The Design And Experimental Study Of Multi-mode Switching Control System For Hybrid Suspension

The active suspension system is controlled by the actuator.Comparing with the passive or semi-active suspension,the dynamic performance can be improved by active suspension.Traditional control method of active suspension is hard to obtain good dynamic performance and save its energy together.To solve these problems,this paper proposes the hybrid suspension composed of linear motor and adjustable damper,and builds its multi-mode switching control system.First of all,control strategies in different modes are changed through the use of multi-mode switching to improve the control effect.Then in order to reduce energy consumption and recover energy,the appropriate damping values in different modes are selected and the linear motor is used as a generator.According to the above,the main contents of this paper are the construction of the model of multi-mode switching control system,The main research contents are as follows:Firstly,the multi-mode switching system is designed and constructed for hybrid suspension.Based on different control targets,four operation modes are identified: comfort model,security model,combine performance model and passive energy recycle model.Then appropriate switching parameters are selected and the model of multi-mode switching system is built by Simulink/Stateflow to verify the effectiveness of this system and the rationality of its switching parameter threshold.Secondly,local and global controllers are designed.According to the control requirements of different working modes,control strategies of sky-hook,ground-hook and a hybrid of sky-hook and ground-hook are imported to design local controller.Thirdly,through comparing with traditional passive suspension,this paper analyzes the control effect of local controller in four modes of hybrid suspension,dynamic performance and energy consumption characteristics of global controller.Finally,the simulation results shows its effectiveness and rationality.Finally,the bench testing is conduced to verify the above methods.In this paper,experimental study on dynamic performance and energy feedback capability of hybrid suspension is based on dSPACE V development model.The results of simulation match well with those of the bench testing and it verifies the effectiveness of the switching system.