US3495579A

US3495579A - Electronic ignition system with lighting

Info

Publication number: US3495579A
Application number: US645340A
Authority: US
Inventors: Jose Luis Almendro Davalillo
Original assignee: Fabrica Espanola de Magnetos SA FEMSA
Current assignee: Robert Bosch SA
Priority date: 1967-06-12
Filing date: 1967-06-12
Publication date: 1970-02-17
Anticipated expiration: 1987-02-17

Description

Feb. 17, 1970 J. ALMENDRO DAVALILLO 3,495,579

ELECTRONIC IGNITION SYSTEM WITH LIGHTING Filed June 12, 1967 4 Sheets-Sheet 1 Feb. 17, 1970 J. L- ALMENDRO DAVALILLO 3,495,579

I 4 ELECTRONIC IGNITION SYSTEM WITH LIGHTING Filed June 12, 1967 4 Sheets-Sheet 2 V WT Feb, 17, 1970' J. 1.. ALME NDRd DAVALILLO 3,495,579

smc'monic ieui'rron SYSTEM WITH LIGHTING v 4 Sheets-Sheet 3 Filed June 12, 1957 JJM r l j a T 4 J V jr j v5 v w V Feb. 17, 1970 L. ALM'ENbRb oAv'AuLLo 3,495,579

ELECTRONIC IGNITION SYSTEM WITH LIGHTING Filed June 12, 1967 4 Sheets-Sheet United States Patent 3,495,579 ELECTRONIC IGNITION SYSTEM WITH LIGHTING Jose Luis Almendro Davalillo, Madrid, Spain, assignor to Fabrica Espanola Maguetos, S.A., Madrid, Spain, a

Spanish society Filed June 12, 1967, Ser. No. 645,340 Int. Cl. F02p 1/00; Hb 37/02, 39/04 US. Cl. 123-149 5 Claims ABSTRACT OF THE DISCLOSURE The systems utilized to generate, in the form of a high voltage, the energy necessary to produce the ignition of internal combustion motors are well known.

There are systems employing a battery, such as the classic automobile system, based on the interruption of the current in the primary winding of a transformer coil.

There are systems which do not employ a battery, such as those utilized in small motorcycles and aviation motors, operating by interruption of the primary current in the transformer coil, or by transference of the current generated in a coil to the primary of a transformer coil, and also that which stores energy in a condenser during the time in which the spark is not being produced, so that at the moment of such production it may be transferred to the primary of a transformer coil.

Referring to the system mentioned third above, which is that which is normally used in motorcycles, we find the following disadvantages: Speed limit, 12,000 rpm; instability of the moment of ignition, variable from 3 to 5 at the extreme margins; mechanical gap breaker.

In the system referred to fourth above these disadvantages are magnified since the circuit breaker on being of the closure type is more affected by the revolutions.

With the device which is the subject of this patent application, the following advantages are obtained by comparison with the traditional ignition systems. The operation is purely electronic. There are no mechanical organs subject to Wear and tear, nor to any movement (except the rotor), and all the circuits are calculated and projected with safety margins which ensure an un limited life for the device as a whole.

Since there are no mechanical organs subject to wear and tear by friction or other causes (as is the case with the cam-breaker mechanism, lubricating device, etc.), once the ignition hasbeen installed in the motor, no future checks are necessary since the certainty exists that any breakdown in the motor is attributable to causes other than the ignition.

For the same reason as that indicated above, the prov duction of the spark is effected always at the same point in each cycle, independently of the speed at whichthe motor is operated, thus eliminating the oscillations of the spark which may be produced at high speed by the tolerances existing inthe circuit breakers utilized in the 3,495,579 Patented Feb. 17, 1970 hammer which may give rise to spark jumps in the admission phase is also eliminated.

The system which forms the subject of the present invention also ensures that the carburization and the advance of the ignition are not so critical as in the traditional systems and it may be observed that the motor operates properly between relatively high limits.

The invention will be described by way of indication, reference being made to the first sheet of annexed drawings in which FIGURE 1 shows the stator 1 with an even number (2n-i-2) of cores 2 (in this case eight), on which the

coils

3, 4, 5, 6, 7, 8,9, and 10 are fitted.

The 'cast aluminum rotor 11 has 2n magnets (in the case shown in the drawing there are six magnets) 12 radially magnetized with the polarities indicated, and six expansions 13 the magnets being' joined to a central yoke 14.

