b*******l
发帖数: 1095 | 1 太公在美国读过书, 他知道美国写文章需要在开头有个总结, 写出条件,摆出结论..
然后面就详细列出分析过程并提供依据...
--------------------------------------------------
我的2010 卡罗拉, 不打滑..
原因很简单, 在30英里时速以上, Traction Control 会强行介入,想关都关不掉...
我试过高速进弯, 大约50进25的Ramp, 走外线----急刹----急弯----紧贴内线-----直
出的 操作 在这个Traction Control 介入后,过弯是不会飘移的..不 能 漂 移!!!!
因为这个 Traction Control 车会在侧飘前会自动走直 而且 Traction Control 会
Beep---Beep的叫, 直到寻回Traction为止.
我试过在雨天进ramp, 过弯过程我觉得速度太快, 感觉要甩出去, 我急刹车, 同样的情
况出现了: raction Control 会Beep---Beep的叫, 直到寻回Traction为止,车身会左右
明显的摇晃一下, 然后车子就跑直了(不横漂... 阅读全帖 |
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d*******3
发帖数: 6550 | 2 不对，雨雪天traction比stability更加重要，DSC只要某个轮胎有一点打滑就会对那个
轮胎brake, 雨雪天反而会造成轮胎失去traction. DTC则允许轮胎有一定的打滑来保持
整体的traction
下面官网的解释
“When the drive wheels start losing traction the DSC automatically begins
stabilisation measures. The Dynamic Stability Control system curbs the
engine output and stops slip on the wheels. In exceptional situations,
however, a small amount of wheel slip can be an advantage.
When driving in deep snow, slush or on loose terrain a small amount of wheel
spin improves traction. For th... 阅读全帖 |
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T******g
发帖数: 21328 | 3 LSD:
Quote:
Originally Posted by me
A few points because I think others have confused a few issues here.
The Torsen I used in 94 and I think some 95s is the original worm gear
design that every one loved. The Torsen II used in I think later 95 through
basically now (the later used a dif with a different name but it was the
same basic design) is a Quaife type helix LSD. The torque sensing name came
from the Torsen I dif which developed locking based on the torque applied to
the wheels, not based ... 阅读全帖 |
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d***a
发帖数: 13752 | 4
这是谁说的啊？Tractional control和Stability control
最开始是在RWD的车用的吧，和四驱没有关系啊。
Stability control是建在ABS和traction control之上的。
早几年四驱的SUV比sedan更普及地用stability control，
是因为SUV的stability不好，更需要stability control。
并且当时的stability control价格高，在相对较贵的SUV
里用，更容易被用户接受。后来stability control的价格
降下来了，在sedan里也用得多了。
四驱当然有好处。但原文说雪胎比AWD在雪中更用效，
并没有错，特别是在有traction control或stability control
的情况下。FWD和RWD的车在加速容易打滑，因为只有两个
轮子驱动。但traction control能检测到打滑，减少驱动。
traction control很有效，这样的话，在控制打滑上，四驱
对两驱的优势就大大减小了。这是有测试结果证明的。 |
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g*******x
发帖数: 2158 | 5 再加点
2009 Forester technical descriptions from a March 2008 Subaru Canada
document （http://www.subaru.ca/webpage.aspx?articleid=4606&webpageid=4998&websiteid=282）
AWD, Transmission, and F/R Torque Split
Quote:
Forester uses two different versions of Symmetrical AWD, both with Subaru's
standard Vehicle Dynamics Control electronic stability system.
Models equipped with the 5-speed manual transmission use a locking viscous-
coupling locking centre differential that distributes power 50/50, for well-... 阅读全帖 |
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b*********n
发帖数: 2975 | 6 all auto shift with on-demand awd, period
再加点
2009 Forester technical descriptions from a March 2008 Subaru Canada
document （http://www.subaru.ca/webpage.aspx?articleid=4606&webpageid=4998&websiteid=282）
AWD, Transmission, and F/R Torque Split
Quote:
Forester uses two different versions of Symmetrical AWD, both with Subaru's
standard Vehicle Dynamics Control electronic stability system.
