Transfer Control - Subaru SVX 1992 Manual

AUTOMATIC TRANSMISSION AND DIFFERENTIAL
[M22B81 3- 2
Transfer control
The transfer hydraulic pressure control unit is fitted with
the transfer valve body attached to the side face of the
extension case via gasket and separate plate .
The hydraulic oil of the transfer hydraulic pressure
control unit is led from the oil pump delivery pressure
circuit on the transmission case front to the transmis-
sion case rear . From there it is further led to the
extension case where it is fed to the hydraulic circuit of
the transfer valve body .
The hydraulic oil pressure (line pressure) is regulated by
the transfer pilot valve, duty solenoid C and transfer
control valve for obtaining optimum rear torque distri-
bution corresponding to the driving conditions .
(1) The line pressure regulated to a proper pressure
corresponding to the driving condition is further reg-
ulated to a constant pilot pressure by the transfer
pilot valve .
(2) The pilot pressure is regulated to the transfer
duty pressure by the duty solenoid C whose duty
ratio is controlled by the TCU corresponding to the
driving condition . (The transfer duty pressure varies
with the degree of duty control .)
(3) The transfer duty pressure is applied to the trans-
fer control valve.
(4) The line pressure is led also to the transfer control
valve where the pressure is regulated to the transfer
clutch pressure by the transfer duty pressure . (The
transfer clutch pressure varies with the transfer duty
pressure .)
(5) The transfer clutch pressure is applied to the
transfer clutch and causes the clutch to be engaged .
In this way, the transfer clutch pressure is varied so
that optimum rear torque distribution
can be
achieved which corresponds to the vehicle driving
conditions .
Oil pump
Control
valve
x x
Pilot valve
Pilot pressure
Line
0
' pressure
u x
Duty solenoid C
Solenoid
pressure
-= Transfer _ _
control
u -'- u
~x~
Transfer pressure
Orifice
x Drain
C3-041
Fig. 69
89