Members Page/Nanassy Peter/Boost Control

MembersPage/NanassyPeter/BoostControl (2006-04-23 16:29:33)

So finally,after 1 year i decided to install the N75 WGFV,and control it via VEMS.

I know from MiskaPeippos page that i have to drive this with a free injector driver.So this will provide the negative voltage,and i should wire the other pin to ignition positive?

Injector driver provides switched GND to N75 valve and in stock wiring harness 12V is provided together with injector supply.

How to configure in Megatune?

I have no exactly correct values, but you can try with ones I picked from MembersPage/Fero
- Boost conf=105 Sets PWM period to 6 (*8ms), MAP target active and reference position.
- Actuator off below this pressure=130kPa Defines lowest pressure when boostcontol starts to do something (I think AAN had a bit higher nominal pressure than 0.3bar boost achieved with wastegate spring)
Target offset=0
- choose correct channel (INJFET and proper channel with not i)
- Set boost vs. rpm and boost vs. TPS tables as you like

I have an almost bone stock AAN engine too,what PID settings worked best?

Try with following settings
- boost P=45
- boost I=27
- boost D=250
- PID integral limit=255

thanks,peter

After installing the mechanical parts and configured the ECU,i started a LLOOOONNGGG PID tuning session. I educated myself with the help of GRMracer (thanks a lot!).

Basially i used the method describer at wikipedia,tried Feros initial Boostconfig,nothing worked.after 2 hours of continous testing,i decided to make a basic test.With only P variable (ID zero) i should have a huge oscillation,while the desired target is beeing overshoot.Now that is what wont happen at all.I cant get more boost than 1 bar (200Kpa) with P only,which makes me wonder,is this really a PID control?

Please dont try to tell me what mechanical parts to check,the whole thing is allright,its a pure programming/controlling issue.

Every part of the system is STOCK,so no problems here.

I also tried to choose the best working PWM period.

with the lower (2-8),and only P max(200-255) waiting for oscillation nothing happened (max160-170kpa),and with 15msec perion and 200 P there was a slight oscillaton (200kpa + - 10kpa)

Note that the actual target was 230kpa,which was NEVER reached under the whole session.

Any suggestions are welcome, i made numerious log (10+).

http://www.vems.hu/filethingie.php?subdir=MembersPage/NanassyPeter/BC_logs

I will also try Miskas settings.