Abstract
Electro-hydraulic control valves are key hydraulic components for industrial applications and aerospace, which controls electro-hydraulic motion. With the development of automation, digital technology, and communication technology, electro-hydraulic control valves are becoming more digital, integrated, and intelligent in order to meet the requirements of Industry 4.0. This paper reviews the state of the art development for electro-hydraulic control valves and their related technologies. This review paper considers three aspects of state acquisition through sensors or indirect acquisition technologies, control strategies along with digital controllers and novel valves, and online maintenance through data interaction and fault diagnosis. The main features and development trends of electro-hydraulic control valves oriented to Industry 4.0 are discussed.
Highlights
With the development of materials, manufacturing, electronic technology, and computer technology, more power has been injected into electro-hydraulic control valves along with new demands
5 Conclusions Electro-hydraulic control valves experienced a longtime development from a pure mechanical structure to mechatronics hydraulics integration
Electrohydraulic control valves are currently being integrated with digital technology and a variety of communication technologies
Summary
Since Pascal put forward the basic law of pressure transfer for static liquid, this concept has been developed for nearly four centuries. With the development of materials, manufacturing, electronic technology, and computer technology, more power has been injected into electro-hydraulic control valves along with new demands. The abilities of self-detection, fault diagnosis, function redefining, and integration should be added into valves for Industry 4.0. Digital technologies can make hydraulic valves accessible to the embedded system and they are linked to computers or mobile terminals. The demand for Industry 4.0 to achieve valve self-diagnosis is not limited to the detection of simple faults such as electronic faults with sensors. Sensor technologies used on electro-hydraulic valves, which are the basis for state acquisition and diagnosis, are stated and some indirect state acquisition methods are presented. Integrated communication technology and management software used for electro-hydraulic valves are summarized, which allows online remote monitoring, controlling, managing, and fault diagnosis possible. Intelligent diagnosis methods for the inner faults of electro-hydraulic valves are reviewed, which includes data-based and model-based fault diagnosis methods
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