Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 7 / 11   >   >>
rich.pell
User Rank
Author
Black box?
rich.pell   10/28/2013 9:21:51 AM
NO RATINGS
Based on the following quote by Barr, it seems there was a black box in the car:

"We also obtained and reviewed the source code for the black box and found that it can record false information about the driver's actions in the final seconds before a crash."

Can we infer from this that the black box (or event data recorder (EDR)) in this case failed to show that the brakes were being applied as claimed by the plaintiff?   



rich.pell
User Rank
Author
Re: standard OS?
rich.pell   10/28/2013 9:09:08 AM
"It would be great if Barr Group could share their calculation of the probability of occurrence of the failure mechanisms they identified"

+1

Kinnar
User Rank
Author
The rate of Increase of Acceleration
Kinnar   10/28/2013 9:04:57 AM
NO RATINGS
Was the rate of acceleration was specified in any of the reports both the agencies had provided. Or in the event of accident it was found that how much approximate was the rate at which the car had accelerated?

coombes
User Rank
Author
Re: standard OS?
coombes   10/28/2013 8:45:31 AM
NO RATINGS
The "failed to comply" simply refers to the general OSEK compliance testing.

There is (or was - it's been a while since I was involved in OSEK) a requirement that you submit your OSEK implementation for compliance testing before you are allowed to call it an OSEK-compliant operating system. Toyota's OSEK apparently hadn't been submitted for this testing, so was not officially OSEK-compliant (and couldn't legally refer to their OS as OSEK - as the trademark terms for OSEK say the only permitted use is for compliant OSs)

Misha17
User Rank
Author
Software quality
Misha17   10/28/2013 7:17:08 AM
NO RATINGS
For me, as for embedded programmer, more interesting to look at their source code, not only or may be not so, at 800-page report, with respect to Barr group.

And may be another punishment, may be more efficient, besides money, oblige such company to publish their source code or at least faulty parts of its



Bert22306
User Rank
Author
Re: Master throttle control
Bert22306   10/28/2013 2:02:49 AM
NO RATINGS
"Before power brakes and automatic transmissions, using the right foot for the gas pedal (a 'light' touch) and the left foot for the clutch and the brake (a 'heavy' touch) made good sense."

This is getting rather tangential, but it seems to me that when driving a stick, you have to be able to press both the clutch and the brake together, although not exactly simultaneously. Therefore, it's practically impossible to use the same foot for both.

Slow down for a red light. You lift your foot off the accelerator. Perhaps you downshift for some engine braking. You start applying the brakes. As the car slows down, clutch still engaged, you will have to push in the clutch to keep the engine from stalling, as the car comes to a stop. Meanwhile, your right foot has been braking all along.

Or, slowing down for a tight turn. Foot off the accelerator, you brake gently with your right foot, then push in the lcutch to downshift, release the clutch while still braking gently, and then accelerate out of the curve. Sill pretty hard to do with just one foot.

Honestly, I see no good reason for pushing the accelerator and the brake at the same time, unless you're a teenager looking to spin the wheels when the light turns green, and still too clueless to understand the damage you're doing to dad's car.

junko.yoshida
User Rank
Author
Re: Single bit flip
junko.yoshida   10/28/2013 1:15:42 AM
NO RATINGS
Frank, yes, the memory corruption referred here is caused by software defect.

Now, there are different types of software defect that causes memory corruption. They include:
-Buffer Overflow
-Invalid Pointer
-Dereference/Arithmetic
-Race Condition(a.k.a., "Task Interference")
-Nested Scheduler Unlock
-Unsafe Casting
-Stack Overflow

The experts' group found software defect in 2005 Camry L4 in every single item listed above.

 

junko.yoshida
User Rank
Author
Re: Single bit flip
junko.yoshida   10/28/2013 1:07:14 AM
NO RATINGS
Frank, just to clarify the findings by the experts' group in this case, let me add a few more details.

Accorinding to the experts group,

"2005 Camry L4 source code and in-vehicle tests confirm that some critical variables are not protected from corruption. For example, a)Mirroring was not always done; and b)No hardware protection against bit flips."

The group also found "sources of memory corruption are present." The group referred to that "Stack overflow can occur; and there are software bugs -- NASA found bugs and Barr Group has found others."

The group, thus, concludes that they found enough evidence that "Toyota's ETCS software can malfunction."

anto75
User Rank
Author
Re: standard OS?
anto75   10/28/2013 12:30:41 AM
"failed to comply" suggests that OSEK compliance was mandatory. I'm pretty sure that's not the case. More in general, it seems to me that the article could do a better job in providing context.

A 2005 electronc controller was most likely designed in 2002, given the long and rigorous tests that are standard practice in automotive. So it may be unfair to compare a 2002 design with what is considered state of the art in 2013.

Somebody else has already pointed out that ISO26262 did not exist then, but also I would bet that automotive grade dual-core lock-step microcontrollers with SRAM ECC did not exist then.

Technology goes forward by improving on the existing state-of-the-art, but that is a moving target.

It would be great if Barr Group could share their calculation of the probability of occurrence of the failure mechanisms they identified, and if they could compare such probability with the probability of a mechanically-only failure and also with the probability of electronic failure in other manufacturers' vehichle of the time. Which I think is the definition of state of the art.

DrQuine
User Rank
Author
Re: Master throttle control
DrQuine   10/27/2013 8:59:07 PM
Before power brakes and automatic transmissions, using the right foot for the gas pedal (a "light" touch) and the left foot for the clutch and the brake (a "heavy" touch) made good sense. Obviously riding the clutch or the brake caused undesirable wear and was avoided.

<<   <   Page 7 / 11   >   >>


Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Radio
LATEST ARCHIVED BROADCAST

What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.

Brought to you by:

Most Recent Comments
Like Us on Facebook
Special Video Section
The LTC2380-24 is a versatile 24-bit SAR ADC that combines ...
In this short video we show an LED light demo to ...
02:46
Wireless Power enables applications where it is difficult ...
07:41
LEDs are being used in current luxury model automotive ...
With design sizes expected to increase by 5X through 2020, ...
01:48
Linear Technology’s LT8330 and LT8331, two Low Quiescent ...
The quality and reliability of Mill-Max's two-piece ...
LED lighting is an important feature in today’s and future ...
05:27
The LT8602 has two high voltage buck regulators with an ...
05:18
Silego Technology’s highly versatile Mixed-signal GreenPAK ...
The quality and reliability of Mill-Max's two-piece ...
01:34
Why the multicopter? It has every thing in it. 58 of ...
Security is important in all parts of the IoT chain, ...
Infineon explains their philosophy and why the multicopter ...
The LTC4282 Hot SwapTM controller allows a board to be ...
This video highlights the Zynq® UltraScale+™ MPSoC, and sho...
Homeowners may soon be able to store the energy generated ...
The LTC®6363 is a low power, low noise, fully differential ...
See the Virtex® UltraScale+™ FPGA with 32.75G backplane ...
Vincent Ching, applications engineer at Avago Technologies, ...