Motorsimulation eines AZQ Motors mit Polo Steuergeräten | Posts 24+

Very cool work!!!

Thank you

The on-board computer is paying for itself now, because my son is driving more fuel-efficiently.
And the outside temperature provides an added safety margin when it gets frosty again.

Hi, where did you connect to the CAN bus? I'm connected to the radio connector and can't find some of the values. I have a Polo 9n3 without MFA. I'm using an MCP2515 with 8MHz and a speed of 100kbps for reading. Is the problem already somewhere there, or are there no outside temperature readings, etc., for me? I can read the engine speed. Thank you very much.

Hello,
I'm connected to the vehicle's drive CAN bus at the speedometer with a data rate of 500 kbps.
"I'm also using the MCP2515 with an 8MHz clock and a library where you can specify the clock rate." But if you can read values, then it should work.
Unfortunately, I cannot specify which values are transmitted through the CAN gateway to the comfort bus (at the radio) and which are not.
Currently, I have only wired the drive control bus in my test setup.

Regards,
Werner.

Not all CAN messages are available on every CAN bus.
It doesn't really make sense if the engine control unit were told which button was pressed on the radio.

Best regards, Rainer.

Thank you very much.
I've wired everything up, and it's working perfectly.

I was aware that not everything is available to everyone.
Now it makes sense that the speed setting on the comfort bus is used to control the radio volume.

Is there a list available somewhere that details the data accessible via the CAN bus?

I am missing the following in the examples:

Speed (regarding comfort, engine load, turbo boost, oil pressure, etc.).

I have noticed two inconsistencies in the code examples.

1. ATmp of Value * 10
2. When the "On" position is selected, the light output is 16.

Hello, sorry but I don't speak German .

"I've started a new R&D project on CAN-BUS security, and I'd like to install a similar panel as the one shown in your photos. I understand you used equipment from a VW Polo. If it's not too much trouble, could you please provide the reference numbers for the ECUs and the speedometer?" I'm trying to find a full set on the Internet, but it's a nightmare .

Thank you very much for your time.

Best regards,

Igor.

My onboard computer is working properly now.
However, I'm in a bit of a "strange" situation.

The distance will be calculated using your formula, but what is that value?
It looks like the CM (presumably referring to a counter or memory) is being decremented, but the value resets to approximately 2048 each time.

Do you have any ideas about this?

@Dr4g0n: Who are you referring to? In my car, the distance traveled is reported on the CAN bus in multiples of 10 meters, and the total mileage is reported in full kilometers.

Best regards, Rainer.

Yes, as far as I can tell from this quick estimate, it was dm, which is 0.1 meters.
I read the value every 15 seconds and add the difference to a variable.
And if the new value is smaller than the old value, meaning the counter restarts at zero, you need to add the maximum value to the new value *before* calculating the difference.

Best regards,
Werner.

With the formula from you, Wernernue.
text
CurrentStrecke = Byte_0x5A0_5 + (Byte_0x5A0_6 & 0x3) * 256;
It seems like the measurement is in centimeters, and the value resets to zero after reaching 2048. Since I'm traveling at approximately 200 km/h (55 m/s), I need to read the value more frequently.

I'm adding the difference to the previous value and storing it in a temporary variable. Once the value exceeds 100, the meter counter will increment by one.

"I'm getting an approximate 50% deviation. The car's speedometer shows 1 km, the phone shows 1.05 km, and the Arduino shows 0.5 km."

I should have checked first before writing here

Code:

if (rxId==0x5A0) //0x5A0 Geschwindigkeit vom ABS       {       Byte_0x5A0_1=rxBuf[1];       Byte_0x5A0_2=rxBuf[2];       Byte_0x5A0_5=rxBuf[5];       Byte_0x5A0_6=rxBuf[6];       Kmh=(Byte_0x5A0_2*256+Byte_0x5A0_1)/152;       CurrentStrecke=Byte_0x5A0_5 + (Byte_0x5A0_6 & B00000111)*256;       }

.

Code:

if (CurrentStrecke<LastStrecke) {Str=CurrentStrecke+0x0800-LastStrecke;} else {Str=CurrentStrecke-LastStrecke;}       LastStrecke = CurrentStrecke;       kms=kms + Str*0.20;  //kms in Dezimetern

So, those two bytes contain the distance traveled value.
And the distance is calculated every half-second using this formula:





The mileage displayed on the built-in onboard computer is quite accurate, being about 4% lower, but since the speedometer tends to run slightly fast, the actual mileage is probably quite close.

I hope you manage to get that sorted out.

Regards,
Werner.

Cool post!
I also have a Polo instrument cluster on the table, specifically a Polo 6N0920. I'm trying to move the water temperature gauge. Do you have any idea how to do that?
I've managed to get the RPM and km/h indicators working.

Hello Werner,

Yes, this project was fun.

According to the wiring diagram, this signal should originate from the temperature sensor G32, located in the lower left corner of the image, and connect to pin 22 of the 32-pin connector on the instrument cluster.

If I remember correctly, the coolant sensor has 4 connections, and it contains 2 sensors inside; the other one connects to the engine control unit.

Unfortunately, I can't quickly check right now whether the PIN is already assigned to my account. It's also possible, depending on the equipment, that the information is transmitted via the CAN bus, and the engine control unit generates the corresponding CAN signal.

Thank you for your information.

For the KI Polo 6N0920, I use an Arduino Nano V3 and an MCP2515 for control. The RPM, ABS, and airbag data are received via the CAN bus. The Arduino determines the speed using square wave pulses. The fuel gauge is implemented using PWM (Pulse Width Modulation).

I'm just unable to get the coolant temperature display to work. The pin you mentioned is labeled with the low coolant warning indicator on my device.
With various resistance values connected to the mass terminal, no display was visible. Can the temperature data also be provided via the CAN bus? I once sent values to ID 0x288, byte 1, but unfortunately, there was no display.
Are there perhaps other IDs?

Best regards, Werner.

Hi, great project.
I have a 2005 Polo with 54 horsepower, and I want to see the fuel consumption displayed.
Do I need the speed to calculate something, or is it enough to just display the consumption?
Thank you for your help.