液压机械无级变速器全工况效率模型及功率损失分析
S220; 针对目前液压机械无级变速器(hydro-mechanical continuously variable transmission,HMT)效率模型研究中存在的效率组成不全面、局限于单一工况以及缺少功率损失分析等问题,该研究建立了考虑传动元件及附件功率损失的HMT全工况效率模型.首先建立HMT变量泵-定量马达的通用效率模型,根据效率试验数据辨识相关参数;然后建立HMT其他传动机构及附件的效率模型,将各部分效率模型组合得到完整的HMT效率模型.基于自主研发的HMT进行计算,得到全工况效率图和各组成机构的损失功率.搭建试验台,对HMT进行效率试验以验证模型的准确性,HM1段和HM2段在...
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| Published in | 农业工程学报 Vol. 40; no. 11; pp. 48 - 58 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
燕山大学河北省特种运载装备重点实验室,秦皇岛 066000%北京理工大学机械与车辆学院,北京 100080
01.06.2024
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1002-6819 |
| DOI | 10.11975/j.issn.1002-6819.202311140 |
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| Abstract | S220; 针对目前液压机械无级变速器(hydro-mechanical continuously variable transmission,HMT)效率模型研究中存在的效率组成不全面、局限于单一工况以及缺少功率损失分析等问题,该研究建立了考虑传动元件及附件功率损失的HMT全工况效率模型.首先建立HMT变量泵-定量马达的通用效率模型,根据效率试验数据辨识相关参数;然后建立HMT其他传动机构及附件的效率模型,将各部分效率模型组合得到完整的HMT效率模型.基于自主研发的HMT进行计算,得到全工况效率图和各组成机构的损失功率.搭建试验台,对HMT进行效率试验以验证模型的准确性,HM1段和HM2段在全工况下的效率平均绝对误差分别为0.027 3和0.0261,相较于对比方法准确性提高了 64.59％和55.46％.结合效率图和功率损失情况分析HMT效率特性和影响因素,结果表明:1)本文HMT效率主要受负载和液压单元排量比e影响,输入转速影响不显著;2)低负载下本文HMT效率主要影响因素为负载,高负载下为排量比;3)泵马达功率损失对HMT效率影响最大,e＜0时液压损失功率大,HMT效率低;e=0时液压损失功率为0,HMT效率达到最高;4)齿轮和离合器的功率损失对HMT效率的影响不容忽略,考虑其他附件功率损失有利于提高模型计算精度.提高HMT效率的措施:1)尽量避免HMT长时间在功率循环工况下工作,在优先满足负载需求和保证发动机经济性前提下,推荐在纯机械点及其附近工作点作业;2)避免长时间低负载作业,应保持在高负载工况作业;3)选用高效率液压单元或通过改进参数提高液压单元传动效率;4)满足齿轮和离合器性能要求前提下改进参数,降低功率损失. |
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| AbstractList | S220; 针对目前液压机械无级变速器(hydro-mechanical continuously variable transmission,HMT)效率模型研究中存在的效率组成不全面、局限于单一工况以及缺少功率损失分析等问题,该研究建立了考虑传动元件及附件功率损失的HMT全工况效率模型.首先建立HMT变量泵-定量马达的通用效率模型,根据效率试验数据辨识相关参数;然后建立HMT其他传动机构及附件的效率模型,将各部分效率模型组合得到完整的HMT效率模型.基于自主研发的HMT进行计算,得到全工况效率图和各组成机构的损失功率.搭建试验台,对HMT进行效率试验以验证模型的准确性,HM1段和HM2段在全工况下的效率平均绝对误差分别为0.027 3和0.0261,相较于对比方法准确性提高了 64.59％和55.46％.结合效率图和功率损失情况分析HMT效率特性和影响因素,结果表明:1)本文HMT效率主要受负载和液压单元排量比e影响,输入转速影响不显著;2)低负载下本文HMT效率主要影响因素为负载,高负载下为排量比;3)泵马达功率损失对HMT效率影响最大,e＜0时液压损失功率大,HMT效率低;e=0时液压损失功率为0,HMT效率达到最高;4)齿轮和离合器的功率损失对HMT效率的影响不容忽略,考虑其他附件功率损失有利于提高模型计算精度.提高HMT效率的措施:1)尽量避免HMT长时间在功率循环工况下工作,在优先满足负载需求和保证发动机经济性前提下,推荐在纯机械点及其附近工作点作业;2)避免长时间低负载作业,应保持在高负载工况作业;3)选用高效率液压单元或通过改进参数提高液压单元传动效率;4)满足齿轮和离合器性能要求前提下改进参数,降低功率损失. |
| Abstract_FL | Aiming at the problems of incomplete efficiency composition,limitation to single working condition calculation and lack of power loss analysis in the current efficiency model research of hydro-mechanical continuously variable transmission(HMT),this study establishes a full-condition efficiency model of HMT considering the power loss of transmission components and accessories.Firstly,the general efficiency model of HMT variable pump-quantitative motor is established,and the relevant parameters are recognized according to the efficiency test data;then the efficiency models of other HMT transmission mechanisms and accessories are established,and the complete HMT efficiency model is obtained by combining the efficiency models of each part.Based on the self-developed HMT,the calculation is carried out to obtain the full working condition efficiency