US 12,286,985 B2
Method and system for monitoring hydraulic accumulator pressure
Morgan Michael Plamondon, Mukilteo, WA (US); Bradley M. Gilmer, Seattle, WA (US); John Watson, Lynnwood, WA (US); and Charles Filipiak, Lynnwood, WA (US)
Assigned to The Boeing Company, Chicago, IL (US)
Filed by The Boeing Company, Chicago, IL (US)
Filed on Dec. 15, 2021, as Appl. No. 17/551,726.
Claims priority of provisional application 63/134,163, filed on Jan. 5, 2021.
Prior Publication US 2022/0213907 A1, Jul. 7, 2022
Int. Cl. F15B 19/00 (2006.01); F15B 1/04 (2006.01); G01B 3/04 (2006.01); G01B 11/06 (2006.01); G01B 11/22 (2006.01); G01W 1/14 (2006.01)
CPC F15B 19/005 (2013.01) [F15B 1/04 (2013.01); G01W 1/14 (2013.01); F15B 2201/51 (2013.01); G01B 3/04 (2013.01); G01B 11/0608 (2013.01); G01B 11/0691 (2013.01); G01B 11/22 (2013.01); Y02A 90/10 (2018.01)] 20 Claims
OG exemplary drawing
 
1. A method for determining a gas charge pressure PcalcGC of a hydraulic accumulator within a hydraulic fluid system, the method comprising:
receiving pressure decay data representing the pressure decay within a hydraulic reservoir of the hydraulic fluid system as the hydraulic reservoir depressurizes from an operating pressure of the hydraulic reservoir towards atmospheric pressure; and
calculating the gas charge pressure PcalcGC of the hydraulic accumulator using the received pressure decay data of the hydraulic reservoir, wherein calculating the gas charge pressure PcalcGC of the hydraulic accumulator using the received pressure decay data comprises:
determining a rate change point within a pressure decay curve, and
multiplying the value of a rate change point of the received pressure decay data by a reservoir area ratio RAR of the hydraulic reservoir, wherein the RAR of the hydraulic reservoir is a ratio of a surface area of a low pressure piston head to a surface area of a high pressure piston head.