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From: Tegger on 2 Feb 2010 13:25
Mark <makolber(a)yahoo.com> wrote in news:7e7aec70-aaca-452d-af0d-
7ae36cf2a4de(a)o16g2000vbf.googlegroups.com:

> OPEN LETTER TO TOYOTA
> POST THROTTLE CONTROL SOFTWARE ON THE INTERNET FOR WORLD WIDE REVIEW
>
> Toyota has announced a fix for the accelerator problem. The fix
> consists of a shim. This is purely a mechanical change implying the
> problem is purely mechanical. A large part of the system consist of
> electronics hardware and software.
>
> Many doubts remain that the problem is purely mechanical. It is very
> easy for a subtle flaw to exist in software and electronics systems
> that can take many years to uncover.




The fix is not only mechanical. Toyota is also revising its PCMs so that
simultaneous brake/gas application results in the engine's power being cut
back, the opposite of what happens now.

So far there is no evidence that any of the unintended acceleration
incidents are due to anything more than mechanically-stuck pedals, or to
pedal misapplication.

If you're that concerned about unintended acceleration, you may want to go
after Ford as well. They account for 28% of all unintended acceleration
incidents.


--
Tegger

From: Paul Hovnanian P.E. on 2 Feb 2010 14:22
Tegger wrote:

> Mark <makolber(a)yahoo.com> wrote in news:7e7aec70-aaca-452d-af0d-
> 7ae36cf2a4de(a)o16g2000vbf.googlegroups.com:
>
>> OPEN LETTER TO TOYOTA
>> POST THROTTLE CONTROL SOFTWARE ON THE INTERNET FOR WORLD WIDE REVIEW
>>
>> Toyota has announced a fix for the accelerator problem. The fix
>> consists of a shim. This is purely a mechanical change implying the
>> problem is purely mechanical. A large part of the system consist of
>> electronics hardware and software.
>>
>> Many doubts remain that the problem is purely mechanical. It is very
>> easy for a subtle flaw to exist in software and electronics systems
>> that can take many years to uncover.
>
>
>
>
> The fix is not only mechanical. Toyota is also revising its PCMs so that
> simultaneous brake/gas application results in the engine's power being cut
> back, the opposite of what happens now.

And all the left foot brakers are going to sh*t bricks!

> So far there is no evidence that any of the unintended acceleration
> incidents are due to anything more than mechanically-stuck pedals, or to
> pedal misapplication.

Better solution (for future reference): Build an accelerator pedal with a
microswitch attached to the pedal surface. If the driver lifts their foot,
the microswitch circuit (independent of the pedal position sensor) disables
the throttle plate drive system (torque motor, solenoid, or whatever they
use) so that the return spring closes the throttle. You'd have to lock this
out with a cruise control engage signal, but other than that, it would be
redundant to the electronic controls.

--
Paul Hovnanian paul(a)hovnanian.com
----------------------------------------------------------------------
Have gnu, will travel.
From: Jim Thompson on 2 Feb 2010 18:52
On Tue, 2 Feb 2010 09:28:37 -0800 (PST), Mark <makolber(a)yahoo.com>
wrote:

>OPEN LETTER TO TOYOTA
>POST THROTTLE CONTROL SOFTWARE ON THE INTERNET FOR WORLD WIDE REVIEW
>
>Toyota has announced a fix for the accelerator problem. The fix
>consists of a shim. This is purely a mechanical change implying the
>problem is purely mechanical. A large part of the system consist of
>electronics hardware and software.
>
>Many doubts remain that the problem is purely mechanical. It is very
>easy for a subtle flaw to exist in software and electronics systems
>that can take many years to uncover. I site the classic case of the
>Therac 25 that is often used as an example of the difficulty in
>proving software reliability.
>
>See: http://en.wikipedia.org/wiki/Therac-25
>
>
>I have proposal to Toyota to remove these doubts.
>
>Post the software source code and circuit schematic diagrams for the
>throttle control electronics publically on the Internet.
>
>The design will then be reviewed by the collective abilities of
>1000's of software and hardware engineers. Provide an e-mail address
>for those with comments to send back to Toyota privately if they so
>choose.
>
>After a few weeks, if no one in the world uncovers any design flaw,
>then one can be very confident that no flaw exists. This may be the
>only way for the public to re-gain confidence in a complex system.
>
>Mark

Bwahahahahaha! Approval of Toyota's product by "committee/consensus"
;-)

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
From: Joel Koltner on 2 Feb 2010 20:37
"Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote in
message news:hiehm51k6tr4dut8v59evav5nfcmavs7fa(a)4ax.com...
> Bwahahahahaha! Approval of Toyota's product by "committee/consensus"

Worked for AGW? :-)

From: Martin Riddle on 2 Feb 2010 22:41


"Joel Koltner" <zapwireDASHgroups(a)yahoo.com> wrote in message
news:tr4an.215170$5n7.12973(a)en-nntp-09.dc1.easynews.com...
> "Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote
> in message news:hiehm51k6tr4dut8v59evav5nfcmavs7fa(a)4ax.com...
>> Bwahahahahaha! Approval of Toyota's product by "committee/consensus"
>
> Worked for AGW? :-)
>

But that was just a EU committee, the IPCC.
The problem with Toyota is no one wants to fail. If they admit it,
they'll be jumping from windows.

Cheers



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