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1. (WO1990007056) DISPOSITIF ELECTRONIQUE D'ALLUMAGE POUR MOTEURS ENDOTHERMIQUES DE PETITE TAILLE
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Ignition electronic device for endothermic motors of small size

The object of the present invention is an ignition electronic device for endothermic motors particularly of small size.

The invention finds particular even if not exclusive application as ignition device for chainsaws, mowers, small debushers, energy generators, mopeds which motorization is of a single cylinder two times cycle eight motor.

In prior art is well known the principle of winding metallic foils alternated with isolating foils or isolating metallized foils for realizing a device that contains in it both inductance function and of capacity function (see Italian patent in the name of FIAT IT-865186 = FR-2051787 and Italian Patent Applications in the name of same applicant DUCATI ENERGIA IT-83490A/87, IT- 83491 A/87 = PCT/IT88/00039 and IT-83309A/88 and IT-83422A/88.)

The FIAT IT-865186 = FR-2051787 solution, foresees substantially the use of at least two bobinned insulated conductor foils in which each conductor foil presents an electrical terminal electric connection, being the electric circuit established solely from a capacitive discharges between the said two foils. In this manner is produced an electric component having inductance function and capacity, particularly suitable for the inventor to be used for ignition systems in internal combustion motors, being foreseen the variation to the respective parameters by means of displacement of the electric connection along each respective foil.
This solution even if original and innovative is not yet an optimal solution being complex in operation, in fact no practical device has been produced in this way.

The proposed DUCATI ENERGIA solution (IT-83490A/87, IT-83491 A/87 = PCT/IT88/00039, IT-83309A/88 and IT-83422A/88) foresees instead that:
- two metallic foils conductors-inductors having each one or plus connection electric ends:
- the isolation foil would have function of dielectric between the metallic foils constituting the armatures of the condenser so obtained.
The above prior art DUCATI ENERGIA solutions further disclose the use of three or more electric connection ends.

The present invention have the purpose to improve the functioning of the integrated element of inductance and capacity with a variety of applications that foresee the use of two or more electric ends connected with electric circuits in such a way to satisfy the different exigencies in the art of motorization.
- the DUCATI ENERGIA IT-83491A/87 and IT-83309/88, foresee a specific solution to which is directed the present invention by means of winding coaxial or coaxial insertion of the integrated device of inductance and capacity as primary winding for inducing a current of high tension to a coaxial secondary winding to generate a discharges under form of sparks in an ignition plug.

The present invention aims to exploit and to individuate an optimum circuit system with the use of the system of inductance and capacity device disclosed in FIAT solution further integrated with the above disclosed solutions of the same applicant where the integrated winding of inductance and capacity constitutes a coaxial primary winding for a secondary winding to generate for induction a high tension for the discharges in an ignition plug device (sparking plug/s), with the innovative characteristic that optimized and universally utiiizable for a plurality of circuits in the systems of sparking plug ignitions that is the object of the present invention.

This and others purposes are reached with the present invention as claimed solving the exposed problems by means of ignition electronic device for endothermic motors particularly of small size of the type using an integrated device of inductance' and capacity under form of bobbin realized by winding foils electrically conductors insulated electrically, coaxially disposed as primary winding, in a secondary winding for the generation of high tension to the purpose of obtaining a capacitive discharge for the generation of sparks in an ignition plug characterized in that the said integrated element of inductance and capacity :
- is associated to means that makes the respective impedance, controlled, - is endowed of four exit terminals which at least two are utilized for the connection to said means that makes the respective impedance controlled.

With this solution we reach the great advantage to realize a plurality of ignition circuits integrated in a single optimized electronic device, further low cost and notable reliability is obtained.

These and others advantages will appear from the successive specific description of preferential solutions of realization with the help of the included drawings which particulars are not to be considered limitative but solely exemplificative.

Figures 1 and 1 A represent two circuital schemas of an ignition device for the invention with fluent current of oscillating type (eg. Sinusoidal).

Figures 2 and 2A represent two circuital schemas of an ignition device for a further embodiment of the invention with current fluent of unidirectional type.
Figures 3 and 3A represent two circuital schemas of an ignition device for a further embodiment of the invention with current fluent of unidirectional type.
Figures 4 and 4A represent two circuital schemas of an ignition device for a further embodiment of the invention with current fluent of unidirectional type.
Figure 5 represents in perspective a schematized coaxial bobbin implicating : - The primary winding constituted from the said integrated device of inductance and capacity,
- The secondary winding for the generation of the high tension necessary to produce the discharges with ignition by sparks in a plug in the respective burst chamber of a motor with inner combustion, cycle "OTTO".
Figure 6 represents the developed foils of the primary winding.

