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A method of operating a drive system for a load is disclosed. The drive system may have an electric motor/generator and a gas turbine engine. The engine may have a combustor, and main and pilot flow paths via which fuel is supplied to the combustor. The engine may be operable in low and standard emi

A method of operating a drive system for a load is disclosed. The drive system may have an electric motor/generator and a gas turbine engine. The engine may have a combustor, and main and pilot flow paths via which fuel is supplied to the combustor. The engine may be operable in low and standard emissions modes. A proportion of the fuel that is supplied to the combustor via the pilot flow path may be greater in the standard emissions mode than in the low emissions mode. The method may include determining an engine power requirement of the load, and whether the engine power requirement of the load is sufficiently large to operate the engine in the low emissions mode. Additionally, the method may include operating the electric motor/generator if the engine power requirement of the load is not sufficiently large to operate the engine in the low emissions mode.

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1. A method of operating a drive system for a load, the drive system including an electric motor/generator and a gas turbine engine, the engine including a combustor, and main and pilot flow paths via which fuel is supplied to the combustor, the engine being operable in a low emissions mode and a st

1. A method of operating a drive system for a load, the drive system including an electric motor/generator and a gas turbine engine, the engine including a combustor, and main and pilot flow paths via which fuel is supplied to the combustor, the engine being operable in a low emissions mode and a standard emissions mode, a proportion of the fuel that is supplied to the combustor via the pilot flow path being greater in the standard emissions mode than in the low emissions mode, the method comprising: determining whether an environmental condition exceeds a threshold to operate the engine in the low emissions mode, wherein the environmental condition comprises at least one of inlet air temperature, humidity, air density, and fuel type; andoperating the electric motor/generator as a motor if the environmental condition fails to exceed the threshold to operate the engine in the low emissions mode. 2. The method of claim 1, wherein determining whether the environmental condition exceeds a threshold to operate the engine in the low emissions mode includes: determining an inlet air temperature of the engine;determining whether the inlet air temperature exceeds a threshold to operate the engine in the low emissions mode;determining that the environmental condition exceeds the threshold to operate the engine in the low emissions mode if the inlet air temperature exceeds the threshold to operate the engine in the low emissions mode; anddetermining that the environmental condition fails to exceed the threshold to operate the engine in the low emissions mode if the inlet air temperature fails to exceed a threshold to operate the engine in the low emissions mode. 3. The method of claim 1, further including: determining a minimum modified engine power requirement of the load when the electric motor/generator is operated as a motor; anddetermining whether the minimum modified engine power requirement exceeds a threshold to enable engine shut down, wherein the electric motor/generator is only operated as a motor if the minimum modified engine power requirement exceeds the threshold to enable engine shut down. 4. The method of claim 1, further including: determining an engine power requirement of the load;determining whether the engine power requirement of the load exceeds a threshold percentage of rated power to operate the engine in the low emissions mode; andoperating the electric motor/generator if: the environmental condition exceeds the threshold to operate the engine in the low emissions mode; andthe engine power requirement of the load fails to exceed the threshold percentage of rated power to operate the engine in the low emissions mode. 5. The method of claim 4, further including: determining a maximum modified engine power requirement of the load when the electric motor/generator is operated as a generator; anddetermining whether the maximum modified engine power requirement exceeds a threshold percentage of rated power to operate the engine in the low emissions mode, wherein the electric motor/generator is operated as a generator if the maximum modified engine power requirement exceeds the threshold percentage of rated power to operate the engine in the low emissions mode. 6. The method of claim 4, further including: determining a minimum modified engine power requirement of the load when the electric motor/generator is operated as a motor; anddetermining whether the minimum modified engine power requirement exceeds a threshold to enable engine shut down, wherein the electric motor/generator is operated as a motor if the minimum modified engine power requirement exceeds the threshold to enable engine shut down. 7. The method of claim 1, further including: determining an engine power requirement of the load;determining whether a rated power of the engine exceeds the engine power requirement of the load; andoperating the electric motor/generator as a motor if the rated power of the engine fails to exceed the engine power requirement of the load. 8. The method of claim 7, further including: determining a minimum modified engine power requirement of the load when the electric motor/generator is operated as a motor;determining whether the rated power of the engine exceeds the minimum modified engine power requirement; andnotifying an offboard system if the rated power of the engine fails to exceed the minimum modified engine power requirement. 9. A method of operating a drive system for a load, the drive system including an electric motor/generator and a gas turbine engine, the engine including a combustor, and main and pilot flow paths via which fuel is supplied to the combustor, the engine being operable in a low emissions mode and a standard emissions mode, a proportion of the fuel that is supplied to the combustor via the pilot flow path being greater in the standard emissions mode than in the low emissions mode, the method comprising: determining an engine power requirement of the load;determining whether the engine power requirement of the load exceeds a threshold percentage of rated power to operate the engine in the low emissions mode; andoperating the electric motor/generator if the engine power requirement of the load fails to exceed the threshold percentage of rated power to operate the engine in the low emissions mode. 10. The method of claim 9, further including: determining a maximum modified engine power requirement of the load when the electric motor/generator is operated as a generator; anddetermining whether the maximum modified engine power requirement exceeds a threshold percentage of rated power to operate the engine in the low emissions mode, wherein the electric motor/generator is operated as a generator if the maximum modified engine power requirement exceeds the threshold percentage of rated power to operate the engine in the low emissions mode. 11. The method of claim 9, further including: determining a minimum modified engine power requirement of the load when the electric motor/generator is operated as a motor; anddetermining whether the minimum modified engine power requirement exceeds a threshold to enable engine shut down, wherein the electric motor/generator is operated as a motor if the minimum modified engine power requirement exceeds the threshold to enable engine shut down. 12. The method of claim 9, further including: determining whether a rated power of the engine exceeds the engine power requirement of the load; andoperating the electric motor/generator as a motor if the rated power of the engine fails to exceed the engine power requirement of the load. 13. The method of claim 12, further including: determining a minimum modified engine power requirement of the load when the electric motor/generator is operated as a motor;determining whether the rated power of the engine exceeds the minimum modified engine power requirement; andnotifying an offboard system if the rated power of the engine fails to exceed the minimum modified engine power requirement. 14. The method of claim 9, further including determining whether an environmental condition exceeds a threshold to operate the engine in the low emissions mode, wherein: the environmental condition comprises at least one of inlet air temperature, humidity, air density, and fuel type; andthe electric motor/generator is operated as a motor if the environmental condition fails to exceed the threshold to operate the engine in the low emissions mode. 15. The method of claim 14, wherein determining whether the environmental condition exceeds a threshold to operate the engine in the low emissions mode includes: determining an inlet air temperature of the engine;determining whether the inlet air temperature exceeds a threshold to operate the engine in the low emissions mode;determining that the environmental condition exceeds the threshold to operate the engine in the low emissions mode if the inlet air temperature exceeds the threshold to operate the engine in the low emissions mode; anddetermining that the environmental condition fails to exceed the threshold to operate the engine in the low emissions mode if the inlet air temperature fails to exceed the threshold to operate the engine in the low emissions mode. 16. The method of claim 14, further including: determining a minimum modified engine power requirement of the load when the electric motor/generator is operated as a motor; anddetermining whether the minimum modified engine power requirement exceeds a threshold to enable engine shut down, wherein the electric motor/generator is only operated if the minimum modified engine power requirement exceeds the threshold to enable engine shut down.