Vehicle fuel tank arrangement and method for managing the supply of fuel to a vehicle

1. A vehicle fuel tank arrangement for a fuel comprising at least a first fluid and a second fluid, the tank arrangement comprising:

a tank; and

a partition wall arranged inside the tank in order to create at least a first compartment t for storing the first fluid and a second compartment for storing the second fluid;

wherein the position of the partition wall inside the tank can be changed to set the volume of the first compartment, respectively the second compartment, to a predetermined value;

wherein the vehicle fuel tank arrangement comprises an actuator which is coupled to the partition wall and which is arranged to change a position of the partition wall inside the tank to set a volume of the first compartment and a volume of the second compartment to predetermined values that are predetermined according to predicted consumptions of the first and second fluids.

2. The vehicle fuel tank arrangement according to claim 1 , wherein the actuator comprises a moving member fastened to a portion of the partition wall and driving means capable of moving the moving member in order to change the position of the partition wall inside the tank.

3. The vehicle fuel tank arrangement according to claim 1 , wherein the partition wall is substantially rigid and can be moved inside the tank.

4. The vehicle fuel tank arrangement according to claim 1 , wherein the partition wall has a resistance to deformation which is sufficiently low to make it possible for the actuator to deform the partition wall, and sufficiently high to prevent the partition wall from being substantially deformed by either fluid introduced or contained in a compartment of the tank.

5. The vehicle fuel tank arrangement according to claim 1 , wherein the respective consumptions of the first and second fluids are predicted according to at least one vehicle operational parameter.

6. The vehicle fuel tank arrangement according to claim 5 , wherein the at least one vehicle operational parameter is chosen among:

a type of route on which the vehicle is expected to travel;

a type of activity connected to the particular trip;

specific regulations applicable during the trip

a vehicle load

a desired comprise between vehicle performance, fuel consumption and toxic emissions the traffic;

weather conditions;

respective costs of the fluids contained in the fuel in a certain geographical zone;

availability of the fluids contained in the fuel, in a certain geographical zone.

7. The vehicle fuel tank arrangement according to claim 5 , comprising an electronic device capable of receiving, calculating or predicting said at least one operational parameter.

8. The system according to claim 7 , wherein the electronic device comprises a GPS (global positioning system).

9. The vehicle fuel tank arrangement according to claim 1 , wherein the first fluid comprises a first fuel and the second fluid comprises a second fuel and/or an additive and/or a depolluting agent.

10. The vehicle fuel tank arrangement according to claim 1 , wherein the first fluid comprises gasoline, ethanol, or a mixture thereof.

11. The vehicle fuel tank arrangement according to claim 1 , wherein the second fluid comprises diesel.

12. The vehicle fuel tank arrangement according to claim 1 , wherein the volume of the first compartment ranges from 40% to 80% of the volume of the tank, depending on the position of the partition wall.

13. The vehicle fuel tank arrangement according to claim 1 , wherein the fuel tank arrangement further comprises a flexible bag located inside at least one of the compartments and designed to contain the corresponding fluid.

14. A method for managing the supply of fuel to a vehicle engine, the method comprising:

providing a vehicle fuel tank arrangement for a fuel comprising at least a first fluid and a second fluid, the tank arrangement comprising;

a tank: and

a partition wall arranged inside the tank in order to create at least a first compartment for storing the first fluid and a second compartment for storing the second fluid;

wherein the position of the partition wall inside the tank can be change to set the volume of the first compartment, respectively the second compartment, to a predetermined value;

wherein the vehicle fuel tank arrangement comprises an actuator which is coupled to the partition wall and which is arranged to chance a position of the partition wall inside the tank to set a volume of the first compartment and a volume of the second compartment to predetermined values that are predetermined according to predicted consumptions of the first and second fluids,

predicting respective consumptions of the fluids contained in the fuel tank, based on at least one operational parameter, and

before the compartments are refilled, changing the position of the partition wall according to the prediction.

15. Method according to claim 14 , wherein the position of the partition wall is set so that volumes of fluids in first and second compartments fall below a minimum threshold substantially at the same time.

16. The method according to claims 14 , further comprising

monitoring a remaining volume of fluid in each compartment; and

altering a ratio of fluids in the fuel supplied to the vehicle engine when one fluid volume falls below a predetermined threshold.