B*Z
发帖数: 7062 | 1 此帖到目前都是完全说错了，被楼主给带到弯路上了。油门响应是throttle mapping。
德国高档车throttle mapping恰好是不灵敏的，比较线性。开快车，尤其快速过弯好使
。日本德国美国买菜车其实throttle mapping更aggressive。这样开起来感觉比较轻松
。google一下吧。 |
|
B*Z
发帖数: 7062 | 2 这个都不是主题，主题是dsb要证明使用了egr不会降低mpg。纠结这个问题，就偏题了。
如果讲egr的主要用处，要从pump loss开始。throttle不打开，发动机抽气会损失能量
。所以大脚油门需要动力的时候，要throttle全开。全开了throttle，进来很多空气，
就必须喷很多油来match。但是这样就高温高压产生很多nox。这个问题不能通过少喷油
解决，因为这样会lean burn。在大多数不能lean burn的发动机里面，lean burn 是很
危险的，会knock。所以解决办法就是加入废气。这样真正氧气少了，氧气和燃料的比例
基本不变，喷油减少。这样降低温度，减少nox。 |
|
i********e
发帖数: 1782 | 3 On Thursday October 24, 2013, an Oklahoma court ruled against Toyota in a
case of unintended acceleration that lead to the death of one the occupants.
Central to the trial was the Engine Control Module's (ECM) firmware.
Embedded software used to be low-level code we'd bang together using C or
assembler. These days, even a relatively straightforward, albeit critical,
task like throttle control is likely to use a sophisticated RTOS and tens of
thousands of lines of code.
With all this sophisticati... 阅读全帖 |
|
C******a
发帖数: 119 | 4 Not sure if the problem has been fixed completely. Just found out that you
can replace Injection Throttle Body, which is the problem for some people,
by yourself.
ACDelco 217-3104 GM Original Equipment Fuel Injection Throttle Body with
Throttle Actuator. |
|
c*****r
发帖数: 140 | 5 全国范围Verizon最快。
T-Mobile has intentionally boosted its performance by turning off throttling
when customers run speed tests.
T-Mobile customers who have exceeded their high-speed data limits can test
their throttled speed by using the RootMetrics app.
https://www.publicknowledge.org/news-blog/blogs/t-mobile-disguising-
throttling-with-new-speed-test-data-cap-exemptions |
|
c**********e
发帖数: 694 | 6 Replace throttle body sensor itself is cheap, parts is around $30, labor at
most half hour for most cars. I don't know the exact configuration on a
nissan, but I guess it should not cost more than $75 to get it fixed. I will
address the problem in following way ( I assume you know where the throttle
position sensor, it is plugged into throttle body, if not just google to
get some sense),
1. First, visually check if the sensor is tightly plugged in, any
damage on the wire.
2. If no dam |
|
l*******s
发帖数: 7316 | 7 https://social.ringplus.net/discussion/9727/moon-shadow-members-important-
announcement
Late last night, Karl posted this information
Karl:
"If you are on Moon Shadow Surfing Plan. Please don't change your plan right
now. We will make a Mad Moon Shadow available during our transition to the
new system. If you switched already we will find you and you will get the
upgrade via our reward system."
____________________________________________________________________________
________________________... 阅读全帖 |
|
x*****n
发帖数: 3422 | 8 我瞎说几个，你随便听听：
1。look ahead，这个说起来容易做起来难，据说至少要提前两个session。我最多也就
瞄瞄下一个session，还经常盯着apex不放，呵呵。这直接导致我走线不够好。
2。throttle control。我去年前半段过slalom的时候基本constant throttle，速度不
够踩深点，速度过了踩浅点。后来才意识到可以通过throttle控制车的oversteering/
understeering倾向，配合方向盘的节奏踩油门。其实course的绝大部分都能这么干，
比如clamshells。我现在还是处于东施效颦阶段，力度拿捏/时机都和高手有差距。
3。downshift，autocross降一档的机会不多，不过一旦有这种180度变态慢pivot，
downshift好不好能差半秒。很多了。
4。尽早push to the limit。我这人比较ws，经常到了下午的session才真正找到limit
，调整都来不及了，最后成绩总比理想的要差~1秒
5。硬件trick, 每个class总是有些trick的。比如stock class：brak |
|
w******x
发帖数: 4396 | 9 他写错了。iac和throttle body就两个口，都是给空气的。那个coolant line实际上是
给throttle body加热的。防止throttle icing. |
|
a********e
发帖数: 3771 | 10 From saabcentral forum:
p1260: the Throttle return spring too low force:
Turn the ignition off, wait a little while and then manually operate the
throttle to check for smooth motion, clean and repair as necessary
If limp-home is active, it MUST be reset manually and then the DTCs must be
reset with the code reader. If this persists, you may need a new throttle
body but that should be you last option.