map and the loss power of each component mechanism,the test bench is built,and the efficiency test is carried out on the HMT to validate the accuracy of the model,and the average absolute errors of the efficiencies of the HM1 section and the HM2 section under full working condition are 0.027 3 and 0.026 1,respectively,which improve the accuracy of the HM1 section and the HM2 section by 64.59％and 55.46％respectively,comparing to the accuracy of the comparative methods.Combined with the efficiency diagram and power loss situation to analyze the HMT efficiency characteristics and influencing factors,the results show that:1)the HMT efficiency model in this paper is mainly affected by the load and the displacement ratio e of the hydraulic unit,and the influence of the input speed is not significant;2)the main influencing factors of this paper's HMT efficiency model are the load under the low load,and the displacement ratio under the high load;3)the power loss of the pump motor has the greatest influence on the HMT efficiency,and the hydraulic loss power is large when e＜0.The HMT efficiency is low;when e=0,the hydraulic loss power is 0,and the HMT efficiency reaches the highest;4)the power loss of gears and clutches does not have a negligible impact on the HMT efficiency,and the consideration of the power loss of other accessories is conducive to the improvement of the modeling accuracy.Measures to improve the efficiency of HMT:1)Try to avoid HMT working under power cycling conditions for a long time,and recommend operating at purely mechanical points and their nearby work points under the premise of prioritizing load demand and ensuring engine economy;2)Avoid prolonged low load operation,and should be kept in high load conditions;3)Select high-efficiency hydraulic unit or improve the transmission efficiency of the hydraulic unit by improving the parameters;4)Improve parameters to reduce power loss under the premise of meeting the performance requirements of gears and clutches. |
| Author | 李学良 张志林 荆崇波 彭增雄 杨树军 陈志强 |
| AuthorAffiliation | 燕山大学河北省特种运载装备重点实验室,秦皇岛 066000%北京理工大学机械与车辆学院,北京 100080 |
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| Author_FL | LI Xueliang JING Chongbo ZHANG Zhilin CHEN Zhiqiang YANG Shujun PENG Zengxiong |
| Author_FL_xml | – sequence: 1 fullname: ZHANG Zhilin – sequence: 2 fullname: LI Xueliang – sequence: 3 fullname: PENG Zengxiong – sequence: 4 fullname: JING Chongbo – sequence: 5 fullname: YANG Shujun – sequence: 6 fullname: CHEN Zhiqiang |
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| DocumentTitle_FL | Full-condition efficiency model and power loss analysis of hydro-mechanical CVT |
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| Keywords | 效率模型 hydro-mechanical continuously variable transmission power loss 液压机械变速器 agriculture machinery 功率损失 efficiency model 农业机械 |
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| Publisher | 燕山大学河北省特种运载装备重点实验室,秦皇岛 066000%北京理工大学机械与车辆学院,北京 100080 |
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| Title | 液压机械无级变速器全工况效率模型及功率损失分析 |
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