EasyManuals Logo

Volvo B 200 E User Manual

Volvo B 200 E
108 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #19 background imageLoading...
Page #19 background image
Group
28
Igni
t
ion
systems
Design
and
function
-
Components
Power
stage
and
ignition
coil
Function of
power
stage
The
power
stage
(1)
functions
as
an
electronic
switch
controlling
the
current
in
the
ignition
coil
on
command
from
the
control
unit
(31.
(The
illustration
shows
the
components
of
an
EZ
-K
system. In
the
Renix-F
system,
the
power
stage is
integral
with
the
control
unit,
although
the
principle
of
operation
is
the
same
.I
The
function
of
the
power
stage
is
analogous
to
that
of
the
points
in a
mechanica
l
ignition
system,
in
that
it
alternate-
ly
opens
and
closes
the
coil
primary
ground
connection.
Each
time
a
cylinder
fires,
the
power
stage
interrupts
the
current
in
the
primary
,
inducing
a
high-tension
vol
tage
in
the secondary.
Control
signal
Once
the
control
unit
has
computed
a
timing
se
tt
ing, based on
the
signals
from
the
various
sensors,
th
e
value
is con-
verted
into
a
control
signal
for
the
power
stage.
When
this
signal
goes
high
(+5
VI,
the
power
stage
permi
ts
the
igni-
tion
coil
to
charge.
When
the
signal
again
falls
(10
0 Vl,
the
power
stage
interrupts
the
current
in
the
ignition
coil
pri
-
mary
and
the
stored
energy
is
released
in
the
form
of
a
high-tension
pulse
in
the
secondary.
Constant
charge
In
the
EZ-K
and
TZ-28H
systems
,
the
power
stage
incorporates
a
circuit
which
continuously
monitors
the
primary
cu
rrent
used
to
charge
the
igni
tion
coil
and
ensures
that
the
charging
current
remains
cons
tant
, regardless
of
engine
speed
or
battery
voltage.
This
feature is
designed
to
ensure
that
the
ignition
coil
(2) receives a
constant
charge
at all
times
, irrespective
of
these parameters. As a result,
the
charge in
the
coil is
always
a
maximum
and
the
ignition
volt-
age
remains
constan
t
ly
high.
Standing
current
protection
To
avoid
overheating
of
the
ignition
coil
if
the
ignition
is
swi
tched
on
with
the
engine
at rest,
the
control
unit
in
-
corporates
a
circuit
which
operates
the
standing
current
protection
function
via
the
power
stage. Since
the
control
unit
no
longer
receives
signals
from
t
he
Hall
generator
or
speed pick-up
(whichever
is
applicablel
when
the
eng
i
ne
has been
stopped
,
it
commands
the
power
stage
to
interrupt
the
current
in
the
primary
winding
of
the
coil.
Power
stage
cooling
Since
operation
of
the
power
stage generates heat,
the
unit
is
mounted
on
a heat
sink
attached
to
the
body.
Secure
contact
between
the
unit
and
heat
sink is essential
to
ensure
that
the
working
temperature
is
maintained
w i
thin
ac-
ce
pt
able l
imi
t
s.
The
heat
is generat
ed
by
the
power
circuit
which
ac
ts
as
the
'wo
rk
ing'
sec
tion
of
the
power
stage,
making
the
'control'
circuits
vulnerable
to
destruction.
In
systems
in
which
the
power
stage
is
integral
with
the
con
-
trol
unit,
the
former
is
mounted
on
the
inside
of
the
control
unit
frame
to
ensure
adequate
cooling.
Ignition coil
The
primary
winding
of
the
ignition
coil
in
an
electronic
ignition
system
(
wh
i
ch
generates
extremely
high
voltages
up
to
a
co
ntinuou
s
30
kV
compared
with
an average
of
15-18
kV
in a
conventional
coil)
has a
relatively
low
resist-
ance.
Consequently
,
coils
of
this
type
are fitted
with
a
plug
(4)
which
opens
to
relieve
the
pressure
in
the
unit
in
the
event
of
over
heat
ing
and
prevent
deformation
.
NOTE
:
The
plug
muat
be
fi
tted
with
a
protective
cap
in
the
case of a coil
ins
talled
vertically in the
engine
compartment.
17

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Volvo B 200 E and is the answer not in the manual?

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

Related product manuals