A Regenerative Shock Absorber Considering Twin Ball Screws Transmissions For Application In Range-extended Electric Vehicles

With the depletion of petroleum resources and the increase in greenhouse effect,methods of conserving resources and reducing carbon dioxide emissions are attracting great attention.Electric vehicles have received great attention due to their low energy consumption and low pollution.However,due to limitations in battery technology,electric vehicles are often not ideal for cruising range,which has become a bottleneck for electric vehicle.The traditional shock absorber converts the energy of the suspension vibration into heat energy during the running of the vehicle,which causes waste of energy.This paper proposes a regenerative shock absorber that converts the suspension vibration energy into electrical energy,applying to the new energy vehicle battery and the sensor,and indirectly improves the cruising range of the new energy vehicle.The main research work of this paper is as follows:Firstly,the structural design scheme of the regenerative shock absorber is introduced.After collecting and collating the literature,the regenerative shock absorber are divided into three categories: linear electromagnetic regenerative shock absorber,bidirectional rotary regenerative shock absorber and unidirectional rotary regenerative shock absorber.Summarizing the advantages and disadvantages of each shock absorber,a unidirectional rotary regenerative shock absorber using a pair of different characteristics of ball screw,gear and one-way clutch is proposed.Adopting the modular idea to divide the shock absorber into three parts: the vibration input portion,the vibration conversion portion,the power generation portion,and the energy storage portion.Secondly,the model and kinematics analysis of the regenerative shock absorber were established,and a dynamic model was established.The Matlab / Simulink software was used to simulate the energy-supply vibration absorber,and the damping coefficient and power of the regenerative shock absorber were analyzed The characteristics and regenerative characteristics indicate that the double ball screw regenerative shock absorber has similar damping as the traditional hydraulic shock absorber.Different excitation inputs and different loads can change the energy-absorbing damping.Finally,according to the model,a prototype of the regenerative shock absorber is made,and the prototype is subjected to MTS bench tests to test the displayed power characteristics and energy-feeding characteristics of the shock absorber under different excitation conditions.The test results show that the double ball screw regenerative shock absorber designed in this paper meets the design requirements,and the characteristics of the regenerative shock absorber are basically consistent with the simulation results calculated from the experimental data.The regenerative shock absorber can recover the vibration energy of the suspension on the premise of meeting the vibration damping effect.The main highlight of this paper is that the regenerative shock absorber achieves similar damping characteristics as the traditional shock absorber through the mechanical structure,which provides a solid foundation for the practical application of regenerative shock absorber.