10 ms·

The Toyota Witch Hunt

149 points by gyeh 17y ago

GrandMasterBirt 17y ago
Wow. A wonderful article. The real question is, just how in-control is the computer. And how much has to go wrong such that uncontrollable acceleration happens and nothing can override that acceleration such that no matter what you do the computer makes the car go into "drive" and accelerate to the max, without responding to other parts of the system like the breaks and such.
- kolosy 17y ago
  short answer - the brake system has to suffer a mechanical failure. read the part where "brakes always win over engines".
  - deleted 17y ago
    [deleted]
- sliverstorm 17y ago
  The accelerator pedal would have to be immovable, frozen in place. The ignition switch would have to lock or otherwise malfunction The shift lever or clutch or automatic shift lever would have to malfunction The brakes would have to overheat (does not really happen much in a production car). It is not 100% true that brakes will always overpower the engine, but the cases in which they don't are the ones with massive 700hp engines with big 'ol turbos and stock drum brakes, and in that situation it's the owner's responsibility. There would also have to be no runaway truck exits. If you were creative and knew something about cars, you could pull one of many fuses from the fuse box. On cars I've serviced, the computer fuse is always in the driver kick panel, so just rip off that panel and start yanking fuses while watching the road. It should be noted that the e-brake on fwd cars is not your best choice (though still a decent choice); while a locked up wheel provides drag, it does not apply as much drag as a rolling wheel with maximum braking (which can easily be obtained cause of ABS). Also at extreme speeds you run the risk of a spin, which puts you possibly at risk for a roll.
  - lanstein 17y ago
    There is about a .000000001% chance you just saved my life. Thank you. (edited math)
  - jonknee 17y ago
    > The accelerator pedal would have to be immovable, frozen in place. In recent Toyota vehicles the pedal isn't connected to the throttle--it's drive by wire. In theory the computer could continue accelerating regardless of the gas pedal's position.
    - cryptnoob 17y ago
      I've designed systems like this. You use redundant potentiometers to sense throttle position. If they don't match within 5%, you power down. You also toggle bits in your code. One in the main loop, another in any interrupt service routine that you are dependent upon. These bits then go to a GPIO so that the GPIO toggles. If the ISR freezes or the main loop freezes, the GPIO quits toggling. You then have an hardware, RC-Diode type circuit, that stays high if it's input toggles, but goes low, if it's input goes low and stays low, or goes high and stays high. The output of this circuit drives a relay, so that if the CPU quits toggling the GPIO, the relay clicks off. The output of that relay is a dead-man's switch that powers down the vehicle. The end result is a hardware fail-safe if the CPU misbehaves. There are other tests to confirm that the relay isn't frozen, that the RC-Diode circuit isn't frozen, etc. So, in theory, if a high-school sophomore designed the vehicle, you might have a problem. Otherwise, I think you don't give the engineers that design these systems enough credit.
      - jonknee 17y ago
        ... And yet there are out of control cars without the pedal being stuck. "Well, I have many models of Prius that got recalled, but I have a new model that didn't get recalled. This new model has an accelerator that goes wild, but only under certain conditions of cruise control. And I can repeat it over and over and over again--safely." "This is software. It's not a bad accelerator pedal. It's very scary, but luckily for me, I can hit the brakes," he said. -- Steve Wozniak http://news.cnet.com/8301-13924_3-10445564-64.html http://news.cnet.com/8301-13924_3-10445564-64.html
sliverstorm 17y ago
Thank god! I have heard only from people who buy into the witch hunt (and an excellent name for it, that is). I am really very glad to see I'm not the only person who realizes most of it is ridiculous and overblown. Hell, even if the gas pedal corroded AND the floor mat held it down, has not one of these drivers even though to reach down and PULL the goddamn thing up? I pray people realize this is folly... I don't know what we're gonna do if stupidity brings down the pillar of the auto industry, through no fault of it's own.
- kolosy 17y ago
  see audi circa 1987. http://en.wikipedia.org/wiki/Audi#Reported_sudden_unintended_acceleration http://en.wikipedia.org/wiki/Audi#Reported_sudden_unintended...
- tome 17y ago
  Witch hunt is a great word. When I watched a CNN clip of one woman giving evidence about her "broken" Lexus I felt a very strong analogue to Arthur Miller's The Crucible.
- mediaman 17y ago
  I don't disagree that this has been overblown, but in fairness it would be fairly difficult to reach down and pull the gas pedal up while the engine is raging and the vehicle is undergoing significant forward acceleration, while the driver is presumably trying to avoid colliding into other vehicles and objects. Of course, they should just shift it to neutral and let it redline.
  - sliverstorm 17y ago
    Yes to the second part as for the first part, doesn't have to be your hand. Depending on the vehicle, you might be able to get your toe under the pedal.
Splines 17y ago
This whole Toyota debacle makes me wonder if competing car companies buy cars made by other manufacturers and poke at them in the hopes of having something just like this happen.
- mahmud 17y ago
  The risk of being caught doing that is grounds for bankruptcy and life sentences.
erlanger 17y ago
I hold the conspiracy theory that these issues are being so aggressively sought out in an attempt to bring Toyota's image down to the level of American auto manufacturers.
- presidentender 17y ago
  I wholeheartedly agree. The sheer number of failures that have to occur, the low level of action on the drivers' parts required to overcome the problem (put it in neutral! Use your brakes! Use your parking brakes!), the speed and intensity of the government's response, and the fact that GM is so unpopular combine to make the entire debacle suspect.
  - paulbaumgart 17y ago
    I haven't driven any newer Toyotas, but do they not let you turn off the ignition while in motion/gear?
    - baguasquirrel 17y ago
      You can, but then it's stuck in drive/neutral. Seeing that the brakes and neutral are still operable, it should not be an issue. I don't even know why people are being advised to turn off the ignition. Shifting to neutral while braking reduces the load on the engine.
      - paulbaumgart 17y ago
        Wouldn't shifting to neutral make the engine rev up really high? Does the computer limit the RPMs to prevent damage?
        anamax 17y ago
        > Wouldn't shifting to neutral make the engine rev up really high? Does the computer limit the RPMs to prevent damage? Yes, the computers do. However, if you're going to have an accident, engine damage is pretty low on the list of concerns, even if you ignore the fact that accidents cause engine damage.
