EP2547897A1 - Ignition method and ignition system therefor - Google Patents

Ignition method and ignition system therefor

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Publication number
EP2547897A1
EP2547897A1 EP11715394A EP11715394A EP2547897A1 EP 2547897 A1 EP2547897 A1 EP 2547897A1 EP 11715394 A EP11715394 A EP 11715394A EP 11715394 A EP11715394 A EP 11715394A EP 2547897 A1 EP2547897 A1 EP 2547897A1
Authority
EP
European Patent Office
Prior art keywords
current
ignition
primary
circuit
spark plug
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11715394A
Other languages
German (de)
French (fr)
Other versions
EP2547897B1 (en
Inventor
André BRANDES
Rainer VÖLZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motortech GmbH
Original Assignee
Motortech GmbH
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Filing date
Publication date
Application filed by Motortech GmbH filed Critical Motortech GmbH
Publication of EP2547897A1 publication Critical patent/EP2547897A1/en
Application granted granted Critical
Publication of EP2547897B1 publication Critical patent/EP2547897B1/en
Active legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
    • F02P17/12—Testing characteristics of the spark, ignition voltage or current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • F02P15/10—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits having continuous electric sparks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • F02P3/04—Layout of circuits
    • F02P3/05—Layout of circuits for control of the magnitude of the current in the ignition coil
    • F02P3/051—Opening or closing the primary coil circuit with semiconductor devices
    • F02P3/053—Opening or closing the primary coil circuit with semiconductor devices using digital techniques

