GS450h Question: In "EV" mode, do the electric motors spin the engine? [SOLVED]

[chriswfoster]

I have 2 questions:

1st: I've viewed a few different diagrams of this transmission. I don't understand how the car can be in "EV mode" with the IC-Engine OFF. What keeps the ICE from spinning backwards when its off? Or what keeps it from stalling if the MG motors apply a lot of torque?

Wouldn't the torque applied to the electric motor make the input shaft spin the opposite way?
I read that with the EV swap, you need to lock that input shaft (blue in screenshot) coming from the Engine. But with a hybrid orientation, what "locks" the input shaft in the engine? I've spun smaller engines by hand, so I know 300nm motors would definitely put some strain on it, even a V6.



2nd:Again, from this diagram it looks like the transmission gearing happens AFTER both electric motors. I don't think it's labeled in the diagram, but I think its the 2 green objects on right that look like big CVT pulleys?
I'm curious if the electric motor torque is be multiplied through the pulleys?

Sorry for my weird questions. Thanks!

[tom91]

viewtopic.php?t=617

https://openinverter.org/wiki/Lexus_GS450h_Drivetrain

EV mode Mg1 just spins so no torque goes through the first planetry set.

NO CVT - all gear sets are planetary. Gearing is only on MG2 not the engine or Mg1.

[zl3ag]

Pretty sure that in EV mode, MG1 spins in the opposite direction to MG2 but at an RPM where the engine input/output shaft is stationary, so 100% of the torque from MG1 is transferred to the ring gear and zero to the planetary carrier.

To do this the MG1 RPM is set to a certain percentage of the MG2 RPM (as MG2 RPM defines the rotation rate of the ring gear). No idea exactly what percentage is.

It's a mind blowing moment when you realise how this works (well, it was for me).