Toyota Recall: Experts Point To Electronic Throttles; Not Floor Mats In Sudden Acceleration Problem http://kansascity.injuryboard.com/automobile-accidents/toyota-recall-experts-point-to-electronic-throttles-not-floor-mats-in-sudden-acceleration-problem.aspx?googleid=275138
Robert DeGraff, January 27, 2010 I recently purchased a new 2010 Camry and am a retired professional engineer with some experience in forensic engineering investigation and have experience in applying Tepner-Tregoe analysis to puzzling situations. You have to look at "what as changed" and "what is different" between test conditions and actual field conditions in variable and extreme situations such as the reports of sudden acceleration caused or allowed by the fly by wire throttle control. The persistent but infrequent reports indicate that Toyota engineers have missed something in their testing. Although most inside engineers are resistant to suggestion from outsiders, I'll offer my comments and concerns for their review: there are several transient situations which electronic controlled vehicles must resist, commonly called EMI and RFI.
1) when you pass under, over or next to high power electric lines, not only is some energy imposed but a doppler effect can swing the frequency. Yes , some high power lines are under you, buried under the roadway such as the emergency feeders for O'Hare airport. How adequate is the EMI shielding for emissions from beneath? Some power lines are heavily loaded and emit stronger signals when they approach capacity or during surges just before and while their breakers trip.
2) cellphones, blackberies and wireless laptops also emit some strange and variable signals. I'm told that as a cellphone gets farther from its tower, it increases its power. At least 2 of the reports of apparent fly-by wire runaways mention the use of their cellphone during the incidents. Certainly these devices get very close to the car's computer(s).
3) there are stray emissions from CBs ham radios and other (sometimes illegal) broadcasting which may induce problems with RFI on computer controls. Many years ago, early computer controlled braking systems on IH trucks suffered wild scenarios until they were very thoroughly RF shielded. Could it be that some similar transients are affecting Toyota fly by wire throttle computer controls? I am not trying to be a wise guy; just offering some outside ideas for them to reconsider in their testing for the elusive cause of infrequent but terrifying runaways.
Robert DeGraff, January 27, 2010 I recently purchased a new 2010 Camry and am a retired professional engineer with some experience in forensic engineering investigation and have experience in applying Tepner-Tregoe analysis to puzzling situations. You have to look at "what as changed" and "what is different" between test conditions and actual field conditions in variable and extreme situations such as the reports of sudden acceleration caused or allowed by the fly by wire throttle control. The persistent but infrequent reports indicate that Toyota engineers have missed something in their testing. Although most inside engineers are resistant to suggestion from outsiders, I'll offer my comments and concerns for their review: there are several transient situations which electronic controlled vehicles must resist, commonly called EMI and RFI.
1) when you pass under, over or next to high power electric lines, not only is some energy imposed but a doppler effect can swing the frequency. Yes , some high power lines are under you, buried under the roadway such as the emergency feeders for O'Hare airport. How adequate is the EMI shielding for emissions from beneath? Some power lines are heavily loaded and emit stronger signals when they approach capacity or during surges just before and while their breakers trip.
2) cellphones, blackberies and wireless laptops also emit some strange and variable signals. I'm told that as a cellphone gets farther from its tower, it increases its power. At least 2 of the reports of apparent fly-by wire runaways mention the use of their cellphone during the incidents. Certainly these devices get very close to the car's computer(s).
3) there are stray emissions from CBs ham radios and other (sometimes illegal) broadcasting which may induce problems with RFI on computer controls. Many years ago, early computer controlled braking systems on IH trucks suffered wild scenarios until they were very thoroughly RF shielded. Could it be that some similar transients are affecting Toyota fly by wire throttle computer controls? I am not trying to be a wise guy; just offering some outside ideas for them to reconsider in their testing for the elusive cause of infrequent but terrifying runaways.