http://www.saabcentral.com/forums/showthread.php?t=152768 |
|
i****x
发帖数: 17565 | 11 根据 http://en.wikipedia.org/wiki/Direct-Shift_Gearbox 介绍（DSG，用在vw车上）
the DSG takes only about 8 milliseconds to upshift
Downshifting is similar to upshifting but in reverse order, and is slower,
at 600 milliseconds, due to the engine's Electronic Control Unit, or ECU,
needing to 'blip' the throttle, so that the engine crankshaft speed can
match the appropriate gear shaft speed.
Pressing the throttle / accelerator pedal will fully engage the clutch, and
causes an increase of forward vehicle speed,... 阅读全帖 |
|
d******g
发帖数: 6966 | 12 "But all that extra torque isn't nearly as controllable coming from the
turbos. This may be the only downside when compared with the V-10. While the
naturally aspirated engine seemed to have a direct physical connection from
the driver's ankle to the car's 10 individual throttle bodies, the
turbocharged V-8 is a little more of a game of telephone. Push down on the
throttle pedal, feed the engine a bit more air, wait for the turbos to spool
, and then get ready to counter steer. The impatient wil... 阅读全帖 |
|
p*********e
发帖数: 32207 | 13 换句话说,在2000rpm,70mph巡航的时候(这时候进气冲程结束缸内气压明显小于0.7bar)
,整个发动机就是处于NA工况
因为被增压的空气已经被blowoff valve导出到增压前的进气道
一旦kickdown,throttle valve全开,这一瞬间throttle valve外的气压仍然是大气压
(因为blowoff valve此时开启,进气道与大气连通)
那么这时候发动机工作在NA工况所能允许的最大扭矩输出
同时因为这个输出明显高于行驶阻力,发动机转速开始升高
同时因为throttle valve两侧压差<0.3bar, blowoff valve关闭
之后发动机开始处于turbocharged工况,
而何时能达到峰值输出则取决于排气量何时达到需要的值,
使得compressor可以让进气增压到指定压强. |
|
V***b
发帖数: 3419 | 14 我是这么理解的，如果throttle valve内外的压力差（内大外小）大于等于0.3bar的时
候，为了避免机械损伤和surge，blow-off valve打开，把内部更大的boost pressure
导入turbine另一侧。比如外面大气压1bar，throttle valve内压力1.3的时候（压力差
0.3）blow-off valve打开，或者高海拔外面大气压0.8bar，throttle valve内压力1.3
的时候（压力差0.5）blow-off valve打开.。 |
|
p*********e
发帖数: 32207 | 15 我觉得你要是有心研究的话不妨把我说的文档读下
这里有一个图画的很清楚,两个pressure sensor,分别在进气歧管附近,
以及进气道immediately before throttle valve附近
而blowoff valve所在的管道,一边连在进气道throttle valve之前,一边与大气连通
而不是像你想象的那样与throttle valve之后的进气歧管连通.
