There are various classification methods for hydraulic servo systems based on different principles, and the most common ones are as follows:
(1) Classification based on different controlled physical quantities
According to the different controlled physical quantities, it can be divided into: ① position control system; ② Speed control system; ③ Force control system; ④ Other controlled output control systems. The most commonly used ones in engineering are the first three.
(2) Classify according to the different components that transmit signals (referring to input and deviation signals)
According to the different components that transmit signals (referring to input and deviation signals), they can be divided into: ① Electro hydraulic servo system (the components that transmit signals are electrical components); ② Mechanical hydraulic servo system (the component that transmits signals is a mechanical device); ③ Gas liquid servo system (the components that transmit signals are pneumatic components).
(3) Classification by hydraulic control components
According to the different hydraulic control components, it can be divided into: ① Valve control system (a system that uses the principle of throttling and relies on hydraulic servo valves to control the flow into the actuator); ② Pump control system (a system that uses a servo variable pump to change the pump displacement to control the flow into the actuator).
