Study On Vehicle Handling Stability By Integrated Control Of ESP And ABS

The stability of vehicle is one of the vehicle handling performance, especially the steering stability that are the important factors influencing the automobile safety performance and is directly related to the comfort and safety. As the design of vehicle system gradually improve, the development of computer technology and the requirement of environmental pollution and resource consumption, electronic control system has become a research hotspot. Electronic Stability Program(ESP) can prevent the vehicle enters the unstable working condition and make the vehicle return to the steady state quickly when it is already loss of stability. When the vehicle emergency braking, Anti-lock Braking System(ABS) can prevent wheel lock, vehicle skid or even sharp turn. The integration of ESP and ABS has become the inevitable trend of the development of automobile brake control, it can avoid wheel locking and improve the driving vehicle steering stability, so it has important significance to study the coordinated control under the complex condition.In this article, we firstly analyze the control theory and strategy of the vehicle braking stability, with body side-slip angle, electronic throttle and slip rate as control variable, studying the control strategy of fuzzy neural network fractional PID control algorithm. For vehicle instability when steering, designing the relation of coordinated control between ESP with ABS, to ensure the vehicle safety and steering stability. A car handling simulation model was built by using multibody dynamics software ADAM S/Car, as the same time, a controller model and a reference model of two degree was built in the MATLAB/Simulink. We made the simulation with ADAM S/Car and MATLAB at the condition of vehicle steering by choosing body side-slip angle, electronic throttle and slip rate as control variable, and analyzed the simulation results, to validate the proposed control strategy. We mainly analyzed the effect on the vehicle stability when ESP and ABS are working at the same time, as well as the intervention time and control of the coordination controller. We also analyzed the simulation that only one controller working or without controller working at the condition of steering when the vehicle is at a high speed. The simulation results show that the proposed coordinated controller can improve vehicle driving stability and braking stability effectively when the vehicle steering.