Sensor Linearization

[peter paul fenske]

>
>Good luck,
>Todd Knighton
>Protomotive Engineering
>Email: knighton at concentric.net
>
>P.S.	Also working on Idle stabilization routines for Bosch stuff, 
>what a pain, any insight on what you've tried might help.
>
>Hi Todd:
>I am not too sure what you have done. To begin there appear to be
>two problems with idle control. Entry into the idle speed with an
>over shoot and a resulting oscillation. This can be helped with
>a stepper speed algorithm. The idea is to slow down the stepper 
>as the desired idle speed is approached. Oems take about 3 seconds
>to reach the desired Idle speed from Idle reset. The second method
>is to add a idle control offset to you timing control when in
>idle mode. This gives you one more controller for your PID.
>A variation of a few degrees will fine tune the idle but not
>really affect much else. Some oems do this. I have not yet tried it.
>I found trying to idle the dingy at 500 rpm makes it very unstable.
>The best I could do was about 900 rpm and once in a while there would
>be a dampened idle control loop oscillation. I didn't experment too 
>much with dead time control. The second is when the algorithm doesn't
>respond fast enough. Thus there appears to be a tightrope here.
>Anyways when I get back in business I will keep you posted.
>TNX for all the help Todd
>GL:peter