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Патент USA US2108422

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Feb. 15, 1938.
I
c. K. WOODMAN
2,108,422
SYNCHRONIZING INTERNAL COMBUSTION ENGINE
Filed Sept. 28, 1936
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In venfor"
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Patented Feb. 15, 1938
2,108,422 _
UNITED STATES PATENT OFFICE
2,108,422
SYNCHRONIZING INTERNAL COMBUSTION
ENGINE
Charles K. Woodman, Beverly, Mass.
Application September 28, 1936, Serial No. 102,969
'7 Claims.
(01.?60-97)
L
tributors. Similarconnections may extend from
the distributors to other cylinders, not shown, and
in these distributors the rotor M or “is driven
in ?xed time relation by its respective engine.
and spark plug or other ignition device. ' In one
aspect it consists in a method of synchronizing
internal combustion engines which consists in
causing a circuit breaker of one engine to control
the ignition of the other engine. In another as
5
'
ed in high tension circuit by wires l2 and 32 re
spectively to the covers l3 and 33 of two dis
The present invention relates to improvements
in synchronizing internal combustion engines
having the usual equipment of circuit breaker
The distributor l3 has a connection I5 to the
spark coil l6 of the port engine, and the distribu
tor 33 has va connection 35 to the spark coil 36
of the starboard engine. The engines are fur
pect it consists in a system including a switch or
10 other controlling device arranged in one position
10'
ther provided with independent ignition switches
to direct the ignition current from the breaker of
one engine to its own spark plugs, and in another
position for directing current from the breaker of
one engine to the spark plugs of the other.
While my invention has a broad ?eld of appli
cation to any multiple installation of internal
combustion engines, an important ?eld of use is
in connection with motor boat installation where
a pair of internal combustion engines are inde
l1 and 31 and with individual breakers 23 and 43
which are'included in their respective primary or
low tension circuits.
In the installation shown the current is sup
15
plied by a single battery 26 having a ground con
nection 21. The battery is connected to the port
engine through its ignition switch ll by wires 28
and I8 and to the starboard engine through the 20
switch H by wires 28 and 38. The low tension
2 O pendently connected to twin propellers. For
many reasons it is desirable to operate such en
side of the spark coil I6 is connected through a
wire I9 to one terminal 20 of a four-pole switch
is easier to handle in these conditions, but because 41 having a movable member which includes two
an unpleasant beat is developed when the engines . separate insulated segments 44 and 45 and a
switch lever 48, the whole switch being arranged
25 are not synchronized. The present practice is
within convenient range of the navigator. The
to provide independent mechanism for control
ling the speed of the two engines with an indica- . second terminal 2| of the switch is connected by
tor for visually showing individual speeds. Such a wire 22 to the breaker 23 of the port engine.
an installation requires almost constant vigilance The breaker is grounded by the connection 24 and 30
the cylinder ID by the connection 25 in high ten
30 on the part of the navigator and even when the
gines in synchronism, not only because the boat
25:
speed of the two engines is synchronized there is
sion circuit.
mal sailing conditions, as for example, when more
load is thrown on one engine than the other in
35 changing the course of the boat.
'
I have discovered that two engines may be
is grounded by the connection 46 and the cylinder
30 is grounded by the connection 45 in high ten
crossing the ignition circuits in such a manner
sion circuit.
40 as to cause the breaker of one engine to control
the time of ignition of the other engine.
In
practice the two engines may be independently
brought up to substantially the same speed and
then the cross-over connection e?ected. Run
nin'g' under this system it will be apparent that if
one'engine is caused to slow down on account of
increased load or for any other reason, the igni
tion timing in the other engine is retarded and
the speed of the engine correspondingly reduced.
These and other features of the invention will
be best understood and appreciated from the fol
lowing description of a preferred embodiment
thereof, selected for purposes of illustration and
shown in the accompanying drawing in which;
‘2,
.
LI
The ?gure is a diagrammatic view of the sys
tem as embodied in an installation comprising the
two engines of a motor boat.
,
In the drawing a portion l0 and a portion 38 of
the port and starboard engine cylinders are shown
60
36 is connected by a wire 39 to the third terminal
40 of the switch 41. The fourth terminal 4| of
the switch is connected by a Wire 42 to the break
er 43 of the starboard engine, and this in turn
tions involving considerable variation in load by
caused to run synchronously even under condi
50
‘
Similarly the low tension side of the spark coil
, a constant tendency toward variation under nor
as equipped with spark plugs H and 3|, connect
*
In the position illustrated in the drawing the 40
switch member occupies a position in which the
segment 44 connects the terminals 40 and 4| and
the segment 45 connects the terminals 20 and 2|.
The switches l1 and 31 are also shown in closed
condition so that current from the battery 26
?ows through the primary circuit of each spark
coil and through the breaker for the respective
engines. That is, the current flows from the bat-
tery 26, through the connections 28, I8, the switch
I‘! to the spark coil l6, of the port engine, then
through the connection Hi to terminal 20, through
the segment 45 to terminal 2|, through the con
nection 22 to the breaker 23 of the port engine
and through the connection 24 to the ground,
that ‘is to say, to the engine frame. Accordingly,
whenever the circuit is broken in the rotation oi.’
the breaker cam in the breaker 23 a high tension
current is induced into the secondary circuit and
a spark occurs in the spark plug II of the port
engine.
