Few automotive engineers believe in so-called "sudden acceleration". But until recently, there's been no way to determine what a driver what doing when he (or she) swears that he was pressing the brake pedal with all his strength even as the car accelerated.
Now, that's changed. Federal investigators say the latest highly publicized incident--in which a 2005 Toyota Prius in the New York City suburb of Harrison, NY, accelerated across a street and into a stone wall on March 9--appears to be the fault of the driver.
Black box: No brakes, full throttle
The Event Data Recorder, or "black box," in the Prius records at least several seconds of data from the car's electronic control systems. It was inspected by a team of six Toyota engineers and two officials from the National Highway Traffic Safety Administration (NHTSA).
The NHTSA said in a statement issued yesterday that the onboard computer systems in the Prius "indicated there was no application of the brakes, and the throttle was fully open."
In other words, the driver thought she was braking, but she wasn't--she was accelerating, with the pedal to the floor.
Noisy neurons
How can this happen? Richard Schmidt, a psychology professor at the University of California, Los Angeles, writes, "The trouble, unbelievable as it may seem, is that [it] is very often caused by drivers who press the gas pedal when they intend to press the brake."
He attributes this behavior to "noisy neuromuscular processes," when a limb doesn't quite do what the brain is telling it to do. So a driver's foot may deviate slightly from its intended path.
Older drivers, too?
Drivers who panic when a car accelerates when they expected it to brake immediately press even harder on the "brake" pedal--leading to further acceleration. Seemingly, this could explain what happened to the 56-year-old housekeeper who was driving the Prius.
Age may play a factor in the behavior as well, with the bulk of Toyota sudden acceleration complaints involving drivers aged 60 to 80.
Toyota fights back
Toyota publicized the NHTSA statement on its Harrison investigation, as it did the results of an earlier investigation into a San Diego incident. There, 61-year-old James Sikes claimed his 2008 Toyota Prius had sped out of control on a freeway for more than 20 minutes.
Toyota [NYSE:TM] issued a press release on Monday that pointed to "strong indications that the driver's account of the event is inconsistent with the findings of the preliminary analysis."
Black boxes to the rescue?
It may be black-box data, in fact, that exonerates carmakers from at least some of the blame for cases of so-called sudden acceleration. Back in the days of the notorious 1986 Audi sudden acceleration case, no data was recorded.
Shaken drivers often got a sympathetic treatment in the media, which tended to paint car manufacturers as selling hazardous products that jeopardized passengers' lives.
Black boxes standard in 2013
The NHTSA has finalized its rules governing Event Data Recorders, and they will be fitted to 2013-model-year vehicles, starting in September 2012. At that time, there will also be a requirement that owners can access their black boxes in some way.
In the end, the data may be what brings light into the confusion and darkness of these strange incidents. Stay tuned for much more to come on this topic.
[The Wall Street Journal (subscription may be required), Detroit News]
Have an opinion?
TimAllen Posted: 3/19/2010 1:26pm PDT
M. Funkibut Posted: 3/19/2010 1:36pm PDT
I can write that 2+2=5 all day long to a computer's HDD or to RAM or print it on any printer made.
That doesn't make it true.
If the computer is where the fault lies, do you really trust the data that the computer wrote to the black box? Really?
And then you let Toyota's engineers interpret the data for NHTSA? Really? How did you think that was gonna go? I wouldn't let a Toyota engineer ANYWHERE near a black box of an auto accident anymore than I would let a Delta employee fetch me the black box from a plane crash. Too much financial incentive to lie.
Strong evidence? Far from conclusive...
CB Posted: 3/19/2010 2:06pm PDT
Marc Posted: 3/19/2010 2:09pm PDT
Anon Posted: 3/19/2010 2:09pm PDT
Seriously,
GTFO.
SAFE DRIVER Posted: 3/19/2010 2:10pm PDT
jose cruz Posted: 3/19/2010 2:19pm PDT
John Posted: 3/19/2010 2:56pm PDT
Chip Posted: 3/19/2010 3:10pm PDT
John Cammerano Posted: 3/19/2010 3:12pm PDT
To Chip Posted: 3/19/2010 4:37pm PDT
Source: http://eastcountymagazine.org/taxonomy/term/3424
anonymous Posted: 3/19/2010 5:50pm PDT
emily Kitty Lover Posted: 3/19/2010 6:10pm PDT
http://www.star-telegram.com/2010/03/19/2052984/how-toyota-can-hurt-the-media.html
excerpt
That story was still running on CBS through its Up to the Minute news broadcast with Michelle Geilan at 4 a.m. the next morning. Only by then there was a serious problem with what they were reporting. Now CBS had aerial video of the stopped Prius behind the police cruiser. And, although the cruiser had reportedly gotten in front of Sikes' car and physically stopped it, the video showed no evidence of that interaction whatsoever on the front bumper of the Prius. No damage, not even a scratch.
Very good article about media toyota bashing.
Bob Posted: 3/19/2010 7:41pm PDT
On three separate occasions -- I thought it wasn't going to stop.
