On The Key Techniques Of Hardware-in-Loop Simulation Platform For Semi-Active Suspension System

The suspension system plays a decisive role in the comfort of the car and the stability of manipulation.Compared with the passive suspension,the damping of the semi-active suspension is adjus Table,and can be adjusted in real time to different road conditions.Compared with the active suspension,the structure is simple and the cost is lower,which can achieve the control effect close to the active suspension;therefore,it has become a hot research topic.Hardware-in-the-loop simulation is a kind of semi-physical simulation,which has a more practical result closer to the actual conditions compared with pure software simulation.Compared with the actual vehicle tests,the test conditions are controllable,the repeatability is high,the cycle is short,and the cost is low,and can avoid high-risk extreme working conditions test.At present,we still have a long way to go to realize the rapid development of semi-active suspension products and the completion of semi-active suspension control algorithm verification as well as related system performance testing.In order to solve these problems,combined with the development of semi-active suspension system,this paper puts forward a research method of building a semi-active suspension hardware-in-the-loop simulation platform.The main research contents include:1)First,the overall design and the mechanical structure design of the semi-active suspension hardware-in-the-loop simulation test-bed were made;Then checking its stifness as well as mode of the mechanical structure and made in kind.The type of the device has been selected;using a dynamometer to test the characteristics of the magnetorheological shock absorber used in the test,it is verified that the damping force increased with the increase of current,which met the test requirements.2)The Carsim/Simulink co-simulation platform is built,and the setting methods of the car model,pavement model,simulation conditions of the Carsim platform,and key technologies such as data transfer in co-simulation are studied;according to the simulation requirements,the method of generating random road roughness in the spatial domain by using the random harmonic superposition method is studied,and the three-dimensional model of twisted road,rubbing road and random road surface is implemented in Carsim.3)Aiming at the open-loop and non-linear characteristics of the electromagnetic exciter,a minimum-variance self-tuning controller for real-time closed-loop control is designed,and the algorithm is implemented and performance simulation is carried out on Labview platform.The results show that: the minimum-variance self-tuning controller the tracking ability of the desired signal is relatively good,and can be used for adaptive closed-loop control of the Electromagnetic exciter.4)The performance simulation of three semi-active suspension control algorithms,such as Sky Hook on-off,ADD and SH-ADD,is conducted,and it is concluded that all three control algorithms can effectively improve the relevant performance of the car.