| In the field of construction machinery,load-sensing technology is widely used because of its simple structure,low cost,and the ability to achieve single-pump multi-actuator compound action.The load-sensitive hydraulic system has the characteristic of being able to compensate the pressure for loads other than the maximum load.There are two main types of load-sensitive pressure compensation systems,pressure compensation hydraulic control system with pressure compensation valve front,and pressure compensation hydraulic control system with pressure compensation valve rear.In this paper,a hybrid pressure compensation hydraulic control system is designed based on the above two pressure compensation techniques.The paper simulates the hybrid pressure compensation hydraulic control system according to the application and characteristics of the hybrid pressure compensation hydraulic control system.The output characteristics of the pressure compensation circuit with pressure compensation valve in front of the system and the output characteristics of the pressure compensation circuit with pressure compensation valve in the back of the system are simulated.The output characteristics of the hybrid pressure compensation system under severe operating conditions are analyzed and an energy-saving system based on the hybrid pressure compensation system is designed.The following research results were achieved.(1)The load-sensitive hybrid pressure compensation hydraulic control system is designed according to the application requirements of the hybrid pressure compensation hydraulic control system,and the dynamics analysis of the hydraulic control system is carried out.The mathematical models of the main components-load-sensitive pumps and multiway valves-were analyzed,and the partial output performance of the main components was obtained through the analysis of the mathematical models.(2)The characteristics of the hybrid pressure compensated hydraulic control system were analyzed.The operation principle of the system is analyzed by the mechanical balance equation of the hydraulic system,with the flow continuity equation,etc.On the basis of establishing the mathematical model of the main components,the output characteristics,performance and structural composition of the designed system are obtained by analyzing the influence of external load on the system changes,and the schematic diagram of the system action process is drawn to pave the way for establishing the subsequent system simulation and analysis model.(3)Firstly,the numerical simulation results of Matlab/Simulink and AMESim are compared to analyze the output performance of the load-sensitive pump and multiway valve,and the correctness of the simulation analysis model of the load-sensitive pump and multiway valve is verified by comparing the simulation analysis results with the actual sample data.Secondly,AMESim software simulation is used to simulate and analyze the characteristics of the working circuit of the system under several different working conditions,and the simulation results show that each actuator can work independently without interference.Finally,the response of the system is simulated under severe operating conditions with multiple loads.The simulation results show that the system has flow priority distribution characteristics and can maintain good resistance to flow saturation under severe operating conditions.The above simulation results show that the hybrid pressure compensated hydraulic control system has strong anti-interference capability.(4)In order to make the hybrid pressure compensated hydraulic control system more energy-efficient,an energy-saving system based on the hybrid pressure compensated hydraulic control system is designed and the energy consumption is analyzed under several operating conditions.The simulation analysis shows that the energy-saving system can effectively recover the energy and the overall design is reasonable. |
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