EP0848161B1 - Inductive ignition coils system for motor - Google Patents

Inductive ignition coils system for motor Download PDF

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Publication number
EP0848161B1
EP0848161B1 EP97117835A EP97117835A EP0848161B1 EP 0848161 B1 EP0848161 B1 EP 0848161B1 EP 97117835 A EP97117835 A EP 97117835A EP 97117835 A EP97117835 A EP 97117835A EP 0848161 B1 EP0848161 B1 EP 0848161B1
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EP
European Patent Office
Prior art keywords
ignition
inductive coil
ignition system
spark
coil
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EP97117835A
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German (de)
French (fr)
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EP0848161A3 (en
EP0848161A2 (en
Inventor
Ulrich Bentel
Helmut Schmied
Thomas Capouschek
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02PIGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P17/00Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
    • F02P17/12Testing characteristics of the spark, ignition voltage or current

Definitions

  • the invention relates to an inductive coil ignition system for an engine with at least one ignition coil, the one powered by a voltage source, primary winding having two connections and a secondary winding which also has two connections includes.
  • Inductive coil ignition systems for engines, in particular Automotive engines are well known.
  • Ignition coil used in such systems has one Primary winding on periodically with a primary current is applied. This current is used for Build up a magnetic field in the coil that acts as an energy store should serve. At the desired ignition point the primary current is interrupted. The in Magnetic field stored energy then ensures a steep rise in voltage on the secondary winding with the result of a flashover in the spark plug and a correspondingly steep rise of the secondary current. The one stored in the coil magnetic energy flows steadily as electrical Energy in the sparks.
  • the ion current measurement method Since the ion current measurement method has expired Requires ignition sparks, it is in the known Ignition systems where the secondary current is slow subsides, cannot be used. For example, to record the tendency of an engine to knock rather, other more complex measuring systems are necessary.
  • This patent describes an inductive coil ignition system for an engine, with at least one ignition coil one that is powered by a voltage source and has two connections Primary winding and a secondary winding, which also has two connections comprises, wherein the secondary winding with at least one spark plug is connected to a circuit device which is parallel to the primary winding is arranged and the two connections depending on a control signal connects the primary winding to end the spark, with a control circuit for generating the control signal and with one Ion current measuring device connected to the secondary winding, the ion current measuring device after the ignition spark has ended one over the spark plug flowing ion current after the ignition spark goes out.
  • the inductive coil ignition system with the features of claim 1 has the advantage that enables the use of an ion current measuring method, so that an affordable overall solution is achievable.
  • That parallel to the primary winding arranged switching element is about a control input from one in a special Control circuit generated control signal driven.
  • FIG. 1 shows an inductive coil ignition system 1, which is used to control a spark plug 3, the for example, assigned to a cylinder of a motor vehicle engine is.
  • Essential part of such Coil ignition system is a coil 5, the one Has primary winding 7 and a secondary winding 9.
  • a connection side 11 of the primary winding 7 is on the positive pole of a DC voltage source, preferably one battery connected, the other Terminal 13 to the collector of a transistor T2, whose emitter is grounded.
  • the transistor T2 is preferably a triple Darlington transistor.
  • the base of the transistor An ignition signal A is applied to T2.
  • Terminal 15 of the secondary winding 9 On the secondary side of the coil 5 is a first one Terminal 15 of the secondary winding 9 with one pole connected to the spark plug, the other pole of which is grounded lies.
  • the Anode is connected to ground.
  • a switching element is parallel to the primary winding 7 19, for example a thyristor, whose one terminal 21 with the terminal 13 and whose second connection 23 with the first connection 11 of the primary winding is connected.
  • a Control input 25 of the switching element 19 becomes a control signal supplied by a drive circuit 27 is generated.
  • the control circuit 27 is controlled via a control signal B.
  • An ion current measuring device 31 is assigned to the secondary side of the coil 5 and measures an ion current flowing over the candle after the ignition spark has gone out. On the basis of this measured value, it is possible to draw conclusions about the combustion process.
  • the ion current measuring device comprises a series circuit comprising a measuring resistor R M and a diode D2, the anode of this diode being connected to the resistor.
  • the other terminal of the measuring resistor R M is connected to a measuring voltage U M , while the cathode of the diode D2 is in electrical connection with the second terminal 17 of the secondary winding 9.
  • the voltage drop across the measuring resistor R M is fed to a measuring amplifier, preferably an operational amplifier, which generates a difference signal S and feeds it to an evaluation device.
  • a measuring amplifier preferably an operational amplifier
  • the ignition signal A is set to a voltage level "1" (for example 5 V) at a time t1, with the result that the transistor T2 becomes conductive.
  • a primary current I prim thus flows . of the battery voltage U asked via the primary winding 7 and the collector-emitter connection of the transistor 2 to ground. Due to the inductance of the coil 5, the current I prim increases. exponentially.
  • This primary current I prim serves to build up a magnetic field in the coil 5, which is to provide the energy necessary for the ignition.
  • the ignition signal A is set to the potential “0” (for example 0 V).
  • the transistor T2 falls back into the blocking state with the result that the primary current can no longer flow to ground. As can be clearly seen from the diagram, it falls back to the value 0.
  • the control signal B having a "1" level is set to a "0" level at a time t2.
  • the control circuit 27 thus switches the switching element 19 into the conductive state via the control input 25. This creates an electrical connection between the two terminals 11, 13 of the primary winding 7, so that a further reduction of the magnetic energy stored in the coil via the primary current I prim. he follows. In the diagram according to FIG. 2 it can be seen that the primary current I prim. has risen significantly at time t2 and slowly decays over time until the stored magnetic energy has dropped to the value 0.
  • the secondary current drops I sec. to the value 0.
  • a measuring voltage U M is switched on in the ion current measuring device, which generates a current flowing via the measuring resistor R M , the diode D2, the secondary winding 9 and the candle 3.
  • the level of this ion current depends in particular on the combustion conditions within the cylinder assigned to the candle 3.
  • the current value itself can be determined by tapping the voltage drop occurring at the measuring resistor R M.
  • Figure 3 shows an ignition system that consists of several Ignition coils is built. Such systems are used in multi-cylinder engines, whereby For example, an ignition coil is assigned to each cylinder is.
  • the ion current measuring device 31 is in each case with all connections 17 of the secondary windings 9 of the Coil ignition systems 1.1 to 1.3 connected so that structural savings have also been achieved here.
  • coil ignition systems can be build up more than those shown in Figure 3 have three individual coils.
  • the coils themselves can as single spark or double spark coils be trained.
  • the control circuit 27 comprises a transistor T1, the emitter of which is connected to ground.
  • the collector of the transistor T1 is connected to the battery voltage U bat via a parallel circuit comprising a resistor R1 and an RC element.
  • the RC element consists of a resistor R2 and a capacitor C1, one connection of the capacitor being connected to the collector.
  • the control signal to be supplied to the control connection 25 is tapped at a node 29 between the resistor R2 and the capacitor C1.
  • control circuit it is possible in the control circuit to provide a transistor for the switching element, the base of which is supplied with a control signal becomes.
  • the emitter of the transistor is grounded, while the collector is connected in parallel from a resistor and an RC element to the positive tension.
  • the control signal for the switching element is then at the connection node of resistor and capacitor of the RC element tapped.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein induktives Spulenzündsystem für einen Motor, mit zumindest einer Zündspule, die eine von einer Spannungsquelle gespeiste, zwei Anschlüsse aufweisende Primärwicklung und eine ebenfalls zwei Anschlüsse aufweisende Sekundärwicklung umfaßt.The invention relates to an inductive coil ignition system for an engine with at least one ignition coil, the one powered by a voltage source, primary winding having two connections and a secondary winding which also has two connections includes.

