[NeilBlanchard]

Here's a twin motor, 4-speed electric drivetrain, with a twist:

Green Car Congress: Oerlikon Graziano launches 4-speed electric drive; up to 15% efficiency increase

The 4SED, based on Graziano’s original eDCT, uses two traction motors in a very compact powertrain which provides four speeds to allow running closer to peak efficiency – approximately 90 percent. The result is an overall efficiency improvement of up to 15 percent, which translates into increased range or improved performance for the vehicle.

“The design of the gearbox is very simple”, says Paolo Mantelli, Head of Oerlikon Graziano Performance Automotive. “The transmission’s unique configuration uses two input shafts, each driven by its own electric motor. The two motors replace the twin clutches and the synchronizers, allow pre-selection of the next gear before the previous one has been disengaged, and can synchronize shaft speeds”. The use of the traction motors also permits a reduced set of software algorithms compared to a normal automated gearbox, and since there are no hydraulics, there is no need for valve control.