Definitions

  • the invention relates to an ignition method for internal combustion engines with an ignition coil with primary circuit and secondary circuit and a in
  • Pulse signal is controlled by pulse width modulation in the primary circuit. Furthermore, the invention relates to an ignition system for internal combustion engines with a control unit for specifying a drive signal, a burning time and an ignition current, an electronic switch for generating a
  • Pulse signals an ignition coil with primary and secondary windings, wherein the primary winding via the electronic switch to a voltage source and the secondary winding supplies a spark plug.
  • an ignition system for igniting the fuel-air mixture in the combustion chamber by means of a spark is required.
  • an electronic ignition system is used with an ignition coil as energy storage.
  • a situation-appropriate adjustment of the ignition energy required for each ignition process is of crucial importance.
  • EP 1 103 720 B1 discloses a method and device for controlling the current of an ignition system for an internal combustion engine, in which electrical energy is generated in a magnetic field that has been established by a primary current. stored and interrupted by interrupting the primary current, the magnetic field and generates a high voltage by induction, which is used for ignition, wherein a control signal is a target value for the
  • Flyback converter operates and receives the signal of a secondary-side ion current measurement as actual size.
  • the pulse train ignition is known, which is similar to the pulse width modulated ignition control, but a conscious
  • the third electronic ignition system is a
  • AC ignition known in which the primary circuit of the ignition coil is supplied with an AC voltage.
  • a formed from ignition coil and capacitor resonant circuit is driven, so at the output there is a high voltage with alternating polarity and accordingly matched spark plugs must be used.
  • the object of the invention is to provide an ignition system or an ignition method, with which a safe triggering of a spark with control of the ignition process over the entire firing period is provided, with excessive use of the ignition coil and spark plug is to be avoided.
  • the basic idea is that the ignition coil as
  • the state of the secondary circuit can be reliably detected.
  • the ignition current is readjusted immediately via the control loop in order to avoid spark arrest.
  • This ignition current control thus automatically reacts to sources of error on the secondary current side.
  • Each cylinder or each spark plug thus the individually optimal ignition current is supplied.
  • the ignition coil acts in Operation as a forward converter.
  • the adjustment of the ignition current to the desired current is carried out by pulse width modulation or frequency modulation or pulse width and frequency modulation. In a frequency modulation special characteristics of the respective ignition coil and other parameters of the control behavior can be considered.
  • Freewheeling current can be added to a total current and the total current is compared with the predetermined Sollzündstrom can be used by detecting the freewheeling current of the control loop for multiple Zündspul- / spark plug systems for multi-cylinder internal combustion engines.
  • a primary current measurement is carried out before the distribution of the primary current to the respective ignition coils assigned to the cylinders or spark plugs, ie before the electronic switches which are arranged parallel to one another.
  • the maximum energy can be chosen so that the usual wear, especially on the spark plug within a tolerance range, by the maximum energy is given, are covered. If, however, significant errors in
  • the control unit controls the secondary current correction means and also selects the slope of the ramp. The steepness of the ramp can vary depending on
  • Ignition coil type can be specified differently. Depending on the respectively connected ignition coil type, the correct ramp can then be selected via the configuration of the control unit. In the secondary flow means, the ramp is generated so that it runs during the burning time of the spark plug and prevents the rise of the ramp signal, the otherwise resulting secondary current drop.
  • the charging process of the ignition coil is carried out with a fixed charge current, after which the ignition current control takes place only after the flashover.
  • the pulse signal has a fixed or regulated switching frequency of 50 kHz and higher, in particular 50 kHz to 100 kHz, a very straightforward ignition current profile can be achieved despite the regulation, which avoids current peaks.
  • the known with pulse width modulated ignition control Ripplestrom is avoided.
  • Fig. 2 in two graphs the course of control and current signals in the ignition system according to the invention.
  • Fig. 3 is a switching principle of a simplified embodiment of the invention.
  • FIG. 4 shows a switching principle according to FIG. 1 with secondary current correction.
  • a basic circuit of the ignition system according to the invention is shown.
  • the circuit has a control unit 1, which is for example a CPU, in which the parameters for the operation of the ignition system and its software is stored.
  • these are the specification of a drive signal, the specification of a burning time and the specification of the ignition current.
  • the initial ignition current with charging duration is predetermined via the control unit 1.
  • the circuit has an electronic switch 2 in a primary circuit P powered by a voltage source 4.
  • the primary circuit P leads via a primary winding 31 of the ignition coil 3
  • Primary circuit P a parallel to the primary winding 31 of the ignition coil 3 connected freewheeling diode 33 is arranged.
  • a first current measuring means 61 is provided for determining the instantaneously flowing primary current.
  • a second current measuring means 62 for measuring the first current measuring means 61 in the parallel to the primary winding 31 line with the Freewheeling diode 33.
  • the ignition coil 3 has, in addition to the primary winding 31, a secondary winding 32 (high-voltage part), which together with a spark plug 5 a
  • the two measuring signals of the first current measuring means 61 and the second current measuring means 62 are applied to an adder 7 in which the total current is determined from the two signals.
  • the total current is at one
  • Comparator 8 is set, which compares the total current with the predetermined from the control unit 1 ignition. According to the comparison in
  • Amperage in the primary circuit P by pulse width modulation and / or
  • the signal of the total current from the adder 7 is also applied to an integrator 9, which integrates the measured total current via an ignition process and thus determines the ignition energy. If the ignition energy exceeds a maximum energy likewise predetermined in the control unit 1, the electronic switch 2 is opened, that is, the ignition is interrupted. Thus, an overuse of the components, in particular the ignition coil 3 and the spark plug 5 is avoided.
  • Fig. 2 two graphs are shown.
  • the upper graph shows the control signals predetermined in the control unit 1, in particular the burning time ⁇ , the ignition current I Zv and the high-voltage supply E H over the time t.
  • the lower graph is the corresponding to the control of the control unit 1 at the
  • Ignition coil 3 applied ignition current l Zm over the time t indicated.
  • the control begins and the ignition current is adjusted via the built-up of adder 7, comparator 8, control unit 1 and electronic switch 2 control loop to the predetermined 100 mA. Due to the high switching frequency of the pulse signal of, for example, 50 kHz to 100 kHz, a continuous and very straightforward ignition current profile is achieved until the end of the burning time ⁇ (falling edge).
  • the exemplary embodiment according to FIG. 1 is advantageous in particular for internal combustion engines with a plurality of spark plugs (several cylinders), since only one control circuit is required if the ignition coils assigned to each spark plug are connected in parallel to each other via respectively associated electronic switches 2 after the first current measuring means 61. So it is imperative for this circuit that the first current measuring means is arranged in front of the branch to the electronic switches 2. Accordingly, the respective ignition coil associated freewheeling diodes 33 are summarized in a node at its base on which then with a second current measuring means 62 of the associated freewheeling current is measured sequentially.
  • Fig. 3 is a simplified embodiment as a switching principle
  • FIG. 4 shows a basic circuit of the ignition system according to the invention shown in FIG. 1, which additionally contains a secondary current correction. Since the circuit is otherwise constructed the same way as in Fig. 1, reference is made to the description of figures for Fig. 1 in this respect. The reference numerals are chosen accordingly. In Fig. 4, however, is an additional
  • Secondary current correction means 81 is provided, which acts on the controller 8 so that a generated in the secondary current correction means 81
  • ramp-shaped rising signal is superimposed on the control loop.
  • the ramp-shaped signal generated in the secondary current correction means 81 is triggered by the control unit 1, wherein the control unit 1 additionally transmits the slope of the ramp by means of secondary correction factor. This takes into account the
  • Secondary correction factor ie the slope of the ramp, the ignition coil type provided in the circuit.