咳,我96年的破camry先开着吧,好像老车倒还好点。。。。。。。。
因为老车没有那么多电子元件
我们家买的就是saburu。。。
我觉得还不错,挺好的。。推荐一下不过也不便宜。。。
同样是suv,比CR-V贵5000块
我们看上了outback,实在喜欢,可是有点贵。
咳,我96年的破camry先开着吧,好像老车倒还好点。。。。。。。。
你们都是有车的,我连车都没有
subaru
honda a
我们家买的就是saburu。。。
我觉得还不错,挺好的。。推荐一下不过也不便宜。。。
同样是suv,比CR-V贵5000块
我开subaru。。。蛮好的,就是样子还不够漂亮~~~
honda a
subaru是honda的?我以为是自己一个牌子。
我们看上了outback,实在喜欢,可是有点贵。
哈哈。。。我们家的就是outback...你们看得是什么车型。。2010的?
我们家是2010的,挺喜欢的。。
你们都是有车的,我连车都没有
你那里那么方便。我要是有公共交通可以用,也不要开车啊,每次开车都被ld骂,我都有阴影了。
我开subaru。。。蛮好的,就是样子还不够漂亮~~~
他家的outback 2010换造型了。。挺好看的。。。
是啊是啊。我觉着长得挺好看的,空间也很大。还是啥无级变速,这个我就不懂了,ld说好。
我有一朋友就买的这个车 还成
无级变速不就是自动车么?
我从国内买的吃的 收到了............刚才查状况还说在纽约呢 结果没一会邮局大叔就来按门铃了
25磅的包裹
5~ 抢。。。
他家的outback 2010换造型了。。挺好看的。。。
哦,我的是forester,06年买的。。。要再开3-5年才能换新车呢。。。
我从国内买的吃的 收到了............刚才查状况还说在纽约呢 结果没一会邮局大叔就来按门铃了
25磅的包裹
Pia~~~~555555
不过我昨天自己做了1磅的泡椒凤爪。。然后都吃掉了
买吧买吧。。。我觉得男生开,女生开都挺好的。。哈哈。。
里面坐的也舒服
越说越心动。我们看上好久了。你们最后啥配置啥价钱?(如果方便,share一下。)
我真的真的很喜欢这个车。
Pia~~~~555555
不过我昨天自己做了1磅的泡椒凤爪。。然后都吃掉了
一般这是我一周的量,你真狠
哦,我的是forester,06年买的。。。要再开3-5年才能换新车呢。。。
他们家貌似前3w迈是free保养的。。反正售后服务比我的nissan好。。
不过我也挺喜欢我的altima。。。
我们家买的就是saburu。。。
我觉得还不错,挺好的。。推荐一下不过也不便宜。。。
同样是suv,比CR-V贵5000块
subaru = 土八路~
forest跟 outback有啥区别?
我有一朋友就买的这个车 还成
无级变速不就是自动车么?
貌似不一样。
哇。25磅,都是些啥啊?????
牛筋 牛肉 鸭翅 话梅 还有啥 我都快忘了........等我来拆包裹
好重啊 邮局大叔都没让我拿 直接帮我放家里地上的 说很重 你签字就成了
哦,我的是forester,06年买的。。。要再开3-5年才能换新车呢。。。
也是好车。
啦啦啦 我心花怒放
咋啦,心情好就奔
他们家貌似前3w迈是free保养的。。反正售后服务比我的nissan好。。
不过我也挺喜欢我的altima。。。
呵呵,我的也是altima
那个3w 迈free 保养的是啥车
越说越心动。我们看上好久了。你们最后啥配置啥价钱?(如果方便,share一下。)
我真的真的很喜欢这个车。
你们是在北方么,如果是在北方更适合买这个车。。它家的特点是四轮驱动是标配。。
我们家买的是现款,貌似没有什么upgrade。。不是皮椅,但是可以天黑自动亮灯,也tint过,所以可能有1000以内的Upgrade吧。。最后出门价25000
[此贴子已经被作者于2010/2/3 12:36:13编辑过]
subaru = 土八路~
forest跟 outback有啥区别?