This 'sensation' of not stopping appears to be when your in battery mode and you hit the accelerator and it clicks over to the gas engine and then you have to stop suddenly ..... I will NEVER own a Toyota Prius -- its a dangerous car. Do not buy. I hear the batteries and the drive motor are very expensive to replace and have a short 8-10 year life... if safety doesn't concern you -- then maybe the 13k to replace those two items should.....
rayray Posted: 3/19/2010 8:28pm PDT
Bob Posted: 3/19/2010 9:21pm PDT
Basically, you have no evidence to support your conclusion. You could probably determine the cause positively if you had a magical reality dumper, which creates a perfect and accurate log of everything that is, but you don't.
lashbera Posted: 3/19/2010 9:47pm PDT
Graveleater Posted: 3/20/2010 6:26am PDT
jim Posted: 3/20/2010 8:02am PDT
Peter Posted: 3/20/2010 8:48am PDT
Joe Michaels Posted: 3/20/2010 10:06am PDT
Gav Posted: 3/20/2010 2:34pm PDT
You're crazy. Electric Motors often last beyond 1,000,000 miles before needing their bearings replaced. With new bearings ($80) they're good for another 1,000,000 miles.
As for the batteries, the Prius onboard computer makes sure the batteries have an easy-breezy life and last beyond 10 years before being recycled.
benhur Posted: 3/20/2010 5:03pm PDT
Jay Posted: 3/20/2010 5:35pm PDT
chris Posted: 3/20/2010 6:18pm PDT
I find it pathetic that people immediately think this is toyota's fault w/o even considering that these people might just be full of crap. Every single wreck that happens could be blamed on this magical acceleration...that doesn't make it true. People lie to avoid taking the blame ALL THE TIME.
gp900bj Posted: 3/20/2010 9:34pm PDT
There is no singular master computer (or "the computer" as you stated) used in any automobile today. Modern vehicles typically use close to 10 major micro-controllers and as many as several 100 minor embedded micro-controllers.
Each of these major devices has unique supply and protection circuitry and can operate independently of one another, while also providing redundancy in some cases as well as cross diagnosis of errors in others.
So even if a throttle controller should fail (and there is no evidence to suggest that has occurred in any of these cases), there is still NO reason why the black box should also fail.
theresa Posted: 3/21/2010 7:11am PDT
Dick Posted: 3/21/2010 10:02am PDT
perhaps you would like to stay home for ever
Len Russell Posted: 3/22/2010 7:27am PDT
Andy Posted: 3/22/2010 9:51am PDT
Samantha Rogers Posted: 3/22/2010 4:27pm PDT
John W Posted: 3/23/2010 9:57am PDT
JoBlo Posted: 3/23/2010 10:48am PDT
First if you buy a Toyota you must be.
wolff Posted: 3/23/2010 5:19pm PDT
john Posted: 3/23/2010 9:26pm PDT
common sense Posted: 3/24/2010 4:28pm PDT
Marc Posted: 3/24/2010 10:27pm PDT
bobby dee Posted: 3/26/2010 6:42am PDT
Steve Posted: 3/27/2010 6:03am PDT
BigWave Posted: 3/27/2010 6:43am PDT
The so-called black box will have all the information from the sensors and actuators recorded. It won't be able to determine driver intention, but it can tell engineers, Toyota's or NHTSA's, how the car was functioning. No "magical reality dumper" required.
BigWave Posted: 3/27/2010 7:26am PDT
BigWave Posted: 3/27/2010 10:52am PDT
It's plausible, I saw it back in the 80s working with testing of pre-production Ford trucks and vans that had an idle speed control motor on the carburetor. The testing done at Ford's Bemidji Minnesota facility had incidences of high fast idle. After a lot of testing and investigation of potential problems we realized that the ECM (they were called EECIV by Ford) were picking up transmissions from and to the airport that was on the same property. RFI may turn out to be the culprit.
ECMs are spec'd and tested for RFI. I'd be surprised if Toyota missed this, but it would explain why they aren't finding evidence that supports a driver's claim of sudden acceleration. I'm not taking the driver's side in all cases, but I think there may be a mix of real and imagined, and misdirected blame in all these incidents.
EightyFourSupra Posted: 3/28/2010 8:48am PDT
Charlie Posted: 3/31/2010 10:49am PDT
BigWave, thank you for countering the rest of Bob's misinformation.
Sudden Acceleration Posted: 4/14/2010 12:54pm PDT
You Posted: 4/21/2010 11:03pm PDT
Also I wanted to throw in there now that it's been a few months since the recalls were announced and there's pretty wide spread knowledge of the sudden acceleration defect of Toyotas, I'm sure there's lots of people looking to make a quick buck by driving their car into a wall and blaming Toyota. Lying to make someone or something look bad and make yourself a victim is pretty popular these days. I by no means am saying that that is what's happening, but it's something to think about. It happens to celebrities and athletes all the time, why not a big auto maker?
mike Posted: 5/26/2010 8:10am PDT
mike Posted: 5/26/2010 9:26am PDT
Alex Posted: 10/28/2010 3:34pm PDT
Glenn Beek Posted: 2/10/2011 10:09pm PST
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