AW: combustion pressure sensor

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I had read the paper from SAE: 2000-01-0933 
Closed-Loop Control of Spark Advance and 
Air-Fuel Ratio in SI Engines Using Cylinder Pressure

They use very good measure equipment we can't afford.
But it brings me a very good concept of Cylinder Press and detonation:

 If knock happen, you can read irregulate wavefrom from osiiloscope via every crank angle.
Because knock make pressure at wrong crank angle while right peak pressure should be happen
about 10~20 ATDC.

Wellcome any idea.

Tyson.

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On Behalf Of Matt Beaubien
Sent: Friday, May 04, 2001 11:07 PM
To: diy_efi at diy-efi.org
Subject: Re: AW: combustion pressure sensor


Does anyone have any experience with the Optrand
sensors?  What sort of data acquisition and processing
are you using?  Do you do knock detection/indication
in real time?

As far as the strain gauge plug washer type goes,
someone mentioned that it's a knock sensor and not a
pressure sensor.  I don't know if that's really the
case.  The strain measured in the washer is an
indication of the pressure in the cylinder, and would
have to be processed to determine if a knock event
took place.  Once again, does anyone have direct
experience using this type?

Thanks,

Matt.

--- Greg Hermann <bearbvd at cmn.net> wrote:
> You might also want to check out <www.optrand.com>
> 
> Greg



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