Recharging batteries while coasting?
12-05-2013 | 05:25 PM
#16
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as far as storage, hybrid cars have a very large or multiple battery cells to store the extra charge for when the gas engine shuts off to power the radio and all the misc electronics in the vehicle as well as power the electric motor to assist the gas engine for more powerful acceleration.
Last edited by Toasty359; 12-05-2013 at 05:28 PM. Reason: Added info
12-05-2013 | 05:28 PM
#17
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Posts: 7,341
12-05-2013 | 06:32 PM
#18
12-05-2013 | 06:36 PM
#19
All of the MOSFETs used in our brushless speed controls have intrinsic diodes ("substrate diodes") as part of their construction. These diodes are actually in parallel with the MOSFETs, and are reverse-biased in normal operation. If the motor voltage should spike higher than the battery voltage (as usually happens during partial braking), then current will flow into the battery through these diodes. Every brushless ESC I know of operates this way, so it's not a special feature. In fact, it's usually required to prevent overvoltage damage to the MOSFETs.
Chrysler experimented a fair bit with a flywheel storage system, and there has been other research. Also some have experimented with super capacitors. But as far as I know all current production electric/hybrid cars just recharge the battery. Going back at least to the GM EV-1/Impact from the mid '90s or so.
In the future I suspect we will see suspension energy converted to the batteries. Shock absorbers burn off a noticeable amount of energy.
There is some construction equipment, primarily excavators I think, that use hydraulic accumulators to store energy. Since they already have significant hydraulic and related control systems I've heard it works quite well.
In the future I suspect we will see suspension energy converted to the batteries. Shock absorbers burn off a noticeable amount of energy.
There is some construction equipment, primarily excavators I think, that use hydraulic accumulators to store energy. Since they already have significant hydraulic and related control systems I've heard it works quite well.
I must say, KERS in the Porsche 911 GT3 R is pretty slick. Would love to see something like that in performance trims of regular cars
12-05-2013 | 06:57 PM
#20
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I was expecting something simple like that. Thank you for the explanation.
I see. I figured having motors connected directly to the axles for regen braking may be a bit harsh on pedal response (too rough and jarring). I'm no electirical engineer
I must say, KERS in the Porsche 911 GT3 R is pretty slick. Would love to see something like that in performance trims of regular cars
I see. I figured having motors connected directly to the axles for regen braking may be a bit harsh on pedal response (too rough and jarring). I'm no electirical engineer
I must say, KERS in the Porsche 911 GT3 R is pretty slick. Would love to see something like that in performance trims of regular cars
One thing I want is movable aerodynamic devices. Lots of down force for braking, corners, and rain for safety sakes. Then DRS (low drag) for the straightaway for better fuel economy. There are a few examples, wonder if more can be done, affordably of course.
12-06-2013 | 06:18 AM
#21
Just like a very pretty, all-white CanAm car from the 1960's!
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