MAP map or MAF map
Mike Wesley - SLIP
mwesley at oeonline.com
Mon May 1 12:09:23 GMT 1995
On Wed, 26 Apr 1995, Garrett McWilliams wrote:
> Steve wrote:
> >The upstream temp sensor in the hot wire sensor isn't there to measure
> >the actual temperature of the incoming air but to determine the change
> >in temperature between the heating element and the detection element.
> >A simplified mass flow meter would consist of two sensors, one upstream
> >and one downstream of the heating element. You would expect the down
> >stream element to be warmer than the upstream one because of the (heat
> >carrying) mass going in that direction.
> >So the difference in heating at the sensor is proportional to the mass
> >flow rate.
> >
>
>
> I had thought the MAF sensor measured how much current it took to keep
> the heated wire at a constant temperature, i.e. more air going through cools
> it off more -> more current to maintain temp of the wire. Is this also used
> or am I way off base?
>
> Garrett McWilliams
>
Absolutely correct!
Mike...
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