基于单片机的汽车等速万向节的静强度试验台测控系统设计

基于单片机的汽车等速万向节的静强度试验台测控系统设计(任务书,开题报告,外文翻译,论文16000字,程序清单,电路原理图)
摘要
我国经济社会的不断发展，科技水平的不断进步，综合实力的逐渐增强，使得城市化的进程加快，公路交通事业发展迅速。越来越多的家庭选择以汽车作为出行工具，而等速万向节作为汽车的重要零部件，其对汽车的性能有着直接的影响。本文从实际应用的角度出发，根据单片机和硬件电路等内容，设计出了基于单片机的汽车等速万向节的静强度试验台。汽车等速万向节的静强度试验分为等速万向节转动时的扭角测量和扭矩测量，其中的扭角测量部分是通过等速万向节转动带动光电编码器转动并直接输出信号到单片机中，并在LCD液晶屏中显示实现的，扭角测量精度可达到一度；其中的扭矩测量部分是通过等速万向节转动带动扭矩传感器转动并输出扭矩信号，先后经过三运放高共模抑制比放大电路、同相比例放大电路、二阶RC无源低通滤波电路后输入到单片机中，最终在LCD液晶屏中显示实现的，扭矩测量分辨率可达到0.80N•m。本测控设计系统可以简单方便地实现等速万向节转动时扭角和扭矩的测量，但在精度方面仍需要进一步提高。
关键词：等速万向节；光电编码器；扭矩传感器；单片机

Abstract
China's economic and social development, the continuous progress of science and technology, the gradual increase of the comprehensive strength accelerate the process of urbanization and development of highway transportation. More and more families choose to take the car as a means of travel, and the constant velocity universal joint as an important part of the car, which has a direct impact on the performance of the car. based on the practical application point of view, the paper  explain the design of the static strength test bench of the car based on MCU according to the contents of the MCU and hardware circuit. The static strength test of automotive constant velocity universal joint is divided into the torsional angle measuring and measurement of torque,the torsional angle measuring part is driven by the rotation of the photoelectric encoder to direct output signal to the MCU when rotating constant speed universal joint, and display the data in the LCD screen , torsion angle measurement accuracy can be achieved one degree; the torque measurement part is through rotating torque sensor and output torque signal to three op amp high CMRR amplifier circuit,amplifier circuit, phase ratio of two order RC passive low-pass filter circuit ,then the signal is delivered to the MCU and display in the LCD screen through the rotation of the photoelectric encoder, the resolution of torque measurement can reach 0.80N•m.This measurement and control system can be simple and easy to realize the measurement of torque and twist angle of constant velocity joint, but it still needs further improvement in precision.

Key words:constant velocity universal joint; photoelectric encoder; torque 
sensor; mcu
 

目  录                      
第1章 绪论    1
1.1 研究目的及意义    1
1.2 国内外现状分析    2
1.3 方案选择    3
1.4 论文的主要内容    6
第2章 系统总体设计    8
2.1系统功能描述    8
2.2总体设计框图    8
2.3总体功能模块    9
第3章 功能模块设计    11
3.1 传感器的选择    11
3.1.1 光电编码器工作原理    12
3.1.2 扭矩传感器工作原理    13
3.2信号放大电路的选择    15
3.2.1三运放高共模抑制比放大电路    16
3.2.2同相比例放大器    17
3.3 滤波电路的选择    18
3.4AD转换模块    19
3.4.1 ADC0804的引脚连接方式    20
3.4.2 ADC0804的工作原理    21
3.4.3 AD转换程序    22
3.5 LCD液晶显示    24
3.5.1 LCD1602的硬件接口介绍    24
3.5.2 LCD1602的读写时序介绍    26
第4章 现象描述    30
第5章 精度分析    30
第6章 硬件成本核算    32
第7章 总结    33
7.1全文总结    34
7.2研究展望    35
参考文献    36
致谢    38