Models equipped with the 5-speed manual transmission use a locking viscous-
coupling locking centre different... 阅读全帖 |
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y*****2
发帖数: 223 | 7 请问tirerack上给的各种数据比如说
Hydroplaning Resistance
Wet Traction
Cornering Stability
Dry Traction
Steering Response
Light Snow Traction
Deep Snow Traction
Ice Traction
之类的，准确不？如果准确的话，可以看到Yokohama明显比goodyear好太多了，但是
yokohama又便宜不少，莫非这世上还真有既物美又价廉的轮胎吗？ |
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y*****2
发帖数: 223 | 8 请问tirerack上给的各种数据比如说
Hydroplaning Resistance
Wet Traction
Cornering Stability
Dry Traction
Steering Response
Light Snow Traction
Deep Snow Traction
Ice Traction
之类的，准确不？如果准确的话，可以看到Yokohama明显比goodyear好太多了，但是
yokohama又便宜不少，莫非这世上还真有既物美又价廉的轮胎吗？ |
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c********e
发帖数: 887 | 9 wet traction, dry traction, snow traction, steering, corner response你以为只
有耐磨？wet traction和耐磨是对立的，wet snow traction和花纹有关，我建议你学
习一下吧，轮胎选个好的很重要 |
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J*****a
发帖数: 4262 | 10 前后traction不一样，途锐的四驱系统和traction control系统都能帮上忙，MDX也是。
左右traction不一样，途锐的traction control能帮上忙，四驱系统不能帮忙。而MDX
的四驱系统和traction control此时还是都能帮上忙
当然，开车小心第一，雨雪慢行，车的性能是辅助而已 |
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f****t
发帖数: 15913 | 11
subaru 50：50分配动力的车之有六纲缸或手动版本，你的fxt和这个毫无关系，别自慰
了。
下面是关于AWD的评论：
What is the best 4X4 or AWD system for snow weather?
Cemtur
Answered Last
First of all, tyres (tires) are the nr 1 consideration when it's driving on
ice and snow. Motor power or 4x4 drive systems are nr 2 consideration.
I personally see that handling and grip of 2WD (two wheels drive) cars are
not worse than any 4WD SUV when equipped with good snow tyres.
I saw many examples that 2WD car with snow tyres climbs on icy hill where
4WD ... 阅读全帖 |
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W********4
发帖数: 692 | 12 2015 Legacy 2.5。发个综合贴，希望对考虑这款车的人有用。
烧机油吗？确实有点烧机油。新车开到现在2800mile。秋初入手时，机油浸没最大标线
，现在已经稍低于最大标线。按照这个速度，到6000mile有可能会烧到距离最大标线1/
5甚至1/4的地方。
什么时候换机油？手册建议的第一次换油里程是6000mile，不过本人在本版网友的指点
下决定本周换机油了。
真实MPG到底多少？我说下油枪实测的MPG。本人70% local，30% freeway。第一个
1000mile MPG大约24，最近的500mile的平均MPG29。最高的单程MPG是在一条freeway上
完成的。当时的流量较高，车速较慢，只有55mile左右。全程30mile没有停顿，电脑显
示的MPG达到了38——没闲功夫用油枪测单程MPG。
对这款车，要省油必须关掉Traction Control。本来就提速慢，开了Traction Control
提速更慢。TC造成的提速时间延长，会直接增加燃油消耗。但是关掉了Traction
Control后，车明显颠簸——这时的Legacy，可以把路上的坑坑洼洼如... 阅读全帖 |
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W********4
发帖数: 692 | 13 2015 Legacy 2.5。发个综合贴，希望对考虑这款车的人有用。
烧机油吗？新车开到现在2800mile，一点机油都没烧。
什么时候换机油？手册建议的第一次换油里程是6000mile，不过本人在本版网友的指点
下决定本周换机油了。
真实MPG到底多少？我说下油枪实测的MPG。本人70% local，30% freeway。第一个
1000mile MPG大约24，最近的500mile的平均MPG29。最高的单程MPG是在一条freeway上
完成的。当时的流量较高，车速较慢，只有55mile左右。全程30mile没有停顿，电脑显
示的MPG达到了38——没闲功夫用油枪测单程MPG。
对这款车，要省油必须关掉Traction Control。本来就提速慢，开了Traction Control
提速更慢。TC造成的提速时间延长，会直接增加燃油消耗。但是关掉了Traction
Control后，车明显颠簸——这时的Legacy，可以把路上的坑坑洼洼如实告诉你的屁股。
最让人喜欢的地方？空间大。同事普遍喜欢搭我的车，后排空间宽敞，视野开阔。打开
Traction Control后确实安稳... 阅读全帖 |
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p*********e
发帖数: 32207 | 14 也不能这么极端
全时四驱意味着同样的总驱动力,大致平均分配到四个驱动轮而不是两个
意味着每个驱动轮上的动力大致减半
也就意味着驱动力大于traction极限的可能被大大降低了
而打滑是在驱动力大于traction极限后发生的
也就是说只要是poweron也就是你的车有踩油门前进,无论是加速还是匀速行驶
四驱均有显著贡献.