apsec112 17y ago
See the Great Seattle Windshield Pitting Epidemic: http://en.wikipedia.org/wiki/Seattle_Windshield_Pitting_Epidemic http://en.wikipedia.org/wiki/Seattle_Windshield_Pitting_Epid...
timtadh 17y ago
This is definitely a witch hunt. The same thing happened in my ford truck when I misplaced the mat after cleaning it. I simply turned the car off put the clutch in and coasted to a stop at the edge of the highway and fixed the mat. From the reports this sounds like the exact situation for the Toyota cars. From my perspective nothing is wrong with the cars and the whole thing is way overblown.
- jonknee 17y ago
  Many of the Toyota problems had nothing to do with the mats--they are drive by wire and the computer was slammed on the gas without the pedal being depressed. Depending on when this occurs it could be deadly even with an expert driver.
  - cryptnoob 17y ago
    Please forward your proof of this to Toyota and the congressional committee to which Toyota swore this was not the case. It's tempting to blame drive by wire, since electronics is black magic to most people. Keep in mind that most passenger jets in the sky are fly by wire, these days. For you to point blank claim this to be true, when it's been flatly denied several times, seems a bit over the top, don't you think?
    - lallysingh 17y ago
      Really? I think it was an article here (maybe, maybe not, I'm pretty hung over today) that mentioned that the problem was that the primary and backup pedal position sensors' wires could short and max out.
      - cryptnoob 17y ago
        You usually design so that a single point of failure can't hurt you. If one position sensor (they use pots, since they're practically indestructable and not vulnerable to ESD, power transients, etc) fails, you sense the problem with the other sensor. They're not "primary and backup", they're both equally important. You postulate that both sensors short out at the exact same instant, since any other scenario would power down the vehicle. They did it within milliseconds of each other, and they did it at some intermediate, yet believable level. (They didn't "peg at maximum", as that would also alert the software there was a problem. Instead they pegged, identically, at some believable value. I'll take the other side of that bet any day.
deleted 17y ago
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old-gregg 17y ago
"Every man, woman, and child in the U.S. has approximately a one-in-8000 chance of perishing in a car accident every year. Over a decade, that's about one in 800. Given the millions of cars included in the Toyota recalls and the fewer than 20 alleged deaths over the past decade, the alleged fatality rate is about one death per 200,000 recalled Toyotas. Even if all the alleged deaths really are resultant from vehicle defects—highly unlikely—and even if all the worst things people are speculating about Toyotas are true, and you're driving one, and you aren't smart or calm enough to shift to neutral if the thing surges, you're still approximately 250 times likelier to die in one of these cars for reasons having nothing to do with unintended acceleration. So if you can muster the courage to get into a car and drive, the additional alleged risk of driving a Toyota is virtually negligible..." The rest is in the C&D article referenced, I believe, by the author: http://www.caranddriver.com/news/car/10q1/toyota_recall_scandal_media_circus_and_stupid_drivers-editorial http://www.caranddriver.com/news/car/10q1/toyota_recall_scan...
- mturmon 17y ago
  The C&D article (and the ones it points to about their road test) is really good. Because there are more people talking about this than actually know anything. Including in this thread. The C&D article does leave the door open to the possibility of the brakes not stopping the car. If you pump the brakes, rather than firmly putting them down once, you may lose vacuum, or overheat the brakes in a series of "slow down a little" steps. The vacuum is apparently hard to replenish when the throttle is open. The advice about turning the car off works sometimes, but not always. Suppose you're in a rental Lexus like the one the CA state trooper died in. Would you know that to kill the engine, you have to depress the off button for 3 seconds continuously? Three seconds is a long time with the throttle wide open. It seems the key technical mistake on Toyota's part, as pointed out in the C&D article, is to omit an interlock that kills the throttle when the brake is depressed. This is apparently standard on many other cars. Toyota's damage control on this has been disastrous.
dustingetz 17y ago
jeez, the tone of that article is absolutely absurd.
stcredzero 17y ago
The Mythbusters tried to slam a car into reverse at speed. What they discovered, is that there are safety mechanisms to prevent this from happening in automatics. http://mythbustersresults.com/episode84 http://mythbustersresults.com/episode84
- kelnos 17y ago
  Not just automatics... my manual (2004 Honda) has an interlock that blocks the shifter from moving into reverse if I'm moving forward at > 10mph.
waivej 17y ago
I bet there is a mechanical/electrical issue that is blown way out of proportion, and human error in some of these issues. Once I accidentally slammed on the gas thinking it was the brake. (I got confused switching from a manual transmission to an automatic.) It was scary...the car jumped a curb and my driver's ed teacher was furious. He slammed his brake and it stopped the car.
- vaksel 17y ago
  that's how I failed my first driver's test. Was reversing into a spot, and hit gas instead of brakes.
zzzmarcus 17y ago
Can someone explain to me why Congress gets involved in investigating things like Toyota's manufacturing defects or the way college football teams are ranked? Does Congress have a legal mandate to investigate anything it deems to be interesting/fishy/a potential target for legislation? Has Congress always conducted these types of investigations or is it a modern phenomenon?
- idoh 17y ago
  Don't hate the players, hate the game. They do what they do to get reelected.
  - MikeCapone 17y ago
    I'm pretty sure I can still hate the players.
- whyenot 17y ago
  cynic: Congress' mandate is to investigate anything that will get votes, or campaign funds. Wikipedia: Investigative hearings share some of the characteristics of legislative and oversight hearings. The difference lies in Congress’s stated determination to investigate, usually when there is a suspicion of wrongdoing on the part of public officials acting in their official capacity, or private citizens whose activities suggest the need for a legislative remedy. Congress’s authority to investigate is broad and it has exercised this authority since the earliest days of the republic. Its most famous inquiries are benchmarks in American history: Credit Mobilier, Teapot Dome, Army-McCarthy, Watergate, and Iran-Contra. Investigative hearings often lead to legislation to address the problems uncovered. Judicial activities in the same area of Congress’s investigation may precede, run simultaneously with, or follow such inquiries. It's not a recent phenomenon at all. For example, the Crédit Mobilier hearings were in 1872.
