Techedge 2J1 error

[Drew]

Hello all

My Techedge 2J1 and DIY LD02 kit turned up ther otherday, built the display and hooked it up to the Flashscan V2 and the LD02 via a supplied serial splitter. All is working ok but I have noticed that the LD02 and the V2 show diffrent values. Also the display seems to hunt around alot more on the V2 then on the LD02.

Is there a setting I may have wrong somehere?

Here are the values.

LD02 V2
12.39 12.37
12.45 12.43
12.54 12.52
12.73 12.72
12.88 12.87
13.07 13.06
13.40 13.39
13.63 13.62
13.84 13.83
14.31 14.30
14.45 14.45
14.70 14.70
14.90 15.02
14.93 15.12
14.99 15.44
15.30 15.55
15.50 15.67
15.60 15.70
15.65 15.77
16.36 16.28
17.12 16.84
17.86 17.43
18.22 17.72

[Drew]

bootblock 2.06.02
firmware 2.06.12

Thanks

[Blacky]

It may be worth asking TechEdge if their gauge post-processes the serial data. The gauge may be applying a digital filter to smooth the values. FlashScan applies no filtering and just displays the data "as is".

Regards
Paul

[swingtan]

My understanding is that the TE displays will update at a faster rate than the V2 does, so the displayed data is slightly different if the AFR's are jumping around a bit. On steady runs, my 2J1 / LA1 setup reads pretty much the same as the V2, but can read slightly different when the AFR's are changing. So unless the data is way out, it may not be a huge issue.

There is also some setup that can be done on the 2J1 to alter the serial packet delay time. If you set it at the lowest setting, I think you get 40 frames per second, which should match the V2 nicely. Also, check the filter level in the V2 as it may be averaging the data from the last few frames and giving a slightly different reading.

Simon

[Blacky]

Also, check the filter level in the V2 as it may be averaging the data from the last few frames and giving a slightly different reading.
Simon

The filter settings in FlashScan only effect the analog wide band inputs, not the digital/serial input.

Regards
Paul

[Drew]

Ahhh ok I thought there mighthave been some filtering going on in the LD02 but wasnt quite sure.

I was more worried about the the displayes being off in the lean region like the LD02 reading 14.99 and the V2 reading 15.44 AFR. I tested the reading at a steady state by starting the car for a short time then plotting the two readings as the exhaust gasses where diluted by fresh air.

First go at the AutoVE and struggling to keep my BENs at 1.00 and I was thinking when the mixture is a little lean the BENs correction is too much causing the values to go a little too rich?

[swingtan]

The filter settings in FlashScan only effect the analog wide band inputs, not the digital/serial input.

Regards
Paul

Hmmmm....

Scan & Tune tool.....


<F6> - Device Settings.
<F6> - Logging.

The last window says.....

External Analogue/Digital Inputs:
Filter Level 1-5


So digital should not be there ? I didn't think that the digital inputs would be filtered but this would suggest they are.

[mr.prick]

Which filter level would get the analog input close to/on par with serial connection?

[Blacky]

Hmmmm....

Scan & Tune tool.....

<F6> - Device Settings.
<F6> - Logging.

The last window says.....

External Analogue/Digital Inputs:
Filter Level 1-5
So digital should not be there ? I didn't think that the digital inputs would be filtered but this would suggest they are.

In that text Analogue/Digital means "Analog to Digital Converter".
I should change it to avoid confusion.

Regards
Paul

[swingtan]

Which filter level would get the analog input close to/on par with serial connection?

It would depend on the WB unit you have. The TE runs an "Earth referenced" analogue signal, so you connect the the WB signal earth to the V2 earth and this will prevent DC earth offsets. I did a post on this for the TE a while back HERE. (http://forum.efilive.com/showthread.php?t=7604&page=2)

The TE is the only WB unit I know of that uses a referenced earth, but I haven't seen a lot of units.....


In that text Analogue/Digital means "Analog to Digital Converter".
I should change it to avoid confusion.

Regards
Paul

Yep, that sounds logical now :P

[mr.prick]

I noticed a difference of .1 AFR between serial and analog with my LC-1.
I didn't think about filtering the ADs thru the V2.
The AD filter is set to 4 now,
I assume the higher the setting the slower the response will be.:nixweiss: