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SAE (Society of Automotive Engineers)，汽車工程師學(xué)會(huì)對(duì)于汽車的四驅(qū)系統(tǒng)（準(zhǔn)確講應(yīng)該是多輪驅(qū)動(dòng)系統(tǒng)）的分類是有它的一套推薦的做法的，先放一張圖： ?  下面是維基百科中 SAE 關(guān)于四驅(qū)系統(tǒng)分類的說明： Per the SAE International standard J1952, AWD is the preferred term for all the systems described above. The standard subdivides AWD systems into three categories. 根據(jù) SAE J1952 標(biāo)準(zhǔn)，AWD 是對(duì)下面描述的所有四驅(qū)系統(tǒng)的推薦術(shù)語。該標(biāo)準(zhǔn)將 AWD 系統(tǒng)細(xì)分為三類。 Part-Time AWD systems require driver intervention to couple and decouple the secondary axle from the primarily driven axle and these systems do not have a center differential (or similar device). The definition notes that part-time systems may have a low range. 分時(shí)四驅(qū)系統(tǒng)需要駕駛員介入來接通和斷開第二驅(qū)動(dòng)軸和主驅(qū)動(dòng)軸的連接，并且這些系統(tǒng)沒有中央差速器（或者類似的裝置）。該定義指出分時(shí)系統(tǒng)可能有低速檔。 Full-Time AWD systems drive both front and rear axles at all times via a center (inter-axle) differential. The torque split of that differential may be fixed or variable depending on the type of center differential. This system can be used on any surface at any speed. The definition does not address inclusion or exclusion of a low range gear. 全時(shí)四驅(qū)系統(tǒng)通過中央差速器同時(shí)驅(qū)動(dòng)前軸和后軸。根據(jù)中央差速器的不同類型，扭矩分配可能是固定的也可能是可變的。全時(shí)四驅(qū)系統(tǒng)可以在任何路面任何速度下使用。該定義沒有規(guī)定需要包含或者不包含低速檔。 On-Demand AWD systems drive the secondary axle via an active or passive coupling device or 'by an independently powered drive system'. The standard notes that in some cases the secondary drive system may also provide the primary vehicle propulsion. An example is a hybrid AWD vehicle where the primary axle is driven by an internal combustion engine and secondary axle is driven by an electric motor. When the internal combustion engine is shut off the secondary, electrically driven axle is the only driven axle. On-demand systems function primarily with only one powered axle until torque is required by the second axle. At that point either a passive or active coupling sends torque to the secondary axle. 適時(shí)四驅(qū)系統(tǒng)通過一個(gè)主動(dòng)或者被動(dòng)的耦合裝置來驅(qū)動(dòng)第二驅(qū)動(dòng)軸，或者用一套獨(dú)立的動(dòng)力系統(tǒng)來驅(qū)動(dòng)第二驅(qū)動(dòng)軸。標(biāo)準(zhǔn)指出在某些情況下第二驅(qū)動(dòng)軸也會(huì)承擔(dān)起驅(qū)動(dòng)車輛的主要角色。一個(gè)例子就是混合動(dòng)力 AWD 汽車，它的主驅(qū)動(dòng)軸是由內(nèi)燃機(jī)驅(qū)動(dòng)的，第二驅(qū)動(dòng)軸是又電機(jī)驅(qū)動(dòng)的，當(dāng)內(nèi)燃機(jī)停機(jī)時(shí)，由電機(jī)驅(qū)動(dòng)的第二驅(qū)動(dòng)軸就成了車輛的唯一驅(qū)動(dòng)軸。適時(shí)四驅(qū)系統(tǒng)主要是由主驅(qū)動(dòng)軸來提供動(dòng)力，直到第二驅(qū)動(dòng)軸也需要扭矩，此時(shí)再主動(dòng)或者被動(dòng)的將扭矩分配給第二驅(qū)動(dòng)軸。 In addition to the above primary classifications the J1952 standard notes secondary classifications resulting in a total of eight system designations: 除上述主要分類外，J1952 標(biāo)準(zhǔn)還注明了二級(jí)分類，總共有八個(gè)子類：
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