The circuit operates as follows:

As the rotor turns a flux is induced into the cores 2 at the end of one revolution: this is shown in FIG- URE 2. This flux generates a voltage V also shown in FIGURE 2. Similarly in the remaining cores of the stator, voltages analogous to V out-of-phase by corresponding polar angle, are introduced. By connecting, for example, two coils which are separated from one another by two polar units, for instance they coils 3 and 5, a wave such as that shown in V is obtained, which wave, as may be seen, has two positive peaks and two negative peaks, one of each of these peaks being double the amplitude of the other. In this manner one single defined signal (the high peak) is obtained for each revolution, which signal may be utilized as a synchronizing element for the purpose, for example of triggering a controlled silicon diode which, connected to a condenser and an ignition coil produces the voltages necessary for the ignition of an internal combustion engine.

FIGURE 3 shows the corresponding electric circuit, not limitative, of the ignition system with which the present patent is concerned. For example, in the

cores

3 and 5 two coils may be used, one for charging and the other for triggering, the charging coils connected to one another in opposition so that we obtain a wave like that indicated by V in FIGURE 2, and the triggering coils, also connected in opposition but inverted withvrespect to the chargecoils, a wave equal to Y also shown-in FIG- URE 2, being'obtained. This voltage V suitably. filtered, gives rise to a voltage V (FIGURE 2.). with -an impulse V capable of triggering the controlled idiode. i

Consequently thepeaky charges thecon'dense r'in accordance with thewav'eV 'whichdischarges at theinstant t into the coil, due to the trigge'r 'irnpulse V ,-thus'producing, in the secondary winding of the high-tension coil a voltage peakV capable of effecting the ignition of an internal combustion engine. e

If we connect up the coils'arranged in the

places

4, 6, '8 and 10 we obtain a wave. V (see FIGURE 4); which as may be seen 'is completely symmetrical, and capable of being used for thelighting system of the vehicle, or for charging a battery.

Analogously the rest of the coils. 7 and 9 maybe connected or utilized independently in order to obtain sup- I plementary. energy sources- The connection of the coils to one another is not limitative, and may be effected in accordance with any combination according to the needs of the case. g n

A first variant is represented in FIGURES, in which a flywheel 1 'is' shown,.' constituted by ahoop of non-magnetic material 2, 2n expansions (six in thexample) 3, 4, 5, 6, 7 and 8 and three

magnets

9, 10 andll the whole complex being cast, for example in aluminium.

The stator 29 has a number of cores, 2n+2 (in the example shown in FIGURES eight of these cores are 3 included 14, 15, 16, 17, 18, 19, 20 and 21) and the

coils

13, 22, 23, 24, 25, 26, 27, and 28 are fitted to the said cores.

The functioning is similar to that described above and indicated in FIGURE 2.

In a coil, for example that indicated by the number 22 a fiux is induced by rotating the flywheel, as is shown in FIGURE 2. Consequently by connecting two coils the distance between which is two polar units, the same re sults as those described before are obtained for the interior rotor. The remainder of the coils may be used as has been indicated above for the purposes of energising the lighting system or charging the battery, either by connecting up all the coils which occupy an even place, thus obtaining a completely symmetrical wave, or by connecting up the said coils in a suitable manner according to the necessities of the individual circumstances.

A variant of the invention is described below and is represented in FIGURE 6, in which 1 and 2 represent two alternate coils, for example 24 and 26 of FIGURE 5, and 3 a coil situated between the said coils, that is to say that represented by 25 in FIGURE 5.

The voltage generated by the two

coils

1 and 2 connected in accordance with the diagram shown in FIGURE 6, has the form V of FIGURE 7, in the special case of the 8 poles in FIGURE 5, which charges the condenser 6 through thediode 5 with the positive voltage peaks, the negative voltage peaks being cut by the diode 4 which in this manner controls, by means of the number of revolutions, the charging voltage of the condenser (see FIGURE 7, V

The wave generated in 3 of FIGURE 6, shown as V in FIGURE 7, due to the filter 9 and and to the diode 11 allows only the wave V of FIGURE 7 to pass whose peak A is that produced by the triggering of the controlled diode 8 which allows the oscillating discharge of the condenser 6 of FIGURE 6 into the coil 7 with a return circuit through the

diodes

4 and 5.

The peak B of V of FIGURE 7, although capable of again triggering the controlled diode 8 is not important, since the condenser is discharged and is without stored-up energy to produce the spark.

The remainder of the coils may be used to produce power for operating a lighting system or for charging a battery.

A new variant of this invention is the case, for example, of the six poles indicated in FIGURE 8, in which one coil is used for charging and the other for triggering, these coils being connected in accordance with the diagram shown in FIGURE 9. Referring to FIGURE 8, 1 represents a non-magnetic counterweights, and 2 represents magnets, 3 represents extensions, cast in aluminium 4, all of this constituting the rotatory flywheel. The stator 5 is formed by six radial cores 6 which carry the

coils

7, 8, 9, 10, 11, and 12.

