Sensor Questions?

[Bill]

At 10:42 AM 2/5/96 -0800, you wrote:
>
>Clint writes:
>
>>Quick question: what exactly is going to cause this "sudden increase in the
>>amount of required air" that is going to draw a vacuum?
>
>I don't know all of the physics behind it, but it is related to the velocity 
>and inertia of the air, length of intake track, etc.  The previous post 
>about "acceleration enrichment strategies that are a function of throttle 
>transients" was correct and is how the computer compensates for this 
>condition.
>
>>Just remember that a MAF system also has to be calibrated to the engine it 
>is
>>on.  The MAF give out a voltage (or frequency) depending on how much air is
>>going through it.  It does not tell you "currently, there is x Kg/sec 
>flowing
>>through me".
>
>Excuse me?  That's exactly what the MAF *does* tell you:  mass air flow 
>(kg/hr) flowing through the meter and into the engine.  That's the beauty of 
>the MAF.  Pressure, temperature, and density variations do not have a 
>(large) effect on the accuracy.
>
>Bryan Zublin
>bzublin at gi.com
>
>

I think what Clint is saying is that the MAF produces a frequency or voltage
PROPORTIONAL to the mass of air currently passing through it, rather than a
binary or BCD number showing exactly what the current flow is.....its all a
matter of the way he phrased the statement. With any 2-wire device, it's
usually the user's responsibility to decode the data into some meaningful
result.