dren wrote:Electronic rear brake bias will be allowed for the KERS harvesting part.
This goes to support the idea that the teams really do not recorver energy through braking but by engine overrrun now. With the fuel cap in place for next year, teams will likely actually use the braking for recovery.
Not at all.
Drivers often struggled with KERS equipped cars under braking when they were harvesting. As experience grew with KERS the teams found how to adjust the brake bias (manually) to compensate.
With only 400kJ to harvest the KERS issue was only on some braking sections not all.
But from next year the harvesting is doubling in power (60kW to 120kW) and will bring in 5 times the energy (2MJ vs 400kJ), which would make brake balance issues even harder to control manually.
Is it not an option to charge less than the maximum 2MJ from MGU-K? I'm not sure if the electronic brake system that was mentioned earlier means that teams would completely negate a hydraulic system to control the "friction" brakes does it? There was reference to brake mappings, similar to how they have mappings for throttle, but I imagine this would be more to control the relative rate of energy being dissipated and recovered between the "friction" brakes and MGU-K respectively.
In any case, 2MJ at a rate of 120kW, equates to 16.667s of engagement does it not? I'm not sure if there are any circuits where the drivers spend that much time braking, I remember in 2009 McLaren did not run their KER system at that years British Grand Prix (I believe that years circuit configuration was before the recent upgrade) because the time spent braking on a single lap was less than the time required to charge 400kJ of energy at a rate of 60kW (6.667s). So with no limit on the amount that the MGU-H can harvest, only on the rate (please correct me if I'm wrong) I would be leaning towards relying more on MGU-H for energy recovery rather than MGU-K?
Also could it be possible to use the MGU-H (or any kind of gear linkage to the turbo for that matter) to operate the engine ancillaries like water and oil pump?
WB I think so it could be possible to use overrun under braking to charge the current KER system, where I would expect any overrun to be offsetting the rate of energy recovery by engagement of the motor generator. Yes it would be remarkably in-efficient and I also think it would be unlikely since even todays formula has some consideration of fuel conservation during races.