车辆限重系统电路设计.doc

目 录
摘要 2
关键字 2
引言 2
1 概 述 3
2 车辆限重系统硬件电路的设计 3
2.1电阻应变式传感器 4
2.2 称重传感放大电路 5
2.3 称重传感电路的安装 5
2.4加法运算放大电路 6
2.5  ADC0804模/数转换器 6
2.6 8051单片机 8
2.7  驱动电路 9
2.8  GPS模块简介 10
2.9 车辆限重系统中电源的设计 11
2.10 车辆限重系统的总设计电路图 11
3  车辆限重系统的电路隐埋 13
4  车辆限重系统软件的设计 14
4.1车辆限重系统软件设计流程图 14
4.2软件设计的分析 16
4.3车辆限重系统的程序 16
5 小 结 18
致谢 18
参考文献 18
英文摘要 21

车辆限重系统电路设计

摘要：由于现在车辆超重现象严重，车辆限重系统的设计意义较为重大。本设计在现有普通车辆的基础上，安装了电阻应变式传感器，利用电阻敏感元件组成的惠斯登平衡电桥以及其电路输出电压与重量成线性关系的原理来称重，隐埋了称重传感放大电路、A/D转换器ADC0804、Mcs-51系列8051单片机、加法器以及DC-DC电源等。当车辆超重时，通过单片机的预置程序，使驱动电路工作，让控制车辆油路和控制车辆电路的继电器动作，对超重车辆进行管制，达到限制其启动的目的。此时一并发送超重信号给GPS，GPS与交通部门通讯，GPS定位超重车辆，交通部门用GPS向单片机反馈不同的信号，来决定对超重车辆的处理。当车辆不超重时，单片机程序判断后，使驱动电路不工作，不限制车辆的启动。                 
关键字：称重传感器；单片机；电路隐埋　

Design of the Heavy System of the Vehicle Limit

Abstract: As the phenomenon overweight of vehicle is serious now， the design significant of the heavy system of the vehicle limit is comparatively great. The design of the existing vehicles on the basis of the installation of the resistance strain sensor， use of sensor resistance of the Wheatstone bridge and balance their circuit output voltage and the linear relationship between the weight of the principle to weight. Implicit buried weighing sensor amplifier， A/D converter ADC0804， Mcs-51 series 8051 MCU ， adder and DC-DC power supply and so on.. When the vehicle is overweight， with procedure of presetting of MCU， it urge the circuit work to make， it control vehicle oil passage and control relay movement ， vehicle of circuit to let ， control the vehicle overweight， achieve the goal of limiting its start. At this time MCU send the signals overweight to GPS ， GPS makes communication with the traffic department ， the vehicle overweight of GPS's positioning in the lump at this moment ， the traffic department feedbacks different signals to the MCU with GPS， to determine the treatment to vehicle overweight. When the vehicle is not overweight ， drive circuit does not work， restrictions on the launch vehicle ， after procedure judges the MCU.
Keywords: Weighing sensor; MCU system  ; Circuit buried