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Another deadly 737 Max control bug just found!
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windsmurf:

--- Quote from: GeorgeOfTheJungle on June 27, 2019, 12:30:08 pm ---The toyota unintended acceleration issue/bug didn't trigger any watchdog either.

--- End quote ---

It did... which led to $2.4 billion+ in fines and settlements.
https://en.wikipedia.org/wiki/Sudden_unintended_acceleration
sokoloff:

--- Quote from: windsmurf on July 06, 2019, 10:42:14 pm ---
--- Quote from: GeorgeOfTheJungle on June 27, 2019, 12:30:08 pm ---The toyota unintended acceleration issue/bug didn't trigger any watchdog either.

--- End quote ---
It did... which led to $2.4 billion+ in fines and settlements.
https://en.wikipedia.org/wiki/Sudden_unintended_acceleration

--- End quote ---
I thought a significant concern in the Toyota unintended acceleration case was that the watchdog system did not detect all task failures and specifically did not detect the failure of the task that calculated throttle angle.
donotdespisethesnake:

--- Quote from: sokoloff on July 06, 2019, 11:25:53 pm ---
--- Quote from: windsmurf on July 06, 2019, 10:42:14 pm ---
--- Quote from: GeorgeOfTheJungle on June 27, 2019, 12:30:08 pm ---The toyota unintended acceleration issue/bug didn't trigger any watchdog either.

--- End quote ---
It did... which led to $2.4 billion+ in fines and settlements.
https://en.wikipedia.org/wiki/Sudden_unintended_acceleration

--- End quote ---
I thought a significant concern in the Toyota unintended acceleration case was that the watchdog system did not detect all task failures and specifically did not detect the failure of the task that calculated throttle angle.

--- End quote ---

Different types of watchdogs being discussed here (regulatory vs system). Generally  the system watchdog is a crude "is the main task still running" type of thing. Detecting if all individual tasks are still running - and running correctly -  is another thing all together.

It's hard to write correct software in the first place, writing software that monitors itself and corrects errors is a magnitude or two harder.
floobydust:
Watchdog does nothing for scambled variables that are out of range, or a task that is hung. Toyota had insufficient room for the stack which caused much drama.
You have to add more sophisticated algorithms that are not taught in university for fault detection and recovery.

Toyota's are more than happy to engage into Reverse while moving forward. The engine literally leaps out of the engine compartment, close to breaking something.
It's just idiot embedded software again, clown forgot to check for zero speed before engaging. Even a 1970 Chevy with hydraulic computer in a TH350 would refuse such a command.
GeorgeOfTheJungle:

--- Quote from: floobydust on July 07, 2019, 08:25:07 pm ---Even a 1970 Chevy with hydraulic computer in a TH350 would refuse such a command.

--- End quote ---
LOL I have one of those... Are you sure?
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