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

Ron Schroeder rjs at bnl.gov
Tue Aug 27 02:49:44 GMT 2002


Here is a very interesting article about lean engine operation:

http://www.avweb.com/articles/pelperch/pelp0018.html

Ron Schroeder
WD8CDH
day 631 344-4561
nite 631 286-5677


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


<snip>
> I guess you have to lean the mixture,
> controlling it for RPM using eg. a PID controller (algorithm).
> (you measure RPM anyway)
>
> potential problems (IMHO):
>  - if the bypass path is too narrow, it cannot flow enough air
> at some conditions (air conditioner turns on, which happens rarely
> on motorcycles)
>  - if you make the mixture too lean, the exhaust temperature
> can get too high (maybe this is not that big of a problem
> with small flowrates and RPM)


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