Shift control method for a multi-mode hybrid transmission

A method for controlling a shift sequence of a multi-mode hybrid transmission operatively connected to an engine, the method comprising:

• deactivating an offgoing clutch operable to select a first electrically-variable transmission (EVT) mode;
• actuating an oncoming clutch operable to select a second EVT mode;
• wherein transitioning from said first EVT mode to said second EVT mode is characterized by a lack of a transition through a fixed-gear (FG) mode;
• and
• wherein the engine is in an on-state during deactivation of said offgoing clutch and maintains the on-state during actuation of said oncoming clutch.

A method for executing a shift from an initial electrically-variable transmission (EVT) mode to a target EVT mode in a multi-mode, electrically-variable, hybrid transmission operable to receive power from an engine and at least one motor/generator assembly, the initial EVT mode cooperatively established by first and second clutches, and the target EVT mode cooperatively established by the first clutch and a third clutch, the method comprising:

• filling the third clutch to a predetermined pre-fill level;
• exhausting the second clutch to a predetermined fill level to thereby transition the transmission to an electric torque converter (ETC) mode;
• and
• synchronizing and engaging the third clutch to thereby transition the transmission to the target EVT mode.