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The control
valve
assembly
consists
of
the
following
valves
See
Figure
AT
20
I
Pressure
regulator
valve
PRV
2
Manual valve
MNV
3
I st 2nd
shift valve
FSV
4
2nd
3rd
shift
valve
SSV
5
Pressure modifier valve
PMV
6
Vacuum throttle valve
VTV
7
Throttle back
up
valve
TBV
8
Solenoid downshift valve SDV
9
Second lock valve SL
V
10
2nd 3rd
timing
valve
TMV
Pressure
regulator
valve
PRV
The
pressure
regulator
valve
re
ceives
valve
spring
force
force from
the
plug
created
by
the
throttle pres
sure
16
and line
pressure
7
and
force
of the throttle
pressure
18
With the
interaction
of those forces
the PRY
regulates
the
line
pressure
7
to
that
most
suitable
for individual
driving
conditions
The oil from the oil
pump is
ap
plied
to
the
ring
shaped
area
through
orifice
20
As
a
result
the
PRV is
depressed
downward and
moves
from
port
7
up to
such
extent
that
the
space
to the
next
drain port marked
with
X
in
Figure
AT 10
opens
slightly
Thus
the
line pressure
7
is
balanced with the
spring
force
there
by balancing
the PRV
In
this opera
tion
Ihe space
from
port 7
to
the
subsequent
converter
oil pressure
14
circuit
has also been
opened
As
a
result
the
converter
is
filled
with
pressurized
oil
in circuit
14
and
this
oil
is
further used for
lubrication
of
the
rear
unit Moreover part of the oil
is
branched and used for
lubrication
of
the front
unit
for the front and
rear
clutches
When
Ihe accelerator
pedal
is
de
presscd
the throttle
pressure
16
in
creases as
described
in
the
preceding
paragraph
oil
pressure
is
applied
to
the
plug
through
orifice
21
and this
pressure
is
added
to
the
spring
force
As
a
result
the
PRV
is
contrarily
forced
upward
space
to
the
drain
port
is
reduced
and
Ihe
line
pressure
7
increases
Automatic
Transmission
11
AT095
Fig
AT 10 Pressure
regulator
ualue
When
the
range is
selected
at
R
Reverse
the
line pressure
6
is
applied
10
the
plug
in
a manner
identi
caito
the
throttle pressure
16
and is
added
10
the
spring
force
Consequent
ly
the
line
pressure
7
further
in
creases
When
vehicle
speed
increases
and
the governor pressure
rises the
theot
tle pressure
18
is
applied
to
the
port
on
the top of the
PRV
and pressure
is
applied
contrarily against
the
spring
force
As
a
result
the line pressure
7
decreases Moreover
at
individual
con
ditions
the
line pressure
7
is
equal
to
the line pressure
6
and
the throttle
pressure
16
is
equal
to
18
Manual valve
MNV
The manual lever
turning
motion is
converted
to
reciprocating
motion
of
the manual
valve
through
a
pin
and
the MNV
is
positioned
so
that the line
pressure
7
is
distributed
to the
indi
vidual line
pressure
circuits
at
each
P
R
N
D
2
or
I
range
as
shown below
P
range
7
4
SDV and
TBV
5
FSV
12
TBV and
Low
reverse
brake
R
range
7
4
same as
above
5
same as
above
6
PRY
and
SSV
F C
and band
release
N
range
D
range
7
7
None
I
Governor
valve
FSV
and
rear
clutch
2
SLY
3
SL
V
and SSV
2
range
7
I
Same
as
above
2
SL
V
9 Band
applied
4
SDV and TBV
I
range
7
I
Same
as
above
4
Same
as
above
5
FSV
Moreover
1
2
3
4
5
and
6
are
always
drained
at
a
position
where
the line
pressure
is
not
dis
tributed from
7
u
JJX
g4Vhl
d I i l l i l l t 1
dlMIi
W
ld
IiIb
It
i
B
J
jd
l tJj
fitMi
td
j
L@
x
x
j
j
P
R
N
17
l
AT7
AT096
Fig
AT
11
Manual ualvp
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