Development Of Closed-loop Driving Simulator In Complex Environment And Research On Handling Characteristics

In recent years, the automobile industry of china has developed rapidly. As the production of automobile increased continually, china has become the biggest automobile manufacturing country of the world. Since there are more and more cars running on the road, the security of vehicles have been concerned more than before. The security of vehicles is closely related to the handling and stability of vehicles, whose traditional research methods need to use a lot of sensors, test equipments and data acquisition devices .In order to obtain research datum and information which we need, we have to make a large number of real vehicle experiments. What's more, these methods of traditional research undoubtedly will lead to the extension of the development cycle, reduction of the efficiency, increase of the cost and many other negative results. Meanwhile, the real vehicle experiments under extreme conditions have great risks. However, it will help us overcome these disadvantages and bring us great benefits if we adopt the human-vehicle-road closed-loop driving simulation system, which conforms to the actual requirements, instead of real vehicle experiments for driving state of vehicle simulation.Aimed at the high cost of large development driving simulator and the inability of performance of vehicle operating state for teaching driving simulator , this article which based on a desktop virtual reality technology illustrates a low-cost human - vehicle - road closed-loop driving simulator whose vehicle running state data can be recorded. The followings are the mainly work that have been done. Firstly, a nine-degree-freedom vehicle dynamic model program was made by using the knowledge of vehicle handling dynamics. Secondly, three-dimensional modeling software was adopted to build the three-dimensional model of vehicle; lighting model, texture mapping and other technologies helped to realize the expressions of the virtual car model. Thirdly, the fractal theory and the DEM model were applied to build the road and surrounding environment of the three-dimensional model. Fourthly, the utilizations of priority rendering, external references and other scenes display optimization technology solved the problem of fluency about the scenario model shows. Fifthly, the driving simulation system was applied for vehicle dynamics simulation. The theoretical analysis and driving simulation from two aspects of the vehicle state on the left turning and road surface friction coefficient impaction were made. Through the analysis of the simulation results, it indicated that the closed-loop system was able to provide the data for handling dynamics analysis of vehicles, and supply a platform for virtual simulation of the research on the characteristics of human-vehicle-road closed-loop system.