大叔~~~去看看这个吧~~
http://online.wsj.com/article/SB10001424052748704259304575043091711640152.html
呵呵,我的也是altima
那个3w 迈free 保养的是啥车
outback。。。subaru的
[此贴子已经被作者于2010/2/3 12:37:04编辑过]
你们是在北方么,如果是在北方更适合买这个车。。它家的特点是四轮驱动是标配。。
我们家买的是现款,貌似没有什么upgrade。。不是皮椅,但是可以天黑自动亮灯,也tint过,所以可能有1000以内的Upgrade吧。。最后出门价25000
[此贴子已经被作者于2010/2/3 12:36:13编辑过]
好有钱,,,,,,,,,,,,穷人啊我们
牛筋 牛肉 鸭翅 话梅 还有啥 我都快忘了........等我来拆包裹
好重啊 邮局大叔都没让我拿 直接帮我放家里地上的 说很重 你签字就成了
多少钱的邮费啊??我也要买。
你快拆开尝尝,给我推荐个好吃的店
好有钱,,,,,,,,,,,,穷人啊我们
借了一屁股债。。现在车的title还在银行手里呢
outback。。。subaru的
[此贴子已经被作者于2010/2/3 12:37:04编辑过]
我也正在考虑买个新车。。一个车不够用了
小冷,你把零食一般放哪啊?
放肚子里最保险 哦耶
我有一朋友就买的这个车 还成
无级变速不就是自动车么?
自动车是自动换档车,每次换档都会震一下,没感觉到?
无级就是没有换档这个设计,自动匹配扭力
多少钱的邮费啊??我也要买。
你快拆开尝尝,给我推荐个好吃的店
恩 等我尝了 告诉你什么好吃
你们是在北方么,如果是在北方更适合买这个车。。它家的特点是四轮驱动是标配。。
我们家买的是现款,貌似没有什么upgrade。。不是皮椅,但是可以天黑自动亮灯,也tint过,所以可能有1000以内的Upgrade吧。。最后出门价25000
[此贴子已经被作者于2010/2/3 12:36:13编辑过]
不错。我们有点想上皮椅,但是一旦要加皮椅,就要好点的系列才有这个选项,价钱一下就上去了。
借了一屁股债。。现在车的title还在银行手里呢
5555555至少有能力借债还债
不错。我们有点想上皮椅,但是一旦要加皮椅,就要好点的系列才有这个选项,价钱一下就上去了。
而且在北方上皮椅就还得有皮椅加热...
5555555至少有能力借债还债
55555555我也没钱买那么好的车
还有香辣金针菇 什么抹茶糖 豆腐干 还有我婆婆给买的当归胶囊 好囧.........
我去打劫你吧
恩 等我尝了 告诉你什么好吃
一定啊,如果你在网上买的,要情书我卖家。。我最爱吃这些东西了
还有香辣金针菇 什么抹茶糖 豆腐干 还有我婆婆给买的当归胶囊 好囧.........
我想吃香辣金针菇。。555不说了热午饭去了
放肚子里最保险 哦耶
竟然不上当。
大叔~~~去看看这个吧~~
http://online.wsj.com/article/SB10001424052748704259304575043091711640152.html
啊,问题发酵了?
看来日本人典型的东亚式(包括中国人)出了问题遮遮掩掩的行为在美国行不通啊
先啃个什么周黑鸭的鸭翅
你这两天锁好门哈!
啊,问题发酵了?
看来日本人典型的东亚式(包括中国人)出了问题遮遮掩掩的行为在美国行不通啊
给翻译一下吧啊,。。。。后面技术问题看不懂。。。。。。。。。。。
扁鱼你看这个:
Toyota电子油门控制的安全问题
Toyota的油门问题很有些历史,但是直到最近才爆发,Toyota火速提出补丁,号称一个弹簧就可以解决. 真是这样吗? 看看历史吧.
Toyota的油门问题是从他把油门设计改成 Fly-by-Wire ETC开始就埋下隐患. 当年Toyota把 Fly-by-Wire ETC推进市场的时候, 就有很多人对它的安全问题表示担心.
所谓ETC, 就是 Electronic Throttle Control, 电子油门控制. 这是什么意思? 先从机械油门控制说起.机械油门控制,是通过一根线,就是自行车刹车线那种,从你的油门踏板连到发动机,油门开多大,全靠你自己控制, 如果这根线失效,你脚上也能立刻感觉到.
1988年,BMW第一个在7系车上推出了ETC系统,在这根机械连线周围加上了一些电子的玩意儿,后来其他车厂也见样学样, 纷纷加了ETC. 但是这些 ETC, 叫 Drive by Wire 是围着这跟线做文章, 油门踏板跟发动机的机械联系是一直存在的.
