Accelerator characteristics AHF

hi,
I'm still working on my conversion from 1Z to AHF.
Everything seems to be going well so far (thank you again, Deus Violentia), BUT:

The 1Z accelerator pedal only transmits 82% of its full range to the control unit when fully depressed.

Okay, I have the Org AHF pedal here, but it's difficult to attach because the organ's 1Z potentiometer is operated via a cable.

Here's the translation:

"That's the problem situation. Now, my idea is to use an AFN potentiometer, or some other device actuated by a Bowden cable..."

It's certainly questionable whether the resistance values will match the expectations of the AHF company. Now, "dieselschraubercom" comes into play again...

Can anyone provide me with values for different potentiometers, or offer some other kind of assistance?

Sure, no problem.
Best regards.

Where does it go? For example, the Polo Classic has an ALH engine, and the engine mounts are compatible with the floor pan of a second-generation Golf.
But it's all very expensive together. It would be better to weld a bracket for your AHF Gaspoti.

Hello Webster,

As far as I know, there are always two potentiometers used together on the accelerator pedal, operating as a voltage divider.
I'll try to do the following.
One has approximately double the voltage of the other.
This should also be visible with VCDS (but I'm not sure which control module it's in).
You could check and record the voltage readings of the two pedals there.
Measure the total resistance of the pedals, as well as the maximum and minimum values of the grinder, and the supply voltage.

Then, perhaps, a voltage divider or parallel resistors could be used to adjust the voltages of the sensor.

I don't know if that complies with the road traffic regulations.

SG

Hello everyone,
Hello Hello!

servusssss wrote:

...Then, perhaps, one could use a voltage divider/parallel resistors to adjust the voltages of the grinder. I don't know if that also complies with the

traffic regulations.
Unfortunately, this simply won't work, as the linearity, or the logarithm of the potentiometer values, will no longer be guaranteed.
You can achieve 100% accuracy using resistance bridges, but then you will have... B. 20% "Driver preference" setting for the accelerator pedal when in idle position.
You might be able to simulate 0%/100% points with multiple resistance bridges, but then you won't have a real 50% value. B. 85% driver preference - also difficult to drive, even.
It will certainly be recognized as an error by the German VAT law.

I prefer Red's version, although it's according to... Regardless of the StVO (German Road Traffic Regulations), it will be a problem because it's a safety-critical component in a self-built system .

Best regards from Munich!

Hi, DieselBear30x.

Oh, I didn't know that they are logarithmic potentiometers .
Then it's all useless, basically.

SG

I'm not entirely sure, but to my knowledge, non-linear potentiometers are often used in those devices.
However, even with linear encoders, there remains a shift in the endpoints and a deviation from linearity.

Best regards from Munich!

Thank you very much for the suggestions!
It needs to fit into a Passat 35i. The problem is that the next available mounting points for the pedal are located at the bottom of the steering column... which means I would first have to move the bracket upwards and then sideways.
This design is both space-saving and stable, with only two attachment points.
I really don't want to drill through the firewall, as I would first have to remove the air conditioning unit and the dashboard (which I just recently reinstalled).

"That's a good tip about the ALH, but where can I get the values for it?"
Does every machine have its own specifically calibrated pedal (perhaps also for safety reasons)?
Please let me know if you have any information.

Best regards and thank you.

Here's another thought, either adding to or taking away from this .

If all else fails, ask a skilled tuner if they could implement the throttle position sensor map for a 1Z/AHU engine into the ALH engine management system.
It would definitely be more cost-effective than having to renovate everything.

Best regards from Munich!

I seem to recall that the accelerator pedal sensors were non-contact sensors based on capacitive or inductive technology. And certainly not as bosses.

Therefore, I don't believe you can solve it with a simple adjustment circuit.

Unfortunately, I can't offer any information regarding mechanical solutions or software adjustments to the pedal response curve.

Greetings.
Guste.

webster wrote:

...the 1z gas pedal only results in 82% throttle activation when fully depressed...

And are you able to proceed further with the AHF potentiometer?
Otherwise, please provide the part number of the MSTG. There were some, and that was the end of it.
pedal position sensor axis at approximately 82% in the characteristic curve.

@ Guste: I'm not sure if those are still potentiometers in the current models, but...
The affected pedal position sensor should be a potentiometer.
Information on this topic can also be found in the AFD Industriemotor documentary.

Best regards,
Micha

@ Wiesel: I'm also racking my brain about this problem. How do you know that there are characteristic curves where the characteristic line of the pedal value ends at around 82%? What's the point of that? Does the system then interpolate the rest?

Tomorrow I'll finally have my Golf IV AHF back in my possession, and then I'll check the maximum value displayed in the control module. I believe it's showing 100% for me. I'm including the part number!

Quote:

... How do you know that there are characteristic curves where the characteristic line of the pedal value ends at approximately 82%?

I've seen it often enough. I can't find a dataset that exhibits that behavior right away.

Quote:

What is this supposed to be?

Damn good question...

Quote:

Does the system then interpolate the rest?

No. Starting at 82% (assuming it was exactly 82%), the maximum driver-requested quantity limit applies. After that, nothing else happens.

Best regards,
Micha

Okay, I found something suitable.
This "quirk" was/is typical for the 85kW PD engines (AJM and similar).
Nothing is cut off on the X-axis. 85% is truly the last value.

Best regards,
Micha