不过说白了,要能行驶,根源还是traction.traction极限小的话一切都白扯
所以能提供更大的traction极限的雪胎,对雪地行驶的加成最大. |
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d***a
发帖数: 13752 | 15 假设一个车在某个弯道上，35mph时traction已经不足以提供足够的向心力
两驱车会滑出去，四驱八驱十六驱的车也一样会滑出去
如果这是你定义的极限速度，说四驱的极限速度更高，那是不可能的
违反基本的物理定律
如果traction在提供足够的向心力之外，还有多余的traction来支撑驱动
那么四驱车可以利用用在驱动上的traction，是两驱车的两倍，可以跑得更快
而两驱车的traction control，会降低驱动力，车的速度会降下来
说到底，你想要的是车在雪地打滑时，保持正常的驱动力，不降低速度
但从安全性角度来说，要保证的是车子不会滑出去，降低速度是可以接受的
雪地赛车，四驱车当然比两驱的车跑的快
可是有多少人想在雪地赛车呢？ |
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l*******g
发帖数: 27064 | 16 These days, automakers are offering more sophisticated all-wheel-drive
systems than ever. The advancements in this area are in many ways good news
for car buyers looking for cold-weather and off-road vehicle capabilities.
But there can also be a lot confusion, especially with the growing number of
technologies across dozens of manufacturers. The bottom line is, every AWD
system is different. Here's a rundown of four of the most well-engineered
systems on the market today.
Subaru Symmetrical All-... 阅读全帖 |
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X***9
发帖数: 7385 | 17 来自主题: Automobile版 - 说说斯巴鲁
斯巴鲁用户为了掩饰当初被斯巴鲁托儿忽悠才买了的弱智行为就死命维护四驱雪地关键
性的说法屡见不鲜
本田有最先进的四驱系统我也从来没有忽悠别人一定买四驱才能过冬。
国外很多媒体都辟谣过
看看下面这篇报道
主要说四驱只会帮助两驱车没法开动开起来的极限状况 比如车子出不了门 （而且局限
于两驱没有traction而另外两驱有 但现实往往这种极限状况四个轮都没有traction 这
时候几驱也是白搭）
而且实测两驱加雪胎比四驱强太多
斯巴鲁为了托就把本来占90% 的雪胎的作用有意无意忽略为零 把四驱10%可能都没有的
作用说成是没有就不行是我最看不惯的
就连加拿大某些地方雪天上路规定都是必须有雪胎而不是必须有四驱
我劝斯巴鲁托们还是省省吧 别在忽悠广大消费者了
Experts tend to blame car manufacturers for the commonly-cited wisdom that
all-wheel drive is a winter necessity, but it’s repeated so often that it
seems like truth. To... 阅读全帖 |
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n******7
发帖数: 12463 | 18 R-2要求四驱车上雪胎，并且带上traction devices
http://www.dot.ca.gov/dist3/departments/mtce/controlmp.htm
Chain Requirement Levels and Traffic Control Definitions
R-1:
Chains, traction devices or snow tires are required on the drive axle of all
vehicles except four-wheel/all-wheel drive vehicles.
