Start of spray in VAG-COM - what is + and what -

HI

how to read the spray start in VAG-COM.
Tax Device 028 906 021 AF at 1Z

Here, values ranging from -3.1 to 17 degrees appear.
What is before OT and what after ??

I always thought that the pump would be set to the maximum later time during the initial setup. (at least in Block 0)

Since the box is running at -3.1°C in idle mode, it must be well below the target temperature, so probably late.

However, a basic setting in Group 4 results in a target value of 17.4, and the actual value is gradually approaching this. Why is it then placed here on max frueh?

Where is my mistake?

m;

Is it too much to ask you to respond?

Please also write that you are not interested - not simply ignoring

Of course, I would like a short answer

Thank you.
m;

@dieselmartin:

You have correctly interpreted the signs, so - = late, after OT, + = early, before OT.

The area you mentioned also seems plausible. During idle (with a warm machine) and at low partial loads, the injection start is delayed significantly. As the load and engine speed increase, the injection start time must be advanced, as the injection duration increases with the amount (=load), and also to compensate for the relatively constant ignition delay.

If you switch to the basic setting mode in Group 4, then the solenoid will not be permanently activated (=max. late) as in the basic setting mode of Group 0, but will not be activated at all (=max. early). This causes the internal pressure of the pump to slowly rise to a higher value and shifts the start of spraying towards early. The achievable final value depends on many factors (fuel temperature, pump priming setting, idle speed, ...), and cannot be specified more precisely.
It is important that you notice a change towards early (nailing) when you switch to the base settings mode in Group 4.

Greetings
Alex

Super, gerne!

Yes, the initial payment in Block 4 caused the machine to sound very strange.

The EDC showed a target of 17.4 degrees, but the actual temperature only reached 15 degrees (after 150 km on the highway).

A previous test of the spray start (a city trip logged) showed that the target value was well met in normal operation.
Also, make sure the middle line is exactly in the center, even in the 000-Basic.

Only when idling does he overshoot the target by 3 degrees?!?! Instead of 3.1 degrees AFTER, it mostly comes out as 0.6 degrees BEFORE OT

Thank you.
m;

Only when idling does he overshoot the target by 3 degrees?!?! Instead of 3.1 degrees AFTER, it mostly comes out as 0.6 degrees BEFORE OT


This is because, in the idle state, the internal pressure of the pump depends on wear and tear (of the pump), diesel temperature, diesel density (basically, there are different types), wear of the fuel injector, etc. This makes it difficult for the EDC to regulate. It is important that the control loop functions properly at higher speeds (i.e., during driving).
What does the 'idle speed ratio' indicate?

See you, Gremlin

Here is already a graph:

/viewtopic.php?t=5071

http://www.luxus-wg.de/~martin/auto_bilder/spritz.gif

I still need to find the data.

Sorry, I only have the exact figures at home - they will arrive this evening - please don't forget

m;

Here are the log values.

The PWM valve seems to be stuck at 3.1% - that's how I interpret it.

http://www.luxus-wg.de/~martin/auto_bilder/LOG-01-004-xxx-xxx.zip

m;

'Although I lack the accelerator pedal position as a reference, it still looks quite good. The point where you apparently require 'last' follows the intended behavior quite well. At partial load, the start of the spray is not as critical, and in the 'push' mode, there is no spray start...'

If I get there, I'll take a ride this afternoon.

Due to the gear ratio: unfortunately, this is a bit misleading with VAG.

0% means the valve is fully energized.
100% means the valve is not energized.

This is due to the fact that the valves are grounded via PMW.
When adjusting the spray nozzle, 0% means maximum late (fully open), and 100% means maximum early (unpowered; closed).

See you, Gremlin

What I find much worse about the PWM sections:

they never cover the entire spectrum 0..100 % !!

ok, 3.1% is practically 0 - but my wastegate-ruining valve, the N75, only does 48-98%

Why not less?

The diagnosis revealed the culprit - it's clearly the 98%!?!?
It doesn't matter, it's probably going to be removed soon.

Thank you for the assessment - the positive results with Last also reassured me.

Would you be kind enough to write something more about my question regarding the Russia-Belarus border?

Thank you.
m;

What I find much worse about the PWM sections:

they never cover the entire spectrum 0..100 % !!

ok, 3.1% is practically 0 - but my wastegate-ruining valve, the N75, only does 48-98%

Why not less?


Maybe your charger isn't producing enough pressure to force the wastegate to open even further.

See you, Gremlin

Hm,

then I should take a look at Group 11 from the AHU colleagues.

However, I have already measured overswing pressures up to over 1 bar (measured using VAGCOM and a pressure gauge).

m;

what do the % mean on the N75 wastegate?

Hypothesis:

0% means outdoor air to the WG -> The motor should provide more power.

100% means full printing on the apartment -> The apartment should be opened so that the price does not continue to rise.

Based on these log files:
http://www.luxus-wg.de/~martin/auto_bilder/