| As the pollution of the environment becomes more and more serious,energy saving and emission reduction become the primary task of achieving the sustainable development of the automobile industry.A piezoelectric energy fed suspension system,which is mainly composed of shock absorber,piezoelectric mechanism,energy recovery circuit and energy storage system,is based on piezoelectric effect and put forward by the research group.This article is based on the previous research about piezoelectric mechanism and shock absorber by research projects’ group.And simulation and experimental study are done on the power generation performance of multiple piezoelectric vibrators and hybrid energy storage system.Firstly,on the basis of previous research on the energy recovery circuit of single piezoelectric vibrator,an equivalent electrical model of multiple piezoelectric vibrators is established by using the related knowledge of piezoelectricity and interface circuits.The piezoelectric vibrator output circuit composed of piezoelectric device and energy recovery circuit is used to do experiment and simulation analysis of the connection and output characteristics of the multiple piezoelectric vibrators,which provides input parameters for subsequent energy storage circuit design.Secondly,according to the output power characteristics of the multiple piezoelectric oscillators output circuit,the DC-DC voltage conversion circuit is designed,and the voltage of the converted electric energy is controlled within the range of 12 V to 16 V.The circuit is designed by using electronic components,such as electronic chips,resistance inductors,and single chip,simulation and analysis of circuit is done by Multisim software.The DC-DC voltage conversion circuit is improved on the basis of the simulated voltage conversion results,until the output voltage is stable in the target range.Set up the experimental platform and carry out the welding and experiment of the related circuit.The correctness of simulation and circuit design is verified by the experiments.The output characteristics of the DC-DC voltage conversion circuit are compared before and after the improvement,and the direction of further improvement is put forward.Thirdly,selection of storage electric energy collecting and storing device is done,the switching circuit for the passive and active hybrid energy storage is designed.Simulation and analysis of its control strategy is done by Multisim software.Experimental research on the switching mode of mixed energy storage system is done by experimental bench.Comparing and analyzing the simulation and experimental results,the advantages and disadvantages of switching modes of each switching circuit are analyzed,and the related parameters are optimized.Finally,the energy storage efficiency of stored energy in super capacitor and storage battery after DC-DC voltage conversion circuit and hybrid energy storage switching circuit is experimentally studied.By changing the motor speed,the energy stored in the storage system at different speeds is measured,the average energy storage efficiency of the energy storage system is calculated,and the factors affecting the energy storage efficiency are analyzed. |
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