A couple of bright MIT kids recently came up with one of those ideas that makes you go, "Duh! why didn't i think of that?" By simply using the hydraulic action of the shocks to drive micro turbines, they were able to reclaim energy lost to bumps and vertical movement, and increase efficiency by 10%. In the effort to increase battery range as much as possible, this seems like an easy bolt-in component that would boost the Mod S from 300 to 330 miles per charge. Here's the link:
http://web.mit.edu/newsoffice/2009/shock-absorbers-0209.html
According to the article the system is best suited for heavy trucks and could be used to replace the alternator (in heavy trucks). Tesla cars do not have alternators. The battery they talk about recharging is the low voltage lead-acid battery used to start the truck. Tesla cars do not have a lead-acid battery or a starter motor for that matter. I doubt that this system could achieve the voltage necessary to charge the Tesla battery pack. It might be useful for running the electric heaters in a car. However it also might be more economical to recirculate waste heat from the battery and motor to provide cabin heat rahter than add a new system.
In addition to the special shock absorbers this energy recovery system requires hydraulic lines to connect the shock absorbers to a generator and its own electronic control system; all of which would take up space and add weight to the vehicle, not to mention cost.
It might be practical in the future (emphasize future). However, I suspect that improvements in battery chemistry and battery pack design would be more productive and I am sure Tesla is investing in that area.
Actually there IS a small 12V sealed lead battery in front of the front right wheel in a Tesla Roadster. It's a backup power source for some critical car systems.
It doesn't give 10% efficiency boost for road machines simply because there is not enough energy to get that improvement in vibrations which the suspension reduces.
Pretty much same thing as with solar panels. There just is not enough energy there to be worth of the cost and complexity of the system. Not for energy gain. However they could be worth it just because of improvement of suspension (especially smart control they provide), and in that case it would be stupid not to use that energy they generate.
@tesla1233:
Yes, obviously, a sedan would have less shock action and generate less power than a heavier vehicle, but it would still produce some. Of course i know electric cars don't have alternators or starters or lead-acid batteries. Do you honestly think anyone on this forum would think those things? Don't be so obtuse. Electric output can be used to charge any kind of battery. No, it would not fully charge the batteries, it would just add a small percentage to the range. It would not require it's own control system, it would just be wired to the existing box. Slight change to the firmware. Weight would be nominal.
Very little gain for the cost. Same with solar panels.
What about an electromechanical actuator based active suspension system similar to what BOSE is doing:
http://www.youtube.com/watch?v=hNlJ8OGTfNU
No hydraulics. May not generate that much power, but the performance and ride comfort increases would certainly help Tesla compete with what's sure to be the next big thing in luxury performance sedans.
CB
The Bose system uses so much power that they have fitted an extra generator to the ICE of the car, just to power the suspension. So I think it would not be good for the range of an electric car. Except for that it's neat.
In my oppinion, that the system is useless for gas-powered vehicles, as it is for electric vehicles. For the first type, it generates less power than a usual alternator, for the second type, not enough power to charge the battery, therefore it doesn't justify the investment.
It reminds me of the little fan you put in the window to generate electricity in a car, when you can use the 12V plug...
The power generated from the braking system is not something to waste. The gains are multiple: it minimizes the brake wear (electric vehicles are generally heavier, therfore the brakes wear faster) and it charges the batteries. That is something useful.
There ar so many useless inventions out there, and this goes in the same category...
Hey, I have one: you can generate power each time you sit in the car. You can jam several motors in the seat, so when you seat, it moves and you can generate 1V per 50 pound. Heavier people could make up to 6v... Lol
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