Abstract
The electro-hydraulic proportional position servo system is a kind of highly non-linear and time-varying system as well as parameter uncertainties. It is often difficult to achieve satisfactory control results with the traditional control methods. Considering that the adaptive neural network PID control method has the characteristics of online learning and adjustment PID control parameters adaptively, this paper puts forward to adopt BP-PID control method for the position servo control of electro-hydraulic proportional system. An online adaptive BP-PID controller is designed. The simulation model of the system is established based on Simulink platform. The step response and Sinusoidal tracking characteristics are researched for electro-hydraulic proportional position servo system by using traditional PID and BP-PID control algorithms through simulations and experiments. The results show that BP-PID has a strong ability of online learning and self-tuning PID parameters. Compared with the traditional PID control method, the BP-PID control has strong self-adaptability and robustness, and can significantly improve the step response speed and tracking control precision.
Highlights
The electro-hydraulic proportional position servo system is extensively used in production and experiment at present
This paper presents a kind of BP-PID control method for the position servo control of electro-hydraulic proportional system
The simulation model is established based on Simulink, and the BP-PID controller is developed based on Labview virtual instrument development platform
Summary
The electro-hydraulic proportional position servo system is extensively used in production and experiment at present. Li and Ding have studied the position servo control of the electro-hydraulic proportional system. The simulation and experimental results proved that the BP-PID control method can achieve performance optimization through self-learning and self-tuning the PID parameters, the response speed and control accuracy of which are superior to the traditional PID control. Its basic working principle is as follow, the hydraulic oil flows into electrohydraulic proportional directional valve after being pressurized by quantitative pump, subsequently, the pressurized hydraulic oil flows into the hydraulic cylinder to push the piston rod move. The component parameters of simulation model are set based on CQYZ-D electro-hydraulic proportional control test bench established in this paper. The components needed to set parameter mainly include servo cylinder, electro-hydraulic proportional directional control valve and quantitative pump etc. The name of hydraulic oil is HyJet-4A, the oil density is 981.986 kg/m3, the coefficient of viscosity is 10.0367, the bulk modulus of elasticity is 1.2586e9 Pa
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