VVT target to allow negative values

[ElDominio]

4B11 VVT issues: positive duty makes Exhaust VVT go negative

As title says, that happens, but VVT angle cannot be negative. Need to target negative angle since this is expected operation

[rusefillc]

duty? angle? I am very confused

tune URL is best

[ElDominio]

https://rusefi.com/online/index.php?vehicleName=Lancer+NotEvo+fifrst&user_id=675&sorts[uploadedMsq]=-1&sorts[uploadedLog]=-1

Increasing exhaust VVT duty makes the VVT angle go into negative numbers (when idling at 0 degrees)

[rusefillc]

@ElDominio what is "actual behaviour" and what is "expected behaviour"

I am starting to wonder if that's about VVT target table not allowing negative values

Are you asking for VVT target to start accepting negative values?

[ElDominio]

Correct, that would be best

[rusefillc]

just a reminer that you would need to lower PID min value to include your negative range

[mck1117]

there's a other step, the control is reversed for his exhaust cam

[rusefillc]

For reversed control do we simply use negative P?

[mck1117]

For reversed control do we simply use negative P?

It's much more user friendly to not do that.

[mck1117]

just a reminer that you would need to lower PID min value to include your negative range

PID min is the min output - not the min target

[rusefillc]

https://github.com/rusefi/ts-issues/issues/52

[ElDominio]

https://rusefi.com/online/view.php?log=967

VVT exhaust angle target is negative, PID max and min are 90 and -90 respectively. No change in VVT angle, VVT direction for exhaust is set to "retard"

https://rusefi.com/online/view.php?log=968

This log has VVT direction set to "advance", and once the target is changed to a positive value(at about 30s), actual VVT goes rapidly towards -40 (max VVT angle on exhaust), I assume because the PID is seeing it get farther and farther away from +10 (the target) .

[ElDominio]

👀