Juzh wrote: ↑30 Sep 2019, 09:19
another thing i've noticed is that ferrari tends to harvest a lot of energy at the end, particularly russian main straight was very obvious. They're dropping ~5kmh before braking zones (325 down to 320), compared to mercedes 0 kmh (320) and red bull 1 or 2 kmh (320 down to 318 just before braking). Interesting. Possible reason would be their ICE is so much better they can afford to do some harvesting in such places, since they're arriving at faster speeds anyway, and then use that energy in better places. Double whammy.
I agree. I first noticed this at Hochenheim last year, when AMUS published some end of straight data about Ferrari and Mercedes. I made a model and the only way I could make it fit the data for Ferrari was to have them switch to charging the ES simultaneously from MGU-K and MGU-H at the very end of the straight.This means a charge rate of around 180 or even 190kW. That’s similar to the discharge rate in electric supercharge mode. My understanding is that high charge rates are harder to manage than high discharge. Maybe this is what Ferrari get from their unusual battery configuration?
For completeness I found Mercedes switching off the MGU-K drive earlier than Ferrari and charging the ES with the MGU-K for longer, and obviously at a much lower rate.
I also note that WilliamsF1 have recently announced a battery package with two different chemistries which they claim can handle higher charge rates than a single chemistry. It’s a 200MJ unit and the claimed rates are 550KW for 20 seconds discharge 550kW for 10 seconds charge. They are lower relative rates than F1 where I think the ES is around 20MJ.
If Ferrari were using a two part battery they would probably need to have a battery management system that moved charge between the two parts. It could be that they would use the power management components in the control Electronics to do that. This would mean power flowing across the FIA monitoring sensor but not going to the MGU-K but instead returning to the ES. This would certainly look anomalous to the FIA and might prompt an investigation. There was one and the FIA were happy.
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