ENERGY RECOVERY SYSTEM HAVING ACCUMULATOR AND VARIABLE RELIEF

Title:

ENERGY RECOVERY SYSTEM HAVING ACCUMULATOR AND VARIABLE RELIEF

Document Type and Number:

WIPO Patent Application WO/2013/003049

Kind Code:

A3

Abstract:

A swing energy recovery system (50) for a machine (10) is disclosed. The swing energy recovery system may have a pump (58) configured to pressurize fluid, a motor (49) driven by a flow of pressurized fluid from the pump, and an energy recovery arrangement (104) configured to receive pressurized fluid discharged from the motor and selectively supply pressurized fluid to the motor. A selector valve (120), a charge valve (122), and a discharge valve (124) can be selectively used for charging and discharging at least one accumulator (108, 110). The swing energy recovery system may also have a pressure relief valve (146) associated with the motor, and a controller (100) in communication with the energy recovery arrangement and the pressure relief valve. The controller may be configured to selectively adjust a setting of the pressure relief valve based on an operating condition of the energy recovery arrangement.

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Inventors:

ZHANG JIAO (US)
CHEN DAYAO (US)
MA PENGFEI (US)
SHANG TONGLIN (US)
TOGNETTI LAWRENCE (US)
KUEHN JEFFREY (US)

Application Number:

PCT/US2012/042353

Publication Date:

February 28, 2013

Filing Date:

June 14, 2012

Export Citation:

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Assignee:

CATERPILLAR INC (US)
ZHANG JIAO (US)
CHEN DAYAO (US)
MA PENGFEI (US)
SHANG TONGLIN (US)
TOGNETTI LAWRENCE (US)
KUEHN JEFFREY (US)

International Classes:

F15B21/14; E02F9/22; F15B13/02

Foreign References:

US7908852B2	2011-03-22
JP2010203036A	2010-09-16
KR20100053665A	2010-05-20
US7269944B2	2007-09-18

Other References: