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nyet
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« Reply #15 on: February 22, 2012, 11:08:06 AM »
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elray: i only have LALIUSH, which appears to be behind cat (secondary)... looking for primary now.
Also, you will have to find the code that causes lambda regulation to go open loop when req lambda !=1
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« Last Edit: February 22, 2012, 11:10:21 AM by nyet »
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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phila_dot
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« Reply #16 on: February 22, 2012, 12:17:50 PM »
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LALIUS : Lambda linearization
input:
USVKK_W : LSU voltage before Kat corrected
I was speaking about using the same method. LALIUS is also available on narrowband cars, but it has nothing to do with target lambda. You would be recalibrating sensor voltage to equal an incorrect lambda. Fuel trims are calculated differently though. There isn't a target sensor voltage. On wideband you would need a lean target AFR |
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rajivc666
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« Reply #17 on: February 23, 2012, 02:22:00 AM »
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While we are at the topic of economy, looking at the economy vs AFR and how steep it is towards the richer side more savings can be made by little leaning out at areas richer than stoic if you have an aggressive driving style. My stock car goes richer than 0.75 at high loads and the wideband voltage is like very close to zero, dont know how rich that is because LALIUS starts only from about 0.3v. That is like more than 40% loss of economy. I dont want to throw 40% of my fuel in cooling my engine , What a waste.  . Looks like KFFDLBTS is doing it due to bad quality of fuel I only have access to. |
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Rick
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« Reply #18 on: February 24, 2012, 07:13:17 AM »
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This is a bad way of doing it. I looked into it a while ago, when I was looking into ways to run leaner. There are too many drawbacks such as not being able to alter AFR agains load and RPM, and the effect on fuel trims.
There is no need at all to use closed loop at anything other than idle, as this is where tight control is needed due to very small amounts of air and fuel being consumed. By tuning KFLF, you should easily be able to obtain any AFR you wish at any load and RPM combination, while still maintaining closed loop at low RPM - I typically use 1800rpm as a threshold.
Rick
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Giannis
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« Reply #19 on: February 24, 2012, 07:43:01 AM »
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Rick how can you dissable closed loop control?
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rajivc666
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« Reply #20 on: February 24, 2012, 09:15:51 AM »
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Also Rick is it possible to go openloop in wideband also. Can you please give the details I am intersted.
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matchew
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« Reply #21 on: February 24, 2012, 09:54:16 AM »
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Why would you ever want to do that?
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rajivc666
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« Reply #22 on: February 24, 2012, 10:06:46 AM »
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Because I want to go leaner than 1 AFR by just modifying krkte and use it in my multimap tune using cruse control, so one of the tunes will be lean burn tune.
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phila_dot
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« Reply #23 on: February 24, 2012, 12:07:11 PM »
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Rick how can you dissable closed loop control?
Closed loop is enabled only if load exceeds the threshold in RLLRUN for the specified RPM point. This allows you to disable closed loop up to whatever load/RPM you designate by raising the threshold. Also Rick is it possible to go openloop in wideband also. Can you please give the details I am intersted.
This should also apply for wideband ECU's. |
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matchew
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« Reply #24 on: February 24, 2012, 12:27:23 PM »
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Because I want to go leaner than 1 AFR by just modifying krkte and use it in my multimap tune using cruse control, so one of the tunes will be lean burn tune.
Then do it closed loop, that's the beauty of wide band! |
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rob.mwpropane
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« Reply #25 on: February 24, 2012, 03:28:30 PM »
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Then do it closed loop, that's the beauty of wide band!
As far as everything that's been written on here, that ^^^ is not possible. ME7 hard limits fueling at lambda= 1. So running over 14.7 to be economic is not possible in closed loop unless you redefine sensor calibration via Julex method, or you can disable closed loop and fuel via Ricks method; map RLLRUN and KFLF. Julex method seems only good for narrowband, unless I missed something somewhere...  |
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This has nothing to do with cars but you can see my glorifying job at, www.MWPropane.com |
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matchew
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« Reply #26 on: February 24, 2012, 04:03:25 PM »
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As far as everything that's been written on here, that ^^^ is not possible. ME7 hard limits fueling at lambda= 1. So running over 14.7 to be economic is not possible in closed loop unless you redefine sensor calibration via Julex method, or you can disable closed loop and fuel via Ricks method; map RLLRUN and KFLF. Julex method seems only good for narrowband, unless I missed something somewhere... Oh ok then....... |
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phila_dot
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« Reply #27 on: February 24, 2012, 04:40:45 PM »
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As far as everything that's been written on here, that ^^^ is not possible. ME7 hard limits fueling at lambda= 1. So running over 14.7 to be economic is not possible in closed loop unless you redefine sensor calibration via Julex method, or you can disable closed loop and fuel via Ricks method; map RLLRUN and KFLF. Julex method seems only good for narrowband, unless I missed something somewhere... The only way I see it possible on wideband is to change sensor voltage to AFR calibration with LALIUS. USR does not exist on wideband ECU's as fuel trims a based on lamsoni_w (actual AFR) vs. lamsbg_w (target AFR) and not usvk (sensor voltage) vs. USR. |
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julex
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« Reply #28 on: February 24, 2012, 05:22:20 PM »
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The only way I see it possible on wideband is to change sensor voltage to AFR calibration with LALIUS. USR does not exist on wideband ECU's as fuel trims a based on lamsoni_w (actual AFR) vs. lamsbg_w (target AFR) and not usvk (sensor voltage) vs. USR.
Spot on. There should be LALIUS map equivalent for front sensors in WB ME unless LALIUUS is used for both sets there which would neatly solve the problem. You find it, I still have enough stuff to search for on my platform  |
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elRey
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« Reply #29 on: February 28, 2012, 07:45:54 PM »
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Proposed change to WB LALIUS, just adjusting the area around 14.7 - 15.4 voltage x-axis, AFR y-axis AFR = stock AFR2 = modified for lean  close-up on modifed area  |
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« Last Edit: February 28, 2012, 07:48:21 PM by elRey »
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