Feature request EGO Correction add fuel only

Testing and development of Megasquirt 3

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Feature request EGO Correction add fuel only

Postby Suprazz » Sat Dec 09, 2017 6:54 pm

Hi,
I was a PRI in the last few days at the DIYAutotune/AMPEFI boot and a customer requested this and I liked the idea.

We want to be able to specify ego correction to only add fuel and not remove it. Actually, the authority number is a +/- % so if you authorize 10%, it can add up to 10% more fuel but can also remove 10% fuel too.

It would be great to be able to specify a different maximum correction authority on both add and removing fuel. Holley does that. So you can tell your ego correction to only have the right to add fuel at idle and not remove fuel.

Maybe a simple solution, for now, would be to add another menu to the ego options to specify how the authority percentage (or table) work with 3 options. It can add both and remove fuel, only add fuel, only remove fuel.

Let me know what you think.
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Re: Feature request EGO Correction add fuel only

Postby pit_celica » Sat Dec 09, 2017 7:18 pm

I think it's a good idea, but I think that the simplest way would have two input values : "Min correction %" and "Max correction %". This way you have your desired feature with only two input values.

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Re: Feature request EGO Correction add fuel only

Postby krisr » Sat Dec 09, 2017 7:37 pm

+1 for this - I think it's a great idea.
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Re: Feature request EGO Correction add fuel only

Postby Suprazz » Sun Dec 10, 2017 6:34 am

yes, best way to do it is with 2 tables. min table and max table so you can specify if you allow to remove and add fuel.
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Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
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Re: Feature request EGO Correction add fuel only

Postby prof315 » Sun Dec 10, 2017 11:11 am

This would indeed be a nice improvement and definitely just separate correction add and correction reduce with 2 tables instead of the single table we now have.
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Re: Feature request EGO Correction add fuel only

Postby LSXCutty » Tue Dec 12, 2017 4:37 am

I asked for this awhile back.

viewtopic.php?f=125&t=64830
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Re: Feature request EGO Correction add fuel only

Postby 93supercoupe » Tue Dec 12, 2017 11:15 am

great idea, ive seen it in way less capable ecu's. Fast XFI and Hydra both have it.
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Re: Feature request EGO Correction add fuel only

Postby maik21 » Thu Dec 14, 2017 11:18 pm

i used this type ego correction 8 years ago. maybe this help.

look at O2 compensation limit.
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egocor.jpg
used this eco correction in an old standalone system.
egocor.jpg (188.44 KiB) Viewed 90 times
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Re: Feature request EGO Correction add fuel only

Postby KeithBoden » Mon Dec 25, 2017 10:40 pm

Nice Commander950 screen shot, I only stopped using that ECU 2 years ago, although I had written my own tuning software to work with it in C++ and then again later in Java. I used to rely on the EGO correction a lot more then - with the MS3, I'm much happier using auto tune and all the modifiers to make the maps right and then using AFR shutdown when things go wrong instead of counting on EGO correction because the ECU didn't have the ability to model all the variables.
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