  - zzzmarcus 17y ago
    Thanks for the answer. The difference is that the scandals in the Wikipedia article all directly involve government: Credit Mobilier: "The distribution of Crédit Mobilier stocks by Congressman Oakes Ames along with cash bribes to congressmen" Teapot Dome: "control of U.S. Navy petroleum reserves at Teapot Dome in Wyoming and at Elk Hills and Buena Vista in California, were transferred from the U.S. Navy Department to the Department of the Interior" And Army-McCarthy, Watergate and Iran-Contra are all obviously directly tied to the government. In those cases it makes sense for Congress to get involved. It's when Congress start to investigate "private citizens whose activities suggest the needs for legislative remedy" that I get concerned. That type of broad power apparently gives them free-reign to investigate anything they don't like. It seems to me that in the past (15 or 20+ years ago) Congress didn't get involved in non-government related "scandals" like Toyota and college football, I'd be interested if anyone has examples to the contrary.
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johngalt 17y ago
Perfect time to buy a Toyota, also I'd evaluate Toyota stock.
- skushch 17y ago
  It would be very difficult to evaluate Toyota stock. This kind of media events can warp public opinion about a company for a long time. I think it would be very hard to put number to this. I would bet that even if tomorrow the government comes out and says "oops, my bad, everything is fine" you wouldn't see a sudden reversal.
stcredzero 17y ago
If Congress really wanted to get at the truth, they should have called disinterested third-party engineers to study and get their opinion on this case. Nobody believes Toyota, even if the final facts prove it's correct. Everyone believes the witnesses, even when the engineering evidence often disproves their testimony. It is impossible to come to a scientifically valid conclusion under those two circumstances, which is why many individuals involved in this issue have described the proceedings as "witch hunts." Actual American political debate hardly happens anymore. What we have now is theater. The mentality of the LCD American voter is simply abysmal. You can see it from the low or sloppy intellectual content of the "product" which is presented to them by politicians, journalists, and other media workers.
- philwelch 17y ago
  "the LCD American voter..." Heh, that works on two levels--not just "lowest common denominator" but also the American voter who watches too much TV news on their LCD HDTV.
barmstrong 17y ago
I had the exact same reaction when I saw this.."congress? why is congress getting involved in this?" If people are upset with how their Toyota cars are operating, then no one stands to lose more than the Toyota company itself in lost revenue. So what additional incentive or pressure could congress apply here except increased publicity? Let's see...we lose a billion dollars, or get chewed out by some old guys for a few hours, which sounds worse? It seems really silly to watch politicians chastise a CEO and talk down to him. Good engineering (especially on a massive scale like that) is really hard. If they think they can do better then no one is stopping them (members of congress) from starting their own car company to try and compete. Otherwise, I'm not sure why they feel qualified to criticize. Something else that bugged me is the quote from one of the witnesses which said 'Shame on you Toyota for being so greedy'. So...you're saying they intentionally pissed off all their customers as some sort of plan to make more money? I'm so confused by this mentality people have that greed in corporations is a bad thing. Yes, you could argue they sacrificed long term quality for a short term savings, but this is hardly greedy, it's just bad business practice that leaves you with LESS money. This may be unrealistic, but I really wanted to see the Toyota CEO reply to congress with some sort of statement like, "We won't be appearing at any hearings. We are a private company and don't answer to government. We only answer to our customers. So if any of our customers have questions here is a toll free hotline. Members of congress, if you are a Toyota customer, feel free to call as well, but you're role in government won't be taken into account in how we respond."
psranga 17y ago
Any comments on this article? This auto professor is able to reproduce the problem. http://www.leftlanenews.com/report-toyota-electronics-design-flaw-causes-sudden-acceleration-video.html http://www.leftlanenews.com/report-toyota-electronics-design... This is what the article says about the prof: Instead, we were treated to Dr. David Gilbert of Southern Illinois University, also a guest of Mr. Kane's, who claimed to have found how Toyota's electronic system could totally malfunction, creating a runaway car—and claimed he'd found the error in less than four hours. Spoiler alert: Dr. Gilbert was assigned this work by Kane's safety advocacy firm, with at least partial funding by trial lawyers. Here, too, is a problem: Dr. Gilbert said he relayed the results of that test and his concerns directly to Toyota. In short order Toyota looked into Dr. Gilbert's claims and found them not to be valid in terms of creating unintended acceleration. Then, to the company's surprise, it watched his appearance with Brian Ross on ABC News this past Monday night, Feb. 22. According to Toyota, it now appears that Dr. Gilbert had done something completely different in order to get a Toyota Avalon to accelerate under its own power. Toyota offered to evaluate Dr. Gilbert's Avalon, with ABC in attendance, and see what he did electronically to cause it to accelerate. Additionally, Toyota is fairly adamant that Gilbert's "test evaluation" on ABC News was not the original "discovery" he relayed to them on Feb. 16.
- illumin8 17y ago
  The professor apparently hooked up an "external bypass device" to a brand new Toyota Avalon, and then complains that the computer should sense the artificial short he introduced into the system and disable the acceleration system. Hardly the most reliable test.
yaroslavvb 17y ago
Sudden acceleration complaints by year/make http://www.npr.org/templates/story/story.php?storyId=124235858 http://www.npr.org/templates/story/story.php?storyId=1242358... For model year 2009, Volkswagen had 11.5 complaints per 100k vehicles, whereas Toyota had 7.5 and BMW 5.8
jellicle 17y ago
