Study On The Structure Design And Control System Of Digital Flow Valve Based On Microcontroller

With the electro-hydraulic servo system and computer technology, computer-controlled electro-hydraulic servo system with a combination of technology becoming more and more closely, the digital hydraulic servo control system began to emerge, and the increasingly rapid development of its hydraulic control system advantages become increasingly evident. And the digital valves of digital electro-hydraulic servo valve control system as the core component, has also become the main target of research.Digital electro-hydraulic control valve (referred to as the Digital valves) is a type of digital signal directly controlled by the pressure, flow rate and direction of the liquid valve. Compared with electro-hydraulic servo valve, digital valve there are many outstanding advantages, such as directly with the computer interface, not D / A conversion, simple; cheap; strong anti-pollution, simple operation and maintenance; and digital output valve can be pulse frequency or width regulation, anti-interference ability; get higher precision open-loop control.designed a type of digital flow control valve to its simple structure, easy to control, reduce manufacturing costs valve. In this paper, the flow of the design of the structure of the digital valve spool can rotate when the spool valve to change the flow passage area of exports to the regulation of the flow. After analysised Valve's the structure, come to the point of view of the rotating spool and valve orifice area of the relations function, transform the control of flow to the control of stepper motor's rotation angle, making it easy to control, feasible. As the valve' flow of the port is also affected by the pressure of import and export .so the flow valve in the import, export, respectively, to set up a pressure sensor for data collection.Through the study of the structure of valves in order to easily control the design of the control system of the principle of the hardware circuitry and software. Microcontroller is the core of the Digital valve control system. Pressure sensor, microcontroller, stepper motor, as well as their common component interface circuit of the digital valve control system.