【作者】 贾爱芹；

【导师】 程安宁；

【作者基本信息】 西安科技大学 ， 机械电子工程， 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,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的差速器,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[1]。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Inte1 8051单片机为控制芯片,以最佳滑移率S为控制目标,采用PI模糊逻辑为控制算法,对粘性自动限滑差速系统进行了研究。系统开发包括四个方面的内容,一是粘性限滑差速器的机械结构设计;二是系统硬件电路的设计,包括系统扩展、人机通道及前后通道设计;三是系统软件设计,利用MATLAB软件的FUZZY LOGIC模块进行模糊控制算法设计和主程序设计;四是仿真系统设计,用MATLAB软件的SIMULINK模块对粘性限滑差速系统进行了仿真。结果表明:基于PI模糊控制的粘性自动限滑差速系统防滑性能好,自动化程度高,可实施性好。它克服了普通差速器只能平均分配转矩的缺点,提高了车辆在双附着系数路面上的动力性和通过性,改善了车辆的操纵稳定性,提高了车辆行驶的主动安全性。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 Inte1 8051 Single-Chip Computer 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 viscous automatic limited slip differential system. System development includes four aspects, the first is the mechanical structure design of viscous limited slip differential; the second is the circuit design of system’s hardware, its main contents comprise the design of system exploration, man-machine passage and forward\rear passage; the third is system software design, include the fuzzy logical algorism design by means of Matlab/Fuzzy logic module and main program design; the fourth is simulation system design, using Matlab/Simulink module to simulate the viscous limited slip differential system.The result indicates that the viscous automatic limited slip differential system based on the fuzzy logic control has better anti-skid quality,its automatization and practicality are well. It will overcome the shortcoming that ordinary differential could only distribute the torque equaly, improve vehicles’driving and passing property on the double adhesion coefficient road surface, operation stability and initiative safety.更多还原