Induktive Spulenzündsysteme für Motoren, insbesondere Kfz-Motoren sind allgemein bekannt. Die in solchen Systemen eingesetzte Zündspule weist eine Primärwicklung auf, die periodisch mit einem Primärstrom beaufschlagt wird. Dieser Strom dient zum Aufbau eines Magnetfelds in der Spule, das als Energiespeicher dienen soll. Zum gewünschten Zündzeitpunkt wird der Primärstrom unterbrochen. Die im Magnetfeld gespeicherte Energie sorgt dann für einen steilen Anstieg der Spannung an der Sekundärwicklung mit dem Ergebnis eines Funkenüberschlags in der Zündkerze und einem entsprechend steilen Anstieg des Sekundärstroms. Die in der Spule gespeicherte magnetische Energie fließt stetig als elektrische Energie in den Funken ab.Inductive coil ignition systems for engines, in particular Automotive engines are well known. In the Ignition coil used in such systems has one Primary winding on periodically with a primary current is applied. This current is used for Build up a magnetic field in the coil that acts as an energy store should serve. At the desired ignition point the primary current is interrupted. The in Magnetic field stored energy then ensures a steep rise in voltage on the secondary winding with the result of a flashover in the spark plug and a correspondingly steep rise of the secondary current. The one stored in the coil magnetic energy flows steadily as electrical Energy in the sparks.

