A multifunctional electro-hydraulic flow control valve, comprising a main valve (2) and a proportional pilot valve (12), wherein a flow sensor, a multifunctional valve controller (21), a control cavity pressure sensor (17), an oil inlet pressure sensor (18), an oil outlet pressure sensor (19), a temperature sensor (20), and a cloud storage (30) are additionally provided;
- the main valve (2) comprises a main valve core (1), a main valve spring (3), a main valve oil inlet cavity VA, a main valve oil outlet cavity VB, and a main valve control cavity VC, a main valve oil inlet A is in communication with a feedback groove M through an internal flow channel of the main valve core (1), the feedback groove M is in communication with the main valve control cavity VC through a throttling edge on a valve sleeve, the main valve control cavity VC is in communication with a flow sensor oil inlet B, a flow sensor oil outlet C is in communication with a pilot valve oil inlet H, and a pilot valve oil outlet F is in communication with a main valve oil outlet D;
- the control cavity pressure sensor (17) is in communication with the main valve control cavity VC;
- the oil inlet pressure sensor (18) is in communication with the main valve oil inlet A;
- the oil outlet pressure sensor (19) is in communication with the main valve oil outlet D;
- and the temperature sensor (20) is in communication with the main valve oil outlet D;
- the proportional pilot valve (12) comprises a pilot valve core (11), a pilot valve spring (10), a pilot valve electromagnet (13), a proportional amplifier (14), a flow controller (15), and a displacement sensor (16), an output end of the proportional amplifier (14) is connected to the pilot valve electromagnet (13), the flow controller (15) receives a flow setting signal qs and a flow feedback signal qf, an output end of the flow controller (15) is connected to an input end of the proportional amplifier (14), the displacement sensor (16) detects displacement of the pilot valve core (11), and outputs a pilot valve core displacement signal y to a feedback end of the proportional amplifier (14);
- the multifunctional valve controller (21) comprises a signal processing module (22), a calculation module (23), an integration module (24), a data storage module (25), a control module (26), a display module (27), a fault prediction module (28), and a communication interaction module (29);
- the signal processing module (22) comprises a digital filter and a normalization processor, wherein the pilot valve core displacement signal y, a control cavity pressure signal pC, an oil inlet pressure signal pA, an oil outlet pressure signal pB, a flow sensor signal qp, and a temperature sensor signal T are connected to the digital filter of the signal processing module, an output signal of the digital filter is connected to the normalization processor, an output signal of the normalization processor is connected to an output end of the signal processing module, the output end of the signal processing module is connected to the calculation module (23) and an input end of the data storage module (25);
- an output end of the calculation module (23) is connected to an input end of the integration module (24) and the input end of the data storage module (25);
- the calculation module (23) inputs the calculated flow feedback signal qf to a feedback end of the flow controller (15);
- an output end of the integration module (24) is connected to the input end of the data storage module (25), the data storage module (25) is connected to an input end of the control module (26), an input end of the display module (27), an input end of the fault prediction module (28) and an input end of the communication interaction module (29) through a bidirectional data bus;
- and an output end of the communication interaction module (29) is connected to the cloud storage (30);
- the control module (26) calculates the flow setting signal qs and inputs the flow setting signal qs to an input end of the flow controller (15);
- and the control module (26) calculates a flow sensor compensation signal uz and inputs the signal to an electro-mechanical converter of the flow sensor;
- the flow sensor is connected between the main valve control cavity VC and the pilot valve oil inlet H, the main valve control cavity VC is in communication with the pilot valve oil inlet H, the pilot valve oil outlet F is in communication with the flow sensor oil inlet B, and the flow sensor oil outlet C is in communication with the main valve oil outlet D;
- the calculation module (23) calculates following parameters according to a calculation formula (1), a calculation formula (2), a calculation formula (3), a calculation formula (4), a calculation formula (5) and a calculation formula (6):
- main valve flow q=(g(x)+1)·qb (1)
- pressure difference between an inlet and an outlet of the main valveΔp=PA−PB (2)
- main valve input power P1=PA·q (3)
- main valve output power P2=PB·q (4)
- main valve throttling loss power P3=Δp·q (5)
- flow feedback signal qf=k·qb (6);
- the integration module performs integral calculation to obtain following parameters according to a formula (7), a calculation formula (8), a calculation formula (9) and a calculation formula (10):
- main valve input energy E1=∫01P1dt (7)
- main valve output energy E2=∫01P2dt (8)
- main valve throttling loss energy E3=∫01P3dt (9)
- main valve efficiencyη=E2/E1 (10);
- in the formulae, g(x) refers to flow amplification coefficient, qb refers to flow sensor signal, pA refers to oil inlet pressure signal, pB refers to oil outlet pressure signal, and k refers to flow feedback gain;
- the fault prediction module (28) performs active operation and maintenance and fault early warning on an integrated unit according to the stored main valve input power P1, the main valve input energy E1, the oil inlet pressure signal pA and the oil outlet pressure signal pB;
- once the accumulated energy reaches a fault alarm threshold gy, the system actively performs detection and maintenance, completes identification work from fault characteristics to fault causes, accurately gives fault location and analyzes fault diagnosis results, and is capable of predicting a service life of the valve, diagnosis and prediction results are transmitted to the data storage module, and the display module (27) displays information stored in the data storage module (25) in real time.