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四(si)輪(lun)(lun)(lun)(lun)驅(qu)(qu)動(dong)(dong)(dong)（4 Wheel Drive)主變(bian)速(su)器(qi)通(tong)過一個輔助變(bian)速(su)器(qi)將動(dong)(dong)(dong)力傳送(song)到前(qian)(qian)輪(lun)(lun)(lun)(lun)和(he)后輪(lun)(lun)(lun)(lun). 輔助變(bian)速(su)器(qi)通(tong)常(chang)有(you)三檔選擇(ze)； 空(kong)檔，四(si)輪(lun)(lun)(lun)(lun)驅(qu)(qu)動(dong)(dong)(dong)，四(si)輪(lun)(lun)(lun)(lun)驅(qu)(qu)動(dong)(dong)(dong)低檔。空(kong)檔時，四(si)輪(lun)(lun)(lun)(lun)驅(qu)(qu)動(dong)(dong)(dong)就變(bian)成(cheng)了兩輪(lun)(lun)(lun)(lun)驅(qu)(qu)動(dong)(dong)(dong)。四(si)輪(lun)(lun)(lun)(lun)驅(qu)(qu) 動(dong)(dong)(dong)適合于(yu)惡劣的路面(mian)駕駛(shi)，例如，雨雪天(tian)和(he)多(duo)沙石路面(mian)。四(si)輪(lun)(lun)(lun)(lun)驅(qu)(qu)動(dong)(dong)(dong)低檔則適合高難度(du)的越野駕駛(shi)。全(quan)輪(lun)(lun)(lun)(lun)驅(qu)(qu)動(dong)(dong)(dong) (All Wheel Drive)全(quan)輪(lun)(lun)(lun)(lun)驅(qu)(qu)動(dong)(dong)(dong)是(shi)四(si)輪(lun)(lun)(lun)(lun)驅(qu)(qu)動(dong)(dong)(dong)的一種. 它自動(dong)(dong)(dong)將發動(dong)(dong)(dong) 機提供的 扭矩分(fen)送(song)到前(qian)(qian)輪(lun)(lun)(lun)(lun)和(he)后輪(lun)(lun)(lun)(lun)，不(bu)(bu)需要(yao)手動(dong)(dong)(dong)去調整，也沒有(you)低檔選擇(ze)。全(quan)輪(lun)(lun)(lun)(lun)驅(qu)(qu)動(dong)(dong)(dong) 減低了車(che)輪(lun)(lun)(lun)(lun)打滑的程度(du)，改善(shan)了駕駛(shi)者的控車(che)能力。全(quan)輪(lun)(lun)(lun)(lun)驅(qu)(qu)動(dong)(dong)(dong)通(tong)常(chang)是(shi)一種 正常(chang)路面(mian)駕駛(shi)系統，并(bing)不(bu)(bu)設計用(yong)于(yu)越野駕駛(shi)。

概述目前，2轎車(che)(che)的(de)4輪(lun)(lun)驅(qu)(qu)(qu)(qu)(qu)動(dong)(dong)(dong)裝置已經(jing)引進(jin)了電子(zi)計算機控制(zhi)系統(tong)，當(dang)前輪(lun)(lun)或后輪(lun)(lun)驅(qu)(qu)(qu)(qu)(qu)動(dong)(dong)(dong)時(shi)(shi)(shi)，車(che)(che)子(zi)隨時(shi)(shi)(shi)根(gen)據路面(mian)狀態(tai)的(de)反饋信息(xi)分配前后輪(lun)(lun)子(zi)的(de)動(dong)(dong)(dong)力(li)，變(bian)為4輪(lun)(lun)驅(qu)(qu)(qu)(qu)(qu)動(dong)(dong)(dong)。