DIY_EFI Digest V5 #591

[Glenn & Debbie Woodhouse]

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.

Thanks, Glenn.

------------------------------

Date: Fri, 27 Apr 2001 06:01:21 -0400
From: Eric Fahlgren <efahl at adams.com>
Subject: Re: Part # Bosch 4-wire O2 (Autronics)

Franc Buxton wrote:

>         I have some Bosch LSM-11s. Are they anything special? I've never
even
> bothered to look up the specs thinking they were just ordinary sensors.
Should
> I do that? If so, does anyone feel inclined to tell me where to look? :>)

They are just "ordinary sensors" in that they use the same old
technology that's been used for decades, but they have a couple
of attributes which make them more desirable parts than the old
$29 universal lambda sensor.  First, they are manufactured to a
very high standard, so that the output is highly repeatable between
individual parts.  Second, Bosch actually published the response
curves relating probe temperature, voltage output and lambda (and
additionally published the relationship between probe resistance
and temperature).  A crop of cheap AFR meters has been built using
this information and are commercially available for about US$1000-1300.

Dig through the archives, you'll find all sorts of stuff.


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