Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 7 / 7
Antony Anderson
User Rank
Rookie
Re: Counter intuitive brake action necessary in a sudden acceleration incident?
Antony Anderson   11/1/2013 8:20:24 AM
NO RATINGS
My understanding  of what Dr Barr is saying is something like this:

IF the driver already has their foot touching the brake

       AND IF a task death happens to occur

       AND IF the task death causes a UA

THEN the UA will continue for 30 seconds

      UNLESS the driver lifts their foot momentarily  off the brake pedal altogether,

             Thereby killing the UA and restoring control to the driver.



 

 

davidjohn_in235
User Rank
Rookie
Thanks for the article series
davidjohn_in235   11/1/2013 2:02:45 AM
NO RATINGS
Thanks Junko for the detailed coverage. The analysis described in the transcript is very useful & educative. As an engineer who has worked on non-critical automotive code, the article series gave a whole new understanding of the challenges and process required to test & qualify a critical automotive system

Bert22306
User Rank
CEO
Re: Counter intuitive brake action necessary in a sudden acceleration incident?
Bert22306   10/31/2013 7:13:11 PM
NO RATINGS
Actually, on the contrary, this testimony sounds less damaging to me.

First, the brakes did work throughout task x death.

Second, the problem of power not being cut, when brakes were applied, only occurs if task x death occurs WHILE you are braking. Otherwise, it seems that braking did cut the power. Just that the driver neeeds to be awake enough to realize that speed is going up and up.

Third, it's not all that un-intuitive to pump the brakes if you feel they aren't doing the job. Just like you push again and again on the leveator button, if the eleveator doesn't come. This detail had already been explained, actually. But last time around, it was not clarified that death of task x only made the brake fail-safe incomplete if task x died while the brake pedal was pushed in.

krisi
User Rank
CEO
Re: Counter intuitive brake action necessary in a sudden acceleration incident?
krisi   10/31/2013 7:09:06 PM
NO RATINGS
This is used to be a driving technique inslipery conditions before ABS was implemented

Antony Anderson
User Rank
Rookie
Counter intuitive brake action necessary in a sudden acceleration incident?
Antony Anderson   10/31/2013 6:51:39 PM
NO RATINGS

"Q. So in other words, if you're driving down the road and you put your foot on the brake to slow down, for whatever reason, during that time period task-x is where it actually dies, the vehicle starts to accelerate.

You've got to actually back off the brake and try and catch it?

A. That's correct. Which is both counter intuitive because your car is zooming away and you have to let go of the brake. And it's also dangerous because as you let off the pressure of the brake, at least you were applying some mechanical pressure, but as you let off the car speeds up. And so that may increase the risk in the short term, at least, before this fail-safe would take effect."

This is absolutely amazing! Counter intuitive - I'll say so!

It is interesting to note however that many sudden accelerations seem to happen as the driver is pulling in gently to a parking space or pulling out of a parking space. Could it be that with very light braking the brake switch is giving a rather indeterminate signal to the ECU which is being misinterpreted? This needs teasing out more


junko.yoshida
User Rank
Blogger
Re: Three-part series based on trial transcript
junko.yoshida   10/31/2013 6:50:51 PM
NO RATINGS
Kris, I am glad you feel that way. This case, I think, has legs, since most consumers as of today still believe that Toyota case is an old story; it's finished with Toyota's recall of millions of vehicles. But another trial, just like this one (buildling the case on the software flaws), is about to start in Santa Ana, Calif. next week.

Again, this vehicle in the Oklahoma case, 2005 Camry, by the way, is NOT on Toyota's recall list.

krisi
User Rank
CEO
Re: Three-part series based on trial transcript
krisi   10/31/2013 6:46:34 PM
NO RATINGS
thank you Junko for very comprehensive coverage...this has been an eye opening story for me...Kris

junko.yoshida
User Rank
Blogger
Three-part series based on trial transcript
junko.yoshida   10/31/2013 6:42:30 PM
NO RATINGS
We certainly don't mean to be "All Toyota All the Time" news; but we wanted to make sure that our readers have the opportunity to see snippets of what went on in the court room of Bookout v Toyota in Oklahoma. We created an exclusive three-part series based on trial transcript. The story above is the last in the series. The two others include: 


<<   <   Page 7 / 7


Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
<b><a href=Betajet">

The Circle – The Future's Imperfect in the Present Tense
Betajet
2 comments
The Circle, a satirical, dystopian novel published in 2013 by San Francisco-based writer Dave Eggers, is about a large, very powerful technology company that combines aspects of Google, ...

Max Maxfield

Recommended Reads From the Engineer's Bookshelf
Max Maxfield
6 comments
I'm not sure if I read more than most folks or not, but I do I know that I spend quite a lot of time reading. I hate to be idle, so I always have a book or two somewhere about my person -- ...

Martin Rowe

No 2014 Punkin Chunkin, What Will You Do?
Martin Rowe
2 comments
American Thanksgiving is next week, and while some people watch (American) football all day, the real competition on TV has become Punkin Chunkin. But there will be no Punkin Chunkin on TV ...

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...