t*****0
发帖数: 264 | 1 ☆─────────────────────────────────────☆
fjcruiser (FJ) 于 (Fri Jan 21 01:47:10 2011, 美东) 提到:
四驱是一个很复杂的概念，广大不明真相的群众很容易看一些无良厂商制作的
youtube录像受骗上当。一个四驱车到底怎么样，*至少*要从以下八个方面看：
公路驾驶指标(AWD)
AWD类型: 适时(on-demand) / 全时 (full-time)
中差: 无/ 开放 / 限滑
后差: 开放 / 限滑 / 其它(SH-AWD)
前差: 开放 / 限滑
越野驾驶指标(4WD, 4x4)
低速档: 无/有
中差锁(分动箱锁): 无/有
后差锁: 无/有
前差锁: 无/有
下面，我们以一些本版常讨论的车型为例，分析一下这些四驱车到底都是什么货。
（待续）
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fjcruiser (FJ) 于 (Fri Jan 21 01:57:46 2011, 美东) 提到:
四驱系统案例：Grand Cherokee 2011 LIMITED/OVERLAND (Quadra Drive II)
公路驾驶指标(AWD)
AWD类型: 全时 (full-time)
中差: 电控LSD
后差: 电控LSD
前差: 电控LSD
评论：GC全时四驱很强大，防滑功能很全面，除了反应速度可能稍逊Torsen LSD，没别
的缺点了。
越野驾驶指标(4WD, 4x4)
低速档: 有
中差锁: LSD离合器100%锁止
后差锁: LSD离合器100%锁止
前差锁: LSD离合器100%锁止
评论：靠LSD离合器锁止貌似不是很可靠耐用，不过这车本来也不是玩极限越野的，偶
尔过个泥坑爬个小坡没问题。
总结：GC的全时四驱货真价实，毫无疑问
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fjcruiser (FJ) 于 (Fri Jan 21 02:05:29 2011, 美东) 提到:
四驱系统案例：Subaru Forester 2011 (自动档)
公路驾驶指标(AWD)
AWD类型: 适时(90% FWD)
中差: 无
后差: 开放
前差: 开放
评论：虽然车便宜，却是假四驱的主要代表，真要全时四驱subaru还得看tribeca
越野驾驶指标(4WD, 4x4)
低速档: 无
中差锁: 无
后差锁: 无
前差锁: 无
评论：没有越野功能
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rockytodd (Rocky Mountain) 于 (Fri Jan 21 02:41:57 2011, 美东) 提到:
Forester 自动档不是前60后40吗
手动挡50/50
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hithere2008 (lostinamerica) 于 (Fri Jan 21 02:43:46 2011, 美东) 提到:
i thought on-demand AWD performs better than full time AWD, especially RWD
based ones, like BMW, infiniti, Benz.
Yes center differential and LSD is a must to have.
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clnn (nan) 于 (Fri Jan 21 02:45:11 2011, 美东) 提到:
继续啊, 这个应该M吧
如果再介绍一点各个名词的基本概念就更好了,
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fjcruiser (FJ) 于 (Fri Jan 21 02:57:36 2011, 美东) 提到:
车型：HONDA CRV
公路驾驶指标(AWD)
AWD类型: 99.99999% FWD, 跟没有一样
中差: 无
后差: 开放
前差: 开放
评论：虽然CRV也算适时AWD，但是CRV用液压泵驱动离合器片的AWD性能很差，
后轮只有在前轮疯狂打滑的时候才能得到一定动力，比subaru用电控离合器
实现的适时四驱要差不少。如果非要给一个名词，就叫零时四驱好了。
越野驾驶指标(4WD, 4x4)
低速档: 无
中差锁: 无
后差锁: 无
前差锁: 无
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fjcruiser (FJ) 于 (Fri Jan 21 03:08:22 2011, 美东) 提到:
四驱系统案例：Subaru Forester 2011 (手动档)
公路驾驶指标(AWD)
AWD类型: 全时 (full-time)
中差: 粘性限滑(VLSD)
后差: 开放
前差: 开放
评论：几乎最廉价的真全时四驱，限滑性能比较差(VLSD反应速度很慢，效果也有限)
，但毕竟是四条腿一块爬的，发力均匀，开在路上本身就不容易开始打滑。当然，
你得会开手动才玩得转。
(如果玩手动subaru，可以考虑WRX，在全时四驱的基础上有更好的限滑装置。)
越野驾驶指标(4WD, 4x4)
低速档: 无
中差锁: 无
后差锁: 无
前差锁: 无
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fjcruiser (FJ) 于 (Fri Jan 21 03:28:04 2011, 美东) 提到:
四驱系统案例：Jeep Rubicon 2010
公路驾驶指标(AWD)
AWD类型: 无
中差: 无
后差: 开放
前差: 开放
越野驾驶指标(4WD, 4x4)
低速档: 有
中央分动器：机械锁止
后差锁：机械锁止
前差锁: 机械锁止
评论：爬石头越野的硬汉终极选择，但是这是纯粹的分时四驱，
在公路上只能当后驱车开.
