[Diy_efi] idle control strategy for SD systems w/o bypass air control?

[Kent Martin]

Well since this is a DIY EFI site might I suggest you use
an air bypass valve and control it. I have written some code
to control a stepper motor to do just that.
Using a PID loop, you can easily control a stepper motor
of an air bypass valve to get a nice stable RPM and easy
starting.
Kent.

----- Original Message -----
From: "Jerry Wills" <jswills at attbi.com>
To: <diy_efi at diy-efi.org>
Sent: Sunday, August 25, 2002 12:10 PM
Subject: [Diy_efi] idle control strategy for SD systems w/o bypass air
control?


> A lot of DIY and I suspect some aftermarket EFI systems have no
> bypass air control. So how do you get a smooth idle at your
> chosen RPM? I know, adjust the injector timing, But on what
> do you base your decisions, and how fine grain do you need
> to be, and what do you decide?
>
> Two reasons I brought this up. One is purely self motivated,
> as I have a motorcycle engine with ND (uncrackable) injection,
> and I want to replace it without losing its great, always starts,
> rain or shine, and very stable idle.
> The other reason is that I sarched thru the archives and didn't
> come up with much, yet it seems like a problem all DIYers will
> face, and even those aftermarket folks as well.
>
> let the laughing begin,
>
>                         Jerry Wills
>
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>
>



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