Design And Experimental Study On Energy-regenerative Circuit Of Hybrid Energy-regenerative Suspension System

Active suspension can improve dynamic performance of vehicle effectively,however,the energy consumption is huge,which contrary to the idea of "energy saving and emission reduction" of vehicle industry development.Semi-active suspension can improve the dynamic performance of vehicle while consuming a small amount of energy,which makes it worthy of being studied.In this paper,a kind of hybrid energy-regenerative suspension system was designed.Through designing energy-regenerative circuit of it and the corresponding semi-active control strategy,the purpose of ‘effective coordination of vehicle dynamics performance and suspension energy-regenerative performance' was reached.The detailed work of this paper are as following:Firstly,the structure and overall scheme of the hybrid energy-regenerative suspension system were described in detail.On this basis,the full vehicle seven degree of freedom dynamics model was built.Then the linear motor performance test was conducted,the relation and system parameters of electromechanical conversion of hybrid energy-regenerative suspension system were obtained,and the coil resistance of linear motor was also gotten by calculating.Secondly,the energy-regenerative circuit of hybrid energy-regenerative suspension system was designed,including "from linear motor to super capacitor" energy-regenerative circuit,"from super capacitor to battery" energy-storage circuit and double capacitor charging and discharging switching circuit.When designing the "from linear motor to super capacitor" energy-regenerative circuit,the current of different working modes was analyzed,and the selection of some electrical components in the energy-regenerative circuit was also analyzed.When designing the "from super capacitor to battery" energy-storage circuit,the“ Four Battery ” energy-storage scheme was proposed,and its working principle was expounded.Thirdly,hybrid(skyhook and groundhook)semi-active control strategy was designed,and the control principle and the selection process of the most suitable control parameters were described in detail.On this basis,current tracking control test was carried out by usingdSPACE.The test results showed that the designed semi-active control strategy had a good tracking effect on the current of the energy-regenerative circuit.Fourthly,simulation was carried out,and the dynamic and energy-regenerative performance of full vehicle hybrid energy-regenerative suspension system were researched by comparing with traditional passive suspension.The simulation results showed that hybrid energy-regenerative suspension could improve the dynamic performances of vehicle while recovering some vibration energy,the purpose of ‘effective coordination of vehicle dynamics performance and suspension energy-regenerative performance' was reached.Lastly,the performance test of full vehicle hybrid energy-regenerative suspension was carried out by using dSPACE,dSPACE may output control signal to control the switch state of the Mosfet in the external energy-regenerative circuit,through which realized the coordinated control of vehicle dynamics performance and suspension energy-regenerative performance.The test results were consistent with the simulation results,which verified the reliability of the simulation results.The researches showed that by systematically designing of energy-regenerative circuit of hybrid energy-regenerative suspension,temporarily storing energy in the super-capacitor firstly,then transferring the energy to battery,the energy can be stored stably.By designing the semi-active control strategy,hybrid energy-regenerative suspension can improve the vehicle dynamic performance while recovering the vehicle vibration energy.