Patent ID: 9658626
Date: 2017-05-23
CPC Classifications: F15B,G05D,Y10T

Claim:
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 (P (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 (P (k) analyzing the recorded and measured data to identify the fault condition or blocked work port, including comparing the second work port pressure (P