DE1464052A1 - Contactless ignition arrangement for internal combustion engines - Google Patents

Description

PitenianwMte
Dfpl.-Ing. Γ. Beetz u.
DlpL-lng. Limpredit

81-10.85OP-DfH (6) I3.ll.i968

P 14 64 052.9
(H 56 999

New description
Contact loose ignition arrangement for internal combustion engines

The invention relates to a contactless ignition arrangement for internal combustion engines with an ignition coil, a high-frequency generator » whose output signal comes to act on the primary winding of the ignition coil, and one with the internal combustion engine circumferential. Slotted in adaptation to their ON rhythm Netall disk, which is the inductive coupling the secondary winding of the ignition coil to the output of the high-frequency generator interrupts and releases in the cycle of the speed of the internal combustion engine.

An ignition arrangement of this type is given in DAS 1 118 532 described. In this known ignition arrangement, the metal plate used to control the inductive coupling acts directly affects the interaction between the primary winding and the secondary winding of the ignition coil. This is how it works higher speeds only very imperfectly / precisely to determine the ignition point. The known ignition arrangement works namely in fact, that the high voltage required for ignition this creates the coupling between the primary winding and the secondary winding of the ignition coil in

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matching to the ignition tent 'is interrupted, whereby the oscillation frequency is simply determined in such a way that several high-voltage oscillations are required within the ignition time. This means, however, that there must be a strong mutual inductance between the primary winding and the secondary winding, which will be denoted by M in the following, in order to generate a high-frequency voltage with sufficient energy for ignition. Such a large mutual inductance M, however, in view of the fact that the voltage e induced on the secondary side is after the designation

d M i, “di. ,

German

calculated, In the 1 the current flowing in the primary coil referred to by the proportion of the second summand at high frequencies to changes in the Zundzeit, and also leaves the high voltage is not generated at the same moment in which the ignition time is reached.

From DAS 1 102 48} an ignition arrangement is also known, at egg the primary atrora of the ignition coil from a phototransistor is controlled by a fixed light source via one with a fixed ratio to the engine speed continuous aperture is illuminated. The practical use of this known ignition arrangement in motor vehicles has failed However, remember that there is no light source that can cope with the inevitable harsh conditions of such operation

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BATH ORIGINAL

U64052

Would have grown for a long time or the Ubar under longer tent under these conditions a sufficiently constant lighting could guarantee.

Based on this known prior art, the invention is therefore based on the object of an ignition arrangement to specify «the precise definition of the ignition point Guaranteed over long periods of operation.

This task is based on an ignition arrangement of the type mentioned at the outset, according to the invention, achieved by two separate induction coils lying opposite one another, between which the Netall disc rotates and of which the first is connected to the output of the high-frequency generator and the second via a pulse shaper stage and an amplifier old of the primary winding of the ignition coil is connected 1st.

With the arrangement according to the invention, the high-frequency vibrations! «^ the same way to generate a Control signal for a current flow through the primary winding The circuit controlling the ignition coil uses inductive coupling between the two separate induction coils can be small and therefore the ignition time remains independent from the rotational speed of the metal disk and thus from changes in the speed of the internal combustion engine - always constant. Accordingly, the ignition time is not influenced by changes in the mutual coupling the separate induction coils as a result of the rotary movement of the

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Metal disc, and in addition there are no deviations in the ignition tent depending on changes in the speed the internal combustion engine, so that it is possible to adjust the ignition point set with high accuracy and in this way to increase the performance of the internal combustion engine. Another Another advantage is that the energy to be transmitted from one induction coil to the other is only small, see above that the whole device for Peetleger the ignition point can be made compact and interchangeable, and finally the combination of the means leads to plague the ignition time with a semiconductor circuit for controlling the current flowing through the primary winding of the ignition coil to the possibility of generating the ignition high voltage with high accuracy at the ignition point.

