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Author Topic: Closed loop fuel control... Map based?  (Read 1752 times)

ForceFed86

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Closed loop fuel control... Map based?
« on: March 05, 2011, 12:21:27 PM »
Just wondering if it would be difficult to add this to WW? Or if it already is. I like the idea of closed loop operation out of boost. IMO the best way to do this would be a map based "on-off switch". This way we could turn it off 100% under any type of boost.

Just a suggestion... Thanks!

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5 speed, 6/4 Bolt, 3K on rebuilt motor deck surfaced. Weisco 8.5:1 pistons, eagle rods. OEM crank, factory port 1g head, valve job, head surfaced , new valve stem seals,  3G lifters, BC 272 cams straight up, HX40 turbo, spearco FMIC. TT supra pump, 1000cc inj, E85, SD Jakal.

John_H

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Re: Closed loop fuel control... Map based?
« Reply #1 on: March 10, 2011, 01:15:46 PM »
I am sure there is some sort of configurable loop status control in WW as there is a basic but functioning one in Jackal.

I as well would like a more robust closed loop system.

More like an OEM setup, where it monitors different parameters to put it in either closed or open loop.

I suggest TPS,(similar to what we have in Jackal), boost(configurable from somewhere south of -10 vacuum to somewhere north of 10 psi, and coolant temp configurable to what temp you want it to go to closed loop.
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hakcenter

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Re: Closed loop fuel control... Map based?
« Reply #2 on: March 10, 2011, 03:48:57 PM »
Quote from: ForceFed86 on March 05, 2011, 12:21:27 PM
Just wondering if it would be difficult to add this to WW? Or if it already is. I like the idea of closed loop operation out of boost. IMO the best way to do this would be a map based "on-off switch". This way we could turn it off 100% under any type of boost.

Just a suggestion... Thanks!

jackal is done.
ww, i have an idea, that is based on o2 feedback just like how the trims are now, except the user will be responsible for setting a simple table for plotting the wbo2 output, ie 3 points probably. then the ecu can calculate between o2, know what that value is, and compare it to the fuel table, and make a decision on what to do.

it will obviously be very buggy from the get go, heh.
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Ligo12

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Re: Closed loop fuel control... Map based?
« Reply #3 on: March 10, 2011, 06:55:40 PM »
Quote from: ForceFed86 on March 05, 2011, 12:21:27 PM
Just wondering if it would be difficult to add this to WW? Or if it already is. I like the idea of closed loop operation out of boost. IMO the best way to do this would be a map based "on-off switch". This way we could turn it off 100% under any type of boost.

Just a suggestion... Thanks!

That is  how the oem does it.
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ForceFed86

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Re: Closed loop fuel control... Map based?
« Reply #4 on: March 11, 2011, 11:35:17 AM »
Quote from: Ligo12 on March 10, 2011, 06:55:40 PM
Quote from: ForceFed86 on March 05, 2011, 12:21:27 PM
Just wondering if it would be difficult to add this to WW? Or if it already is. I like the idea of closed loop operation out of boost. IMO the best way to do this would be a map based "on-off switch". This way we could turn it off 100% under any type of boost.

Just a suggestion... Thanks!

That is  how the oem does it.

If that is so, why does jakal do it based on TPS percentage? If it could be changed to TPS based then it could be changed to map based just as easily. I'd bet it's a good deal more complicated than that.
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5 speed, 6/4 Bolt, 3K on rebuilt motor deck surfaced. Weisco 8.5:1 pistons, eagle rods. OEM crank, factory port 1g head, valve job, head surfaced , new valve stem seals,  3G lifters, BC 272 cams straight up, HX40 turbo, spearco FMIC. TT supra pump, 1000cc inj, E85, SD Jakal.

hakcenter

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Re: Closed loop fuel control... Map based?
« Reply #5 on: March 11, 2011, 01:37:01 PM »
Quote from: ForceFed86 on March 11, 2011, 11:35:17 AM
If that is so, why does jakal do it based on TPS percentage? If it could be changed to TPS based then it could be changed to map based just as easily. I'd bet it's a good deal more complicated than that.

Because that was the easiest table to force open loop? TPS based is stock, theres 2 more I think.
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AMP 2 Corinthians 8:21
For we take thought beforehand and aim to be honest and absolutely above suspicion, not only in the sight of the Lord but also in the sight of men.

Busta

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Re: Closed loop fuel control... Map based?
« Reply #6 on: March 11, 2011, 05:13:11 PM »
I think the other two are airflow based and O2Trim based.
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Ligo12

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Re: Closed loop fuel control... Map based?
« Reply #7 on: March 12, 2011, 09:37:17 AM »
Quote from: ForceFed86 on March 11, 2011, 11:35:17 AM
Quote from: Ligo12 on March 10, 2011, 06:55:40 PM
Quote from: ForceFed86 on March 05, 2011, 12:21:27 PM
Just wondering if it would be difficult to add this to WW? Or if it already is. I like the idea of closed loop operation out of boost. IMO the best way to do this would be a map based "on-off switch". This way we could turn it off 100% under any type of boost.

Just a suggestion... Thanks!

That is  how the oem does it.

If that is so, why does jakal do it based on TPS percentage? If it could be changed to TPS based then it could be changed to map based just as easily. I'd bet it's a good deal more complicated than that.

I can't speak for the sd bin but when using the maf based bin it is literally that easy.
If fact when i begin tuning i force open loop in the tps table.After i get my global dialed in then i kick closed loop back on the get the deadtime 11v and 14v values and comp dialed in.I also in many cases extend closed loop to higher tps and load values than stock.What is complicated is dialing in without closed loop.
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John_H

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Re: Closed loop fuel control... Map based?
« Reply #8 on: March 12, 2011, 01:31:41 PM »
OEMs definately use more than one parameter as an on/off switch.

Usually its O2 heat, coolant temp, tps and airflow.

Some of the newer stuff is SUPER complicated based on calculated load as well as those other parameters.

My Mazdaspeed has a program from Cobb that I use to tune and believe me when I tell you its a complicated sophisticated process.
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