lambda probe interface IC - CJ125 from Bosch

[ko4ko]

I try to measure with CJ120 bosch ic , but have some problems with RI measuring. Can U help me
Thanks in advance!

[almarto]

Hi ko4ko,

I am beginning with my project right now since I have been collecting information these last months. I come back to this post in a few days and I will comment with you how are things going. I have found a great drawback due to the lack of information by Bosch. Can you please send me any datasheet you have? I will do the same with my information. My e-mail is [email protected].

Best regards.

[ko4ko]

I'll tell with some words what I did:
LSU that I use is BOSCH...7057, IC - BOSCH CJ125 , I made a demo board with the connection exactly the same as in the CJ125 description. I use pic mcu to control the bosch ic . there are 2 analog values to measure , measuring RI is needed to control the heater.
Did U make any board with bosch IC ? , and did U succeded with measuring AFR. Aaa now I have available one working LSU controller - WBO2.
I think to compare it with mine on working car , but .....it's harder than I think to make it work properly.
The other thing that I can't understand is how to transformate the measured value /voltage 0-5V/ to AFR/ 8.0 - 18.0/

[Joco]

Where did you find CJ125 IC?

[john micheli]

I'll tell with some words what I did:
LSU that I use is BOSCH...7057, IC - BOSCH CJ125 , I made a demo board with the connection exactly the same as in the CJ125 description. I use pic mcu to control the bosch ic . there are 2 analog values to measure , measuring RI is needed to control the heater.
Did U make any board with bosch IC ? , and did U succeded with measuring AFR. Aaa now I have available one working LSU controller - WBO2.
I think to compare it with mine on working car , but .....it's harder than I think to make it work properly.
The other thing that I can't understand is how to transformate the measured value /voltage 0-5V/ to AFR/ 8.0 - 18.0/

i have several air fule meters i could match up what you did if it is simple to do. played with the bosch part back in 2003 but gave up due to bosch refusing to give up useful information. my demo board is still around here so maby i could re visit it again. every once in a while i re visit the dame thing.
regards
john m.

[ko4ko]

first excuse me for my bad English.
my exact question is about calculation of AFR. Now I'm measuring some voltage from cj125 , but I can't find anywhere formula to take the AFR from this voltage? Can U help me ?
Best regards!
Ko4ko

[john micheli]

found on tragacs.com/old/wbo2.html 7 page artical with the table to go from 0-5 to a/f
you seem to have gotten further along then we did 2 years ago i guess ill have to re visit the beast again what info did you find out about the cj125

[john micheli]

Hi ko4ko,

I am beginning with my project right now since I have been collecting information these last months. I come back to this post in a few days and I will comment with you how are things going. I have found a great drawback due to the lack of information by Bosch. Can you please send me any datasheet you have? I will do the same with my information. My e-mail is [email protected].

Best regards.

tried to get information from bosch; they are very hard to pull info from. havnt tried in 18 months tho. have a few parts but the data sheet is bad.
regards
john m.