@ johnny 2007
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Nope to what ?
The sensors on the car did not see the truck and thus the car's automatic systems thought the road in front was clear, hence the system did not call for a reduction of speed.
No, it wasn't vision based, it was primarily radar based at that time with Vision as a secondary input.
The radar system would ( should ) have received a reflection from the truck that indicated that there was an object in front of the car within the safe stopping distance for the speed of the car.
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No, that's not how they work. I can find you something to read on it but the short version is they need at least two reflections to identify the closing speed.
Edit: here you go. https://www.wired.co.uk/article/tesla-fire-truck-crash-autopilot-accident
Closing speed is not the critical factor in this incident, critical was an object in the path of the car that was it seems not detected by the sensors,
If the radar had Doppler speed detection then a single pulse would have detected a stationary object (*) in front of the car and known how far that object was from the car.
The car's own speed sensors would ( should ) have provided a value for the minimum safe braking distance.
(*) the truck was crossing the highway hence the vector along the highway would have been zero
If the radar had Doppler speed detection then a single pulse would have detected a stationary object (*) in front of the car and known how far that object was from the car.
The car's own speed sensors would ( should ) have provided a value for the minimum safe braking distance.
(*) the truck was crossing the highway hence the vector along the highway would have been zero
No ACC can pick up that sort of closing speed. It was a critical factor.
The Wired article is a good introduction.
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I wrote "could claim". Light and radio are both e.m. radiation. You may think they're different, until you see Maxwell's equations, and try (and fail) to find a discriminant.
Do you care how it's transmitted? If so, why?
There are overlaps. What might appear a requirement may be just a property. Like coherence or bandwidth.
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Primarily though, ACC is not for emergency braking / collision avoidance though; it is for controlled cruising, adapting to variations on that.
To my simple mind, the (Tesla equivalent of, if present) "collision avoidance system" was the thing that failed here.
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How the hell did Volvo leave out a sensor for the bleedin obvious?
quote from said article
These systems are designed to ignore static obstacles because otherwise, they couldn't work at all.
end quote
So these systems are useless when confronted with a stationary vehicle in front of them.
At least they are ( mostly ) claimed to be only an assistance to the driver
why am I reminded of this over confidence in radar ( it is fictional )
Silva Captain and the Lighthouse - The Inspiration Room
Silva Captain and the Lighthouse television commercial with lighthouse and ship
theinspirationroom.com
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I am equipped with detectors for light, but not for radio transmissions.
They're all part of the electromagnetic spectrum, but the terms - light, micro, radio, x, gamma and so on - are all human constructs, obviously.
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