DE1764420A1 - Electronic ignition device with discharge capacitor for internal combustion engines - Google Patents

Description

DIPL. ING. C. STOBPBL · DIPL. ING. W. GOLLWITZEB DIPI * ING. MÖLI, LANDAU / PTAIiZ AM 8CHÜTZDNHOF

May 31, 1968 * Eh.

Ateliers de la Motobecane, Pantin, France

"Electronic ignition device with discharge capacitor for internal combustion engines"

The invention relates to improvements to the electronic ignition device with discharge capacitor for internal combustion engines, how they z. B. already in the German patent specification ..... (German patent application No. A 46.449 of August 29, 1964} of the applicant is described. There, the regulation of the voltage, which is necessary for the supply of the circuit, was carried out by the assignment a load resisting stand with a capacitor to an inductance of the Winding ensured. The present improvements are essentially aimed at simplifying the apparatus, reducing it the manufacturing costs, a reduction in the space required and a spatial allocation of the device parts, their attachment and facilitate storage.

According to a first feature of the invention, the resistor is Ladewi the aforesaid apparatus of elimination and is

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a throttle (or regulator bridge) replaced, which is arranged in parallel on the main armature of the coil of the generator (magnetic flywheel) is. The simplification, the gain in space and the savings that are achieved in this way are by no means negligible, because this charging resistor of 4,700 ohms and an output of 40 watts In the present particular application, represents an extensive and relatively expensive element that must have cooling fins.

Another feature of the invention consists in the division of the device into three separate groups, wherein this division at the same time facilitates the assembly and the possible replacement of the individual elements. The first of these groups consists of the generator (magnetic flywheel), which, due to the omission of the charging resistor β, is only the armature as essential organs includes with its winding and the electromagnetic induction transmitter. The second group consists of an electronic block, the consists of the thyristor, the three diodes, the polarization resistor and the capacitor, which are ready for the device according to FIG earlier application, all of these elements being immersed in a mass which effectively protects them against bumps and moisture. Such an electronic block can in practice be of very small dimensions.

The third group consists of the transformer (high-voltage ignition coil) and can be brought into close proximity to the spark plug will. This group preferably includes the means of direct connection to it.

According to the invention, a simpler mass is also obtained connected switch with key is provided, which is connected to the connection terminal of the magnetic disk, where the off »

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vs: a & 0 Γ.Λ3 ORIGINAL INSPECTED

The inductor's output wire ends to stop the motor Allow, He also provides an anti-theft device more effective Kind of

Only three conductors connect the magnetic flywheel and the electronic block, while a single conductor connects this and that Ignition coil connects · The second and third groups with their conductors represent a single unit made with a suitable plastic material is sheathed that has the necessary flexibility to allow easy attachment to the engine to be equipped.

The only two connections that have to be made during assembly are the connection with the terminals of the magnetic flywheel at one end and the connector to the candle at the other end of the unit.

The \ ^r orrichtung is so simple that in the case of multi-cylinder engines can be provided with its own electronic ignition means of each of the cylinders, eliminating the need for fragile and off moisture very easily responsive manifold. The functional reliability is increased, all the more since this device is completely autonomous and works without the involvement of a battery, which is always a perishable element and requires maintenance.

Its complete tightness makes the device particularly suitable for attachment to boat engines.

The speed and ease of assembly, the small footprint and the low manufacturing costs ultimately allow that the user has complete units in reserve for possible replacement

holds. 009849/0754

BAD OWQfNAL

Further features of the invention and details of the advantages achieved by the same emerge from the following description an embodiment example of the subject matter of the invention shown in the attached echematic drawings.

Fig. 1 is the overall scheme of the ignition device according to the invention,

Fig. 2 shows the first group of elements, which is built into the magnetic flywheel,

Fig. 3 is a detailed view of this group in a modified embodiment,

Fig. 4 shows a longitudinal section through the coil device of the magnetic flywheel and the regulator bridge,

Fig. 5 shows in an exploded view the second group of elements, i.e. the electronic block,

Fig. G shows this electronic block in an external view and on a smaller scale,

Fig. 7 shows the high voltage ignition coil associated with the spark plug, and

Finally, FIG. 8 shows, on a smaller scale, the entirety of the arrangement from the outside.

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The voltage required to power the circuit is supplied by coil 1 of the magnetic flywheel. The after The choke provided of the invention, designated 24 and which will be described later, regulates the voltage on the Connection terminals of the capacitor safe.

A diode 3 sets up the positive half cycle of the magnetic flywheel supplied current equal and another diode 4 short-circuits the negative half cycle. It is with a variant too possible to use a bridge circuit to rectify the two half cycles.

