Cooling-down shutdown condition

Hello everyone,

just for the sake of it:

Does anyone know what the shutdown condition is for the afterglow on newer TDI engines? A temperature sensor seems like a reasonable solution, but I could also consider using a timer as an alternative.

With the current outdoor temperatures of 3 to 10 degrees Celsius, my ASV (Automatic Start Valve) takes approximately 4 minutes to activate, which corresponds to shutting off an oil temperature of 31...36 degrees Celsius.

I don't know the water temperature because the display doesn't go that low. Also, I can only use VAGCOM for a short time right now because the battery of my laptop is almost dead, and VAGCOM refuses to work when connected to the DC-to-AC converter, even though it's supposed to be galvanically isolated by the power supply.

Best regards,

Jan.

How do you know that it glows for 4 minutes?

Hi Ingo,

simply: LED (with a current-limiting resistor) connected in parallel to the incandescent bulbs ).

It's quite interesting because it also takes longer to preheat than it indicates with its EDC LED.

http://www.informatik.hu-berlin.de/~richling/auto/lda/

Quite low down - the top 3 LEDs are the ones (actually, it should only be one, but since the other two can't achieve their intended purpose due to the lack of a glow plug heater in my car... they're all three connected in parallel at the moment).

Best regards,

Jan.

Jan6K wrote:

Does anyone know what the shutdown condition is for the afterglow on newer TDI engines? A temperature sensor seems like a reasonable solution, but I could also consider using a timer as an alternative. Bei den aktuellen Aussentemperaturen von 3 bis 10 Grad glueht mein ASV ungefaehr 4 Minuten nach, was beim Abschalten einer Oeltemperatur von 31...36 Grad entspricht.

Hi Jan,

Based on years of observation of the glow-check LEDs in our vehicles, I believe I can say that it is primarily a timing mechanism.
Below a certain (cold) start temperature (likely related to the coolant), the engine afterglows, within a narrow temperature range of approximately 10°C. The duration of this afterglow increases the colder the engine is.
Then the maximum afterglow duration has already been reached (approximately 2 minutes for the AFN engine, and similar for the ALH engine, as you mentioned), and this duration will not be extended, even in extremely cold conditions.

My LED headlight usually turns on "exactly at the point" as we leave our town, regardless of whether it's +7°C or -15°C outside.

I seem to recall reading somewhere that it depends on a specific time (as mentioned before) and the engine speed. Once the engine reaches over 2500 RPM, the afterglow stops – that's how I remember it.

Regards,
arne

Hi,

The latter statement is only partially true. I recently had to exceed 2500 rpm due to traffic conditions (which I otherwise never do, even if the engine is still cold), and the display briefly went out and then came back on.

Best regards,

Jan.

OK, I've learned something new again.

OT: Sach mal Jan, sitzt Du denn nicht in diversen Gebäuden am Boden gefesselt rum? Oder schreibst Du uns per wap.dieselschrauber.de ?

Regards,
arne

Hi Arne,

How did you come to that conclusion?

I have internet access at home and at work, so I can write at almost any time.

Or what did you mean?

My posts are definitely not created via WAP... but rather via LAN or LAN+DSL.

Best regards,

Jan.

Hmm, I was thinking about all the student protests happening in Berlin. But if you were there, you probably would have already started streaming.

Regards,
arne

Hi Arne,

Ah!

*grin*

Just because I'm at a university doesn't mean I'm a student, right? I'm an employee, and that makes me a lecturer.

Therefore, I'm already experiencing the effects of the strike, namely that some of my lectures (partially) are cancelled, and I'm currently trying to find the most fair solutions to ensure that the striking students (who are ultimately also fighting for us) do not suffer any disadvantages as a result.

Okay, but now let's get back to the topic.

This morning, on my way to work, I stopped to do some shopping, and I stopped twice. Each time, the oil temperature was just below 60 degrees Celsius before I started driving, and each time, the afterglow lasted for about 30 seconds. So, as Ulf said, the temperature somehow factors into the calculation of the afterglow time, but not as a shutdown condition.

Best regards,

Jan.

I was just browsing.

There's only one condition for shutting it down:

- duration of the maximum afterglow (approximately 3-4 minutes).

Then there are also conditions under which the afterglow is interrupted.

- exceeding a specific fuel injection amount.
- exceeding a certain speed (referring to rotational speed)

The required afterglow time is calculated based on the coolant temperature.
My ALH glow plug ignites for about 3 seconds when the engine is warm, warms up to approximately 60°C in about 30-90 seconds, and takes 180-240 seconds to warm up when the engine is cold.

btw: it's clear that it preheats for a longer time. The spiral goes out when _readiness_ is achieved. Afterwards, the EDC enters a so-called 'readiness-glow,' meaning the glow plugs are kept on for a while because the driver first turns on their phone / applies lipstick before the rough diesel's fine motor skills become possible .

There's another variation called 'intermediate glow.' This occurs when the temperature drops during operation to the point where blue smoke is expected. Atmospheric pressure also plays a role (higher altitude means less compression pressure!). So, if you're slowly driving along the high plateau, it's quite possible that the glow plug system might need to activate occasionally.

CU Gremlin.

Jan6K wrote:

I don't know the water temperature because the display doesn't go that low. Also, I can only use VAGCOM for a short time right now because the battery of my laptop is almost dead, and VAGCOM refuses to work when connected to the DC-to-AC converter, even though it's supposed to be galvanically isolated by the power supply.

Why does your laptop need AC power?

Okay, for me, VAG also works with car charging cables.
I can't imagine that this could have any impact on programs.

Or have I misunderstood something?

Best regards.

Some modern technological marvels require more than 12-14V at their input.
If he has something like that...

CU Gremlin.

Okay, I've broken it down, focusing on the topic of laptops.

Unfortunately, it didn't work as expected, which is what you'd expect from software.

Jan also wrote the following:


Subject: Regarding: What you, Gremlin, write perfectly aligns with the observations at ASV. Only the last-mentioned glow plug is one I've never had, but it's good that you mention it, not that it would surprise me .

By the way, even when the oil temperature is quite high (above 75 degrees), the ASV (Automatic Shut-off Valve) doesn't glow at all, not even for 3 seconds.



CU Gremlin.

Okay. My electric vehicle needs an input voltage of 20V.

However, that's what the charging connector is for.
switchable up to 24 V.

But it doesn't matter.
That wasn't the topic.