"As noted before, brakes always win out over engines, even at full throttle; that has been tested and proved many times in the past 20 years, including recent Car and Driver tests on Toyotas." This is not necessarily true. It's entirely dependent on the brakes involved and the engine involved; any given vehicle could go either way. I personally have witnessed steel brake rotors melted and dripping off the vehicle; the brakes had locked up at highway speed and the driver had continued driving, reporting afterwards that the vehicle seemed a little sluggish but not excessively so, so he hadn't stopped. For that vehicle: the brakes lost. For other vehicles, perhaps ones with dinky engines and big fat brakes: the brakes may win. It's certainly not the sort of thing where one can say "brakes always win". Car and Driver's article ( http://www.caranddriver.com/features/09q4/how_to_deal_with_unintended_acceleration-tech_dept http://www.caranddriver.com/features/09q4/how_to_deal_with_u... ) seems to assume that Toyotas don't cut the engine power when the brakes are applied, but their own tests belie that. I would guess that Toyota's software cuts the power LESS than the competition's software does. But if you're stopping from 70mph with and without the throttle at full, and you notice a minimal difference - as C&D did - I can guarantee you that the throttle is being reduced when the brakes are applied. Maybe not to zero, but reduced.
- phaedrus 17y ago
  Absolutely. I used to own a V-8 Ford pickup; if you happened to hit the brakes and the gas at the same time the power of the engine would completely overwhelm the brakes and the truck would (start to or continue to) move. If you accidently left the parking brake on, you couldn't discern a difference while driving it. Coming from a state where many people own pickup trucks, I was taught that the engine will overpower the brakes, every time. Now I own a small car with exceptional brakes that I'm sure would stop in that situation, but that's just the exception that proves the rule - it depends on how big your engine is.
deleted 17y ago
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sliverstorm 17y ago
By the way, just in case it ever helps anyone: If you are in a car moving along and you have to kill the engine, or the engine dies, get on the brakes as fast as you can and don't let go. You can ease up on the brakes almost to the point of letting go of the pedal, but don't come off all the way. The reason is the brakes will maintain the power-assist vacuum from the engine, even when the engine is later switched off, until they are released completely. The 'power-assist' strength will remain for tens of seconds, at least. I've tried this many times before. I can't guarantee it works on modern cars, but it sure did work on my '86 Toyota with standard hydraulic vacuum-assist brakes.
- phaedrus 17y ago
  I can't see why that would be necessary. The vacuum assist is just that - an assist. The brakes still work if you don't have it, you just have to put some extra force on the pedal. It isn't even that much force; I've driven older vehicles that don't have any assist at all and it's not that much harder to push the pedal.
snom370 17y ago
While I agree that the media and politicians are now feasting on Toyotas failures, the fact is that Toyota really botched this. Had they taken the reports seriously earlier none of this would have happened, and lives could have been spared. Apparently they never thought this story could spiral out of control. People seem to forget that this only happened until after Toyota had repeated recalls, each promising to fix the problem. Is there a ghost in the machine? I don't know, Woz certainly seems to think so. Replacing floor mats and then gas pedals seems awfully like what happened with the Therac 25 radiation overdoses in the 80s. (The Therac 25 manufacturer first added an extra hardware switch to the radiation therapy machine and claimed it was "an order of magnitude safer". When more people died, the quick emergency fix was to remove the "up" button from the VT100 console.)
peterarmstrong 17y ago
It may be a witch hunt, but I have a 2008 Prius that has had a number of issues with brakes after potholes etc -- going for about one second without having much effect. It has happened to me once when I went over a pothole and my wife a number of times (she drives more). I'm in Canada and my local dealer can't reproduce the problem yet, but put yourself in the position of a Toyota owner who is no longer confident in being safe and who would get less than half the purchase price for a car with < 70,000 KM on it. The Honda dealer doesn't want Toyotas as tradeins; they can't sell them. Can you feel the anger? I don't want to have to buy another car; I want to work on my startup. But I don't want to worry about my family's safety or buying some used car. Toyota should be forced to buy back their crap products at some reasonable percentage, since these problems remind me of "heisenbugs" in code...
- peterarmstrong 17y ago
  Or to put it more succinctly: just because there are stupid and/or dishonest people complaining about bugs in a product does NOT mean there are no bugs in said product or that all claims are baseless. I would bet any sample of 3000 complaints about the Ford Pinto or any product had at least some stupid and some dishonest ones.
jsz0 17y ago
It's times like this I feel like someone needs to tell the American people to grow up and stop acting like scared children. They're so easily manipulated by simple fear tactics. Automobiles are incredibly dangerous simply due to the drivers behind the wheel. Design flaws are the least of your worries. We can't seem to muster the same type of concentrated rage against drunk drivers, texting drivers, or any other impairments that make automobiles less safe. We can't even make laws that make automobiles safer by design. Why aren't side air bags a requirement? or roof air bags? More frequent safety inspections? Bad tires or worn out windshield wipers are so much more dangerous than the statistical improbability of a stuck throttle. It really makes me incredibly angry how capable Americans are of ignoring big problems and focusing on the tiny ones instead. We're doomed as a country if this mindset doesn't change and I'm not sure we don't deserve it.
mistermann 17y ago
I believe two things related to this: 1. to a certain degree, the US is punishing Japan due to their recent actions in the bond markets. This is a very important problem for a very small amount of people, but it makes great headlines. Do you think the US government is genuinely interested in resolving this properly from an engineering perspective? 2. that 100% "drive by wire" systems should not be allowed...there should be a big red "holy shit" kill switch on the dash of modern cars that kills power to everything except steering and brakes So, imho, its a very serious problem, that affects very few people (in the big scheme of things), and there is a very simple solution, for going forward technology at least, if not existing models. But do you guys get the feeling that this is what the conversation is actually about? Something seems a bit odd to me. But then I'm one of those conspiracy theorists that think when you're running 15% budget deficits and have real (as measured using historical methods) unemployment of 20%, and many bond issues are taken down 50% by the federal reserve (literally printing money to buy your own debt), that you will start to observe unusual things happening in the marketplace. The adherents of Occam's Razor would imply that that I am simply crazy, becasue the simplest answer is always the correct answer. So I guess thats it.
mcburton 17y ago
finally got around to creating a HN account. IMHO "unintended acceleration" is the penis panic of the west.

