Control the Hydraulic Stabilizer Bar to Improve the Stability of the Vehicle When Steering

Abstract

The phenomenon of the lateral instability of the vehicle when the steering is one of the extremely serious and dangerous problems. To improve safety and stability, vehicles often are equipped with stabilizer bars at the front and rear axles. However, the passive stabilizer bar cannot guarantee safe and stable performance in dangerous cases. Therefore, the active stabilizer bar is used to replace the passive stabilizer bar. The active stabilizer can automatically generate an anti-roll moment depending on the condition of the vehicle at each time. In dangerous cases, the anti-roll moment of the active stabilizer bar is much greater than the passive stabilizer bar. This research focused on the problem of establishing a spatial dynamics model in combination with a nonlinear double-track dynamic model to describe the state of oscillation of the vehicle when steering. The PID control method is used to control the hydraulic stabilizer bar. The results of the research indicated that when the vehicle was equipped with the hydraulic stabilizer bar, the values of the roll angle, the displacement of the un-sprung mass, the vertical force at the wheel, ... were significantly reduced.

Preventing the Rollover Phenomenon of the Vehicle by Using the Hydraulic Stabilizer Bar Controlled by a Two-Input Fuzzy Controller

“…The difference in the value of the roll angle now reaches about 0.79 0 (FIGURE 12), which is not a very large number. However, compared with other research [27,29], the control algorithm proposed in this paper can greatly reduce the roll angle. Furthermore, the Roll Index falls significantly.…”

“…Besides, this is an intelligent control method, and it is suitable for complex non-linear systems. However, if the vehicle only uses linear control methods such as HC [20], LQG [24], or PID [29], the vehicle's stability cannot be guaranteed.…”

“…Muniandy et al also proposed using a PI-PD controller for the hydraulic stabilizer bar [28]. Based on this view, Nguyen has shown the efficiency of the PID controller, which is used to control the operation of the stabilizer bar in his paper [29]. Besides, many other linear control methods have also been introduced [30][31][32].…”

Enhancing the Stability and Safety of Vehicle When Steering by Using the Active Stabilizer Bar

“…is algorithm is called LQG [24]. e PID control algorithm has also been used to control the operation of the stabilizer bar equipped with the model of spatial dynamics [19]. For this algorithm, three coe cients correspond to the three stages, including proportional (K P ), integral (K I ), and derivative (K D ).…”

“…Motor. e spatial dynamics model describing vehicle's oscillations was introduced in [19] by Nguyen. is model is shown in Figure 7.…”