Title:
HYDRAULIC ACCUMULATOR FLUID CHARGE ESTIMATION SYSTEM AND METHOD
Document Type and Number:
WIPO Patent Application WO/2013/009467
Kind Code:
A3
Abstract:
A method for estimating a fluid charge of a hydraulic accumulator includes determining a first accumulator pressure at a first time with a pressure sensor, the first time during accumulator charging; determining a second accumulator pressure at a second time with the pressure sensor (296), the second time during accumulator charging; determining a first fan speed at the first time; determining a second fan speed at the second time; and estimating the fluid charge of the hydraulic accumulator as a function of the first accumulator pressure, the second accumulator pressure, the first fan speed, and the second fan speed.
Inventors:
NELSON BRYAN E (US)
PETERSON JEREMY T (US)
KUEHN JEFFREY L (US)
PETERSON JEREMY T (US)
KUEHN JEFFREY L (US)
Application Number:
PCT/US2012/044287
Publication Date:
March 07, 2013
Filing Date:
June 27, 2012
Export Citation:
Assignee:
CATERPILLAR INC (US)
NELSON BRYAN E (US)
PETERSON JEREMY T (US)
KUEHN JEFFREY L (US)
NELSON BRYAN E (US)
PETERSON JEREMY T (US)
KUEHN JEFFREY L (US)
International Classes:
F15B19/00; E02F9/22; F15B1/02
Domestic Patent References:
| WO2010083816A1 | 2010-07-29 |
Foreign References:
| JPH01131301A | 1989-05-24 | |||
| JP2008133848A | 2008-06-12 | |||
| US20080295507A1 | 2008-12-04 |
Attorney, Agent or Firm:
ROBERSON, Keith, P. et al. (Peoria, IL, US)
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