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It is the oddest thing driving a 5-speed transmission and an electric motor. One gets used to downshifting to get more power. But, I seem to get higher amp draw (and thus higher acceleration) with upshifting.
If I have it in too high of a gear, then the faster I go, the more amp draw (with pedal to floor).
Quote from: CliffordK on 02/03/2012 19:03:48If I have it in too high of a gear, then the faster I go, the more amp draw (with pedal to floor).Is that the electric motor controller doing that?An electric motor wouldn't normally do that I think.
Clifford, are the motor and battery currents the same thing? I imagine they are, but they could conceivably be different.
One common way to "fake" variable voltage is to essentially create variable time slices at full voltage, I think, although one could potentially use capacitors to de-ripple it somewhat.
I would assume that "pedal to the metal" would give full voltage.
I also like the idea of a powered trailer (aka a pusher) - with driven wheels (from a traditional IC engine), which could potentially offer better fuel economy than the above trailer as it saves a conversion to electric and back again; though ...sorry, you cannot view external links. To see them, please
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I dunno. The problems are that the transmission adds extra weight, and running the engine under different loads and revs makes it far less efficient. You're much better off just running it at one speed and load. I mean that's basically how the prius works. Also having a trailer pushing you like that would induce potential issues with jack knifing.It's just a bit too clever for its own good, whereas towing a trailer behind you with a generator on board is simple and straightforward. Also you don't need as much engine power because you can cruise and charge and the engine doesn't need to give you the peaks.
Anyway, I've been looking at possible upgrades for my EV battery array. The current lead batteries that I have are HEAVY. And, unfortunately there is a weight/range trade-off.A direct conversion to Lithium should double (or more) my range from about 40 miles up to perhaps 100 miles which would be adequate for most local driving, but still be pushing it for "road trips".
Obviously the initial investment would almost certainly be quite a lot higher for the self-builder, as old donor cars for a 'pusher' are cheap, whereas used gensets around ~10kW are not usually so.
The pusher trailer on the other hand is a cheap and cheerful solution.
No, it's a complicated and difficult solution, you have to handle the gearing and control issues from the car in front. Both trailers and generators are standard items, that are easily available.
I'm not sure if someone has mentioned this yet but there is currently being developed a carbon 'slurry' that can store and discharge electricity at massive rates depending on the size of the slurry tank/converter, if this could be utilized for electric vehicles, they could run on a tank of said slurry, then when they need more power, go to a petrol station, attach the car and have the negatively charged slurry extracted and replaced with positively charged slurry? ...sorry, you cannot view external links. To see them, please
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