Toyota呢? 就领先了一步, 干脆把油门踏板跟发动机的机械联系给取消了, Toyota的油门踏板下面,现在是一个传感器的盒子,传感器把油门位置送给一个计算机, 然后计算机根据当前发动机运行情况,把传感器信号翻译成油门大小,这就是所谓的 Fly-by-Wire. 这样做当然是有好处的, 可以避免很多司机的技术问题或者驾驶习惯问题, 比如坡起给油不够造成死火之类的, 但是它最大的问题就是现在爆发的安全问题. 因为司机对油门的直接控制被偷油他取消了, 现在油门整个在偷油他的计算机手上了,计算机可以 overwrite 司机的油门指令,如果计算机认为应该加速,你把油门松了也没用. 换句话说, Toyota现在就跟微软差不多, 假定你是SB, 你想干什么, 他比你自己知道的更清楚.
原理说完了,那问题怎么解决呢?那要先看失效机制. ‘Fly-by-Wire’的失效机制大概可以分三类:
第一类是输入信号失效, 就是传感器送给计算机的信号错了, 司机本来没踩油门, 传感器说踩了. 这也是偷油他现在试图让人相信的失效机制,从一开始的把 MAT拿掉免得卡住油门到现在换个大点弹簧把油门顶起来,都是这个路子.为什么?因为这个最便宜,也最容易解决.
第二类是输出失效, 就是从计算机输出的电子信号到油门的控制机械这一块出的问题,如果这里出了问题,可以测,也可以重复,现在比较明确这一块没有问题.
第三类问题就比较要命了,就是计算机失效. 做过嵌入式系统的都知道, 最怕的问题就是程序跑飞, 一旦跑飞, 计算机就疯了,只能RESET. 这个捣乱最有亲身体会了, 当年他的程序就老跑飞. 程序跑飞的特点是什么呢? 嘿嘿, 无法重复. 因为每次飞的地方都不一样,而且一旦重新启动,他就完全正常了.
现在知道的Toyota致死的案子,基本都表现出第三类失效的特征: 油门突然失去控制; 事后检查无法发现失效元件; 事故过程无法重复. 这个一点都不奇怪, 汽车上的环境对电子系统最不友好了, 高温,高震动,不稳定的电源,各种高压信号乱窜,程序跑飞正常,不跑飞就不正常了. 当然了, 捣乱也有许多防止程序跑飞的招, 但是百密一疏, 总有人考虑不到的地方. 几百万辆车里面, 有几辆在某个特定情况下跑飞了,再正常不过了.解决办法一个是恢复司机对油门的机械控制, 让司机可以overwrite计算机.但是且不说Toyota有没有这么多钱,就算他有,以后还有人敢买他的车吗? 还有一个可能的办法是 open source, 他的计算机的安全漏洞, 单靠他的几个工程师是很难全堵上的, 靠 open source 人海战术, 能不能堵住先不说, 应该可以早点发现安全隐患, 找到能可以重复让偷油他的计算机跑飞的条件.
Toyota Recall: Experts Point To Electronic Throttles; Not Floor Mats In Sudden Acceleration Problem
http://kansascity.injuryboard.com/automobile-accidents/toyota-recall-experts-point-to-electronic-throttles-not-floor-mats-in-sudden-acceleration-problem.aspx?googleid=275138
Robert DeGraff, January 27, 2010
I recently purchased a new 2010 Camry and am a retired professional engineer with some experience in forensic engineering investigation and have experience in applying Tepner-Tregoe analysis to puzzling situations. You have to look at "what as changed" and "what is different" between test conditions and actual field conditions in variable and extreme situations such as the reports of sudden acceleration caused or allowed by the fly by wire throttle control.
The persistent but infrequent reports indicate that Toyota engineers have missed something in their testing. Although most inside engineers are resistant to suggestion from outsiders, I'll offer my comments and concerns for their review: there are several transient situations which electronic controlled vehicles must resist, commonly called EMI and RFI.
1) when you pass under, over or next to high power electric lines, not only is some energy imposed but a doppler effect can swing the frequency. Yes , some high power lines are under you, buried under the roadway such as the emergency feeders for O'Hare airport. How adequate is the EMI shielding for emissions from beneath? Some power lines are heavily loaded and emit stronger signals when they approach capacity or during surges just before and while their breakers trip.
