Title:
HYDRAULIC CONTROL SYSTEM HAVING FLOW FORCE COMPENSATION
Document Type and Number:
WIPO Patent Application WO/2010/075216
Kind Code:
A3
Abstract:
A hydraulic control system (28) for a machine (10) is disclosed. The hydraulic control system may have a pump (38) configured to pressurize fluid, a displacement control valve (58) configured to affect displacement of the pump, and a tool control valve (68) configured to receive pressurized fluid from the pump and to selectively direct to the pressurized fluid to a hydraulic actuator. The hydraulic control system may also have a controller (34) in communication with the displacement control valve. The controller may be configured to determine a pressure gradient across the tool control valve substantially different than a desired pressure gradient, determine a desired condition of the displacement control valve based the pressure gradient, and determine a flow force applied to the displacement control valve based on the desired condition. The controller may be further configured to generate a load sense response signal directed to the displacement control valve based on the desired condition and the flow force.
Inventors:
KRAJNIK ANDREW J (US)
SULLIVAN PATRICK W (US)
SULLIVAN PATRICK W (US)
Application Number:
PCT/US2009/068749
Publication Date:
October 14, 2010
Filing Date:
December 18, 2009
Export Citation:
Assignee:
CATERPILLAR INC (US)
KRAJNIK ANDREW J (US)
SULLIVAN PATRICK W (US)
KRAJNIK ANDREW J (US)
SULLIVAN PATRICK W (US)
International Classes:
E02F9/22; E02F9/20; F15B7/10; F15B11/05; F15B13/02
Foreign References:
| EP0761491A2 | 1997-03-12 | |||
| EP0715031A2 | 1996-06-05 | |||
| EP0879968A1 | 1998-11-25 | |||
| EP0810497A1 | 1997-12-03 |
Attorney, Agent or Firm:
TROUSDALE, Jonathan V. et al. (Peoria, IL, US)
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