Landscapes

  • 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)

Abstract

The invention relates to an ignition method for internal combustion engines having an ignition coil (3), which has a primary circuit (P) and a secondary circuit (S), and a spark plug (5) arranged in the secondary circuit (S), wherein the ignition current is a pulse signal, which is controlled by pulse-width modulation in the primary circuit (P), wherein the primary current presently flowing in the primary circuit (P) is measured, the measured primary current is compared with a specified target ignition current, and the pulse-width modulation and/or a frequency modulation of the pulse signal in the primary circuit (P) is adjusted according to the comparison result in order to achieve the target current. The invention further relates to an ignition system for internal combustion engines, comprising a control unit (1) for specifying an activation signal, a combustion duration, and an ignition current, an electronic switch (2) for producing a pulse signal, an ignition coil (3) having a primary winding (31) and a secondary winding (32), wherein the primary winding (31) is connected to a voltage source (4) by means of the electronic switch (2) and the secondary winding (31) supplies a spark plug (5), wherein a first current measuring means (61) is provided in order to determine the primary current flowing through the primary winding (31), downstream of which current measuring means a comparator (8) for comparing the primary current with the target ignition current specified by the control unit (1) is arranged, which comparator has means for acting on the electronic switch (2) for the pulse-width modulation and/or frequency modulation of the primary current and thus of the ignition amperage.

