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Патент USA US3025440

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March 13, 1962
A. R. LEPPALA
3,025,430
IGNITION CIRCUIT
Filed April 8, 1959
INVENTOR.
AXEL A’. LEPPALA
ATTORNEY
grates atent ?iice
3,925,430
Patented Mar. 13, ‘1 962
1
2
3,025,430
cuit is lowered causing more current to ?ow through the
points which causes burning of the points. To meet this
I provide a greater capacity with a condenser and choke
coil. Some present day systems add a resistance but such
IGNITION cmcurr
Axel R. Lcppala, 247 ‘W. Farihault, Duluth, Minn.
Filed Apr. 8, 1959, 5er. No. 804,986
3 Claims. (Cl. 315-227)
reduces the sparks and is inadequate.
A further object of this invention is to provide added
This invention relates in general to ignition systems;
capacity to an ignition system without imposing extra
in particular it concerns an improved ignition circuit for
wear upon the breaker points.
use in internal combustion engines of the spark ignition
These and other objects and advantages of the inven
or otto cycle type.
1O tion will be apparent from the following description taken
Most automobiles and a large percentage of trucks,
in conjunction with the accompanying drawing in which
busses, airplanes and motor boats, as well as a consider
is shown a representation of the invention by way of il
able number of stationary power plants and prime movers,
lustration only.
use spark ignition engines. It is well known that engine
In the drawing:
manufacturers constantly tend to upgrade the perform 15
The FIGURE is a circuit diagram showing the inven
ance characteristics of their products, resulting almost
tion added to a conventional ignition system.
annually in increased horsepower, motor speeds, com
Referring now to the circuit shown in the FIGURE of
pression ratios and efficiencies. This pattern of improve
the drawing wherein a typical ignition system of an auto
ment is generally accompanied by liberal additions in the
mobile engine is shown, the features of my invention are
number of power accessories normally found in automo 20 enclosed within the dotted outline of the circuit.
biles and the like.
The primary winding 17 of coil 16 is connected across
The result is to seriously tax the electrical system ‘of
battery 14 in series with the interrupter or breaker point
the average automobile engine and to require larger
contacts 12. The ignition coil 16 consists of a primary
amounts of electrical energy both at the ignition end of
winding 17 of relatively few turns and a secondary wind
the system and for the requirements of the electrically 25 ing 19 with a comparatively large number of turns, both
driven accessories continuously being introduced. To
wound over a laminated iron core 15.
this end the majority of American cars and practically
Contacts 12 in
the interrupter are closed and opened by a rotating cam
all of the European cars now use 12 volt electrical sys
tems to answer the needs of present day requirements.
(not shown), the number of lobes of the cam correspond
ing to the number of cylinders. The contacts 12 are
closed for a time which is sufficient to permit the ?ux in
the core 15 of the ignition coil 16 to build up to a sub
However, in spite of the developments made in the
direction of higher capacity electrical systems, little if any
attention has been given to the problem of reducing the
stantial value.
effect of the increased energy upon certain vital engine
Contacts 12 then open suddenly. This
induces a high
in the secondary 19 which causes
the ignition spark to jump across the points 18 of the
components. Among those components directly affected
by higher voltage levels is the breaker contacts or points 35 spark plug. The energy which is stored relatively slowly
in the ignition system. Ordinary efforts designed to
in the magnetic ?eld is thus suddenly released and appears
minimize burning, pitting or similar deterioration of the
as heat energy between the points 18 of the spark plug.
breaker points have included such means as shunting a
condenser across the points to suppress the are when the
Condenser ltl shunted across contacts 12 serve to some
extent to suppress the are when contacts 12‘ are open.
contacts open. A resistance having a high temperature 40 However, it is known that some of the energy stored in
coefficient is sometimes placed in series with the primary
the magnetic ?eld of the core, especially in recently de
to prevent overheating of the points when they are closed
veloped high performance engines, ?ows back through
and the ignition switch happens to be inadvertently left
the primary side of the system causing contacts 12 to
closed. These strategems, while adequate for engines
burn or otherwise suffer a diminution of their e?‘iciency
having low potential electrical systems are simply not 45 through corrosion, oxidation or pitting.
suitable for modern engines as experience has shown that
To alleviate this condition, I provide, ?rstly, a by pass
the breaker points in the newer cars need replacement
condenser 32 connected between contacts 12 and primary
much oftener than before.
winding 17 of coil 16 and grounded as at 44. Condenser
Accordingly, it is a broad object of the present inven
32 serves to provide added capacity for the system with
tion to provide an improved ignition system adapted for 50 out affecting the condition of the contacts 12. Then I
use in engines having high performance characteristics.
introduce into the circuit a low resistance inductance coil
It is another object of this invention to provide in an
30 between the conventional condenser 10 and my added
ignition system of a spark ignition engine a novel means
condenser 32.
