Group
28
Ignition systems
Design and function
Overview
of
electronic
ignition
systems
-
I
TSZ
:
An
electronic ignition
system in
which
the
function performed by
contact
breaker points
conventional sys-
tems
is
carried
out
by an
induc
tive
pulse generator.
(Roughly
translated, the abbreviation TSZ
-
which stands for
Transistor
Spolen lundung - means
'Transisto
rized
coil
ignition'.) The pulse generator signals are
transmitted to
a
'co
ntrol unit
'
which
regulates
the
coil charging
period.
Th
e sys
tem
also
inco
rporate
s
a
cen
t
rifugal
generator and a
baltast resistor. Designated
TSl-4,
the
variant for 6-cylinder
engines (B28A1Ei
F
)
was
used on
700
series
cars
from
1982
to
1986.
TZ
·28H:
As
the
designat
i
on indicates
,
this
is a
trans
i
stor
i
zed
system employ
i
ng
a Hall
generator
to
supply
the
s
i
gnals
used
by
the
'
control
to
c
ontrol
the
pr
i
mary current
i
n
the
ign
i
tion
coil.
A
vacuum advance un
i
t
on
the distributor
varies the timing with
engine load
.
Although
t
he sys
tem
was
used on some
700
series models
produced in
1984
,
it
was
almost
completely superseded by other systems in
1985
as
the
new
family of
engines
entered production
.
(Un-
like other systems discussed
in
this
con
text
,
TZ-28H
is not fully electronic; indeed.
is usually regarded
as one of
the
group
of
transistorized systems
.
)
Th
e name
i
s
a
trademark of
the Bendix
company
.
In this
system
,
the
contro
l
unit.
power
stage and ignition
coil
comprise
a
single un
i
t
.
S
i
nce
'985
,
Ren
i
x-F has been used on
7405
equ
i
pped
with the B
200 K
engine and Salex
.
•
used
i
n the deS
i
gnations 01
the
var
i
ous
s
y
s
tems
are
u
sually
fr
o
m
the
maker
's
nat
i
ve
l
anguage
.
wh
i
le
the
fig
-
usually denote
the
ver
Si
on and/or var
i
ant des
i
g
n
ation
.
5