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clnn (nan) 于 (Fri Jan 21 03:58:23 2011, 美东) 提到:
能不能分析一下途锐
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fjcruiser (FJ) 于 (Fri Jan 21 04:26:10 2011, 美东) 提到:
Tuoareg 最近好像变动不小，低速挡没了，差速锁也不知道有没有，又据说有LSD后差
速器，还有用torsen LSD的hybrid，总之一塌糊涂，靠网上的资料很难弄清楚，简单说
就是tuoareg要变成纯公路车，不越野了
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wefwef (联想之父-The Legend Dad) 于 (Fri Jan 21 04:42:37 2011, 美东) 提到:
妈的，这种好帖子一定要顶一个。有的厂商的广告太无良！
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clnn (nan) 于 (Fri Jan 21 04:43:35 2011, 美东) 提到:
能不能给启蒙一下,这些技术都是什么意思,哪儿有这些资料吗?
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fjcruiser (FJ) 于 (Fri Jan 21 05:02:27 2011, 美东) 提到:
四驱系统案例: Audi Q7 2010
公路驾驶指标(AWD)
AWD类型: 全时(full-time, 前后40:60分配扭矩)
中差: Torsen-C
后差: 开放，电脑刹车限滑
前差: 开放，电脑刹车限滑
总结：最好的AWD系统之一，使用torsen差速器，限滑反应速度最快，而且torsen-C
的前后扭矩分配可以提供更接近后驱车的操控感。电脑刹车限滑也省了前后LSD，
简单实用。有趣的是：虽然Audi自己打着quattro的牌子搞了很多四驱系统，Q7用的
却是borgwarner的系统。
越野驾驶指标(4WD, 4x4)
低速档: 无
中差锁：似乎可锁定?
后差锁：无
前差锁: 无
总结：你真的会开着5万刀的Q7越野么
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kz80 (雨过天晴) 于 (Fri Jan 21 06:23:01 2011, 美东) 提到:
这贴不错， 教育贴
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photons (photon) 于 (Fri Jan 21 10:01:35 2011, 美东) 提到:
How about Ford escape 4wd 2010 or 2011? Thanks.
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geforcemx (老虎油) 于 (Fri Jan 21 10:08:06 2011, 美东) 提到:
无语了.
看看2008版本的forester
http://www.distrocars.com/2008-subaru-forester
The Forester line features three versions of Symmetrical All-Wheel
Drive, all of which power all four wheels all the time and can transfer
more power to the wheels with the best grip. In all models equipped with
the 5-speed manual transmission, a viscous coupling locking center
differential built into the transmission case divides engine power
50:50. Wheel slippage at one set of wheels causes more power to shift to
the opposite set, ensuring that the wheels with the best traction
receive more power.
In Forester models equipped with the 4-speed electronic direct control
automatic transmission (except Sports 2.5 XT), an electronically managed
continuously variable transfer clutch actively manages power
distribution based on acceleration, deceleration and available traction.
