Best Deals 2/3 for 2005

... now for VAG-COM...



Finally, easily, quickly, and affordably check tuning modifications!
Is your friend's car performing better? Do a performance comparison!

-> You can also find a direct download link in the last post of this thread.
Full integration as a plugin is planned for one of the next VAG-COM versions.
That means you don't have to read in logged measurement files, but instead you will be told what to do (accelerate, coast, etc.).

Hi Rainer,

Is the DRZ (Diesel Retrograde Zylinder) built-in, or is it calculated based on the amount of injected diesel fuel, etc.?

Definitely a great idea!

Best regards,

Jan.

Hi Jan,

When it's finished, it will be a kind of diagnostic tool that works as a VAG-COM plugin.



However, it will still take some time, as I still need to continue working on the excellent foundation, which I didn't create myself.

Best regards, Rainer.

Hi Rainer,

Could you possibly reveal a little more information?

On what basis is this power and torque measurement performed? What sensor data is read during the process?

/Speculation mode on

The diagram shows the instantaneous acceleration of the vehicle. I imagine that simply reading the engine speed and instantaneous speed (from 2 control units simultaneously! Is that possible?) would be enough to generate the torque and power curves.
The acceleration can be calculated by deriving the instantaneous velocity. The ratio of engine speed to velocity provides information about the overall gear ratio. Now, all that's needed is the mass of the vehicle to calculate the torque and power.

/speculation mode on

Am I on the right track?

Regards,
Alex.

Hello Alex,

Yes, that's how it's being done currently. To ensure that the curve calculation has a more reasonable and, above all, car- and driver-independent basis, I am currently working on an 'intelligent' data processing method.
The quality of the calculated curves depends entirely on the quality of the input measurement values.

The plan is to run the program as a VAG-COM plugin.
"In other words, you click a 'Start' button and then receive instructions such as 'Please accelerate the vehicle,' 'Press the clutch and let it coast,' etc. The measurement block selection and data preparation should then happen automatically, so that a printable power and torque curve is generated directly."

Best regards, Rainer.

Rainer K. wrote:

The plan is to run the program as a VAG-COM plugin. "That is, you click a 'Start' button and then receive instructions such as 'Please accelerate the vehicle,' 'Press the clutch and let it roll,' etc. The measurement block selection and data preparation should then happen automatically, so that the printable power and torque curve is generated directly.

"
Wow, so a virtual test bench for on the go .

If this runs stably and is included in your VAGCOM version, I might be tempted to retire my old version (which has been sufficient and stable for my needs so far) along with my opto-adapter.

How is the galvanic mass connection between the car and Lappi implemented in your USB professional adapter?

0.0 Ohms, which means I could create a low-resistance ground loop when powering the laptop from the bottom panel, and in the worst-case scenario, I could burn out a ground trace leading to the USB port on the motherboard?
My Elitegroup laptop doesn't have an internal battery...

Hello Ulf,

ulf wrote:

Rainer K. wrote: The plan is to run the program as a VAG-COM plugin. "That is, you click a 'Start' button and then receive instructions such as 'Please accelerate the vehicle,' 'Press the clutch and let it coast,' etc. The measurement block selection and data preparation should then happen automatically, so that the printable power and torque curve is generated directly. " Wow, so a virtual test bench for on the go . ... How is the galvanic mass connection between the car and Lappi implemented in your USB professional adapter? ...

0.6 Ohms or 1.1 Ohms... however, so far there has been nothing grilled .
What is the voltage difference between the power cable and the ground connection of the laptop's connectors?

Best regards, Rainer.

Rainer K. wrote:

What is the potential difference between - your power cable and the ground of the connection plugs on the laptop?

I probably need to take some measurements soon.

Hi Ulf,

Two generally applicable and reliable solutions come to mind... I'll probably test option 1 for my battery-less (because the battery is broken) laptop soon.

1. Take a 12V lead-acid battery (lead-acid, if it needs to be legal) and connect your laptop to it. When the battery is fully charged, it should provide more than enough power, and it doesn't have to be large or expensive. For example, I bought a 12V 12Ah lead-acid battery for my UPS from www.pollin.de for just 15 euros, and they work great.

2. is the "noble solution." The intelligent interface shifts the real-time problem to the connection between the microcontroller and the car, so the connection between the microcontroller and the PC is less critical (correct, Rainer?). Therefore, you should be able to build a perfect USB isolator using a USB extension cable and two fast optocouplers plus driver modules. If the interface needs the 5 volts from the PC for anything, then you could add a third optocoupler that switches on only when the PC is providing 5V, using a 7805 to generate the 5V.

@Rainer: Wouldn't that actually be a good idea for the shop? As the intelligent interface becomes more widespread, the problem becomes more acute, and that would be a nice safety mechanism for the computer.

Best regards,

Jan.

Hi,

Does the decoupling issue also apply to serial diagnostic adapters (current KKL kit)?
My laptop also needs to be powered from the vehicle's electrical system - the battery has asthma .

And which versions of VAG-Com will the plugin work with?

Hi Jan, Roger,

2.) would certainly be possible, but it is not currently planned.

The performance measurement program will definitely be able to process log files from the current VAG-COM versions.
It will not work with older versions of VAG-COM because it requires certain features that the current plugin interface does not provide.

Best regards, Rainer.

Have I understood correctly that using a laptop powered directly from the building's electrical system is problematic?

My electric scooter also has a defective battery, which is why I generally have to connect it to a car adapter.

So far, it's basically working - was there anything I should have been careful about?
(I own this serial hobby interface because my laptop still has a serial port.)

best regards
herwig

Regarding the whole food/feedback story, here's what you need to know:

There are several thousand users worldwide with a current USB interface, and to my knowledge, none of them have reported the problems you are discussing in theory.

For example, I use a HEX-USB+CAN device connected to a Siemens Lifebook (B-series), powered either by an external power supply (car battery) or by the device's internal battery.

No problems at all, not even the slightest.

Hello Uwe,

How can I identify a reliable car adapter before buying it?
Is something like this adapter [Ebay link] unsuitable?

The topic of mass continues...
Okay, I'm ready. Please provide the German text you want me to translate.

...KPower - Measuring vehicle performance using a VAG-COM log file.
V3.02 BETA...

Best regards, Rainer.

Hello Rainer!

Is this a VAG-COM plugin or a standalone offline tool?
From which version can KPower be used?

Regards,
Alex.