EP 2703652 A1 20140305 - METHOD FOR CONTROLLING VARIABLE DISPLACEMENT PUMP
Title (en)
METHOD FOR CONTROLLING VARIABLE DISPLACEMENT PUMP
Title (de)
VERFAHREN ZUR STEUERUNG EINER VERDRÄNGERPUMPE
Title (fr)
PROCÉDÉ DE COMMANDE DE POMPE À DÉPLACEMENT VARIABLE
Publication
Application
Priority
JP 2012055315 W 20120302
Abstract (en)
A method for controlling a variable displacement pump by calculation by a controller using a closed-center-type directional control valve, the method allowing effective utilization of the variable displacement pump while avoiding the risk of engine stall is provided. [Means for Resolution] The method includes the steps of: determining a first virtual discharge pressure from the real discharge flow rate of the variable displacement pump based on a characteristic curve defining the relation between discharge pressure and discharge flow rate of the variable displacement pump; determining a virtual bleed-off flow rate based on a virtual bleed-off area of the closed-center-type directional control valves determined according to the operation amount of the directional control valves, and determining a second virtual discharge pressure of the variable displacement pump based on a value obtained by subtracting the actuator flow rate and the virtual bleed-off flow rate from the virtual discharge flow rate of the variable displacement pump; and controlling the variable displacement pump based on a smaller value of the first virtual discharge pressure and the second virtual discharge pressure.
IPC 8 full level
F15B 11/00 (2006.01); E02F 9/22 (2006.01); F04B 49/24 (2006.01); F15B 11/042 (2006.01)
CPC (source: EP KR)
E02F 9/2235 (2013.01 - EP); E02F 9/2296 (2013.01 - EP); F04B 49/00 (2013.01 - KR); F04B 49/24 (2013.01 - EP); F15B 11/00 (2013.01 - KR); F15B 11/0423 (2013.01 - EP); F15B 2211/20523 (2013.01 - EP); F15B 2211/20553 (2013.01 - EP); F15B 2211/3111 (2013.01 - EP); F15B 2211/6326 (2013.01 - EP); F15B 2211/6333 (2013.01 - EP); F15B 2211/634 (2013.01 - EP); F15B 2211/6346 (2013.01 - EP); F15B 2211/6652 (2013.01 - EP)
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
DOCDB simple family (publication)
EP 2703652 A1 20140305; EP 2703652 A4 20150715; EP 2703652 B1 20171004; CN 103688064 A 20140326; CN 103688064 B 20160120; JP 5877616 B2 20160308; JP WO2013128622 A1 20150730; KR 101638339 B1 20160712; KR 20130142187 A 20131227; WO 2013128622 A1 20130906
DOCDB simple family (application)
EP 12870275 A 20120302; CN 201280021242 A 20120302; JP 2012055315 W 20120302; JP 2014501920 A 20120302; KR 20137029809 A 20120302