LSM11

[PNefdt]

To:	garfield at pilgrimhouse.com

Hi guy,
  I've worked on the O2 system for about 2 years. I'm fortunate to work for a
race dyno company, so have facilities available. Unfortunately all this work
was done in company time, and I'd be hanged if I disclosed the 3d map,
however, I can explain exactly how to go about doing it;
first of all, the facts.
The LSM11 was designed to be temperature independant above lambda = 1.
Below 1, it's just like any other old sensor, except very repeatable between
any two sensors (which is the important part in production assembly of course)
There are two totally different methods which can be used
1. Stabilise the sensor at a known internal temperature, utilising a PID
controller, to control the temp to 750degC (method used by a upmarket($5k)
instrument)  
2. Compensate for internal temperature (the method I followed)

Method 1 is the easiest.
I, of course, being a gutton for punishment, chose the more difficult way, and
which I will explain.
You will need to be conversant in Motorola asm for the 68hc11, if you would
like to see/follow my code.

I will prepare a mail attachment, which I can post to the list, or to you,
whichever?

Regards,
Peter.