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Article #2827Re: Engine Knock Sensor
From: Tim Drury
Date: Mon, 13 Apr 1992 20:42
Date: Mon, 13 Apr 1992 20:42
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i was under the assumption that a knock sensor was a wideband device. the GM sensor is fairly wideband. our engine would knock around 9.5 KHz but without a filter we were hearing a very low frequency (normal engine resonance i assume). i havent done this yet but my idea was to build a narrow band pass filter and demodulator (the diode & capacitor type) then do some level detection with a comparitor to determine if knock is present. the filter would be the switched cap. type with n=4 or 6. these are cheap and easy to use. let me know what you find out i would be interested in your design. -tim drury tdrury@calsun.gatech.edu
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Path: arc1-ca.pugleaf.net!sparky!uunet!spool.mu.edu!mips!swrinde!gatech!prism!gt0297a From: gt0297a@prism.gatech.EDU (Tim Drury) Newsgroups: sci.electronics Subject: Re: Engine Knock Sensor Message-ID: <54455@hydra.gatech.EDU> Date: 13 Apr 92 20:42:30 GMT Article-I.D.: hydra.54455 References: <#+8tqjm@rpi.edu> <92104.101531JDB6@psuvm.psu.edu> Distribution: na Organization: Georgia Institute of Technology Lines: 14