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概述目前(qian)(qian)，2轎車的(de)(de)(de)4輪(lun)驅(qu)(qu)(qu)動(dong)(dong)(dong)(dong)裝置(zhi)已經(jing)(jing)引進了電子計算機控制系統(tong)，當前(qian)(qian)輪(lun)或后輪(lun)驅(qu)(qu)(qu)動(dong)(dong)(dong)(dong)時(shi)(shi)，車子隨時(shi)(shi)根據(ju)路(lu)面狀態(tai)的(de)(de)(de)反饋信(xin)息(xi)分(fen)配前(qian)(qian)后輪(lun)子的(de)(de)(de)動(dong)(dong)(dong)(dong)力，變為(wei)4輪(lun)驅(qu)(qu)(qu)動(dong)(dong)(dong)(dong)。4輪(lun)驅(qu)(qu)(qu)動(dong)(dong)(dong)(dong)又可以細分(fen)成4種驅(qu)(qu)(qu)動(dong)(dong)(dong)(dong)模(mo)式(shi)：全(quan)(quan)(quan)時(shi)(shi)驅(qu)(qu)(qu)動(dong)(dong)(dong)(dong)（Full－Time）、分(fen)時(shi)(shi)驅(qu)(qu)(qu)動(dong)(dong)(dong)(dong)（Part-Time）、適(shi)時(shi)(shi)驅(qu)(qu)(qu)動(dong)(dong)(dong)(dong)（Real－Time）和(he)分(fen)時(shi)(shi)/適(shi)時(shi)(shi)混(hun)和(he)驅(qu)(qu)(qu)動(dong)(dong)(dong)(dong)。全(quan)(quan)(quan)時(shi)(shi)驅(qu)(qu)(qu)動(dong)(dong)(dong)(dong)全(quan)(quan)(quan)時(shi)(shi)驅(qu)(qu)(qu)動(dong)(dong)(dong)(dong)（Full－Time） 全(quan)(quan)(quan)時(shi)(shi)驅(qu)(qu)(qu)動(dong)(dong)(dong)(dong)的(de)(de)(de)特點就是無論(lun)怎(zen)么樣(yang)，永(yong)遠都保持(chi)四輪(lun)驅(qu)(qu)(qu)動(dong)(dong)(dong)(dong)模(mo)式(shi)，這種傳動(dong)(dong)(dong)(dong)系統(tong)都是不(bu)需要駕駛人(ren)選擇操作的(de)(de)(de)。行駛的(de)(de)(de)時(shi)(shi)將(jiang)發動(dong)(dong)(dong)(dong)機輸出扭矩(ju)按50∶50 設定(ding)在前(qian)(qian)后輪(lun)上，使前(qian)(qian)后排車輪(lun)保持(chi)等(deng)量的(de)(de)(de)扭矩(ju)，遇到(dao)特別路(lu)面的(de)(de)(de)時(shi)(shi)候就可以自動(dong)(dong)(dong)(dong)將(jiang)不(bu)同(tong)的(de)(de)(de)扭距分(fen)配到(dao)各(ge)個輪(lun)子上面。全(quan)(quan)(quan)時(shi)(shi)驅(qu)(qu)(qu)動(dong)(dong)(dong)(dong)系統(tong)具有良(liang)好(hao)的(de)(de)(de)駕駛操控性(xing)和(he)行駛循跡(ji)性(xing)，不(bu)過缺點也(ye)是很(hen)明顯的(de)(de)(de)，那就是比(bi)較廢油，經(jing)(jing)濟(ji)性(xing)不(bu)夠好(hao)，而(er)且車輛沒有任何裝置(zhi)來控制輪(lun)胎轉速的(de)(de)(de)差(cha)異，一旦(dan)一個輪(lun)胎離開(kai)地面就有可能讓你無法前(qian)(qian)進。

分動(dong)(dong)器的(de)(de)功(gong)能是(shi)執(zhi)行(xing)(xing)前后輪扭矩分配功(gong)能，在分動(dong)(dong)器中間布置一個濕式多片離合器，該離合器右端(duan)(duan)通過傳動(dong)(dong)軸(zhou)驅(qu)動(dong)(dong)后輪，左(zuo)端(duan)(duan)通過鏈傳動(dong)(dong)驅(qu)動(dong)(dong)前輪。電(dian)(dian)控(kong)單元(yuan)（ECU)ECU是(shi)AWD系統(tong)的(de)(de)核心(xin)，其功(gong)用是(shi)根(gen)據制定的(de)(de)控(kong)制方案(an)，按照編制的(de)(de)程序對(dui)各種(zhong)傳感(gan)器輸(shu)入信號(hao)(hao)進行(xing)(xing)分析、計(ji)算、處理(li)(li)，輸(shu)出一定的(de)(de)控(kong)制信號(hao)(hao)指(zhi)令(ling)，驅(qu)動(dong)(dong)電(dian)(dian)磁閥動(dong)(dong)作。AWD系統(tong)ECU主(zhu)要由輸(shu)入信號(hao)(hao)調(diao)理(li)(li)電(dian)(dian)路、微處理(li)(li)器、輸(shu)出信號(hao)(hao)處理(li)(li)電(dian)(dian)路、電(dian)(dian)源電(dian)(dian)路等(deng)硬件(jian)部(bu)分以及控(kong)制系統(tong)和控(kong)制程序、軟件(jian)平(ping)臺等(deng)軟件(jian)部(bu)分組成。為保證控(kong)制系統(tong)可靠地工作，電(dian)(dian)控(kong)單元(yuan)還必須采取(qu)有效的(de)(de)抗干擾措施和故障自(zi)診(zhen)斷處理(li)(li)措施。

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四輪一帶生產(chan)(chan)商(shang)或者經銷商(shang)，不管(guan)是(shi)高中低檔(dang)，隨著時(shi)間(jian)累積都會找(zhao)到自己的(de)(de)(de)層(ceng)次定位，市場有個潛在(zai)(zai)(zai)的(de)(de)(de)規則讓(rang)低端(duan)產(chan)(chan)品(pin)找(zhao)到低端(duan)客戶(hu)，中端(duan)產(chan)(chan)品(pin)找(zhao)到中端(duan)用(yong)(yong)戶(hu)，高l端(duan)產(chan)(chan)品(pin)找(zhao)到高等(deng)用(yong)(yong)戶(hu)，三層(ceng)的(de)(de)(de)界限(xian)也難擾亂！各種(zhong)層(ceng)次產(chan)(chan)品(pin)的(de)(de)(de)存在(zai)(zai)(zai)是(shi)取(qu)決于市場的(de)(de)(de)需求，應該在(zai)(zai)(zai)很長一段時(shi)間(jian)內(nei)，這個現象還(huan)會存在(zai)(zai)(zai)，等(deng)待人們(men)消費觀念的(de)(de)(de)轉變,行(xing)業的(de)(de)(de)逐步規范，由(you)市場來慢慢轉變!四輪一帶

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