Velocity and position compound control system for pump-valve dual-source driven hydraulic cylinder

A velocity and position compound control system for a pump-valve dual-source driven hydraulic cylinder, comprising:

• a first power source, a first hydraulic pump, a second power source, a second hydraulic pump, a safety valve, a proportional directional valve, a pilot operated check valve, a single-rod hydraulic cylinder, a handle, a tank, a rotating speed sensor, a first pressure sensor, a second pressure sensor, a third pressure sensor, a temperature sensor, a position transmitting unit, magnetic induction marks, a count correction module, an integrator module, a calculation control module, a signal acquisition module, a data storage module, a cloud memory, a communication protocol module, a fault diagnosis module, and a process monitoring module, wherein
• a P port of the proportional directional valve is connected to the first pressure sensor, the temperature sensor, and an outlet port of the first hydraulic pump;
• an A port of the proportional directional valve is connected to a rodless chamber of the single-rod hydraulic cylinder and the second pressure sensor;
• a B port of the proportional directional valve is connected to a rod chamber of the single-rod hydraulic cylinder and the third pressure sensor;
• the inlet and outlet ports of the pilot operated check valve are connected to an outlet port of the proportional directional valve and the tank, respectively;
• and the inlet and outlet ports of the second hydraulic pump are connected to the rodless chamber and the rod chamber of the single-rod hydraulic cylinder, respectively, and the second power source is provided with the rotating speed sensor;
• and
• the signal acquisition module receives a rotating speed n2 of the second power source, an oil temperature T, an outlet pressure ps of the first hydraulic pump, a rodless-chamber pressure pA of the single-rod hydraulic cylinder, a rod-chamber pressure pp of the single-rod hydraulic cylinder, and an output signal u of the handle, and an output port of the signal acquisition module is connected to the calculation control module and the data storage module;
• an output port of the calculation control module is connected to the integrator module and the data storage module, and transmits a control signal to the second power source, the proportional directional valve, the pilot operated check valve, and the first hydraulic pump;
• an output port of the integrator module is connected to the count correction module and the data storage module;
• the count correction module receives an output signal of the position transmitting unit, and an output signal of the count correction module is connected to the calculation control module;
• the data storage module is connected to the communication protocol module, the fault diagnosis module, and the process monitoring module;
• and the communication protocol module is connected to the cloud memory.