Dual engine hybrid vehicle drive system

A dual engine hybrid vehicle drive system (10) for supplying torque to an axle is provided. The vehicle drive system (10) comprises an axle (12), a first engine (14), and a transmission (18) which couples the first engine (14) to the axle (12). The vehicle drive system (10) further comprises a second engine (20), a flywheel (22) driven by the second engine (20), an electric generator (24) driven by the flywheel (22), a generator controller (26) coupled between the electric generator (24) and a motor controller (28), and an electric motor (30) coupled to the motor controller (28). A gearbox (32) is coupled between the electric motor (30) and the axle (12).