Electro-hydraulic proportional valve as well as position control system and method and fault prediction method thereof

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. 本发明涉及一种电液比例阀及其高精度位置控制系统、控制方法与故障预测方法，电液比例阀包括阀芯、比例电磁铁、位移传感器、电流控制器、位置控制器等主要部件，其高