Acoustic Knock

garfield at pilgrimhouse.com garfield at pilgrimhouse.com
Mon Jun 1 15:38:21 GMT 1998


On Mon, 01 Jun 1998 00:00:42 PDT, "Silicon Challenged"
<expert_not at hotmail.com> wrote:

>And heavens forbid, that I was under the mistaken 
>impression that this list might be for sharing information and not for 
>twenty questions, "left as an excercise for the student" scholarly one 
>upsmanship ego trips or lectures from students.  Your elequant 
>correction is duely noted.
>
>Did you ever read in your book learning, that the GM acoustic sensor 
>actually WORKS and that perhaps the engine I am adapting it to might be 
>close enough so that all I might want to do is see if there is a way to 
>improve the performance and maybe push the envelope a little?  

Hey dude.

Just in case some of this list-grumpiness is the result of my tirades
spilling over from ION, I just wanted to say, that *maybe* (I dunno
really what was on the other person's mind), but maybe that retort you
got was partly a reaction to the spate of questions recently about stuff
that has been posted over and over again in short proximity (not your
case, of course). And ya gotta admit, the TI site IS pretty accessible.
But your point is well taken that your request could have also been
taken as trolling for others interested in same, or working on same. I
presume the guys point was that there ARE lots of cases of people asking
for something that a short trip to altavista woulda cured. Again, I been
pretty grumpy meself of late, so I can't really excuse someone else's
grumps. Just thinkin out loud, I guess.

But there was some other content to your posts other than the request
for TI info, that I wanted to follow up on. Cuz there's a hint that
somehow we may be gettin snotty about the acoustic method, and suddenly
don't think it works at all, and that ION is the only way to go. OH MAN,
all I can say is I HOPE nobody is feelin that way! ION isn't even REAL
yet! I take it that was also your point. Tis TOO true. And it's also
true that OBVIOUSLY the acoustic method works, and that better filtering
and recognition schemes would make it work even better.

I just wanna say that I'M interested in ION because it's cool tech, it's
a fun project, AND it might provide a more reliable knock detection in
especially noisy environments (not to mention the value of misfire
detection in aviation apps!), but I agree that the present WORKING
technology IS acoustic, and anyone who needs to prevent knock MUST use
it. I surely wouldn't recommend anyone run with 30# boost, and not
deploy acoustic sensing, in the hopes that ION would come along and
"save" them before they blew their engine up. (Just makin up an absurd
example to illustrate B). PULLEZE don't anyone think that way, eh? One
knock detector on the block, is worth a thousand on the bench. Heh.

So, in sum, I'd say ION and acoustic detection are close friends, not
adversaries. Hey, acoustic detection is a hard job for that PIEZO dude,
and I'm sure if ION can put him outta that job of riding on a noisy
crankcase, he'd be very happy to go back to doing equally important
vibration sensing, and good ole microphone work, and leave the knock
detection to someone else. But in the meantime, it's a hard job, but
SOMEONE's gotta do it, and that means PIEZO is the current man of the
hour. Nough said.

Gar




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