Demargon

Carry weight for regenerative brake improvement

32 posts in this topic

I suspect when I carry a full backpack the regeneration of battery charge is highest ¿any clue to confirm that?

Thanks 

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Can't use darknessbot in my android. If anyone have it installed can do some testing and determine how high is the regenerative value with and without carrying extra weight.

By the way ¿there is a optimal speed for regenerative braking?

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Are you going to strategically place weights at the crests of all your local hills?

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Yea, generally the benefit of going downhill is more than offset by having to go back up hill.

 

Allen

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The point is pick a rock or water in the top of the hill and leave it when his potential energy are depleted (at the end of the slope). I don't have any idea for measure the benefits and if worth the effort, carry heavy thinks is stressful

¿how can measure the regenerative braking performance?

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The efficiency is irrelevant, as long as it does not depend on weight, it's already factored in there. The argument simply is, since you add linearly more energy with weight, and that energy goes into recharging (this assumes everthing else, especially the friction of the tire, stays the same which probably won't work out so well with 30kg extra), you should have a proportional increase in energy gained. So x% more overall weight gives you x% more recharging (at whatever efficiency that it has in both cases, as long as it is the same efficiency).

This is just a rough estimate to get an idea which situations could be used so you even see a difference from recharging with different weights.

15 hours ago, esaj said:

Doubt it's actually worth it in the end, but still it would make an interesting experiment.

Agreed. But maybe if I feel like lobbing 30kg of rocks around some day, and don't brake too hard:P

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I disagree with the notion of regenerative braking because unlike the simple electric motor bolted in place (allowing torque)to a fixed surface the EUC is a space age electronic balance between the riders weight applied to the pedals below the center of the wheel and a self balancing current applied to parts of the 'wheel motor' as determined by a logic circuit.

Going uphill or downhill or level or remaining stationary requires self balancing current to the wheel via a circuit. 

While some riders report battery level increases while going downhill, the thought of simply reversing current through the main board to the battery seems unlikely if not hazardous.

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As work in gravity =mass *gravity *height, and work=energy, obviously if the we carry more weight (mass*gravity }, more work will be done by it. So more energy have to be absorbed anyhow, dissipated as a heat or transformed to a battery charge. Of course minus the losses, friction and energy required to keep the system alive, which (my opinion) is minimal. 

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On 5/5/2017 at 6:27 PM, meepmeepmayer said:

More weight means more potential energy that goes into regenerative charging of the batteries (and extra friction, mostly of the tire). Potential energy is linear in mass, so approximately (assuming regen efficiency and everything else is constant for a certain route if you only change your weight), increase your (wheel + rider) weight by x% and you get x% more back.

This means, pack 10kg of or rocks into your backpack (10% of 100kg which for simplicity assumes 80 kg rider + 20 kg wheel) at the top of a hill and you get 10% more battery charge back going down than without the rocks.

You could do the experiment, make sure everything else stays the same (battery % at the top, temperature, battery health, your speed, ...) and find a big enough hill so your estimated difference in regeneration can be seen on the battery status. Ideally, you should have a few percentage points of difference from regen so either loooong hill or lots of rocks.

An example: 3 km at 7% average incline gives me 10% back on my ACM 1300 (very roughly, and I may remembering wrong). If I were to put 30 kg of rocks into my backpack at the top, it should be 13% back instead. This could be seen on the battery status clearly.

Not sure if carrying tons of rocks is worth it for the bit of battery. But it's a nice idea to try, sounds crazy at first, but the longer you think about it, the more interesting the idea is.

Until you overstress, or overheat or over tilt the wheel and it shuts off.. and you end up underneath that ton of rocks. 

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19 minutes ago, GoinPostal said:

Until you overstress, or overheat or over tilt the wheel and it shuts off.. and you end up underneath that ton of rocks. 

No pain, no gain:D

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I don't know how many people know this, but newly discovered archaeological information shows that Atlas was just a unicycle enthusiast trying to get across the galaxy. 

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1 hour ago, meepmeepmayer said:

No pain, no gain:D

I'd like to agree with Meep on that one.

 

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On 5/9/2017 at 5:56 AM, esaj said:

correct switching

Speaking of switching (topics) it was maybe 2002 when Sinnika retired. She was from Finland. Having worked 3 jobs a day over most of her life in the Boston area, she paid for her house in Roxbury. After retiring she went back to her family in Finland. The head lab director gave her a big retirement party.

Sinnika , shorter woman than I, made 'media and plates' (very much needed) for people in the labs from chemical 'recipes' stored on cards or sheets of paper. When I first met Sinnika the latest Mac was but a modest cube with a screen but only in the possession of the PhDs. Several times a week she would walk into the lab and say 'you know what' and then delve into a conversation. She exchanged letters with someone young (maybe in Africa) and sent them money. She would sometimes ask to have her English phrases corrected before mailing her letter. 

One day she bought the game 'Pokemon' for her relatives kids. She said it was a really popular game with kids. Who knows maybe her family has recently played pokemon-go with her.

It's been over ten years since she sold her house and went back to Finland. One day I was working in the lab alone. She stepped into the doorway and snapped a picture and gave me a copy.

Russians, she once said, 'you can't trust them' as I described a flight sim game called ef2000 (sorry Russian readers).

http://www.csoon.com/issue13/ef2000.htm

Those were strong words from the meek Finnish woman who worked three jobs a day in the Boston area, when she was younger, to buy her house before her retirement caused her to sell and return to Finland. I don't know where though.

The same people threw a departing party for me when I left in 2006. It was much smaller than Sinnika's party.

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Posted (edited)

13 minutes ago, The Fat Unicyclist said:

You just need to retrofit one of these to your EUC...

images?q=tbn:ANd9GcQfs43Gx0dHNDOM4-qOwBt

In fact, if you connect in 3-4, you would never need to recharge your wheel at all! :huh:

That looks familiar, is that a generator to power the headlight?  Those were so cool!  Tiny generator!  3 or 4 ought to do it.:unsure:  Thanks for bringing back memories.:cheers:

Edited by steve454
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Posted (edited)

47 minutes ago, The Fat Unicyclist said:

You just need to retrofit one of these to your EUC...

images?q=tbn:ANd9GcQfs43Gx0dHNDOM4-qOwBt

In fact, if you connect in 3-4, you would never need to recharge your wheel at all! :huh:

Hey....welcome back! Your idea buddy ....I say go for it! The first perpetual EUC!:P

Edited by Rehab1
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27 minutes ago, Rehab1 said:

Hey....welcome back! 

Thanks... It's good to be back! 

I had a couple of months of overly frantic work, followed by most of a month in Europe (with bugger-all data available). 

But I'm ready now, and shopping for some P-EUC dynamos.

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Posted (edited)

3 hours ago, The Fat Unicyclist said:

Thanks... It's good to be back! 

I had a couple of months of overly frantic work, followed by most of a month in Europe (with bugger-all data available). 

But I'm ready now, and shopping for some P-EUC dynamos.

Whoa looky who's back?!  :w00t2:  So did my psychic summoning powahs get you all itchy for some forum participation??? Geez Louise better late than never I guess!

Now if only I could get that Cloud guy back on... EUC Avengers unite!  :clap3:

By the by who's this @The Skinny Unicyclist ?  Any relation?

 

Edited by Hunka Hunka Burning Love
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