Research On Hydraulic Hybrid Power Simulated Test-bed Based On Dynamometer Loading

Hybrid power technology can effectively alleviate the current energy and environmental problems caused by internal combustion engine vehicles.Hydraulic hybrid power system has higher power density than oil-electric hybrid power system.It can convert a large amount of energy in a relatively short time,and the effect of regenerative braking energy is better.In the process of automobile technology development,simulation test-bed plays a very important role.Through simulation test-bed,different components and subsystems can be flexibly tested,which has important reference significance.In this paper,the four main structural forms of hydraulic hybrid power system are analyzed.By comparing the advantages and disadvantages of different structures,the parallel structure is chosen as the main research direction of this paper.The function of the test-bed is divided,each functional part is analyzed in detail,and some key components of the system(flywheel,torque coupler,hydraulic pump/motor and hydraulic energy storage)are also analyzed.Design calculation.The dynamic model of vehicle passing is analyzed and the road load is simulated.In order to make the simulation test-bed close to the real vehicle to the greatest extent,the stress state of the test-bed is analyzed and the load moment required by the dynamometer is calculated.Through the above analysis,the overall structure of the parallel hydraulic hybrid power simulation test-bed is established,and the working principle of the test-bed is analyzed.The energy-saving principle of parallel hydraulic hybrid power system is analyzed.According to the characteristics of the simulation test-bed,several basic working conditions are introduced,including hydraulic system driving alone,vehicle charging,auxiliary driving and auxiliary braking.The corresponding control strategies are established for these conditions.According to the established mathematical model and the parameters of the existing bench,the back simulation model of the hydraulic hybrid power simulation test-bed is established in AMESim software,and tested in Japan 10-15 and FTP72 respectively.The working state of the hydraulic hybrid power system is analyzed through the changes of hydraulic accumulator pressure and hydraulic pump/motor torque during the simulation process,so as to analyze the hydraulic hybrid power system.Performance of power system.Through the simulation of AMESim simulation model,the fuel consumption results of hybrid power system and non-hybrid power system are compared,and the rationality of the control strategy is verified.The realization of torque control shows the feasibility of parallel digital hydraulic pump/motor.Finally,the simulation test bench is built and perfected,and the charging and discharging experiments of the hybrid power system are carried out according to its operating conditions.The experiment proves that the hydraulic hybrid power simulation test bench can effectively achieve energy recovery and achieve energy saving effect.