2) cellphones, blackberies and wireless laptops also emit some strange and variable signals. I'm told that as a cellphone gets farther from its tower, it increases its power. At least 2 of the reports of apparent fly-by wire runaways mention the use of their cellphone during the incidents. Certainly these devices get very close to the car's computer(s).
3) there are stray emissions from CBs ham radios and other (sometimes illegal) broadcasting which may induce problems with RFI on computer controls. Many years ago, early computer controlled braking systems on IH trucks suffered wild scenarios until they were very thoroughly RF shielded. Could it be that some similar transients are affecting Toyota fly by wire throttle computer controls? I am not trying to be a wise guy; just offering some outside ideas for them to reconsider in their testing for the elusive cause of infrequent but terrifying runaways.
http://pressroom.toyota.com/pr/tms/our-point-of-view-post.aspx?id=2234
你这两天锁好门哈!
我不出门 坐家里吃
先啃个什么周黑鸭的鸭翅
这个是我的最爱,我们学校旁边就有一家这个店~~~~~
我不出门 坐家里吃
吃成熊猫状
先啃个什么周黑鸭的鸭翅
我给你抢了!
先舔一遍免得你又抢回去....
我给你抢了!
先舔一遍免得你又抢回去....
你真恶心 打的你满地找不到牙
这个是我的最爱,我们学校旁边就有一家这个店~~~~~
我第一次尝试 还可以 有点辣
吃成熊猫状
此主题相关图片如下34039_200892422305387310.jpg:
此主题相关图片如下34039_200892422305387310.jpg:
我要有她这么美就好了!
我不出门 坐家里吃
有敲门的千万别开。
此主题相关图片如下34039_200892422305387310.jpg:
太有才了。
这个fly-by-wire是仅有toyota一家在用,还是别家也在用?
这个design是它首创
但是目前看来,缺乏必要的冗余容错和override机制
此主题相关图片如下34039_200892422305387310.jpg:
哈哈哈,笑死了
我要有她这么美就好了!
偶给你做个铜钱头嫩也有这么美了
outback我有俩朋友有.我看不出啥特别的啊..
四轮驱动,无级变速。
偶给你做个铜钱头嫩也有这么美了
那个铜钱头难道不是冷老板在taobao买的?
拿到了新头饰来秀美照啊~~~
以后买车还得问清楚了是啥样的etc。
其实是大势所趋,BMW都用。关键是欧洲车不吝惜材料,屏蔽做得好,出错率很低,而且有override: 刹车踩下去油门自动失效
这个override至少可以解决所有对toyota的恐慌,但是它根本没那个财力和精力去re-design & recall 全部车型,比起加一个加强弹簧,这个工程浩大多了。
其实是大势所趋,BMW都用。关键是欧洲车不吝惜材料,屏蔽做得好,出错率很低,而且有override: 刹车踩下去油门自动失效
这个override至少可以解决所有对toyota的恐慌,但是它根本没那个财力和精力去re-design & recall 全部车型,比起加一个加强弹簧,这个工程浩大多了。
got it。谢谢!
偶给你做个铜钱头嫩也有这么美了
我装100个铜钱也比不上她..........
其实是大势所趋,BMW都用。关键是欧洲车不吝惜材料,屏蔽做得好,出错率很低,而且有override: 刹车踩下去油门自动失效
这个override至少可以解决所有对toyota的恐慌,但是它根本没那个财力和精力去re-design & recall 全部车型,比起加一个加强弹簧,这个工程浩大多了。
你这么一说,它家车没人敢开敢买了。。。。除非这个问题解决、。。。。。。。。。。。。
小鼠!!谢谢你!
我收到一个电话interview了。就在NYC的
cong!
以下是引用isachris在2/3/2010 12:54:00 PM的发言:
小鼠!!谢谢你!
我收到一个电话interview了。就在NYC的
cong!
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哈哈,很有点意思
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此主题相关图片如下3.jpg:
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玛雅,太可爱 了~~~~
小鼠!!谢谢你!
我收到一个电话interview了。就在NYC的
打你,打你,打你
我装100个铜钱也比不上她..........