pressure
.3 |
|
i****x
发帖数: 17565 | 16 自从我写过xc90评测，提到噪音较大，就有人同意有人反对。我其实也略有怀疑，因为
毕竟噪音算半主观感受，也可能受心里影响。不过现在很多xc90路测出炉了，可以看看
仪器的测试。
我当时的感受是，xc90算不上安静，跟小一号的Q5类似，明显不如不如x5。下面是
edmunds的仪器测试结果。
xc90：
@ idle (dB) 43
@ Full throttle (dB) 70
@ 70 mph cruise (dB) 63.2
q5：
@ idle (dB) 47.5
@ Full throttle (dB) 69.5
@ 70 mph cruise (dB) 64.1
x5：
@ idle (dB) 39.8
@ Full throttle (dB) 71.5
@ 70 mph cruise (dB) 61.5
要注意分贝是log尺度的指标。简单地说，分贝差10，就意味着声音大一倍，换算下来
大致是分贝差1声音大7%，差2大15%，差3大25%。另外噪音测试随仪器、环境不同可能
有较大偏差，所以仅供参考。比如我记得Q5 idle... 阅读全帖 |
|
c****d
发帖数: 224 | 17 你没好好看片子，空速失灵是有解的。这个片子很牛，在黑匣子找到之前拍的，和后面
黑匣子找到之后的结论基本一致。基本上就是飞行员忽略了throttle level和飞行攻角
，右边飞行员还不顾警告乱拉侧杆让飞机爬升造成失速。这在飞机throttle level不够
的情况下基本是找死。
空客的设计非紧急情况下是很爽，但是也造成了飞行员实战能力的不足。其实开车也一
样。cruise也很爽，但是容易让driver感到乏味警惕性下降。我一般都是cruise和手动
换着用。 |
|
A**4
发帖数: 2165 | 18 It should be a reject landing case. So if he push for the full throttle and
pitch up, the procedure is correct. The issue is that if the speed is
already to slow and there is not enough altitude to recover.
Also the landing speed is lower than the takeoff speed. It should be close
to stall for landing and 1.2 times for takeoff.
It would also take about 1 to 2 seconds for full throttle to be effective,
since it's such a heavy airplane. |
|
w****y
发帖数: 2501 | 19 NTSB "Call to go around made approx. 1.5-sec prior to impact."
-7秒的throttle forward应该不是full throttle |
|
b***n
发帖数: 590 | 20
-7秒飞行员如梦方醒一般接管了此前一直idle的throttle.
当时airspeed已经在100上下了，如果还不是full throttle,
飞行员是吃屎的还是吸毒了？ |
|
g**1
发帖数: 10330 | 21 NTSB @NTSB 2h
The throttles were advanced a few seconds prior to impact and the engines
appear to respond normally. #Asiana 214
NTSB @NTSB 2h
The data indicate that the throttles were at idle and the airspeed slowed
below target approach speed during the approach. #Asiana 214 |
|
r***e
发帖数: 2000 | 22 "The data indicate that the throttles were at idle and the airspeed slowed
below target approach speed during the approach."
As I had speculated, the pilot let the plane free drop between
37.59 and 37.6. Then seconds before the impact, the pilot
beat the throttles, then complained the engines did not
respond fast enough. Were they on crack? |
|
发帖数: 1 | 23 Autogyros Flight characteristics
Autogyros are often regarded by fixed-wing aircraft pilots as "dangerously
unstable", which is certainly true if one tries to fly an autogyro using
fixed-wing principles. Piloted properly, a autogyro is slightly safer than a
fixed-wing aircraft because it cannot stall. A "stall" does not mean an
engine-out event, it means a fixed wing aircraft is travelling too slowly
for the wings to produce lift. Since the rotor of a autogyro is always
spinning, it cannot stall... 阅读全帖 |
|
s*****t
发帖数: 1661 | 24 上面两个回复根本就没理解楼主说的控制是啥意思。
本质上汽车的控制就是一个throttle和yaw的二维输入的闭环控制。飞机，最简单的也
是yaw,roll,pitch,和throttle的四维输入的问题。高级一点的玩具航模上就体现这点
了。
另外飞机还有其他控制面的输入，也增加问题的维度，飞机的油门也许还有桨距也比汽
车的更高维。
随便控制到能飞容易，做最优控制或者一定程度上的最优，数学上就很难。闭环最优控
制的死穴就是维度。高维偏微份方程，数值解也不容易，算得足够快更难。
飞机还有一个不同于汽车的问题就是，飞机，特别是战斗机，常是非协调飞行，通俗比
喻就是类似汽车一直处于侧滑飘移状态，设计自动开车的顶多考虑如何避免进入和改出
这种状态而不会考虑如何在这种状态下控制吧。问题又容易了很多。
静不稳定也不是啥大事儿，自行车都会骑吧。更不稳定的独轮车，走钢丝人都独自搞定
。电传与否和由人还是电脑控制飞行姿态完全是独立的两件事情。通航螺旋桨小飞机非
电传的配自动驾驶的，自动驾驶的时候照样是电脑控制姿态，控制范围有限而以。电传
的大飞机，侧风降落的时候bank还是slip完全在飞行员的手脚上。
... 阅读全帖 |
|
发帖数: 1 | 25 马斯克透露，将很快开始测试星际载人飞船系统， 推力是土星五的两倍！
Musk: Atmospheric tests of interplanetary spaceship could happen next year
March 13, 2018 Stephen Clark
Artist’s concept of the BFR spaceship deploying a satellite in orbit.