As the flywheel turns, a flux such as that indicated by in FIGURE 10, is induced, for example, into the core 6 corresponding to the coil 9: this generates a voltage V represented in the said FIGURE 10, in the winding 9. By connecting two of these coils, for example 10 and 11, in accordance with the diagram shown in FIGURE 9, where the said coils are represented by 1 and 2 respectively, the result is that the diode 3 cuts the negative part of the V and the diode 4 charges the condenser 5 through the coil 6, in accordance with V of FIGURE 10.

Thus the voltage produced in the winding 11 of FIG- URE 8 represented by 2 in FIGURE 9, has the form represented by V of FIGURE 10, which duly filtered by the resistance 7, the condenser 8 and the diode 9, produces in the trigger terminals of the control diode 10 a voltage peak such as A shown as V of FIGURE 10. This impulse consequently triggers the controlled diode 10, permitting the discharge of the condenser 5 through the coil 6 with a return circuit through the

diodes

3 and 4 4, a discharge which produces the voltage V shown in FIGURE 10, in the secondary winding.

A further variant of the invention is shown in FIGURE 11, in which, as may be seen, six magnets 1 have been situated between each expansion 2, and in which, in addition, an expansion has been added as compared with the previous case: that is to say there are 2+1 expansions with a stator of 2n+2 cores. The flux wave obtained in the core 3 in the course of one revolution of the flywheel is that represented in FIGURE 12, which produces a voltage V in the winding corresponding to the said core.

By connecting, in this case, two coils separated from one another by a polar unit, we shall obtain a wave such as V likewise represented in FIGURE 12, susceptible to being used, as has been explained above, to effect the process of ignition in a manner similar to that described above. In the said figure, the distance a corresponds to one turn.

The nature of the invention having been sufficiently described, as well as the manner of putting it into practice, it is put on record that the arrangements of the elements indicated above are susceptible to modification of detail, provided that such modifications do not alter the fundamental principle of the invention.

I claim:

1. A magneto machine for generating charging pulse and a triggering pulse for a capacitor discharge type ignition circuit having a charging circuit for the capacitor, and a discharging circuit for discharging the capacitor through the primary of an ignition coil controlled by a gated solid state switch, said discharging circuit including a circuit for triggering said gated switch, the improvement comprising:

a rotor;

a plurality of magnetic poles disposed angularly within said rotor;

a stator disposed in coaxial, rotational relationship with said rotor;

a plurality of coils disposed angularly within said stator, said coils being responsive to the relative motion between said coils and said magnetic poles for developing individual time-related voltage waveforms from each of said coils, said plurality of coils including a first coil comprising first and second coil segments, and a second coil comprising first and second coil segments, said first segment of said first coil being connected to said first segment of said second coil in series-opposing relationship, said first coil segments being interconnected with said charging circuit to produce a resultant time-related voltage waveform generated from said connected first coil segments in the form of a charging pulse for charging said capacitor prior to a predetermined discharging time, and said second segment of said first coil being connected to said second segment of said second coil in series-opposing relationship, said second coil segments being interconnected with said discharging circuit of produce a resultant time-related voltage waveform generated from said connected second segments in the form of a triggering pulse occurring at said predetermined discharge time, said triggering pulse being ap plied to said gated switch for discharging said capacitor at said predetermined discharge time.

2. An electronic ignition system as in claim 1 wherein said plurality of magnetic poles and said plurality of coils are different in number.

3. An electronic ignition system as in claim 1, wherein said rotor rotates coaxially internal to said stator.

4. An electronic ignition system as in claim 1 wherein said charging circuit includes:

diode means for charging said capacitor to approximately the peak :positive voltage of said resultant time-related waveform and for preventing discharge of said capacitor during negative transitions of said References Cit d 5 Z wavefmn- UNITED STATES PATENTS n electronic 1gn1t1on system as in 01am 1 wherein:

said charging circuit includes a resistor-capacitor net- 2,930,326 3/1960 Dmgman 123-149 work for filtering said resultant time-related wave- 5 3,186,397 6/1955 Londonf 3,324,841 6/1967 Kebbon et a]. 123-149 said gated switch is a controlled diode device responsive 3,358,665 12/1967 Carmichael et to said filtered signal for discharging said capacitor;

and wherein LAURENCE M. GOODRIDGE, Primary Examiner said resultant time-related waveform is generated by 10 combining said individual time-related voltage wave- US Cl. X.R.

forms from said first and second coils separated from 315209 each other by two polar positions.