Fuel selection method and related system for a mobile asset

1. A method for operating a mobile asset, comprising:

supplying an engine with a fuel controller a first amount of a first fuel and a second amount of a second fuel; and

combusting the first fuel and the second fuel at a fuel combustion ratio in at least one cylinder of the engine, the fuel combustion ratio being selected based on route information for a route along which the mobile asset is operable to travel and a projected exhaustion of the first fuel that does not precede a projected exhaustion of the second fuel, wherein the mobile asset is unable to operate with the second fuel alone; and

wherein the fuel combustion ratio is further selected so that an actual emission level associated with usage of the first and second fuels is less than or equal to a determined emission level included in projected emission information associated with the route.

2. The method of claim 1 , wherein the first amount and the second amount are selected further based on a remaining quantity of the first fuel in a first fuel source and a remaining quantity of the second fuel in a second fuel source.

3. The method of claim 1 , wherein the first amount and the second amount are selected further based on fuel market information including, for at least one of the first fuel or the second fuel, one or more of availability information or price information, and wherein the fuel market information includes fuel market information for one or more fuel stations along the route.

4. The method of claim 1 , wherein the route information includes one or more of projected mobile asset location information, projected fuel usage information, projected engine speed information, projected engine load information, projected engine emission information, or fuel station location information for one or more fuel stations along the route, and wherein fuel combustion ratio is further selected based on mobile asset operation information including one or more of actual engine speed information, actual engine load information, actual engine emission information, or actual mobile asset location information.

5. The method of claim 1 , wherein the fuel combustion ratio is a ratio of the first fuel and the second fuel to be delivered to the at least one cylinder of the engine, and wherein the fuel combustion ratio is further selected based upon mobile asset operation information including one or more of a quantity of at least one of the first or second fuels present in respective mobile asset fuel sources or actual fuel usage information.

6. The method of claim 5 , wherein selecting the fuel combustion ratio further based upon the mobile asset operation information comprises determining a predicted first amount of the first fuel and a predicted second amount of the second fuel based at least in part on projected fuel usage information and adjusting the predicted first amount of the first fuel and the predicted second amount of the second fuel based on one or more of actual fuel usage information, actual engine speed information, actual engine load information, actual engine emission information, or actual mobile asset location information.

7. The method of claim 1 , further comprising supplying an engine exhaust with a third amount of the first fuel so that the actual emission level associated with usage of the first and second fuels is less than or equal to the determined emission level.

8. The method of claim 1 , further comprising selecting, from a plurality of fuel stations along the route, a particular fuel station for refueling the mobile asset with at least one of the first or second fuels based upon the route information so that the projected exhaustion of the first fuel does not precede the projected exhaustion of the second fuel.

9. The method of claim 1 , wherein the first amount and the second amount are further selected so that the projected exhaustion of a particular fuel selected from the first fuel and the second fuel does not precede projected arrival of the mobile asset at a location where the mobile asset may be resupplied with that particular fuel.