Bei modernen Zündsystemen besteht heutzutage die Forderung, möglichst genau verbrennungsspezifische Parameter zu messen und anhand dessen die Zündung zu optimieren. Ein aus dem Stand der Technik bekanntes Verfahren zur Ermittlung solcher Verbrennungsparameter ist in dem Ionenstrom-Meßverfahren zu sehen.With modern ignition systems there is nowadays Demand, combustion-specific as possible Measure parameters and based on this the ignition to optimize. A known from the prior art Method for determining such combustion parameters is in the ion current measurement process to see.

Da das Ionenstrom-Meßverfahren einen erloschenen Zündfunken erfordert, ist es bei den bekannten Zündsystemen, bei denen der Sekundärstrom langsam abklingt, nicht einsetzbar. Zur Erfassung beispielsweise der Klopfneigung eines Motors sind vielmehr andere aufwendigere Meßsysteme notwendig.Since the ion current measurement method has expired Requires ignition sparks, it is in the known Ignition systems where the secondary current is slow subsides, cannot be used. For example, to record the tendency of an engine to knock rather, other more complex measuring systems are necessary.

Ein solche Anordnung ist aus der DE 195 24 541 C bekannt Dieser Patentschrift beschreibt ein Induktives Spulenzündsystem für einen Motor, mit mindestens einer Zündspule, die eine von einer Spannungsquelle gespeiste, zwei Anschlüsse aufweisende Primärwicklung und eine ebenfalls zwei Anschlüsse aufweisende Sekundärwicklung umfasst, wobei die Sekundärwicklung mit mindestens einer Zündkerze verbunden ist, mit einer Schaltungsvorrichtung die parallel zur Primärwicklung angeordnet ist und abhängig von einem Steuersignal die beiden Anschlüsse der Primärwicklung zur Beendigung des Zündfunkens miteinander verbindet, mit einer Ansteuerschaltung zur Erzeugung des Steuersignals und mit einer Ionenstrom-Messvorrichtung, die an der Sekundärwicklung angeschlossen ist, wobei die Ionenstrom-Messvorrichtung nach Beendigung des Zündfunkens einen über die Zündkerze fließenden Ionenstrom nach Erlöschen des Zündfunkens misst.Such an arrangement is known from DE 195 24 541 C. This patent describes an inductive coil ignition system for an engine, with at least one ignition coil one that is powered by a voltage source and has two connections Primary winding and a secondary winding, which also has two connections comprises, wherein the secondary winding with at least one spark plug is connected to a circuit device which is parallel to the primary winding is arranged and the two connections depending on a control signal connects the primary winding to end the spark, with a control circuit for generating the control signal and with one Ion current measuring device connected to the secondary winding, the ion current measuring device after the ignition spark has ended one over the spark plug flowing ion current after the ignition spark goes out.

Vorteile der ErfindungAdvantages of the invention

Das induktive Spulenzündsystem mit den Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß es den Einsatz eines Ionenstrom-Meßverfahrens ermöglicht, so daß eine kostengünstige Gesamtlösung erreichbar ist. Dadurch, daß eine parallel zur Primärwicklung angeordnete Schaltvorrichtung zu einem vorbestimmbaren Zeitpunkt die beiden Anschlüsse der Primärwicklung elektrisch verbindet, wird die magnetische Energie in der Spule über die Primärwicklung abgebaut, so daß der Sekundärstrom abrupt abfällt. Bedingt durch diesen Stromabfall erlischt der Zündfunke, so daß unmittelbar danach eine Ionenstrom-Messung möglich ist. Das parallel zur Primärwicklung angeordnete Schaltelement wird über einen Steuereingang von einem in einer speziellen Ansteuerschaltung erzeugten Steuersignal angesteuert.The inductive coil ignition system with the features of claim 1 has the advantage that enables the use of an ion current measuring method, so that an affordable overall solution is achievable. The fact that a parallel to the primary winding arranged switching device to one predeterminable time the two connections of the Primary winding electrically connects, the magnetic Energy in the coil through the primary winding degraded so that the secondary current drops abruptly. Due to this drop in power goes out the spark, so that immediately afterwards an ion current measurement is possible. That parallel to the primary winding arranged switching element is about a control input from one in a special Control circuit generated control signal driven.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den übrigen Unteransprüchen.Further advantageous embodiments of the invention result from the other subclaims.

