This is to control the fuel mixture on a turbo motor cycle.
It’s a budget landspeed motorcycle. I did some testing and tuning at an offical NZ avent last week and it outperformed all expectations. I struggled with getting fuel mixture right while riding though.
At the moment I control manually while riding using exhaust gas read out and turning a small valve either in or out.
It’s carbureted so much unheard of to adjust fuel curve while riding... cost me $18 NZ to set up so very proud of my invention and how well it works.
I want to automate it now so I can give the actual riding of the bike the attention it deserves at high speed.
The exhaust gas meter I have has a analog output and approx 1.1v is good for my req tune at full throttle. Any movement in voltage up or down needs to be converted to movement either way.(preferably clock/anticlockwise)
Ideally a stepper motor would suit as can fit to the valve I currently use... however the movement/rotations will need to be restricted to say 1 or 2 turns either way to avoid valve being wound right out during idle and slowing down etc as exhaust gas readings can vary a lot in these cases and actual valve movements only have effect when on throttle and turbo boost active.
Also it will need to reset to a known position or zero at either shut down or start up.. not sure if this is possible but without this it could run itself out of range with only a couple of shut downs. I can easily get feeds on bike to provide consistent power as well as switched with engine etc to provide proper shut down etc.
I have selected Arduino as this seems available and cost effective in NZ but any other suggestions would be appreciated.
The ability to tune the rate and amount moved would be a bonus and stop possible speed wobbles in stepper/valve .. getting near best fuel so slower move with more pause..eg over/under 0.1v of target only move say 3steps and pause 1 sec.
When a long way off best fuel need bigger moves and less pause in valve ...eg over/under 0.2v of target move say 8 steps and pause 0.5 sec.
It is possible for me to make a valve to work on an arm at quarter turn each way (servo???) but would be a last resort...prefer the stepper motor running turns on valve I have as a lot of tuning work has gone into this to date.
Obviously a lot more info needed to write a sketch but throwing it out there.. no parts purchased as yet ..
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I have been working as an embedded programmer for more than 10 years. Arduino platforms are among the ones I worked with. I am ready to help an discuss all the details of the task.