EDC response to short feeder interruption

Hello!!

I'm currently brainstorming ideas for a nice winter activity. My EDC doesn't have an integrated GRA (Gear Ratio Adaption) function, so I will implement it using an additional control unit.

I want to switch from a mechanical throttle pedal sensor (apparently just a 1k potentiometer and a switch) to an electronic potentiometer. The switching should be done using relays.
Does the Electronic Data Controller (EDC) detect the brief power interruption during the switching process? Is an error being triggered, or is the system even going into emergency mode?

Hi,

I believe there are 2,000 of them, as far as I remember. I have no idea if the EDC will notice.
But are you aware that your car will lose its approval certificate (ABE) because of this?

Greetings.
dieter

dieter wrote:

But are you aware that your car will lose its ABE (General Operating Permit), or ?

Of course, only for testing purposes and away from public roads!!

Quote:

Of course, only for testing purposes and away from public roads!!

Okay then.

But why don't you get a different car? It's much simpler. I enjoy crafting sometimes, but if something already exists, there's no need to reinvent the wheel.

If you absolutely want to tinker with it, I can send you a PDF of the industrial engine, which contains the exact specifications of the PWG (presumably a specific component).

Greetings.
dieter

Only vehicles with engine code 1Z and a production date of 94 or later have a GRA. However, converting to such a system would involve many changes (fuel injection pump, turbocharger, boost sensor, etc.).

A little bit of crafting is nice, isn't it?
Sure, please send it!

Quote:

Only the 1Z >=94 models have a GRA

.

Does that mean the GRA came with the HDK-ESP?

Interesting, but also understandable, especially since you were going to build new data centers anyway.

Also, I want a PDF too!

m;

@Wolfi:
You have approximately 250ms .

Best regards, Rudi.

@Rudi
Thank you! I would call that a precise answer!
250ms is a long time, it should definitely work.

dieselmartin wrote:

Does that mean that the GRA came with the HDK-ESP?

At least, after a long search, I have come to this conclusion.

Hi,

Are you sure that the pedal position sensor is just a single potentiometer? According to the service information, the electronic throttle body components (i.e., these sensors) are designed as dual potentiometers for fault tolerance. That might make things considerably more complicated.

How about the simple solution? Waeco-Tempomat that works by connecting to the accelerator pedal via a cable.

Best regards,

Jan.

Jan6K wrote:

are you sure that the pedal position sensor is only ONE potentiometer? According to the SSP (Service Information Publication), the electronic throttle body components (i.e., these sensors) are designed as dual potentiometers for fault tolerance. That might make things a lot more complicated.

Hi Jan,

In the 1.9 TDI SLP models that I'm familiar with, the PWG (wastegate) actually only has one potentiometer.

The (simplified) monitoring is performed by comparing it to the open contact.
0 Volts when the contact is open -> error.
3 volts with the contact closed -> error.

@Jan6K
According to my wiring diagram, the PWG has 4 contacts, with the potentiometer connected to 3 of them, and the fourth contact is connected to something else. The contact is made, and the idle contact is connected to one of the potentiometer terminals.

@Ulf
3 volts? According to my plan, the contact only closes a connection to ground.
I will measure that more precisely.


My only concern is that the maximum allowable current of the electronic potentiometer might be exceeded, which is 1mA.

wolfi_b wrote:

@Ulf 3 volts? According to my plan, the contact only closes a connection to ground. I will measure that

very precisely.
The voltages were assumed to be potentiometer output voltages.

If, for example, the LL contact is still closed at a potentiometer voltage of 3 volts, this is implausible -> emergency mode.

Oh, that's what you meant!

Hi,

It's amazing where VW is cutting costs. The description I have refers to a gasoline-powered E-Gas system, and I had implicitly assumed that such safety measures were completely identical.

Best regards,

Jan.

To put an end to the guesswork, I got in the car with my multimeter yesterday. The connector is cleverly hidden, and you can only access it after removing the accelerator pedal.
A 1kΩ potentiometer is installed, and there is a 1.1kΩ resistor at the wiper. The potentiometer can only be adjusted within the range of 10% to 65%. A voltage of 0.5 - 3.25V is generated at the wiper. The switching contact has a resistance of 1.1 kOhms to ground and opens shortly after being released.

Five wires come out of the connector, but there are only four after the plug. There might be a potentiometer on the unverified contact, but I haven't measured it.

Regarding the issue of 'switching time too long':

Why don't you simply use, for example, a CMOS switch?

I believe that component is called a CD4066.

It shouldn't allow too much current to flow (several tens of milliamps is what I believe it can handle).

And you could also use it to smoothly switch the idle contact.