Research On Load Matching And Energy Saving Of Sugarcane Combine Harvester Based On PVG Proportional Valve

As a high-power,multi-pump and multi-actuator system,the energy-saving and of sugarcane combine harvester will become one of the core competitiveness in the future.Based on the output characteristics of PVG(Proportional Valve Group)electro-hydraulic proportional valve group,combined with the working load characteristics of each sub-system under four working conditions of sugarcane combine harvester,this paper conducts simulation analysis with AMESim,compares with the traditional hydraulic throttling speed regulation system and studies the operating characteristics and energy-saving mechanism of sugarcane combine harvester.This research provides reference for the optimal design of the hydraulic system of sugarcane combine harvester.The main contents and conclusions of this paper are as follows:(1)Test the working load of key components of the sugarcane combine harvester under four typical working conditions,Construct the load spectrum of four working conditions by rain flow counting method,The data analysis results show that: The distribution range of the load of each component under the lodging working condition is 2 to 4 times larger than non-lodging working condition;The distribution range of the load of wheel and base cutter under slope working condition is 1.5 to 2 times larger than flat working condition.The conclusions prove the necessity of the application of load-sensitive systems,and also provide data support for the simulation of subsequent chapters.(2)The type and operation characteristics of PVG32 single-way pre-valve compensation are analyzed.Two simulation models,PVG32-A open system and PVG32-C closed system,are established,then imported the load spectrum and compared with the general throttle speed control system(hereinafter referred to as GTSC system)in speed stability and energy saving.The results showed that,PVG32-A or PVG32-C system is better than GTSC system in rotational speed stability;in terms of energy saving,average power: PVG32-C system < PVG32-A system < GTSC system.(3)Analyzed the characteristics and principle of PVG32 multi-way pre-valve compensation.The simulation model of a single pump multi-actuator(base cutter,chopper and fan)hydraulic system(hereinafter referred to as PVG32-M system)based on open center PVG32 multi-way pre-valve compensation is established,the load spectrum of each subsystem is imported,and multiple general throttle speed control system(hereinafter referred to as GTSC-M system)are analyzed in the simulation.The research shows that under the four working conditions,the PVG32-M system can reflect the advantages of energy saving,and each subsystem has good speed stability and can maintain speed ratio relationship within set range.However,under the sufficient flow condition,the speed ratio relationship between subsystems cannot be maintained,which will increase the probability of stoppage and impact on sugarcane combine harvest quality.(4)The characteristics and principle of PVG100 multi-way post-valve compensation system are analyzed.The simulation model of a single pump multiactuator(base cutter,chopper and fan)hydraulic system(hereinafter referred to as PVG100-M system)based on open center PVG100 multi-way post-valve compensation is established,compared with PVG32-M system and GTSC-M system in energy saving.The results shows that PVG100-M system has the best energy saving and anti-sufficient flow condition under the same working condition,which can ensure the coordination of each subsystem and effectively prevent logistics congestion.(5)The simulation model of closed-center type system(hereinafter referred to as PVG-MC)composed of variable pump and PVG multi-way valve pre-valve compensation and post-valve compensation is established,in order to achieve the pump,base cutter,chopper and fan subsystems cooperative system dynamic matching of flow,pressure with load.Compared with GTSC-M system and open center load-sensitive multi-way valves system in energy saving,the result shows that,under the same condition,PVG-MC system of energy saving is better than the others.