Will this ever happen?

 

In MSIII yes 100% definitely, I think it's scheduled for the code 2.xx release on MSIII. The coders are writing a new clock angle algorithm thingy (way over my head) which will allow this to happen.

in MS1/2 no never ever ever.

 

I believe it has something to do with your sig quote.

 

MS3 alpha code has some awesome knock stuff going on. When Ken gets his angle clock code done, it should get even better.

 

How about 2D rpm filtering and user-adjustable frequency filtering?

 

What is knock window?

 

There is already a sensitivity vs RPM function.

That would be a hardware function of the knock conditioner. Keep in mind current MegaSquirt hardware does not include an onboard conditioner--You have to use an external box such as KnockSenseMS or a GM ESC module.

Looking for knock only at specific crank angles when it can occur. It helps to eliminate false knock signals. It can also be used to determine exactly which cylinder is knocking.

 

I plan to offer this on my next generation of Megasquirt II ECUs.

Unless of course, I have say in this.

Most definitely. The frequency will be fixed based on whether this is a 1.6 or a 1.8, and there weill user-adjustable RPM filtering.

 

Just



Now that's disappointing. I was under the assumption one of the spare analogue MS3X inputs would be able to be used to analyse the knock signal.

Relying on a KnockSenseMS is pointless, it doesn't rpm filter so you just get noise induced knock BTDT. No amount of MS trickery will stop a poor input signal.

Shame.

 

That's pretty darn cool. Does this exist in any EMS's out there, factory or aftermarket?

 

6.5 kHz bandpass filter is appropriate for the miata. And then said knock window.

I have a schematic for a simple bandpass filter somewhere. One could maybe add it on board a MS.

 

EDIT: Realized this is for MS

ProEFI has this...

 

yeah a good amount of the more expensive EMS solutions have support for knock windowing.

 

AEM has it and AEM is fairly inexpensive.

 

I meant more than megasquirt costs, which I paid about 300 after I did mine up

I use a J&S safeguard on my miata for knock detection and retarding per cylinder
Got it for a good price so I jumped on it.

 

This thread has made my upgrade to MS3 worth it. Thank You!

 

For people who don't know how knock-window works:

 

An analog input reading the knock signal won't work. It doesn't have enough sampling speed to use an analog input for knock processing.

The knock sensing will use some more sophisticated hardware - I wouldn't count out user specified frequency ranges or other features.

 

The windowing not only ID's which cylinder is knocking, it filters out noise that occurs outside said window.

 

? So how do other EMS's analyze the signal? Does the analog voltage signal go through an A/D converter and then through a DSP chip before feeding into a closed loop "burned in" timing trim?

I'm not trying to derail the discussion from MS; I'm just curious about how this stuff works.