149 points by gyeh 17y ago

Wow. A wonderful article. The real question is, just how in-control is the computer. And how much has to go wrong such that uncontrollable acceleration happens and nothing can override that acceleration such that no matter what you do the computer makes the car go into "drive" and accelerate to the max, without responding to other parts of the system like the breaks and such.

kolosy 17y ago
short answer - the brake system has to suffer a mechanical failure. read the part where "brakes always win over engines".
- deleted 17y ago
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sliverstorm 17y ago
The accelerator pedal would have to be immovable, frozen in place. The ignition switch would have to lock or otherwise malfunction The shift lever or clutch or automatic shift lever would have to malfunction The brakes would have to overheat (does not really happen much in a production car). It is not 100% true that brakes will always overpower the engine, but the cases in which they don't are the ones with massive 700hp engines with big 'ol turbos and stock drum brakes, and in that situation it's the owner's responsibility. There would also have to be no runaway truck exits. If you were creative and knew something about cars, you could pull one of many fuses from the fuse box. On cars I've serviced, the computer fuse is always in the driver kick panel, so just rip off that panel and start yanking fuses while watching the road. It should be noted that the e-brake on fwd cars is not your best choice (though still a decent choice); while a locked up wheel provides drag, it does not apply as much drag as a rolling wheel with maximum braking (which can easily be obtained cause of ABS). Also at extreme speeds you run the risk of a spin, which puts you possibly at risk for a roll.
- lanstein 17y ago
  There is about a .000000001% chance you just saved my life. Thank you. (edited math)
- jonknee 17y ago
  > The accelerator pedal would have to be immovable, frozen in place. In recent Toyota vehicles the pedal isn't connected to the throttle--it's drive by wire. In theory the computer could continue accelerating regardless of the gas pedal's position.
  - cryptnoob 17y ago
    I've designed systems like this. You use redundant potentiometers to sense throttle position. If they don't match within 5%, you power down. You also toggle bits in your code. One in the main loop, another in any interrupt service routine that you are dependent upon. These bits then go to a GPIO so that the GPIO toggles. If the ISR freezes or the main loop freezes, the GPIO quits toggling. You then have an hardware, RC-Diode type circuit, that stays high if it's input toggles, but goes low, if it's input goes low and stays low, or goes high and stays high. The output of this circuit drives a relay, so that if the CPU quits toggling the GPIO, the relay clicks off. The output of that relay is a dead-man's switch that powers down the vehicle. The end result is a hardware fail-safe if the CPU misbehaves. There are other tests to confirm that the relay isn't frozen, that the RC-Diode circuit isn't frozen, etc. So, in theory, if a high-school sophomore designed the vehicle, you might have a problem. Otherwise, I think you don't give the engineers that design these systems enough credit.
    - jonknee 17y ago
      ... And yet there are out of control cars without the pedal being stuck. "Well, I have many models of Prius that got recalled, but I have a new model that didn't get recalled. This new model has an accelerator that goes wild, but only under certain conditions of cruise control. And I can repeat it over and over and over again--safely." "This is software. It's not a bad accelerator pedal. It's very scary, but luckily for me, I can hit the brakes," he said. -- Steve Wozniak http://news.cnet.com/8301-13924_3-10445564-64.html http://news.cnet.com/8301-13924_3-10445564-64.html

sliverstorm 17y ago

Thank god! I have heard only from people who buy into the witch hunt (and an excellent name for it, that is). I am really very glad to see I'm not the only person who realizes most of it is ridiculous and overblown. Hell, even if the gas pedal corroded AND the floor mat held it down, has not one of these drivers even though to reach down and PULL the goddamn thing up? I pray people realize this is folly... I don't know what we're gonna do if stupidity brings down the pillar of the auto industry, through no fault of it's own.

kolosy 17y ago
see audi circa 1987. http://en.wikipedia.org/wiki/Audi#Reported_sudden_unintended_acceleration http://en.wikipedia.org/wiki/Audi#Reported_sudden_unintended...
tome 17y ago
Witch hunt is a great word. When I watched a CNN clip of one woman giving evidence about her "broken" Lexus I felt a very strong analogue to Arthur Miller's The Crucible.
mediaman 17y ago
I don't disagree that this has been overblown, but in fairness it would be fairly difficult to reach down and pull the gas pedal up while the engine is raging and the vehicle is undergoing significant forward acceleration, while the driver is presumably trying to avoid colliding into other vehicles and objects. Of course, they should just shift it to neutral and let it redline.
- sliverstorm 17y ago
  Yes to the second part as for the first part, doesn't have to be your hand. Depending on the vehicle, you might be able to get your toe under the pedal.

Splines 17y ago

This whole Toyota debacle makes me wonder if competing car companies buy cars made by other manufacturers and poke at them in the hopes of having something just like this happen.

mahmud 17y ago
The risk of being caught doing that is grounds for bankruptcy and life sentences.

erlanger 17y ago

I hold the conspiracy theory that these issues are being so aggressively sought out in an attempt to bring Toyota's image down to the level of American auto manufacturers.

presidentender 17y ago
I wholeheartedly agree. The sheer number of failures that have to occur, the low level of action on the drivers' parts required to overcome the problem (put it in neutral! Use your brakes! Use your parking brakes!), the speed and intensity of the government's response, and the fact that GM is so unpopular combine to make the entire debacle suspect.
- paulbaumgart 17y ago
  I haven't driven any newer Toyotas, but do they not let you turn off the ignition while in motion/gear?
  - baguasquirrel 17y ago
    You can, but then it's stuck in drive/neutral. Seeing that the brakes and neutral are still operable, it should not be an issue. I don't even know why people are being advised to turn off the ignition. Shifting to neutral while braking reduces the load on the engine.
    - paulbaumgart 17y ago
      Wouldn't shifting to neutral make the engine rev up really high? Does the computer limit the RPMs to prevent damage?
      - anamax 17y ago
        > Wouldn't shifting to neutral make the engine rev up really high? Does the computer limit the RPMs to prevent damage? Yes, the computers do. However, if you're going to have an accident, engine damage is pretty low on the list of concerns, even if you ignore the fact that accidents cause engine damage.