Zeichnungendrawings

Die Erfindung wird nun anhand von Ausführungsbeispielen mit Bezug auf die Zeichnungen näher beschrieben. Dabei zeigen:

Figur 1
ein Schaltbild eines induktiven Spulen zündsystems mit einer Ionenstrom-Meßvorrichtung;
Figur 2
ein Diagramm der Spannungs- und Stromverläufe, und
Figur 3
ein zweites Ausführungsbeispiel eines induktiven Spulenzündsystems.
The invention will now be described in more detail using exemplary embodiments with reference to the drawings. Show:
Figure 1
a circuit diagram of an inductive coil ignition system with an ion current measuring device;
Figure 2
a diagram of the voltage and current curves, and
Figure 3
a second embodiment of an inductive coil ignition system.

Ausführungsbeispieleembodiments

Figur 1 zeigt ein induktives Spulenzündsystem 1, das zur Ansteuerung einer Zündkerze 3 dient, die beispielsweise einem Zylinder eines Kfz-Motors zugeordnet ist. Wesentlicher Bestandteil eines solchen Spulenzündsystems ist eine Spule 5, die eine Primärwicklung 7 und eine Sekundärwicklung 9 aufweist. Eine Anschlußseite 11 der Primärwicklung 7 ist an den Pluspol einer Gleichspannungsquelle, vorzugsweise einer Batterie angeschlossen, der andere Anschluß 13 an den Kollektor eines Transistors T2, dessen Emitter an Masse liegt. Bei dem Transistor T2 handelt es sich vorzugsweise um einen 3-fach-Darlington-Transistor. Die Basis des Transistors T2 wird mit einem Zündsignal A beaufschlagt.FIG. 1 shows an inductive coil ignition system 1, which is used to control a spark plug 3, the for example, assigned to a cylinder of a motor vehicle engine is. Essential part of such Coil ignition system is a coil 5, the one Has primary winding 7 and a secondary winding 9. A connection side 11 of the primary winding 7 is on the positive pole of a DC voltage source, preferably one battery connected, the other Terminal 13 to the collector of a transistor T2, whose emitter is grounded. The transistor T2 is preferably a triple Darlington transistor. The base of the transistor An ignition signal A is applied to T2.

Auf der Sekundärseite der Spule 5 ist ein erster Anschluß 15 der Sekundärwicklung 9 mit einem Pol der Zündkerze verbunden, deren anderer Pol an Masse liegt.On the secondary side of the coil 5 is a first one Terminal 15 of the secondary winding 9 with one pole connected to the spark plug, the other pole of which is grounded lies.

An den zweiten Anschluß 17 der Sekundärwicklung 9 ist eine Kathode einer Diode D1 angeschlossen, deren Anode mit Masse verbunden ist.To the second connection 17 of the secondary winding 9 is connected to a cathode of a diode D1, the Anode is connected to ground.

Parallel zu der Primärwicklung 7 ist ein Schaltelement 19, beispielsweise ein Thyristor vorgesehen, dessen einer Anschluß 21 mit dem Anschluß 13 und dessen zweiter Anschluß 23 mit dem ersten Anschluß 11 der Primärwicklung verbunden ist. Einem Steuereingang 25 des Schaltelements 19 wird ein Ansteuersignal zugeführt, das von einer Ansteuerschaltung 27 erzeugt wird.A switching element is parallel to the primary winding 7 19, for example a thyristor, whose one terminal 21 with the terminal 13 and whose second connection 23 with the first connection 11 of the primary winding is connected. a Control input 25 of the switching element 19 becomes a control signal supplied by a drive circuit 27 is generated.

Die Steuerung der Ansteuerschaltung 27 erfolgt über ein Steuersignal B.The control circuit 27 is controlled via a control signal B.

