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Output unit
D
.
The
digital
information supplied by
pu
lses
fed to th
e
power
Depend
ing
on
th
e
program selected at
tion
puls
e must
be delivered to
coil
in response
t
o
the
Voltage
stabilizer
The
con
trol
unit is powered by
circuits,
a
vol
tag
e stabilizer
•
Engine
limils the engine
output.
speed
limiting funct
ion
In
t
he case
of
cars equipped
erate
a
higher
level than thaI
81
converter,
with
the
anendant
•
The
control
unit memory is
terpolating between Ihese
maintained
under
all
conditions.
•
Built from
components such as
are relatively fragile
.
Since the electronics used
particularly arduous
demands.
ations,
variable voltages and
exposed.
•
In
th
e
case
of certain internal
curve.
•
In
Ihe
absence
of
a load
ates
in accordance
with the
•
the
knock sensor signal
•
The
control
unil
electronics must not
completion of
the
stoving process during manufacture may result
unit
is
normally
installed in
the
microprocessor
stage.
(This may either
t
he particular instant,
t
he
power
stage.
signals
from
th
e
output
12
V
a
supply.
However,
is
used
t
o
produce
A
ll control
units are programmed with some type
EZ-K
On
systems,
Ihe
conlroi unit uses
normally inlervenes at aboul 6200 r/min.
F
with
engines, the speed limiting function controlled by
controlled by its fuel system coun lerpart.
risk
of overheating.
programmed with
a range of speed and load values. The unit improves the accuracy of control
values, performing up to about
As many as
4000
integrated
circuits,
in cars
The equipment
mUSI
other
sources of outside interference
fault
s,
the control unit regulates the
signal,
Ihe
con
trol
unit modifies
pre-programmed.
full
is
lost. the con
l
rol unit
computes
be
location
well protected from engine heal.
is
fed 10
the
be
an
integral
part
of
t
he
control
The
latt
er con
t
rols
the
unit.
since
the
bahery voltage is
5 V
a stabilized
supply for
Ignition coil
Ihe
power slage
T
his
computations
individual settings may be
transistors, diodes and
are exposed to
a diversity
be designed to withstand vibrations. moisture,
(e.g.
from rad
ignition in
the timing
on the
basis
-load
timing
selling
when the
the timing
setting on
temperatures.
destruction
Group
Design
and function
output unit
(D)
for
conversion
t
he control
unit
or a separate
unit determines
the
current
in the primary
too
high
for
these.
of speed limiting
function. On
charging period. producing a weaker
10
interrupl lhe
spark
Ihe
ignition syslem control unil
prevents
unburnl
fuel from reaching
per minute to ensure that optimum
computed
as
required.
electronic
components
of operating conditions,
iosl
to
which the electrical system
accordance
w
ith a
fixed.
of
speed
signals
which
idling switch has opened.
Ihe
basis
of
a
'fail-safe'
For example, removal of the unit prior
.
Because of
its
sensitivity to temperature,
28
Ignition
systems
-
Components
into the
ignition
unit
.)
p
oin
t
at which
t
he igni·
winding
of
th
e
ignition
the
internal
integ
rat
ed
Bendix systems,
the
spark
10
The
set
to
op-
Ihe
catal
yti
c
by
in-
l iming
is
like
the control unit
they
are subject to
w
ide
temperature
fluctu
-
is
unavoidably
pre-programmed
timing
it
receives, and oper-
retardation of approx.
10".
to the
the
15
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