The Integrated Optimization Research Of Parallel Hydraulic Hybrid Hydraulic System

The problem of energy crisis and environmental pollution is becoming moreand more serious,urgently to be solved,combined with the fundamental energyconsumption of new energy vehicles is traditional non-renewable energy,Just changeanother form (such as change coal into electricity),Hydraulic hybrid technology hasmore advantage than traditional vehicles and new energy vehicles,the formerimprove the energy efficiency and vehicle dynamic performance for reusing wasteenergy,reduce the emissions,reduce the installed power of engine,adjust the engineworking point,increase the working life of the brake system,and there is nosecondary pollution.Xinhui Liu team of Jilin university has researched on hydraulichybrid system for many years and made many achievements,Has risen to practicalapplication stage,At present,the technology has gained good effect in the test bench,test prototype and enterprise project and been recognized by peers and industries,Inthis paper,we will take popularization and application of parallel hydraulic hybridvehicle as the goal,So the integrated optimization of hydraulic system is the researchcontent.On the basis of related literature at home and abroad reported,From the aspectsof energy,environment and integrated promotion,the paper expounds the significanceof integrated optimization of hydraulic hybrid hydraulic system,introduces theconcept of hydraulic hybrid technology and integrated optimization and theirresearch status at home and abroad,analyzes vehicle driving resistance and keyelements in the field of theory,And establishes the mathematical model.Keycomponents include secondary components, accumulator, torque coupler, flywheeland piping.Systematically introduces hybrid test bench,including: transmission system,hydraulic system and control system.And does a series of experimental research, summarizes the shortcomings, puts forward improvement scheme.In the AMESim environment,comprehensively sets up hydraulic simulationmodel of the improvement scheme,builds element level simulation model of thecartridge valve,establishes system-level simulation model of other hydrauliccomponents,set parameters according to the theoretical calculation and engineeringpractice experience,Gets the flow rate, pressure curve and static and dynamiccharacteristic curve, analyzes system feasibility.Uses3D software Pro/E to design integrated valve block based on the theory oftree model,improves the feasibility of installation,it is convenient for debugging andinstallation,reduces the redundant part,system is very concise,uses the minimumvolume reduction method to reduce the valve block size on the premise of meetminimum wall thickness and pipe sizes requirements.Finally, in the3Dmodel,fully refines typical flow form,the optimization goal isevery flow pressure loss is minimum,uses FLUENT software as aplatform,calculates the pressure loss,finds root pressure loss and flow law of fluidflow,specifics reference standard for the optimization of valve block.This paper combines the advantages of AMESim and FLUENT,combinesmacro and micro,hybrid simulation manifests the complementary advantages.Bothuses the advantages of AMESim software can be used to analyze dynamicmacroscopic and uses the advantages of micro flow field analysis of FLUENTsoftware as flow field computing platform to calculate the internal flow fieldpressure loss.