Energy Management Of Hydraulic Multi-source Network System

With the impact of energy saving and energy saving and energy crisis,the energy saving of hydraulic systems has become the top priority in term of building green manufacturing and revitalizing manufacturing.Especially for the high-power multi-actuator hydraulic system,the load difference of the multi-actuator causes the pump source and the load to be mismatched,and the throttling and overflow losses are serious,which makes the hydraulic system fall into the dilemma of high energy consumption and low efficiency.With the continuous research on the high-power multi-actuator hydraulic system in reducing throttling loss,eliminating overflow loss and improving the recovery of dynamic and potential energy,the energy saving effect of the hydraulic system is significantly improved in the local working conditions,and the problem of throttling,overflow and dynamic or potential energy recovery in the full working condition period cannot be comprehensively solved.Based on the advantages of multiple energy-saving modes in hydraulic multi-source network system,this paper proposes an energy-mode switching idea based on model prediction,aiming at constructing a global energy management strategy for hydraulic multi-source network systems,giving full play to the energy-saving advantages of each model so as to improve energy utilization and reduce the energy from the prime mover.The research content to be carried out in this paper is as followings:(1)According to the matching requirements between multi-level pressure source and load,this study establish a switching energy loss mechanism model,study the switching energy loss characteristics,obtain the switching minimum energy optimization control method.Combined with the real-load condition of a hydraulic excavator,a multi-stage pressure source optimization method for time-series loads is designed.(2)The basic energy unit is defined according to the functional carrier of the energy transfer of the hydraulic system.The basic energy unit function division method is adopted to extract the energy unit characteristic state.And the unit energy dissipation quantitative prediction mathematical model is established.It lays a theoretical foundation for the system's global energy analysis and energy management strategy.(3)The energy mode configuration scheme is studied,and establish the mathematical model of the hybrid switching system by the hybrid system control idea.By comprehensively considering the energy utilization rate,response speed,control precision,obtain the dynamics logic threshold of each energy mode operation and the matching mechanism between each mode and load.Based on the energy transfer path of different modes,energy pattern matching and evaluation models based on model prediction are established.The switching rules and the objective function are designed,and obtain the energy mode switching supervisory controller.(4)Based on the experimental platform of hydraulic multi-source network system,the simulation experiment is performed in the actual multi-actuator load conditions.The energy utilization effect of the non-management strategy is compared to verify the feasibility and effectiveness of the proposed energy deployment mechanism and management strategy under the same working conditions.These provide references for the engineering application and energy-saving design and transformation of high-power multi-actuator hydraulic systems.