RE: Knock Sensing with MACXXX ECU...

["Buchholz, Steven" <Steven.Buchholz@kla-tencor.com>]

One source of info that I've found was the Texas Instruments website.  Check
out:

http://www.ti.com/sc/docs/psheets/abstract/apps/spra039.htm

for a bit more info on how knock sensing algorithms have been devised.
Perhaps some other DSP companies might have similar information ...

HTH!
Steve Buchholz
San Jose, CA (USA)

> -----Original Message-----
> and injector placing), but one thing that has bugged me is the
> knock sensing bits. Anyone electronically and technically
> inclined have insights into how the MACXXX ECUs do the knock
> sensing? Is it simply the conditioning circuitry listening to the
> knock sensor/microphone and filtering out all frequencies below
> the "knock" and then outputing a "high signal" when the frequency
> of knock is heard? What would be the "knock frequency" of the
> MC motor? Like a high-pass filter/crossover. Or am I as usual on
> the wrong track here and should just rip open a Hitachi ECU and
> "super-reverse-engineer" from the knock input to the lines to the
> CPU top half? :)