@Michael II: Adaptionskanaele und Kuehlwasserthermometer | Posts 16+

How do you get to the stepper motor? Have you ever taken the instrument gauge out? I've been carefully observing my coolant thermometer on the traffic light. It rose very slowly, and it seemed very 'stepless'.
mcgregg

there are also those with more than 60 steps per revolution

'Let's build a gear train, then you'll hear it. You'll also see how quickly the parts can move the pointer around.'

You can also simply disconnect the battery or the connectors on the combination unit even when the indicator is at 'max'. Then the indicator will remain at 'max'.

See you, Gremlin

Hi,

btw... is there actually a reason why the fuel gauge doesn't exactly reflect the actual fuel level when the ignition is turned off?

I've seen something like that before with a Japanese car – turning off the ignition, and the fuel gauge remained exactly where it was, which makes sense, because the fuel doesn't actually decrease when the car is stationary.

Why does VW invest so much effort in having the display automatically shift to the neutral position?

Should it only be the reason to check the function of the display by verifying that it works through movement during startup?

Best regards,

Jan

Why is VW doing this? I don't know, but it's funny when all the indicator lights go off when you turn the ignition off.

Best regards, WarLord

Why does VW invest so much effort in having the display automatically shift to the neutral position?


Hard drives essentially perform a similar or identical zeroing process with the read head.

you can ask questions...

Why does VW implement a plateau function? Why do all the needles go to zero?

very simple, because for 100 years the damn displays have been set to 0 when the mills are turned off. -> human habit

If I just leave the displays as they are, Opa Eisenbart will definitely rush to the workshop and start messing around, just like when the temperature gauge goes up above 90 and down (especially with the TDI), dropping to 75. There must be something wrong. There are also plenty of people asking about the orange warning light and if someone could take a look (fog lights or windshield wipers). Ugh...

See you, Gremlin

ulf wrote:

How do you get to the stepper motor? mcgregg wrote: Have you ever played the instrument outdoors? Yep! on the 1997 Golf AFN, 2001 Ibiza ALH, and 2004 Polo ASZ – all are stepper motor instruments.

Then I fear that this will also be the case with my Octi (see signature). At VW, they are cutting costs, sometimes without regard for losses (e.g., the ASV lacks the standby oil pressure switch). And then stepper motors for the fuel and temperature gauges. These are probably cheap and not cost-effective. Well, the fuel gauge is now working properly (presumably because of that?). And when it came to displaying the temperature, the "plateau" function was probably the easiest to implement for Grandpa Eisenbart.

Then I'd like to think about how I could build my own digital water, possibly also oil, thermometer.

mcgregg

Hello,

I measured my temperature reading very precisely, using a combination of fixed resistors and potentiometers as substitutes for the sensor.

Since my display receives its data from the EDC via CAN, I only needed to fake one sender and, at the same time, I could read with VAGCOM which temperature I was actually simulating.

Display -> Actual Temperature (all in °C)

50 (Attack left) -> 52
60 -> 59
70 -> 64
80 -> 69
90 -> 75 to 110
100 -> 115
110 -> 119
120 -> 123
130 (Right-hand side attack) -> 132

I assume that the stepper motor display on most (or even all) VAG vehicles will behave in this way.

hi,
Has anyone taken this apart before?
Are you sure that it's step motors and not electromagnet-driven displays?
because the displacement would also be proportional to the excitation current.
I think that a proper stepper motor for the fuel gauge would be too expensive.
greetings

PowerSound3L wrote:

... are you absolutely sure that they are stepper motors ...

These are definitely stepper motors (see the wiring diagram excerpt from a SEAT Combi).

PowerSound3L wrote:

- Has anyone taken this apart before? Are you sure that it's step motors and not electromagnet-driven displays?

Hi,

In addition to Bertil's picture, I can say that I previously had three cars: Golf 3 (97), Ibiza (01), and Polo (04).

You don't even need to look at the number scales: if you carefully move the hands by hand, you will notice the small detents of the motors.

Furthermore, the needles in a non-powered combination gauge remain exactly where you set them, while in a rotary dial gauge, they usually tend to move towards the minimum – at least if you hold the combination gauge in its installed position.