Table of Contents
Advertisement
Group
Ignition systems
28
Design
and
fun
ction -
_3°
0
_7
REX-I
Rex-I
On
the
Rex-I
system,
the
ent to
those
in the
EZ-K
Knock
characteristic
The figure
shows
the
'no
extremely simplified
'straight'
ed
in
relation
t
o
the normal
gine
revolutions.
Knock
steps upwards
(blue).
Knock-controlled retardation
When the
engine
is running,
signals.
The
occurrence
in
the
cylinder in question
In
and
so on,
until
Ae-advance
at
different rates
Re-advance
of
the ignition to the normal setting
ing on engine speed.
However,
Once the timing has been retarded (to
fast. Thus,
the
interva
l
At
high
engi
ne
speed,
terval
is
equ
ivalent to approx.
At
low eng ine
speed,
the
speed of about
1000
rlmin
The re
-advance
rates vary across the
34
Compensation
fu nctions
a
b
I
I
program functions which con trol
systems.
The
differences are
rmal
'
ignition setting
yellow
line).
The
sett
ing, 0.
The horizontal axis
ret
ard
ation
is
illustrated
The maximum retardation is
the
control
unit computes
of
knock
in a cylinder is
.
If the phenomenon
knock
is
eliminated.
the
steps are equal in magnitude in all
a
or morel
'a'
in the figure
is
twice
the interval
'a' duri
ng which the
80 revolutions
corresponding interval
}.
speed range,
I
I
.....
I
I
I
.. alllcd
the tendency
described
in
the
assuming,
in
th
is case,
vertical axis
ind
icates
indicates
the
by
the
downward
steps
here
denoted
t
he optimum
detected by the
control
persists,
the control unit
(a),
or until knock again
(a),
the
succeeding re-advance steps
as
long as
'b
'.
tim ing
is retarded
at an
engine
speed of
about
half that
at
h
becom
ing
slower
0
I
D
•
p-
D
D
-
•
r
I
of
the
engine
to
knock
following
pages.
that
speed
and load
the
ext
ent
to wh
ich
th
e
tim
e, as
defined by
(red)
and
re·advance by the
by
-
15'.
ignition
timing on the basis of speed and load
unit,
wh
ich
retards
the ignition
retards the ignition by a
occurs,
takes
place at d ifferent
cases,
representing an advance of
(b
(to
-3"
or
more)
is
about
6000
rI
m
in).
igh
speed
lapprox.
35 revolutions at
as
engine speed increa
Ii"
D
-
are somewhat
differ-
are
consta
nt (hence
the
timing has been
ret
ard-
a
ce
rtain
nu
mber of
en
small er
upward
by
a step of 3"
further
step of
rates
depend-
at a
t
ime.
)
are performed twice as
relatively
long
.
an
engine
ses.
·
Hide quick links:
Advertisement
Table of Contents
