Group
28
Ignition systems
Design
and
function
Regina
fuel
injec
t
ion
REGINA
3
1
REX-I
REX-I
Regina fuel injection system
General
The
i
nje
c
tion
system
con
tr
ol
unit
supp
l
ies
the ignition system
control
unit
with information on engine load-
acting,
in
other words, as a
'sensor'
for the
latter.
The
gas pressure in the cylinders dur
i
ng the
compression stroke
will rise
as
a greater
charge
of fuel
/
a
i
r m
i
xture
is
supplied to the engine
,
and the
ignition
system will retard the t
i
m
ing
according
as eng
i
ne
load increases.
S
i
gn
als
The
electronic pressure sensor
(3)
and air temperature sensor
(
4
)
supply
voltage signals
to the Reg
i
na
co
ntrol unit
Taken together
,
these s
i
gnals provide a measure
of
eng
i
ne load and are processed by the Regina
control
unit to
com
pute the
quantity
of
fuel
t
o
be
injec
t
ed.
Once the load
signals
have been
converted into
digital form (i.e. into
square-wave
pulses)
,
they
are transmitted
to the Rex
-
I
control unit (2).
The
digital signal
consists of current
pulses
of
a duration
(6)
proportional
to the
engine load .
•
Should
load signal
from the
control
be
lost
for any reason
,
the
ignition
system control unit
w
i
ll
compute
t
i
m
-
ing on the basis
of
loa
d
conditions,
provided
that
the
swi
t
ch is
not
closed.
27