Description

B E S C H R E I B U N G  DESCRIPTION
Zündverfahren und Zündanlage dafür Ignition and ignition system for it
Die Erfindung betrifft ein Zündverfahren für Brennkraftmaschinen mit einer Zündspule mit Primärstromkreis und Sekundärstromkreis sowie einer im The invention relates to an ignition method for internal combustion engines with an ignition coil with primary circuit and secondary circuit and a in
Sekundärstromkreis angeordneten Zündkerze, wobei der Zündstrom ein Secondary circuit arranged spark plug, wherein the ignition current on
Pulssignal ist, das durch Pulsweitenmodulation im Primärstromkreis gesteuert wird. Ferner betrifft die Erfindung eine Zündanlage für Brennkraftmaschinen mit einer Steuereinheit zur Vorgabe eines Ansteuersignais, einer Brenndauer und eines Zündstromes, einem elektronischen Schalter zur Erzeugung eines  Pulse signal is controlled by pulse width modulation in the primary circuit. Furthermore, the invention relates to an ignition system for internal combustion engines with a control unit for specifying a drive signal, a burning time and an ignition current, an electronic switch for generating a
Pulssignales, einer Zündspule mit Primär- und Sekundärwicklung, wobei die Primärwicklung über den elektronischen Schalter an einer Spannungsquelle anliegt und die Sekundärwicklung eine Zündkerze versorgt. Pulse signals, an ignition coil with primary and secondary windings, wherein the primary winding via the electronic switch to a voltage source and the secondary winding supplies a spark plug.
Bei fremdgezündeten Brennkraftmaschinen ist ein Zündsystem zum Entflammen des Kraftstoff-Luft-Gemisches im Brennraum mittels eines Zündfunkens erforderlich. Dabei wird bei modernen fremdgezündeten Brennkraftmaschinen meist eine elektronische Zündanlage mit einer Zündspule als Energiespeicher eingesetzt. Um ein optimales Zündergebnis zu erreichen und gleichzeitig weder die Zündspule noch die Zündkerze zu überanspruchen, ist eine situationsgerechte Einstellung der für jeden Zündvorgang erforderlichen Zündenergie von entscheidender Bedeutung. In spark-ignition internal combustion engines, an ignition system for igniting the fuel-air mixture in the combustion chamber by means of a spark is required. In modern spark-ignited internal combustion engines usually an electronic ignition system is used with an ignition coil as energy storage. In order to achieve an optimal ignition result and at the same time not overstretching either the ignition coil or the spark plug, a situation-appropriate adjustment of the ignition energy required for each ignition process is of crucial importance.
Im Stand der Technik sind verschiedene Methoden zur Steuerung der In the prior art, various methods of controlling the
Zündenergie bekannt. Bei einer pulsweitenmodulierten Zündsteuerung wird der Zündstrom bzw. die Zündenergie von der in einer CPU abgelegten Software gesteuert. Dabei wird die Zündspule mit Impulsen variabler Breite angesteuert. Aus der EP 1 103 720 B1 ist ein Verfahren und Vorrichtung zur Stromregelung einer Zündanlage für einen Verbrennungsmotor bekannt, bei dem elektrische Energie in einem Magnetfeld, das durch einen Primärstrom aufgebaut worden ist, gespeichert und durch ein Unterbrechen des Primärstromes das Magnetfeld zusammenbricht und durch Induktion eine Hochspannung erzeugt, die zur Zündung verwendet wird, wobei ein Steuersignal einen Sollwert für den Ignition energy known. In the case of a pulse-width-modulated ignition control, the ignition current or the ignition energy is controlled by the software stored in a CPU. The ignition coil is driven with pulses of variable width. EP 1 103 720 B1 discloses a method and device for controlling the current of an ignition system for an internal combustion engine, in which electrical energy is generated in a magnetic field that has been established by a primary current. stored and interrupted by interrupting the primary current, the magnetic field and generates a high voltage by induction, which is used for ignition, wherein a control signal is a target value for the
Primärstrom angibt und mit einer Stromregelung der Primärstrom auf diesen Sollwert begrenzt wird, wobei zur Stromregelung nach Erreichen des Sollwertes des Primärstroms der Stromfluss von der Batterie zu einer Primärwicklung an- und abgeschaltet wird. Dieses Verfahren ermöglicht somit, die Magnetisierung einer Zündspule über einen bestimmten Zeitraum konstant zu halten, um dann zum gewünschten Zeitpunkt einen Zündfunken zu erzeugen. Zur Stromregelung wird eine Pulsweitenmodulation verwendet, wobei das Verfahren nach demIndicates primary current and is limited by a current control of the primary current to this setpoint, the power flow from the battery to a primary winding is switched on and off after reaching the setpoint of the primary current for current regulation. This method thus makes it possible to keep the magnetization of an ignition coil constant over a certain period of time in order to then generate a spark at the desired time. For current regulation, a pulse width modulation is used, the method according to the
Sperrwandlerbetrieb arbeitet und als Ist-Größe das Signal einer sekundärseitigen Ionen-Strommessung erhält. Flyback converter operates and receives the signal of a secondary-side ion current measurement as actual size.
Entsprechend wird bei den bekannten pulsweitenmodulierten Zündsteuergeräten eine Pulskette verwendet, um die Brenndauer des Zündfunkens einstellen zu können. Die Erzeugung der Schaltimpulse durch die CPU hat jedoch denAccordingly, in the known pulse-width-modulated ignition control units, a pulse train is used in order to be able to set the spark duration of the spark. However, the generation of the switching pulses by the CPU has the