R-2:
Chains or traction devices are required on all vehicles except four-wheel/
all-wheel drive vehicles with snow-tread tires on all four-wheels. NOTE:
four-wheel/all-wheel drive vehicles must carry traction... 阅读全帖 |
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p*********e
发帖数: 32207 | 19 power off的时候,也就是你不踩油门的时候,
四驱相对两驱并无优势,如果其他参数相同的话
四驱的好处就在于多两条腿爬,这样一个是你最大traction可以几乎double
另一个是如果我们简化一下假设一个衡时50:50前后轴分配动力的四驱系统,
那么在一个给定输出下前后轴的动力输出都比两驱减半
这样意味着在traction极限小(超过traction极限就会wheel spin,后果包括可能侧滑)
的场合比如雪天,更不容易出现超过traction极限的情况
但无论如何,这都是在驱动的时候.如果不踩油门,那反正目前市面上的车都是四轮刹车
安不安全,雪胎更重要.或者说,traction才是王道. |
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发帖数: 1 | 20 Silicon Carbide: Smaller, Faster, Tougher
Meet the material that will supplant silicon in hybrid cars and the electric
grid
Illustration: Anatomy Blue
Some technological revolutions are flashy, and some are almost invisible. We
’re quite familiar with the flashy ones; they’ve given us powerful
computers we can hold in the palms of our hands, devices that can pinpoint
our locations by way of orbiting satellites, and the ability to bank and
shop without leaving our homes.
But none of these innovat... 阅读全帖 |
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c***x
发帖数: 628 | 21 And this.
U.S. Pat. No. 3,831,462
"When one of the wheels loses traction with the surface of the road, the
limited slipdifferential or drive mechanism begins to differentiate and
power is transmitted from the engine to the wheel which has lost traction
and that wheel consequently begins to spin while the other wheel is not
driven. When such a situation occurs, it is essential for the differential
to lock so that the side gears are locked with respect to the carrier.
Consequently, both of the si... 阅读全帖 |
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l****o
发帖数: 832 | 22 Brake-based traction control is not a locking differential. The FJ's A-TRAC
brake-based traction control just cannot replace a true locking differential
because it requires the wheels to spin before it applies the brakes and
transfers traction. This results in a herky-jerky dance that is more
rockbouncing than rockcrawling. The lack of visibility in FJ on the trail
resulted in driving obstacles blindly while on the throttle to get the A-
TRAC traction control to kick in.
FJ does not have wheel t... 阅读全帖 |
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g*******x
发帖数: 2158 | 23 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 opposit... 阅读全帖 |
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b*********n
发帖数: 2975 | 24 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... 阅读全帖 |
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m******n
发帖数: 6327 | 25 ☆─────────────────────────────────────☆
digua (姚之FAN) 于 (Wed Feb 2 19:55:16 2011, 美东) 提到:
刚刚下班的路上，遇到一个车，后驱打滑的样子很奇怪
当时是左拐道，有冰和压实的雪，红灯，那一辆车停在最前，我是第二辆车
停在那里是我就觉得不对
那车的左后轮不停的在转，但右后轮一点都不动
仔细看看车的品牌，Ford的Mustang
等红灯变绿灯了，那车开始加速
就看到两个后轮使劲地转，屁股扭来扭去，前轮纹丝不动
我赶快打开应急灯，也没有换lane，帮对方挡一下后面的车
这里那车屁股已经扭到右边的直行lane了
