US1590892A - Tohies - Google Patents

Description

Jane 29 1926. 1,590,892

- J. A. HEANY IGNITION SYSTEM Original Filed 5 1921 2 Sheets-Sheet 1 Mi l INVENTOR. .fa/m ./Z ffdrzy MWATTORNEYS.

June 29 1926.

J. A. HEANY IGNITI'ON SYSTEM Original Filed NOVMBO 1921 2 Sheets-Sheet 2 Patented June 29, 1926.

uaiTED STATES J OHN- ALLEN HEANY, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO HEANY LABORA- TORIES, IN (2., OF NEW HAVEN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

' IGNITION sxs'rnm.

Application filed November 30, 1921, Serial No. 518,821. Renewed September 12, 1925.

This invention relates to an ignition system for internal combustion engines of that type possessing inherently self-regulating features due to a combination of normal hat- 6 tery voltage, charging battery voltage, intake cooling and explosion heating, and serving on the engine as a substitute for all of the usual apparatus required in conjunction with the ordinary spark ignition system 1 heretofore employed, as timing gears, spark coil, distributor, circuit breaker, 'condensor and high tension wiring.

The object of the invention is to provide an improved system of continuous circuit ignition for variable speed internal combustion en ines having an added means of definitely fixing the retard and advance points in the.

location of the igniting temperature of the ignition element by means of one or more re lays operating by fixed conditions of generator voltage as determined by the engine speed, these fixed conditions being either definite points along the elements by special construction or points additional to or modifying the inherentlyregulated oints of ignition as obtained by a gradual y increasing pitch winding of the ignition element itself. An ignition element of a system of the present character primarily consists of an I electric conductor to be heated by'low volt-' age direct current so constructed that its upper portion has a more concentrated heating section than its lower portion. so that at low voltage only the upper portion is heated as and as the voltage increases the element continues to become heated to an ignition temperature toward the lower portion. The fundamental principle of the improved system is that of employing an elongated metal 4i)- inember connected to be heated by an electric current passin through the member for the purpose'of firing charges in engine cylinders. This member obviously becomes heated throughout its length and owing to its peculiar form is first and more intensely heated at one end then at the other, and

1 also gradually becomes hotter throughout its length by increased voltage. The member or ignition element is preferably a relatively long strand of fine wire which is wound to form a tapered coil of gradually increasing pitch toward its lower end so that the windrugs are spaced farther apart at said lower end and if desired may be wound to form a helical coil which is also more closely wound at one end than at the other, the windings gradually increasing toward the lower end, the coils being mounted free and self-supporting or ports.

The improved system forming the subjectmatter of this invention posesses an ignition element which, as shown, consists of a helical coilof fine wire wound on a small diameter with graduall increasing pitcl. toward its lower end, an I upper end an additional helicalvcoil of the same or a; smaller size wire wound on the same or a smaller diameter and constructed so that it will heat to ignition temperature with a lower current than will the main ignition element, the entire-element being arranged to be connected by a manually operated switch to the battery current, and when the entire element is so connected the auxiliary portion at the top of the element is temperature correspondbeing provided with suitable sup-' which has added to its ay short circuits the auxiliary portion and the upper portion of the main element is heate to igniting temperature corresponding to a sem'i-advanceds ark. At a still.

higher engine s eed, at w ich the enerator produces full 0 argin main element, is heate -to igniting temperature kcorresponding to a fully advanced spar With the above and other objects in. view the invention resides and consists in the construction and novel combination and arrangement of parts hereinafter more fully described, illustrated in the. accompanying drawings, and pointed out in the appended claims, it being understood that various changes in the form, proportion, size and minor details of construction within the scope of the claims may be resorted to without dc arture from the spirit or sacrificing an o the advantages of the invention.

imilar characters of reference denote like eral figures of t e accompanying drawings forming a part of this specification, and upon Which:-

voltage, t e entire '-or .correspondin parts throughout the sev- Fig. 1 shows a sectional elevation of an I ignition element capable of use in a system modified forms of ignition elements; and

Fig. 5 shows a modified form of schematic wiring diagram.

The fundamental principle of an ignition. system of the present character is that the ignition element thereof is constituted by a tapered wire of small section, preferably mounted in a tube or casing which in turn is inserted for use in a cylinder in somewhat the same manner as the ordinary Spark lug, but does not produce a jump spark, it obviously operating by having different portions throughout its length heated sufliciently to fire a charge in a cylinder at difi'erent positions of the strokes of the pistons. I

With an engine at rest the usual battery voltage is'approximately 5.5 volts and when applied in use to my ignition element at this voltage, only a small portion near the top of thernain ignition element would normalv1y be heated to ignition temperature and an explosion would not occur until the compressed fresh charge reached almost to the top of the pocket in the tube. As the gener-' ator commences to charge, the voltage would rise to approximately 6.5 volts and the increased current due to this higher voltage would heat the main ignition element approximately at the middle. Higher engine speed would give a charging voltage of approximately 7 .5 volts and at this voltage the extreme lower end would be heated to an igniting temperature. The lower end of the main igniting element is kept some distance back from the opening into the cylinder so as'to insure some compression taking place before firing.