apsec112 17y ago

See the Great Seattle Windshield Pitting Epidemic: http://en.wikipedia.org/wiki/Seattle_Windshield_Pitting_Epidemic http://en.wikipedia.org/wiki/Seattle_Windshield_Pitting_Epid...

timtadh 17y ago

This is definitely a witch hunt. The same thing happened in my ford truck when I misplaced the mat after cleaning it. I simply turned the car off put the clutch in and coasted to a stop at the edge of the highway and fixed the mat. From the reports this sounds like the exact situation for the Toyota cars. From my perspective nothing is wrong with the cars and the whole thing is way overblown.

jonknee 17y ago
Many of the Toyota problems had nothing to do with the mats--they are drive by wire and the computer was slammed on the gas without the pedal being depressed. Depending on when this occurs it could be deadly even with an expert driver.
- cryptnoob 17y ago
  Please forward your proof of this to Toyota and the congressional committee to which Toyota swore this was not the case. It's tempting to blame drive by wire, since electronics is black magic to most people. Keep in mind that most passenger jets in the sky are fly by wire, these days. For you to point blank claim this to be true, when it's been flatly denied several times, seems a bit over the top, don't you think?
  - lallysingh 17y ago
    Really? I think it was an article here (maybe, maybe not, I'm pretty hung over today) that mentioned that the problem was that the primary and backup pedal position sensors' wires could short and max out.
    - cryptnoob 17y ago
      You usually design so that a single point of failure can't hurt you. If one position sensor (they use pots, since they're practically indestructable and not vulnerable to ESD, power transients, etc) fails, you sense the problem with the other sensor. They're not "primary and backup", they're both equally important. You postulate that both sensors short out at the exact same instant, since any other scenario would power down the vehicle. They did it within milliseconds of each other, and they did it at some intermediate, yet believable level. (They didn't "peg at maximum", as that would also alert the software there was a problem. Instead they pegged, identically, at some believable value. I'll take the other side of that bet any day.

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old-gregg 17y ago

"Every man, woman, and child in the U.S. has approximately a one-in-8000 chance of perishing in a car accident every year. Over a decade, that's about one in 800. Given the millions of cars included in the Toyota recalls and the fewer than 20 alleged deaths over the past decade, the alleged fatality rate is about one death per 200,000 recalled Toyotas. Even if all the alleged deaths really are resultant from vehicle defects—highly unlikely—and even if all the worst things people are speculating about Toyotas are true, and you're driving one, and you aren't smart or calm enough to shift to neutral if the thing surges, you're still approximately 250 times likelier to die in one of these cars for reasons having nothing to do with unintended acceleration. So if you can muster the courage to get into a car and drive, the additional alleged risk of driving a Toyota is virtually negligible..." The rest is in the C&D article referenced, I believe, by the author: http://www.caranddriver.com/news/car/10q1/toyota_recall_scandal_media_circus_and_stupid_drivers-editorial http://www.caranddriver.com/news/car/10q1/toyota_recall_scan...

mturmon 17y ago
The C&D article (and the ones it points to about their road test) is really good. Because there are more people talking about this than actually know anything. Including in this thread. The C&D article does leave the door open to the possibility of the brakes not stopping the car. If you pump the brakes, rather than firmly putting them down once, you may lose vacuum, or overheat the brakes in a series of "slow down a little" steps. The vacuum is apparently hard to replenish when the throttle is open. The advice about turning the car off works sometimes, but not always. Suppose you're in a rental Lexus like the one the CA state trooper died in. Would you know that to kill the engine, you have to depress the off button for 3 seconds continuously? Three seconds is a long time with the throttle wide open. It seems the key technical mistake on Toyota's part, as pointed out in the C&D article, is to omit an interlock that kills the throttle when the brake is depressed. This is apparently standard on many other cars. Toyota's damage control on this has been disastrous.

dustingetz 17y ago

jeez, the tone of that article is absolutely absurd.

stcredzero 17y ago

The Mythbusters tried to slam a car into reverse at speed. What they discovered, is that there are safety mechanisms to prevent this from happening in automatics. http://mythbustersresults.com/episode84 http://mythbustersresults.com/episode84

kelnos 17y ago
Not just automatics... my manual (2004 Honda) has an interlock that blocks the shifter from moving into reverse if I'm moving forward at > 10mph.

waivej 17y ago

I bet there is a mechanical/electrical issue that is blown way out of proportion, and human error in some of these issues. Once I accidentally slammed on the gas thinking it was the brake. (I got confused switching from a manual transmission to an automatic.) It was scary...the car jumped a curb and my driver's ed teacher was furious. He slammed his brake and it stopped the car.

vaksel 17y ago
that's how I failed my first driver's test. Was reversing into a spot, and hit gas instead of brakes.

zzzmarcus 17y ago

Can someone explain to me why Congress gets involved in investigating things like Toyota's manufacturing defects or the way college football teams are ranked? Does Congress have a legal mandate to investigate anything it deems to be interesting/fishy/a potential target for legislation? Has Congress always conducted these types of investigations or is it a modern phenomenon?

