Air Flow Measurement

David Doddek pantera at pobox.com
Wed Nov 20 04:52:19 GMT 1996


>If you knew velocity and area, you could calculate
>volumetric flow rate.  This assumes that average 
>velocity measure you have adequate represents the
>real velocity profile over the area.  You still to 
>know density to determine mass flow rate.
>
>>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?????
>
>OK, now you've added barometric pressure (and you had
>temperature above), so you can figure out ambient air 
>density.  And you're transforming throttle angle
>to area, so presumably you can get mass flow rate.  
>(Assumption: flow coefficient of throttle (or orifice for
>that matter) is known.)
>
>But is it any less of a hassle than using a MAF sensor?
>I don't see a huge advantage of one system over the other.
>
>Anthony Tsakiris

With all of this talk about air flow, could some one please just give me the
actual working equations for calculating the quantity of fuel required based
on either the MAF or MAP or TPS methods.  I need something to work with.

David J. Doddek                                          |pantera at pobox.com
Owner SGD Electronics & Development Engr for Caterpillar |h 309 685-7965
Formula SAE Team Sidewinder 94-95                        |w 309 578-2931
89 T-bird SC,  69 Fairlane w/SGD EFI                     |fx 217 428-4686
74 Pantera w/Electromotive Tec-II Twin turbos and Nitros |
Hey, If you are going to go fast, go REEEAAL FAST.       |




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