Research On The Simulation Of Vehicle Braking Stability Under The ABS Control

Established 15 degrees of freedom vehicle dynamic model in the soft of ADAMS / View, including the model of chassis, front and rear suspension systems, steering systems, tires, etc,. Then, established ABS system control model in the MATLAB / Simlink, and ABS braking torque in the model be affected by the pedal force. Combining the two models and doing some basic simulation (such as: brake lines, intermittent braking, cornering brake), from the simulation data, analyzing the validity of the model.Based on the validity of the model, doing simulation test in the amount of abnormal conditions (such as: high speed braking in a turn, about tire pressure, brake bias case, single lane, double lane change, etc.) .Then, get the vehicle trajectory and attitude motion, analyzing the stability of vehicles in the process.Focused on the vehicle stability in braking during cornering under the ABS control, established the speed slowly change two degrees of freedom model, based on the yaw rate deviation between the speed slowly change two degrees of freedom vehicle model and the 15 degrees of freedom vehicle model, and"β-method"to determine vehicle stability during braking and then uses PID control algorithm to calculate the variation of the target slip rate, adjust a wheel target slip ratio in ABS system, so the expense of proper braking efficiency to enhance the vehicle stability in braking process. And established the corresponding simulation model, verified its effectiveness of maintaining vehicle stability during braking process, then reducing the possibility of traffic accidents in some of the abnormal conditions; on the other hand , provides an important foundation in vehicle anti-lock braking system (ABS) for further improvement and development.