idoh 17y ago
Don't hate the players, hate the game. They do what they do to get reelected.
- MikeCapone 17y ago
  I'm pretty sure I can still hate the players.
whyenot 17y ago
cynic: Congress' mandate is to investigate anything that will get votes, or campaign funds. Wikipedia: Investigative hearings share some of the characteristics of legislative and oversight hearings. The difference lies in Congress’s stated determination to investigate, usually when there is a suspicion of wrongdoing on the part of public officials acting in their official capacity, or private citizens whose activities suggest the need for a legislative remedy. Congress’s authority to investigate is broad and it has exercised this authority since the earliest days of the republic. Its most famous inquiries are benchmarks in American history: Credit Mobilier, Teapot Dome, Army-McCarthy, Watergate, and Iran-Contra. Investigative hearings often lead to legislation to address the problems uncovered. Judicial activities in the same area of Congress’s investigation may precede, run simultaneously with, or follow such inquiries. It's not a recent phenomenon at all. For example, the Crédit Mobilier hearings were in 1872.
- zzzmarcus 17y ago
  Thanks for the answer. The difference is that the scandals in the Wikipedia article all directly involve government: Credit Mobilier: "The distribution of Crédit Mobilier stocks by Congressman Oakes Ames along with cash bribes to congressmen" Teapot Dome: "control of U.S. Navy petroleum reserves at Teapot Dome in Wyoming and at Elk Hills and Buena Vista in California, were transferred from the U.S. Navy Department to the Department of the Interior" And Army-McCarthy, Watergate and Iran-Contra are all obviously directly tied to the government. In those cases it makes sense for Congress to get involved. It's when Congress start to investigate "private citizens whose activities suggest the needs for legislative remedy" that I get concerned. That type of broad power apparently gives them free-reign to investigate anything they don't like. It seems to me that in the past (15 or 20+ years ago) Congress didn't get involved in non-government related "scandals" like Toyota and college football, I'd be interested if anyone has examples to the contrary.

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johngalt 17y ago

Perfect time to buy a Toyota, also I'd evaluate Toyota stock.

skushch 17y ago
It would be very difficult to evaluate Toyota stock. This kind of media events can warp public opinion about a company for a long time. I think it would be very hard to put number to this. I would bet that even if tomorrow the government comes out and says "oops, my bad, everything is fine" you wouldn't see a sudden reversal.

stcredzero 17y ago

If Congress really wanted to get at the truth, they should have called disinterested third-party engineers to study and get their opinion on this case. Nobody believes Toyota, even if the final facts prove it's correct. Everyone believes the witnesses, even when the engineering evidence often disproves their testimony. It is impossible to come to a scientifically valid conclusion under those two circumstances, which is why many individuals involved in this issue have described the proceedings as "witch hunts." Actual American political debate hardly happens anymore. What we have now is theater. The mentality of the LCD American voter is simply abysmal. You can see it from the low or sloppy intellectual content of the "product" which is presented to them by politicians, journalists, and other media workers.

philwelch 17y ago
"the LCD American voter..." Heh, that works on two levels--not just "lowest common denominator" but also the American voter who watches too much TV news on their LCD HDTV.

barmstrong 17y ago

I had the exact same reaction when I saw this.."congress? why is congress getting involved in this?" If people are upset with how their Toyota cars are operating, then no one stands to lose more than the Toyota company itself in lost revenue. So what additional incentive or pressure could congress apply here except increased publicity? Let's see...we lose a billion dollars, or get chewed out by some old guys for a few hours, which sounds worse? It seems really silly to watch politicians chastise a CEO and talk down to him. Good engineering (especially on a massive scale like that) is really hard. If they think they can do better then no one is stopping them (members of congress) from starting their own car company to try and compete. Otherwise, I'm not sure why they feel qualified to criticize. Something else that bugged me is the quote from one of the witnesses which said 'Shame on you Toyota for being so greedy'. So...you're saying they intentionally pissed off all their customers as some sort of plan to make more money? I'm so confused by this mentality people have that greed in corporations is a bad thing. Yes, you could argue they sacrificed long term quality for a short term savings, but this is hardly greedy, it's just bad business practice that leaves you with LESS money. This may be unrealistic, but I really wanted to see the Toyota CEO reply to congress with some sort of statement like, "We won't be appearing at any hearings. We are a private company and don't answer to government. We only answer to our customers. So if any of our customers have questions here is a toll free hotline. Members of congress, if you are a Toyota customer, feel free to call as well, but you're role in government won't be taken into account in how we respond."

psranga 17y ago

Any comments on this article? This auto professor is able to reproduce the problem. http://www.leftlanenews.com/report-toyota-electronics-design-flaw-causes-sudden-acceleration-video.html http://www.leftlanenews.com/report-toyota-electronics-design... This is what the article says about the prof: Instead, we were treated to Dr. David Gilbert of Southern Illinois University, also a guest of Mr. Kane's, who claimed to have found how Toyota's electronic system could totally malfunction, creating a runaway car—and claimed he'd found the error in less than four hours. Spoiler alert: Dr. Gilbert was assigned this work by Kane's safety advocacy firm, with at least partial funding by trial lawyers. Here, too, is a problem: Dr. Gilbert said he relayed the results of that test and his concerns directly to Toyota. In short order Toyota looked into Dr. Gilbert's claims and found them not to be valid in terms of creating unintended acceleration. Then, to the company's surprise, it watched his appearance with Brian Ross on ABC News this past Monday night, Feb. 22. According to Toyota, it now appears that Dr. Gilbert had done something completely different in order to get a Toyota Avalon to accelerate under its own power. Toyota offered to evaluate Dr. Gilbert's Avalon, with ABC in attendance, and see what he did electronically to cause it to accelerate. Additionally, Toyota is fairly adamant that Gilbert's "test evaluation" on ABC News was not the original "discovery" he relayed to them on Feb. 16.

illumin8 17y ago
The professor apparently hooked up an "external bypass device" to a brand new Toyota Avalon, and then complains that the computer should sense the artificial short he introduced into the system and disable the acceleration system. Hardly the most reliable test.

