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A hybrid electric propulsion system for powering a vehicle using a natural fuel engine and an electric motor. The hybrid electric vehicle is comprised of a drive train; an electric motor for driving the drive train; an auxiliary power unit (APU); an electric energy storage system electrically couple

A hybrid electric propulsion system for powering a vehicle using a natural fuel engine and an electric motor. The hybrid electric vehicle is comprised of a drive train; an electric motor for driving the drive train; an auxiliary power unit (APU); an electric energy storage system electrically coupled to the electric motor; and wherein the auxiliary power unit and the electric energy storage system provide energy for powering the vehicle. An electric bus is directly connected to both the auxiliary power unit and the electric energy source and the voltage across the electric bus is substantially the same as the voltage across the electric energy source so that a change in voltage of the electric bus results in the same change to the voltage across the electric energy source. A power management controller is programmed to control output power of the power unit to maintain the energy storage system between a predetermined high voltage set-point and a predetermined low voltage set-point.

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1. A hybrid electric vehicle comprised of:a drive train; an electric motor for driving said drive train; a power unit electrically coupled to said electric motor, an electric energy storage system electrically coupled to said electric motor; and wherein said power unit and said electric energy stora

1. A hybrid electric vehicle comprised of:a drive train; an electric motor for driving said drive train; a power unit electrically coupled to said electric motor, an electric energy storage system electrically coupled to said electric motor; and wherein said power unit and said electric energy storage system provide electricity to said electric motor for powering said vehicle; a power management controller programmed to control output power of said power unit to maintain said energy storage system between a predetermined high voltage set-point and a predetermined low voltage set-point; wherein voltage levels of said energy storage system are maintained by an inversely proportional ratio of vehicle speed to storage voltage; and wherein power from said power unit is increased to maintain the desired ratio of vehicle speed, to storage voltage if said voltage level of said energy storage system drops at a fester rate than desired.