Haltech Anyone using full time closed loop tuning?
04-21-17, 03:36 PM
#1
Anyone using full time closed loop tuning?
so I began pecking at the AFR looking at logs every free afternoon 
I started thinking.. why can't we just leave the closed loop tuning on all the time so it'll adjust the values automatically?
I did just that yesterday and it works great. Turned off the max TPS and max MAP. Put the delay time to 0sec. and all you play with are PID.
just so everyone understands, PID controls the short term trim. You no longer have to mess with fuel map, boost solenoid base duty cycle, and all other closed loop function variables. When short term trim is constantly giving more or less input, it will adjust the long term trim according to long term trim "gain". You can increase or decrease this value to control how fast and how much you want the long term trim to kick in. I left my LT fuel gain at 80 and will increase it to 100 today.
PID control may seem daunting at first but it's pretty simple.
basically if you have too much P, the values will oscillate around the target like a sine wave. when you see oscillation, just decrease P by 10-20%. this isn't a rocket science. I usually start with 500 then increase or decrease by 100.
If you have too little I, the value will never reach the target. when I don't reach the target boost, or target AFR, I just increase the I until it does.
as for D, just put it to 0 and once you have P and I in ball park, give it a little value like 50.
would love to hear other experiences and tips. thanks!
I started thinking.. why can't we just leave the closed loop tuning on all the time so it'll adjust the values automatically?
I did just that yesterday and it works great. Turned off the max TPS and max MAP. Put the delay time to 0sec. and all you play with are PID.
just so everyone understands, PID controls the short term trim. You no longer have to mess with fuel map, boost solenoid base duty cycle, and all other closed loop function variables. When short term trim is constantly giving more or less input, it will adjust the long term trim according to long term trim "gain". You can increase or decrease this value to control how fast and how much you want the long term trim to kick in. I left my LT fuel gain at 80 and will increase it to 100 today.
PID control may seem daunting at first but it's pretty simple.
basically if you have too much P, the values will oscillate around the target like a sine wave. when you see oscillation, just decrease P by 10-20%. this isn't a rocket science. I usually start with 500 then increase or decrease by 100.
If you have too little I, the value will never reach the target. when I don't reach the target boost, or target AFR, I just increase the I until it does.
as for D, just put it to 0 and once you have P and I in ball park, give it a little value like 50.
would love to hear other experiences and tips. thanks!
04-22-17, 08:17 AM
#2
Full Member
It's one of the things I want to try out. Turned the long term trims on briefly with the stock PID values (ie, using Haltechs obsession for running only integral gain and no PD), but got some weird results, so turned it off. But want to set it up properly eventually.
The short term closed loop control works great, mainly because I think I have some pretty poor compensation tables that I need to retune (varies quite a bit with temperature).
The short term closed loop control works great, mainly because I think I have some pretty poor compensation tables that I need to retune (varies quite a bit with temperature).