General > General Technical Chat
Another deadly 737 Max control bug just found!
SparkyFX:
--- Quote from: floobydust on July 08, 2019, 04:39:43 pm ---Honda had to change their transmission software after people got stuck in the snow/ice and could not rock the car back and forth (drive, reverse, drive, reverse etc.) to get out. The transmission controller was slow and would not allow it.
If the transmission controller software was smarter, compares front/rear wheel speeds, it can know you are stuck in snow, mud, ice etc. and let you shift at speed without damage.
--- End quote ---
Old style systems have a transmission output speed sensor only (also used for the speedometer), so only driven wheel speed is available. Newer ones can get the info over the ABS wheel speed sensors for all wheels.
Anyway it doesn´t need to, under a certain speed it might be irrelevant, except parts might get damaged by doing so.
If switching gears takes too much hydraulic pressure off the system it might need a while to build it up again in idle, especially in cold weather (snow), when the car (and it´s transmission fluid) is not yet on operating temperature.
The problem is that everyone has his/her own understanding of how high the snow should allowed to be without packing a shovel and using it.
floobydust:
Imagine never having driven a car (piloted an airplane) and writing control software for it.
SparkyFX:
--- Quote from: floobydust on July 08, 2019, 05:10:28 pm ---Imagine never having driven a car (piloted an airplane) and writing control software for it.
--- End quote ---
This is why state machines need a really thorough documentation.
blacksheeplogic:
--- Quote from: SiliconWizard on July 08, 2019, 05:01:45 pm ---Most automated systems are not giving enough information to the users IMO - that would already make a world of difference.
--- End quote ---
Simplistic at best and leads to UI clutter, that 'important' indicator not seen because of 1,000 other indicators. The user needs an indication of the unexpected/abnormal not every time an automated system performs a routine action. In some cases, there is difficulty is in deciding if the action being performed is 'routine' and therefore warrants attention.
20/20 hindsight. This lecture on the 3 Mile Island incident is a really good overview of 1st Story bias - 'Sitting in my armchair I would have known' vrs 2nd Story fact.
Well worth watching but Skip to 24:30 for the 2nd story summary.
BravoV:
For great grand big sale .. cheap ... great discount ... NOS (New Old Stock) ... The Flying "Nodding" Coffin ...
For sure they're running out of storage parking space for the unsold merchandises, looks pretty bad, especially at the huge idling capital sitting doing nothing on the tarmac.
I'm guessing the management would love to have them stack up vertically like ordinary boxes in warehouse.
Details -> HERE
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version