Research On Energy Recovery Of Vehicle Semi-active Suspension With Parallel Ball Screw

People's demand for vehicle comfort and handling stability is getting higher,the main function of vehicle suspension is to effectively filter and absorb the impact and vibration caused by uneven road surface,and to transfer the force and moment between wheel and body,which has great influence on the ride comfort and operation stability of the vehicle.The stiffness and damping of the traditional passive suspension are fixed values,the vehicle can not be in the ideal state under different working conditions and road conditions,and the vibration energy of the passive suspension is mainly converted to heat dissipation.In this paper,a new type of parallel ball screw semi active suspension can not only adjust the suspension damping according to different road conditions,but also improve the ride comfort and operation stability of the vehicle,as well as vibration energy recovery and energy management.The parallel type ball screw semi active suspension and its energy management system are used to improve the feed efficiency.And the ability of torque amplification for semi-active vibration reduction by using variable speed reversing gear box mechanism.Based on the research of the structure and principle of the semi-active suspension of the parallel ball screw,the structure parameter analysis is carried out,the selection and design of the main components of the suspension are completed,the mathematical model of the actuator is established,and the energy-supply characteristic,the damping force characteristic and the semi-active characteristic simulation analysis are carried out To carry out the design of the energy management system of the parallel ball screw semi active suspension,using the method of open circuit voltage and AH integral to estimate the SOC,using Man correction and OCV correction to eliminate the cumulative error of SOC estimation,and to ensure the accuracy of SOC estimation,Based on the dynamic deflection simulation analysis and SOC detection of suspension,the energy management strategy of suspension is designed,the trial-manufacture of the hardware circuit of the energy management system is carried out,the prototype of the parallel ball screw semi active suspension actuator is made,and the related bench test is carried out by using the existing vibration test rig.The simulation and test results show that the energy-recovery capability of the suspension is validated by the 4?9V power-supply voltage of the actuator in the 1?2Hz sinusoidal vibration frequency and the 5?10mm vibration amplitude.When adopting the Sky-hook control method,it can effectively reduce the suspension dynamic deflection,the tyre dynamic load and the body acceleration.Therefore,the proposed parallel ball screw semi active suspension not only has the semi-active damping ability,but also can carry on the vibration energy recovery,the energy management system can carry on the mode switching according to the road condition and the energy storage system,and can carry on the efficient energy recovery.