【正文】 圖 12昏暗自動發(fā)光控制系統(tǒng)電路圖 圖中 R是 2CU2B型光敏電阻。 昏暗自動發(fā)光控制系統(tǒng) 昏暗自動發(fā)光控制系統(tǒng)， 是針對行車中車前自然光照強度降低到一定程度時，為保證行車安全，自動接通前照燈電路而設(shè)計的，該系統(tǒng)采用時基集成電路，具有抗振，抗干擾能力強，外圍元件用量少等特點。 前照燈與路面的間距決定了前照燈的照明范圍。該系統(tǒng)能根據(jù)汽車載重量的變化自動調(diào)整前照燈的前傾角度 , 使其照明范圍保持不變。該系統(tǒng)通 常由前照燈狀態(tài)自動調(diào)整系統(tǒng)、昏暗自動發(fā)光控制系統(tǒng)、前照燈自動變光控制系統(tǒng)和前照燈自動延時關(guān)閉控制系統(tǒng)組合而成。因此對汽車前照燈等電工維修技術(shù)水平的要求將越來越高。前照燈在汽車應(yīng)用方面顯現(xiàn)出舉足輕重的作用，它就是汽車的眼睛，為駕乘人員提供很好的照明效果。 關(guān)鍵詞：前照燈 控制原理 AFS 系統(tǒng)應(yīng)用 1 畢業(yè)設(shè)計（論文）外文摘要 Title： Automatic Headlamp Circuit Analysis and Troubleshooting Abstract： This paper briefly introduces the development process and headlamp technology problems about electrical equipment and automatic headlights role of circuit theory, circuit diagnosis and rule out all kinds of mon faults. In order to ensure night driving safety, improve speed, the current number of vehicles equipped with a headlamp control system. Usually by the state of the system automatically adjusts headlamp system that automatically dim light control system, automatic headlight dimming control system and automatic headlamp control system of a bination of delayed closure. The existing headlight system in the security risks exist, there is growing concern about driving safety issues, so intelligent headlamp system is a wide range of development and application. AFS system described traditional and more advanced previewtype AFS systems theory, control methods and functions, and AFS system development trends are analyzed. This article also describes the current focus on advanced adaptive xenon headlights in the new MercedesBenz 221 cars in the application Keywords ： Headlight Control Principle AFS system application 2 緒論 ................................................................................................................................. 1 第一章 汽車前照燈自動控制系統(tǒng) ..................................................................................... 1 前照燈狀態(tài)自動調(diào)整系統(tǒng) .................................................................................... 1 昏暗自動發(fā)光控制系統(tǒng) ....................................................................................... 2 前照燈自動變光控制系統(tǒng) .................................................................................... 4 前照燈自動延時關(guān)閉控制系統(tǒng) ............................................................................. 4 第二章 AFS 自適應(yīng)前照燈系統(tǒng)簡介 ................................................................................. 5 傳統(tǒng) AFS 系統(tǒng)基本組成及控制 ........................................................................... 6 傳統(tǒng) AFS 系統(tǒng)組成 ................................................................................... 6 AFS 系統(tǒng)的控制方式 ................................................................................. 8 AFS 系統(tǒng)工作情況 .............................................................................................. 8 AFS 系統(tǒng)的軟 硬件 ..................................................................................... 9 第三章 預(yù)瞄型 AFS 系統(tǒng) ............................................................................................... 17 3． 1 PAFS 系統(tǒng)描述 ............................................................................................. 17 3． 2 預(yù)瞄型 AFS 系統(tǒng)功能 .................................................................................... 19 3． 3 AFS 系統(tǒng)未來發(fā)展趨勢 ................................................................................... 20 第四章 汽車前照燈電路故障探析 ................................................................................... 21 故障現(xiàn)象 .......................................................................................................... 21 故障原因 .......................................................................................................... 21 維修注意事項 ................................................................................................... 22 第五章 奔馳 221 車型前照燈故障及其診斷維修 .............................................................. 22 旋轉(zhuǎn)照明開關(guān)部件說明 ..................................................................................... 22 前 SAM 控制單元部件說明 ................................................................................. 23 照明裝置部件說明 ............................................................................................. 24 拆卸安裝氙氣大燈控制單元 .............................................................................. 26 大燈控制功能 ................................................................................................... 27 近光燈促動 .............................................................................................. 27 遠(yuǎn)光燈促動 .............................................................................................. 28 日間行車燈促動 ....................................................................................... 28 自動大燈促動 ........................................................................................... 29 氙氣大燈控制單元部件 說明 .............................................................................. 30 復(fù)式氙氣大燈輸出控制 ............................................................................ 31 近光束 / 遠(yuǎn)光束之間的轉(zhuǎn)換 .................................................................... 31 自動大燈光程調(diào)節(jié) 促動 ............................................................................ 31 動態(tài)轉(zhuǎn)彎照明控制 ................................................................................... 31 促動彎道照明 .......................................................................................... 32 高速功率照明控制 ................................................................................... 32 擴(kuò)展霧燈功能控制 ................................................................................... 32 自適應(yīng)型遠(yuǎn)光燈輔助系統(tǒng)診斷信息 .................................................................... 32 結(jié)論 .....................................