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SmokeNoMore
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Re: Autonomous
SmokeNoMore   5/21/2014 2:54:07 PM
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Agreed!  My 2010 car has had more computer/electrical issues than I care for.  I miss the days when the car didn't think so much for me.  What we really need in the US is enforcement of laws.  Enforce "distracted driving" laws and keep cars simple.

DU00000001
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Re: Safe state for ADAS
DU00000001   5/21/2014 2:21:40 PM
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"... safe state would be a smooth stop."

Depending on the current state of the vehicle the stop might not be too 'smooth'. Anyway - following current legislation (hopefully not only here in Germany implemented that way) the following driver has to keep a distance that enables him to stop without touching.

Regarding a piston seizure (still heard  of regarding vans/ buses) might create a significantly shorter stopping distance if nothing else breaks.

Sanjib.A
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Re: Safe state for ADAS
Sanjib.A   5/21/2014 2:01:17 PM
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"...safe state is "stopped". Thus all propulsion components are - relatively - easy to implement."

I also had the same thought in my mind that safe state would be a smooth stop, Then a question occurred to me...what would happen in a busy highway where, all the vehicles are moving at high speed and suddenly a car stops due to a failure...would that be safe for others behind? I did not find the answer yet.

Frank Tu
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Autonomous
Frank Tu   5/21/2014 12:43:38 PM
We can't even eradicate "unintentional acceleration" or deal with key chains laden with half a dozen keys in cars, yet designers and companies are unwilling to even admit to such problems right now.  The cost of a standard automobile continues to rise faster than the cost-of-living and the electronics in a car costs 5x what a consumer-level equivalent would cost - and it's even higher when bought over the dealers' parts counter.  We're a long way from a car driving itself successfully or cheaply.  So stay sober and stop reading your phone.  Or maybe your seat will buzz you to attention.

DU00000001
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Re: Safe state for ADAS
DU00000001   5/21/2014 10:59:52 AM
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Regarding the safe state, automobiles are not that critical:
Believe it or not - he safe state is "stopped". Thus all propulsion components are - relatively - easy to implement.

Other things like braking or airbag are much more challenging thinking of autonomous vehicles: if ABS detects a failure it is sufficient to light the MIL (malfunction indicator lamp). This will not really help in an autonomous vehicle...

prabhakar_deosthali
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Re: Safe state for ADAS
prabhakar_deosthali   5/21/2014 12:43:49 AM
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I would say, a fail-safe system for Autonomous cars , where a worst case scenario could be the engine failure, A back up system with a battery powered drive and braking system  and the software that could take the car to the curbside safely- the way it is done for autonomous lifts when there is a power failure.

Sheetal.Pandey
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Re: Safe state for ADAS
Sheetal.Pandey   5/20/2014 2:01:53 PM
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Functional safety is in deed critical for autonomous cars. There are specially designed embedded enviornment for car  software and for autonomos cars the worst case scenarios can be considered.

Sanjib.A
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Safe state for ADAS
Sanjib.A   5/20/2014 1:28:05 PM
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When a safety system is designed and accessed, it stresses on defining the safety function of the system and also it stresses in defining "safe state" of the system in case there is a failure. The intention behind designing a functional safety critical system is only to minimize "undetected dangerous" failures. Hence as per the safety standards, ISO26262 / IEC 61508, there are limits set for probability of dangerous failure (PoDF) & Safe faulre fraction (SFF);

Hence, a safety system is allowed to fail but shall fail safely. I wonder what would be the "safe failure" for ADAS if a potentially dangerous failure is detected or if there is a "safe failure"....what would be the safe state then? Engine shutdown? Certainly not? on a highway this could create troubles.  

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