Research on Energy Transmission Mechanism of the Electro-Hydraulic Servo Pump Control System

Abstract

The electro-hydraulic servo pump control system (EHSPCS) is a volume control system that uses a permanent magnet synchronous motor (PMSM) with a fixed displacement pump to directly drive and control the hydraulic cylinder. The energy transmission law of the system is very complicated due to the transformation of electrical, mechanical and hydraulic energy as well as other energy fields, and qualitative analysis of the energy transfer efficiency is difficult. Energy transfer analysis of the EHSPCS under different working conditions and loads is proposed in this paper. First, the energy flow transfer mechanism was analyzed, and the mathematical and energy transfer models of the key components of the system were established to explore the energy characteristic state transition rule. Second, a power bond diagram model was built, its state equation and state matrix were deduced, and a system simulation model was built. Finally, combined with the EHSPCS experimental platform, simulation experiments were carried out on the dynamic position following and steady-state position holding conditions of the system, and the variation rules of the power of each energy characteristic state and the system energy transfer efficiency under different loads were obtained. The research results provide a foundation for the study of power matching and energy-saving mechanism of the EHSPCS.

Review of the Progress of Energy Saving of Hydraulic Control Systems

“…The improvement methods of the pump control system mainly focus on two aspects: the improvement of the hydraulic circuit and the optimization of the control strategy. For the problems of asymmetric flow and nonlinearity in hydraulic control systems, which are caused by defects in the system composition, improvements can be made by optimizing the hydraulic circuit to reduce the impact of these problems on system energy loss; for problems such as low steering accuracy, tracking of system uncertainty, external load disturbance, and nonlinear flexible transmission laws in hydraulic control systems, these problems are caused by the algorithm of control system components and can be solved by changing the control strategy of the original system [49,50].…”

Artificial bee colony algorithm based PID controller for steel stripe deviation control system

“…The hydraulic cylinder can be approximated as a second-order transfer function. 24 Where kh is the gain of the hydraulic cylinder, τh is the time constant of the hydraulic cylinder.…”

Electro-Hydraulic Servo-Pumped Active Disturbance Rejection Control in Wind Turbines for Enhanced Safety and Accuracy

“…Due to the elimination of the throttle valve, the oil circuit is more simple, and the energy loss is greatly reduced. At the same time, the servo pump control also has high control accuracy and good dynamic response, and adaptability, as well as other advantages making it especially suitable for wind power generation, such as reliability and the environmental adaptability of the application of high requirements [12][13][14][15].…”