Making reference to the figures is appreciated that the energy for loading the capacitive component "C" is given, through the diode "D1 " from opportune recharging winding or any other suitable electric generator of electric energy (20) associated to control means of the instant of beginning of the discharges of sparking ignition and its end, generally associated for an energy electric generator made to rotate by a transmission to the same motor (PICK-UP) not illustrated but of known technique.

The instant of sparks is given so from a command generated by the PICK-UP 10 (or others electronic devices well known to generate a command signal) that acting on the terminal of the GATE of the SCR provokes the discharges of "C" on the primary inductive component "Lp" that induces on the secondary winding "Ls" the high potential to prime the sparks on the plug.

In particular in Fig.1 and Fig.lA, two possible applications with oscillating discharging current are shown while in Fig. 2-2A, 3-3A and 4-4A are all applications regarding unidirectional discharging current.
All the figures presents the integrated device of inductance and capacity (A) with the terminals 1 ,2,3,4 in which the conductor foils are indicated as inductances (Lp) and the capacity between them is indicated as capacitor means (C).
For all these applications the loads of "C" can happen indifferently from the terminal 1 or 2.
In Fig.1-1 A the system (10) commands the prime to the SCR and the contained energy in "C" is transferred on "Lp" through the SCR. The current flows from the anode to the cathode of the SCR with sinusoidal impulse course, after that the current would have reached the "zero" value. The conduction happen in opposed direction and precisely from the anode to the cathode of the diode "D2" until the current is further zeroed for retaking with oscillatory damped course until exhaustion of the energy. The discharging current of the sparks will have so an oscillatory damped course (modulation).

In Fig.2-2A, the system (10) commands the prime to the SCR and the contained energy in "C" is transferred on "Lp" through the SCR. The current flows from the anode to the cathode of the SCR until reaching its maximum value, at this point the current continues to flow in the same sense by the SCR, the diode "D2" and the two windings to the condenser winded element for controlled impedance until exhaustion to the stored energy having, in this manner, a current of unidirectional discharging.

In Fig.3-3A, the system (10) commands the prime of the SCR and the contained energy in "C" is transferred on "Lp" through the SCR. The current flows from the anode to the cathode of the SCR until it reaches its maximum value, at this point the current start to flow, equally divided, on the two windings to the condenser winded element for controlled impedance, and the two diodes "D2 and D3 "closing through the SCR and maintaining unaltered the direction of the path until exhaustion of the phenomenon having, in this manner, an unidirectional discharging current. The functioning is however allowed also taking off one of the two diodes "D2 and D3", this however reducing the yielding of the system.

In Fig.4-4A, the system (10) commands the prime to the SCR, the contained energy in "C" is transferred on the "Lp" through the SCR.
The current flows from the anode to the cathode of the SCR until it reaches reaches its maximum value, at this point the current ceases quickly its flowing in the SCR for passing, equally divided, in the two diodes "D2 and D3" maintaining unaltered its direction of path in the two windings of the condenser element with controlled impedance until exhaustion of the phenomenon having, in this manner, an unidirectional discharging current.
The functioning being however allowed also taking off indifferently one of the two diodes "D2 and D3", this however reducing the yielding of the system.

The solutions described in Figures shows that the connections of the terminals of the winded condenser device with controlled impedance (inductive condenser) with diodes and SCR, for obtaining discharges of oscillating currents or unidirectional ones, the loading diode "D1 " can be indifferently connected to the terminal (1 or 2).

In figure 5 is disclosed that the integrated device comprises the primary winding (A) constituted with the winding of two aluminium foils AL1 and AI2 with respective four terminals (1 - 2,3-4) to the respective ends, being the foils insulated with dielectric material as polypropylene or other equivalent (Is), the all winded around a core flux conductor (N) and being around the winded foils spiroidaliy winded and insulated, a wire conductor to form an inducted bobbin (B) for the generation of the high tension, which terminals will fetch to the plug (Cd) and one connected to Earth as represented in Figures.

