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.
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.
@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!
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.
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.
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.
A Book For All Reasons Bernard Cole1 Comment Robert Oshana's recent book "Software Engineering for Embedded Systems (Newnes/Elsevier)," written and edited with Mark Kraeling, is a 'book for all reasons.' At almost 1,200 pages, it ...