Valve Characteristics Analysis And Vehicle Application Of Hydraulic-Electromagnetic Energy-Harvested Shock Absorber

Hydraulic-electromagnetic energy-harvested shock absorber is one kind of improved components in semi-active suspension.Through the adjustment of load resistance in generator,the damping ratio of new shock absorber can be smoothly changed,which is more in line with actual vehicle performance requirements.When travelling on the rough road within the regenerative system,mechanical vibration energy in tires can be converted in to electricity by means of hydraulic motor and generator,which realizes energy self-sufficiency and greatly promotes application feasibility on current vehicle.Therefore,whether to conventional fuel vehicle,or to new energy vehicle,hydraulic-electromagnetic energy-harvested scheme has wide adaptation potential.Firstly,combined with working principle of hydraulic-electromagnetic energy-harvested shock absorber,the damping force mathematical equations were derived in detail based on pressure-flow characteristics of hydraulic elements and torque-speed characteristic of generator.Through the power flow analysis of new shock absorber,it can be concluded that peak regenerative power increases with the improvement of incentive rate,while mean regenerative efficiency has negative relationship with incentive rate.Secondly,based on kinetic equations of cartridge check valve and characteristic data of actual product,its dynamic simulation model was established and verified on AMESim software.Through comparative analysis between simulation results of original energy-harvested scheme and bench testing results of hydraulic rectifier damper prototype,it can be concluded that the dynamic performance of cartridge check valve cause bounce phenomenon to the damping force of new shock absorber during the initial stage in rebound stroke and the debug method to mitigate this phenomenon is also proposed.Thirdly,according to the finite element analysis results of hollow diaphragm spring on ABAQUS software,the improvement scheme simulation model of hydraulic-electromagnetic energy-harvested shock absorber was established on Simulink software.Through the impact analysis of damping characteristics and regenerative characteristic by adjusting structural parameters of diaphragm check valve and other system units,the external characteristic matching design procedure of new shock absorber to different target vehicle was discussed.Based on restructuring design of conventional hydraulic damper,the improvement scheme physical prototypes of new shock absorber were manufactured.Physical prototype bench testing results demonstrate the practicability of oil flow channel design in hydraulic cylinder.Lastly,based on random road excitation model and new shock absorber simulation model on Simulink software and vehicle model on CarSim software,vehicle dynamics co-simulation model within equivalent conventional damper and hydraulic-electromagnetic energy-harvested scheme was established.Through those comparative testing results of random road and double lane change between target vehicle and traditional vehicle,it can be concluded that ride comfort of target vehicle within new regenerative shock absorber is better than that of traditional vehicle and handling performance evaluation indexes are very close.According to front left shock absorber displacement data of a commercial vehicle driving on A class and B class random road in Xiangyang Automobile Testing Ground,the movement rule of conventional hydraulic damper was statistically analyzed.