Wastegate control with 2 solenoids

[vayne]

Hi!

My plan is to control external wastegate with 2 separate solenoids (one for the upper and one for the lower).

How is it done with Syvecs ?

Some simple advice would be nice. This is my first time for doing it that way, normally I had one solenoid only for the upper side.

-Mikko-

[pat]

Mikko,

For each wastegate you can define a Phase and an Anitphase output. Normally when running only one solenoid you'de only define the Phase output, but when you have both then you want to define the Antiphase as well. There are many ways of doing it, really depends on what you want to achieve. In essence, the boost control strategy will emit an abstract duty cycle, this doesn't directly control the valves but becomes the index point into the Phase Linearisation tables for the two outputs. A common way is for 0% strategy duty = 0% Phase duty, 100% strategy duty = 100% Phase duty, 0% strategy duty = 100% Anitphase duty, 100% strategy duty = 0% Antiphase duty. This way as the abstract duty goes up, so does the duty to one solenoid, whereas the duty to the other solenoid goes down. This may not be exactly what you want though. You may prefer to have 0% strategy = 0% Phase, 50% strategy = 0% Phase, 100% strategy = 100% Phase, 0% strategy = 100% Antiphase, 50% strategy = 0% Antiphase, 100% strategy = 0% Antiphase. This would mean that only one solenoid would be working at any given time / strategy duty. You'll need to play about with the linearisations to see what your particular setup best likes.

Hope this helps,

Pat.

[vayne]

Thanks!

I start testing those (not yet because we have still 60 cm snow...). My goal is to have 2-2.5 bar max boost as stable as possible but still able to get low boost for the first gears.

-Mikko-

[vayne]

Now I am playing with boost BUT I think I need simple advice for everything...

1. Solenoid connections

Upper:
To wastegate upper port (Phase) how do I connect solenoid ? Does it get always full boostpressure until solenoid start bleed out and starts to control boost level or does it get boost pressure not until the solenoid start bleed out, in other words from solenoid bleed out port ?

Lower:
To wastegate lower port (Anti-Phase) how do I connect solenoid ? Does it works as the upper solenoid ?

2. Syvecs SCal settings
I use 0-100% and 100-0% Phase-Antiphase. I can play with those and test BUT what other settings do I need to make to get boost control working ? Lets say I want stable 1.5 bar boost. There is so many settings and this language issue confuse me (I dont know what all setting do).

EDIT:
Some progress is happen on wastegate settings. My Phase solenoid were connected wrong and my phase-antiphase strategy does not work well on 0-100 100-0. I found suitable settings after many hours of logging.

Now the boost is finally quite stable and level what I wanted.

-Mikko-