EP 2657537 A2 20131030 - A hydraulic system
Title (en)
A hydraulic system
Title (de)
Hydraulisches System
Title (fr)
Système hydraulique
Publication
Application
Priority
GB 201207161 A 20120424
Abstract (en)
A method of operating a hydraulic system including providing a hydraulic pump (32,232,332) having a pump outlet, a main orifice (43,243A,243B) having a main orifice inlet in fluid communication with the pump outlet and a main orifice outlet for supplying pressurised fluid to a service, a flow orifice (44,244,344) having a flow orifice inlet for sensing a pressure representative of a pressure at the pump outlet and a flow orifice outlet, an amplification orifice (45,245,345) having an amplification orifice inlet in fluid communication with the flow orifice outlet and an amplification orifice outlet for sensing a pressure representative of a pressure at a service, means (63,263,363) for generating an output signal representative of a fluid pressure between the flow orifice outlet and the amplification orifice inlet, and a pump controller (64,270,395) for controlling the hydraulic pump in response to the output signal, the flow orifice defining a flow orifice cross section area and the amplification orifice defining an amplification orifice cross section area, the flow orifice cross section area and the amplification orifice cross section area defining a ratio, in which the main orifice is variable and the ratio is variable, the method further comprising the steps of operating the system in a first mode so as to define a first mode ratio and operating the system in a second mode so as to define a second mode ratio, so that the ratio is controlled differently in the first mode and the second mode.
IPC 8 full level
F15B 11/16 (2006.01)
CPC (source: EP GB US)
E02F 9/2264 (2013.01 - GB); E02F 9/2296 (2013.01 - GB); F04B 49/00 (2013.01 - US); F15B 11/02 (2013.01 - GB); F15B 11/165 (2013.01 - EP US); F15B 13/02 (2013.01 - GB); F15B 11/168 (2013.01 - EP US); F15B 2211/20538 (2013.01 - EP US); F15B 2211/20546 (2013.01 - EP US); F15B 2211/253 (2013.01 - EP US); F15B 2211/40507 (2013.01 - EP US); F15B 2211/40515 (2013.01 - EP US); F15B 2211/50536 (2013.01 - EP US); F15B 2211/6051 (2013.01 - EP US); F15B 2211/6058 (2013.01 - EP US); F15B 2211/651 (2013.01 - EP US); F15B 2211/653 (2013.01 - EP US)
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
DOCDB simple family (publication)
EP 2657537 A2 20131030; EP 2657537 A3 20160309; CN 103375450 A 20131030; GB 201207161 D0 20120606; GB 2501486 A 20131030; JP 2013228101 A 20131107; US 2013280097 A1 20131024
DOCDB simple family (application)
EP 13162367 A 20130404; CN 201310146043 A 20130424; GB 201207161 A 20120424; JP 2013089397 A 20130422; US 201313866757 A 20130419