Switching to Genboard on my Golf racer, because K-Jet isn't cutting it. Later on I will be doing forced induction, so I need room for change.
Pictures and some info:
http://proton.shadowflux.com/vwracing/
email james at shadowflux dot com
WBO2 question:
All wiring is correct, I have double checked. wbo2_pump_pw (0x63) is calibrated correctly, voltage is -0.03V. Measured Rcal at 127 ohms, so wbo2_calibration is set to 0xB0. Attached sensor to do free air calibration, command mde02, sensor heat comes up to maximum (0xE4) and O2% appears on LCD mlp07. As soon as heat is maxed, drops to 0x00, pauses then comes up to a reasonable level gradually. As soon as O2% appears on screen, value changes VERY rapidly from 20.9x% to 11.xx% to 17.xx% to 19.xx%, in no particular order. Ri stays between 0x90 and 0xAD. Any ideas what is going on here? All of this is without engine running.
More info:
Did some testing last night with 100ohm resistor method. Nernst was at 3.96V at first (nernst_dc_target=8D), raised it gradually to 0xBD to get to 4.47V. (I suspect that integral was too low, not enough to push PID error down to zero)
Intermediate nernst_dc_target values resulted in wavering (by about 0.2V, instead of the max 0.1V allowed maximum) Nernst voltage. When nernst_dc_target was raised to 0xBD, Nernst voltage was dead steady at 4.47v (maybe pump was railed at max FF?).
WBO2 testing page says I need 3.96V+0.45V=4.41V sortof steady, so lowered nernst_dc_target to 0xB7, but voltage started to waver again. With values where Nernst voltage wavers, pump value (on mlp07 of LCD) is a value such as 0xC3, jumps to FF briefly, then back down to 0xC3 (0xC3 is just an arbitrary number. actual value is above 0xC0, but I don't remember what it was).
When measuring nernst and pump-, I have varying values. I think the values i measured were bouncing between 120mv and 150mv. They are written down at home, I will post later.
I changed wbo2_pump_pidki from 0x40 to 0x20, but didn't see a difference in voltage values. Should this affect the bouncing of voltage up and down when measuring nernst (to ground) voltage and nernst to pump- voltage?
yes, it sounds like a WBO2 PID configuration issue (oscillation), because your WBO2 pump (HW) seems to react. Play with the values, especially pump_pid....
eg. try this:
- wbo2_pump_pid_kp=30
- wbo2_pump_pid_ki=80
- wbo2_pump_pid_kd=00
- wbo2_pump_pid_ilimit=80
Config
Latest/revised comments config: MembersPage/JimW/Config
Notes about subsystems (to verify/justify config variables) on pages below
- MembersPage/JimW/FuelSystem
- MembersPage/JimW/InputTrigger
- MembersPage/JimW/IgnitionOutput
- MembersPage/JimW/AirFeed
- MembersPage/JimW/Wiring
- MembersPage/JimW/Sensors
My Genboard and LCD display:
