《基于CAN总线的汽车组合仪表指针压装控制器的控制子系统》》-毕业论文.doc

摘要 PAGE PAGE I 摘 要 组合仪表是汽车的重要部件，对汽车的安全运行至关重要。本文设计的具有自动检测和自动压装的组合仪表压装系统采用双CPU模块化设计保证了控制的实时性和程序的结构化风格。 该系统由两个子系统组成，分别是人机子系统和控制子系统，人机子系统采用了89S8252处理器，此款处理器使用较为普遍，价格也适中。其显示部分为20x4字符点阵液晶模块，价格也较低廉。控制子系统采用了89C52微处理器和ADS8325转换芯片。两子系统用CAN总线进行连接，CAN总线接口包括总线控制和总线驱动两部分，前者选用了Philips半导体公司的SJA1000，在原PCA82C200基础上，增加了CAN2.0B协议，后者选用82C250。保证了信息的可靠传递和快速传递。 本系统能同时压装四仪表指针，适应目前大多数组合仪表为四仪表系统的情况，简称“四通道”。每通道均能独立检测压装过程中的压装力值，并根据设定的上线力值和下线力值实施控制和欠力或过力提示，以便重压和人工复检。 关键词：组合仪表；CAN总线；四通道 Abstrct Abstract Abstract Combination instrument is an important component of the car to the safe operation of the car is very important. This design has pressed the automatic detection and automatic combination instrument pressing system. This system uses double CPU modular design ensure control of real-time and procedure of the structural style. This system consists of two sub-systems separately is man-machine subsystem and control subsystem. Using the man-machine subsystem 89S8252 processor which have a reasonable price and common used. It shows part 20x4 character dot matrix LCD module is relatively cheap price. Control subsystem adopted 89C52 microprocessor and ADS8325 conversion chip. The two subsystems connect by CAN bus. The CAN bus interfaces including bus control and the bus driver two parts. The former chose SJA1000(come from NXP) which have increased CAN2.0 B based on PCA82C200. The latter select 82C250. This ensures information transfer reliable and fast. This system can pressed four meters pointer, which can adapt most current combination instrument for four instrumentation systems. It referred to as four channel. Each channel can independently testing in the process of being pressed value and according to the set value and referrals on-line control force value and owe force or power. That can convenient to press again and artificial review. Keywords: combination instrument; CAN bus; four channel 河北工程大学毕业设计说明书 辽宁石油化工大学毕业设计说明书 PAGE 39 目录 TOC \t 标题 1,1,二级标题,3,一级标题,2,章标题,1 摘 要 PAGEREF _Toc262