Credit: SpaceX
A team of SpaceX engineers is building a prototype of the spaceship Elon
Musk hopes will one day carry people and cargo deep into the solar system,
and it could begin low-altitude testing next year, kicking off a multi-step
test campaign before eventually going into space, the... 阅读全帖 |
|
|
u**s
发帖数: 9 | 27 Part VI
My right foot was probably my happiest body part at this moment…..the
throttle felt firm but very responsible…..i nailed 1/3 in….what happened
below I could not even explain till now…..the push-back, the sound, the blur
vision….am I kidding…no….3.3 seconds to 60mph…. I wasn’t close to
that….but 1/3 of throttle paddle traveling equals “holy f**k” acceleration
……since I put her in the racing mode….the rpm needle blip like crazy into
5000…in a fraction of second to me…..
I easy off the foot |
|
G******e
发帖数: 9567 | 28 http://safecars.wordpress.com/2010/02/19/brake-overrides-the-devil-in-the-details/
Brake Overrides: The Devil in the Details
Why Toyota does not install brake overrides of the throttle control system
on all their recalled cars and future models is a topic of considerable
discussion. Toyota has indeed announced that they will have such ’smart
brakes’, which prioritize braking actions over throttle actions’, in
future models. In addition, some but also past models will be upgraded with
a softwa |
|
d****b
发帖数: 346 | 29 throttle body, egr的可能性最大，估计是积炭过多，valve开合有问题，清洗
throttle body 和 egr valve基本可以解决。10年以上的老车这个也算常见问题，一般
是engine内漏机油至燃烧不充分，导致回气积炭过多。05年的车不应该有这样的问题。
所以除了清洗外，最好查一下engine漏油的情况。 |
|
m*******t
发帖数: 19 | 30 Sounds like both cases fit into the situation of "Engine idle stall". Google
it, you will see the 1st step is to rule out vacuum leak, 2nd step is to
clean up the throttle body. Guys should have enough strength to do it
yourself. Or, you can find a mechanic to do that for you, just tell them you
want to them to clean the throttle body both inside and outside. DIY link:
http://www.popularmechanics.com/how_to_central/automotive/1272341.html?page=1
You don't have to buy the cleaning kit, though. |
|
o*******g
发帖数: 553 | 31 do engine tune up: check spark plugs, fuel filter, air filter, idling air
control valve, clean throttle body if dirty. Replace them if they are not
good.
If problem still exists, continue to check sensors: camshaft position sensor
, crankshaft position sensor, throttle position sensor,..., also check fuel
pump pressure, fuel pump relay, fuel injectors, ....
I recommend you go to trustful mechanics to do diagnostics. It is very
dangerous to drive a car with such problems. |
|
o*******g
发帖数: 553 | 32 Check the cheapest ones first such as clean Throttle body, throttle position
sensor, check idling control valve. If all these are fine, then check
crankshaft position sensor, camshaft position sensor. My car has similar
problem, and finally it is crankshaft position sensor is bad. |
|
p******r
发帖数: 6213 | 33 你理解得有限. 还包括MAF、throttle body、Idle Air Control valve等。你车的症状
更象是throttle body和IAC太脏。 |
|
l******a
发帖数: 10467 | 34 来自主题: Automobile版 - EGR问题 需要， 主要是气路上的东西， 这么老的车， 都需要清理， 管子上拆下来很容易，
但是要用专用的清洗剂， 这个东东应该就在air filter的后面， 然后清理throttle
body, egr阀， 这个用seafoam就行了， 或者throttle boday/intake cleaner |
|
t********6
发帖数: 163 | 35 My 2000 ford Taurus has somewhat similar symptom in 2008. I did not go very
far to check. Techron filter injection system cleaner did NOT improve. I
learn how to keep it going for a while (when it start to idle or run rough,
I just step on gas and open the throttle a bit more). Then I donate the car
(I don't like it overall so there is no point for me to repair it futher).