When the thyristor 6 is ignited, the energy stored in the capacitor 5 becomes the primary winding 7a of the high-voltage ignition coil 7, the secondary winding 7b of which is connected to the candle 25. This ignition is carried out by the electromagnetic induction transmitter caused, which is designated by 12 in its entirety. A resistor 9 polarizes the control electrode of the thyristor 6 and makes it possible to determine the ignition sensitivity of the latter.

A threshold diode 8, which is connected directly in series with the circuit of the induction generator 12, suppresses the negative half period, which is supplied by the windings of this circuit and limits the minimum trip threshold. So the disturbances, which could arise and which have a lower value than this threshold, no untimely triggering of the thyristor 6 vorru fen.

The one at the placement after the earlier registration of the applicant The necessary resistance between the induction transmitter and the threshold diode is therefore eliminated according to the present invention.

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The induction generator 12 is mounted on the stator 13 of the magnetic flywheel inside its rotor 14 and consists of essential (Fig. 1) from a magnet with two coils 15a and 15b, whose cores 16a, 16b absorb the flux at the poles of this magnet. The two cores 16a and 16b are arranged in a plane which runs through the axis of the crankshaft 17. The hub 18 of the rotor 14 carries a tongue 19, which with each revolution in front of the cores 16a, 16b of the inductor passes "with a narrow air gap 2o, Fig. 1, is provided. On the other hand, an exit air gap 21 is provided between the cores 16a and 16b opposite the tongue 19.

The two coils 15a and 15b of the induction generator 12 are located in Series for the useful magnetic flux and are opposite for the Parasite fluxes coming from the magnetic field of the rotor 14. A shielding of the entire induction transmitter is necessary in order to the residual disturbances, which are due to the asymmetry of the flow, to switch off, this shielding advantageous for the Assembling the various elements used that make up the unit form.

The throttle 24 has the task of reducing part of the main flow proportional to the increase in the magnetic resistance of the main flow derive circuit «thereby a good regulation of the charging voltage of the Capacitor 5 is ensured.

The tongue 19, which cooperates with the induction generator 12, is of low thickness, as shown in FIG. 2. This allows a positive pulse to be obtained which has a relatively short rise time as it is necessary for the thyristor 6 to work properly.

According to the modified embodiment of the tongue, like them 3, this forms a ramp 19a, which gradually decreases to the circumference of the hub 18 and has a radially oriented surface 19b in the direction of the rotation of this tongue.

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direction is shown by the arrow. Under these conditions the disturbance it causes in the magnetic flux is clearly recognizable, so that the formation of a well-marked signal is ensured is. In contrast, turning the tongue 19 in the opposite direction would only produce a gradual change in the flow, which would not be able to trigger the thyristor 6. Such a training of the tongue, which allows it, only in one direction of rotation is a simple and effective way to avoid starting the engine in the wrong direction. This risk can be given, for example, in boat engines that have a manually adjustable Have ignition timing.

It is very easy to place the housing of the induction generator 12 directly on the stator 13 of the magnetic flywheel at the point which is normally provided for the breaker in the magnetic flywheels of the usual type. This attachment is preferably so carried out that a radial displacement of the induction transmitter borrowed possible is to regulate the air gap 2o. On the stator 13 is the lighting coil, not shown, the armature with its coil 1, the supplies the charge voltage and the terminal block 26 is fastened.

As already mentioned, the connection terminal 27 can be any terminal block 26 (Fig. 2) can be grounded by a switch 28, preferably provided with a key, so that when the key is removed, the engine cannot be started.

According to the invention are the various elements of the device divided into three separate groups, which are demarcated by dash-dotted lines in FIG. 1 and denoted by A, B and C.

The first group A comprises the coil 1 and the encoder 12. These elements are in the magnetic flywheel, as described and in FIG. 2 shown, built-in.

009849/0754 ^ _{n nm}

The second group B (Fig. 5 and 6) consists of all electronic components of the system, namely the diodes 3 and 4, the Capacitor 5, the thyristor 6, the threshold diode 8 and the resistor 9, which are connected in a suitable manner via a plate 3o with printed circuits. For a more precise representation are with a, c and g in FIG. 5 the connection points to the anodes (a), to the cathodes (c) and to the grid (gates) g of the diodes and the thyristor designated. This entire unit is embedded in a mass of suitable synthetic resin and can practically form an absolutely watertight cylindrical block 31 of 22 mm in diameter and only 75 mm in length (Fig. 6 and 8), which can easily be attached to a suitable point on the motor gate with the help of clamps.

Finally, the third group C (FIG. 7) consists only of the High voltage ignition coil 7, which is itself in close proximity to the candle can be attached, or even connected directly to it, such as 8, which shows that the output wire of the coil feeds the plug directly, while the grounding is ensured by a shield 33 which surrounds the six faces of the spark plug and at the same time represents an interference shield.

