5.3. ACTIVE STEERING SYSTEM 51
F
z2
T
w
M
R
C
m
s
g
h
h
r
a
y
ΔF
R
ΔF
L
F
z1
k
ϕ
,
c
ϕ
Roll Center
ϕ
̇
⤶
⤶
⤶
⤶
⤶
Figure 5.2: Schematic diagram of active suspension system.
linear quadratic Gaussian active suspension controller to improve the efficiency and capacity
utilization rate [49].
5.3 ACTIVE STEERING SYSTEM
Active steering systems could reduce or reverse the unstable roll maneuver by controlling the
steering angle. Active steering control is integrated with the steering system with a set of gear-
boxes that adjust steering drive according to speed. e system includes a fist-sized planetary
gear and two input shafts. One input shaft connected to the steering wheel, the other controlled
by an electric motor. As shown in Figure 5.3, the active steering can give a small superimposed
steering angle in addition to the driver’s given steering angle. When the vehicle is in danger of
rollover because of a large steering angle, the active steering system automatically adjusts the
steering angle to prevent vehicle rollover.
Active steering control can increase the turning radius, reduce the yaw motion, and effec-
tively improve the stability of anti-rollover. So, many researchers have used active steering sys-
tem as the actuator including active front steering control [32, 50–52], active rear pulse steering
control, and four-wheel steering.
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