That's a good question. I don't know. In this particular case, the expert witness was only allowed to see the source code under confidentiality agreement -- so that the exeprt's findings are made public in the court transcripts but not the source code itself.
I'm not any kind of an automotive expert, so I can't speculate on what X might be. I am glad that many of the details are public information. In so many product liability cases, the details remain confidential due to out of court settlements.
I've read material from Michael Barr for many years now. Based on that, I would consider him to be a very credible expert.
The point I was trying to make was that this particular legal document, a ruling by Judge Selna, had some interesting technical clues in it as to the nature of Task X. Anyone interested can contact me for further details.
I recently took out a new Toyota Sienna van for a test drive at my local Toyota dealer.
I was taken aback by my inability to maintain a steady speed. It seemed the throttle control was noisy, in that the vehicle would either surge ahead or hold back. When I turned on the cruise control the vehicle maintained a smooth steady speed. The salesperson with me simply denied there was a problem.
It appears that Toyota still has an accelerator sensor problem - perhaps whiskers caused by lead free solder or noisy pots.
It's unbelievable that after all this time and publicity, Toyota seems unable to solve the problem.
Automation will be having its own artifacts, some comments says here that the increase in acceleration is a manageable event, what I have noticed in most of the recent auto throttle control is some-kind of increase in the rpm and ultimately this will lead to increase in the acceleration in the car in transmission-ed. But the case has reached up to legal investigations beyond the engineers hand.
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.
Blog That A-Ha Moment Larry Desjardin 10 comments Have you ever had an a-ha moment? Sure, you have. The Merriam-Webster dictionary defines it as "a moment of sudden realization, inspiration, insight, recognition, or ...