System and method for optimizing engine torque on axle disconnect during limited battery power for hybrid vehicle

A method for operating a powertrain control system for a range extended electric vehicle (REEV), the REEV having an internal combustion engine (ICE), a first electric motor associated with a first drive axle, and a second electric motor associated with a second drive axle, and a disconnect device having a first rotatable member coupled to the second electric motor and a second rotatable member coupled to the second drive axle, wherein the disconnect device moves between open and closed positions to communicate rotatable movement between the second electric motor and the second drive axle, the method comprising:

• commanding, at a controller, the disconnect device to one of open and close;
• determining, at the controller, a target motor speed for the second electric motor;
• determining, at the controller, a motor speed profile and a lead profile for the second electric motor;
• commanding, at the controller, a motor torque to the second electric motor based on the determined motor speed profile and the lead profile;
• and
• commanding, at the controller, an engine torque to the ICE, wherein the commanded motor torque and engine torque facilitate a synching speed of the first and second rotatable members at the disconnect device.