basically i need the y=mx+b scalar equation for any wideband o2 sensor. I downloaded the spec sheet for the Bosch LSU 4, but can't figure the darned thing out.


so if anyone can tell me what voltage outputs are what airfuel ratios i would greatly appreciate it. I need the information because I am building my own Wideband reader.

 

http://www.widebandcommander.c...q.xls <---Right click Save As.

^^^That is from the DynoJet Wideband Commander site and it's for a Bosch LSU4.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dunc &raquo;</TD></TR><TR><TD CLASS="quote">http://www.widebandcommander.c...q.xls &lt;---Right click Save As.

^^^That is from the DynoJet Wideband Commander site and it's for a Bosch LSU4. </TD></TR></TABLE>

You are misleading him....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dunc &raquo;</TD></TR><TR><TD CLASS="quote">http://www.widebandcommander.c...q.xls &lt;---Right click Save As.

^^^That is from the DynoJet Wideband Commander site and it's for a Bosch LSU4. </TD></TR></TABLE>


wow that helps out a lot man, really thanks. i was sitting here making my own excel sheet and graphing to find out the y=mx+B.

except i have been looking at info off of innovative's forum, and i think their specs are a little different (0volts = 10.0:1 2.35v = 14.7:1 5v=20.0:1) so not sure if they were using the bosche or not.

Ok now here are some more questions if anyone wants to answer them and save me some hours of researching:


1.) The heater element in the o2 sensor, i take it this has to be heated and maintained at a certain temperature so that the oxygen ions can properly react with the elements in the sensor, what is this temperature, and what current going through the sensor is what temperature (another equation).

2.) which wires are which on the sensor?


i think i have some kind of diagram that tells me that on the bosch LSU 4 .pdf. but its on my other computer.

If all goes well and i figure this stuff out next week or so i will be building a wideband using a Spartan3 hardware microproccesor board.
( http://www.digilentinc.com/Pro...BOARD )

so the whole project will only be $100 plus the sensor.

thanks for your help again Dunc

 

why is that misleading?

as long as i get this thing built and close enough i will compare it with my friends wideband unit.

the info you gave me is going to 18 AFRs, and i think the Bosch was designed to go to 20 AFR, am I wrong? but this equation should be close enough to get me started.


Modified by hxtasy at 9:01 PM 3/4/2007

 

Because thats the voltage to air fuel ratio output given by the controller not the sensor. Its meaningless. I can show you 5 other controllers with completely different data. The voltage to afr he gave you is after the controller, you need what is going on before the controller.

You are way over your head. A lot of this information is found in Bosch's spec sheet and other stuff should be discovered from the understanding of such an item. To be frank, buy an Innovative LC-1 for $200 because whatever you are building for $100 will be worthless in comparison. If you are set on doing this, http://forum.pgmfi.org/viewtopic.php?t=12171. You should know who to talk to after reading that.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nowtype &raquo;</TD></TR><TR><TD CLASS="quote">Because thats the voltage to air fuel ratio output given by the controller not the sensor. Its meaningless. I can show you 5 other controllers with completely different data. The voltage to afr he gave you is after the controller, you need what is going on before the controller.

You are way over your head. A lot of this information is found in Bosch's spec sheet and other stuff should be discovered from the understanding of such an item. To be frank, buy an Innovative LC-1 for $200 because whatever you are building for $100 will be worthless in comparison. If you are set on doing this, http://forum.pgmfi.org/viewtopic.php?t=12171. You should know who to talk to after reading that.</TD></TR></TABLE>


i think with the Bosch LSU the equation would be y = 2x+10
x being voltage out of the sensor.

i have been reading stuff on the pgmfi forums but i posted here because I was looking for a quick answer, but I didn't see that topic so thanks. I am not over my head in this, It's just going to take some work, more than I thought but I pretty much deal with integrating various sensors and outputing them on displays all the time. I am going to make one also because the developmental board I am using can be used to control a lot of other things in my car, also this is helping me out with school. thanks for the input guys.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hxtasy &raquo;</TD></TR><TR><TD CLASS="quote">i think with the Bosch LSU the equation would be y = 2x+10
x being voltage out of the sensor.
</TD></TR></TABLE>

Um, thats not correct. You can't just hope its a certain equation and it will be. You'll figure a lot of this stuff out quickly if you actually do some development.

 

Wideband sensors are not like regular o2 sensors where you just convert the output of the sensor to a number. Wideband o2s require a controller to drive the o2 sensor. It's a pretty complex process, and the reason you see some wideband units that go through sensors left and right, because the controller doesn't work right.

 

It seems to be more common with the AEM units than with most.

From my experience, FJO, NGK, Prologger, PLX, and Motec widebands are pretty good with sensors. The rest i have used are not.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">It seems to be more common with the AEM units than with most.

From my experience, FJO, NGK, Prologger, PLX, and Motec widebands are pretty good with sensors. The rest i have used are not.</TD></TR></TABLE>

You have had problems with the Innovate unit? The one I use works flawlessly and does not go through sensors at all.

 

I haven't used any of the recent innovate stuff, but the old stuff wasn't the most reliable, back when it was the big white box.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">I haven't used any of the recent innovate stuff, but the old stuff wasn't the most reliable, back when it was the big white box.</TD></TR></TABLE>
I have a VERY old one! Its the large white one and I have no problems to report. It has gotten lots of use

 

Innovate uses the Bosch sensors that are sold and found at VW dealer !

 

i cant remember the heater temp should be exactly but i remember it ranges between 79-90.....someone who is use-ing a real time gauge on an inovative controller will tell you, cause the gauage doesnt read until the heater reaches a certain temp! the real time gauge shows that temp during warm up!!!

Remember: Bosch sensor u mentioned is linear type i belive