Hi Brett, the ps and ac signals would be used to raise the rpm to
compensate for the additional loads of the ps and ac.

Pensionerd.

On Thu, Nov 14, 2013 at 1:48 PM, Brett Ne <brettn777@gmail.com> wrote:

> Okay, now it's time for a dumb question: why do we need input signals from
> the power steering pump and air conditioner?
>
> We already have input from the Hall sensor telling us what the engine speed
> is, and if it's too low we increase the idle air flow & if it's too high we
> decrease the idle air flow...who really cares whether the change in idle
> speed is from AC, or PS, or from a belt driven coffee grinder accessory
> that someone has installed.  If the throttle valve is closed, then adjust
> the idle air flow to keep the rpms within a narrow range.  When there is
> partial throttle, keep the idle air flow at a moderate level to avoid
> shutting down the engine if the throttle is released suddenly.  What's
> wrong with my thinking?
>
> Brett
>