The Simulation And Analysis Of Vehicle Controllable Braking System

Braking system is the most important subsystem in vehicle,which plays a important role of protecting driver and improving the safety. The ABS is widespread right now. In this paper a complex mathematic model of conventional braking system is made through the analysis of component in mechanics and fluid mechanics, which then be simplied to get the main parameters that affect the dynamic performance. A new style electronic-hydraulic braking system (EHB) thatcontrollableis presentedwhich is more controllable,as the disadvantage is found through the simulation.The model of this the EHB is set up in AMESIM, and then auti-braking simulation is performed on ABS and EHB to confirm the model's robustness and correctness.Then the dynamic performance of high speed solenoid valve is studied. A PWM control strategy is presented, which can achieve the continuous control of flow. It also be performed on anti-braking simulation, finding that PWM strategy can control the flow exactly which can develop EHB's active-controlling effectively. The basic braking and assist-braking is simulated under the PWM control, which proved that EHB has better controllability.Finaly the paper studies the vehicle rollover model, which is combined with EHB model later. Then a rollover index and rollover warning strategy is presented, four dangerous status is performed on this model, the result shows that the EHB rollover control can protect the vehicle from rollover, while the vehicle without EHB rollover control do have the risk.In this paper, the simulation results are useful for reference on improving vehilc dynamic performance and controllability.