An expedient embodiment of the invention is characterized by a with the high frequency generator and the Impulsforaerstufe connected voltage source, whose output signal depends in its amplitude on the speed of the internal combustion engine depends and determines the ignition point via the voltage induced in the second induction coil, it fell Design changes the voltage induced in the second induction coil when the engine speed increases automatically, which means that the ignition point is automatically brought forward.

Another development of the invention is characterized in that the slot width of the metal disc can be changed

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1st. A change in the width of the shiita leads to a change the voltage induced in the second induction coil and thus a control of the duration of the through the primary winding current flowing through the ignition coil.

To further explain the invention, the following an exemplary embodiment illustrated in the drawing described in more detail for an ignition arrangement according to the invention. Point at the same time

Pig. 1 is a block diagram for part of a

Invention genäfien ignition arrangement;

Figures 2 to 4 timing diagrams for various points the circuit according to Pig. I;

Fig. 5 * 6 and 7 a section through and two plan views on part of the circuit according to Flg. 1;

Fig. 8 in a pulse diagram showing the change in the

Signal voltage in the circuit shown in Fig. 1;

Flg. 9 a continuation to a differently trained rotating netall disk;

Flg.10 a blookshaltblld of an execution document for the entire ignition arrangement;

Flg. 11 is a circuit diagram of the arrangement according to FIG. 10;

Fig. 12 is a circuit diagram for another presentation phone the constant voltage source;

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Pig. 13 pulse diagrams for individual points of the Circuit according to Fig. 10.

Pig. 1 shows a for determining the ignition point «a serving device 1 and a high frequency generator 2, the frequency and amplitude of which is independent of the speed of the internal combustion engine are constant. The device 1 also contains a device connected to the output of the high-frequency generator 2 connected first induction coil 3 and a second induction coil 4. The voltage induced in the latter coil is amplified and used as an output signal.

The coils 3 and 4 are - as from Flg. 5 to 7 - opposite one another on an insulating support 5 arranged. Its rotating metal base 6 is arranged so that that they enter the area at certain time intervals swleohen engages the two coils.

The output of the «* used to determine the ignition point Device 1 is connected to a pulse shaper stage 7, and also device 1 and the pulse shaper ' stage 7 connected to a constant voltage source θ. That The output signal of the pulse shaping stage 7 is sent to an amplifier 9 which is connected to the primary winding 11 of an ignition coil 10 1st.

The pulse forme rat ufe 7 is used to set the output signal of the device 1 into a square pulse with a short rise time Reshape fall time; it consists of a Schmitt trigger or a monostable multivibrator.

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Dor V * r * t8rker 9 let a DC voltage amplifier or a koiideneator discharge amplifier in which the voltage an Itaforner »used to charge a capacitor and the electrical charge of the capacitor is used.

The details of the circuit of the invention Arrangement go out Pig. Il emerges.

The induction coil 3 of the high-frequency generator 2 has its one end over the collector-EMltter-Streoke (38c »-38e) of a transistor 38 to one pole A of a |

Olelo voltage source 12 and old their] other end over the Collector-EaUter-Streeke (13o, 1 »of a transistor 13 and a resistor 14 to the other pole B of this oil pressure source 12 connected. A resistor I5 and a capacitor l6 are parallel between the BmIs 13b of the Transistor 13 and one end of the coil 3. Between the Baltter 1 and the collector 130 of the transistor 13 also has a capacitor 17 * Zn in series with the resistor 15 there is a resistor 18 between the base 13b of the transistor I3 and the pole B of the voltage source 12

between one end of the coil 3 and the emitter 13e of the Transistor 13, a capacitor 19 is connected.

One end of the second coil 4 is connected to the base 20b of a transistor 20, while the other end of this Coil 4 via a resistor 21 and a parallel connected Capacitor 22 to pole B of the oil voltage source 12 connected 1st. The emitter 2Oe of transistor 20 is with

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connected to pole B, while the collector 2Oo dee transistor 20 Via a resistor 22 to which a capacitor 24 parallelized 1st, and the collector-smitter path of the transistor 38 to the pole A of the Oleiohspannungsquelle 12 is connected.

