Research on power system matching characteristics of the hybrid hydraulic and mechanical tractor

doi:10.13733/j.jcam.issn.20955553.2022.04.008

Abstract

Abstract: Aimingat the unreasonable matching scheme of the existing hydraulicmechanical compound drive tractor power system, which cannot meet the balance of tractor power and economy, a new optimization matching scheme is proposed.Based on the basic working conditions of tractors, the evaluation index system of matching performance between the engine and hydraulic torque converter is established. According to the entropy weight methodgrey relational analysis theory, the performance evaluation model is established to determine the output weight of the HMD power system. Design of variables, establishment of the objective function, and optimization of the effective diameter of the circulating circle of the hydraulic torque converter were accomplished. Comparative analysis of matching performance were also performed. The results show that the error of engine output characteristics is within 8%. The effective diameter of the circulating circle of the hydraulic torque converter is reduced by 0.7%. After optimization and matching, the average transmission efficiency of the power system is improved by about 2.3%. The fuel consumption rate is reduced by 7.3% compared with full power matching and 3.1% compared with partial power matching. The proposed optimal matching scheme can take into account the power and economy of the HMD tractor to a greater extent, improve the common operating range of the engine and the torque converter, and reduce the size parameters of the composite transmission system. It provides a new technical route reference and theoretical supplement for the development of independent highend agricultural machinery power systems.

Key words: tractor, hydraulic machinery, power system, matching characteristics, performance evaluation, model optimization

摘要： 针对现有液力机械复合传动（HMD）拖拉机动力系统匹配方案无法满足拖拉机动力性与经济性的平衡，提出一种新型优化匹配方案。根据拖拉机犁耕作业工况，建立发动机与液力变矩器匹配性能评价指标体系；基于熵权法—灰色关联度分析理论搭建性能评估模型，确定HMD动力系统输出权重；并对液力变矩器循环圆有效直径进行优化计算、匹配性能对比分析等。结果表明：以三次多项式拟合计算出发动机输出特性误差在8%以内；液力变矩器循环圆有效直径缩小0.7%；优化匹配后的动力系统平均传动效率提升约2.3%；燃油消耗率相较于全功率匹配减少7.3%，相较于部分功率匹配减少3.1%。提出的优化匹配方案能够较大程度兼顾HMD拖拉机作业时的动力性与经济性，改善发动机与液力变矩器共同作业区间，降低复合传动系统尺寸参数，同时为自主高端农机动力系统的发展提供新的技术路线参考和理论补充。

关键词: 拖拉机, 液力机械, 动力系统, 匹配特性, 性能评估, 模型优化

CLC Number:

S219

Li Xianzhe, Zhang Hui, Xu Liyou, Liu Mengnan, Yan Xianghai, Zhang Mingzhu.. Research on power system matching characteristics of the hybrid hydraulic and mechanical tractor[J]. Journal of Chinese Agricultural Mechanization, 2022, 43(4): 46-52.

李贤哲, 张辉, 徐立友, 刘孟楠, 闫祥海, 张明柱. 液力机械复合传动拖拉机动力系统匹配特性研究[J]. 中国农机化学报, 2022, 43(4): 46-52.

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