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Jacobliu wrote:
大大說的沒錯!a3 ...(恕刪)
不是吧
A3/S3的Quattro是屬於Haldex
前輪抓地力不足 才把動力傳到後輪
大部分時間都是前驅
並不是real-time
和RS4 S5 A4 A5 Quattro Torsen不同
http://icar.yam.com/article/mkarticle.php?article=20070921000153
Naricissistic, my god I love it
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為了我的S3，曾經問過Haldex，因為我的問題包括一些LSD以及ESP搭配的問題，所以Haldex回覆也不少，僅僅節錄跟前述討論有關的部份。
回覆者署名Ulf Herlin，是Haldex的VP
簡單來說，S3 Haldex能把力量100%全部傳輸到後輪去，平時可以40~45%傳至後輪，如果加速的話，會傳輸60~70%至後輪，至於怎麼分配0~100的比例，跟車子動態，重心變化，都有關聯。
1. There are situations where near 100% torque transfer to the rear axle occur. An example is if the front wheels are on ice and the rear wheels are on tarmac. In that case the front wheels have (almost) no grip. In that case, the haldex coupling will transfer all torque to the rear axle and prevent front wheel spin. On uniform surfaces however, the coupling can not
transfer all torque to the rear axle. See below.
2. We need slip over the coupling in order to be able to transfer torque.That slip (rotational speed difference between the front and rear axle) is created by different tyre rolling radius (front to rear) and drive slip between the tyre and road. The rolling raduis difference can be created by differently worn tyres (or different dimensions, something that should be avoided) and different load. In most cars, the front axle has a greater load than the rear axle, which causes the roll radius of the front tire to be smaller than the one for the rear tyres (given the same nominal size). This gives us the possibility to transfer torque to the rear axle also when no slip occurrs on the front tyres.
During cruising which a constant velocity, we have the possibility to transfer up to 40-45% of the torque to the rear axle, given nominal tyres. During acceleration, the weight transfer increase the front tyre slip and decreases the rear axle slip, giving us the possibility to achieve more or less the same torque distribution as the dynamic weight distribution.
Generally speaking, depending on the vehicle somewhere around 60-70% is possible to achieve during a full acceleration. Note that we are still talking about a uniform surface, with no spin on the front wheels.
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Dopefish wrote:
別太相信國內媒體拉車...(恕刪)
可以看看這裡
Haldex和Torsen的差別
Haldex都是有條件的狀況下 才把動力傳到後輪
http://web.wenxuecity.com/BBSView.php?SubID=auto_best&MsgID=5239&c_lang=big5
http://www.mobile01.com/print.php?f=286&t=346167&p=8
http://www.carnews.com/detail/2007-1/25/article_view_6116.htm
http://www.ck101.com/forums/redirect.php?tid=1126578&goto=lastpost
Naricissistic, my god I love it
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