In cylinder pressure measurement

[Don.F.Broadus at ucm.com]

diesel engines have been using this method for many years to monitor
cylinder pressure and cylinder balance. Fiber optics have even been used to
monitor the combustion event. AET of Canada has a new system called ECM
(engine condition monitor) that is based on instantaneous crankshaft angular
velocity measurements.  The ICAV approach might be something to check out
since 2 
non contacting hall effect sensors  mounted on the bellhousing measure
flywheel speed. Periodic variations in crankshaft velocity
can indicate each cylinders pressure and balance. Check out the May issue of
Diesel Progress for more info.   
 
Don
> -----Original Message-----
> From:	C. Brooks [SMTP:cbrooks1 at tqci.net]
> Sent:	Wednesday, May 12, 1999 3:02 PM
> To:	DIY_EFI Mailing List
> Subject:	In cylinder pressure measurement
> 
> Has anyone ever heard of anybody doing this? I was talking with someone
> about data acquisition systems and the subject came up while we were
> discussing methods of knock detection. I'm not to enthusiastic about being
> able to monitor A/F ratios accurately or in realtime, and our conversation
> kinda stuck with me.
> 
> If anyone's ever seen or heard about somebody performing in cylinder
> pressure measurements I'd love to hear about it. I imagine the transducers
> would have to be pretty tough, how would they mount? What kind of sample
> rate do you think would be needed? Best of all, who would make a sensor
> that
> could take the abuse???
> 
> 
> 
> Charles Brooks