Speed control of hydro-mechanical transmission based on MRAC algorithm

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Jan.2023, Vol.46 No.1: 6-14, 27

DOI: 10.3969/j.issn.1003-5060.2023.01.002

Authors

TANG Xiwen $ ^{1} $, WU Shilong $ ^{1} $, ZHU Maofei $ ^{2} $, CHEN Jianshan $ ^{3} $, XIA Guang $ ^{3} $

(1. College of Electronic Engineering, National University of Defense Technology, Hefei 230037, China; 2. School of Advanced Manufacturing Engineering, Hefei University, Hefei 230601, China; 3. Institute of Automotive Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: In order to make the speed of tractor quickly recover and stabilize under the influence of the variation of operating resistance, a hydro-mechanical transmission(HMT) system is designed. The vehicle speed is adjusted through the real-time adjustment of the engine throttle pedal opening and the change of the pump displacement with electro-hydraulic servo controlled plunger pump swashplate tilt. Considering the strong nonlinearity, large time-varying parameters and external load interference of electro-hydraulic servo mechanism, the model reference adaptive control(MRAC) algorithm is applied to the electro-hydraulic servo actuator of hydraulic pump displacement regulation. The results show that the designed HMT system can effectively restore the stable driving state when the tractor encounters the speed change caused by the variation of the operating resistance. The electro-hydraulic servo actuator of MRAC can accurately adjust the displacement ratio of the hydraulic system to realize the change of vehicle speed, simplify the operation of speed change, and ensure the engine to work in the high efficiency zone, thus making the operating speed of the tractor quickly recover to a stable range.

Keywords: tractor; hydro-mechanical transmission(HMT); plunger pump; electro-hydraulic servo; model reference adaptive control(MRAC)

作者信息

唐希雯 $ ^{1} $，吴世龙 $ ^{1} $，朱茂飞 $ ^{2} $，陈建杉 $ ^{3} $，夏光 $ ^{3} $

(1. 国防科技大学电子对抗学院, 安徽合肥 230037; 2. 合肥学院先进制造工程学院, 安徽合肥 230601; 3. 合肥工业大学汽车工程技术研究院, 安徽合肥 230009)

摘要和关键词

摘要: 为使拖拉机作业过程中车速在受到作业阻力变化的影响下能迅速恢复稳定,文章设计一种双流传动(hydro-mechanical transmission, HMT)系统。通过实时调节发动机油门踏板的开度和改变电液伺服机构控制柱塞泵斜盘倾角的泵排量方式对车速进行调节;考虑到电液伺服机构存在强非线性、大时变参数以及外负载干扰等因素,将模型参考自适应控制(model reference adaptive control, MRAC)算法应用在液压泵排量调节的电液伺服执行机构中。结果表明:所设计的HMT系统在拖拉机遇到作业阻力变化引起车速变化时能有效地恢复稳定行驶状态;采用MRAC的电液伺服执行机构能够精确调节液压系统排量比来实现车速的改变,在简化变速操作的同时保证发动机工作在高效区,使拖拉机工作车速快速恢复到稳定区间。

关键词: 拖拉机；双流传动（HMT）；柱塞泵；电液伺服；模型参考自适应控制（MRAC）

Funding

国家自然科学基金资助项目(51875151); 科技部重点研发计划资助项目(2016YFD0700604; 2016YFD0700605) 和安徽省重大专项资助项目(18030701193)

合肥工业大学学报(自然科学版)

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