TomoHawk Posted February 9, 2019 Share #1 Posted February 9, 2019 I would like to build an AFR meter using an Arduino board, and I would like to know if anyone has a detailed chart of voltage v AFR for a narrow-band oxygen sensor. Yes, I searched for a long while, but you guys usually have useful engine data. There are lots of chart images, but they all look like a curvey Z, so obviously, there isn't enough detail to pick out coordinates to plot in a spreadsheet. If I had a chart or table with enough detail, I could generate a formula or a lookup table. The former would be better. It's just too bad the LCD displays are monochrome, because colour would be easier to interpret while driving, I suppose I could add some colored or RGB LEDs. thxZ Link to comment Share on other sites More sharing options...
240260280 Posted February 9, 2019 Share #2 Posted February 9, 2019 You also need to track the 12V voltage as the AFM/ECU does this and compensates for running at 11.5V to 15Vish range. Link to comment Share on other sites More sharing options...
jonbill Posted February 9, 2019 Share #3 Posted February 9, 2019 http://www.edproject.co.uk/NarrowAFR.html Link to comment Share on other sites More sharing options...
TomoHawk Posted February 9, 2019 Author Share #4 Posted February 9, 2019 (edited) Thanks, but that guy's data doesn't make sense, and he says it's not correct, especially for lambda=1. He gives 0.33V for lambda=1.0 but it should be about .45V . Then says he used a wide-band controller to get measurements from a narrow-band sensor? He also needs to change the way he explains the theory of the sensor, as he says the fuel "pulls oxygen through" for both rich and lean conditions. That's why I passed this page the first time I viewed it. Edited February 9, 2019 by TomoHawk Link to comment Share on other sites More sharing options...
Zed Head Posted February 9, 2019 Share #5 Posted February 9, 2019 15 hours ago, TomoHawk said: Yes, I searched for a long while, but you guys usually have useful engine data. There are lots of chart images, but they all look like a curvey Z, so obviously, there isn't enough detail to pick out coordinates to plot in a spreadsheet. You'll have to measure temperature also, as shown in your plot, even with a lookup table. Why use a narrow band when wide bands are available? Link to comment Share on other sites More sharing options...
TomoHawk Posted February 9, 2019 Author Share #6 Posted February 9, 2019 (edited) What are Wide Bands? Painted bands? Rubber bands? Edited February 9, 2019 by TomoHawk Link to comment Share on other sites More sharing options...
Zed Head Posted February 9, 2019 Share #7 Posted February 9, 2019 https://www.haltech.com/wideband-o2-sensors-explained/ Link to comment Share on other sites More sharing options...
TomoHawk Posted February 9, 2019 Author Share #8 Posted February 9, 2019 (edited) I'm not interested in buying electronic instrumentation from Haltech. Edited February 10, 2019 by TomoHawk Link to comment Share on other sites More sharing options...
Zed Head Posted February 9, 2019 Share #9 Posted February 9, 2019 Narrow band is very limited in application. Wide band gives you what you said you wanted. Unless you're really trying to "outdo" the engineers that didn't make narrow band sensors work for AFR measurement. Or you aren't looking for accuracy. Good luck. https://en.wikipedia.org/wiki/Oxygen_sensor#Wideband_zirconia_sensor http://www.walkerproducts.com/o2-sensor-training-guide/history/ Link to comment Share on other sites More sharing options...
TomoHawk Posted February 9, 2019 Author Share #10 Posted February 9, 2019 (edited) The so-called wide-band sensors aren't compatible with Arduino electronics. If you buy one and send it to me, I might consider using it. Edited February 10, 2019 by TomoHawk Link to comment Share on other sites More sharing options...
Zed Head Posted February 9, 2019 Share #11 Posted February 9, 2019 17 hours ago, TomoHawk said: I would like to build an AFR meter using an Arduino board, and I would like to know if anyone has a detailed chart of voltage v AFR for a narrow-band oxygen sensor. You said you wanted narrow band...? Just trying to help. Good luck. Link to comment Share on other sites More sharing options...
TomoHawk Posted February 10, 2019 Author Share #12 Posted February 10, 2019 Yes, I'll be using a Narrow-band Oxygen sensor. Link to comment Share on other sites More sharing options...
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