One thing I could try if I were you is to clean the throttle body. (there
should be quite a bit of carbon deposit at this ag |
|
g*****9
发帖数: 4125 | 36 Noise should be measured by those 3 spec, idle, full throttle and cruising.
Not all car excel in all 3 category.
If you use full throttle to accelerate all the time, that is the spec you
should be looking for.
I usually look for the crusing quietness in a car first. (which is combined
wind noise, tire noise and engine noise)
some car use active noise cancelling technology, which use the audio system
to cancel noise.
Other car use a lot of noise absorbing mateial along with double layer
windows t |
|
n********7
发帖数: 1593 | 37 可能是供油出的问题吧， throttle 太脏了， 我的车也发生过这样的问题， 但只是冬
天发生过大概2，3次， 不常见，所以也没法子拿去修。
洗throttle还挺贵的， 建议退了算了 |
|
h*********r
发帖数: 1940 | 38 好像Autozone取消这个服务了，Autoparts或者其他的地方有租的吗？
我知道Autozone给免费查，但我现在的车停在车库里，SES灯亮，而且无法加速，踩油
门不加速。想先查查code.实在不行，只能叫拖车了。车是Nissan Altima 2005.
首先感谢楼上的几位，特别是boston的那位，可惜我在chicago.我的车是2005款，但是2004买的，保修期已过。昨晚我把电池断开，为的是clear code,然后看是否service engineer soon light还亮。今天早上重新接上电池时，发现coolant level很低，已经低于Low Limit level了。于是重新加了些coolant,接上电池后，重新启动。ses灯不亮了，也可以加速了，没多开，就在小区里转了一圈，好像没什么问题。我想是不是coolant level低，使得车子进入保护状态（网上有人叫“limp in mode”）.如果过几天，问题再出现，只能去dealer那查了。我知道nissan altima的throttle position sensor很容易坏，而且只能整个throttl... 阅读全帖 |
|
l****g
发帖数: 1922 | 39 呆Ｂ autozone，我以后再也不去了
上星期洗了throttle body，sensor位置没调好，周末又调了一下
开出去亮了一堆灯，正好在autozone旁边，就去让读个码，
有两个码，一个 throttle body position sensor的码，一个iac的码，
那个店员非逼着我卖sensor，60$，我说sensor没事儿，可能是个socket坏了，
你能帮我找找socket么，结果傻Ｂ店员马上态度非常恶劣，说我这儿没有socket
我也不知道你的socket什么样子，不拉不啦说了一堆，
操，车是自己搞坏的，还能不知道哪里的问题？
这店也太夸张了，我买了一堆工具零件，非常后悔，以后绝不去了 |
|
h*********r
发帖数: 1940 | 40
是2004买的，保修期已过。昨晚我把电池断开，为的是clear code,然后看是否service
engineer soon light还亮。今天早上重新接上电池时，发现coolant level很低，已
经低于Low Limit level了。于是重新加了些coolant,接上电池后，重新启动。ses灯不
亮了，也可以加速了，没多开，就在小区里转了一圈，好像没什么问题。我想是不是
coolant level低，使得车子进入保护状态（网上有人叫“limp in mode”）.如果过几
天，问题再出现，只能去dealer那查了。我知道nissan: altima的throttle position
sensor很容易坏，而且只能整个throttle换掉，大概需要300多刀。希望不是这个毛病。 |
|
l****g
发帖数: 1922 | 41 嗯，那就按常规的来，先换 oil 和 oil filter，不管用的话，再看油路和气路。
fuel filter不是oil filter，
oil是机油
fuel是汽油，汽油从油泵 fuel pump里泵出来，先经过filter过滤，
然后再到几个 injector，喷到汽缸里。
其实踩油门，有两个动作， 拉大气门 throttle body，然后throttle body position
sensor告诉系统，要增加油，油泵送油。。 |
|
w**********y
发帖数: 6 | 42 throttle body太脏可以清洗吗，
是不是很麻烦？
我的intake tube靠近throttle body
的地方曾经破过，大半年没管它，后来换的时候
才发现air filter 很脏，甚至还有树叶。
