Air Flow Measurement

[Mazda Ebrahimi]

Carl Haas wrote:
> 
> 
> 
> On Tue, 19 Nov 1996, tom cloud wrote:
> 
> >
> > If you know BAP and MAP, you know delta-P across opening -- granted,
> > the opening size varies with throttle position, but you've got TPS
> > for that -- seems that air flow could be rather accurately determined
> > without much hassle?????
> >
> >
> > Tom Cloud <cloud at peaches.ph.utexas.edu>
> >
> 
> I like how you think...
> 
> Would any corrction be needed for density?  If so, is there such a thing
> as an electronic air-density sensor to use as a running correction
> factor?
> 
> Carl HaasThat is what intake air temperature is used for.  Also, if you are going 
to use this approach, you may want to be careful about the location of 
the MAP sensor take-off.  It is important (especially with large intake 
plenums) to have the take-off near the throttle body not in the back of 
the manifold.  This makes a difference in transient response of the 
system because of the intake manifold filling time during a snap 
throttle condition.