Motoring curve validation

Vaibhavk · October 19, 2019, 05:40

Hello!

I am trying to validate a motoring curve. My peak pressure and expansion stroke match quite well but there is a lag for the compression stroke. What can be the reason? I tried changing the temperature and pressure for intake port and in-cylinder but no significant difference.
I am attaching the snap below. Any suggestions are welcome. Thanx!

Blanco · October 21, 2019, 08:29

Hi,

there could be an encoder error which gives a shift in the experimental crank angle, but if the exp pressure is reproduced at the beginning of the compression I would expect also some difference in peak pressure compared to this plot. I would check also the experimental compression ratio. better match the intake and compression stroke before looking at other aspects imho

MFGT · October 22, 2019, 01:24

What about stuff like crank shaft offset?

October 21, 2019, 08:29		#2
Blanco Senior Member Blanco Join Date: Mar 2009 Location: Torino, Italy Posts: 193 Rep Power: 17	Hi, there could be an encoder error which gives a shift in the experimental crank angle, but if the exp pressure is reproduced at the beginning of the compression I would expect also some difference in peak pressure compared to this plot. I would check also the experimental compression ratio. better match the intake and compression stroke before looking at other aspects imho Vaibhavk likes this.

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October 22, 2019, 01:24		#3
MFGT Senior Member Tobias Join Date: May 2016 Location: Germany Posts: 265 Rep Power: 11	What about stuff like crank shaft offset?