山地拖拉机电控液压转向系统设计分析

Design Analysis on the Electric Hydraulic Steering System of the Mountain Tractor Based on Motor Control

为进一步提升山地拖拉机的工作效率及作业过程中转向系统的运转平稳性与准确性,采用电机控制技术,针对山地拖拉机的电控液压转向系统进行设计分析。基于转向控制的内部形成机理,建立了电控液压转向控制系统数学模型,对转向系统的核心部件进行参数选取,实现机身转向平稳机构设计。利用SolidWorks构建电控液压转向系统的物理模型,并结合3Dmax提供山地作业场景,从转向系统转矩控制与拖拉机行进速度变化角度进行转向仿真试验。试验结果表明:选取转向角度与转向平稳性作为评价分析参数,在角度范围-25°～25°之间变化时,每次变化角度误差在-0. 64°～+0. 94°的范围内,满足设计要求;转向试验过程中机身的转向平稳性控制在79. 8%以上,大于75%的设计指标,说明仿真试验可行。

In order to further improve the working efficiency of the mountain tractors and the running stability and accuracy of the steering system in the operation process,the widely developed motor control technology was adopted to design and analyze the electronic control hydraulic steering system of mountain tractors. Based on the internal formation mechanism of the steering control,the correct mathematical model of the electronic control hydraulic steering control system was set up,the parameters of the core components of the steering system were selected,the design of the steering mechanism of the fuselage was realized,and the physical model of the electronic control hydraulic steering system was constructed with SolidWorks,and the mountain operation scene was provided with the 3 Dmax. The steering simulation test was carried out from the angle of steering system torque control and the tractor speed. The test showed that the steering angle and steering stability were selected as the evaluation parameters. When the angle range was changed between-25°-25°,the angle error of each change was within the range of-0. 64°-+ 0. 94°,which could meet the design requirements. At the same time,the steering stability of the fuselage in the steering test was above 79. 8%,more than 75% of design index,which also showed that the simulation test was feasible,and the design and analysis thought would be great reference significance on the improvement of the mountain tractor steering system.