农业机械学报2024，Vol.55Issue(z1)：405-411,426,8.DOI:10.6041/j.issn.1000-1298.2024.S1.043
单HST履带式拖拉机差速转向控制系统研究
Differential Steering Control System for Single HST Tracked Tractors
摘要
Abstract
To address the issues of poor stability,low steering control resolution,and severe soil damage caused by unilateral braking steering in the automatic steering control of a single hydro static transmission(HST)tracked tractor,a differential steering control system based on state feedback was proposed.Firstly,the mechanism of differential steering using a single HST was analyzed.Then,based on the kinematic model of the tracked tractor,a differential steering control method using pulse width modulation(PWM)was designed.This method improved steering control resolution and stability by precisely adjusting the stroke of the steering hydraulic cylinder.Next,a control system was developed with an STM32F4 microcontroller as the core,which integrated both linear path planning and steering control,completing the design of the onboard controller.Finally,field tests were conducted under three speed conditions on both cement and field surfaces.The test results showed that at speed of 2 km/h,3 km/h and 5 km/h,the mean absolute errors of straight-line tracking on the cement surface were 1.6 cm,2.2 cm and 3.1 cm,respectively,with standard deviations of 2.7 cm,2.9 cm and 3.6 cm.On the field surface,the mean absolute errors were 1.7 cm,1.9 cm and 2.9 cm,with standard deviations of 2.2 cm,2.1 cm and 3.4 cm,respectively.These results demonstrated that the system outperformed traditional unilateral braking steering in various environments,significantly improving steering accuracy and stability.关键词
履带式拖拉机/静液压传动/差速转向/控制方法Key words
tracked tractors/hydro static transmission/differential steering/control method分类
农业科技引用本文复制引用
秦维贤,张光强,胡书鹏,周豫鸽,温昌凯,付卫强,孟志军..单HST履带式拖拉机差速转向控制系统研究[J].农业机械学报,2024,55(z1):405-411,426,8.基金项目
国家重点研发计划项目(2022YFD200150302)、中国烟草总公司重点研发项目(110202301013-3)和智能农业动力装备全国重点实验室建设项目(PT2024-49) （2022YFD200150302）
