Lambda error value help

[Kyne]

Ok so newbie to tuner pro but not to tuning. I can't figure out how to set up a value for lambda error. I don't want to just put in WB/14.7 I would like a Value to return actual/requested to plot in the history table. I've been looking for days all over to get the answer and it may be the terminology that has me confused.

Btw I have an APU1 with an NGK AFX and I followed the directions in this forum to set up the channels in my ADX to read my NGK in lambda. For the commanded lambda I did just divide requested AFR by stoich but that's not an issue since it will still return a correction even when I'm in PE/AE. I think I have to do something with argument parameters but I don't understand how they work.

[RobertISaar]

WB/commanded AFR = correction multiplier. ex: 14.7 on the WB and commanding 12.5:1 would be 14.7/12.5=1.176 (need 1.176 times as much fuel as what is being used to reach target AFR)

am i reading the information you're looking for incorrectly? or does your datastream not supply commanded AFR?

[EagleMark]

Yeah you lost me?

Commanded is really a term for what you set in your bin for AFR. Should be 14.13 to 1 AFR if using E fuel, 14.7 to 1 AFR if using non ethanol.

If you can program your NGK AFX to 0-1 volt for the WB it is easier to work with in older ECM/PCM or you get huge swings that drives math nuts when doing corrections.

But I'm not getting what else your needing? Post your ADX file and try to explain again? Also post what voltages etc... the WB is programmed for.

[Kyne]

Yeah sorry I lost you guys. I literally need to know how to put two things together. (WB lambda/requested lambda) that's all. That way I can just paste the VE in excel or HPtuners and paste multiply the correction in.

[RobertISaar]

in tunerpro, create a new value, in the conversion tab, set the conversion to X/Y, set both X and Y to linked outputs and select the WB AFR value for X and commanded AFR for Y.

that should give you what you're looking for, without going into the details about histograms or adding it into the item view, etc.

[Kyne]

Thank you! All I needed! I figured it was just something easy like that

[lionelhutz]

Commanded is really a term for what you set in your bin for AFR. Should be 14.13 to 1 AFR if using E fuel, 14.7 to 1 AFR if using non ethanol.

Be careful with the AFR numbers you use. The narrowbands and widebands will both will say lambda = 1 at stoichiometric no matter what fuel is used. So, if you're using a stoimetric AFR of 14.7 in the PCM then use 14.7 for conversions and wideband setup (if wideband won't do lambda directly) no matter what fuel is used.

I've wondered lately what putting 1.0 for the stoichiometric AFR into the PCM would do. It would make the commanded AFR PID be lambda as well.

[RobertISaar]

I've wondered lately what putting 1.0 for the stoichiometric AFR into the PCM would do. It would make the commanded AFR PID be lambda as well.

run super bad and nothing could be done to fix it without a HUGE code rewrite....

with few exceptions, most masks modify AFR in steps of .1, so .9 and 1.1 lambda would be the next closest AFRs to command, which is a huge step in fuel delivered.

this is assuming you could get your BPC down low enough to have any kind of resolution there either. the VE tables would be all kinds of messed up as well.



you would absolutely need the "AFR" to be dealt with in 16 bit values(or be 8-bit and of an extremely limited range, say 0-2). target "AFR" modifier tables would need to be multipliers, not offsets.

the masks that do things natively in injector flowrate/cylinder size, do an actual cylinder airmass calculation and have % modifiers to AFR..... MIGHT be able to get away with it, but a lot of work would be involved for very little to no benefit.

[EagleMark]

I've wondered lately what putting 1.0 for the stoichiometric AFR into the PCM would do. The Stoich setting in all ECM/PCM up till 2014 vehicles is still done in AFR. So entering 1.0 would be 1.0 AFR... This is the only time I still use AFR in tuning is to set this parameter. After that it's Lambda!

[Kyne]

The Stoich setting in all ECM/PCM up till 2014 vehicles is still done in AFR. So entering 1.0 would be 1.0 AFR... This is the only time I still use AFR in tuning is to set this parameter. After that it's Lambda!

Mopars are done is FAR :)