Research on Shift Strategy Optimization of Hydraulic Automatic Transmission System
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摘要: 重型特种车辆行驶在恶劣环境下,为了保护传动系统,要求不闭锁液力变矩器。本文提出了一种以提高液力变矩器液力工况下传动效率为目的的换挡策略优化方法。首先根据TR50矿车的实车数据制定最佳动力性换挡规律,然后分析液力变矩器工作特性,建立数学模型实时计算液力变矩器传动效率,建立优化目标函数,最后在最佳动力性换挡规律基础上对各挡位换挡点做出整体优化。在Simulink仿真系统模型上分别对优化前后的换挡规律进行仿真分析,结果表明,优化后的换挡规律在保证动力性的基础上明显提高了液力变矩器液力工况下的传动效率。Abstract: Heavy-duty special vehicles are often driven in harsh environments, and in order to protect the transmission system, the hydraulic torque converter is not blocked. In this paper, a shifting strategy optimization method is proposed to improve the transmission efficiency under hydraulic conditions of a hydraulic torque converter. Firstly, according to the actual vehicle data of the TR50 mine car, the optimal dynamic shift schedule is established. Secondly, after analyzing the working characteristics of the torque converter, a mathematical model to calculate the transmission efficiency of the torque converter in real time and an optimization objective function are then established. Finally, based on the optimal dynamic shifting rules, the overall shifting points of each gear are optimized. Simulation analysis of the shifting rules before and after optimization is carried out on the SIMULINK simulation system model. The results show that the optimized shifting law significantly improves the transmission efficiency of the hydraulic torque converter under the hydraulic condition on the basis of ensuring the dynamic performance.
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图 1 QSX520发动机调速特性曲线[13]
表 1 实车参数
参数名称 参数值 额定功率/kW 388 额定转速/(r·min-1) 2 100 最大功率/kW 414 最大扭矩/(N·m) 2 365 车轮半径/m 1.03 主减速器传动比 17.83 总传动效率 0.8 1~5挡传动比 4, 2.68, 2.01, 1.35, 1 车重/kg 45 000 表 2 油门为0.6时换挡点优化区间表
挡位 v-3 v-2 v-1 v v+1 v+2 v+3 1 6.19 7.19 8.19 9.19 10.19 11.19 12.19 2 10.72 11.72 12.72 13.72 14.72 15.72 16.72 3 15.29 16.29 17.29 18.29 19.29 20.29 21.29 4 24.23 25.23 26.23 27.23 28.23 29.23 30.23 表 3 油门为0.6时换挡点优化结果
挡位 v-3 v-2 v-1 v v+1 v+2 v+3 1 6.19 7.19 8.19 9.19 10.19 11.19 12.19 2 10.72 11.72 12.72 13.72 14.72 15.72 16.72 3 15.29 16.29 17.29 18.29 19.29 20.29 21.29 4 24.23 25.23 26.23 27.23 28.23 29.23 30.23 表 4 车辆运行参数
参数名称 参数值 滚动阻力系数 0.035 空气阻力系数 0.8 坡度 0.03 汽车迎风面积 5.6 m2 挡位 Ⅰ~Ⅴ 仿真时间 60 s -
[1] ECKERT J J, CORRÊA F C, SANTICIOLLI F M, et al. Vehicle gear shifting strategy optimization with respect to performance and fuel consumption[J]. Mechanics Based Design of Structures and Machines, 2016, 44(1-2): 123-136 doi: 10.1080/15397734.2015.1094669 [2] ZHAO X X, ING A H, AZAD N L, et al. An optimal gear-shifting strategy for heavy trucks with trade-off study between trip time and fuel economy[J]. International Journal of Heavy Vehicle Systems, 2015, 22(4): 356-374 doi: 10.1504/IJHVS.2015.073205 [3] 国香恩, 李艳. 工程车辆动态换挡规律研究[J]. 武汉理工大学学报(交通科学与工程版), 2009, 33(5): 839-842 doi: 10.3963/j.issn.1006-2823.2009.05.007GUO X E, LI Y. Study on dynamic shift schedule of construction vehicle[J]. Journal of Wuhan University of Technology (Transportation Science & Engineering), 2009, 33(5): 839-842 (in Chinese) doi: 10.3963/j.issn.1006-2823.2009.05.007 [4] 王继新, 龚大鹏, 张英爽, 等. 利用三参数自动换挡策略的轮式装载机传动系建模与遗传算法优化[J]. 吉林大学学报(工学版), 2011, 41(S1): 27-33 https://www.cnki.com.cn/Article/CJFDTOTAL-JLGY2011S1007.htmWANG J X, GONG D P, ZHANG Y S, et al. Modeling of wheel loader powertrain with three-parameters shift strategy and optimization with genetic algorithm[J]. Journal of Jilin University (Engineering and Technology Edition), 2011, 41(S1): 27-33 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-JLGY2011S1007.htm [5] 陈宁. 工程车辆节能换挡规律智能控制方法研究[D]. 