reading a Knock Sensor

[Programmer]

>To have a current flow wouldn't it need two?<<

Apparently not. Just one crystal in the KS.

>> They respond to stress and vibration--so I gathered that
>> the crystal actually is responding to "squeeze"-ing forces.
Stress can happen without vibration thou<<.

>Yes?<

Ummm..Yes--stress can happen without vibration--that's where
the squeeze comes in...gonna have to strip one down and
microscope it...without splitting hairs, the engine KS is sensing
vibration generated from noise.

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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