难道是这个原因？
欢迎大家继续发表见解，多谢！ |
|
w**********y
发帖数: 6 | 43 昨天咨询了几个修车师傅，有人说要整个换throttle body, 有人说要
换throttle sensor. 他们都没有用仪器检查。
我国内的朋友(老司机)说只要清洗一下油路就可以了。说法差别都很大。
而且我的朋友和本版回答我问题的各位都没人推荐我换大东西。 |
|
s*****8
发帖数: 606 | 44 最近经常看到论坛中有人提问发动机冷启动不了，根据所学的一点知识总结以下，不足
处望改
正。
该文章为原创。本人不是学汽车的，跟mechanical关系也不算大，汽车只是个人爱好，
以下所
有内容均为自学，所以可能存在不足或有误，希望高人修正指导。
在列出可能造成熄火或者怠速异常因素之前，应该先明白发动机怠速时的基本知识—保
证空
气/汽油比例正常，这里说的正常是比发动机理想状态下空气/汽油比14.7:1汽油输出量
要高，
通常称为rich mixture，因为在冷启动时发动机需要更多的汽油来保证正常运转。
混合气进入气缸中的过程：空气通过intake vacuum进入，通过节气门与汽油混合进入
气缸
PS曾经看过一视频，发动机怠速不稳定，转速表不停的上下摆动，后来原因为drive
belt的问
题
- Mass airflow sensor：heated sensor测量进气流量
- Manifold absolute sensor：测量进气压力
- Intake air temperature sensor：测量进气密度
- Coolant sensor：间接... 阅读全帖 |
|
n****i
发帖数: 109 | 45 99% it is throttle body dirty.
go to walmart to buy a bottle of Throttle Body Cleaner(<$5), use a tooth
brush to clean TB(<10min). Then you will have smooth start.
Please send me a mail when you fix the problem.
It has nothing to do with tranny, don't go to any garage, they will charge
you a lot for it. |
|
I****h
发帖数: 33 | 46 要看路面的情况。
如果路面摩擦力小（比如雪地），那么请你千万在入弯前把速度减到位，然后在弯中千
万别踩刹车，匀速通过。
路面情况好的话，关系不大，凭感觉开就行了。另外跟你的车是前驱还是后驱也有关系
，比如万一出现understeer，也就是转弯半径过大，那么前驱的车应该踩刹车，而后驱
的车应该加速，对这些细节感兴趣的话，可以去看http://www0.epinions.com/auto-review-29AF-D5B5AC5-394D2268-prod5。
quote:
If the car understeeers in the turn, you have to lift off the throttle and
slow down. In RWD car, if the car understeers in the turn, you can increase
the throttle (not before the mid corner!) and car will start oversteering,
correcting the trajectory.
要是
道踩
一大... 阅读全帖 |
|
l**s
发帖数: 20567 | 47 是在dealer 做的
还有个问题想问
除了timing belt, 我还加了 Transmission flush 用的coupon,
还有 Clean Throttle body,这个什么都没用
在给我的单子上，只有Clean Throttle body 前面特别加了 customer states ....
以前还真没看见过dealer这样列单子的
不过能看出来的确实在接air filter 管口有清过
不会有什么猫腻吧？ |
|
t**l
发帖数: 68 | 48 Throttle cable might be too tight. If you know where the throttle cable is
under the hood, you can tap it to see its responsiveness.
This is some safety issue and I would recommend to check ASAP. |
|
a*****y
发帖数: 46 | 49 sentra就容易了，找到fast idle的位置，就是throttle的上面，有根管子，那是fast
的进气口，买瓶throttle cleaner，在发动车的状态下，往里面喷cleaner，几次就好
了，呵呵，这是最好的清洗方式了。。。。。不过喷的时候发动机会乱吼，不理就是了
，喷完装上管子就好了。
还有换火花塞不要用bosch的，似乎和nissan兼容不好。
Good Luck！ |
|
y*****c
发帖数: 224 | 50
really,?! 本人拿照不超过半年，连throttle 在哪里我都找不着，能不能给个
protocols，在哪
里买throttle body cleaner，fast idle valve长啥样，在哪里，如何喷等等，送佛送
到西，谢
谢了！！！！ |
|
