A method includes i) identifying a period of operation corresponding to a fuel supply requirement; ii) determining at least one ambient air condition in which the machine will operate during the period; iii) determining a duration of time in which, whilst in the ambient air condition, it is required
A method includes i) identifying a period of operation corresponding to a fuel supply requirement; ii) determining at least one ambient air condition in which the machine will operate during the period; iii) determining a duration of time in which, whilst in the ambient air condition, it is required to achieve a predetermined vapor trail characteristic; iv) determining a resultant fuel composition for use by the machine in the ambient air condition to achieve the characteristic, where the resultant fuel composition includes at least one of the first and second fuel compositions; v) determining the ratio of at least the first and second fuel compositions required for sufficient resultant fuel composition for the duration of time determined in step iii); and vi) producing a first signal indicative of the ratio of at least the first and second fuel compositions required for the duration of time determined in step iii).
대표청구항▼
1. A method of supplying at least one of a first fuel composition and second fuel composition for use in a machine to achieve a fuel supply requirement, where the first fuel composition is different to the second fuel composition, the method comprising the steps of: i) identifying a period of operat
1. A method of supplying at least one of a first fuel composition and second fuel composition for use in a machine to achieve a fuel supply requirement, where the first fuel composition is different to the second fuel composition, the method comprising the steps of: i) identifying a period of operation corresponding to the fuel supply requirement;ii) determining at least one ambient air condition in which the machine will operate during the period of operation;iii) determining a duration of time in which, whilst in the ambient air condition, it is required to achieve a predetermined vapour trail characteristic, where the said duration may be equal to or less than the period of operation;iv) determining a resultant fuel composition for use by the machine in the ambient air condition to achieve the predetermined vapour trail characteristic, where the resultant fuel composition comprises at least one of the first fuel composition and the second fuel composition;v) determining the ratio of at least the first fuel composition and second fuel composition required for sufficient resultant fuel composition for the duration of time determined in step iii); andvi) producing a first signal indicative of the ratio of at least the first and second fuel compositions required for the duration of time determined in step iii). 2. A method as claimed in claim 1 wherein the ambient air condition is identified with reference to the relative positioning of the machine and the ambient air conditions to which the machine is likely to be exposed during the period of operation. 3. A method as claimed in claim 1 wherein the ambient air condition is determined in dependence upon forecast meteorological data including temperature, humidity and/or pressure. 4. A method as claimed in claim 1 wherein the predetermined vapour trail characteristic is obtained from an algorithm, look up table and/or database comprising detail of vapour trail persistence and its dependency upon ambient conditions. 5. A method as claimed in claim 1 wherein steps iii) to vi) of claim 1 are repeated for at least one further ambient air condition. 6. A method as claimed in claim 1 wherein the resultant fuel composition is determined in dependence upon the ambient air condition and the machine's scheduled operating point in the ambient air condition. 7. A method as claimed in claim 1 wherein the resultant fuel composition is calculated as a function of desired soot emission index determined by a soot requirement generator, and where optionally the desired soot emission index is determined as a function of one or more measured, forecast and/or inferred values of the ambient air condition including one or more of ambient temperature, ambient pressure and/or ambient humidity. 8. A method as claimed in claim 1 wherein the ratio of at least the first fuel composition and second fuel composition is derived from a look up table or database in dependence upon at least one of the first and second fuel composition, combustion characteristics of the engine, and engine operating point at the ambient air condition. 9. A method as claimed in claim 1 further comprising the step of determining the likelihood of vapour trail formation and/or vapour trail persistence in dependence upon the ambient air condition and the expected engine operating point at said ambient air condition. 10. A method as claimed in claim 1 wherein the total ratio of first fuel composition and second fuel composition required for the period of operation of the machine is calculated in dependence upon the ratio of first fuel composition and second fuel composition determined for each ambient air condition. 11. A method as claimed in claim 10 wherein a second signal is produced indicative of the total ratio of first fuel composition and second fuel composition required. 12. A method as claimed in claim 11 wherein, in response to the second signal, the total ratio of first fuel composition to second fuel composition is delivered to a first fuel storage tank and a second fuel storage tank for the machine respectively, the first tank and second tank being fluidly isolated from one another. 13. A method as claimed in claim 12 wherein the first fuel composition and second fuel composition are delivered prior to the period of operation. 14. A method as claimed in claim 13 wherein the machine is a vehicle, and the first fuel composition and second fuel composition are delivered prior to the vehicle commencing a journey. 15. A method as claimed in claim 14 wherein the vehicle is an aircraft, and the first fuel composition and second fuel composition are delivered to the aircraft. 