Der Sekundärseite der Spule 5 ist eine Ionenstrom-Meßvorrichtung 31 zugeordnet, die einen über die Kerze fließenden Ionenstrom nach Erlöschen des Zündfunkens mißt. Anhand dieses Meßwerts ist es möglich, Rückschlüsse auf den Ablauf der Verbrennung zu ziehen. Die Ionenstrom-Meßvorrichtung umfaßt eine Reihenschaltung aus einem Meßwiderstand RM und einer Diode D2, wobei die Anode dieser Diode mit dem Widerstand verbunden ist. Der andere Anschluß des Meßwiderstands RM ist an eine Meßspannung UM angeschlossen, während die Kathode der Diode D2 mit dem zweiten Anschluß 17 der Sekundärwicklung 9 in elektrischer Verbindung steht. Die an dem Meßwiderstand RM abfallende Spannung wird einem Meßverstärker, vorzugsweise einem Operationsverstärker zugeführt, der ein Differenzsignal S erzeugt und einer Auswerteeinrichtung zuführt. Für den Einsatz der Ionenstrom-Meßvorrichtung ist es wichtig, daß der durch das Magnetfeld der Spule erzeugte Sekundärstrom auf Null abgesunken und damit der Zündfunken erloschen ist. Solange ein Zündfunken existiert, ist eine Ionenstrom-Messung nicht möglich.An ion current measuring device 31 is assigned to the secondary side of the coil 5 and measures an ion current flowing over the candle after the ignition spark has gone out. On the basis of this measured value, it is possible to draw conclusions about the combustion process. The ion current measuring device comprises a series circuit comprising a measuring resistor R M and a diode D2, the anode of this diode being connected to the resistor. The other terminal of the measuring resistor R M is connected to a measuring voltage U M , while the cathode of the diode D2 is in electrical connection with the second terminal 17 of the secondary winding 9. The voltage drop across the measuring resistor R M is fed to a measuring amplifier, preferably an operational amplifier, which generates a difference signal S and feeds it to an evaluation device. For the use of the ion current measuring device, it is important that the secondary current generated by the magnetic field of the coil has dropped to zero and the ignition spark has therefore gone out. As long as an ignition spark exists, an ion current measurement is not possible.

Anhand der Spannungs- und Stromdiagramme in Figur 2 soll nun die Funktion des induktiven Spulenzündsystems 1 erläutert werden.Using the voltage and current diagrams in Figure 2 now the function of the inductive coil ignition system 1 are explained.

Wie bei den aus dem Stand der Technik bekannten induktiven Spulenzündsystemen wird das Zündsignal A zu einem Zeitpunkt t1 auf einen Spannungspegel "1" (beispielsweise 5 V) gesetzt, mit der Folge, daß der Transistor T2 leitend wird. Damit fließt ein Primärstrom Iprim. von der Batteriespannung Ubat über die Primärwicklung 7 und die Kollektor-Emitter-Verbindung des Transistors 2 zur Masse. Aufgrund der Induktivität der Spule 5 steigt der Strom Iprim. exponentiell an. Dieser Primärstrom Iprim. dient dazu, ein magnetisches Feld in der Spule 5 aufzubauen, das die für die Zündung notwendige Energie liefern soll. Zu einem gewünschten Zündzeitpunkt tZ wird das Zündsignal A auf das Potential "0" (beispielsweise 0 V) gesetzt. Der Transistor T2 fällt zurück in den sperrenden Zustand mit der Folge, daß der Primärstrom nicht mehr zur Masse abfließen kann. Wie aus dem Diagramm deutlich zu erkennen, fällt er auf den Wert 0 zurück.As with the inductive coil ignition systems known from the prior art, the ignition signal A is set to a voltage level "1" (for example 5 V) at a time t1, with the result that the transistor T2 becomes conductive. A primary current I prim thus flows . of the battery voltage U asked via the primary winding 7 and the collector-emitter connection of the transistor 2 to ground. Due to the inductance of the coil 5, the current I prim increases. exponentially. This primary current I prim. serves to build up a magnetic field in the coil 5, which is to provide the energy necessary for the ignition. At a desired ignition point in time t Z , the ignition signal A is set to the potential “0” (for example 0 V). The transistor T2 falls back into the blocking state with the result that the primary current can no longer flow to ground. As can be clearly seen from the diagram, it falls back to the value 0.

Dieser Stromabfall in der Primärwicklung führt zu einer Induktion einer sehr großen Spannung in der Sekundärwicklung 9. Sobald die Spannung ausreichend groß ist, entsteht ein Zündfunke in der Zündkerze 3 bei gleichzeitigem steilen Anstieg des Sekundärstroms Isek., wie in Figur 2 zu erkennen. Die in der Spule gespeicherte magnetische Energie wird nun in elektrische Energie umgewandelt, so daß weiterhin ein Sekundärstrom über die Kerze zur Masse fließt, wobei der Stromwert über der Zeit abnimmt.This drop in current in the primary winding leads to the induction of a very large voltage in the secondary winding 9. As soon as the voltage is sufficiently high, an ignition spark arises in the spark plug 3 with a simultaneous steep rise in the secondary current I sec. , as can be seen in Figure 2. The magnetic energy stored in the coil is now converted into electrical energy, so that a secondary current continues to flow through the candle to the ground, the current value decreasing over time.