All-Wheel Drive control logic enhances stability by monitoring
individual wheel speeds and reacting quickly to wheel slippage. The
control logic helps to improve tight corner braking, contributing to
neutral handling response (reduced understeer and oversteer). At
cruising speeds, under light throttle, the system optimizes power
distribution to enhance fuel efficiency.
The Forester Sports 2.5 XT with the optional 4-speed direct control
automatic transmission uses the Variable Torque Distribution (VTD)
version of Symmetrical All-Wheel Drive. The VTD automatic transmission
uses a planetary gear-type center differential that splits the power
45:55, with the rear-wheel bias enhancing handling agility and the
performance driving feel.
2011版的
http://www.carguideweb.com/articles/9527/
The 2011 Forester features two versions of Symmetrical full-time All-
Wheel Drive, which make all-wheel drive traction available all the time,
regardless of speed, gear, or conditions. Models equipped with the 5-
speed manual transmission use a viscous-coupling locking centre
differential that distributes power 50/50, for well-balanced handling at
all speeds.
In all Forester models with the automatic transmission, an
electronically-controlled multi-plate transfer clutch system actively
manages power distribution based on acceleration, deceleration, and
available traction. This system distributes power 60/40 front/rear under
normal conditions, but balances power 50/50 for maximum grip when
slippage is detected. Control logic in this AWD system enhances
stability by monitoring individual wheel speeds and reacting more
quickly to wheel slippage. The control logic also helps to improve tight
corner braking, contributing to more neutral handling response (reduced
understeer and oversteer).
看看2万刀预算能买什么样的四驱，大切么？还是WRX STI? 还是audi quattro?
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loveast (loveast.soon) 于 (Fri Jan 21 10:28:27 2011, 美东) 提到:
继续阿！很不错，分析一下 tribeca FjCruiser.
在哪儿查到这些详细指标的?
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marylander (Hyperdunk) 于 (Fri Jan 21 11:11:51 2011, 美东) 提到:
顶，要是能有所有AWD车型的对照表就好了
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bearJhonson (八棵七七葚) 于 (Fri Jan 21 11:44:06 2011, 美东) 提到:
since toyota bought subaru, forester slided into more rav-4 like, hehe
无语了.
看看2008版本的forester
http://www.distrocars.com/2008-subaru-forester
The Forester line features three versions of Symmetrical All-Wheel
Drive, all of which power all four wheels all the time and can transfer
more power to the wheels with the best grip. In all models equipped with
the 5-speed manual transmission, a viscous coupling locking center
differential built into the transmission case divides engine power
50:50. Wheel slippage at one set of wheels causes more power to shift to
the opposite set, ensuring that the wheels with the best traction
receive more power.
In Forester models equipped with the 4-speed electronic direct control
automatic transmission (except Sports 2.5 XT), an electronically managed
continuously variable transfer clutch actively manages power
distribution based on acceleration, deceleration and available traction.
All-Wheel Drive control logic enhances stability by monitoring
individual wheel speeds and reacting quickly to wheel slippage. The
control logic helps to improve tight corner braking, contributing to
neutral handling response (reduced understeer and oversteer). At
cruising speeds, under light throttle, the system optimizes power
distribution to enhance fuel efficiency.
The Forester Sports 2.5 XT with the optional 4-speed direct control
automatic transmission uses the Variable Torque Distribution (VTD)
version of Symmetrical All-Wheel Drive. The VTD automatic transmission
uses a planetary gear-type center differential that splits the power
45:55, with the rear-wheel bias enhancing handling agility and the
performance driving feel.
2011版的
http://www.carguideweb.com/articles/9527/
The 2011 Forester features two versions of Symmetrical full-time All-
Wheel Drive, which make all-wheel drive traction available all the time,
regardless of speed, gear, or conditions. Models equipped with the 5-
speed manual transmission use a viscous-coupling locking centre
differential that distributes power 50/50, for well-balanced handling at
all speeds.
