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2,412,690
Patented Dec. 17, 1946
UNirED STATES PATE T oFFlcE
2,412,690
’
«
IGNITION APPARATUS FUR INTERNAL
COMBUSTION ENGINES
Walter Ochsenbeìn, Bern, Switzerland, assignor to
Hasler A. G. Werke für Telephonie und
Präzisionsmechanik, Bern, Switzerland
Application June 12, 1943, Serial No. 490,706
In Switzerland February 2, 1942
2 Claims.
(Cl. 12S-148)
1
The present invention relates to improvements
in ignition apparatus for internal combustion en
gines and more particularly to an ignition system
for generating several directly consecutive sparks
„ at the same spark plug within the same ignition
period.
‘It is known that in the case of weak combusti'
' ble mixtures an increase of the engine power can
be obtained by generating on each spark plug
,
Z
.
to the remaining contact’pieces of the group are
generated with open interrupter.
`
The accompanying drawing shows a diagram
matic view of the ignition circuits of one of Vari
ous possible embodiments of the ignition appa
ratus according to this invention. It illustrates
one half of a double magneto ignition system of
' a twelve-cylinder internal combustion engine.
In the figure the reference I designates the pri
two or more directly consecutive sparks during 10 mary Winding, 2 the interrupter, 3 the blow-out
condenser, 4 the secondary winding, 5 the distrib
one and the same ignitionperiod in the cylinder.
utor, 6 the ñrst contact pieces of groups of two at
A number of means have already been proposed
a time and 8 the remaining contact pieces of each
For instance, such a number of igni
therefor.
group. All these contact pieces 6 and ß are circu
tion apparatus can be used as sparks must be
larly disposed within contacting range of the
generated per ignition order on each spark plug,
>rotatable distributor arm 5’ and each group of
so that each apparatus generates during an igni
two contiguous contact pieces 6 and 8 is con
tion periodV a single spark on one and the same
nected wth a coordinate spark plug 1. When the
spark plug. However, this proposition is not
distributor arm- 5’ passes over the contact piece
economical due to the high Weight, the usually
6 of a group the ignition current controlled by the
existing diiiiculties for driving and the high costs.
interrupter 2 flows as current impulse to the co
There is a further possibility consisting, for ex
ordinate spark plug ‘l and while the interrupter
ample, in connecting several resistances into the
is open, that is in the same ignition period, a fur
primary circuit of an ignition system. By suc
ther current impulse ñows through the same
cessively short circuiting these resistances the
magnetic iiux will be varied, whereon depends the 25 spark plug 1, as soon as the distributorV arm 5’
passes over the contact piece 8 of the same group.
induction of the ignition voltage. An apparatus
For the other half of the double magneto ignition
of this disposition requires, compared with an or
system a second distributor, 5 is provided with a.
dinary ignition device, high electric power and is,
rotatable arm which works in the same manner.
therefore, excessively heavy and voluminous.
Already known are also the apparatus for mul
tiple ignition, wherein the ignition points of dif
ferent circuits on one and the same spark plug
can be adjusted independently of one another, so
that forthwith, instead of a simultaneous igni
tion, the ignition points adjusted may occur at
intervals. The apparatus for multiple ignition
will thereby, however, no more fully accomplish
its original purpose, namely to secure a reliable
ignition.
It is an objectof the present invention to pro
vide a plurality of contact pieces circularly dis
posed within contacting range of a rotatable dis
tributor and being spaced from one another,
whereby at least two contact pieces at a time are
exclusively connected to a spark plug, so that ac
cordingly at each spark plug at least two sparks
will be generated per revolution of' said distrib- -
utor.
A further object of'this invention consists in
electrically connecting a group of at .least two
contiguous contact pieceswith a spark plug and
‘ by providing an interrupter which opens at times
`for controlling the first spark of an ignition pe
riod of each group, While the sparks coordinate
This arm, which is not illustrated, and the dis- `
tributor arm 5’ are mounted upon the shaft 9
which carries the interrupter cam l0` and the
magneto rotor» il.
-
If, as illustrated, for igniting a twelve-cylinder
four-cycle engine an ignition apparatus is used
which per revolution of the ca-m shaft generates
twenty-four high-voltage impulses, then these
impulses follow each other on each one of the
two spark plugs of a cylinder at an angle differ
40 ence of 30 degrees taken on the crankshaft. For
instance, if the ñrst spark in each cylinder jumps
- over at 40° before the upper dead-center 'posi
tion, the second ignition will occur-at 10° before `
said dead-center position.
In the case of high-speed engines it can be
diñicult to open the interrupter` or interrupters
several times at each ignition period. However, a
single opening of the interrupter, namely for the
ñrst spark, is quite suiiicient. The interrupter
may remain open during the second high-voltage
impulse. The increase and decrease, respectively,
of magnetic flux in the cores of the coils occurs
in the cited example at an adopted speed of the
magneto of 2500 revolutions per minute 60,000
times per minute, that is rapidly enough, that the
2,412,690
3
slope of the ilux curve relative to the induction
of the ignition voltage is still sufficient with the
interrupter being open. The second ignition oc
4
1. In a high tension ignition system for inter
nal combustion engines comprising a source of
current,y a. primaryl winding anda -secondaryl
curs in this case at a moment, which is advanced
winding, and an interrupter in circuit with said
primary winding, a distributor in circuit with
said secondary winding including a rotary dis
tributor lever driven by the engine synchronously
with said interrupter and a plurality of contacts
distributed circumferentially around the rotary
by the so-called breaking-off angle of about 5° to
6°, that‘ means inthe chosen numerical example
15-16" before the upper dead-center position.
Correspondingly, if the number of high-voltage
impulses per ignition period is three orv more,` the
interrupter must only beopened for generating
the first spark of the period in each cylinder and
may remain open during the rest of said ignition
period. In a magneto, wherein the changes of
flux occur, for instance, every 20° taken on the l
crankshaft of a twelve-cylinder four-cycle engine, 15
wherein, therefore, thirty-six changes of ñux take
axis of said lever adapted to be successively con
tacted thereby, said ignition system being adapted
to deliver to said distributor lever at least one
high voltage impulse for each of said contacts,
a lplurality of adjacent contacts each being con
nected to a common spark plug terminal to fire
»v across the spark gap thereof a plurality of times
place per revolution of the cam shaft, that is
al; a small phase displacement in the same igni
three changes of ilux per ignition process, only
tion period.
,
two changes of flux, for instance, that means the
_2. An apparatus as set forth in claim 1 where
first and the second .change of flux or the ñrst 20 in said source of current is a multipole magneto
and third one are used for the ignition, while the
delivering per revolution of said distributor lever
generation of a spark upon the third or the second
a number of high-voltage impulses at'fleast’equal
change of flux, respectively, is .prevented in any
to the number of said contacts, the synchronous
known manner.
drive between said distributor lever and inter
'I'he use ofthe 'ignition apparatus according tov 25 rupter
being so arranged that the contacts of
the invention is, ofcourse, not limited upon mag
the interrupter» are opened only at the time of
netos for twelve-cylinder four-cycle engines.
contact of said distributing lever with each first
They are as well adapted for magnetos of two
one ofthe adjacent contacts which are connected
cycle engines and any number of cylinders.
to a single spark plug.
What I claim is: >
_
.
so
'
WALTER QCHSENBEIN.
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