Electro-hydraulic proportional valve as well as position control system and method and fault prediction method thereof
An electro-hydraulic proportional valve and fault prediction technology, applied in the field of proportional valves, can solve the problems of low control accuracy and difficult fault diagnosis of proportional valves, and achieve the effect of high-precision position control and accurate fault prediction
Active Publication Date: 2021-09-24
NANJING INST OF TECH +2
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[0006] In order to solve the problems of low control precision and difficult fault diagnosis of proportional valves in the prior art, an electro-hydraulic proportional valve and its high-precision position control and fault prediction method are provided. The technical scheme adopted in the present invention is as follows:
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[0031] The present invention is described in further detail now in conjunction with accompanying drawing.
[0032] The object of the present invention is to overcome the deficiencies of the prior art, and provide an electro-hydraulic proportional valve and its high-precision position control and fault prediction method. Among them, the electro-hydraulic proportional valve mainly includes a valve core 1, a valve sleeve 2, a proportional electromagnet 3, a displacement sensor 4 and an integrated amplifier, and the integrated amplifier 5 mainly includes a current controller 6, a position controller 7 and a communication port 8; the command signal The calculated control signal is sent to the proportional electromagnet 3 through the communication port 8 via the position controller 7 and the current controller 6 to drive the spool 1 to move, and the displacement sensor 4 passes the collected displacement signal of the spool 1 through the communication port 8. The communication port ...
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The invention relates to an electro-hydraulic proportional valve as well as a high-precision position control system and method and a fault prediction method thereof. The electro-hydraulic proportional valve comprises a valve element, a proportion electro-magnet, a displacement sensor, a current controller, a position controller and other main components, wherein the high-precision position control system mainly comprises a position control loop, a position feedforward link, a current control loop, a pulse width modulation link and the like, and a CNN+BiLSTM network structure is adopted to conduct fault prediction on the electro-hydraulic proportional valve. Compared with the prior art, high-precision position control of the electro-hydraulic proportional valve can be achieved, and accurate fault prediction can be conducted on the electro-hydraulic proportional valve when position control is abnormal through a trained network model.
Description
technical field [0001] The invention belongs to the technical field of proportional valves, and in particular relates to an electro-hydraulic proportional valve and its high-precision position control system, control method and fault prediction method. Background technique [0002] The electro-hydraulic proportional valve is the core component of the hydraulic servo system, and its performance and usage directly determine the performance of the entire system. The basic principle of electro-hydraulic proportional valve control is to use the magnitude of the electromagnet's stroke force to be proportional to its current, and to control the hydraulic pressure and flow by controlling the magnitude of the electromagnet current flowing through the proportional valve. [0003] The current proportional controller mainly uses the pulse width modulation technology to control the electromagnetic coil current of the proportional valve, but this analog circuit control method is gradually...
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IPC IPC(8): F16K11/07F16K31/06F16K37/00F15B19/00G06F30/17G06F30/27G06N3/04G06N3/08
CPCF16K11/07F16K31/0675F16K31/0613F16K37/0083F15B19/007F15B19/005G06F30/17G06F30/27G06N3/084G06N3/044G06N3/045Y02P90/02
Inventor陈立娟俞奇魏立忠高伟李瑞阳张苏南彭泽钦艾超
OwnerNANJING INST OF TECH