WO1990015241A1

WO1990015241A1 - Ignition integrated system for internal combustion motors

Info

Publication number: WO1990015241A1
Application number: PCT/IT1990/000029
Authority: WO
Inventors: Astorre Biondi; Gianni Regazzi
Original assignee: Ducati Energia SpA
Current assignee: Ducati Energia SpA
Priority date: 1989-06-01
Filing date: 1990-03-14
Publication date: 1990-12-13
Anticipated expiration: 1991-12-01
Also published as: IT8983417A0; AU5334890A; EP0474640A1; IT1235390B

Abstract

A high voltage integrated ignition system for I.C. motors, having fixed induced stator winding means which flux is changed by adjacent rotor, characterized in that said winding means includes: a "U" shaped lamellar package (PI); a shank of said lamellar package includes at least in coaxial winding: a first conductive/not conductive roll sheets winding (Lp1, Lp2) separated by insulating surfaces/sheets with respective four electric conductor terminations (1, 2, 3, 4) forming in the ensemble a condenser winded element at controlled impedance that acts as primary winding (L1), capacitor (C) and "TRIGGER" element (starting) for the SCR, a second secondary wire electric conductor winding bobbin (L2) to increase the induced voltage at a value of discharges in the ignition plug (Cd), a third electric conductor wire winding bobbin with capacity reloading function in the first winding (L3).

Description

Ignition integrated system for internal combustion motors

The present invention has for object a ignition integrated system for I.C. motors. The innovation finds particular even if not exclusive application in the small I.C. motors with one cylinder 2 phases in different sectors, as motorvehicles, etc. However the invention can be used in other I.C. motor sectors.

Ignition systems with the purpose to obtain of the good yields are well known in prior art, this I.S. includes: - a capacity reloading winding on one leg of the lamellar package by which eventually is made even the SCR Pick-up command; or said Pick-up is made separate with a further winding. - a primary winding and a secondary concentric winding and coaxial but misaligned in respect of the axis of reloading winding. These solutions require greater encumber and are complex and expensive. Purpose of the present invention is to obviate the above-mentioned drawbacks.

This and other purposes are reached with the present invention as claimed solving the exposed problems by means of a High Voltage Integrated Ignition system for I.C. (internal combustion) motors, having fixed induced stator winding means which flux is changed by adjacent rotor, characterized in that said winding means includes: - an "U" shaped lamellar package; - a shank of said lamellar package includes at least in coaxial winding: - a first coductive/not conductive roll sheets winding separate by insulating surfaces/sheets with respective four electric conductor terminations forming in the ensemble a condenser winded element at controlled impedance that acts as primary winding, capacitor, and "TRIGGER" element (starting) for the SCR ; - a second secondary wire electric conductor winding bobbin to increase the induced voltage at a value of discharges in the ignition plug; - a third electric conductor wire winding bobbin with capacity reloading function in the first winding.

In such a way the entire system of winding is integrated in a unique stator block able to explicate all the necessary functions for the ignition in the motor. Advantageously said first winding is a condenser winded element at controlled impedance with the triple function of: - primary winding; - condenser as capacitive means; - command of the spark discharge moment means, already defined as element of TRIGGER (start) for the SCR. In such a way are even eliminated the usual separate command means to establish the instant of the spark-plug discharges.

These and other advantages will appear from the successive preferred solutions by a description of same realizations with the help of the accompanying drawings which particulars of execution are not to be considered limitative but exemplificative only.

Figure 1 represents a view of the electric schema of the ignition device. Figure 2 represents a path diagram of the tension (voltage) to noticeable vacuum in the respective three windings during their operative cycle with tension positive and negative values. Figure 3 represents a view of a first forms of realization of the stator device. Figure 4 represents an alternative solution to the previous solution figure.

Making reference to figures 3 and 4, PI indicates the "U" stator lamellar package which legs are disposed adjacently gap to a magnetic known rotor for the variation of the flux in the same lamellar package PI. As per the invention a shank of the lamellar package includes at least in coaxial winding: - a first sheet roll winding with alternation of at least two conductor surfaces/sheets (Lp1/Lp2)-surfaces/insulating sheets with respective four electric conductive terminals (1 , 2, 3, 4) forming in the ensemble a condenser winded element at controlled impedance that acts as primary winding (L1 ), by capacitor (C) and by element of "TRIGGER" (start) for the SCR; - a second secondary electric conductor wire winding bobbin (L2) to increase the induced tension (voltage) at a value of discharges in the ignition plug (Cd) ; - a third electric conductor wire winding bobbin (L3) with reloading function of the capacity (C) in the first winding (Lp1 +Lp2=L1 ). As shown in the figures the primary winding (L1 ) and secondary winding (L2) can be respectively internal/external or viceversa, while the reloading winding (L3) is set in head. The electric schema is shown in figure 1 in which the inductive capacitive roll L1 (the capacitive function is indicated with "C " presents four electric conductive terminals 1 , 2, 3, 4.

The first connection 1 of a first sheet/layer winded conductor Lp1 through the recirculating diodes D1 and loading diodes D2, connects the reloading winding L3 and the circuit closes to mass with the second connection (preferably opposite) (4) of a second sheet/layer conductor Lp2 insulated by the first. The second connection of the first sheet/layer winded conductor Lp1 , placed in the opposite side of the first, results utilizable for other purposes. The first connection 3 of the sheet/iayer conductor Lp2, is connected by means of diode (D4) and resistances R1 .R2 (with function of resistive divider) to the "GATE" G of the SCR that makes bridge between the first connection (1 ) and the mass, being furthermore provided a bridge to diode D3 downwards. In the schema, the secondary is indicated with L2 and the ignition plug for the discharge of the spark is indicated with Cd.

