Engine Knock Sensor

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Article #2796

#2796

From: Timothy G. Richter
Date: Mon, 13 Apr 1992 05:32

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I need to determine the output of an engine knock sensor.  As far as I
know, the knock sensor is a piezo-electric "microphone" which "listens"
for knock.  Knock occurs at 6.5kHz, and the knock sensor is (I'm guessing)
a narrow-band pass filter at 6.5khz.  Using this assumption, I'd expect
to get a 6.5kHz sine wave at the output when the sensor is exposed to knock.
I can't get engine under load to create knock, so I'm going to try using
a speaker.  Does anyone know how these sensors operate and what the output
is?  This is going to be connected to a microcontroller (68HC16) to help
with fuel injection and spark timing.

Thanks in advance for any help!

-Tim Richter
richtt@rpi.edu

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Newsgroups: sci.electronics
Path: arc1-ca.pugleaf.net!sparky!uunet!usc!rpi!richtt
From: richtt@aix.rpi.edu (Timothy G. Richter)
Subject: Engine Knock Sensor
Message-ID: <#+8tqjm@rpi.edu>
Nntp-Posting-Host: aix.rpi.edu
Organization: Rensselaer Polytechnic Institute, Troy NY
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Date: Mon, 13 Apr 1992 05:32:22 GMT
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