Experiment And Parameter Optimization Of Regenerative Braking System For Hydraulic

Hydraulic hybrid power system gradually draws the industry's attention,which is high power density,low cost,and high efficiency of braking energy recovery.The parameters matching of hydraulic regenerative braking system has a great influence on the braking energy recovery efficiency.Therefore,it is of great value to carry out the research on the parameter matching of hydraulic regenerative braking system.In view of the influence of hydraulic regenerative braking system parameters on the braking energy recovery efficiency,this paper does some work as fllows:(1)Analyzing the characteristics of different hydraulic systems,and determing the parallel hydraulic hybrid power system.(2)Principle experiment and simulation : Establishing a mathematical model of regenerative braking system of parallel hydraulic.Establishing simulation model to adapt with the mathematical model of the system in MATLAB.In view of the braking energy recovery efficiency,a study on accumulator pressure,initial storage of volume,the highest pressure was made.Then,the experimental bench,adaptting to the simulation model,was established and the corresponding experimental was done.The simulation results and the experimental results are consistent.The study shows that the pump / motor displacement,accumulator initial pressure and rotational speed of flywheel has a great influence on the braking energy recovery efficiency.In order to improve the energy recovery efficiency,the orthogonal experiment was used to do the optimization design of multi factor experiment,and the optimal parameter group was get.The optimal parameters experiment results show that using the optimized Parameter group,the energy recovery efficiency was improved.(3)Using the Adams and MATLAB tools to establish the parallel hydraulic hybrid system,which was to simulate the 2.2 tons hydraulic hybrid sedan model.Evaluating the combined effects of parallel hydraulic hybrid power system parameters on the energy recovery efficiency and braking safety.The results show that,as the initial pressure of accumulator and accumulator volume changing,when the impact energy recovery efficiency increases,the braking safety becomes worse.when the energy recovery efficiency is reduced,the braking safety increases.In other word,The influence of the initial pressure of accumulator and accumulator volume on the safety and effect of braking efficiency is not consistent.As the maximum pressure of system changing,when the efficiency of energy recovery increases,the braking safety increases.when the energy recovery efficiency is reduced,the braking safety is getting worse.That is the influence of the highest pressure system on the safety and effect of braking efficiency is consistent.(4)In order to ensure the braking safety and achieve optimal energy recovery efficiency.In this paper,the orthogonal experiment method was used to do the optimization design of multi-objective multi factors,and the optimal parameter group was get.The optimal parameters experiment results show that using the optimized Parameter group,both the energy recovery efficiency and the braking safety were improved.In this paper,the multi objective and multi factor orthogonal test method is used to optimize the parameters of the hydraulic regenerative braking system.The optimal parameters experiment results show that using the optimized Parameter group,both the energy recovery efficiency and the braking safety were improved.