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Патент USA US3078401

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Feb- 19, 1963
A. BUNODIERE ETAL
INTERNAL COMBUSTION ENGINES IGNITION SYSTEMS
Filed June 1'7, 1960 _ _
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said distributor 15 rotate once
2 Claims. (Q1. 315-265)
10 studs 151 and 154 and said breaker 12 is four times closed
and four times open. Battery 1 charges the condeners of
The present invention relates to ignition devices for
the arti?cial line 5 to a potential 2U, the potential across
internal combustion engines. More particularly it is an
the terminals of this battery being U. Pulses A of alter~
object of the invention to provide an improved ignition
nating polarities are applied to the control electrode 9 of
generator of the electronic type.
semi-conductor crystal 8 by breaker 12. Whenever
An ignition system according to the invention comprises 15 the
a pulse of a suitable polarity is applied to electrode 9,
a 13.0. voltage source a ‘delay line and the primary wind
ing of a pulse transformer connected in series, a control
device having thyratron control characteristics connected
between the input of said line and said primary winding,
the control electrode of which is connected to a pulse
generator, the secondary winding of the pulse transformer
being connected to an ignition distributor.
Preferably the control device is of the multi-junction
semiconductor type.
The invention will be best understood from the follow
ing description and appended drawing given by way of
a non limitative example.
In this drawing,
FIG. 1 illustrates one embodiment of an ignition gen
element 8 becomes conductive and causes the capacitors of
the arti?cial line 4 to discharge. The voltage at point B
is shown at B in FIG. 2. Each time this occurs the voltage
at B, which was equal to 2U, falls nearly instantaneously
to zero, then will increase, in a semi-sinusoidal way, up to
2U, to collapse again when the next pulse of the same
polarity occurs. Line 4 also is a pulse shaping circuit
and rectangular pulses occur at point C. Then voltage
is raised by transformer 6 and the secondary winding 7
ultimately delivers pulses of the shape shown at D. Diode
10 avoids the harmful effects of the reverse current in
the semi-conductor thyratron 8. Transformer 6 may, ac
cording to a well-known technique, be pre-magnetized by
3O means of a permanent magnet.
erator according to the invention; and
Among the advantages presented ‘by the electronic igni
FIG. 2 shows waveforms at dilferent points of the cir
tion device of the invention, the following may be noted:
cuit.
Accurate determination of the ignition periods
According to the embodiment shown in FIG. 1, a bat
Excellent operation of the ignition, even when the im
tery 1 is connected in series with’ an inductance coil 2, a 35 pedance or the spark plug is low.
recti?er diode 3, a delay line 4 and the primary wind
It is to be understood that the invention is in no way
ing 5 of a pulse transformer 6 having a secondary winding
limited to the embodiment described and illustrated, which
7. A multi-junction semi-conductor device 8, which has
has been given only by way of example.
the characteristics of a thyratron and comprises a control
What is claimed is:
electrode 9, or another device having such characteristics, 40
1. An ignition system for internal combustion engine
is connected in parallel across line 4 and primary Winding
having spark-plugs, comprising in combination: rneans
5. A semiconductor device of this type can withstand
for generating a pulse waveform voltage having a con
peak currents of about 150 a. and reverse voltages of
trollable recurrent period; means controlled by the rota
about 40 v. A diode 10 is connected in parallel with
tion of said engine for tying said recurrence period to
semi-conductor device 8. The control electrode 9 is con 4.5 the period of said rotation; a multi-junction semi-conduc—
nected to one terminal of a circuit breaker 12 through an
tor switching device having an input for receiving said
RC circuit comprising a resistor '13 and a capacitor 11
pulsed voltage and an output; a delay line device, a trans
and having a suitable time constant for obtaining the
former having a primary and a secondary Winding; said
pulses applied to electrode 9 through the breaker 12.
delay line device and said primary winding being series
50
The latter may be of either any conventional type used
connected to said output of said multi-junction semi
in motor car engine ignition systems, or a make and break
conductor switching device; a constant DC. current volt
device of the magnetic type, for example comprising a
age source for energizing said ignition system; arectifying
rotary magnet and a moving coil or coil ensemble, such
diode series connected between said constant DC voltage
as that disclosed in the French Patent 1,183,698.
source and said delay line device, vfor preventing the dis‘
The secondary winding 7 of pulse transformer 6 is con 55 charge of said delay line in said source; an ignition rotat
nected to a distributor 15 of the ignition system. Dis
ing distributor having contact studs, means for connect
tributor 15 is mechanically or otherwise tied to the engine
ing said studs to said spark-plugs, and means for tying
16 in order to operate in synchronisrn and in phase there
the rotation of said distributor to the rotation of said
with.
engine.
For example in the FIG. 1, the engine 16 operates two
2. An ignition system for internal combustion engine
gear-boxes 17 and 18, the gear-‘box '-17 being connected
having spark-plugs, two terminal inputs, means for con
between the engine 16 and the distributor 15 and the gear
necting said terminals to a DC. constant voltage source,
box 18 ‘between said gear-box 17 and the circuit-breaker
said system comprising in combination: across said ter
12 with convenient reduction or multiplication ratios.
minals, a circuit-breaker, means controlled by said engine
65
The distributor 15 has four contact-studs 151, 152, 153
for operating said circuit-breaker in synchronism With the
and 154 respectively connected to the four spark-plugs
rotation of said engine for generating a crenel waveform
(not shown) of the engine.
voltage having a period tied to said rotation; deriving
The operation of the system shown in FIG. 1 will be
means having an input for receiving said crenel waveform
explained with reference to the diagrams illustrated in 70 voltage and an output, said deriving means comprising a
capacitor and a resistor connected in series across said
FIG. 2 and which show the voltages appearing at the
circuit-breaker and having a junction point at said output
main points of the circuit of FIG. 1, these voltages being
3,078,391
3
of the same deriving means; a control device having thyra
tron control characteristics, having an input and an out
put; means for feeding to said input of said control device
the pulsed voltages issued at said output of said deriving
means; a delay line device having an input and an ouput,
said input of said delay 2line device being connected to
said output of said control device; a recti?er diode and
an inductance coil series connected between one of said
terminals and said delay line device for preventing the
discharge of said delay line in said source; a pulse trans 10
former having a primary ‘and a secondary Winding, said
primary winding being series connected with said output
of said delay line device and with the other of said ter
.
_
4 i
v
minals; a recti?er diode bridge connected with said delay
line and said primary for clipping the negative pulse of
said delay line; a rotating distributor connected to said
secondary winding; means for tying the rotation of said
distributor to the rotation of said engine and means for
connecting said distributor to the spark-plug of said
engine.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,552,989
2,596,142
Mayer ______________ __ May 16, 1951
Gerwin _____________ __ May 13, 1952
2,967,275
Brown ______________ .._ ‘Jan. 3, 1961
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