Title:
METHOD FOR DETECTING UNCOMMANDED SPOOL VALVE POSITIONING AND STOPPING FLUID FLOW TO HYDRAULIC ACTUATOR
Document Type and Number:
Japanese Patent JP2018059632
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a system and method for detecting uncommanded positioning of at least one valve spool in a plurality of valve spools and stopping a fluid flow to a plurality of hydraulic actuators fluidly connected to the plurality of valve spools.SOLUTION: A method may comprise: a step of receiving a signal fluid pressure detected in a signal passage; a step of identifying whether or not at least one activation command is currently enabled; and a step of stopping a flow of fluid to a plurality of hydraulic actuators if no activation command is enabled for any of a plurality of valve spools and (1) the signal fluid pressure when detected upstream of the plurality of valve spools is larger than a first threshold or (2) the signal fluid pressure when detected downstream of the plurality of valve spools is smaller than a second threshold.SELECTED DRAWING: Figure 4
Inventors:
DAVID J LOMAX
JOSHUA D CALLAWAY
JOSHUA D CALLAWAY
Application Number:
JP2017192406A
Publication Date:
April 12, 2018
Filing Date:
October 02, 2017
Export Citation:
Assignee:
CATERPILLAR INC
International Classes:
F15B20/00; F15B11/08
Domestic Patent References:
| JP2006308073A | 2006-11-09 | |||
| JPH10281112A | 1998-10-20 | |||
| JP2014206022A | 2014-10-30 | |||
| JP2016114129A | 2016-06-23 | |||
| JP2012225050A | 2012-11-15 | |||
| JP2005265062A | 2005-09-29 | |||
| JP2008082539A | 2008-04-10 |
Foreign References:
| EP2541074A1 | 2013-01-02 |
Attorney, Agent or Firm:
Patent Business Corporation Tani/Abe Patent Office
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