This system is a parallel system. Gas engine makes around 180hp in the FXS variant, and drives the wheels in parallel to the electric motor. Unlike the honda system that can't use the gas engine while using the electric motor, and vice versa, this system is more versatile and has a lot more top end oomf. In the honda system, you lose pretty much all torque past 45mph and good luck getting past 60 mph in any reasonable time. In this, the gas engine has plenty of power and since it works in parallel to the electric motor, you have all the power all the time.
Now at the same time, the engine can be decoupled, and thus run only on the electric motors, and while crusing, the engine is recharging the battery because of the second motor/generator. Essentially you have 3 motors attached to a planetary gear set CVT (not belt cvt) thus doing everything all at once (or at least make it seem that way, you can't actually but its close).
This is one of the reasons its the best hybrid system around, because it is truly seamless. You don't have a drop off in power like in separate systems, and you still have a psuedo ev mode unlike the mild hybrids.
