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28
Ignition
systems
Design and function
Inductive
speed/position pick-up
Function
and
location
The
purpose
of the
speed/position
crankshah position. The
periphery of which
is
provided with a series
this
con
figuration
of
holes.
Construction
A. The
pick-up
(1) consists
of
the
device and a
coil
hole
or
'tooth
'
is passing the
Operation
An
alternating voltage
is induced in
tip. This variable
signal is
In
effect,
therefore.
the pick-up supplies
the
flywhee
l
from which
Signal
B.
The
frequency
of the
speed.
To provide a reference signal for the
cylinder
engines
and three
con
trol
unit
detects the crankshaft position by
passes the pick-up. This reference
-
Speed and
crankshaft
pick-up
(1) is
pick-u
p
is
mounted
close
of drilled
of a permanent magnet
(6).
The magnet
creates a
tip.
the
pick-up coil
transmitted by
a lead
the
control
the
unit
can
determine
signal (i.e.
the period
on
6-cylinder units)
signal is
position
information
to supply the
control
unit
to the flywheel
(2)
holes.
The
location of
(4).
a
pole
tip
(5)
which concentrates the
magnetic field
which
when
one of
the projections
to the
control unit.
unit with a
unique al ternating vol
both
the
engine speed and crankshah
between
two
successive
crankshah
position
,
one or more 'teeth'
on
the flywheel
/carrier
sensing
the interruption in
used to determine the top dead centre (TOC) position.
(3)
with
information on engine speed
(o
r
carrier
plate
on
automatic models), the
the
pick-up is
such
that
magnetic
varies in
strength depending on whether a
or
'teeth
'
on
the
t
age
-
an
position.
voltage peaks)
is
a measure of
(one
or
plate
are
made
longer
signal
(8)
which occurs as a long tooth
and
it is
influ
enced
by
field
at
the end
fl ywheel
passes the
elect
rical
' picture'
of
the
engine
two
in
the case
of
4-
than
th
e others.
The
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