Nach einer definierbaren Zeitdauer tFunke wird zu einem Zeitpunkt t2 das einen "1" Pegel aufweisende Steuersignal B auf einen "0" Pegel gesetzt. Damit wird von der Ansteuerschaltung 27 das Schaltelement 19 über den Steuereingang 25 in den leitenden Zustand geschaltet. Damit wird eine elektrische Verbindung zwischen den beiden Anschlüssen 11, 13 der Primärwicklung 7 geschaffen, so daß ein weiterer Abbau der in der Spule gespeicherten magnetischen Energie über den Primärstrom Iprim. erfolgt. Im Diagramm gemäß Figur 2 ist zu erkennen, daß der Primärstrom Iprim. zum Zeitpunkt t2 deutlich angestiegen ist und langsam über die Zeit abklingt, bis die gespeicherte magnetische Energie auf den Wert 0 abgesunken ist.After a definable period of time t spark , the control signal B having a "1" level is set to a "0" level at a time t2. The control circuit 27 thus switches the switching element 19 into the conductive state via the control input 25. This creates an electrical connection between the two terminals 11, 13 of the primary winding 7, so that a further reduction of the magnetic energy stored in the coil via the primary current I prim. he follows. In the diagram according to FIG. 2 it can be seen that the primary current I prim. has risen significantly at time t2 and slowly decays over time until the stored magnetic energy has dropped to the value 0.

Gleichzeitig mit dem Fließen eines Primärstroms Iprim. zum Zeitpunkt t2 fällt der Sekundärstrom Isek. auf den Wert 0 ab.Simultaneously with the flow of a primary current I prim. at time t2, the secondary current drops I sec. to the value 0.

Es ergibt sich also, daß bereits nach einer kurzen Zeitdauer tfunke der Sekundärstrom auf 0 abgesunken und damit eine Ionenstrom-Messung möglich ist. Hierzu wird kurz nach dem Zeitpunkt t2 eine Meßspannung UM in der Ionenstrom-Meßvorrichtung eingeschaltet, die einen über den Meßwiderstand RM, die Diode D2, die Sekundärwicklung 9 und die Kerze 3 fließenden Strom erzeugt. Die Höhe dieses Ionenstroms hängt insbesondere von den Verbrennungsverhältnissen innerhalb des der Kerze 3 zugeordneten Zylinders ab. Der Stromwert selbst läßt sich durch Abgreifen des an dem Meßwiderstand RM entstehenden Spannungsabfalls bestimmen.It follows that after a short period of time t spark the secondary current has dropped to 0 and an ion current measurement is thus possible. For this purpose, shortly after the time t2, a measuring voltage U M is switched on in the ion current measuring device, which generates a current flowing via the measuring resistor R M , the diode D2, the secondary winding 9 and the candle 3. The level of this ion current depends in particular on the combustion conditions within the cylinder assigned to the candle 3. The current value itself can be determined by tapping the voltage drop occurring at the measuring resistor R M.

Anhand des gemessenen Ionenstroms läßt sich beispielsweise beurteilen, ob die Verbrennung zu früh stattgefunden hat mit der sich daraus ergebenden Gefahr des Klopfens. Ebenfalls ist es möglich, festzustellen, ob überhaupt eine Verbrennung stattgefunden hat. Die gemessenen Werte fließen dann beispielsweise in die Neubestimmung der Zündwinkel und die Diagnose des Zündsystems ein.Based on the measured ion current, for example assess whether the combustion is too early took place with the resulting Risk of knocking. It is also possible determine if there was any combustion Has. The measured values then flow for example in redefining the ignition angle and the diagnosis of the ignition system.

Figur 3 läßt ein Zündsystem erkennen, das aus mehreren Zündspulen aufgebaut ist. Derartige Systeme werden in mehrzylindrigen Motoren eingesetzt, wobei beispielsweise jedem Zylinder eine Zündspule zugeordnet ist.Figure 3 shows an ignition system that consists of several Ignition coils is built. Such systems are used in multi-cylinder engines, whereby For example, an ignition coil is assigned to each cylinder is.

