Breaking News
News & Analysis

Functional Safety Critical for Autonomous Cars

Freescale teams up with Neusoft and Green Hills
5/20/2014 10:50 AM EDT
18 comments
NO RATINGS
1 saves
Page 1 / 2 Next >
More Related Links
View Comments: Newest First | Oldest First | Threaded View
<<   <   Page 2 / 2
SmokeNoMore
User Rank
Author
Re: Autonomous
SmokeNoMore   5/21/2014 2:54:07 PM
NO RATINGS
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
User Rank
Author
Re: Safe state for ADAS
DU00000001   5/21/2014 2:21:40 PM
NO RATINGS
"... 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
User Rank
Author
Re: Safe state for ADAS
Sanjib.A   5/21/2014 2:01:17 PM
NO RATINGS
"...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
User Rank
Author
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
User Rank
Author
Re: Safe state for ADAS
DU00000001   5/21/2014 10:59:52 AM
NO RATINGS
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
User Rank
Author
Re: Safe state for ADAS
prabhakar_deosthali   5/21/2014 12:43:49 AM
NO RATINGS
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
User Rank
Author
Re: Safe state for ADAS
Sheetal.Pandey   5/20/2014 2:01:53 PM
NO RATINGS
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
User Rank
Author
Safe state for ADAS
Sanjib.A   5/20/2014 1:28:05 PM
NO RATINGS
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.  

<<   <   Page 2 / 2
Most Recent Comments
michigan0
 
SteveHarris0
 
realjjj
 
SteveHarris0
 
SteveHarris0
 
VicVat
 
Les_Slater
 
SSDWEM
 
witeken
Most Recent Messages
9/25/2016
4:48:30 PM
michigan0 Sang Kim First, 28nm bulk is in volume manufacturing for several years by the major semiconductor companies but not 28nm FDSOI today yet. Why not? Simply because unlike 28nm bulk the LDD(Lightly Doped Drain) to minimize hot carrier generation can't be implemented in 28nm FDSOI. Furthermore, hot carrier reliability becomes worse with scaling, That is the major reason why 28nm FDSOI is not manufacturable today and will not be. Second, how can you suppress the leakage currents from such ultra short 7nm due to the short channel effects? How thin SOI thickness is required to prevent punch-through of un-dopped 7nm FDSOI? Possibly less than 4nm. Depositing such an ultra thin film less then 4nm filum uniformly and reliably over 12" wafers at the manufacturing line is extremely difficult or not even manufacturable. If not manufacturable, the 7nm FDSOI debate is over!Third, what happens when hot carriers are generated near the drain at normal operation of 7nm FDSOI? Electrons go to the positively biased drain with no harm but where the holes to go? The holes can't go to the substrate because of the thin BOX layer. Some holes may become trapped at the BOX layer causing Vt shift. However, the vast majority of holes drift through the the un-dopped SOI channel toward the N+Source,...

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed