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Antony Anderson
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Re: X means...
Antony Anderson   10/25/2013 8:16:51 PM
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Legal documents are usually dull as ditchwater, but not this one. According to Judge Selna in his Order of 7th October 2013 Granting in part and denying in part motions to exclude expert testimony and Toyota's Motion for Summary Judgment in  the case of Ida Starr St John v. Toyota on page 71:


"Task X calculates target throttle angles, monitors for system failures and enters fail safe modes. The death of Task X freezes the target throttle angle. When task X dies, the fail safe mode is not triggered unless the driver removes her foot from the brake pedal for a minimum of 208 ms."

It sounds to me as if Task X is the torque controller and is accepting all the torque input requests, including that from the driver via the accelerator pedal, and presumably a brake on off signal and is then computing what it considers to be the desired throttle angle, comparing that with measured throttle angle and then using the error signal to drive the throttle to the minimise the error. 

 

 

 

 

 

docdivakar
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CEO
Re: X means...
docdivakar   10/25/2013 7:59:44 PM
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@Junko: my guess is that the Oklahoma case will probably lead to a class action where the most that consumers owning the affected Toyota vehicles will get is a recall and replacement of parts. The league of lawyers will of course get much of the monetary settlement!

MP Divakar

_hm
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CEO
Re: X means...
_hm   10/25/2013 7:49:23 PM
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@Sean: I too agree with your observation. It should not be that disturbing. It may have purpose of high mileage.

seanraman0
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Re: X means...
seanraman0   10/25/2013 6:54:23 PM
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Junko - I drive a prius.  I bought this car not too long after all the news about sudden unintended acceleration 4 years ago. There was a lot of talk about manual error. I can tell you that, after driving the car for 3+ years, there has been about 15 or so instances when the car accelerates wihout my assistance - not too much but nonetheless an acceleration. I have learned to manage that. I still like my prius.

 

Sean Raman

rick merritt
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Author
Re: X means...
rick merritt   10/25/2013 6:24:30 PM
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I love a good mystery!

I'll hazard a guess this may be some proprietary technique or feature Toyota asked the court not to reveal in public documents...just a guess and I bow to any automotive guru who might really know.

junko.yoshida
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Blogger
Re: X means...
junko.yoshida   10/25/2013 5:54:18 PM
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chanj, these are all good questions.  thanks. I am writing a follow up soon. 

chanj0
User Rank
CEO
X means...
chanj0   10/25/2013 5:49:31 PM
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X is the 24th alphabet. There are 24 cases. What a coincidence!


When NASA found a bug in toyota electronic throttle system (ETS), did the team take consideration of the complete system? For example, if the driver is slamming the brake, will the ETS be triggered to stop?

This case is definitely interesting given Toyota has been slamming multiple times in the last few years.

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