Study Of Active Suspension Robust Control Based On AMESim

With the continuous improvement of living standards the car more and more in-volved in people’s life, it has become a necessity for people’s work and life. The require-ment to the performance of the car is improved continuously. People require that thecar has not only good dynamic performance, but also good ride comfort performance.Good handling stability, comfortable riding environment, low vibration and low noisehave become the important symbols of the modern automobile. In recent years, automo-tive technology has made great progress, and the automobile industry developed rapidly.Computer simulation technology is applied to the vehicle research and development（R&D） process on a large scale, and a range of electronic control technologies are used in thecar, such as ABS, ESP and active suspension, etc. Using these new technologies not onlyreduced the vehicle R&D expense and vehicle cost, but also improved the performanceof the vehicle dramatically.By computer simulation, this paper show that how to use active suspension to ensurethe vehicle handling stability, and to improve the vehicle ride comfort. Taking into accountthe needs of the simulation, we first made a15-degree of freedom vehicle dynamics modelin AMESim software environment, and this model can be used as plant in the studyof various types of vehicle active control algorithm, which is formed by the many sub-modules, such as the chassis, suspension, tires and seat. In order to guarantee the accuracyof the vehicle model, this paper uses the real car data of Hongqi HQ3as parameters ofthe model. At the same time, the model is validated by the real vehicle experiment dataof the HQ3. The model verification results show that the accuracy of the vehicle modelis very high, fully meet the requirements of the general vehicle dynamics simulation.For some shortcomings of various control methods in the study of active suspension,this paper selected a H₂output feedback control method based on generalized H₂con-straint. The control method guarantees the system constraint by generalized H₂norm,and evaluates the system performance by H₂norm. Meanwhile, in order to solve thecontroller through the computer programming, we have given a solving process based on the linear matrix inequality.Finally, this paper designed an active suspension controller based on a four degreesof freedom half vehicle model according to given solving method, and analysed its robuststability and robust performance. Through three sets of simulation experiments, we verifythe control efect of the active suspension for15degrees of freedom vehicle dynamicsmodel in the AMESim. From the simulation curve, we can see that the active suspensioncan greatly improve the vehicle ride comfort, at the same time it can ensure the vehiclehandling stability, so it has a high practical value.