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A system and method for retrofitting a propulsion circuit of an existing Off Highway Vehicle to enable the propulsion circuit to operate as a hybrid energy Off Highway Vehicle propulsion circuit. The hybrid propulsion circuit includes a primary power source, and a traction motor for propelling an Of

A system and method for retrofitting a propulsion circuit of an existing Off Highway Vehicle to enable the propulsion circuit to operate as a hybrid energy Off Highway Vehicle propulsion circuit. The hybrid propulsion circuit includes a primary power source, and a traction motor for propelling an Off Highway Vehicle in response to the primary electric power. The traction motor has a motoring mode of operation and a power dissipation mode of operation. The traction motor generates dynamic braking electrical power in the power dissipation mode of operation. An electrical energy storage system includes a chopper circuit coupled to an energy storage device. The storage device is responsive to the chopper circuit to selectively store electrical energy generated in the power dissipation mode. The storage system selectively provides secondary electric power from the storage device to traction motor to assist in propelling the Off Highway Vehicle during the motoring mode.

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What is claimed is: 1. A retrofit system for a vehicle, said system comprising: an electrical energy storage system coupled to a traction bus portion of the vehicle, said traction bus carrying electric power to a traction motor, said traction motor having a motoring mode of operation and a power di

What is claimed is: 1. A retrofit system for a vehicle, said system comprising: an electrical energy storage system coupled to a traction bus portion of the vehicle, said traction bus carrying electric power to a traction motor, said traction motor having a motoring mode of operation and a power dissipation mode of operation, wherein the traction motor works to propel the vehicle in response to primary electric power received at the traction motor during the motoring mode, wherein the traction motor generates dynamic braking electrical power which is returned to the traction bus when the traction motor is operating in the power dissipation mode, and wherein the vehicle comprises an electrical resistance system having a plurality of strings of resistors for dissipating electric power generated in the traction motor during the power dissipation mode; wherein the energy storage system comprises an electrical power storage device for storing dynamic braking electrical power generated by the traction motor in the power dissipation mode as secondary electrical power, and for transmitting stored secondary electrical power from the storage device to the traction motor to augment the primary electric power to propel the vehicle in the motoring mode; and wherein the energy storage system replaces one or more of the plurality of strings of resistors of the electrical resistance system, such that generated electrical power that would have been dissipated in the replaced one or more strings of resistors is captured by the electrical energy storage system. 2. The retrofit system of claim 1 wherein the electrical energy storage system includes a first auxiliary switching device responsive to dynamic braking electric power generated in the traction motor during the power dissipation mode for regulating power dissipation and maintaining the direct current bus voltage at a desired voltage magnitude by storing excess dynamic braking electrical power in the electrical power storage device as secondary power. 3. The retrofit system of claim 2 wherein the electrical energy storage system further comprises: a second storage device coupled to the traction bus for storing electrical power; and a second auxiliary switching device responsive to the dynamic braking electrical electric power generated in the traction motor during the dissipation mode for selectively transferring a second portion of the generated electrical power to the second storage device as second secondary power. 4. The retrofit system of claim 3 wherein secondary power is selectively transmitted from the second storage device to the traction motor when the traction motor is operating in motoring mode to augment the primary electric power and assist in propelling the vehicle. 5. The retrofit system of claim 1 wherein the energy storage system comprises a battery system. 6. The retrofit system of claim 1 wherein the energy storage system comprises a flywheel system. 7. The retrofit system of claim 1 wherein the energy storage system comprises an ultra-capacitor. 8. A retrofit system for a vehicle, said system comprising: an energy storage system coupled to a traction bus portion of the vehicle, said traction bus carrying electric power to a traction motor, said traction motor having a motoring mode of operation and a power dissipation mode of operation, wherein the traction motor works to propel the vehicle in response to electric power received at the traction motor during the motoring mode, wherein the traction motor generates dynamic braking electrical power which is returned to the traction bus when the traction motor is operating in the power dissipation mode, and wherein the vehicle comprises an electrical resistance system having at least two resistor grid circuits, each resistor grid circuit comprising one or more strings of resistors for dissipating electric power generated in the traction motor during the power dissipation mode; wherein the energy storage system comprises an electrical power storage device for storing dynamic braking electrical power generated by the traction motor in the power dissipation mode, and for transmitting stored electrical power from the storage device to the traction motor to augment the electric power to propel the vehicle in the motoring mode; and wherein the energy storage system replaces at least one of the one or more strings of resistors of one of the at least two resistor grid circuits of the electrical resistance system, such that generated electrical power that would have been dissipated in the replaced at least one of the one or more strings of resistors is captured by the energy storage system. 9. A retrofit system for a vehicle, said system comprising: an energy storage system coupled to a traction system of the vehicle, the energy storage system comprising an electrical power storage device for storing dynamic braking electrical power generated by the traction system in a power dissipation mode, and for transmitting stored electrical power from the storage device to the traction system to help propel the vehicle in a motoring mode; wherein the traction system includes an electrical resistance system having a plurality of strings of resistors for dissipating electric power generated during the power dissipation mode; and wherein the energy storage system replaces one of the plurality of strings of resistors of the electrical resistance system, such that generated electrical power that would have been dissipated in the replaced one of the plurality of strings of resistors is captured by the energy storage system. 10. The retrofit system of claim 9 wherein: the electrical resistance system has at least two resistor grid circuits, each resistor grid circuit comprising one or more strings of resistors for dissipating electric power generated during the power dissipation mode; and wherein the energy storage system replaces at least one of the one or more strings of resistors of one of the at least two resistor grid circuits of the electrical resistance system, such that generated electrical power that would have been dissipated in the replaced at least one of the one or more strings of resistors is captured by the energy storage system.