The actuation happens as follows: The reloading winding L3 during the rotation of the rotor with magnetic insert (not disclosed but of known technique), presents a difference of potential which path is visible in the figure 4 and so such to polarize directly, for a certain time the loading diode D2, consequently the current can flush by the third winding L3 through the loading diode D2, from the terminal 1 to the terminal 4 of the first winding (condenser winded element at controlled impedance), realizing the charge of its capacity (C), closing then on the winding of reloads L3 through mass. When the potential changes sign (as indicated in figure 2) the recirculating diode D1 allows a current circulation that limits the negative potential on the reloading winding L3 to compatible values with those acceptable by the loading diode D2. Simultaneously a positive potential respect to mass is present on the terminal (3) of the first winding (condenser-inductance), such to polarize directly the control diode D4 and the "GATE" of the SCR through the resistive divider R1 .R2, having so the prime of the SCR, determining ultimately the instarrt of sparks that discharges on the plug Cd, connected to the secondary winding L2. The particular circuital solution shown in figure 1 is an oscillating current spark and the functional path is amply disclosed in the Italian patent application in the name of the same applicant IT-83550A/88 "IGNITION ELECTRONIC DEVICE FOR I.C. MOTORS". Null forbids however to adopt other solutions to unidirectional current of discharges as disclosed in the mentioned patent Application.

However is to be noted that said first winding which capacitive winded element at controlled impedance (adopted even in IT-83550A/88 which can be useful for its construction), being coaxial and concentric with the secondary winding (L2), presents with the last a coupling decidedly better respect to the third reloading winding means (L3), that is placed in head. This solution allows a good energy transfer between the first winding (capacitor winded element at controlled impedance) and the secondary winding ( L2) .

Claims

Claims 1 An High Voltage Integrated Ignition system for I.C. motors, having fixed induced stator winding means which flux is changed by adjacent rotor, characterized in that said winding means includes: - an "U" shaped lamellar package (PI); - a shank of said lamellar package includes at least in coaxial winding: - a first coductive/not conductive roll sheets winding (Lp1 , Lp2) separated by insulating surfaces/sheets with respective four electric conductor terminations (1 , 2, 3, 4) forming in the ensemble a condenser winded element at controlled impedance that acts as primary winding (L1 ), capacitor (C), and "TRIGGER" element (starting) for the SCR; - a second secondary wire electric conductor winding bobbin (L2) to increase the induced voltage at a value of discharges in the ignition plug (Cd); - a third electric conductor wire winding bobbin with capacity reloading function in the first winding (L3).

2. An ignition system as per claim 1 ., characterized in that said first winding means (L1 ) is a capacitor winded element at controlled impedance which have the triple function of: - primary winding (Lp1 - Lp2); - capacitor with capacitive function (C); - determination means of the instant of command of the discharge of the spark.

3. An ignition system as per claim 1 ., characterized in that said sheet winding roll (L1 ) is placed internally to said secondary winding.

4. An ignition system as per claim 1 ., characterized in that said sheet winding roll (L1 ) is placed externally to said secondary winding.

5. An ignition system as per claim 1 ., characterized in that said reloading winding (L3) is set in head respect to the other winding means.

6. An ignition system as per claim 1 ., consisting in an electrical circuit that includes at least: - a first connection (1 ) of a first sheet/layer winded conductor (Lp1 ) through diodes respectively of control D1 and of loading D2, that connects to the reloading winding (L3), the circuit closing to mass with the second connection (4) of a second sheet series/layer conductors (Lp2) insulated by the first; - a first connection 3 of the second sheet/layer conductor (Lp2), connects by means of diode (D4) and resistances with apportionner resistive function (R1 .R2), to the "GATE" (G) of an SCR that makes bridge between the first connection (1 ) and the mass, being furthermore provided a bridge to diode (P3) downwards.

7. An ignition system as per claim 1 .. characterized in that the reloading winding L3 is connected in the circuital system to the first winding (L1 ) in order that during the rotation of the rotor with magnetic insert, it concretizes a difference of potential such to polarize, for a certain time a loading diode D2, in order that the current can flush by the reloading winding (L3) through the loading diode D2, from the first terminal (1 ) of a first sheet conductor (Lp1 ) of said first primary winding as capacitor winded element at controlled impedance (L1 ), to an other terminal (4) of its second conductor sheet (Lp2) insulated by the first, closing then on the reloading winding (L3) through mass, and when the potential changes sign a recirculation diode (D1 ) allowing an electric current circulation that limits the negative potentials on the reloading winding (L3) to compatible values with those acceptable by the loading diode (D2), in order that simultaneously be present on the other terminal (3) of said second electric conductor sheet (Lp2) in said first capacitor-inductance winding (L1 ), a positive potential respect to mass, such to polarize directly a control diode (D4) and the "GATE" of an SCR through preferably resistive divider means R1 ,R2, for the prime (start) of the SCR, and to determine the sparking instant on the plug Cd, connected to the secondary winding L2.