Rear motor control for a 4WD hybrid electric vehicle stability

Vehicle stability control for a 4WD hybrid electric vehicle is investigated using the rear motor driving/regenerative braking control and electro-hydraulic brake (EHB) control. A fuzzy rule based control algorithm is proposed, which generates the direct yaw moment to compensate the errors of the sideslip angle and yaw rate. Performance of the vehicle stability control algorithm is evaluated using ADAMS/Car and MATLAB Simulink co-simulation. The co-simulation program consists of 3 parts (1) ADAMS/Car model, (2)MATLAB Simulink model and (3) interface model. It is found from the simulation results that the direct yaw moment generated by the rear motor control is able to provide the improved stability compared with the vehicle performance without any control. It is found that better performance can be achieved by applying the rear motor plus EHB control.