4輪(lun)(lun)驅(qu)(qu)(qu)(qu)(qu)動(dong)(dong)(dong)又可以細分成4種驅(qu)(qu)(qu)(qu)(qu)動(dong)(dong)(dong)模(mo)式(shi)：全(quan)時(shi)(shi)(shi)驅(qu)(qu)(qu)(qu)(qu)動(dong)(dong)(dong)（Full－Time）、分時(shi)(shi)(shi)驅(qu)(qu)(qu)(qu)(qu)動(dong)(dong)(dong)（Part-Time）、適時(shi)(shi)(shi)驅(qu)(qu)(qu)(qu)(qu)動(dong)(dong)(dong)（Real－Time）和(he)分時(shi)(shi)(shi)/適時(shi)(shi)(shi)混和(he)驅(qu)(qu)(qu)(qu)(qu)動(dong)(dong)(dong)。全(quan)時(shi)(shi)(shi)驅(qu)(qu)(qu)(qu)(qu)動(dong)(dong)(dong)全(quan)時(shi)(shi)(shi)驅(qu)(qu)(qu)(qu)(qu)動(dong)(dong)(dong)（Full－Time） 全(quan)時(shi)(shi)(shi)驅(qu)(qu)(qu)(qu)(qu)動(dong)(dong)(dong)的(de)特(te)點就(jiu)是(shi)無論怎么(me)樣，永(yong)遠(yuan)都保持四輪(lun)(lun)驅(qu)(qu)(qu)(qu)(qu)動(dong)(dong)(dong)模(mo)式(shi)，這種傳動(dong)(dong)(dong)系統(tong)都是(shi)不(bu)(bu)需要駕駛人選擇操作的(de)。行(xing)駛的(de)時(shi)(shi)(shi)將(jiang)發動(dong)(dong)(dong)機輸出扭矩(ju)按50∶50 設定在前后輪(lun)(lun)上，使前后排車(che)(che)輪(lun)(lun)保持等量的(de)扭矩(ju)，遇到特(te)別路面(mian)的(de)時(shi)(shi)(shi)候就(jiu)可以自動(dong)(dong)(dong)將(jiang)不(bu)(bu)同的(de)扭距分配到各個輪(lun)(lun)子(zi)上面(mian)。全(quan)時(shi)(shi)(shi)驅(qu)(qu)(qu)(qu)(qu)動(dong)(dong)(dong)系統(tong)具有(you)良好(hao)的(de)駕駛操控性和(he)行(xing)駛循跡性，不(bu)(bu)過缺點也是(shi)很明顯的(de)，那就(jiu)是(shi)比較(jiao)廢油，經(jing)濟性不(bu)(bu)夠好(hao)，而(er)且車(che)(che)輛沒有(you)任何裝置來控制(zhi)輪(lun)(lun)胎轉速的(de)差(cha)異，一旦一個輪(lun)(lun)胎離開地面(mian)就(jiu)有(you)可能(neng)讓(rang)你無法前進(jin)。

前輪(lun)驅動(dong)的(de)(de)(de)(de)主要缺(que)點就是(shi)使得(de)汽(qi)(qi)車的(de)(de)(de)(de)操縱性變差。因為大(da)多數的(de)(de)(de)(de)質量(liang)都集中在(zai)汽(qi)(qi)車的(de)(de)(de)(de)前部(bu)，汽(qi)(qi)車的(de)(de)(de)(de)后驅動(dong)輪(lun)圖冊部(bu)將會變得(de)輕(qing)一些，這(zhe)樣后輪(lun)的(de)(de)(de)(de)的(de)(de)(de)(de)附著(zhu)力就會變小(xiao)，在(zai)有冰覆蓋的(de)(de)(de)(de)路面(mian)上(shang)行駛車尾就很(hen)容易發生側滑(hua)。但是(shi)這(zhe)個(ge)問題現在(zai)已經(jing)得(de)到了(le)解決，設(she)計(ji)者在(zai)設(she)計(ji)時會盡可能的(de)(de)(de)(de)將重量(liang)設(she)置在(zai)汽(qi)(qi)車的(de)(de)(de)(de)后部(bu)，理想的(de)(de)(de)(de)質量(liang)分配是(shi)前后輪(lun)所承受的(de)(de)(de)(de)的(de)(de)(de)(de)質量(liang)之比為50:50，但是(shi)前輪(lun)驅動(dong)汽(qi)(qi)車很(hen)少有達(da)到或接近(jin)這(zhe)個(ge)比值的(de)(de)(de)(de)。