Patent attributes
A combination starter-generator device includes an electric machine and a gear set configured to receive rotational input from the electric machine and from the engine and to couple the electric machine and the engine in a first power flow direction and a second power flow direction. The gear set is configured to operate in one of multiple gear ratios in the first power flow direction and at least one gear ratio in the second power flow direction. The starter-generator device further includes a clutch arrangement with at least one active clutch selectively coupled to the gear set to effect the gear ratios in the first power flow direction and in the second power flow direction. The clutch arrangement further includes at least one drag clutch to apply a drag force on the gear set to slow the electric machine.
