Title:
HYDRAULIC CONTROL SYSTEM HAVING ENERGY RECOVERY
Document Type and Number:
WIPO Patent Application WO/2012/082326
Kind Code:
A3
Abstract:
A hydraulic control system (48) for a machine (10) is disclosed. The hydraulic control system (48) may have a tank (64), a pump (51) configured to draw fluid from the tank (64) and pressurize the fluid, a swing motor (43) configured to receive the pressurized fluid and swing a body (38) of the machine relative to an undercarriage (39), and a tool actuator (32) configured to receive the pressurized fluid and move a tool (14) relative to the body. The hydraulic control system (48) may also have an energy recovery device (122) configured to convert hydraulic energy to mechanical energy, a first accumulator (138) configured to store waste fluid received from the swing motor (43), and a second accumulator (130) configured to store waste fluid received from the tool actuator. Stored waste fluid from at least one of the first (138) and second accumulators (130) may be selectively discharged into the energy recovery device (122).
Inventors:
SHANG TONGLIN (US)
ZHANG JIAO (US)
MA PENGFEI (US)
ZHANG JIAO (US)
MA PENGFEI (US)
Application Number:
PCT/US2011/061777
Publication Date:
October 26, 2012
Filing Date:
November 22, 2011
Export Citation:
Assignee:
CATERPILLAR INC (US)
SHANG TONGLIN (US)
ZHANG JIAO (US)
MA PENGFEI (US)
SHANG TONGLIN (US)
ZHANG JIAO (US)
MA PENGFEI (US)
International Classes:
F15B21/14; E02F9/22; F15B13/042; F15B21/08
Foreign References:
| JP2010084888A | 2010-04-15 | |||
| JP2004324743A | 2004-11-18 | |||
| JP2010121726A | 2010-06-03 | |||
| JP2007040393A | 2007-02-15 |
Attorney, Agent or Firm:
SPILLMAN, M. Daniel et al. (Peoria, IL, US)
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