【正文】 I 摘 要 本設(shè)計(jì)致力于汽車 CAN 總線儀表系統(tǒng)的研究，深入討論了系統(tǒng)的設(shè)計(jì)思想與實(shí)現(xiàn)方法，實(shí)現(xiàn)了在 LabVIEW 開發(fā)平臺上建立基于 CAN 總線的虛擬儀表系統(tǒng)。 整個(gè)設(shè)計(jì)分為硬件系統(tǒng)和軟件系統(tǒng)兩部分。其中硬件系統(tǒng)是以飛思卡爾公司的MC9S12XS128 作為微處理器的核心。軟件系統(tǒng)是利用 C 語言編寫程序?qū)崿F(xiàn)兩個(gè) CAN節(jié)點(diǎn)之間的通訊以及利用 LABVIEW 編程實(shí)現(xiàn)單片機(jī)與虛擬儀表之間的通訊。 系統(tǒng)首先構(gòu)建了一個(gè)由兩個(gè) CAN 節(jié)點(diǎn)組成的最簡單的 CAN 網(wǎng)絡(luò)。對兩個(gè)節(jié)點(diǎn)進(jìn)行軟件設(shè)計(jì)后，來實(shí)現(xiàn)相互 之間的通訊和數(shù)據(jù)收發(fā)，同時(shí)在汽車的 CAN 應(yīng)用層協(xié)議基礎(chǔ)上，上位機(jī)節(jié)點(diǎn)對接收的 CAN 報(bào)文進(jìn)行處理，得到虛擬儀表各控件所對應(yīng)的數(shù)據(jù)。其中，基于 LabVIEW 的虛擬儀表系統(tǒng)開發(fā)和單片機(jī)的 C 語言編程是本設(shè)計(jì)的重點(diǎn)和難點(diǎn)。 關(guān)鍵詞 ： CAN 總線；汽車儀表； LabVIEW； C 語言；單片機(jī) 全套圖紙，加 153893706 II ABSTRACT This paper researches automotive instrument based on CAN bus, deeply discusses the idea and the method of system design and brings forward the approach of design the automotive emulational virtual instrument system on the platform of LabVIEW software. The whole design of hardware system and software system is divided into two parts. One of the hardware system is the MC9S12XS128 as freescale39。s pany core microprocessor. A software system is using written in C language program realization of the munication between two CAN node using G language preparation and MCU and virtual instrument LABVIEW realization of the munication between. To construct a system first posed by two CAN node of the most simple CAN work. Two nodes software design, to realize mutual munication and data transceiver, meanwhile in automobile CAN applicationlayer protocol basis, PC node to receive message processing, CAN get virtual instrument corresponding each control the data. Among them, the LabVIEW virtual instrument based on SCM system development and the C programming language is the design of the key and difficult. Key words: CAN Bus； Automotive Instrument； LabVIEW； C Language； SCM 目 錄 摘要 ...................................................................................................................................... Ⅰ Abstract ............................................................................................................................... Ⅱ 第 1 章 緒論 ....................................................................................................................... 1 課題研究的目的和意義 ........................................................................................... 1 汽車 儀表 的發(fā)展 ....................................................................................................... 2 CAN 總線技術(shù)推動汽車儀表的升級換代 .............................................................. 2 研究的基本內(nèi)容 ....................................................................................................... 3 第 2 章 CAN 總線原理 ................................................................................................... 5 汽車總線 ................................................................................................................... 5 CAN 總線 .................................................................................................................. 5 CAN 總線簡介 ................................................................................................. 5 CAN 總線基本特點(diǎn) ......................................................................................... 7 CAN 總線通訊介質(zhì)訪 問控制方式 ................................................................. 7 CAN 總線的物理層設(shè)計(jì) ................................................................................. 8 CAN 應(yīng)用軟件設(shè)計(jì)原則 ................................................................................. 8 汽車的其他總線 ....................................................................................................... 8 LIN 總線簡介 ................................................................................................... 8 FLEXRAY 總線簡介 ........................................................................................ 9 MOST 總線簡介 ............................................................................................. 10 汽車總線比較 ..................................................................................................11 汽車通訊協(xié)議 ..........................................................................................................11 SAE J1939 通訊協(xié)議 .......................................................................................11 CAN 總線協(xié)議 ............................................................................................... 12 本章小結(jié) ................................................................................................................. 15 第 3 章 汽車智能儀表系統(tǒng)的硬件設(shè)計(jì) .................................................................. 16 硬件系統(tǒng)的組成 ..................................................................................................... 16 微處理器 的選擇 ..................................................................................................... 17 微處理器的介紹 ..................................................................................................... 17 MSCAN 總線模塊 .................................................................................................. 18 CAN 總線節(jié)點(diǎn)的搭建 ............................................................................................ 21 串行接口 電路 的 設(shè)計(jì) ............................................................................................. 22 按鍵 電路設(shè)計(jì) ......................................................................................................... 22 電位計(jì) 電路設(shè)計(jì) ..................................................................................................... 22 本章小結(jié) ................................................................................................................. 24 第 4 章 汽車智能儀表系統(tǒng)的軟件設(shè)計(jì) .................................................................. 25 LABVIEW 簡介 ...................................................................................................... 25 下位機(jī)主程序流程圖 ...................