
作者
高涛
杜闯
汪晓伟
高寅祥
霍永占
Gao Tao;Du Chuang;Wang Xiaowei;Gao Yinxiang;Huo Yongzhan(CATARC Automotive Test Center(Tianjin)Co.,Ltd.,Tianjin 300300)
出处
《汽车工程师》
2023年第12期32-36,共5页
Automotive Engineer
关键词
低负荷循环工况
进气节流
柴油机
排放
Low Load Cycle(LLC)
Intake valve throttling
Diesel engine
Emission
