And that's exactly how the car is programmed to work. ClarityBill that is an excellent illustration and very good explanation showing the 2 examples. I see it and experience it all the time. This is also more pronounced in winter with longer warm-up times, or if you're going into a headwind, or up a long hill, or running the heater.
So for random example pretend you activate HV while you have 20 miles EV range showing, the engine will walk along at 1500 rpm for a while as the engine warms up...but during that time your EV range will drop to 19, 18, 17, maybe 16, because the load on the battery is greater than the 1500 rpm warm-up cycle can recharge it. But then finally the engine is warmed up and the computer tells it that it now needs to rev? Why? Because you hit the HV button at 20 miles of EV range remaining, and you lost 3 or 4 miles while the engine warmed. So the car essentially puts itself into a recharge mode for a while until it claims those 3 to 4 miles you lost back -- and if paying attention you will see your EV range will now very slowly climb back up to near 20 eventually, because that's where you hit the HV button. Once it gets back there the computer tells the engine to slow down, it will settle in eventually to whatever RPM the computer find necessary to maintain as close to 20 as possible. I've seen this cycle many many times, as I take a lot of long road trips...hundreds of miles long. I've found sometimes the cycle takes 20 to 40 to even 60 miles to find its level during times of high load (cruise control set at 78 mph into headwind, considerable rolling terrain, etc). And other times if you get lucky and go down a very long hill, or have cruise set just at 55 or 60 mph on flat ground, it'll recover and slow the engine down in a matter of just minutes. But until the car figures out what it thinks the ongoing load is going the be, the engine sort of "overcorrects" and the high rpm angry bees activate periodically...and may last a while.
In your first graph, you interrupted the cycle it was trying to reach by pressing EV to shut down the bees....it was a short HV drive. In the 2nd graph, the car went thru its cycle and found a level. Your HV drive was long enough for the car to effectively do this.
Those who don't drive the car regularly for longer road trips will rarely see this cycle go thru its entire range, or (like in your first graph) they may activate EV in an effort to stop the revving. There is nothing wrong with doing that, but understand it interrupts the programmed cycle, and now you've permanently lost the EV range target the car was aiming for at the time, so you now lose a few EV miles for that particular trip. Also if some people maybe only need HV for 10 miles of their 50 mile winter interstate commute. In that situation I would fully expect the car to run quietly for the first 4-5 miles, and then rev pretty darn high for those next 6 miles, for nearly very commute. The car DOES take opportunities to shut down (or notably slow down) the ICE rpms at stop lights, downhills, etc, even if revving high when under load, saving fuel. But then next time you accelerate the high revs immediately return -- and they will repeatedly return when under load, until the car finally hits the EV range/battery charge target it's aiming for...then it'll settle in. Remember the car has no idea where your destination will be, or if it's getting ready to go up, or down, or into a wind, or how fast, or when it will shut off. It just is blindly doing whatever it needs to do to hit a target charge, with no larger knowledge about your trip like you might have. So the car's logic FREQUENTLY may not follow your own logic, of what it should be doing.
As I've stated several times, some think the angry bees are annoying, or even a problem. I still maintain it is a feature, and the car is operating as designed. It's just different than a normal ICE because the car seems to rev at random times. But it's not random...it's following a program. I think many have a hard time getting their head wrapped around what it's doing. Once you understand it, it frankly makes a lot of sense IMO.
