03-28-2015, 04:36 PM | #1 |
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AFR table
Here is a log that I took about a week ago: http://datazap.me/u/nwilging/gfy?log=0&data=1-9
I noticed that at 0% throttle, and at idle, my AFR goes up to 20. This seemed strange, so I started looking around the tables to see where it is getting this value from. Well, I can't find it anywhere.... The closest thing I can find is Fueling Primary Open Loop\Primary Open Loop Fueling table. However, idle values in this table are the normal 14.7. Where does the AFR for closed loop come from? Or is there just a corrections table that uses the values from the open loop afr table? Thanks for the help. |
03-28-2015, 05:37 PM | #2 |
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It should only show 20 when there is no fuel being injected, like on the overrun. Idle should still be around 14.7.
Open loop fueling is just the open loop commanded AFR, there are 2 closed loop compensation tables.
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03-30-2015, 02:57 PM | #3 |
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I don't think the table to adjust overrun fuel cut has been defined yet.
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03-31-2015, 03:00 PM | #4 |
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I haven't seen a table that looks like overrun fuel cut. Although I haven't really been looking either.
Right now I am trying to decipher these "conversion factors" between the OL afr table and the CL compensation tables... They're all negative numbers... |
03-31-2015, 07:34 PM | #5 | |
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Quote:
14.7 stoichiometric + (-1.0 compensation) = 13.7 target AFR There are other, undefined compensations in the ROM as well, but this is roughly how the ECU gets what AFR to target in closed loop. Also note that lean adjustment (that is, positive numbers in your table) won't do anything; you can't target anything leaner than 14.7 using the load compensation tables. Last edited by PantsDants; 03-31-2015 at 10:42 PM. |
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04-01-2015, 09:15 AM | #6 | |
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What you're saying makes way more sense though. I suppose it could be yet another table that holds the values or compensation values to lean the afr out that much... |
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04-01-2015, 12:23 PM | #7 | |
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04-01-2015, 02:39 PM | #8 | |
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I guess I am confused as to where it's finding these values. Is no fuel being injected even on deceleration? |
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04-01-2015, 03:56 PM | #9 | |
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http://www.bobistheoilguy.com/forums...Number=2876999 http://ecomodder.com/forum/showthrea...off-22374.html http://www.city-data.com/forum/autom...-coasting.html |
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04-01-2015, 05:14 PM | #10 |
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It shouldn't do it at idle, but yes the fuel injectors shut off on overrun/deceleration.
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