Diagbox parameter meaning

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jsoap
Posts: 14
Joined: 30 Apr 2019, 15:25

Diagbox parameter meaning

Post by jsoap » 11 Aug 2019, 17:01

Hi,

looking at the Diagbox parameter readout for ECU DCM3.5_BR2 there is a parameter for each cyclinder,
"Difference in engine speed on engine cylinder 1" etc.., the description is "Difference between 2 current engine speeds", and it's measured in RPM
The xml logfiles call this "MP_ECART_REGIME_MOTEUR_CYLINDRE_MOTEUR_1" etc

Just curious as to what this can be.

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xantia_v6
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Re: Diagbox parameter meaning

Post by xantia_v6 » 11 Aug 2019, 18:38

If the cylinders are producing unequal power, the flywheel will spin faster or slower through each quadrant, and the ECU measures this.

jsoap
Posts: 14
Joined: 30 Apr 2019, 15:25

Re: Diagbox parameter meaning

Post by jsoap » 12 Aug 2019, 10:34

Thanks, that makes sense.
Do you think that it would it be reasonable to expect that, over a period of time, adding together all of the measured differences, should produce roughly the same result for each cylinder?