摘要
考虑道路阻力系数建立履带车辆各挡位间换挡计算模型,分析了不同地区百公里直驶行程中各挡位换挡频次并进行道路试验验证。基于集总热阻网络理论改进换挡离合器液压系统平均温升模型,利用Simulink仿真,分析了换挡频次和冷却润滑油流量对离合器温升的影响。与台架试验对比表明:改进模型更接近试验结果,随着润滑油流量增加,温升速率减缓,对本文研究对象而言,单摩擦副润滑油流量以1.5~2L/min为宜;随着换挡频次增加,温度不断升高。通过对比分析平原、高原和湿热地区换挡频次对离合器温升的影响,拟合出温升与换挡频次的预测关系式:平原和高原地区3挡和4挡间的换挡频次最多,CL和CH离合器温升较高,湿热地区2挡和3挡间的换挡最为频繁,4个换挡离合器温升都高达82.9℃。
A model for calculating the frequency of gear shifting of a tracked vehicle is set up with consid-eration of road resistance coefficients,to analyze the shifting frequency with different gears in a hundred kilometer straight driving in different regions. An average temperature rise model for the hydraulic system of shifting clutches is modified based on lumped heat resistance network theory and a Simulink simulation is conducted to analyze the effects of shifting frequency and cooling lubricant flow rate on the temperature rise of clutches. The results of com-parison between simulation and bench test show that the simulation results with modified model is closer to test ones,temperature rise rate reduces with the increase of lubricant flow rate,and for the study object in this paper,the appropriate lubricant flow rate for single friction pair should be in the range of 1. 5 ？2L/min,and the tempera-ture rises when shifting frequency increases. By comparatively analyzing the effects of shifting frequency on the temperature rise of clutches in plain,plateau and hot-humid regions,a predicted relationship between temperature rise and shifting frequency is fitted. In plain and plateau regions, the highest shifting frequency occurs between 3rd gear and 4th gear,with more temperature rises in clutches CL and CH,while in hot-humid regions,the shift-ing between 2nd rear and 3rd gear is most frequent,with the temperature rises in four shifting clutches all as high as up to 82. 9℃ .
出处
《汽车工程》
EI
CSCD
北大核心
2017年第5期535-542,共8页
Automotive Engineering
基金
国家自然科学基金(51575042)
工信部基础产品创新科研项目(VTDP-3203)资助
关键词
车辆工程
离合器
换挡频次
集总热阻网络
vehicle engineering
clutch
shifting frequency
lumped heat resistance network
