Abstract
Solenoid valves are widely used to control fluid flow in various mechanical systems. If the valves do not function properly, the mechanical systems can lose their ability to control the fluid flow. This paper describes a fault detection method that can monitor coil burnout under dynamic thermal loading. The method consists of three steps. First, an equivalent current model of the solenoid valves is derived from Kirchhoff's voltage law. Then, a predictive regression model is developed to describe the relationship between the electric current and the dynamic change of operating temperature of the valves. Finally, a health indicator of solenoid coil burnout is devised in conjunction with the derived model. To demonstrate the validity of the proposed fault detection method, a case study is presented with solenoid valves taken from real braking systems of urban railway vehicles. The case study confirms that the proposed method can detect the coil burnout independent of the operating temperature. We anticipate that the proposed method can be widely applicable to diagnose any electromagnetic actuator of engineered systems as well as solenoid valves in various industrial applications.
Highlights
Solenoid valves are used to change the path of fluids and to control fluid pressure or flowrate, depending on control voltage magnitudes
This paper proposes a model-based fault detection method that can monitor coil burnout in solenoid valves under dynamic thermal loading
This study proposed a model-based fault detection method for oil burnout in a solenoid valve subjected to dynamic thermal loading
Summary
Solenoid valves are used to change the path of fluids and to control fluid pressure or flowrate, depending on control voltage magnitudes. System temperature changes can result in deviations to the acquired data, leading to errors in the results of the fault detection [15]–[17] With this motivation, this paper proposes a model-based fault detection method that can monitor coil burnout in solenoid valves under dynamic thermal loading. Jo et al.: Model-Based Fault Detection Method for Coil Burnout in Solenoid Valves Subjected to Dynamic Thermal Loading external temperature environment; the other is the Joule heating of the coil during operation. The effects of these factors on the supply current change are modeled.
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