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The disclosed embodiments relate to a method and system for regeneration of a catalyst. The system includes an engine that creates an exhaust stream and a fuel supply adapted to supply a fuel stream to the engine. A reactor includes a catalyst and is in fluid communication with the engine to receive

The disclosed embodiments relate to a method and system for regeneration of a catalyst. The system includes an engine that creates an exhaust stream and a fuel supply adapted to supply a fuel stream to the engine. A reactor includes a catalyst and is in fluid communication with the engine to receive the exhaust stream. A sensor senses a system parameter and produces a signal corresponding to the system parameter. A controller receives the signal and directs at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed by the sensor.

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The invention claimed is: 1. A system for regeneration of a catalyst, comprising: an engine that creates an exhaust stream, wherein the engine comprises a diesel engine; a fuel supply adapted to supply a fuel stream to the engine; a reactor that includes a catalyst and is in fluid communication wit

The invention claimed is: 1. A system for regeneration of a catalyst, comprising: an engine that creates an exhaust stream, wherein the engine comprises a diesel engine; a fuel supply adapted to supply a fuel stream to the engine; a reactor that includes a catalyst and is in fluid communication with the engine to receive the exhaust stream; a sensor that senses a system parameter and produces a signal corresponding to the system parameter; and a controller that receives the signal and directs at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed by the sensor. 2. A system for regeneration of a catalyst, comprising: an engine that creates an exhaust stream; a fuel supply adapted to supply a fuel stream to the engine; a reactor that includes a catalyst and is in fluid communication with the engine to receive the exhaust stream; a sensor that senses a system parameter and produces a signal corresponding to the system parameter; and a controller that receives the signal and directs at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed by the sensor, wherein the regeneration operation comprises at least one of: beginning a regeneration cycle, ending a regeneration cycle and controlling the temperature of a catalyst. 3. A system for regeneration of a catalyst, comprising: an engine that creates an exhaust stream; a fuel supply adapted to supply a fuel stream to the engine; a reactor that includes a catalyst and is in fluid communication with the engine to receive the exhaust stream; a sensor that senses a system parameter and produces a signal corresponding to the system parameter; a flow control apparatus configured to control an amount of the exhaust stream delivered to the catalyst; and a controller that receives the signal and directs at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed by the sensor. 4. The system according to claim 1 wherein the system parameter comprises a notch level of the engine. 5. The system according to claim 4 wherein the notch comprises notch two. 6. A system for regeneration of a catalyst, comprising: an engine that creates an exhaust stream; a fuel supply adapted to supply a fuel stream to the engine; a reactor that includes a catalyst and is in fluid communication with the engine to receive the exhaust stream; a sensor that senses a system parameter and produces a signal corresponding to the system parameter; and a controller that receives the signal and directs at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed by the sensor, wherein the system parameter comprises a temperature of the catalyst. 7. A system for regeneration of a catalyst, comprising: an engine that creates an exhaust stream; a fuel supply adapted to supply a fuel stream to the engine; a reactor that includes a catalyst and is in fluid communication with the engine to receive the exhaust stream; a sensor that senses a system parameter and produces a signal corresponding to the system parameter; and a controller that receives the signal and directs at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed by the sensor, wherein the system parameter comprises a temperature of the exhaust stream. 8. The system according to claim 6 further comprising an electric heater configured to boost the temperature of the catalyst. 9. A system for regeneration of a catalyst, comprising: an engine that creates an exhaust stream; a fuel supply adapted to supply a fuel stream to the engine; a reactor that includes a catalyst and is in fluid communication with the engine to receive the exhaust stream; a sensor that senses a system parameter and produces a signal corresponding to the system parameter; and a controller that receives the signal and directs at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed by the sensor, wherein the controller is further configured to control a fuel injection timing of the engine. 10. A system for regeneration of a catalyst, comprising: an engine that creates an exhaust stream; a fuel supply adapted to supply a fuel stream to the engine; a reactor that includes a catalyst and is in fluid communication with the engine to receive the exhaust stream; a sensor that senses a system parameter and produces a signal corresponding to the system parameter; and a controller that receives the signal and directs at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed by the sensor, wherein the catalyst comprises a fuel conversion catalyst, a hydrocarbon-based selective catalytic reduction catalyst, or a hybrid catalyst. 11. The system according to claim 1, wherein the reactor further comprises one first reactor comprising a fuel conversion catalyst and one second reactor comprising a hydrocarbon-based selective catalytic reduction catalyst such that the fuel conversion catalyst can be configured to boost the temperature of the hydrocarbon-based selective catalytic reduction catalyst. 12. The system according to claim 1, wherein the diesel engine is disposed in a locomotive. 13. The system according to claim 1, wherein the diesel engine is disposed in an exhaust gas recirculation application. 14. The system according to claim 1, wherein the diesel engine is disposed in at least one of: an off-road diesel engine, a stationary diesel engine and a marine engine. 