Patent ID: 8109857

Claim:
A method of controlling an engine mount automatic shifting power transmission, the transmission hydrodynamic fluid drive device, a first reaction clutch disposed in series with the hydrodynamic fluid drive device, a variable capacity clutch disposed in parallel with the hydrodynamic fluid drive device, and an electric machine disposed in series with the hydrodynamic fluid drive device and the first reaction clutch, the method comprising: monitoring engine load; fully engaging the first gear clutch and partially engaging the variable capacity clutch when engine load is below a first predetermined value; fully engaging the first gear clutch and disengaging the variable capacity clutch when the engine load is above the first predetermined value and below a second predetermined value; partially engaging the first gear clutch and disengaging the variable capacity clutch when the engine load is above the second predetermined value; disengaging the first gear clutch and engaging a second gear clutch when engine load approaches zero; energizing the electric machine, depressurizing the hydrodynamic fluid drive device, and driving the turbine with the electric machine to partial empty the hydrodynamic fluid drive device when second gear is fully engaged and engine load is below the first predetermined value.