Longitudinal slip control using Magnetorheological brake via Second Order Sliding Mode Controller

This paper presents an application of Second Order Sliding Mode Controller (SOSMC) to regulate the vehicle longitudinal slip using Magnetorheological Fluid (MRF) brake as an actuator for the vehicle braking system. A quarter vehicle with a simple Bingham model is adopted as the control plant and the MRF brake system model respectively. Numerical assessments are conducted for various types of the road surface with the main objective to regulate the longitudinal slip at its optimum friction value. Since the control system is regarded as a highly nonlinear environment, the utilization of SOSMC is considered as decent control solution to cope with the system uncertainties and at the same time reduced the system chattering effect caused by conventional sliding mode control. Results show that the targeted optimum slip reference can be achieved with a smooth input signal compared to conventional SMC.