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userpike
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« on: May 17, 2013, 12:59:41 AM »
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This is a good explanation. First part is lecture and last 10 minutes is live demonstration. http://youtu.be/oRX2V6_a3dcenjoy! |
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IamwhoIam
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« Reply #1 on: May 17, 2013, 03:47:44 AM »
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What he fails to understand, or maybe it's different on US cars, is that short term is an additive correction, long term is multiplicative. Otherwise it's not a bad explanation.
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I have no logs because I have a boost gauge (makes things easier)
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nyet
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« Reply #2 on: May 17, 2013, 07:56:33 AM »
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What he fails to understand, or maybe it's different on US cars, is that short term is an additive correction, long term is multiplicative. Otherwise it's not a bad explanation.
I don't think that is true... idle correction is additive (both long and short), part correction is multiplicative (long and short)... AFAIK anyway |
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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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elRey
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« Reply #3 on: May 17, 2013, 09:03:21 AM »
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Great video .
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julex
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« Reply #4 on: May 17, 2013, 11:41:18 AM »
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I am having prolem with VCDS... what is the unit it display short term additive trims? % doesn't make sense, shouldn't it be in ms?
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phila_dot
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« Reply #5 on: May 17, 2013, 11:52:08 AM »
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I am having prolem with VCDS... what is the unit it display short term additive trims? % doesn't make sense, shouldn't it be in ms?
Percentage of fuel mass rk_w (relative fuel mass) gets translated to on time in RKTI |
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julex
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« Reply #6 on: May 19, 2013, 06:30:40 AM »
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Thanks.
What's the upper threshold (load, rpms?) for RKAT/RKAT2 being active?
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phila_dot
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« Reply #7 on: May 19, 2013, 07:27:27 PM »
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RKAT
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ml_w <= 25 kg/h (NO1)
nmot_w <= 1000 rpm (MLO1)
RKAZ
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rl_w >= 24% (RLU3) <= 48% (RLO3)
ml_w <= 90 kg/h (MLO3)
nmot_w >= 1800 rpm (NU3)
RKA
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rkat_w * (640/nmot) + rkaz_w
The 640 is N0 and nmot is really max(nmot, NRKAB), but NRKAB is 400 rpm.
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« Last Edit: May 19, 2013, 07:32:45 PM by phila_dot »
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phila_dot
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« Reply #8 on: May 19, 2013, 07:54:04 PM »
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FRAU
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ml_w >= 35 kg/h (MLU2) <= 250 kg/h (MLO2)
rl_w >= 20.25% (RLU2) <= 99.75% (RLO2)
FRAO
--------
ml_w >= 300 kg/h (MLU4)
rl_w >= 75% (RLU4)
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phila_dot
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« Reply #9 on: May 19, 2013, 08:31:23 PM »
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What he fails to understand, or maybe it's different on US cars, is that short term is an additive correction, long term is multiplicative. Otherwise it's not a bad explanation.
I don't think that is true... idle correction is additive (both long and short), part correction is multiplicative (long and short)... AFAIK anyway
Short term fuel trim (fr_w) is multiplicative. Long term fuel trim is additive (rka_w) and multiplicative (fra_w). |
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julex
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« Reply #10 on: May 20, 2013, 06:30:41 AM »
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Thanks for the thresholds!
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ABCD
Full Member
Karma: +4/-0
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Posts: 78
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« Reply #11 on: June 02, 2013, 08:38:08 PM »
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Short term fuel trim (fr_w) is multiplicative.
Long term fuel trim is additive (rka_w) and multiplicative (fra_w).
If i understand correctly, fr_w which is output of lambda controller isa called short term part. Thanks. |
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bomby
Jr. Member
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Posts: 29
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« Reply #12 on: June 10, 2013, 12:09:07 PM »
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and how to interpreter the value of FR_W? cause i see only values around 1
Or is there an other variable to log and see the actual percentage like you see in the measure blocks like vcds of the actual current sort fuel trim?
Pieter-Jan
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phila_dot
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« Reply #13 on: June 10, 2013, 01:53:14 PM »
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and how to interpreter the value of FR_W? cause i see only values around 1
Or is there an other variable to log and see the actual percentage like you see in the measure blocks like vcds of the actual current sort fuel trim?
Pieter-Jan
fr is the same variable that you see in block 33. To veiw it as a percentage: (fr-1)*100 |
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