基于拖拉机燃油经济性HMCVT换挡规律的研究
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摘要
通过分析拖拉机燃油经济性指标和拖拉机经济性的影响因素,提出一种以拖拉机燃油消耗率最低和牵引效率最高为目标的燃油经济性换挡规律。根据拖拉机燃油最佳经济性,结合液压机械无级变速器(Hydraulic mechanical continuously variable transmission,HMCVT)的结构和传动特点,阐明实现拖拉机燃油经济性的要求。探究一种发动机燃油消耗率和液压机械无级变速器的传动效率之比最小为目标的经济性最佳的HMCVT下的发动机转速转矩曲线,通过与发动机外特性曲线比较,可以使各挡位都处于油耗最低的经济性区域,并保证拖拉机的速度稳定,符合经济性换挡规律。
Through the analysis of tractor fuel economy index and the influence factors of tractor economical efficiency,a kind of fuel economy shift rule with tractor minimum fuel consumption and traction as the goal of most efficient is put forward. According to the optimal fuel economy of the tractor,combined with the structure and transmission characteristics of the hydraulic mechanical continuously variable transmission(HMCVT),the requirements of realizing the fuel economy of the tractor are expounded. A kind of shift rule with optimum economical efficiency of HMCVT is explored,which taking ratio of engine fuel consumption to transmission efficiency of HMCVT is the smallest as the objective. By using the SimulationX,the simulation is carried on,it is concluded that the engine speed torque curves under various gear,through compared with outside the engine characteristic curve,can make all the gears are at the lowest fuel consumption economy area,and guarantee the stability of the speed of the tractor,conforms to the economical shift rule.
Through the analysis of tractor fuel economy index and the influence factors of tractor economical efficiency,a kind of fuel economy shift rule with tractor minimum fuel consumption and traction as the goal of most efficient is put forward. According to the optimal fuel economy of the tractor,combined with the structure and transmission characteristics of the hydraulic mechanical continuously variable transmission(HMCVT),the requirements of realizing the fuel economy of the tractor are expounded. A kind of shift rule with optimum economical efficiency of HMCVT is explored,which taking ratio of engine fuel consumption to transmission efficiency of HMCVT is the smallest as the objective. By using the SimulationX,the simulation is carried on,it is concluded that the engine speed torque curves under various gear,through compared with outside the engine characteristic curve,can make all the gears are at the lowest fuel consumption economy area,and guarantee the stability of the speed of the tractor,conforms to the economical shift rule.
引文
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[3]张明柱,王全胜,白东洋,等.基于拖拉机整机效率最大化的液压机械无级变速规律[J].农业工程学报,2016,32(21):74-78.
[4]张明柱.拖拉机多段液压机械无级变速器控制策略研究[D].西安:西安理工大学,2007:67-75.
[5]张鹏程.液压机械无级变速器的设计及特性研究[D].石河子:石河子大学,2017:32-33.
[6]席志强,周志立,张明柱.拖拉机动力换挡自动变速器经济性换挡规律研究[J].机械传动,2016,40(11):144-150.
[7]胡德民,姚瑞央.大功率拖拉机牵引机组虚拟样机模型研究及匹配优化[J].农机化研究,2013,35(7):20-23.
[8]张龙,师帅兵,王少辉.基于拖拉机燃油经济性自动换挡规律研究[J].拖拉机与农用运输车,2013,40(5):16-18.
[9]张永华.轮式铣刨机双速液压底盘性能匹配研究[D].西安:长安大学,2009:32-44.
[10]常亚磊,朱思洪,倪向东.拖拉机液压机械无级变速器换挡过程动态特性研究[J].拖拉机与农用运输车,2013,40(5):9-12.
[11]魏超,苑士华,胡纪滨,等.等差式液压机械无级变速器的速比控制理论与试验研究[J].机械工程学报,2011,47(16):101-105.
[12]李春东,李庆欣.基于传动系统的汽车燃油经济性优化匹配分析[J].汽车科技,2013(5):10-13.