Patent ID: 8328673

Claim:
An accessory drive system for a vehicle comprising: an engine; an accessory; an input member connected to said engine, such that said input member is configured to rotate at a fixed ratio relative to said engine; an output member connected to said accessory, such that said output member is configured to rotate at a fixed ratio relative to said accessory; a motor/generator; a first planetary gear set comprising a first, a second and a third gear member; a second planetary gear set comprising a first, a second and a third gear member; wherein said first member of said first planetary gear set is directly connected with said input member, said second member of said first planetary gear set is directly connected with said output member, said third member of said first planetary gear set is directly connected with said first member of said second planetary gear set, said second member of said second planetary gear set is directly connected with said motor/generator, and said third member of said second planetary gear set is directly connected with one of a stationary member, said first member of said first planetary gear set, and said second member of said first planetary gear set; and wherein output from said engine is transferable through the planetary gear sets to drive said accessory through said output member, and the speed at which said output member is driven is selectable by controlling the speed of said motor/generator.