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Volvo B 200 E User Manual

Volvo B 200 E
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Group
28
Ignition
systems
Design
and
function
-
Speed
and
crankshaft
position
information
Speed
and
crankshaft
position
information
A
8
=:;:;)
N
Hall
generator
Function
and
location
The
Hall
generator
(1)
supplies
the
control
uni
t
with
information
on
engine
speed
and
crankshaft
position.
The
de-
vice
is
mounted
inside
the
distributor
cap.
Construction
:
The
generator
is
based
on
th
e
principle
of
the
Halt effect,
whereby
the
flow
of
current
in a
semiconductor
is
deflected
if
the
componen
t is
exposed
to
a
magnetic
field.
This
causes a
potential
difference
(i.e. an excess
of
elec
tr
ons
on
one
side
of
the
semiconduc
tor
and
a
deficiency
on
the
other).
producing
a
voltage
known
as
the
Hall
vol
tage.
Following
amplification,
this
voltage
is
employed
by
the
cont
r
ol
unit
as a
signal
to
con
trol
the
timing
.
The Hall
generator
(1) is a
U-shaped
element
w i
th
an
opening
for
the
trigger
ro
tor
(2).
The
number
of
rotor
vanes
is
the
same
as
the
number
of
cylinders
in
the
engine.
The
generator
consists
of
a
Hall
-Ie
element
(3)
co
mprising
a Hall
effect
detector
and
a
transistor
amplifier
. A
magnet
(4)
with
a
three
-
pole
connector
(5) is
located
on
the
opposite
side
of
the
rotor
to
the
Hall
·
IC
element
.
The
connec
tor
term
inals
are
connected
respectively
to
a 12 V
supply
(+),
a 5 V reference
signal
from
the
control
unit
(01
and
ground
(-)-
Signal
A. In
th
is
position,
the
magnetic
field
is
blocked
by
the
tr
igger
rotor
vane
and
the
Hall
effect
is
absent.
No
voltage
is
induced
in
the
Halt-IC
element
and
the
ground
connection
rema
ins
open.
As
a
result,
a 5 V
signal
is
present
atter-
minal
(01.
B.
In
this
position,
the
rotor
exposes
the
Hall·
IC
ele
ment
to
the
influence
of
the
magnetic
f
ield
and
the
resultant
Hall
voltage
is fed
to
the
transistor
amplifier.
The
5 V
signal
at
terminal
(0) is
then
connected
to
ground
across
the
H
terminal
and
the
voltage
at
(0) falls
to
0
V.
Thus,
the
signal
from
the
Hall
generator
varies
between
0
and
5 V in
the
form
of
a
square-wave
signal,
the
control
unit
deriving
its
engine
speed
information
from
measurement
of
the
duration
of
the
alternating
half
waves.
Thp.
crankshaft
position
signal
is
obtained
by
adjusting
the
basic sett
ing
of
the
distributor
to
coincide
with
the
posi
t
ive
flank
of
th
e Hall
generator
signal
(i.e.
the
half-wave
generated
when
the
rotor
blocks
the
magnetic
field)
a
few
cranksha
ft
degrees
before
TDC.
20

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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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