jlparsons
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| posted on 12/3/09 at 05:30 PM |
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megasquirt electric reverse control
I few months ago I wrote a post on here pondering how I could wire up an electric reverse to either the clutch or brake sensor with a safety on the
neutral light so you could operate an on/off reverse with the pedals leaving your hands free to steer etc. I'm sold on this idea and intend to
use it or similar.
Now, looking at the megasquirt 2, it has several user customisable input-output channels. So... might some enterprising person be able to customise
one of these to send an output which could control a stepper which in turn would control the elctric motor?
If so, you could have a button on the dash/tunnel which tells the megasquirt that it's in reverse mode (with a safety via the neutral light and
maybe the clutch). While this is pressed, the megasuirt diverts the throttle input to the stepper output and just keeps the engine at idle (or
perhaps ups therevs a touch to give the alternator more juice to reverse). So this would leave you controlling the leccy reverse with the accelerator
just as if you were driving an automatic car in reverse. The only difference between this and a regular reserve is that the clutch wouldn't do
anything.
Anyone done it? Thought about it? Or think that they could?
I'm thinking that with the new BEC leccy reverse IVA requirements, this could be a winner.
Any resemblance to real persons, living or dead is purely coincidental. Some assembly required. Batteries not included. Contents may settle during
shipment. Use only as directed. No other warranty expressed or implied. Do not use while operating a motor vehicle or heavy equipment. Subject to
approval, terms and conditions apply. Apply only to affected area. For recreational use only. All models over 18 years of age. No user-serviceable
parts inside. Subject to change. As seen on TV. One size fits all. May contain nuts. Slippery when wet. For office use only. Edited for television.
Keep cool; process promptly.
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matt_claydon
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| posted on 12/3/09 at 05:58 PM |
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It could be done, but unless you had throttle-by-wire (not many bike engines with it, even if MS2 can control), how are you going to stop the engine
revving it's knackers off? I suppose you could rig some sort of cable disconnect from the throttle lever, but it'd be pretty
complicated.
Edit: actually, if you have throttle bodies with secondary throttle plates like a lot of bike have then you could probably program MS to keep these
closed to restrict air inlet.
[Edited on 12/3/09 by matt_claydon]
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jlparsons
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| posted on 12/3/09 at 06:13 PM |
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The idea is that when reverse mode is on, the megasquirt would maintain idle regardless of accelerator position, instead directing accelerator
position to the stepper channel.
Edit - hang on, I'm assuming a modern BEC would have throttle by wire here, my first mistake! Otherwise you'd have to fit a TBW system
and wire that to a megasuirt IO to.
Edit again - instead of using a TBW throttle assembley, could you just use the existing throttle body and a decent servo attached to the megasuirt via
a servo driver?
[Edited on 12/3/09 by jlparsons]
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