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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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 
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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
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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
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