Hybrid electric vehicle
First Claim
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 comprising a bank of ultracapacitors 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; and
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 said vehicle has no device connected between said bank of ultracapacitors and said electric motor to convert variable voltage power to fixed voltage power; and
further comprising;
an electric bus connected to both the power unit and the electric energy source and where the voltage across the electric bus is substantially the same as the voltage across said 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.
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Accused Products
Abstract
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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Citations
21 Claims
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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 comprising a bank of ultracapacitors 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; and
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 said vehicle has no device connected between said bank of ultracapacitors and said electric motor to convert variable voltage power to fixed voltage power; and
further comprising;
an electric bus connected to both the power unit and the electric energy source and where the voltage across the electric bus is substantially the same as the voltage across said 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- a drive train;
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21. A hybrid electric vehicle comprised of:
- a drive train;
an electric motor for driving said drive train;
an engine for driving said drive train;
an electric energy storage system comprising a bank of ultracapacitors electrically coupled to said electric motor; and
wherein said engine and said electric energy storage system power said vehicle; and
a controller programmed to control said electric motor to vary output power of said motor to meet power requirement and to substantially maintain said energy storage system between a predetermined high voltage set-point and a predetermined low voltage set-point;
wherein said controller is programmed to allow the motor to recharge said electric energy storage system when engine power is below a predetermined level; and
wherein said controller is programmed to substantially maintain a predetermined ratio of vehicle speed to energy storage voltage.
- a drive train;
Specification