[ausev] Trike conversion: Circuit Question.

[MLAB]

jtp wrote:

>In the circuit design of this Electric Motorcycle,
> Would it be feasible to have a "Passing Battery"
>linked into two DPDT (if they exist) contactors in order to provide more
>voltage temporarily if one needed to accelerate and merge into traffic more
>safely utilizing another battery such as the momentary use of the Auxiliary
>12 volt battery, while isolating the contactors, etc,  with a small sealed
>gel, or small array of LI-ION nano-phosphates, for the 10 second boost
>stage?
>Would the controller  be able to take a surge and pulse as well?
>Dan.
>

Consider this approach...

Spec the battery voltage and motor winding to be capable of going up to 
your desired "turbo" speed.  Then alter the signal to your throttle to 
get the behavior that you want. 

For example, usually, your throttle would be biased to only take you up 
to part of your top speed (let's say half).  That way, you will have 
finer control in that range of speeds, which would correspond to real 
traffic conditions, such as stop and go gridlock or being stuck behind a 
bicycle on a narrow 2-lane road.  When merging onto the expressway, you 
hit the booster and the throttle would take you over your whole range 
(with 0 still being 0, so that accidentally hitting the booster while 
not on the throttle would not make the vehicle jump).  Then you could 
operate in that range, with less precise control but a higher top speed.

That way, all your batteries would still be available at normal speeds, 
meaning each battery wouldn't have to work as hard and would discharge 
evenly, and accessing turbo speeds would only require doing switches on 
the low power throttle lines.

-- 
Mike Librik, LCI #929
Easy Street Recumbents
(512) 453-0438
45th and Red River Streets, thereabouts
Central Austin
info at easystreetrecumbents.com
www.easystreetrecumbents.com
www.urbancycling.com