Bosch LSM11 Resistance (Ri) Curve Data? (was RE: DIY_EFI Digest V5

[Dr Flowgood]

Modern Muscle is out of buisness, and I think I heard Mike Licht was involved
with Ramchargers performance shops somehow or another.  they are in Livonia.MI
im going out of town in the am so I hope that help

    Doug (heading to memphis ) J

Glenn & Debbie Woodhouse wrote:

> Thanks for the reply Eric.  I too saw this post a couple of months ago when
> surfing the archives.  I tried to locate Mike Licht and Modern Muscle in
> Detroit with no luck.  I have a scanned Bosch data sheet from the archives
> but it only provides me with A/F ratio to voltage and temperature (in the
> rich range).  I could have easily missed something in the archives though.
> If you find anything it would be appreciated.
>
> Does anyone know if Frank Parker is still at the fparker at umich.edu address??
> I haven't seen him posting in recent times.  I'll give that address a whirl.
>
> Glenn.
>
> ------------------------------
>
> Date: Mon, 30 Apr 2001 07:56:29 -0400
> From: Eric Fahlgren <efahl at adams.com>
> Subject: Re: DIY_EFI Digest V5 #591
>
> Glenn & Debbie Woodhouse wrote:
> >
> > Eric,
> >
> > I have dug through the archives and found the Bosch LSM11 curves that
> relate
> > A/F ratio to voltage and temperature (in the rich range) but I have not
> seen
> > the curves for probe resistance vs. temperature, which is the key to using
> > this sensor as a wide band meter without incorporating an EGT into the
> > system.  If you have this data or know where to get it I would be very
> > interested.
>
> Glenn,
>
> A quick scan of the '96 archives gives me this in a post from
> Frank Parker <fparker at umich.edu> dated 27 Nov 1996:
>
> > BUT there appears to be another solution- the Bosch LSM-11 sensor as used
> > in their LA-2 $5000 air fuel meter. The sensor alone is about $190. I just
> > purchased 3 more at that price from a Bosch distributor. I have the cal
> > tables on this sensor and I also gave copy to Jim. We started to design
> > an interface for this sensor as it is much simpler. This sensor has the
> > BIG ADVANTAGE that its voltage curve is a very close match to a std sensor
> > as thus you can just replace the std sensor in your car with the LSM-11
> > and then car will run fine on it. Then can hook up your a/f interface box
> > in parallal and read out a/f ratio. The main thing to solve with this
> sensor
> > is the large temperature correction. The idea was to use a PIC as a
> > controller. Figure out a math function ( 3rd order or so) to match the
> > std S shaped curve, then use the temp as an offset function in the
> > controller. The internal resistance of the sensor changes from about
> > 10 ohms to over 100 ohms and is a indication of the temperature.
> > To give you an idea of the shift with temp, note the following:
> >           OUTPUT      650 deg       750 deg        900  deg
> >       830 mv        13.94        13.23           12.02
> > As you can see if you are tuning for max power, there is a big difference
> > between 13.9 and 12.0 air/fuel at a fixed 0.83 volts.
> > All is not lost, Mike Licht @ Modern Muscle here in Detroit(810-754-0261)
> > is in final test stages of a a/f meter that uses this sensor. Will sell
> > for $800 including the sensor. That is why Jim and I stopped work on our
> > design and are waiting for the MM meter. Interested parties can call
> > Mike @ above #
>
> I seem to remember seeing a post in the '96 or '97 archives where
> someone had scanned and posted the actual Bosch datasheets.  If I
> find that I'll let you know.
>
> Eric
> - --
> Eric Fahlgren                            Mechanical Dynamics, Inc
> efahl at adams.com                          Ann Arbor, Michigan, USA
> - --------------------------------------------------------------------------
> --
>
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