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28
Group
Ignition systems
Design and function
Control unit
The
control unit in an electronic ignition system continuously computes the optimum
supplied by the various sensors, which
ning
conditions.
The
con trol unit
is powering
the
car, enabling
ation
taking
as little as a thousandth of a second!), the unit delivers an
The
control unit consists of a number
ments
-
converter
(A),
Converter
A.
The
converter
(A)
receives information from the sensors and
Some of the sensors supply analogue signals
temperature
sensor), while the signal transmitted by others depends on whether or not a voltage is
case of a
throttle
switch). The sensors may also transmit signals
up)
or a variable-frequency voltage (like a load signal vacuum converter).
the
form of a single, variable voltage or a series of voltage pulses, are converted into standard
converter,
the
outputs from which are used by
Memory
B.
All
programs and
pre-programmed
meters such as engine load and
Micropro cessor
c.
The
microprocessor
device selects the memory program which best meets the needs of the prevailing
14
- Components
combine
receives
immediate
it
to
compute
a new setting instantaneously. Once
of
electronic components.
memory
(B),
microprocessor
values are stored in the memory
speed
are available for immediate use by
(C)
receives the digital signals from the converter. Depending on the signal configuration,
c
B
Components
to
provide
the
unit with an extremely accurate picture of
notice of any
change
In
simplified
(chip) (C)
and output unit
converts
(such
as the temperature-dependent
in
the form of voltage pulses (like an inductive
the
microprocessor and memory.
tim
i
ng
based
in the conditions under
this
has
been
completed (in
ignition
pulse
to the power
terms, these
consist of four main ele-
(D).
the signals into digital
change
in
resistance typical
All
of
these
electrical signals,
(B),
in
which all
possible
the
microprocessor.
running
conditions.
on
information
engine run-
which
the engine
an oper-
stage.
(n
umerical) form.
of a
present
(as in
the
pick-
whet
her in
digital form by the
values of para-
the
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