15. The system according to claim 9, wherein the fuel comprises a lean-burn hydrocarbon fuel. 16. A railroad locomotive comprising: an engine that includes at least one cylinder that creates an exhaust stream; a fuel supply adapted to supply a fuel stream to the engine; a fuel injection system coupled to the engine and comprising at least one fuel injector, the fuel injection system configured to inject the fuel stream into the at least one cylinder; a reactor that includes a catalyst, is in fluid communication with the engine to receive the exhaust stream; a sensor that senses a system parameter and produces a signal corresponding to the system parameter; and a controller that receives the signal and directs at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed by the sensor. 17. The railroad locomotive according to claim 16 further comprising an electric heater configured to boost a temperature of the catalyst. 18. The railroad locomotive according to claim 16, wherein the controller is configured to control a fuel injection timing of the engine. 19. A method for regeneration of a catalyst, comprising: supplying a fuel stream to an engine, wherein the engine comprises a diesel engine; generating an exhaust stream from the engine, wherein the exhaust stream is generated by burning at least a portion of the fuel stream; passing the exhaust stream over a reactor that includes a catalyst and is in fluid communication with the engine; sensing a system parameter and producing a signal corresponding to the system parameter; and receiving the signal and directing at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed. 20. A method for regeneration of a catalyst, comprising: supplying a fuel stream to an engine; generating an exhaust stream from the engine, wherein the exhaust stream is generated by burning at least a portion of the fuel stream; passing the exhaust stream over a reactor that includes a catalyst and is in fluid communication with the engine; sensing a system parameter and producing a signal corresponding to the system parameter; and receiving the signal and directing at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed, wherein the regeneration operation comprises at least one of: beginning a regeneration cycle, ending a regeneration cycle and controlling the temperature of a catalyst. 21. A method for regeneration of a catalyst, comprising: supplying a fuel stream to an engine; generating an exhaust stream from the engine, wherein the exhaust stream is generated by burning at least a portion of the fuel stream; passing the exhaust stream over a reactor that includes a catalyst and is in fluid communication with the engine; sensing a system parameter and producing a signal corresponding to the system parameter; receiving the signal and directing at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed; and controlling a flow of the exhaust stream. 22. The method according to claim 19, wherein the system parameter comprises a notch level of the engine. 23. The method according to claim 19, wherein the notch comprises notch two. 24. A method for regeneration of a catalyst, comprising: supplying a fuel stream to an engine; generating an exhaust stream from the engine, wherein the exhaust stream is generated by burning at least a portion of the fuel stream; passing the exhaust stream over a reactor that includes a catalyst and is in fluid communication with the engine; sensing a system parameter and producing a signal corresponding to the system parameter; and receiving the signal and directing at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed, wherein the system parameter comprises a temperature of the catalyst. 25. A method for regeneration of a catalyst, comprising: supplying a fuel stream to an engine; generating an exhaust stream from the engine, wherein the exhaust stream is generated by burning at least a portion of the fuel stream; passing the exhaust stream over a reactor that includes a catalyst and is in fluid communication with the engine; sensing a system parameter and producing a signal corresponding to the system parameter; and receiving the signal and directing at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed, wherein the system parameter comprises a temperature of the exhaust stream. 26. The method according to claim 24 further comprising heating the reactor to boost the temperature of the catalyst. 27. A method for regeneration of a catalyst, comprising: supplying a fuel stream to an engine; generating an exhaust stream from the engine, wherein the exhaust stream is generated by burning at least a portion of the fuel stream; passing the exhaust stream over a reactor that includes a catalyst and is in fluid communication with the engine; sensing a system parameter and producing a signal corresponding to the system parameter; and receiving the signal and directing at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed, wherein the catalyst comprises a fuel conversion catalyst, a hydrocarbon-based selective catalytic reduction catalyst, or a hybrid catalyst. 28. The method according to claim 19, wherein the reactor comprises one first reactor comprising a fuel conversion catalyst and one second reactor comprising a hydrocarbon-based selective catalytic reduction catalyst such that the fuel conversion catalyst can be configured to boost the temperature of the hydrocarbon-based selective catalytic reduction catalyst. 29. The system according to claim 19, wherein the diesel engine is disposed in a locomotive. 30. The method according to claim 19, wherein the diesel engine is disposed in an exhaust gas recirculation application. 31. The system according to claim 19, wherein the diesel engine comprises at least one of: an off-road diesel engine, a stationary diesel engine and a marine engine. 32. A method for regeneration of a catalyst, comprising: supplying a fuel stream to an engine; generating an exhaust stream from the engine, wherein the exhaust stream is generated by burning at least a portion of the fuel stream; passing the exhaust stream over a reactor that includes a catalyst and is in fluid communication with the engine; sensing a system parameter and producing a signal corresponding to the system parameter; and receiving the signal and directing at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed, wherein the fuel comprises a lean-burn hydrocarbon fuel. 33. A method for regeneration of a catalyst, comprising: supplying a fuel stream to an engine; generating an exhaust stream from the engine, wherein the exhaust stream is generated by burning at least a portion of the fuel stream; passing the exhaust stream over a reactor that includes a catalyst and is in fluid communication with the engine; sensing a system parameter and producing a signal corresponding to the system parameter; receiving the signal and directing at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed; and injecting the fuel into the catalyst to raise the temperature of the catalyst to reach a light-off temperature of coke oxidation.