60
2
2,108,422
Similarly current ?ows from the battery 26
through the connections 23, 38, switch 31,
through the primary connection of the spark
coil 36, to the connection 39, terminal 40, seg
ment 44, terminal 4|, connection 42 to the breaker
43 of the starboard engine and through the con
nection 46 to the ground. Accordingly when the
primary circuit is broken in the rotation of the
breaker cam of the breaker 43 a high tension
10 current is induced in the secondary circuit of the
spark coil 36 and a spark occurs in the spark
While I have described speci?cally a motor
boat installation including a pair oi engines using
gasoline fuel the invention may be advantageous
ly applied to any multiple installation of internal
combustion engines where synchronous operation
is desirable, as in airplanes, for example.
It may
also be applied to other types of internal com
bustion engines than those shown, such as rotary
engines or engines of the Diesel type, all being
within the scope of the invention.
10
Having thus described my invention what I
plug 3| of the starboard engine. That is, both claim as new and desire to secure by Letters
engines are operating independently, each Patent of the United States is,
breaker controlling the ‘time of. ignition in the
1. The method of synchronizing a pair of in
15 engine with which it is associated. Under these
ternal combustion engines, which consists in 15
1 conditions the two engines may be independently
causing a circuit breaker of one engine to con
brought up to the same speed by manipulating trol the ignition of the other engine.
their respective throttles or in any other desired.
2. The method of synchronizing a pair of in
manner. Having brought the two engines to ternal combustion engines, which consists in in
20 substantially the same speed, the navigator may
dependently bringing the two engines up to ap
now throw the switch lever 48, 90° to the left as proximately the same speed, and then so con
shown in the drawing thus interrupting the cir
necting the ignition circuits of the two engines
cuit between the terminals 2|l--2| and 4ll—4|
that a circuit breaker of. one controls the time
and closing a circuit between the terminals of ignition in the other.
20'
20—4| and 2|-—40. ' In this shift the individual
switches I‘! and 31 are left undisturbed. The
cross-over connection thus established has the
' 3. The method of ‘synchronizing internal com
bustion engines, which consists in independently
bringing the engines up to approximately the
effect of putting the breaker 23 of the port engine , same speed while the circuit breaker of each
in control of the timing of the spark plug 3| of
30 the starboard engine, and of putting the breaker
43 of the starboard engine in control of the
timing of the spark plug || oi.’ the port engine.
The current from the battery 26 now ?ows
through the connections 28, I8, switch I1, to
the spark coil l6 of. the port engine, and then
through the connection l9, terminal 2!], segment
44, terminal 4|, connection 42 to the breaker 43
of the starboard engine. Accordingly when the
primary circuit of the spark coil I6 is interrupted
40 by the breaker 43 a spark occurs in the spark plug
H of the port engine. Current also ?ows from
the battery 26 through the connections 28, 38,
switch 31, to the spark coil 35 of the starboard
engine, and from there through the connection
45 39, terminal 40, segment 45, terminal 2|, con-'
nection 22 to the breaker 23 of the port engine.
Accordingly when in the rotation of the breaker
cam of the breaker 23 the primary circuit is
interrupted in the spark coil 36, a spark occurs
50 in the spark plug 3| of the starboard engine. I
Running with the cross-over connections thus
established, the two engines will be practically
locked in step and will continue in synchronous "
operation under all normal conditions of sail
ing. For example, the boat may be made to
swing as sharply as possible in either direction
without disturbing the synchronous operation of
the two engines. The navigator is thus relieved
of the necessity of constant vigilance and atten~
60 tion to the speed of the separate engine, and may
handle the boat with no more complication than
engine controls its own time of ignition, and then
suddenly crossing the ignition circuits so that
the circuit breaker of one controls the time of
ignition of the other.
‘
4. A system for synchronizing internal com
bustion engines each equipped with a breaker
and a spark plug, which comprises electrical con
nections and a multiple pole switch arranged in
one position for directing current to ?ow from
the breaker of one engine to its own spark plug,
and in another position for directing current to
?ow from the breaker of. one engine to the spark 40
plugs of the other engine.
; 5. A system. for synchronizing internal com~
bustion engines each equipped with a breaker, an
ignition device and a spark coil, which comprises
electrical connections and a multiple pole-switch
arranged in one position to direct current from
the breaker of one engine through its own coil
and to its own ignition device, and in another
position to direct current from the breaker of one
:engine through the coil and to the ignition device 50
of the other engine.
6. A system for synchronizing internal engines
each equipped with a breaker and an ignition de
vice, which comprises a battery, electrical con
nections and a multiple pole switch arranged in 55
one position to direct current from the battery
to the breaker of each engine and to itsown,
ignition device, and in another position to direct
current from the battery to the breaker of each
engine and to the ignition device of another en 60
gine.
-
is required by a single engine.
7. A system for synchronizing internal com
It will be understood that the installation may bustion engines each equipped with a rotary tim
include any type of commercial indicator for ing device and a plurality of spark plugs and
showing the speed of the individual engines, but having electrical connections, and a switch device
since these form no part of the present invention arranged in one position for directing the cur 65
they are not herein illustrated. As a‘matter of rent to flow from the rotary timing device of
fact however, it requires little experience to use each engine to its own series of spark plugs, and
the beat of the two engines as an indication of I in another position for directing current to ?ow
70 the proper time for throwing, the cross-over from the rotary timing device of each engine to
70
switch. This may be done at the peak of the the series of spark plugs of the other engine.
beat thus obviating the necessity of getting the
engines into perfect» synchronism by use of the
individual throttles. .
CHARLES K. WOODMAN.
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