Sensor linerization

[peter paul fenske]

>Munch.......
>>i think the interpolation is "good enough" for most  applications.
>>the curve on gm temp sensors   is   about   20% away from linear  
>>if you want a  small table from chiltons ill send it to you .
>>Bur.........
>
>We use a table lookup and have a dual mode pullup resistor.  I'll leave the
>details to your imagination.
>---------------------------------------------------------------------------
>J.W. Harris			Delco Electronics - Powertrain Eletronics
>Project Engineer		One Corporate Center, M.S. CT40-C
>				Kokomo, IN 46904-9005
>
>E-mail: jwharris at holli.com
>	jwharris at eng.delcoelect.com
>---------------------------------------------------------------------------
>Hi J.W. et al
>Just spent the evening with a spreadsheet playing with sensor data.
>To duplicate GMs curve of 255 1.8 degree increments starting at
>-110.2 degrees takes some doing. To get within one percent you
>have to add an offset to discreet regions and still interpolate.
>The conclusion I have reached for DIY EFIers is to do like Bosch.
>Simply add a corrector pos or neg. This gets us close enough.
>Also a plot of sensor data does reveal the S curve people suggested.
>As to GM. By using a 300 ohm pullup with a simple offset an extremely
>good approximation can be obtained with execellent resolution. This
>region starts at about 180 degrees where you start thinking about
>closed loop control. 
>As for the Map most speed density lookups start at 20 to 30 bar.
>Thus it is not necessary to expand the resolution. Worthy of note
>is the lookup is not necessarily linear.
>Tnx again everybody:
peter
Oh by the way can somebody let me know how to post something on
FTP with FTP for windows. (peter window illiterate)