Variable ratio control strategy for a rear wheel active steering

This paper presents a variable ratio control strategy for a rear wheel active steering in order to improve the vehicle control stability and obtain an ideal steering characteristic. Considering the vehicle's control response performance at low speed and driving stability performance at high speed, using an expected yaw velocity with variable ratio and linear quadratic regulator LQR optimal control method, we design a vehicle rear wheel active steering controller to ensure the tracking at expected yaw velocity. The simulation result showed that the proposed control strategy has not only improved the control response at low speed but also enhanced the driving stability performance at high speed.

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