In this Figures the device comprises so the said integrated device of inductance and capacity (A), and having :
- a first terminal (1 or 2) of a first conductor foil (AL1 ) connected to the generator (GEN 20) via diode (D1 ), being provided in said line two bridges connected to earth, one via diode (D2) and the other via SCR which GATE (G) is controlled from a control device at the beginning of the discharges of sparking ignition (PICK-UP 10) responsible of the number of turns of the motor ; - a second terminal (4 or 3) of a second conductor foil (AI2) connected to Earth ;
- being the circuital of the secondary winding system (Ls - cd) with a terminal connected to Earth and the other connected to the ignition plug (cd) (Figs.1 - 1 A).

Alternately :
- in a first conductor foil (AM ) :
- a first terminal (1 ) is connected to the generator (GEN 20) via diode (D1 ), being provided in said line a bridge with diode (D2) that connects to a terminal (4) of the second conductor foil (AI2), and being the opposed terminal (3) connected to Earth and - the opposed terminal (2) of the first foil (AH ) is connected to Earth with SCR which GATE (G) is controlled from a control device of the beginning of the discharges of sparking ignition (PICK-UP 10) at its turns responsive of the number of turns of the motor;
- being the circuital system of the secondary winding (Ls-cd) with one terminal connected to Earth and one to the ignition plug (cd) (Fig.2).

Alternately :
- in a first conductor foil (AH ) :
- a first terminal (1) is connected to the generator (GEN 20) via diode (D1 ), being provided in said line a bridge with SCR which GATE (G) is controlled by a control device at the beginning of the discharges of sparking ignition (PICK-UP10) responsive of the number of turns of the motor and
- the opposed terminal (2) of the first foil (AH ) with diode (D2) that connects a terminal (3) of the second conductor foil (AI2), being the opposed terminal (4) connected to Earth and
- being the circuital system of the secondary winding (Ls - cd) with one terminal connected to Earth and one connected to the ignition plug (cd)(Fig.2A) .

Alternately :
- in a first conductor foil (AH ) :
- a first terminal (1 ) is connected to the generator (GEN 20) via diode (D1 ), being provided in said line a bridge with diode (D2) that connects a terminal (3) to the second conductor foil (AI2) and connected to Earth,
- the opposed terminal (2) of the first foil (AH ) being connected to the opposed terminal (3) of the second foil (AL2) via further diode (D3) and connected to Earth via SCR which GATE (G) is controlled by a control device at the beginning of the discharges of sparking ignition (PICK-UP10) responsive of the number of turns of the motor ;
- being the circuital system of the secondary winding (Ls-cd) with one terminal connected to Earth and one connected to the ignition plug (cd) (Fig.3).

Alternately :
- in a first foil conductor (AH ) :
- a first terminal (1 ) is connected to the generator (GEN 20) via diode (D1 ), being provided in said line a bridge with diode (D2) that connects to terminal (3) of the second conductor foil (AI2), and being provided a further bridge for connection to Earth via SCR which GATE (G) is controlled from a control device at the beginning of the discharges of sparking ignition (PICK-UP 1 0) responsive of the number of turns of the motor ;
- the opposed terminal (2) to the first foil (AH ) being connected to the opposed terminal (4) of the second foil (AL2) via further diode (D3) and connected to Earth ;
- being the system of. the secondary winding (Ls-cd) with one terminal connected to Earth and one connected to the ignition plug (cd) (Fig.3A).

Alternately :
- in a first conductor foil (AH ) :
- a first terminal (1 ) is connected to the generator (GEN 20) via diode (D1 ), being provided in said line a bridge with diode (D2) that connects the opposed terminal (2) of the same conductor foil (AH),
- the same opposed terminal (2) of the first foil (AH ) being connected to Earth via SCR which GATE (G) is controlled from a control device at the beginning of the discharges of sparking ignition (PICK-UP 10) responsive of the number of turns of the motor ;

- in a second conductor foil (AI2) a first terminal (3) is connected to Earth and via diode (D3) to the opposed terminal (4)
- being the circuital system of the secondary winding (Ls-cd) with one terminal connected to Earth and one connected to the ignition plug (cd) (Fig.4).

Alternately :
- in a first conductor foil (AH ) :
- a first terminal (1 ) is connected to the generator (GEN 20) via diode (D1), being provided in said line a connection bridge connection top Earth via SCR which GATE (G) that is controlled from a control device at the beginning of the discharges of sparking ignition (P1CK-UP10) responsive of the number of turns of the motor and a connection bridge to the opposed terminal (2) via diode (D2) ;
- in a second conductor foil (AI2) a first terminal (4) is connected to Earth and via diode (D3) to the opposed terminal (3)
- being the circuital system of the secondary winding (Ls-cd) with one terminal connected to Earth and one connected to the ignition plug (cd) (Fig.4A).