The pulse shaping stage 7, which converts the voltage induced in the coil 4 into rectangular mini-pulses, contains Transistors 25 and 26, the emitters 23e, 26e via a common resistor 27 are connected to the pole B of the voltage source. The base 25b of the transistor 25 is Connected to the collector 20b of the transistor 20 via a resistor 28, while the collector 25c via a Resistor 29 and the collector-emitter-Streoke of the transistor 38 is connected to pole A of the voltage source 12 is. The base 26b of the other transistor 26 is connected via a resistor 30 and a parallel-connected con «* Denaator 31 is connected to the collector 25o of the transistor 25 and is connected to pole B via a resistor 32 connected. The collector 26o is connected via a resistor 33 and the collector-emitter path of the transistor 36 connected to pole A.

The constant voltage source 8 contains a resistor 34, which is between the collector 38c of the transistor 38 and the pole B of the DC voltage source 12 is switched. the Base. 36b of transistor 36 is a tap of the resistor 34 connected. The emitter 36e of transistor 36 1st

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on the one hand via a »Zener diode 37 and the collector-emltter line of the transistor 38 to the pole A and on the other hand via a resistor 39 to the pole B of the calibration voltage ~ source 12, while the collector 360 of the transistor 36 is connected to the base 38b of the transistor 38 is.

The VeretMrlcer 9 contains a Zener diode 39 * the one hand to the output of circuit 7, i.e. to the collector of transistor 26 and, on the other hand, through a resistor is connected to the base 41b of a first transistor 41. The collector Mo of this transistor 41 is about a Resistor 42 connected to pole A of Olelohe voltage source 12. The base 43b of a second transistor 43 is with the emitter 4Ie of the transistor 41 of the previous stage and lugleloh over a resistor 44 to the pole B of the Olelohaparmungsquel Ie connected. The collector 43o of the transistor 43 is connected via a resistor 45 to the pole A of the electrical voltage source. The base 46b of a transistor 46, which is in series with the primary coil 11 of the ZUndspulenrichtung 10 is connected to the emitter 43e of the transistor 43 of the previous stage and via a resistor 47 connected to the pole B of the Oleiohspannungsquelle. Of the Collector 46c is across primary coil 11 and a resistor 48 connected to pole A. With one volume of the A secondary coil 49 of the ignition device 10 is connected to the primary coil 11 is at pole B.

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With this structure of the circuit, the coil 3 »the 1st connected to the output of the high frequency generator 2, a high frequency current with constant amplitude (Pig. 2) supplied. The result in the second coil 4 induced voltage is used as an output signal reinforced. The rotatable metal disk 6 crosses the space between the two coils JJ and 4 mounted on the insulating material carrier 5 at given by constant angles of rotation temporal intervals and thus shields the coil 4 from the high-frequency field generated by the coil 3 away. The disk 6 is located in that illustrated in FIG. 7 Angular position, a constant voltage is induced in the coil 4, the amplitude of which is determined by the shape and position of coils 3 and 4 are determined 1st. If the disc 6 arrives then in the in Flg. 6, the coil 4 is opposite to the high-frequency field generated by the coil 3 largely shielded, so that the coil 4 is induced Tension significantly reduced.

The voltage induced in the coil 4 is not like in the case of an alternator, the speed of the internal combustion engine is proportional »but is determined by the frequency of the High frequency generator 2 determined. Since its frequency has such a high and constant value that the maximum amplitude the induced voltage is not influenced by the speed of rotation of the disk «can be shown in FIG illustrated amplitude modulation of this voltage

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to take. By rectifying and amplifying this induced voltage, a result shown in Fig. 4 achieve signal voltage shown. This signal voltage is then fed to the pulse shaper stage 7 with the transistors 25 and 26, which brings the signal into a rectangular shape. The transistors 41 and 42 of the amplifier 9, like the transistor 46 in series with the primary winding 11 of the ignition coil 10, are controlled in such a way that the collector current of the tranaletor 46 and thus the current flowing through the primary winding 11 is periodically interrupted. In the secondary ignition 49 of the ignition coil 10, a high voltage is induced in each case, which triggers a discharge on the spark plug.

