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28
Ignit;on systems
Design
and
function
Review of electronic ignition systems - I
TZ-
28"
IlENIX
F
The above figure shows
Summary
Control system
The control unit (A
) houses
The power
stage (Bl controls
unit. The power
stage
may
tion
of
the distributor
(e)
the
correct spark
plug.
directly from the
camshaft
(such
as types which employ inductive
distributor.
Sensors
The
rema
ining
components in
these
supply informat ion
parameters
Basi
c
The control
unit
is
supplied with information on eng ine
activated
by a
trigger
rotor (with
the flywheel
(on
manuals)
vided with
a
ser
ies
of holes whose passage is
The
eng ine load
(E)
measured either by means
equipped w ith an LH-Jetron
ai
r mass meter
(see
next
com prise
information which is used
4
-
Overview
A
B
C
J
the
major
componen ts
the
electronic circuits and
the
pri
mary
current in the
either
be
an integral part of
is
to
deliver
the
high-tension pulse
The
distributor may be driven either by
(horizontally
i
nstalled
speed
the
table (D-E)
on prevailing engine
four
vanes) mounted on
or
ca
rrier
pIa
Ie
(automatics).
ic
fuel injection
system
ill
ustration
).
The
various
by
ignition
D
E
of each of the
systems
the
various program functions
ignition
coil
in response to
the
control unit or a
i
nduced in
bevel
gearing
units).
In
systems
p
ick-ups)
the
limi
ng cannot be varied by
comprise part of
the sensor
running
conditions.
speed
and
c
rankshaft position
the rotor shaft
is
case,
the periphery
detected
by the
p
ick-up
of
a
vacuum
l ine anached
(i.e.
most
engines
signals
-
engine
speed,
systems
o
f all types to
F
G
described
below.
needed to
con
trol
signals
separate
unit assembled
the
secondary
winding of
it
is
which the
rotor
arm is the only moving part
alteri
system.
Together
(D)
either by
or by an inductive
pick-up mounted close to
of the flywheel/carrier
and indicated in the
form
t
o
the
intake manifold
equ ipped with EZ-K ignition
crankshaft
position
compu
te the
timi
ng
.
H
compute
the
timing.
from the
con
trol
with
it.
The
func-
the
ignition coil to
installed
vertically) or
ng
the
position of
the
with
the
con trol unit,
a
Hall
generator
plate
is
pro-
of electrical
signals.
or,
if
the
eng ine
is
systems).
by an
and enQine load -
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