基于CAN總線的汽車大容量數(shù)據(jù)采集與監(jiān)測系統(tǒng)研究
本文關(guān)鍵詞:基于CAN總線的汽車大容量數(shù)據(jù)采集與監(jiān)測系統(tǒng)研究 出處:《重慶大學(xué)》2016年碩士論文 論文類型:學(xué)位論文
更多相關(guān)文章: 數(shù)據(jù)采集 閃存 錯誤檢查和糾正 無線傳輸 無損壓縮
【摘要】:隨著電子信息技術(shù)在汽車上的大量運用,汽車數(shù)據(jù)采集與狀態(tài)監(jiān)測成為汽車研發(fā)、生產(chǎn)和駕駛過程中的重要環(huán)節(jié)。通過對汽車數(shù)據(jù)的采集與分析,能夠?qū)ζ嚥考墓收线M行預(yù)防與排除;能夠了解用戶的駕駛習(xí)慣,提供駕車輔助和危險提醒;能夠?qū)ζ囄恢门c車身關(guān)鍵信息進行監(jiān)測,獲取汽車運行狀況。在國家863項目“雙離合自動變速器產(chǎn)業(yè)化技術(shù)開發(fā)”的支持下,論文研究了基于CAN總線的汽車大容量數(shù)據(jù)采集與監(jiān)測系統(tǒng),主要研究內(nèi)容如下:(1)論文根據(jù)雙離合自動變速器(DCT)實驗要求,分析了汽車大容量數(shù)據(jù)采集與監(jiān)測系統(tǒng)的基本需求、擴展需求和應(yīng)用軟件需求,提出了該系統(tǒng)的設(shè)計方案。該方案包括終端、無線網(wǎng)絡(luò)和應(yīng)用軟件三部分。其中,終端從汽車CAN總線采集實時數(shù)據(jù)并校驗存儲,同時將關(guān)鍵數(shù)據(jù)壓縮后發(fā)送到無線網(wǎng)絡(luò);無線網(wǎng)絡(luò)分為無線傳感網(wǎng)絡(luò)和運營商網(wǎng)絡(luò),為數(shù)據(jù)提供無線傳輸?shù)耐?應(yīng)用軟件通過無線接口或USB獲取并處理數(shù)據(jù),同時對汽車進行監(jiān)測。(2)設(shè)計了終端系統(tǒng)的硬件與軟件方案,包括終端硬件選型、處理器軟件設(shè)計、CAN數(shù)據(jù)采集軟件設(shè)計、數(shù)據(jù)存儲軟件設(shè)計和USB數(shù)據(jù)傳輸軟件設(shè)計。針對傳統(tǒng)通過傳感器進行數(shù)據(jù)采集可靠性低的問題,設(shè)計了數(shù)據(jù)接收策略和自定義數(shù)據(jù)幀組織方法,保證了數(shù)據(jù)的實時性和可靠性;針對存儲地址掉電易失的問題,設(shè)計了基于LPC1768和STC89C52的主協(xié)處理器模式,利用閃存(NAND Flash)和RAM進行備份存儲,以保證存儲地址的正確性。(3)針對汽車數(shù)據(jù)在大容量NAND Flash存儲過程中存在壞塊的問題,提出了自適應(yīng)錯誤檢查和糾正算法(ECC),設(shè)計了壞塊管理、數(shù)據(jù)精確定位方法,解決了數(shù)據(jù)因?qū)懭雺膲K而出錯的問題,保證大容量數(shù)據(jù)存儲的正確性。針對汽車數(shù)據(jù)量大和無線傳輸帶寬受限的矛盾,提出了一種自定義幀格式數(shù)據(jù)的無損壓縮方案,在保證傳輸有效性的情況下降低了無線傳感網(wǎng)絡(luò)功耗和運營商網(wǎng)絡(luò)流量資費,更適合自定義幀格式汽車數(shù)據(jù)的壓縮。(4)設(shè)計了系統(tǒng)應(yīng)用軟件,實現(xiàn)了數(shù)據(jù)導(dǎo)出、數(shù)據(jù)轉(zhuǎn)換、波形顯示、地圖定位等功能,可用于分析汽車數(shù)據(jù)和監(jiān)測汽車位置、車速等關(guān)鍵信息。(5)將開發(fā)的基于CAN總線的汽車大容量數(shù)據(jù)采集與監(jiān)測系統(tǒng)應(yīng)用到重慶青山工業(yè)有限責(zé)任公司的DCT實驗。實驗結(jié)果顯示,該系統(tǒng)能實時采集與存儲汽車數(shù)據(jù),應(yīng)用軟件能有效分析數(shù)據(jù)并對汽車進行監(jiān)測,達到需要的功能要求。
[Abstract]:With the large use of electronic information technology in automobiles, auto data acquisition and state monitoring have become an important link in the process of automobile R & D, production and driving. Through the collection and analysis of vehicle data, we can prevent and exclude the faults of automobile components. We can understand users' driving habits, provide driving assistance and danger warning, monitor the key information of vehicle position and body and get the running status of automobiles. In the National 863 project "dual clutch automatic transmission industry technology development", this paper studies the CAN bus and large capacity data acquisition and monitoring system based on the main research contents are as follows: (1) according to the dual clutch automatic transmission (DCT) experiment, analyzes the basic requirements of automobile, large capacity the data acquisition and monitoring system for the expansion needs and requirements of the application software, puts forward the design scheme of the system. The scheme consists of three parts: terminal, wireless network and application software. Among them, real-time data acquisition and storage terminal check from CAN bus, while the key data compression and sent to the wireless network; wireless network consists of wireless sensor network and network operators, provide access for wireless transmission of data; application software through the wireless interface or USB data acquiring and processing, at the same time to monitor the car. (2) design the hardware and software solutions of the terminal system, including hardware selection, processor software design, CAN data acquisition software design, data storage software design and USB data transmission software design. Aiming at the problem of low reliability of data acquisition through the sensor, the design of the data receiving strategy and custom data frame organization method, guarantee the real-time and reliability of data for storage; address problems electrical nonvolatile, design LPC1768 and STC89C52 main coprocessor model based on the use of flash memory (NAND Flash) backup storage and RAM, in order to ensure the correctness of the storage address. (3) for the automotive data exist bad block problem in large capacity NAND Flash memory process, the adaptive error checking and correction algorithm (ECC), the design of the bad block management, data accurate positioning method, solves the data because of the bad block and write the problem of error, ensure the correctness of large capacity data storage. According to the large amount of data and the limited bandwidth of wireless transmission between proposed lossless compression scheme of a custom data frame format, in ensuring the transmission efficiency reduces the power consumption of wireless sensor network operators and network flow rates, more suitable for the custom frame format of data compression. (4) designed the system application software, realized data export, data conversion, waveform display, map location and other functions. It can be used to analyze the key information of vehicle data and monitor vehicle location and speed. (5) the vehicle large capacity data acquisition and monitoring system based on CAN bus is applied to the DCT experiment of the Chongqing Qingshan industrial limited liability company. The experimental results show that the system can collect and store vehicle data in real time, and the application software can effectively analyze the data and monitor the car to achieve the required functional requirements.
【學(xué)位授予單位】:重慶大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:U463.6
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