16. A fuel delivery system for supplying at least one of a first fuel composition and second fuel composition to a machine to achieve a fuel supply requirement, where the first fuel composition is different to the second fuel composition, the fuel delivery system comprising: a calculator configured to:a) receive and/or determine data values which are indicative of a period of operation corresponding to the fuel supply requirement;b) receive and/or determine data values which are indicative of at least one ambient air condition in which the machine will operate during the period of operation; andc) determine a duration of time in which, whilst in the ambient air condition, it is required to achieve a predetermined vapour trail characteristic, where the said duration may be equal to or less than the period of operation;d) determine a resultant fuel composition for use by the machine in the ambient air condition to achieve the predetermined vapour trail characteristic, where the resultant fuel composition comprises at least one of the first fuel composition and the second fuel composition;e) determine the ratio of at least the first fuel composition and second fuel composition required to produce sufficient resultant fuel composition for the duration of time determined in step c); andf) produce a first signal indicative of the ratio of at least the first and second fuel compositions required for the time period determined in step c). 17. An engine comprising a fuel delivery system as claimed in claim 16 configured to operate the method of supplying at least one of a first fuel composition and second fuel composition for use in a machine to achieve a fuel supply requirement. where the first fuel composition is different to the second fuel composition, the method comprising the steps of: i) identifying a period of operation corresponding to the fuel supply Requirement;ii) determining at least one ambient air condition in which the machine will operate during the period of operation;iii) determining a duration of time in which, whilst in the ambient air condition, it is required to achieve a predetermined vapour trail characteristic, where the said duration may be equal to or less than the period of operation;iv) determining a resultant fuel composition for use by the machine in the ambient air condition to achieve the predetermined vapour trail characteristic, where the resultant fuel composition comprises at least one of the first fuel composition and the second fuel composition;v) determining the ratio of at least the first fuel composition and second fuel composition required for sufficient resultant fuel composition for the duration of time determined in step in); andvi) producing a first signal indicative of the ratio of at least the first and second fuel compositions required for the duration of time determined in step iii). 18. A vehicle comprising a fuel delivery system as claimed in claim 16 configured to operate the method of supplying at least one of a first fuel composition and second fuel composition for use in a machine to achieve a fuel supply requirement, where the first fuel composition is different to the second composition, the method comprising the steps of: i) identifying a period of operation corresponding to the fuel supply requirement;ii) determining at least one ambient air condition in which he machine will operate during the period of operation;iii) determining a duration of time in which, whilst in the ambient air condition, it is required to achieve a predetermined vapour trail characteristic, where the said duration may be equal to or less than the period of operation;iv) determining a resultant fuel composition for use by the machine in the ambient air condition to achieve the predetermined vapour characteristic, where the resultant fuel composition comprises at least one of the first fuel composition and the second fuel composition;v) determining the ratio of at least the first fuel composition and second fuel composition required for sufficient resultant fuel composition for the duration of time determined in step iii); andvi) producing a first signal indicative of the ratio of at least the first and second fuel compositions required for the duration of time determined in step iii). 19. An aircraft comprising a fuel delivery system as claimed in claim 16 configured to operate the method of supplying at least one of a first fuel composition and second fuel composition for use in a machine to achieve a fuel supply requirement, where the first fuel composition is different to the second fuel composition, the method comprising the steps: i) identifying a period of operation corresponding to the fuel supply Requirement;ii) determining at least one ambient air condition in which the machine will operate during the period of operation;iii) determining a duration of time in which, whilst in the ambient air condition, it is required to achieve a predetermined vapour trail characteristic, where the said duration may be equal to or less than the period of operation;iv) determining resultant fuel composition for use by the machine in the ambient air condition to achieve the predetermined vapour trail characteristic, where the resultant fuel composition comprises at least one of the first fuel composition and the second fuel composition;v) determining the ratio of at least the first fuel composition and second fuel composition required for sufficient resultant fuel composition for the duration of time determined in step iii); andvi) producing a first signal indicative of the ratio of at least the first and second fuel compositions required for the duration of time determined in step iii). 20. A static ground based facility comprising a fuel delivery system as claimed in claim 16 configured to operate the method of supplying at least one of a first fuel composition and second fuel composition for use in a machine to achieve a fuel supply requirement, where the first fuel composition is different to the second fuel composition, the method comprising the steps of: i) identifying a period of operation corresponding to the fuel supply requirement;ii) determining at least one ambient air condition in which the machine will operate during the period of operation;iii) determining a duration of time in which, whilst in the ambient air condition, it is required to achieve a predetermined vapour trail characteristic, where said duration ma be equal to or less than the period of operation;iv) determining a resultant fuel composition for use by the machine in the ambient air condition to achieve the predetermined vapour trail characteristic, where the resultant fuel composition comprises at least one of the first fuel composition and the second fuel composition;v) determining the ratio of at least the first fuel composition and second fuel composition required for sufficient resultant fuel composition for the duration of time determined in step iii); andvi) producing a first signal indicative of he ratio of at least the first and second fuel compositions required for the duration of time determined in step iii).
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이 특허에 인용된 특허 (8)
Gonzalez Cesar (Wichita KS), Fuel blending system method and apparatus.
Fegley Ronald W. (Whittier CA) Terry Darrell A. (Huntington Beach CA), Lidar droplet size monitor for in-flight measurement of aircraft engine exhaust contrails, droplets and aerosols.
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