saviour stivala wrote: ↑15 May 2020, 11:26
Of course there is nothing in the rule book mandating the brake pedal as the only means to put the 'MGU-H' into 'GENERATOR MODE'. That's because the 'MGU-H' have nothing to do with the brake pedal.
Apologies, I meant MGUK of course.
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There are many things that are not in the rule book mandating this and that. Yet very few dare goes to that edge of the rule book to make the car faster.
Controlling the _GUK without use of the brake pedal is nowhere near the "edge" of the rulebook and of course the M_UK is controlled entirely by the energy management system (yes the throttle input is part of the energy management system).
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The MGU-H/TURBO (compressor/turbine) combination development started to really come together after 3-4 years of development at around 2017/18. Up to around that time nobody could deploy electric power all around the lap. At around 2018 Mercedes Andy Cowell was the first to claim the ‘now we are in a position of being capable to deploy electric power all around the lap’.
If that MGU-H/TURBO combination development gains did not happen. They would not only still be unable to deploy electric power all around the lap. But not even the 2mj/lap allowed to be harvested by the MGU-K. Because the MGU-K could not on its own harvest what it is allowed too under braking. At least on most tracks. If harvesting by the MGU-K other than under braking was allowed. That problem wouldn’t exists.
That problem would still exist. 2 MJ/lap is not enough to deploy electric power to the MGUK
"all around the lap". Incidentally I don't disagree with anything you say about MGUH development.
There are at least two pieces of evidence for _GUK operation without brake pedal.
1. Look at the MGUK trace in the picture below. There are several segments where the yellow (extra harvest) trace sits horizontally below the zero (neither charging nor discharging) line. The blue trace (without extra harvest) is following the zero line in these segments.
In particular - between 25% - 35% from the beginning of the chart, there is a twisty section of track where the "extra harvest" function is deployed several times in constant speed and even accelerating zones. Clearly the driver does not require full power and the control system is loading the MGUK and charging the ES via the MGUH to avoid adding to the 2MJ/lap limit. Note the yellow line sits at a fixed level below zero during extra harvest (about 35 kW) - the extra harvest system cannot utilise the full 120 kW capability of the MGUK.
2. Lift and coast. There is no friction braking during lift and coast. Do you believe the initial "touch" on the brake pedal applies 120 kW of braking to the rear axle? This would be catastrophic when the driver needs to touch the brakes during cornering.
I know we have been here before but it would help if you could reference the section of the regulations that makes you so sure the teams are not allowed to harvest from the MGUK with
out the brake pedal.
Apologies Hollus but I believe we are covering some new ground here.