EBC mod - Writeup
08-13-2007, 01:31 PM
#61
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Those settings werent' defaults of any kind. Default = Off
I made them up semi-aribitrarily to test for closed loop functionality.
Savington, you need to take the 6 seconds to calibrate the TPS. :smack:
In the absense of closed loop data, the MS will run open loop. If you add closed loop data in, then it will try to run closed loop, as long as your duty cycle targets are ballpark to the boost targets. I haven't played with tuning or autotuning the boost targets, but in there somewhere an autotune function and a 3D boost table. Just haven't screwed with it yet.
I made them up semi-aribitrarily to test for closed loop functionality.
Savington, you need to take the 6 seconds to calibrate the TPS. :smack:
In the absense of closed loop data, the MS will run open loop. If you add closed loop data in, then it will try to run closed loop, as long as your duty cycle targets are ballpark to the boost targets. I haven't played with tuning or autotuning the boost targets, but in there somewhere an autotune function and a 3D boost table. Just haven't screwed with it yet.
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08-13-2007, 02:12 PM
#63
Open loop boost control uses the duty cycle table. Closed loop boost control utilizes a control algorithm to minimize the difference between resulting boost from the duty cycle and the kpa target table. If the boost level, controlled by duty cycle, is out of range of the kpa target (that range defined by the closed loop kpa limit), than the closed loop feedback controller gives up and you revert all control back to the duty cycle table.
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08-13-2007, 04:26 PM
#65
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Durr. Not 200, 0.
There's a problem, though: The closed loop KPA limit won't allow itself to be set to 0, only numbers 20 or larger. Should I just set the boost KPA targets to some stupidly high number (250kpa everywhere?), and then leave the closed loop limit at 20? I'm never seeing higher than 196kpa right now, and my goal is to mimic the MBC boost curve to start, so setting all the KPA targets stupid high and leaving the limit at 20 should keep enough of a buffer to allow the MS to always use the duty cycles.
Right? :(
There's a problem, though: The closed loop KPA limit won't allow itself to be set to 0, only numbers 20 or larger. Should I just set the boost KPA targets to some stupidly high number (250kpa everywhere?), and then leave the closed loop limit at 20? I'm never seeing higher than 196kpa right now, and my goal is to mimic the MBC boost curve to start, so setting all the KPA targets stupid high and leaving the limit at 20 should keep enough of a buffer to allow the MS to always use the duty cycles.
Right? :(
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08-13-2007, 04:38 PM
#66
Sounds like it'd work decently, but I might try putting the kpa targets quite a bit lower than you will get, maybe like 130kpa, just for safety. You'll more than likely blast past that kpa target before the closed loop ebc will kick in, and once you're beyond 150kpa, you're in the clear for duty cycle only. Just an alternative thought.
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08-14-2007, 04:26 AM
#67
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Can I go to more than 100% duty cycle? :gay: This curve is getting me 13.5-14psi to 5500rpm, tapering to around 12psi at redline. Used to be 13psi, tapering to 9.5 at redline. (use my **** and you'll blow yours up, etc)
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08-15-2007, 09:02 AM
#72
Are you MS guys using the GM solenoid seeing boost fluctuation during open loop when the weather changes? I've got a Motec and am messing with boost control. I'm using open loop now to figure out the right duty cycle and will then move to closed loop when I have that figured out. It seems that in colder weather I'm getting a 1-2 psi greater boost reading than when it gets hot outside. That's at about 20 degrees cooler.
Thanks,
Frank
Thanks,
Frank
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08-15-2007, 01:55 PM
#73
Boost Czar
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If 100% isnt rasing the boost enough, change 19.5 Hz to 13Hz, should shift the entire range up/down....
FWIW Savington, to spool faster change to first two columns to something like this:
so the solenoid is always closed below your boost target for the fastest possible spool, then I give it 200RPM to reach the point where I make my peak boost and I limit it there.
If you look at your 3D map, or your logs of your DC duriong spool, the solenoid is slowly opening as your are trying to spool, which is exactly what you DONT want to do.
FWIW Savington, to spool faster change to first two columns to something like this:
so the solenoid is always closed below your boost target for the fastest possible spool, then I give it 200RPM to reach the point where I make my peak boost and I limit it there.
If you look at your 3D map, or your logs of your DC duriong spool, the solenoid is slowly opening as your are trying to spool, which is exactly what you DONT want to do.
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