没试过怎么知道。嫩快把头伸过来~~~~~~~~~~~~~
没试过怎么知道。嫩快把头伸过来~~~~~~~~~~~~~
我不!
小鼠!!谢谢你!
我收到一个电话interview了。就在NYC的
恭喜
恭喜
恭喜恭喜
我不!
你就从了球球吧
我不!
乖~~~快点伸过来让偶摸摸~~~~~
你这么一说,它家车没人敢开敢买了。。。。除非这个问题解决、。。。。。。。。。。。。
其实这个出错率并不高,可以说是非常非常低,低于ford当年的爆胎事件,
所以toyota实验室也没办法重现这个电子问题,所以大家还都是怀疑么。
主要严重的是一旦遇上,就很恐怖,这才是造成大面积恐慌的原因。
好在大家已经知道N档的用处了,也算多了个以防万一的解决方式。
你就从了球球吧
毛茸茸的抱着该有多舒服啊
此主题相关图片如下5.jpg:
哈哈
这身段
这眼神儿
你就从了球球吧
我不 她都不给我奔
哈哈
这身段
这眼神儿
怎么样,迷上了吧
扁鱼你看这个:
Toyota电子油门控制的安全问题
Toyota的油门问题很有些历史,但是直到最近才爆发,Toyota火速提出补丁,号称一个弹簧就可以解决. 真是这样吗? 看看历史吧.
Toyota的油门问题是从他把油门设计改成 Fly-by-Wire ETC开始就埋下隐患. 当年Toyota把 Fly-by-Wire ETC推进市场的时候, 就有很多人对它的安全问题表示担心.
所谓ETC, 就是 Electronic Throttle Control, 电子油门控制. 这是什么意思? 先从机械油门控制说起.机械油门控制,是通过一根线,就是自行车刹车线那种,从你的油门踏板连到发动机,油门开多大,全靠你自己控制, 如果这根线失效,你脚上也能立刻感觉到.
1988年,BMW第一个在7系车上推出了ETC系统,在这根机械连线周围加上了一些电子的玩意儿,后来其他车厂也见样学样, 纷纷加了ETC. 但是这些 ETC, 叫 Drive by Wire 是围着这跟线做文章, 油门踏板跟发动机的机械联系是一直存在的.
Toyota呢? 就领先了一步, 干脆把油门踏板跟发动机的机械联系给取消了, Toyota的油门踏板下面,现在是一个传感器的盒子,传感器把油门位置送给一个计算机, 然后计算机根据当前发动机运行情况,把传感器信号翻译成油门大小,这就是所谓的 Fly-by-Wire. 这样做当然是有好处的, 可以避免很多司机的技术问题或者驾驶习惯问题, 比如坡起给油不够造成死火之类的, 但是它最大的问题就是现在爆发的安全问题. 因为司机对油门的直接控制被偷油他取消了, 现在油门整个在偷油他的计算机手上了,计算机可以 overwrite 司机的油门指令,如果计算机认为应该加速,你把油门松了也没用. 换句话说, Toyota现在就跟微软差不多, 假定你是SB, 你想干什么, 他比你自己知道的更清楚.
原理说完了,那问题怎么解决呢?那要先看失效机制. ‘Fly-by-Wire’的失效机制大概可以分三类:
第一类是输入信号失效, 就是传感器送给计算机的信号错了, 司机本来没踩油门, 传感器说踩了. 这也是偷油他现在试图让人相信的失效机制,从一开始的把 MAT拿掉免得卡住油门到现在换个大点弹簧把油门顶起来,都是这个路子.为什么?因为这个最便宜,也最容易解决.
第二类是输出失效, 就是从计算机输出的电子信号到油门的控制机械这一块出的问题,如果这里出了问题,可以测,也可以重复,现在比较明确这一块没有问题.
第三类问题就比较要命了,就是计算机失效. 做过嵌入式系统的都知道, 最怕的问题就是程序跑飞, 一旦跑飞, 计算机就疯了,只能RESET. 这个捣乱最有亲身体会了, 当年他的程序就老跑飞. 程序跑飞的特点是什么呢? 嘿嘿, 无法重复. 因为每次飞的地方都不一样,而且一旦重新启动,他就完全正常了.
