BMW xDrive 大比拼
2012年12月24日 星期一
2012年12月21日 星期五
2012年3月20日 星期二
2011年12月17日 星期六
2008年8月16日 星期六
2008年8月8日 星期五
BMW X6 泥濘地測試
2008年6月5日 星期四
BMW xDrive 智慧型可變四輪傳動系統
The BMW all-wheel drive system, xDrive, ensures your BMW has the best possible traction at all times, enhancing agility and keeping you safely on track, even on fast bends.
xDrive is the permanent all-wheel drive system from BMW: under normal circumstances, it distributes driver power between the front and rear axles in a 40:60 ratio, and changes this figure variably when the road surface or overall driving conditions change.
Acting virtually instantaneously and a manner so subtle as to be go virtually unnoticed by the vehicle's occupants, xDrive can direct up to 100% of drive forces to one axle. Enabling the driver to start up effortlessly even on slippery surfaces or steep hills, xDrive routes all power to the axles with the greatest traction. When parking, the system reacts to the need for high manoeuvrability at low speed by opening the clutch completely so the powertrain functions optimally.
At the first sign of understeering, drive power to the front axle is reduced. If oversteering is detected, xDrive directs more power to the front axle. Thanks to this dynamic redistribution of power, vehicle stability returns to normal even before the driver notices anything amiss.
Driving on a winding road or taking a fast bend in dynamic style is particularly enjoyable with xDrive: you feel as if your BMW is being guided along the curve. xDrive ensures that none of drive power is wasted on a loss of traction: every kilowatt of power is effectively brought to bear on the road.
xDrive is regulated by Dynamic Stability Control (DSC) and uses information from the latter system's sensors to monitor road conditions. In addition, brake force courtesy of DSC is used when there is traction difference between the two sides of the vehicle and wheel spin is likely.
2008年6月2日 星期一
xDrive vs. 4Matic vs. Quattro
BMW & Mercedes-Benz & Audi 的4WD 四輪驅動系統大比拼
xDrive vs. 4Matic vs. Quattro
以下表格是三種系統的傳動範圍:
廠牌 BMW Mercedes-Benz Audi
名稱 xDrive 4Matic Quattro
前軸 0~100% 38% 25~75%
後軸 0~100% 62% 25~75%
其中 Mercedes-Benz 的 4Matic 無法變動傳動比例
前軸固定在 38%
後軸固定在 62%
因此~
BMW 的 xDrive 更勝一籌~
相關文章:
BMW xDrive v.s. Audi Quattro
2008年5月22日 星期四
BMW xDrive v.s. Audi Quattro
BMW xDrive v.s. Audi Quattro
兩種四驅系統捉對廝殺
請看影片:
Audi Quattro 四驅系統可以將引擎動力分配在
前、後軸75%~25%之間
也就是說
若前軸分配到引擎動力的75%
則後軸分配到引擎動力的25%
反之
若後軸分配到引擎動力的75%
則前軸分配到引擎動力的25%
故此
Audi Quattro 系統的最大及最小分配率
為75%~25%
而 BMW xDrive 四驅系統的動力分配是
前、後軸100%~0%之間
若前軸分配到引擎動力的100%
則後軸分配到引擎動力的0%
反之
若後軸分配到引擎動力的100%
則前軸分配到引擎動力的0%
所以
BMW xDrive 四驅系統的最大及最小分配率
為100%~0%
誠如影片中所看到的
BMW xDrive 因為將100%引擎動力
都分配到前軸而能輕鬆脫困
而 Audi Quattro 則還需要外力推它兩把方能離開
相關文章:xDrive vs. 4Matic vs. Quattro
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