In cylinder pressure measurement

[Charles Brooks]

Hhmm, OK. So I use a hall effect sensor on a toothed wheel and calculate acceration from the change in PRI as seen at the HE sensor. If I have a motor running at 5000RPM/60seconds=83.33RPS  and a DAQ with a 10KS/s sample rate I get 120 samples per revolution. Now, how would I compensate for engine loading? Acceleration would be higher in 1st gear than in 4th, it would also be higher going downhill than it would be going up. There's also internal friction to consider. Could probaby get around the friction part by using some constant, but I'm not sure how to go about the gear changes and driving conditions...

Charles Brooks


---------- Original Message ----------------------------------
From: Tom Sharpe <twsharpe at mtco.com>
Reply-To: diy_efi at efi332.eng.ohio-state.edu
Date: Wed, 12 May 1999 23:33:49 -0500

>Let's see... the piston measures combustion pressure... hooked to a rod...
hooked to a crankshaft....If we could measure crankshaft acceleration 60 times a
revolution, we could come up with some relative numbers... we need a toothed
wheel and sensor and ????... Sharpe