In the erfindungsgemäSen contactless ignition assembly that these HP-transmission at certain tent points rotatable by an inserted as a screen in the space between the two coils like disc is supported by the coil 3 on the opposite coil 4 hoohfrequenjbe electromagnetic energy transmission, wherein the Signalepannung is produced by is interrupted or at least largely reduced. The advantage here is that the ignition time is not significantly delayed and that the ignition of the internal combustion engine takes place in the stabilized state, after the voltage generated in the second coil 4 always generates a constant signal voltage without being influenced by the rotational speed of the disk 6.

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H64052

Instead of the constant voltage source 8 (according to FIG. 11), a constant voltage source shown in FIG. 12 can be used in order to present the ignition time electrically in accordance with the speed of the internal combustion engine. This is achieved by connecting the connections a ^! , b ^: and c 'with the terminals a, b and c (FIG. 11), while the terminals d ¹ , e ^f and f ^{1 are} connected to the terminals d, e and f. Here, the emitter 51e of a transistor 51 is connected to the collector 38c of the transistor 58, the collector 51c via a resistor 52 to the pole B of the DC voltage source. The base 51b is connected to the collector 26c of the transistor 26 (output of the circuit 7) and to a diode 54 via a resistor 53. One end of this diode 5 ^ is thus connected to the output of the pulse shaper stage 7, while the other end via a variable resistor

55 and the Baeie-Eraitter path (56b, 56e) of a transistor

56 is connected to pole B of the DC voltage source. The base 57b of the transistor 57 is through a resistor 58

* connected to the collector 51c of transistor 51 while

the emitter 57e directly to the pole B of the DC voltage source connected. The collector 57c is connected to the cathode of the diode 54 through a resistor 59 & n. Between the emitter 57e of the transistor 57 and the cathode of the diode 54 is a capacitor 60. The collector 560 of the Transistor 56 1st via a resistor 61 and the transistor transistor j $ 8 with the pole A of the direct voltage source as well as over

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H64052

a variable resistor 62 is connected to the base 63b of a transistor 63. Between the emitter 63e and the Collector 63c of transistor 63 is a Zener diode 37 The resistor 3 * is between the pole B of the voltage source and the collector 380 of the transistor 38; a tap Is connected to base 36b of transistor 36. The crease 36e of the transistor 36 is about the genainte Zener diode 37 with collector 380 of transistor 38 whose emitter is connected to pole A of the G calibration voltage source. The emitter 36e of the transistor "

36 is on the other hand via a resistor 39 to the pole B. connected to the Oleloh voltage source. The collector 360 of the Transistor 36 is connected to base 38b of transistor 38. The output of the pulse shaper stage 7 is immediate with the connection e *. connected «to that of the amplifier 9 is connected.

BiI of the circuit explained above is the output the Impulsforaeretufe 7 to the transistor 51 and the diode 5 * loaaen. If the primary current of the '

Ignition coil 10 is used by transistor 51 dasu, the capacitor 60 briefly via the transistor 57 and the polarity of the output signals of the pulse former stage 7 for the next Reverse loading perlode.

The capacitor is via the output of the pulse shaper stage 7 60 instantly charged * if through the diode 5 * «In Current flows to the primary winding 11 of the ignition coil 10 when

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-U-

The terminal voltage on capacitor 6o rises and the transistor 56 becomes conductive at a certain base potential, so occurs at the resistor 61 a voltage drop, so that a Basisstroni des through the variable resistor 62 Transistor 63 flows and transistor 63 becomes conductive. As a result, the Zener diode 37 is used as the reference voltage source for the constant voltage source 8 is short-circuited, with the result that the potential of the Wrinkle 36e of transistor 36 increases while the "collector current, i.e. the base current of transistor 38 decreases, which leads to a greater internal resistance and a greater voltage drop in transistor 38.