这时看到一个年轻美国小伙子，二十来岁
跳下来走到车后（还差点滑了一跤）
车的engine没停，车轮还在转，他就开始推车了（人已经在直行道上了）
一开始还没推动，等我下车想帮他一把，刚问了一句
他已经推起来了，就这样一个人把车推着左拐，进了那里边上的停车站
车里再没有别人，没人打方向盘！
说实话，从来没见过这样的猛人，不过这也太危险了
顺便赞一下我的SUV加雪胎
今天路上很多冰和雪，如履平地
连... 阅读全帖 |
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t****3
发帖数: 2337 | 26 不是什么大侠，但说说我的观点，共同探讨。
1)左边那条白色带是冰不是雪，这种极端情况下实际上算在越野范畴里了，公路的话早就
关闭了。还是那个原理，上坡的冰面不能给Q足够的扭距。 Q7有电子锁差和ESP 功能，
SH为了突出自己，录像里好像没用，只用了纯Quattro。其实应该拿X5和VW Touareg来比，
因为从原理上讲即使不开ESP， X5和Touareg也能完成此任务。
2)另外，从车身反光，L与AU在雪地上的影子，录像的白平衡来看，AC的测试时间显然
和 AU/L的不同， 不是一天或不是同一时间段，这个是个很大的猫腻，比如清晨路
面上有薄冰而午后薄冰已化。
3)还有，轮胎显然不同，你看Q7在四轮全刹住的情况下还在往下滑，显然是轮胎抓地不
牢，或右轮路面有薄冰
这是回复里的：
1)the audi and lexus didnt have traction control or ESP on, thats why the
wheels keep spinning. THIS IS A FALSE REPRESENTATION OF AWD SYSTEMS BECAUSE
OF... 阅读全帖 |
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l**********i
发帖数: 11748 | 27 However, vehicle manufacturers may use a variety of different trade names
for ESC:
Acura: Vehicle Stability Assist (VSA)' (formerly CSL 4-Drive TCS)
Alfa Romeo: Vehicle Dynamic Control (VDC)
Audi: Electronic Stability Program (ESP)
Bentley: Electronic Stability Program (ESP)
BMW: Co engineering partner and inventor with Robert BOSCH GmbH and
Continental (TEVES) Dynamic Stability Control (DSC) (including Dynamic
Traction Control)
Bugatti: Electronic Stability Program (ESP)... 阅读全帖 |
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h**********r
发帖数: 2284 | 28 there's nothing novel about this 'theory'. The fact that you don't know
about it seems to be novel.
:-)
ABS kicks in when the wheels are locked and losing traction completely due
to road conditions like slippery ice; the process is to re-gain the traction
by repeated releasing the wheel brake at a high rate; otherwise, locked
wheels won't provide any traction and the vehicle cannot be stopped at all.
Thus, in bad road condition ABS can significantly reduce brake distance
before a full stop.
What... 阅读全帖 |
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a****r
发帖数: 1486 | 29 ---------"抓地力控制系统”建立在ABS之上，它利用ABS高速点刹的能力对不同的车轮
实施不同
的点刹，以保持车轮对地面的抓力。
呼唤逻辑，前驱车，有起步还刹后轮的吗？
首先，你关于ABS的防抱死理解有误。防抱死并不是指的是不能转动方向盘，而是指的
防止车轮抱死（wheel，而不是steering wheel）。车轮抱死，简单地说，就是车轮不
转了。车辆制动，靠的是刹车盘和刹车片摩擦，而不是轮胎和地面的摩擦。所以一旦刹
车踩死，没有ABS点刹介入，那么车轮实际上就被刹车片固定住，从而无法继续转动，
无法继续转动，刹车等于失效，阻力此时完全来源于轮胎和地面的摩擦。这时候，你无
论如何转动方向盘，轮胎如何转动方向，都基本无法改变车辆的行驶（滑动）方向。
ABS的介入，就是通过点刹，来继续让车轮转动，这样车辆就会继续沿着车轮转动的方
向行驶，从而达到让方向盘继续控制车辆方向的作用。
第二，traction control跟ABS没有关系。Traction Control是通过降低发动机转速来
实现的。同样的路面情况下，发动机转速越大，车轮转速越高，越容易打滑。你可以想
象一下在雪地起... 阅读全帖 |
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G*****h
发帖数: 33134 | 30 刚学习了一篇 2011 年的很好的长文
http://www.trucktrend.com/features/consumer/163_1108_4wd_vs_awd
几种典型车子：
可见非豪华 SUV 里 Grand Cherokee 是最好的
Chevrolet Silverado 1500 -- Transfer case offers 2WD, AWD, 4High, 4Low, N,
and is the only pickup truck to do so.
Ford Explorer -- Terrain Management System gives the driver three choices,
but this is more like an all-wheel drive system pretending to be four-wheel
drive.
