Zynerji wrote: ↑
Fri Dec 29, 2017 10:27 pm
MrPotatoHead wrote: ↑
Fri Dec 29, 2017 7:04 pm
PlatinumZealot wrote: ↑
Fri Dec 29, 2017 7:02 pm
It says 20 to 40hz.
Could be anything.
If it was relating to the engine rpm that is approximately 8000rpm to 16000rpm.
I know it can't be electrical frequency that is too low.
It could be a vribration frequency ramge. But that is too wide a range!
It's talking about the frequency of the MGU-H harvesting!
That sounds like it is switching between harvest and deploy at 40Hz.
You wouldn't want to use the waste gate and blow off valve, I don't think, that's wasting energy. What if they did it like thus:
100% mguk harvest goes to -> 50% battery 50% mguh, then mguh is cycling 40 times a second, being accelerated by the mguk, and recovering from the exhaust turbine and the added kinetic energy from the mguk, and putting 100% into the battery.
Im sure mguk is used on corner exit, as torque is your daddy for accelerating, so it would then have the full battery driving the mguk, with the mguh switching from the battery charging to powering the mguk.
These control schemes would be so much better if they allowed the front brake inner shrouds to house wire coils, and have magnets along the inner rim to add front wheel recovery.
So in other words...
To be charging and discharging at 40hz Implies the switching electronics are working overtime to switch between generator and motor at while the mguh turns in the same direction.
It implies net mguh battery charging during those braking periods when 2mj is already collected. The batter does no work but the mguk, mguh and power electronics are chagring it. Meaning, the mugk spins the mguh on the "up cycle" in 1/40 seconds via the power electronics.
On the "down cycle" the mugk sends current to the battery in 1/40seconds and during that same time period the mguh uses the residual momentum from the previous "up cycle" to generate current and charge the battery..
The process is likely not efficient but it is only done in times of excess when mguk
has gone over the regulated limit of 2MJ. The frequncy is so fast that the cables would basically be large radio antennae. Enough for a rival team to receive the signals and analyse the charging strategies. This is probably how Honda and the other teams figured out Mecedes' superior harvesting.
The electronic wizardry is definitely very high level to pull off precise and fast switching like this. It is easy to see why Honda never caught on to this trick right away, much less replicate it. This strategy labelled as "extra harvest" in the magazine graphs they spent nearly all of 2016 mastering it by the looks of things. Thank God Honda is so transparent to us fans!