Air flow measurement

[Jens Knickmeyer]

> Peter> Below boost, the air flow rate was measure by an
> Peter> ultrasonic flow meter which gave out a pulse train,
> Peter> of a frequency proportional to the air velocity. The
> 
> From: "Matthew Lee Franklin" <fran0054 at gold.tc.umn.edu>
> Matt> I had heard only of the hot wire or hot film made by
> Matt> Hitachi and others.  If it really is ultrasonic I'd be
> Matt> curious to hear who makes it and if there are any good
> Matt> SAE papers on it.
> 
> The Chrysler Technical Reference Manual for the Eagle Talon
> describes in detail how the system works.  In summary, the
> sensor creates Karmann vortices (sp?) and an ultrasonic
> sensor detects their presence.  The frequency of the sensor
> pulses is used as an indication of air flow.
> 
> --------
> Roberto L. Landrau	landrau at mitre.org
> 
> 
The sensor system is spelled Carman Vortex. There is an
explanation of how it works in the "Bosch Automotive Handbook"
(the blue one - don't know the correct englisch title cause
I've got the german version).

Read you,

Jens.