2011 Ford SVT Raptor Supercrew Front End In Motion
Ford Raptor -- Multiple range and parameter settings ... 阅读全帖 |
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g********d
发帖数: 19244 | 31 ☆─────────────────────────────────────☆
oloolo (似人非兽) 于 (Sun Jan 12 17:05:48 2014, 美东) 提到:
1月11号，美西北越野活动成功举办，oloolo和dennny分别驾驶两部牧马人好似靓丽的
风景线，在Wenatchee的森
林中穿行。期间既有一望数十英里的广阔谷地，也有幽深的松林；伴随着变换莫测的山
地气候和暴雪，历时7个小时终于走出了雪山。
这次活动地点选在ellensburg和97号公路之间的森林公园里，NF3500转NF3507，期间下
到NF111，折腾了。
从西雅图附近开到ellensburg大约中午12点过，进山的时候天气甚好，如图一，图二所
示。整个谷地尽收眼底。不过地上有冰，旁边又是悬崖，基本是龟爬的节奏。
从NF3500转到3507的时候已经满地是雪了，但是这两条路还是paved，到了NF111就是非
铺装路面，开始给轮胎放气，深入林地了。挂上4H，牧马人handle这些路面基本小菜一
碟，一路无恙到达4W336，见图三。这是一条从NF111直接转NF113的小径，必须挂4L... 阅读全帖 |
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a**********a
发帖数: 544 | 32 here is the definition from awdwiki
automatic all wheel drive
This is an "on-demand" all wheel drive system. Under normal driving
conditions, only one axle is powered. When wheel slipping occurs (the
driving driveshaft rotates faster than the driven driveshaft), a multiplate
hydraulic clutch, viscous coupling, or other similar traction control device
locks and engages another axle. Torque gets transferred to another axle. As
soon as difference in front and rear axle speeds is eliminated, the dev... 阅读全帖 |
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B*Z
发帖数: 7062 | 33 经常有人问，今天试着回答一下。说错了，请指正。都是现在版本。
1. CRV
大名叫做Real Time AWD with Intelligent Control System。这里是官网介绍
http://www.loyaltysite.ca/HondaCRVimmersion/EN/AWD.html
The new Real Time AWD still uses a multi-plate clutch, similar to the clutch
es used in Honda automatic transmissions, to connect the driveshaft to the r
ear differential. But in place of the twin hydraulic pumps and ball cam mech
anism used previously, the system now uses an electric motor driving a singl
e hydraulic pump, which operates the clu... 阅读全帖 |
|
B*Z
发帖数: 7062 | 34 经常有人问，今天试着回答一下。说错了，请指正。都是现在版本。
1. CRV
大名叫做Real Time AWD with Intelligent Control System。这里是官网介绍
http://www.loyaltysite.ca/HondaCRVimmersion/EN/AWD.html
The new Real Time AWD still uses a multi-plate clutch, similar to the clutch
es used in Honda automatic transmissions, to connect the driveshaft to the r
ear differential. But in place of the twin hydraulic pumps and ball cam mech
anism used previously, the system now uses an electric motor driving a singl
e hydraulic pump, which operates the clu... 阅读全帖 |
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s******t
发帖数: 1956 | 35 大很多是多少？
The previous generation Pilot’s interior compared to Acura’s offering
revealed a wide gap. The Pilot simply didn’t measure up with plastic pieces
galore.
Then there’s the handling. The Acura MDX utilizes SH-AWD (Super Handling
All-Wheel Drive) while the 2016 Honda Pilot uses VTM-4. In short, VTM-4 is a
traction enhancement system while SH-AWD is capable of enhancing handling
and cornering in addition to improving traction in low-grip situations.
Additionally, it acts as a traction contro... 阅读全帖 |
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M******0
发帖数: 1280 | 36 另外，你要证明雪胎RWD,在防滑上好过普通胎四驱也不是那么容易。
打滑的原理，当轮胎向前的动力超过traction limit. 四驱和雪胎的靠的是什么防滑？
1)四驱，把动力减半，很可能就小于traction limit.
2)雪胎，动力不变, 增加摩擦力，提高traction limit.
