Energy Consumption Characteristics And Energy Saving Control Of Parallel Digital Valve And System

Digital hydraulic technology has the advantages of high freedom of control,high efficiency and energy saving,and strong anti-pollution ability.It conforms to the national strategy for the green,energy saving and intelligent development of high-end equipment,and is the current research hotspot of modern hydraulic transmission.Digital valve is the core control component in the field of digital hydraulic,using multiple digital valves in parallel to break the coupling relationship of the traditional valve spool,not only high control freedom,with flexible coding and control mode,but also has great energy saving potential.However,the energy consumption mechanism of parallel digital valve under different control modes is not clear.Therefore,this paper took the parallel digital valve and its system as the research object,studied the energy consumption characteristics and energy saving control of the parallel digital valve and its system,in order to improve the energy efficiency of the digital hydraulic system.The main research contents of this paper are as follows:(1)Energy consumption modeling and characteristic analysis of digital valve.The structure and working principle of digital valve are analyzed,and the mathematical model of digital valve is established.The energy consumption mechanism of digital valve under different working conditions is studied,the energy consumption model of digital valve under different control signals is established,and a simulation model is built to analyze its energy consumption characteristics.And the dynamic and static characteristics and energy consumption characteristics of digital valve are verified through experiment.(2)Energy consumption modeling and characteristic analysis of parallel digital valves.Based on the energy consumption model of the digital valve,the energy consumption model of the parallel digital valves under different control modes was established.Through simulation analysis,the relationship between the energy consumption of the parallel digital valves and the switching times of the switch under different switching states is obtained.The low energy consumption state switching principle of the parallel digital valves is proposed,which provides the research basis for the energy-saving control of the parallel digital valves-controlled cylinder system in the next step.(3)The strategy of independent metering control and energy recovery energy-saving control are proposed based on parallel digital valves.The mathematical model and energy consumption model of the parallel digital valves-controlled cylinder system are established,and the cost function aiming at the minimum switching times is proposed to reduce the energy consumption loss of the parallel digital valve.The position-pressure load port independent control strategy and energy recovery energy-saving control strategy are designed according to the two working conditions of impedance stretching and overstepping retracting,and the simulation model is built.The system control characteristics and energy consumption characteristics under the two control strategies are analyzed to verify their feasibility.(4)Energy saving control of parallel digital valves-controlled cylinder system is verified by experiment.The parallel digital valves-controlled cylinder system test platform is built,and the energy-saving control strategy of load port independent control and energy recovery based on parallel digital valve is verified by tests under given working conditions,and the energy-saving effect of the two energy-saving control strategies is compared and analyzed.Simulation and experiments show that the energy-saving control strategy of parallel digital valve can realize the energy-saving control of the system and improve the energy utilization rate of parallel digital valve.