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Archive through February 07, 2014Sifo30 02-07-14  02:13 pm
         

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Pikeben08
Posted on Friday, February 07, 2014 - 02:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yes. That's one of the bigger challenges with regenerative braking. It needs to be computer controlled for acceleration as well to maintain a comfortable accelerator pedal feel. Much of this can be done with messages that already exist on the CAN bus but works much better if the system is setup from the beginning to accomplish it.
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Sifo
Posted on Friday, February 07, 2014 - 02:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

One thing that would kind of worry me with the added complexity is that our buses are already very buggy. We have all sorts of problems where the fix is to shut it off and reboot the system. I never saw Microsoft software being so temperamental. It's everything from engine management, transmission problems, to lights and wipers that have a mind of their own. It's literally a multiple time per day occurrence to hear the shop on the radio telling a driver to restart it to fix problems. I know it's a quality problem, not an actual technological problem, but it doesn't seem to be getting better. I'm amazed when I hear of turn signals that don't flash being fixed by simply restarting the bus! Then we want to add complex software to that?
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Brumbear
Posted on Friday, February 07, 2014 - 02:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Well we will see they seem to think it will work in an automotive capacity. Sifo public transportation meaning in buses using battery or in this case grahene power packs with say a graphene based solar panel on top of the bus.

http://www.technologyreview.com/view/521651/graphe ne-supercapacitors-ready-for-electric-vehicle-ener gy-storage-say-korean-engineers/
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Sifo
Posted on Friday, February 07, 2014 - 03:03 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'm not saying it wont happen, but personally, I've seen the promise of the electric battery breakthrough being just around the corner for at least 45 years now. I'm guessing it was going on before, but I was too young to know. Is it right around the corner now? That's what they are telling us.
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Brumbear
Posted on Friday, February 07, 2014 - 05:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yeah I hear ya there are a lot of factors to the thing never seeing fruition and truth is maybe it isn't the best thing for the economy right now either. Anyway I dig the fact that they are getting there.
Dave
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Natexlh1000
Posted on Friday, February 07, 2014 - 05:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I used to work for Quadtech. We made 1689 LCR bridges. The application engineers would come back from customer sites with info of entertaining tech. One such is the military was/is still working on replacing the steam powered slingshots on carriers with linear induction motors powered by supercaps.

The main problems that need to be overcome are the limit of how much current can be put in/taken out and the total capacity.

It's still almost impossible to beat the amount of energy density found in gasoline or alcohol. Think of how much energy is in 6 pounds(Gallon) of gas. How much energy would be in a six pound battery or capacitor?
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Sifo
Posted on Friday, February 07, 2014 - 06:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

So I was trying to reconcile the original link that gave some basic comparisons to lithium ion batteries that made this sound not too promising for an electric vehicle, and the article posted by Brumbear where they talk of using this new capacitor technology in electric vehicles. I'll admit I had a bit of a personal brain block in taking this in the first time round. That second article isn't talking about power the vehicle with the capacitor, that's still done with lithium ion batteries. The capacitor is only used for short term storage of braking energy. Not a bad use of this technology, but it leaves electric vehicle with one of the biggest drawbacks that they currently have. It takes a long time to refill with energy making them impractical for anything but a very basic commuter car.

Well we will see they seem to think it will work in an automotive capacity.

That was a very misleading statement that helped me misunderstand the article you posted. They aren't talking about using them in an automotive capacity, but augmenting in a small way the capacity of the main battery. Interesting twist, but leaves a huge problem unsolved.
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Hootowl
Posted on Friday, February 07, 2014 - 07:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

"One such is the military was/is still working on replacing the steam powered slingshots on carriers with linear induction motors"

Electromagnetic aircraft launch system. The new Ford class carriers will have them.
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Brumbear
Posted on Friday, February 07, 2014 - 09:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It mislead me as well sorry bout that
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Blake
Posted on Saturday, February 08, 2014 - 06:53 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Saw an article recently about some new battery tech that allows rapid recharging. Can't remember exactly where I saw it though. Might have been a topic here.
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Gregtonn
Posted on Tuesday, February 11, 2014 - 11:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

http://www.nature.com/news/graphene-conducts-elect ricity-ten-times-better-than-expected-1.14676?1

G
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Gregtonn
Posted on Wednesday, February 12, 2014 - 12:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It gets better.

http://spectrum.ieee.org/nanoclast/biomedical/imag ing/graphene-sandwich-enables-clear-images-of-biom olecules

G
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Sifo
Posted on Thursday, February 13, 2014 - 12:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Here's another "epic" thing that we have been waiting for forever. Have we finally turned the corner?

The lasers fuelling hopes of unlimited, clean nuclear energy


quote:

The fuel, composed of the two hydrogen isotopes tritium and deuterium derived from water, was compressed together under enormous pressures and temperatures for less than a billionth of a second, but this was enough to see more energy coming out of the experiment than went into it.


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