【作者】 黄培；

【导师】 程安宁；

【作者基本信息】 西安科技大学 ， 机械电子， 2008， 硕士

【摘要】 轮式工程机械工作环境比较恶劣,它不像履带式工程机械那样本身具有较强的防滑能力。因此,防滑差速系统的防滑能力对轮式工程机械来说是非常重要的。传统的轮式工程机械在差速方面,差速器的自锁系数变化范围小,防滑功能有限,易造成车辆的打滑而影响车辆的操纵稳定性、通过性,降低工作效率;在驱动过程中不能主动地适应外界条件的变化,难以实现自动控制。在工程机械朝着自动化方向发展的趋势下,显得越来越不合理。针对传统工程机械差速系统存在防滑功能不强的缺陷,本文提出以STC系列单片机为控制芯片,以最佳滑移率S为控制目标,采用PID模糊逻辑为控制算法,对自动防滑差速系统进行研究设计。论文根据防滑差速系统的工作原理,应用单个车轮运动的力学模型,指出粘着与滑移率的关系,并且分析了运动情况。其次以单片机为控制核心,设计防滑系统各部分的功能电路。分析比较防滑系统的控制策略,最终选择模糊PID算法进行控制。为了对所需的数据进行监控,本文基于Labwindows/CVI开发了控制界面,实现了用串口通信进行数据显示。经过多次实验证明,防滑差速系统的硬件电路设计合理可行,能够准确测量所需数据,从而计算、判断,然后及时控制输出。这将为防滑差速系统真正用于工程车辆提供实验依据。更多还原

【Abstract】 The working condition of wheeled construction machinery is quite bad. It does not like that of track construction machinery that had a high anti-skip capability. Therefore, the anti-skip ability of the differential system to wheeled construction machinery is very important. The varying range of self-locking coefficient of traditional wheeled construction machinery differential is small. Its anti-skip function is limited. This could be easy to cause the vehicle to slip and affect its handling stability, passing property and could lower working efficiency. Besides that, in the processing of driving, it can not initiatively adapt the change of working conditions and it is difficult to realize automatic control. Under the tendency of developing in the direction of automation, traditional wheeled construction machinery differential has become increasingly unreasonable.Aimed at these flaw of weak anti-slide function in traditional wheeled construction machinery, this paper takes STC Single-Chip as the control chip, adopts the best slip rate as the control objective, adopts PI fuzzy control logic as the control algorithm to investigate the characteristic of automatic limited slip differential system.At first, the contactable condition between wheel and rail in the antiskid process was researched in this paper. According to the basic theory of antiskid system, applying a single wheel model, the thesis analyzed the motional condition. Secondly, taking Single-chip Computer as the heart of control, all function circuits of antiskid system was designed. Analyzing and comparing the control strategy of antiskid system, advantages and disadvantages of common control parameters.The antiskid controlling software based on the control method of fuzzy PID was compiled. To monitor the data we need, the control interface based on Labwindows/CVI was designed and series communication was realized in the function . By many times of test, it proved that the design of the antiskid system is circuit was reasonable. The system could measure the accurately data we need and control the output timely according to calculation and judgment. It would provide experimental evidence to apply the antiskid system in the wheeled construction machinery really.更多还原