Knock Detector

Technical questions, advice, sharing information etc (aircraft, engines, instruments, weather and such)
Post Reply
doreen
Pre flight checks done
Posts: 37
Joined: Fri Jan 09, 2009 7:55 am

Knock Detector

Postby doreen » Tue Jul 28, 2009 8:15 pm

I am going to test this on BMW R1200 fitted to my Zodiac CH650.
Very simple, anyone can built it for +- R20.00. Tapping with the metal part of screwdriver on the sensor will lit the LED.
knock freq. = 900/ (3.14 X piston diameter(in meters)) Works out to +-2.8Khz for the R1200.
IMG.pdf
(67.32 KiB) Downloaded 257 times
Top
User avatar
ystervark7
Woohoo 100 posts - flying high
Woohoo 100 posts - flying high
Posts: 103
Joined: Thu Apr 23, 2009 7:45 pm

Re: Knock Detector

Postby ystervark7 » Wed Jul 29, 2009 6:56 am

Looks interesting. Please keep us posted on your progress.
I would like to use this as well if it works.
Top
User avatar
Griffin
The sky is all mine
The sky is all mine
Posts: 498
Joined: Mon May 23, 2005 10:38 am
Location: Cape Town/FAFK

Re: Knock Detector

Postby Griffin » Thu Aug 06, 2009 5:59 pm

Is that sensor part of the R1200 motor or are you fitting your own piezo mic to the motor?
What is the frequency you quote? (2.8kHz) Is that the frequency of the pre-ignition "knocking" sound you are trying to detect?
Top
doreen
Pre flight checks done
Posts: 37
Joined: Fri Jan 09, 2009 7:55 am

Re: Knock Detector

Postby doreen » Fri Aug 07, 2009 1:19 pm

Sorry for the late reply. Yes, the R1200 has two knock sensors. And yes, with the info I gathered so far that is the audio freq. when knocking occurs.
Top
Post Reply

Return to “Technical Talk”

Who is online

Users browsing this forum: No registered users and 2 guests