Peri Hartman via EV wrote:
One more idea, to confuse you even more :)
You could drop the tranny and keep the ICE. That tranny is rather long
and there may be room in the space to put a large motor and a generator
without modifying the tunnel. The generator would charge the battery or
directly run the motor, depending on load conditions.
The benefits:
- you can have the ICE kick in automatically when the load requires it
or the battery becomes low;
- the ICE can run at an optimal RPM for best efficiency;
- you might need less mods to the underbody.
Cons:
- there might not be enough room for both gen and motor in the tranny
space;
- you would need a larger motor to get the total hp (kw) that you desire;
- you would need a special mounting bracket for the generator;
- some efficiency loss over having the ICE connected to the driveshaft.
That's an interesting idea. Make it a classic series hybrid! Past
examples tell us that they don't have the ultimate in efficiency, but
they certainly work! The generator on the ICE, and the electric motor on
the drive shaft are not coupled -- they work just like a diesel
locomotive, as an electric replacement for the transmission.
An aircraft starter-generator would be perfect for the generator. They
have a "floating" splined shaft (no bearing at the shaft end), which is
intended to connect to the crankshaft of an engine for support. They
mount to a bolt circle, just like a transmission. They are physically
quite short in length, and fairly light. The one I have is less than 12"
ling, about 11" in diameter, and weighs about 80 lbs. (A Jack & Heinz
rated at 30v 500a continuous). It has both a series field (for starting)
and a shunt field (for generating).
Then a nice big WarP or ADC 9" motor and 2000a Zilla controller. They
can easily deliver the tire-burning torque without a transmission. The
battery pack you pick (and tire traction) will be what limits your top
speed and acceleration!
--
The definition of research: Shoot the arrow first, and paint the target
around where it lands. -- David Van Baak
--
Lee Hart's EV projects are at http://www.sunrise-ev.com/LeesEVs.htm
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