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1. US20040074310 - Method and device for determining quantities of fluid

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[ EN ]

Claims

1. Method for determining the quantity of fluid discharged from a tank, in particular from a fuel tank, via a line system, wherein the difference between the quantity of fluid contained inside the tank ( 10; 40; 80) before fluid discharge and the quantity of fluid remaining inside the tank ( 10, 40, 80) after fluid discharge is calculated in order to determine the discharged quantity of fluid,
characterized in that
the quantity of fluid contained inside the line system ( 14; 44, 46, 48; 82) is detected and the quantity of fluid detected inside the line system ( 14; 44, 46, 48; 82) is taken into consideration when determining the discharged quantity of fluid.
2. Method according to claim 1,
characterized in that
the quantity of fluid contained inside the line system ( 14; 44, 46, 48; 82) is detected after the flow connection of the tank ( 10; 40; 80) to the line system ( 14; 44, 46, 48; 82) has been interrupted.
3. Method according to claim 1 or 2,
characterized in that
the difference between the quantity of fluid contained inside the line system ( 14; 44, 46, 48; 82) before fluid discharge and the quantity of fluid remaining inside the line system ( 14; 44, 46, 48; 82) after fluid discharge is calculated when determining the discharged quantity of fluid.
4. Method according to any one of claims 1 to 3,
characterized in that
fluid-free sections ( 102) of the line system ( 14; 44, 46, 48; 82) are detected before and after fluid discharge and are taken into consideration when determining the quantity of fluid discharged in total from the tank ( 10) and the line system ( 14; 44, 46, 48; 82).
5. Method according to any one of the preceding claims,
characterized in that
when determining the discharged quantity of fluid the quantity of fluid contained inside the line system ( 14; 44, 46, 48; 82) is only taken into consideration if the quantity of fluid contained inside the tank ( 10; 40, 80) is smaller than or equal to a predetermined threshold value.
6. Method according to any one of the preceding claims,
characterized in that
the quantity of fluid contained inside the line system ( 14; 44, 46, 48; 82) after completion of the fluid discharge is reconveyed into the tank ( 10; 40; 80).
7. Method according to any one of the preceding claims,
characterized in that
the inclination of the tank ( 10; 40; 80) and/or the inclination of the line system ( 14; 44, 46, 48; 82) is detected during the fluid discharge and when determining the quantity of fluid actually discharged the quantity of fluid that was determined theoretically beforehand is corrected according to the detected inclination.
8. Method according to any one of the preceding claims,
characterized in that
when the tank ( 10; 40; 80) is completely emptied via a discharge ( 74; 86) the discharge ( 74; 86) is connected with the line system ( 14; 44, 46, 48; 82) and the quantity of fluid contained inside the line system ( 14; 44, 46, 48; 82) is detected continuously in order to detect the complete emptying of the tank ( 10; 40; 80).
9. Method according to any one of the preceding claims,
characterized in that
the temperature of the fluid is detected and when determining the quantity of fluid actually discharged the quantity of fluid that was determined theoretically beforehand is corrected according to the temperature of the fluid.
10. Device for determining the quantity of fluid discharged from a tank, in particular from a fuel tank, via a line system, comprising an evaluation unit ( 130) which calculates the difference between the quantity of fluid contained inside the tank before fluid discharge and the quantity of fluid remaining inside the tank ( 10; 40; 80) after fluid discharge in order to determine the discharged quantity of fluid, in particular for performing the method according to any one of claims 1 to 9,
characterized in that
a measuring device ( 20; 54; 100) is provided in the line system ( 14; 44, 46, 48; 82) for detecting the quantity of fluid contained inside the line system ( 14; 44, 46, 48; 82), which is connected to the evaluation unit ( 130), and in that the evaluation unit ( 130) is designed to take into consideration the quantity of fluid detected inside the line system ( 14; 44, 46, 48; 82) when determining the discharged quantity of fluid.
11. Device according to claim 10,
characterized in that
a tank valve ( 12; 42; 84) is provided between the tank ( 10; 40; 80) and the line system ( 14; 44, 46, 48; 82) for blocking the line system ( 14; 44, 46, 48; 82) and, seen in the flow direction of the fluid to be discharged, the measuring device ( 20; 54; 100) is disposed after the tank valve ( 12; 42; 84) in the line system ( 14; 44, 46, 48; 82).
12. Device according to claim 10 or 11,
characterized in that
a pumping device ( 52; 94) is provided in the line system ( 44, 46, 48; 82) and, seen in the flow direction of the fluid to be discharged, the measuring device ( 54; 100) is arranged preferably after or optionally before the pumping device ( 52, 94) in the line system ( 44, 46, 48; 82).
13. Device according to claim 10, 11 or 12,
characterized in that
the line system ( 82) is divided by a valve, preferably by a check valve ( 104), into a first and a subsequent second section ( 102, 106), the second section ( 106) having a connection for full pipes ( 114, 116), and
in that the measuring device ( 100) is arranged in the first section ( 102).
14. Device according to claim 13,
characterized in that
the first section ( 102) has a connection ( 110) for empty pipes.
15. Device according to claim 13 or 14,
characterized in that
a stop valve ( 108, 112) is each provided in the line system ( 82) near the pipe connection ( 110) for empty pipes and respectively near the pipe connections for full pipes.
16. Device according to any one of claims 10 to 15,
characterized in that
the measuring device ( 20; 54; 100) has a measuring tube ( 22; 56; 98) which is in flow connection with the line system ( 14; 48; 82).
17. Device according to claim 16,
characterized in that
when the tank ( 19; 40; 80) is in the zero-degree position the measuring tube ( 22; 56; 98) extends at least approximately vertically.
18. Device according to claim 16 or 17,
characterized in that
the measuring tube ( 22; 56; 98) is dimensioned in its length such that, seen with respect to the bottom of the tank ( 10; 40; 80), it projects in the vertical direction from the bottom of the tank ( 10; 40; 80) and forms an overlapping measuring portion ( 34; 138) for the tank ( 10; 40; 80) and the measuring tube ( 22; 56; 98).
19. Device according to claim 16, 17 or 18,
characterized in that
the measuring tube is designed as a gauge tube ( 22; 56; 98) of a gauging device ( 20; 54; 100) which has a gauge stick ( 24; 58; 126) accommodated in the gauge tube ( 22; 56, 98) for measuring the fluid level.
20. Device according to any one of claims 10 to 19,
characterized in that
a further measuring device, preferably a gauging device ( 28; 68; 132), is provided by means of which the fluid level in the tank ( 10; 40; 80) can be detected and which is connected to the evaluation unit ( 130).
21. Device according to any one of claims 10 to 20,
characterized in that
the line system ( 82) is connected to the tank ( 80) by means of a discharge connection ( 86),
the discharge connection ( 86) is connected to the tank ( 80) by means of the tank valve ( 84) and
the discharge connection ( 86) can be blocked to the outside by means of a discharge valve ( 88).
22. Device according to claim 21,
characterized in that
a stop valve ( 90) is provided between the discharge connection ( 86) and the line system ( 82) for blocking the line system ( 82).
23. Tanker vehicle, in particular fuel tanker vehicle comprising a device according to any one of the preceding claims 10 to 22.