Die gestrichelt umrandeten Einzelsysteme 1.1, 1.2 und 1.3 entsprechen in ihrem Aufbau und ihrer Funktionsweise dem Zündsystem gemäß Figur 1, weshalb auf eine nochmalige Beschreibung der mit gleichen Bezugszeichen gekennzeichneten Teile verzichtet wird.The individual systems 1.1, 1.2 outlined in dashed lines and 1.3 correspond in their structure and functioning the ignition system according to Figure 1, which is why on a repeated description of the same Parts marked with the reference numerals are dispensed with becomes.

Von Bedeutung ist jedoch, daß für die in Figur 3 gezeigten drei Zündspulensysteme 1.1 bis 1.3 lediglich eine Ansteuerschaltung 27 mit einem Schaltelement 19 und eine Ionenstrom-Meßvorrichtung 31 vorgesehen sind. Die Anschlüsse 13 der drei Spulen 5 sind über jeweils eine Diode 35 mit dem Anschluß 21 des Schaltelements verbunden, wobei jeweils die Anode einer Diode 35 am Anschluß 13 liegt. Diese Verschaltung ermöglicht eine sehr kostengünstige Realisierung eines induktiven Spulenzündsystems auch bei mehrzylindrigen Motoren, da nur ein Schaltelement und eine Ansteuerschaltung 27 notwendig sind.It is important, however, that for the in FIG shown three ignition coil systems 1.1 to 1.3 only a control circuit 27 with a switching element 19 and an ion current measuring device 31 are provided are. The connections 13 of the three coils 5 are connected via a diode 35 to the terminal 21 connected to the switching element, the anode a diode 35 is at the terminal 13. This interconnection enables a very cost-effective implementation an inductive coil ignition system too in multi-cylinder engines, since only one switching element and a control circuit 27 are necessary.

Die Ionenstrom-Meßvorrichtung 31 ist jeweils mit allen Anschlüssen 17 der Sekundärwicklungen 9 der Spulenzündsysteme 1.1 bis 1.3 verbunden, so daß auch hier bauliche Einsparungen realisiert sind.The ion current measuring device 31 is in each case with all connections 17 of the secondary windings 9 of the Coil ignition systems 1.1 to 1.3 connected so that structural savings have also been achieved here.

Selbstverständlich lassen sich Spulenzündsysteme aufbauen, die mehr als die in Figur 3 gezeigten drei Einzelspulen aufweisen. Die Spulen selbst können als Einzelfunken- oder als Doppelfunkenspulen ausgebildet sein. Of course, coil ignition systems can be build up more than those shown in Figure 3 have three individual coils. The coils themselves can as single spark or double spark coils be trained.

Bei der schaltungstechnischen Realisierung ist es möglich, als Schaltelement einen IGBT (insulated gate bipolar transistor) oder einen Thyristor zu verwenden, dessen Ermitter beziehungsweise Kathode an einer mit einer positiven Spannung beaufschlagten Anschlußseite der Primärwicklung und der Kollektor beziehungsweise die Anode an der anderen Anschlußseite der Primärwicklung angeschlossen ist. Der Steuereingang des IGBT's beziehungsweise des Thyristors wird mit einem Ansteuersignal beaufschlagt, das von einer Ansteuerschaltung geliefert wird. Die Verwendung eines Thyristors als Schaltelement ermöglicht einen einfachen und kostengünstigen Aufbau. Bei einer solchen schaltungstechnischen Realisierung umfaßt die Ansteuerschaltung 27 einen Transistor T1, dessen Emitter mit Masse verbunden ist. Der Kollektor des Transistors T1 ist über eine Parallelschaltung aus einem Widerstand R1 und einem RC-Glied mit der Batteriespannung Ubat verbunden. Das RC-Glied besteht aus einem Widerstand R2 und einem Kondensator C1, wobei ein Anschluß des Kondensators mit dem Kollektor verbunden ist. Das dem Steueranschluß 25 zuzuführende Steuersignal wird an einem Knoten 29 zwischen Widerstand R2 und Kondensator C1 abgegriffen.In the implementation in terms of circuit technology, it is possible to use an IGBT (insulated gate bipolar transistor) or a thyristor as the switching element, the emitter or cathode of which is connected to a connection side of the primary winding to which a positive voltage is applied, and the collector or the anode to the other connection side of the primary winding connected. The control input of the IGBT or the thyristor is acted upon by a drive signal which is supplied by a drive circuit. The use of a thyristor as a switching element enables a simple and inexpensive construction. In such an implementation in terms of circuitry, the control circuit 27 comprises a transistor T1, the emitter of which is connected to ground. The collector of the transistor T1 is connected to the battery voltage U bat via a parallel circuit comprising a resistor R1 and an RC element. The RC element consists of a resistor R2 and a capacitor C1, one connection of the capacitor being connected to the collector. The control signal to be supplied to the control connection 25 is tapped at a node 29 between the resistor R2 and the capacitor C1.

