Title:
METHOD AND APPARATUS FOR CONTROLLING MULTIPLE VARIABLE DISPLACEMENT HYDRAULIC PUMPS
Document Type and Number:
WIPO Patent Application WO/2012/154462
Kind Code:
A3
Abstract:
A method and apparatus for controlling discharge pressure and pump displacement of a plurality of variable displacement hydraulic pumps (102, 103) having connected discharge ports (206) is provided. Each pump (102, 103) includes a swashplate (104) and a control valve (302) for controlling an angle of inclination of the swashplate. A desired first pump displacement control law is determined for a first pump (102) and determined a desired second pump discharge pressure control law for a second pump (103). The first control law is used to determine a first intermediate control variable. The second control law is used to determine a second intermediate control variable. The control of the first and second pumps (102, 103) are combined using the first and second intermediate control variables. A desired first control valve setting for the control valve (302) of the first pump is determined using the combined first and second intermediate control variables and the first control law. A desired second control valve setting for the control valve (302) of the second pump is determined using the combined first and second intermediate control variables and the second control law.
Inventors:
DU HONGLIU (US)
SULLIVAN PATRICK W (US)
SULLIVAN PATRICK W (US)
Application Number:
PCT/US2012/036084
Publication Date:
January 10, 2013
Filing Date:
May 02, 2012
Export Citation:
Assignee:
CATERPILLAR INC (US)
DU HONGLIU (US)
SULLIVAN PATRICK W (US)
DU HONGLIU (US)
SULLIVAN PATRICK W (US)
International Classes:
F15B13/02; F04B27/08; F15B13/06
Foreign References:
| US4809504A | 1989-03-07 | |||
| JPS63112137A | 1988-05-17 | |||
| US6374722B1 | 2002-04-23 | |||
| US5659485A | 1997-08-19 |
Attorney, Agent or Firm:
SPILLMAN, Daniel, M. et al. (Peoria, IL, US)
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