Research Of The ABS Control Strategy For Full-Vehicle Based On ADAMS

ADAMS is the software of Automatic Dynamic Analysis Mechanical System applied widely at home and abroad. In this paper the virtual prototype model with 14 DOFs was built with the help of ADAMS platform. This model can evaluate accurately some dynamic performances of vehicle in design stage, such as full-vehicle handling stability. It can save time, reduce cost and improve the quality of automatic development with the application of virtual prototype technology.The main work of this paper can be summarized as the following. Firstly, the virtual prototype model with 14 DOFs was built with the application of ADAMS platform. The brake system model and its control algorithm were developed by using the software MATLAB/Simulink. The co-simulation was performed with the conjunction of the above models and the ABS performance was investigated.The research of ABS is mainly focused on the control strategy based on single wheel model. However, the control algorithm only emphasizes the car's braking distance and wheel lock. Moreover, its ability is too simplified to track the variance of road state in this model. When the ABS based on single wheel control technology is applied to braking on the split road, the lateral deflection would appear because of the different road adhesion coefficients, even the car could get out of the lane. At present, although the control strategy can handle the effect of the car's brake efficiency caused by different roads, the emphasis on braking direction stability during braking and running deflection are few considered. In order to improve direction stability, this paper presents a new control strategy which could identify road adhesion coefficients according to the braking pressure and then adjust the brake torque of tires. With the 14 DOFs virtual prototype vehicle model, the simulation based on ADAMS/SIMULINK software is conducted to analyze the braking efficiency and the direction stability on the roads with different adhesion coefficients. It is shown from the results that the approach could not only reduce brake time and distance but also improve braking direction stability and it can provide information for the further development on the active control strategies of vehicles.Finally, a summary is given to the current research work. Although the co-simulation model is developed and can carry on some vehicle virtual experiments, the system is needed for the further development when it is applied into practice and there are much works left to the further research. Although the co-simulation based on virtual prototype was an emerging and challenging technology, the application of co-simulation in vehicle virtual experiments is very wide and innovative from the viewpoint of current research work.