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Fault isolation and decontamination procedures for electrohydraulic valves

  • US 9,658,626 B2
  • Filed: 12/23/2013
  • Issued: 05/23/2017
  • Est. Priority Date: 12/26/2012
  • Status: Active Grant
First Claim
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1. A method for isolating a fault condition or a blocked work port in an electco-hydraulic system comprising:

  • (a) setting a system pump to a first predetermined pressure;

    (b) commanding a valve assembly to a center position;

    (c) recording a center position (xc) of the valve;

    (d) opening the valve assembly to place a work port associated with the valve in fluid communication with the pump;

    (e) recording a first end position (xp) of the valve, a first work port pressure (P1), and a first pump supply pressure (Ps);

    (f) opening the valve assembly to place the work port in fluid communication with a tank reservoir;

    (g) recording a second end position (xt) of the valve and a fluid pressure (Plow) associated with the work port;

    (h) setting the pump to a second predetermined pressure;

    (i) opening the valve assembly to place the work port in fluid communication with the pump;

    (j) measuring a second work port pressure (P2) and a second system pump pressure (Ps2) associated with the pump; and

    (k) analyzing the recorded and measured data to identify the fault condition or blocked work port, including comparing the second work port pressure (P2) to the second system pump pressure (Ps2) and by comparing the recorded first work port pressure (P1) to the second system pump pressure (Ps2).

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