I did get a TCU soft that is supposed to have LC enabled.
I tried getting the gearbox LC enabled by setting the selector in Sport
Holding the Brake and Press the accelerator but the engine stalled.
I noticed the ESP Off channel is not reported as Active in the Gearbox TCU channel Diagnostic Flags
I thougth maybe its because I did not used such a switch in my project so I created a function that would get active (1) when I put the Selector in Sport and I see it is Activating but having the ESP Off switch change to 1 did not help in getting the TCU to enable the LC.
What has tto be done to have this chaneel Activated??
I also know that the TCU expects the Brake pressue to be reported, is this reported with the Emulation with a predefined value by default or I have to configure the sensor for that? or anything else??
ESP state is not transmitted in the CAN stream, you can leave it empty. Emulated ABS frames have it turned off.
However, Switches / Vehicle / Brake active is important. Do you have it configured?
If the TCU would have all its requirements fulfilled, the Launch control bit in Diagnostic flags will be active. Then you can use it to activate the strategy in EMU PRO.
Dear @Maciej.Ordowski_ECUMASTER
Yes, Brake Active is wired in and was Active in the log at that time. (See screen bellow with added Brake Active channel)
How about Brake pressue, what is transmitted in the CAN stream?
Create a number with preferred value in the Project Tree and use it as a Custom value channel. Average channel is used. Perhaps this solution has some disadvantages, I don’t know…
So I tried a custom number to assign for the brake pressure and assigned 41 bar as requested by the TCU tunner.
In Sport and Manual selector mode now I am able to raise the RPMs till the Launch control rev limiter.
However I have an issue which the TCU tunner never encountered.
When I depress the brake pedal and the pressure is reported as 0 once again the car starts to move very slow (like it would be in Drive) and the car expectedly fals starts, on draggy, on a light tree etc.
I tried reporting 0-20-40 and actual NM Engine torque during launch control and nothing changed.
What I am concerned and not fully understand is why the ESP and LC channels from the DSG are not reporting anything while I Launch the car. Is this expected ?
ESP off would not appear in Diagnostic flags. In fact, I will consider to remove this one.
Driver ESP switch is used to receive the state from the frame, it is not being sent in any CAN frame from the ECU. In the ABS emulation the ESP is turned off permanently.
However, Launch control flag should be active, it indicates if the gearbox has initiated the LC procedure. Without this flag it will not work.
Are you sure the gearbox is capable to run LC? Perhaps the car which it comes from didn’t have the LC procedure in the firmware.
Sometimes it is a matter of wrong RPM (too low or too high) to meet the DSG requirements. I’ve seen such a problem in DQ250 in MQB platform.
41 bar seems to be quite low for a hard braking, perhaps it would be enough. I would set a bit more.
I’m not sure if it works in manual mode, I would leave the selector in sport for now.
I did get an appropriate tune for the gearbox adapted to mine, so LC is expected to work, I will try to increase the brake pressure and disable user ESP OFF input and see how it goes.