With more particular reference to Fig.

i 1 of the drawing, 10 represents a tubular bod member having a central longitudinal 00 et 11 formed'therein'to receive the main 1 ition element 12 which is of a general e ongated formation and mounted centrally in the pocket, the upper end of the main ignition element 12 being attached at 13 to an auxiliary ignition element 14 and the lower end of said main ignition element be ing secured in any suitable manner, as at 15, with the lower portion of the tubular body. 10 to pass the current through the element and body. The lower peripheral portion of the body may be threaded as at 16 to be located in the tapped hole of'a cylinder in which it is to be employed. From junction 13 between the main ignition element 12 and the auxiliary ignition element 14,

terminal ends 17 and 18, respectively, are carried to the outside through insulated bushings 19.

Referring more especially ta Fig. 2, wherein is shown a schematidwiring diagram with the ignition elements for four cylinders connected in the ordinary engine, 20 represents a generator, 21 the reverse current relay, 22 the storage battery, 23 the armature of the relay carrying contacts 24 for connecting the generator to the battery through the series coil 25 when the armature is closed by sufiicient generator voltage passing through shunt coil 26. 27 is a manually operated switch of double'pole type in which one pole connects through from the battery to terminals 18 of the tubular bodies and the other pole connects the battery to terminals 17 of the tubular bodies through auxiliary contacts 28 mounted on the armature 23 and closedwhen the armature 23 is in closed position. With the engine at rest, closing switch 27 causes the elements to be connected to battery current and the auxiliary portion 14 is heated to igniting temperature. After the engine is started and attains such speed that the generated voltage causes armature 23 to close, contacts 28 are closed thus short circuiting auxiliary portion ,14 and causing the upper portion of the main ignition element 12 to be heated to igniting temperature. Further increase in speed and consequent charging voltage causes the main ignition element to be heated further down and further advances the time of explosion. At any time that the engine speed drops to a pointwhere the generated voltage is below charging value, armature 23 opens and auxiliary part 14 of the element is again affected by the battery volta e only and acts similar to a retard-ed spar j I In the device just described, lead 29 from auxiliary contact 28 through one pole of switch 27 to terminal 17 of the elements is shown as a solid wire indicated by a full line. With this construction, when the relay operates and closes contacts 28, the auxiliary element 14 is practicallyshort-circuited by the low resistance by-pass of lead 29 and its temperature almost immediately drops below the igniting point. At the same time it takes a short while for the increased voltage to bringthe upper part of main ignition element 12 to, igniting temperature. Similarly when the engine speed drops and the relay opens contacts 28, ele-' ment 12 cools off and element 14 takes some time to heat up. In both cases the time lapse during the change from one section of the element to the other may be great enough to cause the engine to ms or even to stop.

This condition is overcome by introducing running at full chargingvoltage, auxiliary portion 14 of the element takes about the same current that it does when operating as retarded ignition in series with the main ignition element 12, and, therefore, it always continues at igniting temperature and fires as a retard spark until element 12 becomes heated whenthe en ine is speeded up, and when the engine speed drops, it is ready to take up the retard ignition when the relay opens and main element 12 cools ofi'. This insertion of resistance 30 therefore insures continuous firing during the change from one part of the element to the otherand at the same time bypasses enough of the current so that auxiliary portion 14 is not destroyed by overheating due to the higher voltage.

A modification of the relay type system with the added shunt resistance similar to resistance 30 just described is shown in Figs. 3 and 4, in which figures the shunt resistance is placed inside the tubular member as at 30 instead of in the external circuit. This construction serves a double purpose, making the plug entirely self-contained and eliminating the cooling eilect of the comparatively heavy 'tap wire as shown in Fig.

1 which has a tendency to conduct away sufiicient heat as to make a very definitecold spot between the elements 14 and 12 and also reducing the temperature. as well as the length of'the heated portion of these two parts of the element.

In this latter construction, the shunt resistance may be mounted as a small diameter coil 30 placed as shown in Fig. 3, or as an open mesh coil of" relatively large diameter surrounding auxiliary element 14 as in Fig. 4, or in any other suitable location. In any case, the

junction between the main and auxiliary elements would be made by spot welding or by such means as to produce no appreciable cooling effect and permit a continuous heat along the element.

