GM AFCR parameter question
Moderators: Mangus, robertisaar, dex
GM AFCR parameter question
Should this ALDL value represent the A/F ratio the ecu is trying to achieve at all times (e.g. in both open and closed loop fuelling)? I ask because in my $74 ecu I have a flag that indicates closed loop operation and the HEGO voltages are oscillating about the switch point yet the AFCR value indicates rich
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- Author of Defs
- Posts: 962
- Joined: Sat Feb 21, 2009 3:18 pm
- Location: Camden, MI
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- Author of Defs
- Posts: 962
- Joined: Sat Feb 21, 2009 3:18 pm
- Location: Camden, MI
-
- Author of Defs
- Posts: 962
- Joined: Sat Feb 21, 2009 3:18 pm
- Location: Camden, MI
-
- Author of Defs
- Posts: 962
- Joined: Sat Feb 21, 2009 3:18 pm
- Location: Camden, MI
ok, it seems like my previous statement would hold true then... so essentially the closed loop flag means the ECM quits ignoring the O2, but it hasn't allowed the BLM to enable(kind of like when in PE mode...)
and by percentage: when i make my autotuners and histograms, i convert BLM and INT into using the range of 0-2. 128 is 1, so anything less than that will be a direct representation of exactly how far my fueling needs to be multiplied by to correct the rich condition. anything above shows how far i need to multiply to correct a lean condition...
using the equation of X/128, you'll get those numbers, but using X/1.28 would get you an actual percentage. in the end, you're getting the same numbers, so it's actually just a matter of preference.
and by percentage: when i make my autotuners and histograms, i convert BLM and INT into using the range of 0-2. 128 is 1, so anything less than that will be a direct representation of exactly how far my fueling needs to be multiplied by to correct the rich condition. anything above shows how far i need to multiply to correct a lean condition...
using the equation of X/128, you'll get those numbers, but using X/1.28 would get you an actual percentage. in the end, you're getting the same numbers, so it's actually just a matter of preference.
OK, it seems that AFCR is not the target A/R ratio as even when adjustments are made for INT the values come no where close to stoichiometric. Time for more rummaging through the code.
Looks like we're on the same page when it comes to displaying BLM; 0-2 just gives a decimal fraction so it's similar to a percentage depending on the number of decimal places.
Thanks for the responses
Looks like we're on the same page when it comes to displaying BLM; 0-2 just gives a decimal fraction so it's similar to a percentage depending on the number of decimal places.
Thanks for the responses