Electric Vehicle Lateral Stability Control Design Based on Brake-By-Wire System Using Fuzzy-SMC

Abstract

This paper refers to the modeling of lateral stability control and braking torque allocation in electric vehicles solely from the brake-by-wire (BBW) system. The vehicle model uses a seven degree of freedom yaw plane model and a control scheme that makes the vehicle always stable when driving in predetermined road conditions. In addition, the case study of maintaining vehicle stability was carried out in two stages, namely, maintaining the yaw rate and side slip angle values of the vehicle and allocating braking torque to each tire using a Fuzzy-Sliding Mode controller (FSMC). The first stage uses the steering wheel angle as input and yaw moment as output. In addition, in the second stage it uses an anti-lock braking system (ABS) algorithm to control slip output and each braking device on each wheel will respond according to vehicle conditions. The analysis and results of the simulations performed illustrate an effective solution for autonomous lateral control or assisted lateral control. The response of FSMC has 16.61% better on steering input sine wave and 22.35% better on steering input step when compared to SMC without parameter optimization, making it more effective in applications in vehicle lateral stability control.