[Idle APS/TPS Lockout]

On 2/10/2022 at 1:13 PM, Vaughan said:

Would it be possible to put an accelerator position sensor on it which is the position of the pedal, cable part of the throttle and isn't affected by the idle solenoid?

Not easily as it is an all-in-one assembly.

Playing with it some more it seems to work reasonably well and doesn't interfere with other functions that I can notice. I wouldn't say perfect but for the time being it will work and produces a stable idle. Long term will be to go to DBW.

[Idle APS/TPS Lockout]

1 hour ago, Adamw said:

So how does it reduce idle air as the engine warms up?

 

RPM lockout is added on top of idle target.  So if your idle target is 1000RPM and lockout is 1300, then idle control will become active at 2300RPM.

It can close itself off throttle, it controls the minimum throttle position. For example, say you are at 30% throttle and it is at 100% duty cycle, it doesn't grab the throttle and force it down to 15%. If you let off the throttle though it will stop it at 15%.

It can force it open up to 15%. If you held the throttle at 5% and it went to 100% duty cycle, the throttle will open to 15%.

Hope that makes sense. If not, I can grab a video of it real quick and show you.

[Idle APS/TPS Lockout]

4 minutes ago, Adamw said:

You still need some way for the ecu to know when it is meant to be controlling the idle.  If you had your TP lockout set to say greater than 5% to take care of the extra TP needed during cold start then when you are cruising along with a warmed up engine at small throttle openings the ecu it is going to be winding the throttle closed trying to take over control when you are driving.  This type of system would really need a completely new lockout strategy where the TP lockout varied with idle position or ECT to give something that would cover all common operating conditions.  Typically for nice transition in and out of idle control with no flatspots from idle ign etc you want idle control to be disabled as soon as there is the slightest touch on the pedal.  

 

Suspect accel enrichment then wouldnt work well when needed most too.  

The motor can only force open not closed so it can't really fight you. I am not using idle ignition control at the moment and don't have any issues idling except for very cold starts. Once warmed up, the controller is only opening the throttle around 2%.

Again, there is the RPM lockout which is set low, 1300 RPM. Even if the TPS lockout was 15% it would still be disabled above 1300 RPM. I would never see RPM that low while cruising.

[Idle APS/TPS Lockout]

32 minutes ago, Vaughan said:

so is the controller opening the cable operated throttle body for the idle control? You are possibly going to run into all sorts of problems like overrun fuel cut not working properly because the throttle is open and so on. One thought I have would be to setup the TPS calibration to be considered throttle closed at say 3-5% off actual closed so that your TPS sits at 0% for any idle value up to 3-5%, it may require some playing with to find which spot suits best.

Yes, the VR6 throttle body has a small motor and gears packaged along side the TPS. It doesn't move the cable when it opens, if the cable is operated it basically just catches.

There is still the RPM idle lockout so I don't think there will be any issues with the overrun fuel cut, I have it disabled at the moment though.

And yeah, messing with the TPS calibration is one option I considered.

Edit: Here is a video of it operating.

 

[Idle APS/TPS Lockout]

Hey guys, I was wondering why the max value for the idle APS/TPS lockout is 5%?

I understanding the reasoning when using conventional idle control methods but I have kind of a unique setup. I am using a VW VR6 throttle body that is cable driven but has DBW style idle control. Without getting too technical, the ECU is set to 2-wire solenoid which goes to a controller that interprets the PWM signal and controls the DC motor(not a stepper) in the throttle body. Higher duty cycle equals more throttle. The controller can open the throttle about 15%. On really cold starts it needs more than 5% throttle.

I haven't introduced idle ignition control and can probably work around this but I am still curious what the purpose of limiting this is and/or why it can't be disabled.

For those curious about the controller, see here: https://oshwlab.com/Sixline/vw-vr6-throttle-body-idle-air-controller

[VW 07K 5 Cylinder Trigger Setup]

Hey Vaughan, sorry for taking so long to reply. When I posted this I didn't have the wiring harness built yet. I got the car running this weekend and the Audi trigger mode seems to work great. Here is the trigger scope and the settings I used for anyone that might come across this in the future.

Stock_07K_TriggerScopeLog.llgx

[VW 07K 5 Cylinder Trigger Setup]

Hey everyone, I am doing a VW 07K 5 cylinder swap into a Porsche 944 using a FuryX. The engine is commonly referred to as an 07K but has many engine codes and variations.

My engine has two 5v hall effect sensors, 60-2 on the crank and a 4 tooth(2 big 2 small) setup on the intake cam. It has VVT on the intake cam only.

Can I use the 'Audi 4.2L V8 VVT' trigger mode even though this is an inline 5? If not, what would be recommended?

Thanks!

[Forum HTTPS]

Hey guys, just an FYI, your forums are not linking or redirecting to HTTPS. This is causing icons to not appear and warnings on login windows. Forcing it shows an invalid certificate.