Posted February 9, 20196 yr comment_567789 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 https://www.classiczcars.com/forums/topic/61574-afr-volts-chart/ Share on other sites More sharing options...
February 9, 20196 yr comment_567802 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 https://www.classiczcars.com/forums/topic/61574-afr-volts-chart/#findComment-567802 Share on other sites More sharing options...
February 9, 20196 yr comment_567811 http://www.edproject.co.uk/NarrowAFR.html Link to comment https://www.classiczcars.com/forums/topic/61574-afr-volts-chart/#findComment-567811 Share on other sites More sharing options...
February 9, 20196 yr Author comment_567851 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, 20196 yr by TomoHawk Link to comment https://www.classiczcars.com/forums/topic/61574-afr-volts-chart/#findComment-567851 Share on other sites More sharing options...
February 9, 20196 yr comment_567856 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 https://www.classiczcars.com/forums/topic/61574-afr-volts-chart/#findComment-567856 Share on other sites More sharing options...
February 9, 20196 yr Author comment_567858 What are Wide Bands? Painted bands? Rubber bands? Edited February 9, 20196 yr by TomoHawk Link to comment https://www.classiczcars.com/forums/topic/61574-afr-volts-chart/#findComment-567858 Share on other sites More sharing options...
February 9, 20196 yr comment_567859 https://www.haltech.com/wideband-o2-sensors-explained/ Link to comment https://www.classiczcars.com/forums/topic/61574-afr-volts-chart/#findComment-567859 Share on other sites More sharing options...
February 9, 20196 yr Author comment_567865 I'm not interested in buying electronic instrumentation from Haltech. Edited February 10, 20196 yr by TomoHawk Link to comment https://www.classiczcars.com/forums/topic/61574-afr-volts-chart/#findComment-567865 Share on other sites More sharing options...
February 9, 20196 yr comment_567866 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 https://www.classiczcars.com/forums/topic/61574-afr-volts-chart/#findComment-567866 Share on other sites More sharing options...
February 9, 20196 yr Author comment_567873 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, 20196 yr by TomoHawk Link to comment https://www.classiczcars.com/forums/topic/61574-afr-volts-chart/#findComment-567873 Share on other sites More sharing options...
February 9, 20196 yr comment_567875 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 https://www.classiczcars.com/forums/topic/61574-afr-volts-chart/#findComment-567875 Share on other sites More sharing options...
February 10, 20196 yr Author comment_567906 Yes, I'll be using a Narrow-band Oxygen sensor. Link to comment https://www.classiczcars.com/forums/topic/61574-afr-volts-chart/#findComment-567906 Share on other sites More sharing options...
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