reading a Knock Sensor

[Programmer]

Shaken, but not stirred ?
Well--I always envisioned the James Bond thing, too...but
isn't a piezoelectric sensor just a crystal with a wire lead ?
They respond to stress and vibration--so I gathered that
the crystal actually is responding to "squeeze"-ing forces.
Lyndon.
-----Original Message-----
From: Bruce Plecan <nacelp at bright.net>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: October 11, 2000 9:50 PM
Subject: Re: reading a Knock Sensor


>Wouldn't it be shaken or squeezed?
>Bruce
>
>
>----- Original Message -----
>From: "Programmer" <nwester at eidnet.org>
>To: <gmecm at diy-efi.org>
>Sent: Monday, October 09, 2000 9:26 PM
>Subject: Re: reading a Knock Sensor
>
>
>> I thought the more you "squeezed" the crystal,
>> the more voltage output ?
>> Lyndon.
>> -----Original Message-----
>> From: Roger Heflin <rah at horizon.hit.net>
>> To: gmecm at diy-efi.org <gmecm at diy-efi.org>
>> Date: October 8, 2000 9:42 PM
>> Subject: Re: reading a Knock Sensor
>>
>>
>> >
>> >
>> >On Sun, 8 Oct 2000, Keith wrote:
>> >
>> >> I know i can get the Voltage but what does that convert to?? more
>> >> voltage = more knock???
>> >> how much is too much.?
>> >> Thanks
>> >> Keith
>> >>
>> >It does not convert.   The knock sensor is simply a microphone,
>> >everything that determines if the noise is knock is in the
>> >electronics.
>> >
>> >Most of the electronics just do filtering and measure the amount of
>> >power in a certain frequencty band, and this supposely differs by
>> >engine and placement of the sensor(s).
>> >
>> > Roger
>> >
>>
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