Regenerative Charging
What's anybody think of hooking a switch to the gas pedal that only switches on when the gas pedal is all the way up? This would be hooked to the field on the alternator so that unless you are slowing down or at idle there would be no work being done by the alternator. I guess you would need a deep cycle battery.
My calculations go like this with a 60 amp alternator 12V*60A/60Min=12WH per minute deceleration so if the car draws 100W you would have to decelerate 8Min/Hr This would probably get you around all day around town. You would want to put a bypass switch for driving at night so it would work normally though. If you went with a RV type alternator you could double the amount of charge per minute on deceleration for about 10 Lbs extra. Maybe glue a thin film kind of solar panel to the roof. |
FritzR -
I have a 90 amp alternator. Would that mean I need to decelerate 12 min/Hr? Sounds like a good city car mod. CarloSW2 |
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I think a better idea (and one I've considered, but haven't yet acted on) is a relay that comes on if the brake lights are on AND your car is "in gear" (not clutch in, and not in Neutral, "in gear"). The way I figure it, you really are "SLOWING DOWN" if you pressing on the brakes (however lightly) and the car is "in gear". And if you really want to cause the "alternator braking", without using much in the way of brake pads, it's pretty simple (with a setup like this) to just press the brake pedal just hard enough to trip the brake light switch (but without actually triggering the brakes themselves). So if you had a relay like this, triggering the "alternator braking" should be as simple as just pressing the brake pedal just a little (not enough to turn the brakes on, but hard enough to turn the brake lights, and therefor also the alternator relay on). BTW: If you did do this, be sure to also put a switch on the dash, so that you can "revert to stock" behavior if/when needed, just by "flipping a switch"... |
BMW has something like this.
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I think this makes good sense. Doesn't the vx use some type of alt control like this? I am usually coasting to stop with the engine off so that wouldn't utilize the system BMW has well.
I also like the idea of the thermoelectric waste heat recovery BMW is playing with. |
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This is my HYPOTHESIS. I could be WAY off on this. What do you guys think?? Oh and I just realized that Fritz said "thin film". I didnt see that and I just assumed regular 1" thick solar panel thats widely available. (BTW, cant wait till prices go down on those) |
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With a fuel injected car this might be different. It might behave like when you turn the A/C on and increase the idle. I'll try pulling my alternator cable later and see what happens "I have a 90 amp alternator. Would that mean I need to decelerate 12 min/Hr?" That would depend on how much your car draws. If it was 100W then only 5 min/hr with a 90 amp alternator. I think a lot of cars draw less than this. In my old corrolla I drove for 6 months with a weekly drive of 200 miles to LA on Sunday, 5 miles a day to and from work, 200 miles back to San Luis Obispo, then I'd pull the battery and charge it. This was using the radio and everything else except never the headlghts at . That car with a 60 amp alternator would only need to charge 4 min/hr at most |
Newb question here, but would a smaller amp on an alternator give better FE than a larger amp? Umm, provided your not drawing more current than you can produce.
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Thanks for everyone's input. I think I'll play around with this once my CRX is done, the engine is broken in, and I have some benchmarks to compare it to. I'll post my results in a couple of months |
My Insight has regenerative braking, 'cause it's a hybrid. About a year after I got it , I rigged a parallel switch to the one on the brake pedal. Now when I regen, it's without hydraulic drag.
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