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AUTOMATIC TRANSAXLE - Traosaxle CorrtrollHydraulic aod Elettrooic)
21-23
ELECTRONIC CONTROL SYSTEM
(3)
Line
pressu
re
that entered the N-D control valve's
No.
5
port
exits No_
lOa
port and is fed to
the
kick-down brake
vi
~
the 1-2 shift
valve.
Also, pressure
control
pressure at
No.
10
port
is reduced by control of the
pressure
control
valve and is fed
to
the rear clutch
from
No
5c
port via
the
rear clutch exhaust valve.
As
a
resuit
when shifting
from
N
-
D. the
~ick-down
brake
operates a little laster than the rear clutch to reduce
shock
when
sifting
from N
-
D.
(4)
When
hydraulic
pressure is supplied to the
rear
clutch, at
the same
time
hydraulic pressure goes to
No_
5c
port on
the N-O control
valve left
side and to the check ball
line,
it
works
to
push
CD
land to the right
to
move
the N-D
control valve to the right.
(5j
As
~
result. the oil
line is
changed,
No.
5 port line
pressure is
fed
10 the rear clutch, and pressure control
pressure via the pressure control valve is fed to
the
kick-
down brake.
When
th
is
sequ81"lCe is completed.
the
pressure control
solenoid valve moves to D-range crl!(!p control.
The
electronic-
control system
is
basica
lly
the
same as
in
the F4A2 line but all controlS
have
been
improved
by
increasing
the
number
of
sensors and improving the performan.:e of the
control unit.
DAMPER CLUTCH CONTROL
As has been
exp lained
before IRefer
to
page 21-18L a
damper spring
is
built into
the
damper clutch
to
absorb
torque variation
in
the damper clutch
itself.
The operating conditions and operating rallge of
the damper
clutch are about the same as for the F4A2 line, and the
operating range
is
as shown
in
the
figure
on
tha
left.
HYDRAULIC PRESSURE
CONTROL
DURING
SHIFTING
In order to make possible smoother speed chan
ges,
not only
has direct detection of the
revo lutions
of the transaxle output
shaft
been
made possible but also the following two controls
have been added to hydraulic pressure
control
during speed
ch~llges
.
(1) Transax(e
input
torque feedback control <OOHC models
only)
(2)
Eng
ine
and Iransaxle total control
<OOHC
models only>
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