Abstract

Info

Title:: Input feedforward-feedback compounded compensation control of variable speed hydraulic power supply

Author(s):: MA Yu; GU Li-chen; School of Mechanical and Electrical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China

Keywords:: mechanical engineering; hydraulic power supply; input feedforward; feedback control; lag

Abstract:: Aiming at the hydraulic power supply of permanent magnet synchronous motor gear pump, when speed of the actuator was controlled, there were many problems such as serious lag and difficult adjustment due to the large inertia and many links of hydraulic system. Traditional closed-loop speed feedback control can not achieve satisfactory control effect. Input feedforward-feedback compounded compensation control strategy was proposed to realize the tracking control of the flow of hydraulic power supply under typical working conditions, and then to control the speed of actuator. The method was based on variable speed electromechanical hydraulic system experimental platform, to model the coupling relationship of electromechanical hydraulic parameters of hydraulic power source was deeply analyzed, model of the whole experimental platform was established, which realized the tracking control of the flow under the typical working conditions of the hydraulic power source (step, slope, sinusoidal dynamic change). The simulation and experimental results show that when the target flow changes dynamically (step, slope), the compounded compensation control strategy reduces the response time and dynamic error to 50% of the simple PID control. When the target flow sine changes, the response time and dynamic error are reduced to 30% of the simple PID feedback control, and the dynamic response characteristic of the system is greatly improved.