Letztendlich ist es möglich, in der Ansteuerschaltung für das Schaltelement einen Transistor vorzusehen, dessen Basis ein Steuersignal zugeführt wird. Der Emitter des Transistors ist an Masse gelegt, während der Kollektor über eine Parallelschaltung aus einem Widerstand und einem RC-Glied an die positive Spannung gelegt ist. Das Ansteuersignal für das Schaltelement wird dann am Verbindungsknoten von Widerstand und Kondensator des RC-Glieds abgegriffen.Ultimately, it is possible in the control circuit to provide a transistor for the switching element, the base of which is supplied with a control signal becomes. The emitter of the transistor is grounded, while the collector is connected in parallel from a resistor and an RC element to the positive tension. The control signal for the switching element is then at the connection node of resistor and capacitor of the RC element tapped.

Claims (9)

  1. Inductive coil ignition system for an engine, having at least one ignition coil, which comprises a primary winding (which is fed from a voltage source and has two connections) and a secondary winding (which likewise has two connections), with the secondary winding (9) being connected to at least one spark plug (3), having a switching apparatus (19) which is arranged in parallel with the primary winding (7) and connects the two connections (11, 13) of the primary winding (7) to one another in order to end the ignition spark as a function of a control signal, having a drive circuit (27) for producing the control signal and having an ion-current measurement apparatus (31) which is connected to the secondary winding (9), with the ion-current measurement apparatus (31) applying a measurement voltage UM to the secondary winding (9) after the end of the ignition spark, and measuring any ion current which flows via the spark plug (3) after quenching of the ignition spark.
  2. Inductive coil ignition system according to Claim 1, characterized in that the drive circuit (27) produces the drive signal which is required for the switching apparatus (19) and has a control input (B) via which the drive circuit (27) is triggered.
  3. Inductive coil ignition system according to one of the preceding claims, characterized in that the primary winding (7) can be connected to the voltage source (UBAT) via a Darlington transistor (T2).
  4. Inductive coil ignition system according to one of the preceding claims, characterized in that one connection of the secondary winding (9) is connected via the spark plug (3) to earth, and a second connection (17) is connected to earth via a diode (D1).
  5. Inductive coil ignition system according to Claim 4, characterized in that the ion-current measurement apparatus (31) has a series circuit formed by a diode (D2) and a current measurement resistor (RM), one of whose ends is connected to the secondary winding, while its other end is connected to a measurement voltage (UM).
  6. Inductive coil ignition system according to Claim 5, characterized in that a voltage which is dropped across the measurement resistor (RM) can be tapped off by a measurement amplifier.
  7. Inductive coil ignition system according to one of the preceding claims, characterized in that an appropriate number of ignition coils (5) are provided for a multicylinder engine, and in that the switching apparatus (19) is associated with all the ignition coils (5).
  8. Inductive coil ignition system according to Claim 7, characterized in that the second connection (13) of each primary winding (7) is connected via a diode (35) to the connection (21) of the switching element (19).
  9. Inductive coil ignition system according to one of the preceding claims, characterized in that the ignition coil (5) is in the form of a single-spark coil or a double-spark coil.
EP97117835A 1996-12-16 1997-10-15 Inductive ignition coils system for motor Expired - Lifetime EP0848161B1 (en)

Applications Claiming Priority (2)

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DE19652267A DE19652267A1 (en) 1996-12-16 1996-12-16 Inductive coil ignition system for an engine
DE19652267 1996-12-16

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EP0848161A2 EP0848161A2 (en) 1998-06-17
EP0848161A3 EP0848161A3 (en) 1999-12-08
EP0848161B1 true EP0848161B1 (en) 2003-06-11

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EP97117835A Expired - Lifetime EP0848161B1 (en) 1996-12-16 1997-10-15 Inductive ignition coils system for motor

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EP (1) EP0848161B1 (en)
DE (2) DE19652267A1 (en)

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DE59710262D1 (en) 2003-07-17
EP0848161A3 (en) 1999-12-08
US5970965A (en) 1999-10-26
DE19652267A1 (en) 1998-06-18
EP0848161A2 (en) 1998-06-17

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