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198-10
4-WHEEL
STEERING
(4WS)
SYSTEM - Operation
OPERATION
The rear steering hydrau
li
c pressure is generated
by
an oil pump driven by the rear
different
ial gea r.
By controlling
this
pressure by
the
!X>wer steering
hydraulic pressure, the power cylinder connected
near
the
middle
joint
of tile trailing arms
is driven to
steer
the
rear wheels in phase with
the
fron
t
wheels_
SYSTEM CONSTRUCTION
•
The
hydraulic
power cylinder is connected to the
midd le joint
ot
the
rear
lra
ili
rIQ arms.
•
Hydrau
lic
pressure for the rear steering power
cylinder is geoorated
by an
oil
pump
driven by
the
rear differential
gear. Th is pressure is COIl-
!rolle<:! by
the
power steerirJg
hydraulic
pressure
via
the
coot",1
vaiYe. In this way.
t
he rear wheel
steering angle is control led
according
to
the
front
wnee
l
steering effort.
•
Too
oi
l
pump
for
the rear
wheel
ste<!ring delivers
the
amount
of
oil proportiona
l to
the rea
r
vvheel
speed.
Th is allows rear wheel steering ang le
control
proportional to the vehicle
speed
.1
middle
and
high speeds
[over
approx. 50 kmih
131 mphll.
•
This construction
allows
the rear wheels
to
be
stee
red in
the
same
phase with the front vvheels
when
cornering
at middle and
high
speeds.
developing
side force at the rear tires almost
simu ltaneously w ith
side force
generation at the
from tires.
,
"",,>4,
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