Method and device for filling a hydraulic system with a hydraulic fluid
AssigneeDaimler Truck AG
InventorJochen Gerhard Mast
Life of this patent
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Abstract
A method for filling a hydraulic system with a hydraulic fluid includes sealing the hydraulic system in a pressure-tight manner and recording a pressure in the sealed hydraulic system, filling or removing a predefined volume of the hydraulic fluid from the sealed hydraulic system, recording a pressure in the sealed hydraulic system after the filling or removing, calculating a volume of a total residual air in the hydraulic system depending on the pressures before and after the filling or removal of the predefined volume, calculating a final correction volume depending on the volume and a design-specified air feed of the hydraulic system, and refilling or removing the calculated final correction volume to achieve a final correct filling quantity for the hydraulic system.
Claims11
A method for filling a hydraulic system (SYS) with a hydraulic fluid (40), comprising the steps of:
- sealing the hydraulic system (SYS) in a pressure-tight manner and recording a pressure (p2, abs) in the sealed hydraulic system (SYS);
- filling or removing a predefined second volume (ΔVKM, Mess) of the hydraulic fluid (40) from the sealed hydraulic system (SYS);
- recording a pressure (p3, abs) in the sealed hydraulic system (SYS) after the filling or removing of the predefined the second volume (ΔVKM, Mess);
- calculating a volume (V3) of a total residual air in the hydraulic system (SYS) depending on the pressures (p2, abs, p3, abs) before and after the filling or removal of the predefined second volume (ΔVKM, Mess) and calculating a final correction volume (VKM, korr) depending on the volume (V3) and a design-specified air feed (VL, AGB) of the hydraulic system (SYS);
- and
- refilling or removing the calculated final correction volume (VKM, Korr) to achieve a final correct filling quantity for the hydraulic system (SYS);
- wherein the final correction volume (VKM, Korr) is calculated such that a level of the hydraulic fluid (40) after filling the hydraulic system (SYS) with the final correction volume (VKM, Korr) is above a highest level (FHKM, max AGB) permanently permissible during operation;
- wherein after filling the hydraulic system (SYS) with the final correction volume (VKM, Korr), a volume (V5) of the hydraulic fluid (40) in a compensating reservoir (AGB) corresponding to a residual air volume (V4) is produced above the highest level (FHKM, max AGB) permanently permissible during operation.
A method for filling a hydraulic system (SYS) with a hydraulic fluid (40), comprising the steps of:
- sealing the hydraulic system (SYS) in a pressure-tight manner and recording a pressure (p2, abs) in the sealed hydraulic system (SYS);
- filling or removing the hydraulic fluid (40) from the sealed hydraulic system (SYS) until a predefined pressure (p3, abs) is reached in the sealed hydraulic system (SYS) and recording a volume (ΔVKM, Mess) of the hydraulic fluid (40) filled in during the filling or removing;
- calculating a volume (V3) of a total residual air in the hydraulic system (SYS) depending on the pressures (p2, abs, p3, abs) before and after filling or removing of a second volume (ΔVKM, Mess) and calculating a final correction volume (VKM, korr) depending on the volume (V3) and a design-specified air feed (VL, AGB) of the hydraulic system (SYS);
- and
- refilling or removing the calculated final correction volume (VKM, Korr) to achieve a final correct filling quantity for the hydraulic system (SYS);
- wherein the final correction volume (VKM, Korr) is calculated such that a level of the hydraulic fluid (40) after filling the hydraulic system (SYS) with the final correction volume (VKM, Korr) is above a highest level (FHKM, max AGB) permanently permissible during operation;
- wherein after filling the hydraulic system (SYS) with the final correction volume (VKM, Korr), a volume (V5) of the hydraulic fluid (40) in a compensating reservoir (AGB) corresponding to a residual air volume (V4) is produced above the highest level (FHKM, max AGB) permanently permissible during operation.
Dependencies are inferred from the claim text.