Condition Monitoring of a Hydraulic Valve Through On-Line Estimation of the Valve Orifice Area Profile 2000-01-2594
Flow rate monitoring plays a crucial role for precise motion control in many hydraulic systems and for detection of faults and fluid loss in hydraulic system components and circuits. In some situations, however, direct measurement of fluid flow is not possible. Besides, flowmeters are generally non-robust, expensive, and slow in response. In this paper, we have proposed an alternative approach to direct flow measurement for circuits that contain a combination of proportional valves and actuators. A nonlinear state-space representation is used to model the valve orifice area variation with respect to the valve spool position. Kalman Filtering is then utilized to estimate the valve's orifice area in real-time by fusing data from robust low-cost pressure transducers and position sensors. A close agreement is achieved between the estimated and the measured orifice areas for a valve with a complex wedge-shape orifice profile. The orifice area estimate also revealed that the valve spool was not centered at its null (zero) position, which is considered as a flaw in the valve.
Citation: Zavarehi, M., Sassani, F., and Lawrence, P., "Condition Monitoring of a Hydraulic Valve Through On-Line Estimation of the Valve Orifice Area Profile," SAE Technical Paper 2000-01-2594, 2000, https://doi.org/10.4271/2000-01-2594. Download Citation
Author(s):
Masoud K. Zavarehi, Farrokh Sassani, Peter D. Lawrence
Affiliated:
Automated Analysis Corporation, University of British Columbia
Pages: 10
Event:
International Off-Highway & Powerplant Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Topics in Hydraulics-SP-1554, SAE 2000 Transactions Journal of Commercial Vehicles-V109-2
Related Topics:
Hydraulic systems
Valves
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