摘要
液力机械传动系统集合了机械传动和液力传动的优点,被广泛应用与重载式运输车辆,发动机和液力变矩器共同工作性能的优劣直接影响到整车的工作状态.根据液力-机械传动系统的结构特点,对发动机和液力变矩器的匹配原则和匹配评价指标进行分析;对发动机与液力变矩器共同工作特性,尤其是输入和输出特性进行求解;在此基础上,基于AOVAT 3.0对某款重型汽车发动机和液力变矩器的选型方案组成的动力传动系统进行仿真分析,分析柴油发动机和液力变矩器共同工作的性能.结果可知:选用的柴油发动机和液力变矩器匹配时,能为车辆提供较大的起动扭矩,共同工作范围内最大扭矩点为961.10Nm,与柴油机的最大净扭矩相比,留有约712.9Nm的储备扭矩;在液力变矩器高效区内发动机的功率利用率较高,对应的共同工作输入曲线交点的转速范围为(2094.9~2158.9)r/min,有足够的扭矩储备用于车辆的联合铲装工况,联合铲装工况对应的发动机燃油消耗率相对较低;全工况范围内功率输出系数和高效范围内功率输出系数分别达到0.4860和0.6669,这一匹配是比较理想的.
The hydraulic mechanical transmission system combines the advantages of mechanical transmission and hydraulic transmission,and is widely used in heavy-duty transportation vehicles.The working performance of the engine and the torque converter can directly affect the working status of the whole vehicle.According to the structural characteristics of hydraulic-mechanical transmission system,the matching principle and evaluation index of engine and hydraulic torque converter are analyzed.Solve the common working characteristics of the engine and the torque converter,especially the input and output characteristics.Based on AOVAT 3.0,the power transmission system is composed of a heavy duty automobile engine and hydraulic torque converter is simulated and analyzed.The common work performance of diesel engine and hydraulic torque converter is analyzed.The results show that it can provide a larger starting torque for the vehicle when the selected diesel engine and the torque converter are matched.The maximum torque point in the common working range is 961.10Nm.The power efficiency of the engine is high in the high efficiency zone of the torque converter.The speed range of the intersection point of the corresponding the input curve that works together is(2094.9~2158.9)r/min.There is sufficient torque reserve for combined shovel loading conditions of the vehicle.The fuel consumption rate of the engine for combined shovel loading condition is relatively low.The power output coefficient in the whole working condition and the power output coefficient in high efficiency range reach 0.4860 and 0.6669 respectively,which is an ideal match.
作者
王瑞红
李立琳
WANG Rui-hong;LI Li-lin(Huanghe Jiaotong University,He’nan Jiaozuo454950,China;Henan University of Engineering,He’nan Zhengzhou451191,China)
出处
《机械设计与制造》
北大核心
2020年第6期185-189,共5页
Machinery Design & Manufacture
基金
河南省自然科学基金(2018KJ064)。
关键词
重型汽车
发动机
液力变矩器
传动系统
共同工作性能
Heavy-Duty Automobile
Engine
Hydraulic Torque Converter
Transmission System
Cooperation Property