yaroslavvb 17y ago

Sudden acceleration complaints by year/make http://www.npr.org/templates/story/story.php?storyId=124235858 http://www.npr.org/templates/story/story.php?storyId=1242358... For model year 2009, Volkswagen had 11.5 complaints per 100k vehicles, whereas Toyota had 7.5 and BMW 5.8

jellicle 17y ago

"As noted before, brakes always win out over engines, even at full throttle; that has been tested and proved many times in the past 20 years, including recent Car and Driver tests on Toyotas." This is not necessarily true. It's entirely dependent on the brakes involved and the engine involved; any given vehicle could go either way. I personally have witnessed steel brake rotors melted and dripping off the vehicle; the brakes had locked up at highway speed and the driver had continued driving, reporting afterwards that the vehicle seemed a little sluggish but not excessively so, so he hadn't stopped. For that vehicle: the brakes lost. For other vehicles, perhaps ones with dinky engines and big fat brakes: the brakes may win. It's certainly not the sort of thing where one can say "brakes always win". Car and Driver's article ( http://www.caranddriver.com/features/09q4/how_to_deal_with_unintended_acceleration-tech_dept http://www.caranddriver.com/features/09q4/how_to_deal_with_u... ) seems to assume that Toyotas don't cut the engine power when the brakes are applied, but their own tests belie that. I would guess that Toyota's software cuts the power LESS than the competition's software does. But if you're stopping from 70mph with and without the throttle at full, and you notice a minimal difference - as C&D did - I can guarantee you that the throttle is being reduced when the brakes are applied. Maybe not to zero, but reduced.

phaedrus 17y ago
Absolutely. I used to own a V-8 Ford pickup; if you happened to hit the brakes and the gas at the same time the power of the engine would completely overwhelm the brakes and the truck would (start to or continue to) move. If you accidently left the parking brake on, you couldn't discern a difference while driving it. Coming from a state where many people own pickup trucks, I was taught that the engine will overpower the brakes, every time. Now I own a small car with exceptional brakes that I'm sure would stop in that situation, but that's just the exception that proves the rule - it depends on how big your engine is.

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sliverstorm 17y ago

By the way, just in case it ever helps anyone: If you are in a car moving along and you have to kill the engine, or the engine dies, get on the brakes as fast as you can and don't let go. You can ease up on the brakes almost to the point of letting go of the pedal, but don't come off all the way. The reason is the brakes will maintain the power-assist vacuum from the engine, even when the engine is later switched off, until they are released completely. The 'power-assist' strength will remain for tens of seconds, at least. I've tried this many times before. I can't guarantee it works on modern cars, but it sure did work on my '86 Toyota with standard hydraulic vacuum-assist brakes.

phaedrus 17y ago
I can't see why that would be necessary. The vacuum assist is just that - an assist. The brakes still work if you don't have it, you just have to put some extra force on the pedal. It isn't even that much force; I've driven older vehicles that don't have any assist at all and it's not that much harder to push the pedal.

snom370 17y ago

While I agree that the media and politicians are now feasting on Toyotas failures, the fact is that Toyota really botched this. Had they taken the reports seriously earlier none of this would have happened, and lives could have been spared. Apparently they never thought this story could spiral out of control. People seem to forget that this only happened until after Toyota had repeated recalls, each promising to fix the problem. Is there a ghost in the machine? I don't know, Woz certainly seems to think so. Replacing floor mats and then gas pedals seems awfully like what happened with the Therac 25 radiation overdoses in the 80s. (The Therac 25 manufacturer first added an extra hardware switch to the radiation therapy machine and claimed it was "an order of magnitude safer". When more people died, the quick emergency fix was to remove the "up" button from the VT100 console.)

peterarmstrong 17y ago

It may be a witch hunt, but I have a 2008 Prius that has had a number of issues with brakes after potholes etc -- going for about one second without having much effect. It has happened to me once when I went over a pothole and my wife a number of times (she drives more). I'm in Canada and my local dealer can't reproduce the problem yet, but put yourself in the position of a Toyota owner who is no longer confident in being safe and who would get less than half the purchase price for a car with < 70,000 KM on it. The Honda dealer doesn't want Toyotas as tradeins; they can't sell them. Can you feel the anger? I don't want to have to buy another car; I want to work on my startup. But I don't want to worry about my family's safety or buying some used car. Toyota should be forced to buy back their crap products at some reasonable percentage, since these problems remind me of "heisenbugs" in code...

peterarmstrong 17y ago
Or to put it more succinctly: just because there are stupid and/or dishonest people complaining about bugs in a product does NOT mean there are no bugs in said product or that all claims are baseless. I would bet any sample of 3000 complaints about the Ford Pinto or any product had at least some stupid and some dishonest ones.

jsz0 17y ago

It's times like this I feel like someone needs to tell the American people to grow up and stop acting like scared children. They're so easily manipulated by simple fear tactics. Automobiles are incredibly dangerous simply due to the drivers behind the wheel. Design flaws are the least of your worries. We can't seem to muster the same type of concentrated rage against drunk drivers, texting drivers, or any other impairments that make automobiles less safe. We can't even make laws that make automobiles safer by design. Why aren't side air bags a requirement? or roof air bags? More frequent safety inspections? Bad tires or worn out windshield wipers are so much more dangerous than the statistical improbability of a stuck throttle. It really makes me incredibly angry how capable Americans are of ignoring big problems and focusing on the tiny ones instead. We're doomed as a country if this mindset doesn't change and I'm not sure we don't deserve it.

mistermann 17y ago

I believe two things related to this: 1. to a certain degree, the US is punishing Japan due to their recent actions in the bond markets. This is a very important problem for a very small amount of people, but it makes great headlines. Do you think the US government is genuinely interested in resolving this properly from an engineering perspective? 2. that 100% "drive by wire" systems should not be allowed...there should be a big red "holy shit" kill switch on the dash of modern cars that kills power to everything except steering and brakes So, imho, its a very serious problem, that affects very few people (in the big scheme of things), and there is a very simple solution, for going forward technology at least, if not existing models. But do you guys get the feeling that this is what the conversation is actually about? Something seems a bit odd to me. But then I'm one of those conspiracy theorists that think when you're running 15% budget deficits and have real (as measured using historical methods) unemployment of 20%, and many bond issues are taken down 50% by the federal reserve (literally printing money to buy your own debt), that you will start to observe unusual things happening in the marketplace. The adherents of Occam's Razor would imply that that I am simply crazy, becasue the simplest answer is always the correct answer. So I guess thats it.

mcburton 17y ago

finally got around to creating a HN account. IMHO "unintended acceleration" is the penis panic of the west.