Research On Vehicle Stability Integrated Control Strategy Based On Braking And Suspension System

Automotive Electronic Stability Program is widely used in vehicle active safetycontrol system, which can inhibit excessive or insufficient steering, and has a certainability to resist rollover of the vehicle by differential braking yaw control. But insome extreme conditions, vehicles with traditional ESP system cannot be controlledeffectively and are still in danger of rolling over. In order to achieve the stability ofthe vehicle, the stability of traditional vehicles is often controlled by a single chassissubsystem, and the influence of the chassis among each system has not beenconsidered. In this paper, the braking and suspension systems of the integrated chassiscontrol were researched, on the basis of the traditional ESP system, in order toimprove the stability and safety of automobiles.A vehicle dynamics model with8degrees of freedom covering yaw and rollmotions was established in simulation software, which was based on the "magicformula" tire dynamic model. In order to achieve the effective control of the yawingstability, differential braking control was used directly, combined with the yawingangular velocity of the fuzzy controller established in the model. For roll stability, theroll control strategies of differential braking and suspension system were establishedrespectively. An integrated control strategy including the braking and suspensionchassis subsystem was also established, combined with traditional ESP system, whichused the static threshold control method and achieved integrated vehicle stabilitycontrol. When the roll coefficient exceeded the predetermined reference value, the rollcontrol system was achieved, the roll situation was restrained. Meanwhile, the systemcoordinated the differential braking system and eliminated the influence of the rollcontrol on the yaw moment. Through the coordinative control, the comprehensivestability of the vehicle was heightened.In this article, the dSPACE simulation real-time test bench was introduced formore accurate research and testing of stability control model and control strategy.Real-time simulation results showed that the integrated control strategy could improvethe comprehensive stability of the vehicles, what’s more, it can lay a foundation forfurther study.