长春: 吉林大学, 2005CHEN N. Study on intelligent control method for shift schedule saving energy of engineering vehicle[D]. Changchun: Jilin University, 2005 (in Chinese) [6] CHEN W Z, DAI P Q, CHEN Y L, et al. Optimal efficiency shift schedule of automatic transmission for construction vehicle[J]. Advanced Materials Research, 2012, 468-471: 2403-2408 doi: 10.4028/www.scientific.net/AMR.468-471.2403 [7] 鲍伟, 葛建军, 肖旭, 等. 湿式双离合器微滑摩控制关键问题研究[J]. 汽车工程, 2018, 40(10): 1192-1199, 1214 https://www.cnki.com.cn/Article/CJFDTOTAL-QCGC201810011.htmBAO W, GE J J, XIAO X, et al. A study on key issues of micro-slip control for wet dual-clutch[J]. Automotive Engineering, 2018, 40(10): 1192-1199, 1214 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-QCGC201810011.htm [8] 闫清东, 于涛, 魏巍. 液力变矩器闭解锁控制策略研究[J]. 机械科学与技术, 2013, 32(2): 160-163 https://journals.nwpu.edu.cn/jxkxyjs/article/id/5376YAN Q D, YU T, WEI W. Research on the lockup and unlock control strategy of torque converter[J]. Mechanical Science and Technology for Aerospace Engineering, 2013, 32(2): 160-163 (in Chinese) https://journals.nwpu.edu.cn/jxkxyjs/article/id/5376 [9] 陈清洪, 秦大同. 自动变速汽车神经网络三参数换挡策略[J]. 控制理论与应用, 2010, 27(11): 1580-1584 https://www.cnki.com.cn/Article/CJFDTOTAL-KZLY201011023.htmCHEN Q H, QIN D T. Neural-networked three-parameter gear-shift schedule for automated-manual-transmission car[J]. Control Theory & Applications, 2010, 27(11): 1580-1584 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-KZLY201011023.htm [10] 张小虎, 王立勇, 唐长亮. 基于T-S模糊神经网络自动换挡策略研究[J]. 北京信息科技大学学报, 2019, 34(1): 23-27 https://www.cnki.com.cn/Article/CJFDTOTAL-BJGY201901005.htmZHANG X H, WANG L Y, TANG C L. Automatic shift strategy based on T-S fuzzy neural network[J]. Journal of Beijing Information Science & Technology University, 2019, 34(1): 23-27 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-BJGY201901005.htm [11] 张晓聪, 孙良, 王伟达, 等东某矿用汽车动力性换挡规律设计及优化[J]. 车辆与动力技术, 2015(4): 36-41 https://www.cnki.com.cn/Article/CJFDTOTAL-BGTK201504008.htmZHANG X C, SUN L, WANG W D, et al. Design and optimization of shift schedule for a mining truck[J]. Vehicle & Power Technology, 2015(4): 36-41 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-BGTK201504008.htm [12] 张瑶. 混合动力工程车辆自动变速换挡策略及控制方法研究[J]. 南方农机, 2018, 49(24): 70 doi: 10.3969/j.issn.1672-3872.2018.24.057ZHANG Y. Research on automatic shift shift strategy and control method of hybrid electric vehicle[J]. South Agricultural Machinery, 2018, 49(24): 70 (in Chinese) doi: 10.3969/j.issn.1672-3872.2018.24.057 [13] 杨永存, 辛庆伟. 一种基于试验数据的发动机特性曲线拟合[J]. 海军航空工程学院学报, 2016, 31(3): 312-316 https://www.cnki.com.cn/Article/CJFDTOTAL-HJHK201603003.htmYANG Y C, XIN Q W. A fitting on engine characteristic map based on text data[J]. Journal of Naval Aeronautical and Astronautical University, 2016, 31(3): 312-316 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-HJHK201603003.htm [14] 高子茵, 杜明刚, 李慎龙. 液力自动变速器动力性换挡规律设计及优化[J]. 车辆与动力技术, 2019(1): 23-28 https://www.cnki.com.cn/Article/CJFDTOTAL-BGTK201901004.htmGAO Z Y, DU M G, LI S L. Design and optimization of dynamic shift law for hyclraulic automatic transmission[J]. Vehicle & Power Technology, 2019(1): 23-28 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-BGTK201901004.htm [15] 成岳华, 李翔晟, 罗俊勇. 汽车自动变速器换挡规律优化设计[J]. 计算机仿真, 2016, 33(4): 227-231 doi: 10.3969/j.issn.1006-9348.2016.04.048CHENG Y H, LI X S, LUO J Y. Optimization of shifting schedule for vehicle with automated mechanical transmission[J]. Computer Simulation, 2016, 33(4): 227-231 (in Chinese) doi: 10.3969/j.issn.1006-9348.2016.04.048 [16] 管良结, 张铁柱, 马永志. 基于Matlab/Simulink的工程车辆自动变速器换挡规律研究[J]. 青岛大学学报(工程技术版), 2016, 31(1): 89-93 https://www.cnki.com.cn/Article/CJFDTOTAL-QDDX201601023.htmGUAN L J, ZHANG T Z, MA Y Z. Shift schedule of automatic transmission of construction vehicle based on Matlab/Simulink[J]. Journal of Qingdao University (E & T), 2016, 31(1): 89-93 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-QDDX201601023.htm