This study examines roll stability control for vehicles with an active roll-resistant electro-hydraulic suspension (RREHS) subsystem under steering maneuvers. First, we derive a vehicle model with four degrees of freedom and incorporates yaw and roll motions. Second, an optimal linear quadratic regulator controller is obtained in consideration of dynamic vehicle performance. Third, an RREHS subsystem with an electric servo-valve actuator is proposed, and the corresponding dynamic equations are obtained. Fourth, field experiments are conducted to validate the performance of the vehicle model under sine-wave and double-lane-change steering maneuvers. Finally, the effectiveness of the active RREHS is determined by examining vehicle responses under sine-wave and double-lane-change maneuvers. The enhancement in vehicle roll stability through the RREHS subsystem is also verified.
Height from vehicle rolling center to CG of sprung mass
hoc/m
0.11
Height from vehicle rolling center to chassis bottom
isw
17.5
Steering ratio
Variable
Value
Description
Ah/m2
0.0013
Section area of the hydraulic cylinders
V0/m3
3.77×10–4
V0=V10+V20; total oil volume in each cylinder
ps/MPa
6.0
Supply pressure
kx/(m2?s)
2.5
Valve flow gain coefficient
kp/(m5?N–1?s–1)
4.2×10–11
Total flow pressure coefficient
Ctp
0
Ctp=2Cip+Cep; total leakage coefficient of the RREHS subsystem
be/(N?m–2)
6.89×106
Effective bulk modulus of the oil
kv/(m?A–1)
0.0239
Servo-valve gain
1
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