knock setup

[Denmark]

 Hi all

I would like to know if you guys use and are confident in the Vems knock control system
I find it very difficult to setup , atleast getting the right info from it ,
Show when and react to knock

Any usefull tips to get to 100procent trust it ?

Thanks
Skassa

[Kamuto]

Hi all

I would like to know if you guys use and are confident in the Vems knock control system
I find it very difficult to setup , atleast getting the right info from it ,
Show when and react to knock

Any usefull tips to get to 100procent trust it ?

Thanks
Skassa

it works really nice :)

[mattias]

Really pleased with it, could never hear knock before ECU adjusted ignition advance. I used to run it in my Volvo B230 with gasoline,  no use now with ethanol fuel.

[VEMS]

I find it very difficult to setup , atleast getting the right info from it ,

Hello Skassa,

Could you elbarorate a bit bit on where you found the difficulties in setting it up ? Feedback like this will be very useful for us to improve/adjust the knock help page: http://vems.hu/vt/help/v3/v3_knock_control.html

Best regards, Dave

[Denmark]

Hmm

I Will try again on the next Car i have in , and follow the setup for it step by step

I thourght it was overly active and showing knock when there was No knock

I use the oe subaru knocksensor that is signal wire only , i dont know if thats a problem and i Will have to change to a 2 pole sensor ?

Thanks
Skassa

[fphil]

Could you elbarorate a bit bit on where you found the difficulties in setting it up ? Feedback like this will be very useful for us to improve/adjust the knock help page: http://vems.hu/vt/help/v3/v3_knock_control.html

I confess I had some difficulties in reading the documentation probably because I was expecting a shorter text and the usual terms and chapters for signal analysis matters (eg. LabView), per example in this case: Data acquisition, Data conditioning, Detection, Control.

In the first one, I may have put  things related to"Window" and "Band pass" and related VT outputs.

In the 2nd, "integrator", "channel gain", "channel calibration" (instead of "Knock Sampling Base Reading Calibration" )

in the 3rd "detection strategies", "1. Noise knock threshold ","2. Mean knock value"

In the 4th "ignition control", "enrichment control" (instead of " Knock sampling action settings")

The menu items may also need to be reorganized.

These are just remarks, the main point is  that the Knock function works efficiently.

[Attiska]

Hello All,
I have some suggestions too.
E.G. Now it is clear, the knock ref can upscale knock noise table.
I need to use tis, because my engine generates lot of noise about redline.
The knock noise ref says 1600. But:
- The individual knock channels maxxed out with 1024
- If I use knock noise ref as a multiplier (to cover over 790 in this situation I use 250%) the resolution of sensing divided by 2,5 isn't it?
This things generated some additional question, modification possibility:
- What is the maximum engine noise, what VEMS can handle (2048?)
- It would be very useful, if we can set in noise table the 'real' noise (above 797) value, and the individual channels could show values above 1024.

Regards: Attila

[Kamuto]

Hello All,
I have some suggestions too.
E.G. Now it is clear, the knock ref can upscale knock noise table.
I need to use tis, because my engine generates lot of noise about redline.
The knock noise ref says 1600. But:
- The individual knock channels maxxed out with 1024
- If I use knock noise ref as a multiplier (to cover over 790 in this situation I use 250%) the resolution of sensing divided by 2,5 isn't it?
This things generated some additional question, modification possibility:
- What is the maximum engine noise, what VEMS can handle (2048?)
- It would be very useful, if we can set in noise table the 'real' noise (above 797) value, and the individual channels could show values above 1024.

Regards: Attila

just lower your gain on channels..

[Attiska]

Hi Kamuto,

If I do this, I cannot achieve the knock reference average on light load (cruising at 2000-2500 rpm)

Attila