推荐回答(2个)
越野的话还是大众的4motion似乎要好些。从车型上看大众推出带四轮驱动系统的越野车要早于斯巴鲁,可能在技术储备上要优于斯巴鲁。4motion可以控制前后轴之间的动力分配,幅度是0-100%,而斯巴鲁的VTD似乎做不到,在越野的环境之下四轮之间的受力是不可能平均的,更有可能的是有几个轮是打滑的,所以在这种情况下4motion的有点很突出。而斯巴鲁的VTD似乎更倾向于前后轴动力的均匀分配,这种模式更加有利于操控。也许这样说可能你还不了解,下面有你要的资料,自己看看哈 VTD (Variable Torque Distribution) VTD是Variable Torque Distribution AWD System(可变扭矩分配全时四轮驱动系统)的缩写。斯巴鲁的VTD系统也是与自动变速箱搭配的全轮驱动系统,但与同样搭配自动变速器的MPT系统不同的是,它采用的是一套复合行星齿轮中央差速器,所以基本的前后轮扭矩分配是前后轮45:55,该系统还装有限滑后差速器LSD,保证了光滑路面起步的稳定和行驶稳定性。VTD系统可以根据电脑监测车速、轮速、节气门开度、自动变速箱挡位等数据,通过调节多片式离合器油压,实现实时调整前后轮扭矩分配。在湿滑路面行驶时,电脑甚至可以锁止中央差速器达到稳定的前后轮50: 50扭矩分配,以求优秀的操控表现。 一般状况下,4motion系统将驱动力按照前后50:50的形式分配给前后桥,而在必要的时候依靠4motion系统把驱动力100%的是附加到某个车轮上面,即使三个车轮全部处于打滑状态,理论上途锐或者卡宴都可以从容的走出困境。由于扭矩的输出可以通过差速器里面离合器碟片来设置,所以4motion可以控制分配到前轴和后轴的动力比例。理论上来说,它可以将输出到某一个轴的动力控制为从0到100%,又或者50:50的动力比例输出。而司机基本上无法觉察它的工作。当车辆行驶在市区的正常路面时,前后轴转速基本一致时,电脑会把90%的动力输出到前轮,只留下10%给后轴。司机在整个行车过程唯一可能留意到的就是带有4motion系统的大众车在不管什么路面状况下都能表现自如,没有任何突兀感。快速起步加速时,4motion恒时全轮驱动系统将调整为最佳输出模式,以发挥最强的抓地力。一旦进入正常行驶状况,驱动轮不再有空转的威胁时,系统便又回复到正常的设定模式。Phaeton只要还有一个轮胎有抓地力,车辆就可以稳稳的向前行进,这样的驾驶安全性,绝非一般传统的后轮驱动可及。新一代4motion实时四驱比起1998年的第一代产品已经先进很多。先进的电子控指令系统反应速度更快更稳定,同时更换系统机油的时间也从以前的3000公里变成6000公里。还有,电子差速器直接放在后轴上,减少了系统体积,更为紧凑。包括帕萨特在内的一些大众房车都有运用4motion的例子。毫无疑问,我们都知道四驱车在泥泞湿滑路面上面的表现绝对的好过一般的两轮驱动车辆,现在即便在干燥路面上,日愈成熟的实时四驱车已经逐渐在行车性能、操控性上都开始挑战起其他前驱和后驱车辆,并且它在转弯时的稳定性和较高的主动安全性而获得厂家和顾客的青睐。
斯巴鲁左右对称全时四轮驱动系统的优势在湿滑路面上表现得更为彻底,因为有一个中样变速箱实时分配扭矩,四轮的扭矩始终是平衡的,这样就不会因为路面湿滑、不平整,导致某个轮子空转,行车抓地力和平衡性要好很多。
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