液压机械无级变速装载机工况在线识别方法  

Online identification method for wheel loader working conditions with hydro-mechanical continuously variable transmission

作　　者：杨树军[1] 褚捷豪 彭增雄[2] 李学良 史正旭 张志林 Yang Shujun;Chu Jiehao;Peng Zengxiong;Li Xueliang;Shi Zhengxu;Zhang Zhilin(Hebei Key Laboratory of Special Delivery Equipment,Yanshan University,Qinhuangdao 066004,China;School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]燕山大学河北省特种运载装备重点实验室,秦皇岛066004 [2]北京理工大学机械与车辆学院,北京100081

出　　处：《农业工程学报》2022年第4期1-11,共11页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(51675462,52102429)。

摘　　要：液压机械无级变速装载机发动机转速与车速解耦,具有节油、高效的优点,为了解决其工况繁多、动力匹配问题,以某液压机械无级变速装载机为研究对象,基于液压机械状态参数开展了装载机负载估计理论分析和仿真,建立了负载估计模型,仿真结果表明该方法能准确估计液压机械段内负载,结果偏差在±4.69%以内。在负载估计方法基础上,建立液压机械无级变速装载机工况识别模型以及整车仿真模型,通过理论分析与仿真相结合的方法,得到液压机械无级变速装载机在线工况识别方法及对应速比控制策略。仿真结果表明,该方法能够准确识别装载机当前工况,满足实际工程要求,所提出的分工况速比控制策略与常规策略相比,单作业循环时间减少了2.43 s,作业效率提高了4.42%,总油耗降低了1.41%。研究为装备液压机械无级变速器的装载机及拖拉机等提高生产效率及燃油经济性提供了途径。A wheel loader has been widely used for shoveling and short-distance transfer of loose materials,such as loose soil,coal carbon,and garbage,particularly in construction sites,sand yards,brick factories,stations,freight yards,and farmland infrastructure.The multi-purpose and high-efficiency construction machine can also be used for hauling,grading,stacking,and palletizing operations.Generally,the loader can be equipped with hydro-mechanical continuously variable transmission(HMT)for fuel-saving and high efficiency,where the engine speed is decoupled from the vehicle speed.However,the engine is easy to stall,when the steering/working system works,due to the various working conditions and difficult power matching of the loader.In this study,the theoretical analysis and simulation research were carried out to estimate the load,where a loader equipped with the HMT was taken as the research object.The coupling model of the loader power system was established,including the engine,HMT,and steering/working system.The driving load estimation of loader was then implemented to evaluate the driving load of the loader,where the key parameters of hydro-machinery were taken as the input.The load estimation model of the steering/working system was constructed to combine with the driving load estimation,where the engine torque and hydro-machinery input speed were taken as the input.The simulation results show that the new model was accurately estimated the load within the hydro-machinery segment,where the error was within±4.69%.The working state of the loader steering/working system was clarified under the load estimation.The online identification model of working conditions was established,where the signals(such as vehicle speed,brake pedal opening,and vehicle acceleration)were taken as observation measurements.The working conditions of the loader were divided into the single driving,driving and steering/working combination,shoveling,single working,and rapid deceleration.The working characteristics of the loader under various wo

关 键 词：农业机械 液压机械无级变速器 装载机 负载估计 工况识别 控制策略 

分 类 号：TH132[机械工程—机械制造及自动化]