The operation of the device described and illustrated is the following:

When the tongue 19 passes in front of the two cores 16a and 16b of the induction transmitter 12, the air gap 20 becomes smaller than the output air gap 21, and the magnetic flux flows through the tongue. if If this is removed, the entire flow again runs through the discharge air gap 21 and this change in flow induces the useful electromotive force.

The outflow air gap 21 is determined so that it meets the magnetic Flow distributed in different ways depending on the running speed.

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This is very important in order to achieve an outlet gas flow that is in Is regulated as a function of the rotational speed. Indeed, the magnetic resistance of the cores depends on the frequency and at high speed, more of the flow passes through the exhaust air gap.

When the signal or the pulse that comes from the induction generator 12 acts on the control electrode of the thyristor 6, it behaves this like a diode and the capacitor 5 discharges into the primary coil 7a of the high-voltage ignition coil 7. This becomes a self-capacitive one A resonant circuit is established, the resistance of which is negligible and in which the current is sinusoidal. The diodes 3 and 4 let through the negative half-period and the positive half-period the thyristor 6 runs through as long as it is ignited. In this way, several vibrations are achieved, each one of them Sparks correspond in the course of the same ignition. This damped oscillation phenomenon stops when the holding current in the thyristor is critical value reached.

Studies of the burns in the combustion chambers of the engines have shown that it is important on the one hand in order to achieve maximum energy yield and, on the other hand, to avoid sooting up the electrodes of the spark plugs, several To have vibrations, for example creating three sparks with each ignition. The precondition that such a train of sparks may be present, is that the duration of the pulse of the induction generator is greater than that of the spark train of the self-capacitance circuit depends and this at the highest speeds.

As shown in Fig. 8, the entire device, with the exception of the elements belonging to group A, which in the magnet flywheel is built in, with the ladders themselves one of a kind

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Block represent a prefabricated unit, which by being let into a Plastic of suitable elasticity is protected and at one of its ends with the help of, for example, eyelet lugs 32 with the three terminals of the connecting block 26 of the magnetic flywheel and connected at the other end to the spark plug 25 becomes, which can be done very easily and very quickly without a long search.

The device described and shown can of course also be used for the ignition of motors from a direct current source (accumulator battery or dynamo). For this purpose, the coil 1 of the alternator is replaced by a conventional type transistor converter. Otherwise needs nothing to be changed.

A unit, as described and illustrated here, can advantageously be used for each cylinder of a multi-cylinder engine β be provided so that the circulating distributor can be omitted.

The arrangement can be as follows:

1 l ^ ylinder two-stroke engine: | Unit with induction transmitter

changing, 2PoIe.

2 "cylinder two-stroke engine: 2 units with induction transmitter alternating, 4 poles.

3 »cylinder two-stroke engine j 3 units with induction transmitter alternating, 6 poles.

4 «cylinder four-stroke engine: 4 units with induction transmitter on of the camshaft, alternating · 4 poles

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176AA20

In the case «in which the motor to be equipped already has a low-voltage alternator (for example 12 volts) it is very easy, using a transformer, to obtain the voltage necessary for the functioning of the device to achieve the invention

Of course, there could be modified embodiments using equivalent elements and certain technological changes include, which are required in particular by the special features of the engines to be equipped, are produced, without departing from the scope of the invention.

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Claims (4)

PATBNTANWlIiTB 176AA20 DIPL. IN O. C. BTOBPBIi · DIPL. IN O. W. GOLLWITZBB · DIPL ·. IN O. MOLL LAXDAV / FtAtl AM M * If May 31, 1968 ath Patent an Sprüche 1 1.) Electronic ignition device with discharge capacitor for internal combustion engines, powered from an exchange electricity source and with one of one Induction transmitter controlled thyristor, whereby this transmitter takes the place of the usual interrupter «characterized» that instead a charge resistor for regulating the charge voltage, a choke (or regulator bridge) is provided which shorts the main winding of the coil of the alternating generator. 2.) Device according to claim 1, characterized in that it is -divided into three groups of elements, of which a) the first group from the Weoheeletromergenerator (the Magnetic flywheel), which carries the electromagnetic elements (magnets and flywheel solenoid coils, magnets and coils of the induction transmitter), b) the second group, the electronic elements, i.e. the thyristor, the three diodes, the polarization resistor and the capacitor, 0) the third group, the In the immediate vicinity of the Includes the transformer (the high voltage ignition coil) to be accommodated in the spark plug. 009849/0754 3.) Device according to tests 1 and 2, characterized in that the aweit and third Group with their ladders form a completely watertight single unit, which is covered by plastic wrapping and with the solenoid clamps on the magnetic housing one of their ends and with the ignition core through that other of their ends connected «is · 4.) Multi-cylinder engine with electronic ignition, characterized in that an independent and independent device according to the preceding claims provided for each individual cylinder is . ORIGINAL INSPECTED 009849/0754 Lee r side