你必须证明雪胎的摩擦系数大于等于普通胎的２倍，double the traction limit, 才
能证明在防滑上比四驱强。 |
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k*********s
发帖数: 4474 | 37 Traction control是基于4个ABS，dealer说sensor问题其实指的是ABSsensor。
ABS sensor问题导致 Traction control时亮时灭，还好不是traction control module
, 那个换一下就贵了。模块坏了灯是一直亮的，不会自己又灭。
ABS sensor冬天走盐地上容易脏，也许不需要换零件，洗干净就好了。
要是换的话零件也没多钱，主要是需要知道哪个轮子的ABS，4个都换的话没必要。
能读到traction control里的code，基本就能确定哪个轮子。
[在 jane0322 (flying jane) 的大作中提到：]
:dealer说，基本上是sensor的问题，看网上别人的经历，也是sensor或者cable的问题
:，反正修起来都不便宜，有人就disable掉，但是也建议，冬天不要这么做，会出事的。
:关键这sensor还必须去dealer那修。 |
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d*******3
发帖数: 6550 | 38 我哪里误导了，官网当然不会说那个更安全，哪个不安全了。DSC里面也没根本没提到
安全。但雨雪天traction比stability更加重要，尤其是在高速上大家速度都相对比较
快的情况, DTC提供更好的traction和动力在适当的情况下当然更安全了. 不过这个是
我个人观点，哪个更安全分不同的情况，仁者见仁，智者见智。
除非你在右道龟速爬行，那DSC和DTC没什么区别。
The DTC system is a version of the DSC in which forward momentum is
optimized.
The system ensures maximum forward momentum on special road conditions, e.g.
, unplowed snowy roads, but driving stability is limited.
Activating the Dynamic Traction Control DTC provides maximum traction on
loose ground.
Driving sta... 阅读全帖 |
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c**d
发帖数: 3888 | 39 Again, AWD doesn't make a difference in a hydroplane.
Just because a wheel is not receiving power from the engine, doesn't mean it
doesn't have traction.
A FWD car with 2 front wheels hydroplaning is perfectly capable of
maintaining the same amount of traction as an AWD in the same situation.
As you said, the tires and whether the car has traction control makes all
the difference. AWD makes no difference, except in some people's imagination
who don't really understand how traction works. |
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z*******n
发帖数: 1034 | 40 http://venturebeat.com/2014/05/09/ceo-david-helgason-on-why-uni
David Helgason has grown up with indie-game developers by providing tools
like the Unity 5 engine for building cross-platform games. As mobile
exploded, so did Unity, which can be used to publish games across Android,
iOS, PC, Facebook, the web, and next-generation consoles.
But Helgason, the chief executive of Unity Technologies, doesn’t like to
see game developers die. So the San Francisco-based company has expanded
into providing... 阅读全帖 |
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d******e
发帖数: 7844 | 41 我记错了，还真是40:60。
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... 阅读全帖 |
|
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q*z
发帖数: 13362 | 43 the best 4x4 don't have a locked ratio.
Whenever a wheel lost traction, the torque is
equaly splited to the other three wheels.
if there are more than one wheels lost traction, the torque is evenly
split in the rest of wheels. so you will never stuck unless all 4 wheels
lost traction. In that case, you should change to locked ratio, 25% each
wheel, and low gear, torture your car and pray.
Not all SUV have this sophcicated transmission system.
