How the GS450H transmission works.

[Britprius]

For those that would like to know how the GS450H transmission works I recommend looking at the link shown below.

It shows how the engine and motor generators work to give the the apparent variation in ratios. You can play with the sliders to give various speeds, forwards, and reverse. Showing the engine variations in RPM at different speeds. Note MG1 can run in either direction and change direction depending on driving conditions. It shows there are no actual gear changes even for reverse or neutral. 

The nomograph near the bottom of the page is actually for the Prius so the revs and speeds will be different, but the principle and method used mechanically is the same.

http://eahart.com/prius/psd/

John