.A modification of the relay construction already described in Fig. 2 is shown in Fig. 5. Instead of adding auxiliary contacts to the armature of the ordinary reverse cur rent relay as shown in Fig. 2, one or more separate relays actuated by various values of the charging voltages may be used so connected to various po nts along the ignition element as to cause successive definite points of .the element to'be heated as the speed of the engine increases. In this latter case relay 21 is not provided with auxiliary contacts 28, but another relay 31 is inserted in the generator circuit to the battery and operated by a series coil 32 so that the arma- 1 ture 33 closes some time after the generator has been connected to the battery and at such time as the generator voltage is high.

enough to cause some predetermined current to flow. This construction would prethe heating of said sections to igniting tem vent the advancing oft-heignition point at too low an engine speed and could be ad justed to operate to the'best advatnage regardless of the normal closing time of relay 21.

A feature of the present system is that when the armature 23 is open thus connecting the entire element to the battery, the resistance is higher than that of the main element 12 'by reason of the added elen'ient 14 so that ignition current taken from the battery is less thanthattaken at higher speeds, thus causing'ti lower drain on the battery at low speed running. v a

The ignition elements may be made in either conical or helical form with gradually increasing pitch-or may be made with definite steps or different uniform pitches. They may be made as self-supporting open wire coils or they may be either internally or externally supported by some insulating means or coated with some porcelaineous or other insulating omposition. The par" ticular forms of construction of the tubular bodies in which the elements are mounted does not form any material part of the invention.

This application is a continuation in part of subject matter contained in my co-pend: ing application, S. N. 489,158, filed August 2, 1921.

Having thus described my invention, what I claim and desire to secure by Letters Patent is I 1. A continuous circuit ignition system for variable speed internal combustion engines, including an ignition element havlng sections, and means for definitely controlhng perature.

2. A. continuous circuit ignition system for variable speed internal combustion engines, includin an ignition element and means for definitely controlling the heating of the different sections of said igniting element to igniting temperature.

3. A continuous circuit ignition system for variable speed internal combustion engines, including an ignition element having sections, and means inde endent of the sec-- tions for determining w ich section or sections shall be heated to ignitin temperature.

4. A continuous circuit ignition system for variable. speed internal combustion engines, including an ignition element having an added section, and means for externally controlling the heating of said section to igniting temperature.

5. A continuous circuit ignition system for variable speed internal combustion engines, including an ignition element having sections adapted to be heated and means for controlling the heating of each section to ig niting temperature, said means including relays each actuated by a different definite generator voltage dependent upon the amount of current flowing as determined by engine speed. r

6. A continuous circuit ignition system for variable speed internal combustion engines, including an ignition element having sections adapted to be heated and means for controlling the heating of each section to igniting temperature, said means actuated by different definite generator voltages dependent upon the engine speed.

'7. A continuous circuit ignition system for variable speed internal combustion engines, including an i nition element having sections ada ted to e heated to igniting temperature y variable electric current and means including relays for definitely controlling the current in said ignition sections.

8. A continuous circuit ignition system for variable speed internal combustion engines, including an ignition element having sections adapted to be heated to igniting 1 temperature by variable electric current relays for controlling current in said sections, and means whereby the consumption of current is reduced when operating on low speed.

9. A continuous circuit ignition system for variable speed internal combustion engines, including an ignition element having. sections adapted to be successively heated to.

' ignition temperature by application of different definite generator voltages dependent upon the engine speed, and means for insuring continuous igniting temperature in that section corresponding to slow speed ignition. I

10. A continuous circuit ignition system voltage variation;

sections to igniting temperature, the igniting temperature of eachsection being difiercut, and a relay controlled resistance for protecting one of said sectionsfrom overheating.

'11. A continuous circuit ignition system: for variable speed internal combustion engines, including an liflitlOll element having sections adapted to e successively heated to ignition temperature by application of difi'erent definite generator voltages dependent upon the engine speed, and means for insuringproper i iting temperature in each section during 0 anges of speed. v

. 12. A continuous circuit ignition system for variable speed internal combustion ens gines, comprising an ignition element having sections as units, and means for-successively heating said sections to ignition temperature as the speed of the engine is increased said means including an external relay device.

13. A continuous circuit ignition system for variable speed internal combustion engines comprising an ignition element having sections as units; a circuit connected to the junction point of said sections; electric power supplying means for said ignition element; and means for heating said sections to ignition temperature in accordance with Signed at New Haven in the county of New Haven and State of Connecticutthis fifteenth day of November, A. 1),, 1921.

. J OHN-ALLEN HEANY.

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