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Volvo B 200 E User Manual

Volvo B 200 E
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Group
28
Igniti
on
systems
Design
and
func
t
ion
-
Engine
(oad in
format
io
n
1.'
091
Engine
load
information
Intake
manifold
vacuum
The
control
unit
is
supplied
with
information
on
engine
load
through
the
"acuum
line
(1)
from
the
intake
manifold.
load
information
th
rough
vacuum
line
When
the
engine
load
is
low.
the
throttle
(2l is
only
panially
open
and
the
vacuum
in
the
manifold
is
high
la
pprox
. 60
kPa
).
As
the
engine
lo
ad increases.
the
throttle
opens
furt
her and the
vacuum
in
the
manifold
gradually
falls
.
The
ignition
s
yst
em
may
receive
and
process
the
load
signal
from
the intake
mani
f
old
by
one
of
three
basic
methods
in
order
to
adjust/compu
te
the
t
iming
se
tt
ing.
Vacuum
advance
unit
A. On
the
TZ
-28H
system,
the
vacuum
line
is
connected
to a
vacuum
advance
unit
(3)
on
the
distribu
tor.
The
unit
houses a
diaphragm,
one
side
of
which
is
open
to
the
vacuum
in
the
manifold
and
the
other
to
atmosphere.
As
the
vacuum
increases
(a
t
low
engine
load
with
a
partially-open
thr
o
ttle
),
t
he
distributor
plate
is
ro
tated
to
advan
ce
the t
iming.
El
ectrical
vacuum
converter
B.
The
vacuum
line
on
the
Renix-F
sys
tem
is
connected
to
a
vacuum
con"erter
integral
with
the
con
trol
unit.
Al-
though
each
vacuum
converter
is
designed
specifically
for
a
particular
system,
the
principle
of
operation
is
the
same
in
all cases.
The
vacuum
is
applied
to
one
side
of
a
spring-loaded
diaphragm
(4
).
the
other
side
of
which
car-
ries
an
iron
core (5)
mo"ing
inside
a
coil
(6). The
coil
is
connected
to
an oscilla
tor
cir
cui
t in
the
con
tro
l
unit,
the
fre-
quency
in
wh
ich varies w
ith
the
position
of
the
core
and. as a result. is
proportional
to
engine
load.
Electronic
pressure
switch
C. On
the
EZ
-1
18K
system.
th
e
vacuum
line
IS
connec
ted
to
a pressure
switch
(7)
insi
de
the
control
uni
t.
The
device
consists
of
a
diaphragm
. a
magnet
and
a
semiconduc
tor
element.
The
diaph
ragm is
actuated
by
the
vacuum
on
one
side.
while
the
other
is a
tt
ached
to
the
magnet.
The
po
sition
of
the
magne
t
influences
the
curren
t
flow
in
the
semiconducto
r and. as a
re
sult.
the
value
of
the i
nduced
Hall voltage.
Thus.
the
voltage
is
proportional
to
the posit ion of
the
magnet
and, by
extensio
n. to the
engine
load
.
The
load
sig-
nal
is received
by
the
conve
rt
er
in
the
con
tr
ol
unit
and
used
to
compute
the
t
iming.
25

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Volvo B 200 E Specifications

General IconGeneral
Torque170 Nm
Compression Ratio9.3:1
Bore88.9 mm
Stroke80 mm
Engine ModelB 200 E
Displacement1986 cc
Power Output118 hp
Fuel SystemBosch K-Jetronic
Cooling SystemWater-cooled

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