Most marked All wheel drive auto on the market have a |
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g*******x
发帖数: 2158 | 44 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 coul... 阅读全帖 |
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d***a
发帖数: 13752 | 45 Google了一下，你说得对
原来这个冰上车子静止不动，一个轮子转， 一个轮子不转的现象
是开放式差速器的标准问题
前驱的车可能不容易看到这个现象，一般车还会拧几下
后驱的车，traction太小，车子就不动了
http://auto.howstuffworks.com/differential3.htm
”Remember that the open differential always applies the same torque to both
wheels, and the maximum
amount of torque is limited to the greatest amount that will not make the
wheels slip. It doesn't take much
torque to make a tire slip on ice. And when the wheel with good traction is
only getting the very small amount
of torque that can be appli... 阅读全帖 |
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d***a
发帖数: 13752 | 46
其实没有很么贵
http://www.edmunds.com/suv/2011/buying-guide.html
Midsize中，GMC的Acadia，Ford的Edge和Explorer，Dodge的Durango，
Nissan Murano，不配得太高，35K以下能买到。这些车都做了很多年了，
也比较成熟。
关于full-time AWD和on-demand AWD，我个人觉得差别不大。象
老版的MDX，用的是VTM-4的四驱系统，在加速和打滑的两种情况下
由电脑启动AWD。新版MDX用的SH-AWD，在硬件设计上和VTM-4
类似（有一些改动）。主要的改动在软件上，是电脑软件让AWD系统全时
工作，并让左右轮可以有不同的torque。
从效果来说，雪天高速上full-time AWD真有那么大的差别吗？雪天
最耗traction的是刹车和转弯。匀速下，驱动车辆所需的traction并不大。
真要打滑了，traction control和ESC系统还可以纠正，也就是说对安全性
产没有什么影响。
雪天低速行驶时，full-time AWD对通过性有帮助，可以开得更快一些，
但... 阅读全帖 |
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w********8
发帖数: 73 | 47
这样说吧，我先不排除你的车有traction control之类的高级控制系统可以强行reduce
你的torque或者直接进入limp模式 （VW常见），因为你有被踩着刹车的感觉。虽然可
能性不大
>>> 首先感谢你的答复， 我的车确实有traction control， 过去按traction按钮,
仪表盘有个灯会亮，昨天我按了一下，好像现在不亮了
关键问题：
你重新把车打着，开出去100m并踩着油门的时候（就是你觉得你的车被刹车的时候），
转速跟着上不上？
转速上：那么就说明你的engine的动力根本就没传到轴子上，则基本transmission。
>>>转速跟上，疯狂空转
转速不上：踩油门就和没踩一样，这个就有些trick了，一般来说结合你之前出现的问
题，有可能是你的电脑读到你coolant的信号，强行reduce你的动力 （again，先假设
你的车有这个系统可以override你的控制）或者进入limp模式（有可能解释你的车为什
么重启之后就好一会儿）。
你需要检查你的coolant sensor，大部分车只有一个sensor，两条线，一条给电脑，一
条给你的仪表... 阅读全帖 |
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d***a
发帖数: 13752 | 48 谢谢你的好脾气。我觉得4WD是指那种四轮同步驱动，固定50%-50%(或接近)的4WD。传
统的越野4WD是没有torque control的，不管每个轮子能提供的traction是多少，每个
轮子得到的torque是固定的。再加上比普通车更坚固的transmission，low range
gears，driveshaft，前后differential，越野能力很强。如果雪很深的话或off-road
的雪地，也很不错。
全时AWD中有不少是default 50%-50% （或接近）torque split。在雪天的公路上，它
们比普通的4WD更强，因为打滑时每个轮子的torque会动态调整。Audi用Torsen的
quattro就是这种类型，纯机械反应。更多的全时AWD是用电子系统来控制的。但说到越
野，还是远不如4WD。
你说雪天公路上4WD比AWD好，是和on-demand AWD比吧。
普通4WD（锁住中差）在路上有薄雪，或更糟糕一点，有冰的的时候，恐怕不如default
50%-50% torque split的全时AWD安全。如果一个轮子traction不够，torque... 阅读全帖 |
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m******n
发帖数: 6327 | 49 ☆─────────────────────────────────────☆
marylander (Hyperdunk) 于 (Wed Jan 19 10:32:18 2011, 美东) 提到:
☆─────────────────────────────────────☆
nec213 (NEC) 于 (Wed Jan 19 11:25:15 2011, 美东) 提到:
看来subaru最牛啊
☆─────────────────────────────────────☆
TTU (Call for Drama) 于 (Wed Jan 19 11:47:08 2011, 美东) 提到:
crv highland，到处骗钱啊，越高级配置被骗得越惨。
为啥不试试outback一个轮子的, 只试了legacy。车重100磅就会是压死骆驼的最后一根
草。
☆─────────────────────────────────────☆
nec213 (NEC) 于 (Wed Jan 19 11:51:25 2011, 美东) 提到:
我以为high... 阅读全帖 |
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q***q
发帖数: 402 | 50 自己顶一下。Google结果：
Traction control involves no modification to differentials at all. The idea
is simply to apply the brake on any spinning wheel. This will slow it down
and force torque to go to its opposite number which still has traction.
NONE of the braking related functions, ABS, VSC, Atrac, Traction, etc, will
be enabled with the center differential locked.
2011 RAV4 4WD |
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