Coil 30 which may be referred to as a choke coil is
Another object of this invention is to provide a novel 55 preferably wound around condenser 32. Coil 34} offers
and improved electrical circuit designed to prevent arc
little or no D.C. resistance to the ignition system and
for prolonging the life of the distributer breaker points.
ing between the breaker points of an ignition system.
A further object of this invention is to provide an
easily manufactured low cost accessory ‘for reducing
breaker point deterioration,
A still further object of this invention is to provide a
acts as a shock absorber to block surges of current from
coil 17 to contacts 12. The surges are directed to ground
at 40 by condenser 32.
60
The device as illustrated, permits the normal ?ow of
DC. current therethrough to saturate coil 30.
In most
device easily connectable between the coil and the dis
cases however, after contacts 12 have opened and a spark
tributer of a 4 cycle engine whereby burning and oxida~
has been produced, a high voltage is induced in the
tion of the breaker points may be prevented.
primary 17 of coil 16 which ?ows back through contacts
Another object of this invention is to provide facile 65 12 as they close causing burning and oxidation of the
means for preventing high voltage peaks in the primary
points. Excessive peak voltages are reduced by the com
circuit of an ignition system.
bination of condenser 32 and coil 30 thereby prolonging
Another object of this invention is to provide an im
the life of contacts 12 as well as providing extra energy
proved ignition system adapted to facilitate cold weather
for cold weather starting.
starting without excessive break point deterioration. As 70 The entire device is adapted for easy installation in an
the temperature drops the resistance of the primary cirq
automobile and is preferably encapsulated in a plastic or
3,025,480
4
primary and secondary windings, an output circuit for
said spark coil including said secondary winding, a
primary circuit for said spark coil including said primary
ceramic case. The electrical characteristics of the con
denser 32 and the choke coil 30 may be varied to suit
different applications. A typical unit may be cased in
a housing about the size of an adult thumb having a
ground connection at the bottom and a wire lead for con~
nection with the breaker points extending from the top.
A third connection at the top is provided connection to a
lead from the primary side of the ignition coil.
winding, a battery connected at one terminal to one end
of said primary winding, a circuit breaker connected at
one terminal to the other terminal of said battery and a
?rst condenser shunting said circuit breaker, the combina
tion of a choke connected to the other terminal of said
circuit breaker and to the other end of said primary wind
Thus I have set ‘forth the details of a new ‘and im
proved ignition accessory designed to prevent the break 10 ing and a second condenser connected to the last referred
to terminal of said battery and to the last referred to end
down of ignition points resulting from excessive voltages
of said choke.
and to provide extra capacity in low temperatures. The
3. In a spark ignition system, a spark coil having
device is characterized by a high degree of capability,
primary and secondary windings, an output circuit for
yet it is inherently rugged in construction, requiring no
electron tubes, complex mechanical parts or other features 15 said spark coil including said secondary Winding, a
primary circuit for said spark coil including said primary
that Would tend to cause malfunctioning or Wear.
winding, a grounded circuit breaker, a grounded con
Although I have described my invention in particular
denser connected to said circuit breaker at a locality above
ground and shunting the same and a grounded battery
terms, it is understood that I am not limited thereby, but
limit my invention by thescope of the appended claims.
I claim:
1. In a spark ignition system a spark coil having
primary and secondary windings, an output circuit for
20 connected to one end of said primary winding, the com
bination of a unit comprising a condenser and a low
impedance choke consisting of a coil of wire wound about
the condenser and having one end connected to one termi
nal of the condenser and to said primary winding, the
winding, a grounded circuit breaker, a grounded con 25 other end of said choke being connected to the circuit
breaker at its terminal above ground and the other end
denser connected to said circuit breaker at a locality above
of said condenser being connected to ground.
ground and shunting the same and a grounded battery
connected to one end of said primary Winding, the com
References Cited in the ?le of this patent
bination of a choke connected to one end of said circuit
breaker and condenser at a point ‘above ground and at 30
UNITED STATES PATENTS
its other end to the other end of said primary winding,
2,389,639
Williams _____________ .. Nov. 27, 1945
and a grounded condenser connected to said choke and
2,440,154
Oles _________________ __ Apr. 20, 1948
said spark coil including said secondary Winding, a
primary circuit for said spark coil including said primary
to said primary Winding at the last referred to ends
thereof.
2. In a spark ignition system, a spark coil having 35
2,443,060
Wall ________________ __ June 8, 1948
2,819,428
Bowlus et a1. __________ __ Jan. 7, 1958
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