现在知道的Toyota致死的案子,基本都表现出第三类失效的特征: 油门突然失去控制; 事后检查无法发现失效元件; 事故过程无法重复. 这个一点都不奇怪, 汽车上的环境对电子系统最不友好了, 高温,高震动,不稳定的电源,各种高压信号乱窜,程序跑飞正常,不跑飞就不正常了. 当然了, 捣乱也有许多防止程序跑飞的招, 但是百密一疏, 总有人考虑不到的地方. 几百万辆车里面, 有几辆在某个特定情况下跑飞了,再正常不过了.解决办法一个是恢复司机对油门的机械控制, 让司机可以overwrite计算机.但是且不说Toyota有没有这么多钱,就算他有,以后还有人敢买他的车吗? 还有一个可能的办法是 open source, 他的计算机的安全漏洞, 单靠他的几个工程师是很难全堵上的, 靠 open source 人海战术, 能不能堵住先不说, 应该可以早点发现安全隐患, 找到能可以重复让偷油他的计算机跑飞的条件.
Toyota Recall: Experts Point To Electronic Throttles; Not Floor Mats In Sudden Acceleration Problem
http://kansascity.injuryboard.com/automobile-accidents/toyota-recall-experts-point-to-electronic-throttles-not-floor-mats-in-sudden-acceleration-problem.aspx?googleid=275138
Robert DeGraff, January 27, 2010
I recently purchased a new 2010 Camry and am a retired professional engineer with some experience in forensic engineering investigation and have experience in applying Tepner-Tregoe analysis to puzzling situations. You have to look at "what as changed" and "what is different" between test conditions and actual field conditions in variable and extreme situations such as the reports of sudden acceleration caused or allowed by the fly by wire throttle control.
The persistent but infrequent reports indicate that Toyota engineers have missed something in their testing. Although most inside engineers are resistant to suggestion from outsiders, I'll offer my comments and concerns for their review: there are several transient situations which electronic controlled vehicles must resist, commonly called EMI and RFI.
1) when you pass under, over or next to high power electric lines, not only is some energy imposed but a doppler effect can swing the frequency. Yes , some high power lines are under you, buried under the roadway such as the emergency feeders for O'Hare airport. How adequate is the EMI shielding for emissions from beneath? Some power lines are heavily loaded and emit stronger signals when they approach capacity or during surges just before and while their breakers trip.
2) cellphones, blackberies and wireless laptops also emit some strange and variable signals. I'm told that as a cellphone gets farther from its tower, it increases its power. At least 2 of the reports of apparent fly-by wire runaways mention the use of their cellphone during the incidents. Certainly these devices get very close to the car's computer(s).
3) there are stray emissions from CBs ham radios and other (sometimes illegal) broadcasting which may induce problems with RFI on computer controls. Many years ago, early computer controlled braking systems on IH trucks suffered wild scenarios until they were very thoroughly RF shielded. Could it be that some similar transients are affecting Toyota fly by wire throttle computer controls? I am not trying to be a wise guy; just offering some outside ideas for them to reconsider in their testing for the elusive cause of infrequent but terrifying runaways.
http://pressroom.toyota.com/pr/tms/our-point-of-view-post.aspx?id=2234
哇,大叔,你好博学哦
哇,大叔,你好博学哦
nod,大叔很强啊
其实这个出错率并不高,可以说是非常非常低,低于ford当年的爆胎事件,
所以toyota实验室也没办法重现这个电子问题,所以大家还都是怀疑么。
主要严重的是一旦遇上,就很恐怖,这才是造成大面积恐慌的原因。
好在大家已经知道N档的用处了,也算多了个以防万一的解决方式。
。。。。。。。。。。。人真到那个时候很肯能僵住的。。。。。。。。。。。我还是很恐慌。。。。。。。。。。。。。用n档那是下下策了。。。。。。。。。
就算出错率不高,但是潜在危险在那里,开车还是很提心吊胆啊。。。。。。。。。。。。。。。。。
哇,大叔,你好博学哦
他不是ZT的吗?
对,我的是第一次。。。。。。。。。。
哦也,我得到了你的第一次~
哇,大叔,你好博学哦
俺转的。。。呵呵
俺就是对这类民科感兴趣,见笑了
nod,大叔很强啊
民科,民科