6DD2920-0AR6

6DD2920-0AR6

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6DD2920-0AR6

隨著汽車電子技術(shù)的發(fā)展，越來越多的電子產(chǎn)品裝載到汽車上，*地提高了汽車的動(dòng)力性和舒適性，同時(shí)也增加了車內(nèi)布線的難度和成本。CAN（Controller Area Network）作為一種串行數(shù)據(jù)通信總線，由于具有良好的可靠性、實(shí)時(shí)性及靈活性，已經(jīng)成為標(biāo)準(zhǔn)（ISO11898）^[1]，在汽車電子系統(tǒng)中得到了廣泛的應(yīng)用。
　目前，在CAN系統(tǒng)設(shè)計(jì)中，使用zui多的是單片機(jī)外掛獨(dú)立的CAN控制器，如Philips公司的PCA82C200、SJA1000以及In公司的82526、82527等芯片。但是采用此類芯片的設(shè)計(jì)方案不利于系統(tǒng)集成化。本文以Microchip公司內(nèi)部集成的CAN模塊PIC18F258單片機(jī)為核心，介紹CAN總線電動(dòng)車窗控制系統(tǒng)的硬件電路結(jié)構(gòu)及軟件設(shè)計(jì)流程。由于PIC18F258單片機(jī)對(duì)CAN收發(fā)器PCA82C250進(jìn)行數(shù)據(jù)操作時(shí)只需要TXD、RXD兩條數(shù)據(jù)線，這樣就大大簡(jiǎn)化了硬件電路的設(shè)計(jì)，提高了系統(tǒng)的可靠性。
1 電動(dòng)車窗控制系統(tǒng)通信網(wǎng)絡(luò)的構(gòu)成
　電動(dòng)車窗控制系統(tǒng)通信網(wǎng)絡(luò)共有4個(gè)CAN節(jié)點(diǎn)電子控制器，分別是：左前門主控制器、右前門子控制器、左后門子控制器、右后門子控制器。采用CAN總線通信技術(shù)可以實(shí)現(xiàn)4個(gè)車門控制器之間的通信,如圖1所示。

　操作主控制器除了可以控制駕駛員的車窗玻璃升降外，還可以通過CAN總線控制其余乘客車窗玻璃的升降，同時(shí)子控制器也可控制各自位置車窗玻璃的升降。主控制器由Microchip公司的內(nèi)部集成了CAN模塊的PIC18F258單片機(jī)、6N137高速光電耦合器、PCA82C250總線收發(fā)器等三個(gè)主要部分組成?？紤]到設(shè)計(jì)成本和軟件編程的方便性，子控制器選用了與主控制器相同的芯片，且具有相同的硬件電路結(jié)構(gòu)。
2 功率驅(qū)動(dòng)芯片及其應(yīng)用電路
Motorola公司的功率驅(qū)動(dòng)芯片MC33486以其強(qiáng)大的功能和優(yōu)異的性能在汽車電子中得到了廣泛的應(yīng)用。此芯片的應(yīng)用模式為橋式結(jié)構(gòu)^[2],芯片內(nèi)部有2個(gè)MOSFET驅(qū)動(dòng)管MOS1、MOS2，外接2個(gè)低端MOSFET驅(qū)動(dòng)管MOS3、MOS4組成一個(gè)完整的H橋，實(shí)現(xiàn)車窗電機(jī)的正、反向控制。同時(shí)，利用Cur R端的電流鏡像功能可方便地實(shí)現(xiàn)過流保護(hù)和車窗的防夾功能，如圖2所示

SAGE 935AT Communications Test Set Multi-Function Portable VF TIMS BERT

NEC NEAX2000 IVP/IPS PN-4RSTC 4-Line Caller ID Receiver Card

JB DV-85N Platinum 3C-Stage Vacuum Pump

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Fluke 1911A Multi-Counter 2-Channel Portable Frequency Counter 5Hz to 250MHz

TTC 750E ATM Tester for Parts

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DWYER Series 475 Mark III Handheld Digital Manometer 475-0 NEW

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