Electric Vehicle Crash Tests
Electric Vehicle Crash Tests
(OP)
Anyone know if SAE or other bodies are working on crash test standards for electric vehicles?
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Electric Vehicle Crash Tests
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RE: Electric Vehicle Crash Tests
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RE: Electric Vehicle Crash Tests
RE: Electric Vehicle Crash Tests
Fire fighters are now being trained how to handle and "disarm" electric powered vehicles.
They are here and will STAY!!
RE: Electric Vehicle Crash Tests
This was covered in another thread somewhere commenting on the crash of a G Wiz in London.
It seems, in the interests of being "green" the tests are a whole lot different.
A fatal accident is reported here..
It appears the crash test people thought the G Wiz too dangerous even for their crash test dummies.
JMW
www.ViscoAnalyser.com
RE: Electric Vehicle Crash Tests
That is the main reason I mostly ride my bicycle on footpaths. Also financially, the risk/cost of a fine vs the risk/cost of a collision involving a car stacks up in favour of riding on footpaths.
It would seem reasonable from comments above that a sitting time of 1 week be applied to the tests for electric cars. I guess an internal short in the battery is even possible in a petrol or diesel fuelled car, just to a lesser extent due to less batteries and lower voltages.
Regards
Pat
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RE: Electric Vehicle Crash Tests
"I love deadlines. I love the whooshing noise they make as they go past." Douglas Adams
RE: Electric Vehicle Crash Tests
The standard for cell failure is the nail penetration test. See the video: http://www.youtube.com/watch?v=f30fBFitkSM
I don't know what kind cells more recent electric vehicles are using but the Telsa uses 6,831 cylindrical cells with a total of 56 kWh of stored energy.
Some more recent battery technologies are not quite so destructive in their failure modes, such as lithium iron phosphate or lithium nanophosphate.
RE: Electric Vehicle Crash Tests
I think they had lead acid as a first option.... Li Ion comes with the G Wiz L-ion
JMW
www.ViscoAnalyser.com
RE: Electric Vehicle Crash Tests
For gas vehicle tests, fuel is drained out after the test is certified as complete. In the case of the Volts, they just towed them away (fully charged) without tapping off the battery or powering it down. Funny that a gas car crash test would likely leak out some fuel or vapor after sitting for a few weeks and cause the same ruckus. If they had left the radio on in the Volts, nothing might have happened.
RE: Electric Vehicle Crash Tests
Contaminants getting on circuit boards designed without regard to preventing escalation of failure to the point of fire has happened in a number of applications.
A number of home appliance fire issues are the result of similar failure mechanisms.. For example a widely sold dishwasher that had problems with leaks from the rinse agent reservoir leaking down onto a circuit board and starting a significant fire.. In the recall notice for this problem, it was documented that in this instance the fire accelerated to the point that houses were burned down..
Circuit board fires and design evaluation methods prevent (we called it secondary circuit protection) have been for a long time..
I would say Volt fires, (and applicance fire issues) raises the question as to how much analysis was done in the design phase to ensure such failure mechanisms were not in the design.
It doesn't take much imagination if you consider the resins commonly used in glass/epoxy circuit boards, types of components (e.g. carbon resistors, that when overloaded, can glow at red temperatures, and ABS plastics in the vicinity, that it all can become a nice smoke/fire initiator if protection is not inherent in the design.
Very briefly a design analysis/test cycle looks at the energy sources present and the components/mechanisms in the design to open circuit the failure following a time/current limit profiles well known in the industry to stop a short/low resistance failure from escalation to fire.
Analysis of the adjacent materials with regard to their ignition points and ability to contain a fire is another important aspect.
In a joint project with Motorola many years ago they introduced me to a process called "Failure Mode Effects Analysis" ht
Good practice to employ in any significant design venture, let alone one that uses new technology and your company/product reputation is at stake.
RE: Electric Vehicle Crash Tests
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RE: Electric Vehicle Crash Tests
JMW
www.ViscoAnalyser.com
RE: Electric Vehicle Crash Tests
Cheers
Greg Locock
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RE: Electric Vehicle Crash Tests
The usual explanation, so far as I can tell, is that the people who actually knew how to design a washing machine, and how not to, became 'too expensive', and were replaced with more affordable recent graduates, who have never done their own laundry, or fixed a broken anything.
Mike Halloran
Pembroke Pines, FL, USA
RE: Electric Vehicle Crash Tests
Cheers
Greg Locock
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RE: Electric Vehicle Crash Tests
I think Greg is talking about the height of the center of gravity above the base plane, which would affect overturning resistance, a subject of interest to 'Elf 'n Safety folks, but I'm not sure why Greg is being coy about it.
It's certainly a good reason to put a washing machine's motor as low as possible, but circuit boards and even their power supplies grow smaller and lighter every year, so you probably can't move the CGZ by more than a few mm by moving all of the electronics up or down.
One might be tempted, however, to do it by omitting the usual control cupola above the machine shell, and putting everything in the base, in the interest of a cost reduction by means of eliminating an entire major piece of sheet metal or plastic.
Mike Halloran
Pembroke Pines, FL, USA
RE: Electric Vehicle Crash Tests
The G-Whiz is a quadricycle hence does not need to comply with crash test regulations. My Friend did the Top Gear G whiz crash test.
RE: Electric Vehicle Crash Tests