Algorithm

Control (management)

Engineering

Hydraulic machinery

Aerospace engineering

Automation

Control engineering

Computer security

Computer science

Aerospace

Mechanical engineering

Development (topology)

Mathematics

Mathematical analysis

Artificial intelligence

Control valves

State (computer science)

Key (lock)

Chinese Journal of Mechanical Engineering

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.

Research and Development of Electro-hydraulic Control Valves Oriented to Industry 4.0: A Review