The pulse amplitude at the output of the pulse forming stage ve Prevents aioh depending on the speed of the internal combustion engine and is due to a change in electrical Charge of the capacitor 60 or a change in the Terminal voltage of this capacitor is shown. Is the Capacitor 60 is fully charged, so one for the operation of the for determining the ignition time ^ β serving direction of movement

required minimum voltage through the output voltage of the Constant voltage source 8 is determined, the speed of the Internal combustion engine is larger, the pulse amplitude increases The output of the pulse shaper stage 7 is smaller, the terminal voltage. of the capacitor 60 is reduced, the internal resistance of the Increased transistor 63, the potential of the cooler 36e of transistor 36 is reduced, the collector current is increased

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HB4052

and the internal resistance of the Trnaslstors 58 is reduced, so See a low output voltage of the constant voltage source θ yields.

The waveform of the output signals from device 1 therefore changes to that from Pig. 8 apparent way; such a change corresponds to bringing the ignition time forward. If, for example, the speed of the internal combustion engine increases from value nj to values ng and n, then the pulse aa becomes the output of the pulse shaper stage α

7 scheeler, so that the KleMaens voltage V, to the capacitor 60 and the output voltage V ^ of the constant voltage source 8 in the Pig. O apparent catfish change. The output voltage V _{1 of} the device 1 and the output signal V _{2 of} the Inpulsfonoerstufe 7 change accordingly. The ignition time of the primary current of the ignition coil 10 is shifted accordingly and can be brought forward in this way.

In the case of the arrangement according to the invention, the output signal the device used to set the ignition point by changing the inductively transmitted high-frequency energy Influenced by the constant voltage source, see their output signal according to the speed of the Internal combustion engine alleviates, so that also the output liipulse the Ioqpulsfomerstufe 7 influenced according to the speed will. These Iapulse are the ignition coil through an amplifier which controls the primary current. Since the ignition

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Time electrically automatic Depending on the Speed of the internal combustion engine is shifted, the drawbacks are avoided that arise with a mechanical ZUndpunktverstellung caused by friction and similar phenomena. The arrangement according to the invention is also distinguished characterized by a particularly quick response.

By changing the shape of the rotatable through the space between the two coils 3 and 4 Disc 6 (see. Fig. 9) you can see the time in which the electromagnetic field generated by the coil 5 compared to the second coil 4 is shielded, and in this way affect the angular range in which the primary winding 11 of the Ignition coil 10 is energized, change accordingly.

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Claims (2)

WpI.-Inc .: WpL-Ing. lampredit 4% 81-10.85OP * DfH (6) 15.II.I968 P U 6 * 052.9 (H 56 999 VHXo / * 6c5) New patent claims 1. Contactless * ignition arrangement for internal combustion engines with a Ignition coil, a high-frequency generator whose output signal can act on the primary winding of the ignition coil, and one rotating with the internal combustion engine in adaptation on their Zundrhythraue slotted metal disc, which the Inductive · Coupling of the secondary winding of the ignition coil with the output d «8 high-frequency generator in cycles of the speed the internal combustion engine interrupts and releases, marked duroh ^ two separate opposite one another Induction coils (3 and J)) between which the metal disc (6) and of which the first (3) is connected to the output of the high-frequency generator (2) and the second (%) via «Ine IapulBformerstufe (7) and an amplifier (9) with the primary winding (11) of the ignition coil (10) is connected. 2. Contact reading ignition arrangement according to Anspruoh 1, characterized by an old the high frequency generator (2) and the pulse formator (7) connected voltage source, its output signal its amplitude depends on the speed of the internal combustion engine and is induced via the In in the second induction coil (4) Voltage determines the ignition timing. 3- Contactless ignition arrangement according to claims 1 or 2 daduroh marked that the sole plate of the metal seal (6) is changeable. 009810/0538 Blank page