In modern hydraulic control system, proportional servo valve, as a high-performance control element, is widely used in industrial automation, construction machinery, aerospace and other fields. It combines the high response characteristics of servo valve and the economy of proportional valve, and can realize continuous and accurate adjustment of pressure, flow and direction in hydraulic system.
The core of proportional servo valve is that it uses proportional electromagnet as driving element. Different from the traditional on-off solenoid valve, the output force of proportional electromagnet is proportional to the input current. By controlling the current, the displacement of the valve core can be accurately adjusted, so as to realize the continuous control of hydraulic parameters. This characteristic enables the proportional servo valve to adjust the output of the hydraulic system in real time according to the change of the control signal to meet the complex dynamic control requirements.
In the process of realizing continuous regulation, closed-loop feedback control technology plays a key role. Usually, the proportional servo valve is equipped with displacement sensor (such as LVDT) or pressure/flow sensor inside or outside, which can detect the spool position or system output parameters in real time and feed back the signal to the controller. According to the deviation between the set value and the actual value, the controller constantly adjusts the input current to maintain the stability and accuracy of the system output. For example, in the hydraulic cylinder position control, the proportional servo valve can continuously fine-tune the flow according to the feedback signal to realize the high-precision position control of the hydraulic cylinder.
In addition, the modern proportional servo valve is generally controlled by digital controller or PLC, which makes the control algorithm (such as PID control and fuzzy control) applied and further improves its regulation performance. Digital control not only improves the response speed and stability of the system, but also enhances the adaptive ability and fault diagnosis ability of the system.
The proportional servo valve can also realize multi-section control curve, slope control and other functions through software programming to meet the complex control requirements under different working conditions. This makes it have irreplaceable advantages in high-precision hydraulic systems such as injection molding machines, steel rolling equipment and test beds.
To sum up, the continuous adjustment of proportional servo valve depends on the comprehensive application of its advanced proportional electromagnetic drive technology, closed-loop feedback control mechanism and modern digital control means. With the development of control theory and electronic technology, the performance of proportional servo valve will continue to improve and play an important role in more high-end hydraulic control systems.