| The traditional passive suspension is difficult to meet the needs of all kinds of road conditions and drivers because its spring stiffness and damping is fixed value.The development of electromagnetic suspension made up the deficiency of traditional passive suspension.The performance of electromagnetic active suspension is superior,but its energy consumption is huge,so its application is limited.The electromagnetic semi-active suspension has less energy consumption,but the control effect is not as good as the electromagnetic active suspension.Moreover,the motor structure comprised in the electromagnetic suspension reduces the reliability of the suspension system,so that it does not have the Fail-safe characteristics.In this paper,an electromagnetic hybrid suspension system with high reliability is proposed and designed to improve the dynamic performance,reduce the energy consumption.The main research contents are as follows:Firstly,the concept of electromagnetic hybrid suspension is put forward from two aspects of structure and control method.In the structure,the spring,the linear motor and the passive adjustable damper are connected in parallel to improve the reliability of the system.In the control method,the electromagnetic hybrid suspension combines the advantages of active control and semi-active control and forms hybrid control what has the characteristics of superior control effect and low energy consumption.Meanwhile,multi modes are designed for the electromagnetic hybrid suspension,include: comfort mode,sport mode,comprehensive mode and regeneration mode,it aims to consider the dynamic performance and energy consumption/regeneration characteristic.Then,the parameters of the electromagnetic hybrid suspension system are designed,including: the LQG weighting coefficient,the spring stiffness and the four damping coefficient of the passive adjustable damper.The simulation comparison of the dynamic performance and energy consumption/regeneration characteristic of electromagnetic hybrid suspension,electromagnetic active suspension and traditional passive suspension is carried out to verify the feasibility of the electromagnetic hybrid suspension system and the rationality of the parameter designed.Finally,the damping characteristic test of linear motor and the 1/4 electromagnetic hybrid suspension bench test based on dSPACE rapid control prototype were carried out.The consistency of damping characteristics of linear motor in test and simulation was verified.The experimental study on the dynamic performance and the energy regeneration characteristics of the electromagnetic hybrid suspension is carried out.The experimental results were in good agreement with the simulation results,which verifies the validity of the system structure and the correctness of the control method.Studies have shown that,in comfort,sport and comprehensive mode,the electromagnetic hybrid suspension can improve the dynamic performance and greatly reduced energy consumption compared with the electromagnetic active suspension.In regeneration mode,the dynamic performance is not much different compared with the traditional passive suspension but the energy regeneration can be achieved. |
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