AFM measurement/backpressure

[Greg Hermann]

>At 09:34 11/03/00 +0800, Bernd Felsche wrote:
>>>>None that I can recall.  Lucas/Bosch systems use them, and patent
>leasees of
>>>>them.
>>>>Numerically probably MAP is most common, then hot wire, and then combos of
>>>>MAP/hot wire.
>>
>>>So what is the best way?? The rover system uses MAP and inlet air
>>>temperature...
>>
>>Even hot-wire is passé. :-)
>
>How does hot wire work?? Is is a little heater that uses X power then you
>measure the temperature... more airflow the more heat is taken from the
>heater?? Surely you would also need air temperature, or am I completly off...

The resistance of the wire varies with its temperature, so one approach
would be to measure the voltage required to hold the wire at a constant
current. The more air flow you have at a given IAT, the cooler the wire
gets.

Greg


----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org