Global Patent Index - EP 3748155 A1

EP 3748155 A1 20201209 - HYDRAULIC MACHINES AND SYSTEMS

Title (en)

HYDRAULIC MACHINES AND SYSTEMS

Title (de)

HYDRAULISCHE MASCHINEN UND SYSTEME

Title (fr)

MACHINES ET SYSTÈMES HYDRAULIQUES

Publication

EP 3748155 A1 20201209 (EN)

Application

EP 20178359 A 20200604

Priority

EP 19178292 A 20190604

Abstract (en)

A hydraulic system employing an electronically commutated fluid working machine having a plurality of working chambers, each having one or more electronically controllable valves which are actively controlled by at least one controller to regulate the net displacement of working fluid into or out of low- and high-pressure manifolds on a cycle by cycle basis, to meet a demand indicated by a demand signal. The high-pressure manifold has at least one additional outlet, regulated by an electronically controllable outlet valve, such as a proportional flow valve. If the demand indicated by the demand signal would be expected to cause pulsatile flow or vibrations which may excite resonant modes, the at least one controller causes the displacement of working fluid by the working chambers to be in excess of the demand indicated by the demand signal, and the at least one controller simultaneously (at least partially) opens an electronically controllable outlet valve to allow some of the excess flow to leave therethrough, such that the net displacement of fluid meets the demanded displacement of fluid, while mitigating the pulsatile flow or undesirable vibrations.

IPC 8 full level

F04B 1/04 (2020.01); F04B 1/053 (2020.01); F04B 1/06 (2020.01); F04B 7/00 (2006.01); F04B 49/06 (2006.01)

CPC (source: CN EP KR US)

B66F 9/22 (2013.01 - KR); F01B 15/005 (2013.01 - US); F01B 25/08 (2013.01 - US); F03C 1/0447 (2013.01 - CN); F03C 1/053 (2013.01 - CN); F04B 1/0452 (2013.01 - EP); F04B 1/047 (2013.01 - US); F04B 1/053 (2013.01 - CN EP); F04B 1/06 (2013.01 - CN EP); F04B 7/0076 (2013.01 - EP); F04B 49/065 (2013.01 - CN EP); F04B 49/22 (2013.01 - CN); F04B 53/10 (2013.01 - US); F15B 11/00 (2013.01 - CN); F15B 13/02 (2013.01 - CN); F15B 13/021 (2013.01 - KR); F15B 13/022 (2013.01 - KR); F15B 13/0401 (2013.01 - KR); F15B 13/0807 (2013.01 - KR); F15B 13/085 (2013.01 - KR); F15B 15/202 (2013.01 - KR); F15B 2015/206 (2013.01 - KR); F15B 2211/20546 (2013.01 - KR); F15B 2211/20592 (2013.01 - KR); F15B 2211/251 (2013.01 - KR); F15B 2211/252 (2013.01 - KR)

Citation (search report)

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 3748155 A1 20201209; EP 3748155 B1 20221019; EP 3748155 B8 20221207; CN 112112776 A 20201222; JP 2020197304 A 20201210; KR 20200140203 A 20201215; US 2020386101 A1 20201210

DOCDB simple family (application)

EP 20178359 A 20200604; CN 202010495511 A 20200603; JP 2020096972 A 20200603; KR 20200067213 A 20200603; US 202016892474 A 20200604