Michael Rigby-Jones wrote:

> > -----Original Message-----
> > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
> Behalf
> > Of Walter Banks
> > Sent: 25 November 2011 10:42
> > To: Microcontroller discussion list - Public.
> > Subject: Re: [OT] model 12-cylinder engine
> >
> >
> >
> > Peter Johansson wrote:
> >
> > >  The trick, I imagine, would be building a
> > > carburetor for a more efficient engine.
> > >
> >
> > The current engine controllers have efficient carburation. They use
> > fuel injection with a model of the relationship between time of the
> > incoming air and its location during detonation. The fuel metering is
> > adjusted every 2-4 microseconds to get uniform mixing.
> >
>
> I don't see how the fuelling could possibly be adjusted that frequently
> when the injection duration itself is significantly (orders of
> magnitude) longer, even on a direct injection gasoline engine.

The flow rate of the injector is being adjusted as it is injecting fuel
to track flow and mixing of the incoming air. Five or six years ago
this added a major improvement in fuel economy and a reduction
in engine maintenance.

w..

--=20
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