Abstract: This disclosure relates to a hybrid electrical drive system for a vehicle, and in particular, to a conversion kit for converting a vehicle with a standard internal combustion engine into a hybrid electrical vehicle. The conversion kit is designed to increase the fuel efficiency and travel range of the vehicle so converted, and to provide additional horse power upon acceleration. The system utilizes a novel arrangement to intercept kinetic energy that would normally be wasted as the vehicle is decelerating or braking. The system converts the kinetic energy to electrical energy to recharge an on board electrical energy supply source for use in assisting with the acceleration of the vehicle.

Abstract: A fluid drive system that can be used to drive a vehicle and has energy regeneration and storage capabilities. The fluid drive system includes an electrical energy supply source mounted on the vehicle, at least one electrical motor electrically connected to the electrical supply source, and a hydraulic pump driven that may be of the variable displacement type by the electrical motor. The fluid drive system may also include a low pressure hydraulic fluid supply tank supplying fluid to the hydraulic pump, at least one pneumatically charged accumulator tank for storing pressurized hydraulic fluid, a combination hydraulic motor and pump that may also be of the variable displacement type being alternately driven by the hydraulic pump and the pneumatically charged accumulator tank; and an electrical regeneration system for regenerating the electrical energy supply. The electrical regeneration system may be powered by hydraulic fluid from the combination electrical motor and pump.