In all Forester models with the automatic transmission, an
electronically-controlled multi-plate transfer clutch system actively
manages power distribution based on acceleration, deceleration, and
available traction. This system distributes power 60/40 front/rear under
normal conditions, but balances power 50/50 for maximum grip when
slippage is detected. Control logic in this AWD system enhances
stability by monitoring individual wheel speeds and reacting more
quickly to wheel slippage. The control logic also helps to improve tight
corner braking, contributing to more neutral handling response (reduced
understeer and oversteer).
看看2万刀预算能买什么样的四驱，大切么？还是WRX STI? 还是audi quattro?
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fjcruiser (FJ) 于 (Fri Jan 21 11:45:52 2011, 美东) 提到:
很遗憾 大多无良厂商不会直接告诉你这些具体细节 不然大多数伪四驱都没法卖了 只
能自己google做research 或者自己买来研究
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geforcemx (老虎油) 于 (Fri Jan 21 11:47:15 2011, 美东) 提到:
yes, it is. And now Subaru is a little bit "滥大街"
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fjcruiser (FJ) 于 (Fri Jan 21 11:47:31 2011, 美东) 提到:
第一个是真四驱
2011的是假四驱 不要被无良网站欺骗 subaru自己的cars101都不敢这么吹牛
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dynkin (德罗伊德) 于 (Fri Jan 21 11:49:02 2011, 美东) 提到:
forester和outback的awd一样不一样呢？
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geforcemx (老虎油) 于 (Fri Jan 21 11:52:24 2011, 美东) 提到:
2011版本，的确有人支持你的说法，不过可以通过手动模式，来获得50/50分配
http://www.subaruforester.org/vbulletin/f81/power-distribution-
forester-4eat-87269/
Under good traction conditions it's 90/10 F/R unless you lock the
transmission in manual mode into 1st or 2nd gear then it's 50/50 split.
Under bad traction conditions it can send almost 100% to the rear. Also,
as an adjunct to the transmission the traction control can brake the
wheels independently to prevent torque loss due to wheel spin. So in
theory all the torque could be fed to just one wheel, either front or
back.
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fjcruiser (FJ) 于 (Fri Jan 21 11:55:47 2011, 美东) 提到:
几十几十不重要 最根本的东西在于没有中央差速器 这就决定了它正常行驶状态不可能
稳定保持90/10以外的扭矩分配
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dannyfulgent (小丹尼) 于 (Fri Jan 21 12:20:30 2011, 美东) 提到:
好贴要顶
subaru堕落了，唉...
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dynkin (德罗伊德) 于 (Fri Jan 21 12:24:53 2011, 美东) 提到:
意思就是开始偷工减料了？
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NYPD (New York, Pursuit of Dream) 于 (Fri Jan 21 12:31:47 2011, 美东) 提到:
好帖子顶！ 看过4runner，X5， GL450么？新出的Land Cruiser 570如何？
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Ktar (Kta) 于 (Fri Jan 21 12:44:04 2011, 美东) 提到:
EVO STI的四驱如何？
还有奥迪 Quattro呢？
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geforcemx (老虎油) 于 (Fri Jan 21 12:44:33 2011, 美东) 提到:
不知道这个官方信息是否已经是过时的
http://www.subaru.ca/WebPage.aspx?Ar...&WebSiteID=282
Subaru Active All-Wheel Drive varies the power split according to driving
conditions. Under most conditions, 60 per cent of the engine torque is
transferred to the front wheels and 40 per cent to the rear; this is to
match the vehicle’s weight distribution.
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geforcemx (老虎油) 于 (Fri Jan 21 12:45:31 2011, 美东) 提到:
09之后丰田入主就开始了
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geforcemx (老虎油) 于 (Fri Jan 21 12:47:32 2011, 美东) 提到:
原来4AT和5AT的动力分配不一样，5AT的好
现在换CVT了，不知道还是不是outback好了，不过应该是
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toddf70 (foxy) 于 (Fri Jan 21 13:11:16 2011, 美东) 提到:
强低成本，表面上降价，实际上偷工减料。
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toddf70 (foxy) 于 (Fri Jan 21 13:19:39 2011, 美东) 提到:
re【 在 fjcruiser (FJ) 的大作中提到: 】 |
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