reading a Knock Sensor

[Bruce Plecan]

> Shaken, but not stirred ?

Or

> Well--I always envisioned the James Bond thing, too...but
> isn't a piezoelectric sensor just a crystal with a wire lead ?

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

> 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?
Bruce

> 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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