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A control system and methodology for a gas turbine having multiple fuel valves for multiple combustion chambers involves tuning the fuel valves to associated combustion chambers to optimize nitrous oxide emissions; dynamic pressure, and variation in fuel/air ratio. Further, fine tuning of the fuel v

A control system and methodology for a gas turbine having multiple fuel valves for multiple combustion chambers involves tuning the fuel valves to associated combustion chambers to optimize nitrous oxide emissions; dynamic pressure, and variation in fuel/air ratio. Further, fine tuning of the fuel valves is then used to maintain dynamic pressure oscillations, nitrous oxide emissions or variation in fuel/air ratio within predetermined limits.

대표청구항 ▼

A control system and methodology for a gas turbine having multiple fuel valves for multiple combustion chambers involves tuning the fuel valves to associated combustion chambers to optimize nitrous oxide emissions; dynamic pressure, and variation in fuel/air ratio. Further, fine tuning of the fuel v

A control system and methodology for a gas turbine having multiple fuel valves for multiple combustion chambers involves tuning the fuel valves to associated combustion chambers to optimize nitrous oxide emissions; dynamic pressure, and variation in fuel/air ratio. Further, fine tuning of the fuel valves is then used to maintain dynamic pressure oscillations, nitrous oxide emissions or variation in fuel/air ratio within predetermined limits. own power, operating the variable valve actuation mechanism to change the timing of operation of the intake valves so as to transition the fuel-air ratio of mixture that is being combusted in the cylinders from a relatively leaner mixture to a mixture that is sufficiently richer than stoichiometric to effectively regenerate the catalyst, wherein the variable valve actuation mechanism also varies the opening and closing times of exhaust valves that control flow from the cylinders into the exhaust system, and the method further includes the step of operating the variable valve actuation mechanism to change the timing of operation of the exhaust valves so as to provide some degree of internal exhaust gas recirculation within the cylinders as the catalyst is being regenerated.7. A method as set forth in claim 6 wherein the engine further includes a turbocharger operated by the exhaust for boosting pressure in the intake system, the method further includes the step of causing the turbocharger to assume an operating condition where pressure in the intake system is substantially equal to pressure in the exhaust system as the catalyst is being regenerated.8. A method as set forth in claim 7 including the steps of then increasing fueling so as to increase the carbon monoxide (CO) content of exhaust passing through the catalyst during regeneration and of controlling the increased fueling to limit temperature of the exhaust to a predefined limit.9. A method as set forth in claim 6 including the step of then increasing fueling so as to increase the carbon monoxide (CO) content of exhaust passing through the catalyst during regeneration.10. A method as set forth in claim 9 including the step of controlling the increased fueling to limit temperature of the exhaust to a predefined limit.11. A method as set forth in claim 9 including the steps of measuring the elapsed time of regeneration and of terminating regeneration when the measurement of the elapsed time exceeds a predefined time limit.12. A method as set forth in claim 11 including the steps of sensing NOx concentration in exhaust that has passed through the catalyst while the elapsed time of regeneration is being measured, and of terminating regeneration sooner than the predefined time limit if the sensed NOx concentration is below a predefined threshold.13. A method of regenerating a NOx adsorber catalyst that adsorbs NOx in exhaust passing through an exhaust system of an internal combustion engine that has a variable valve actuation mechanism for varying the opening and closing times of intake valves that control flow into cylinders of the engine from an intake system, the method comprising: with the engine running under its own power, operating the variable valve actuation mechanism to change the timing of operation of the intake valves so as to transition the fuel-air ratio of mixture that is being combusted in the cylinders from a relatively leaner mixture to a mixture that is sufficiently richer than stoichiometric to effectively regenerate the catalyst, including the steps of measuring the elapsed time of regeneration, of sensing NOx concentration in exhaust that has passed through the catalyst while the elapsed time of regeneration is being measured, and of terminating regeneration at the earlier occurrence of a) the elapsed time exceeding a predefined time limit, and b) the sensed NOx concentration being below a predefined threshold.14. A diesel engine comprising: multiple engine cylinders within which combustion occurs and a kinematic mechanism, including pistons that reciprocate within the cylinders, through which energy of combustion is converted to a torque output;an intake system, including a turbocharger, through which charge air is delivered to the cylinders;intake valves for controlling communication of the cylinders with the intake system;an exhaust system through which products