EP 4162141 A1 20230412 - METHOD AND SYSTEM FOR DIAGNOSING AN ACCUMULATOR IN A HYDRAULIC CIRCUIT
Title (en)
METHOD AND SYSTEM FOR DIAGNOSING AN ACCUMULATOR IN A HYDRAULIC CIRCUIT
Title (de)
VERFAHREN UND SYSTEM ZUR DIAGNOSE EINES AKKUMULATORS IN EINEM HYDRAULIKKREIS
Title (fr)
PROCÉDÉ ET SYSTÈME DE DIAGNOSTIC D'UN ACCUMULATEUR DANS UN CIRCUIT HYDRAULIQUE
Publication
Application
Priority
- SE 2050667 A 20200608
- SE 2021050455 W 20210512
Abstract (en)
[origin: WO2021251862A1] The present disclosure relates to a computer-implemented method and system for diagnosing the function of at least one accumulator in a hydraulic circuit in percussive rock drilling. The hydraulic circuit provides pressurised hydraulic fluid to power a percussion device (105) comprising a reciprocating percussion piston (115) for generating stress waves in a drill tool (106). The reciprocating motion of the percussion piston (115) and/or a damping piston (220) gives rise to pressure and flow variations in the hydraulic circuit, and the at least one accumulator is configured to reduce pressure and/or flow variations in the hydraulic circuit. The method comprises, during drilling, obtaining a plurality of pressure measurements over one or more tie periods, wherein the plurality of pressure measurements are obtained at a frequency being at least twice a frequency of the reciprocation motion of the percussion piston (115) and/or the damping piston (220). The method further comprises determining a representation of pressure and/or flow variations in the hydraulic circuit caused by the reciprocating motion of the percussion piston (115) and/or damping piston (220) over the one or more time periods and diagnosing the function of the at least one accumulator based on the determined representation of the pressure and/or flow variations in the hydraulic circuit and a reference representation of pressure and/or flow variations in the hydraulic circuit.
IPC 8 full level
E21B 1/00 (2006.01); E21B 44/06 (2006.01)
CPC (source: EP KR SE)
E21B 1/00 (2013.01 - EP); E21B 1/26 (2020.05 - KR); E21B 7/022 (2013.01 - KR SE); E21B 44/00 (2013.01 - SE); E21B 44/06 (2013.01 - EP KR); F15B 1/021 (2013.01 - SE); F15B 19/005 (2013.01 - SE); F15B 20/005 (2013.01 - SE)
Citation (search report)
See references of WO 2021251862A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
WO 2021251862 A1 20211216; AU 2021289190 A1 20221013; CA 3180154 A1 20211216; CN 115698458 A 20230203; EP 4162141 A1 20230412; JP 2023529438 A 20230710; KR 20230020390 A 20230210; SE 2050667 A1 20211209
DOCDB simple family (application)
SE 2021050455 W 20210512; AU 2021289190 A 20210512; CA 3180154 A 20210512; CN 202180039304 A 20210512; EP 21727619 A 20210512; JP 2022575488 A 20210512; KR 20227038370 A 20210512; SE 2050667 A 20200608