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To optimally allocate control authorities to co-existing active actuators, an integrated chassis controller with main/servo-loop structure is designed to coordinate direct yaw moment control and active steering. Firstly, a sliding mode controller in the main-loop calculates the desired stabilizing forces. Then in the servo-loop, by directly considering limits of road friction and actuators, a quadratic programming based control allocation approach is adopted to reasonably and optimally distribute these deisired forces to tire actuator actions. Co-simulation of Matlab/Simulink and Carsim clarifies that the proposed controller could significantly improve vehicle handling performances.

The study in the paper is aimed to develop a yaw stability controller (YSC) by way of actively dynamic distribution of the longitudinal tire forces, which is considered to be one of the promising means of chassis control, so as to substantially improve the vehicle active safety even under some critical conditions. The control law, which ensures the vehicle follow the desired dynamic model via the feedforward control of side slip angle and the fuzzy control of the errors between the desired states and the corresponding practical ones, has been designed and implemented by using the hardware-in-the-loop (HiL) simulation technology under the Matlab/Simulink environment.