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毕业设计-基于单片机的电液比例控制系统设计，共41页，15559字，附cad图纸、系统PCB图、任务书、文献综述等
摘要：随着微电子技术、智能技术、传感与检测技术等的快速发展以及向工程机械领域的不断渗透，现代工程机械正处于机电液一体化的崭新的发展时代。其中，电液比例控制系统具有控制精度高、安装使用灵活以及抗污染能力强等多方面优点，其应用领域日益拓宽。本文采用C8051F040微控制器为核心设计与开发的电压比例控制器，相对于传统的单片机所构成的电液比例控制系统，具有更高的稳定性、可靠性和实时响应能力。因此，其更能适应我国工程机械领域的应用环境。本文首先阐述了电液比例控制系统的发展历史，特点，以及分类情况。其次，介绍了整个控制系统的功能，并详细介绍了以C8051F040微控制器为核心的系统的硬件结构。接着，详细阐述了控制器与电液比例阀的接口电路，即由电机驱动芯片LMD18200构成的驱动电路的原理与设计。最后，本文讨论了整个系统软件部分的设计情况。
关键词：电液比例控制，C8051F,LMD18200,PID
Based on SCM electrohydraulic proportional control system design
Student:Liu Xin
Tutor:Cai Peizhong
(Oriental Science & Technology College of Hunan Agricultural University, Changsha 410128, China)
Abstract:With the rapid development of micro-electronics, intellectual technology, sensing and detection technology and the continuous penetration of them into the field of engineering mechanisms, modern engineering mechanism is in a new age of the integration of mechanism, electrics and hydraulic pressure. Electro-hydraulic proportional control system has a lot of advantages，such as the high control accuracy, the flexible installation and use, the strong resistance on contamination and so on ,so that the application of electro-hydraulic proportional control system has increasingly broadened. The Electro-Hydraulic proportional control system that based on C8051F040 controller in this paper has higher stability and dependability and real-time responsive capacity, compared to that based on traditional singlechips. Therefore, it can adapt to the application environment of the modern engineering mechanism better than other control systems in our country.Firstly, it is described the development history, basic principle and the classification of the Electro-hydraulic proportional control system in this paper.Secondly, this paper introduces the function of the whole control system and the basic hardware structure which is based on the C8051F040 controller in detail.Then, this paper elaborates the principle and the design process of the driver of the electro-hydraulic proportional control system which is consisted of the motor-driven chip LMD18200.At the last of this paper, it discusses the design of the program of the whole electro-Hydraulic proportional control system.
Key Words: Electro-hydraulic proportional control, C8051F, LMD18200, PID
目 录
摘要．．．．．1
关键词．．．1
1 前言．．．3
1.1 课题背景及目的 ．．3
1.2 国内外电液控制研究状况 ．．3
1.3 控制器概述．．．．．．．4
1.4 设计过程．5
1.5 本文的组成．．．．．．．5
2 电液比例控制技术．．．．．．．5
2.1 概述．．．．．6
2.2 电液比例控制技术的发展历史．．．．．．．7
2.3 电液比例控制的特点．．．．．．．8
2.4 电液比例控制系统的分类．．．8
2.5 电液比例控制系统的未来发展趋势．．．9
3 控制系统硬件结构．．．．．．10
3.1 控制系统功能概述10
3.1.1 硬件电路设计思路．．11
3.1.2 控制系统框图．．．．．．11
3.2 主制器C8051F040的介绍．．11
3.2.1 C8051F040概述．．．．11
3.2.2 C8051F040的组成及特性．．．．12
3.3 选型依据14
3.4 数字量输入输出模块．．．．．．14
3.5 中断管理模块．．．．15
3.6 串行通信模块．．．．16
3.7 电源块．．17
3.8 硬件抗干扰措施．．18
4 电液比例阀驱动电路的设计．．．．．．19
4.1 电液比例阀的简介19
4.2 设计思路19
4.3 方案实现20
4.3.1 LMD18200概述．．．．．20
4.3.2 LMD18200主要特性及引脚说明．．．．．．．20
4.3.3 LMD18200与C8051F040的连接．．．．．．．22
5 系统软件设计．．23
5.1 控制算法23
5.1.1 PID介绍．．23
5.1.2 PID程序设计．．．．．．24
5.2 主控制器程序设计26
5.3 中断程序设计．．．．27
5.4 数字量输入输出模块设计．．28
5.5 软件抗干扰措施．．29
结论．．．．30
参考文献31
致谢．．．．32
附录
附录A 系统程序
附录B 系统硬件原理方框图
附录C 系统程序图