Nachteil einer relativ niedrigen Schaltfrequenz, wodurch ein hoher Ripplestrom entsteht. Durch die fehlende Rückmeldung über den Ist-Zustand des Stromes kann eine Kontrolle über die optimale Funktion der Zündung nicht erfolgen. Beispielsweise wird ein Funkenabriss nicht erkannt, womit auch keine Disadvantage of a relatively low switching frequency, whereby a high Ripplestrom arises. Due to the lack of feedback about the actual state of the current control over the optimal function of the ignition can not be done. For example, a spark break is not detected, which also no
Gegenmaßnahmen eingeleitet werden können. Um Funkenabrisse möglichst zu vermeiden, wird im Stand der Technik eine höhere Zündenergie, als eigentlich nötig, zur Verfügung gestellt, was zu einem erhöhten Abbrand der Countermeasures can be initiated. To avoid spark breaks as possible, in the prior art, a higher ignition energy, as actually necessary, made available, resulting in increased burnup of
Zündkerzenelektroden führt. Spark plug leads.
Als weitere Zündungssteuerung ist die Pulszugzündung bekannt, die der pulsweitenmodulierten Zündsteuerung ähnelt, jedoch bewusst einen As a further ignition control, the pulse train ignition is known, which is similar to the pulse width modulated ignition control, but a conscious
Funkenabriss erzeugt. Die Zündspule wird dazu zwischen den Impulsen entmagnetisiert, was zu einem definierten Funkenabriss führt. Bei dem nächsten Impuls wird der Zündfunke dann wieder aufgebaut. Diese Betriebsart eignet sich insbesondere für Gemische, die eine relativ niedrige Zündenergie benötigen. Ein zwischen einer Pulszugzündung und einer Einzelpulszündung schaltbares Zündverfahren ist aus der EP 1 299 630 B1 bekannt. Sparking generated. The ignition coil is demagnetized between the pulses, which leads to a defined spark break. At the next pulse, the spark is then rebuilt. This operating mode is particularly suitable for mixtures that require a relatively low ignition energy. One between a pulse train ignition and a single pulse ignition switchable ignition method is known from EP 1 299 630 B1.
Ferner ist als drittes elektronisches Zündsystem eine Further, as the third electronic ignition system is a
Wechselspannungszündung bekannt, bei der der Primärkreis der Zündspule mit einer Wechselspannung versorgt wird. Dazu wird ein aus Zündspule und Kondensator gebildeter Resonanzkreis angesteuert, womit am Ausgang eine Hochspannung mit wechselnder Polarität vorliegt und entsprechend darauf abgestimmte Zündkerzen eingesetzt werden müssen.  AC ignition known in which the primary circuit of the ignition coil is supplied with an AC voltage. For this purpose, a formed from ignition coil and capacitor resonant circuit is driven, so at the output there is a high voltage with alternating polarity and accordingly matched spark plugs must be used.
Das Problem der ausreichenden Energiezufuhr und/oder Zünddauer sind beispielhaft in den Druckschriften EP 0 489 264 B1 und DE 101 55 972 A1 beschrieben. Eine Regelung des Zündstromes ist daraus jedoch nicht bekannt. The problem of sufficient energy supply and / or ignition duration are described by way of example in the publications EP 0 489 264 B1 and DE 101 55 972 A1. However, a regulation of the ignition current is not known.
Aufgabe der Erfindung ist es, eine Zündanlage bzw. ein Zündverfahren anzugeben, mit dem eine sichere Auslösung eines Zündfunkens mit Kontrolle des Zündvorgangs über die gesamte Zünddauer zur Verfügung gestellt wird, wobei eine übermäßige Beanspruchung der Zündspule und Zündkerze zu vermeiden ist. The object of the invention is to provide an ignition system or an ignition method, with which a safe triggering of a spark with control of the ignition process over the entire firing period is provided, with excessive use of the ignition coil and spark plug is to be avoided.
Gelöst wird diese Aufgabe mit einem Zündverfahren gemäß Anspruch 1 und einer Zündanlage gemäß Anspruch 6. This object is achieved with an ignition method according to claim 1 and an ignition system according to claim 6.
Erfindungsgemäß liegt der Grundgedanke darin, die Zündspule als According to the invention, the basic idea is that the ignition coil as
Stromübertrager einzusetzen. Durch die Erfassung des Primärstromes und Auswertung im Regelkreis kann der Zustand des Sekundärstromkreises zuverlässig erkannt werden. Im Falle einer Störung, beispielsweise bei stark abgebrannter Zündkerze, wird über den Regelkreis der Zündstrom sofort nachgeregelt, um einen Funkenabriss zu vermeiden. Diese Zündstromregelung reagiert somit automatisch auf Fehlerquellen auf der Sekundärstromseite. Jedem Zylinder bzw. jeder Zündkerze wird somit der individuell optimale Zündstrom zugeführt. Durch die Strommessung wird der Zustand der Zündkerzen stets überwacht und im Fehlerfall wird gegengeregelt. Dabei wirkt die Zündspule im Betrieb als Durchflusswandler. Die Anpassung des Zündstromes an den Sollstrom erfolgt durch Pulsweitenmodulation oder Frequenzmodulation oder Pulsweiten- und Frequenzmodulation. Bei einer Frequenzmodulation können besondere Charakteristiken der jeweiligen Zündspule sowie andere Parameter des Regelverhaltens berücksichtigt werden. Use current transformer. By detecting the primary current and evaluation in the control loop, the state of the secondary circuit can be reliably detected. In the event of a fault, for example in the case of heavily burnt out spark plugs, the ignition current is readjusted immediately via the control loop in order to avoid spark arrest. This ignition current control thus automatically reacts to sources of error on the secondary current side. Each cylinder or each spark plug thus the individually optimal ignition current is supplied. Through the current measurement, the condition of the spark plugs is always monitored and in the case of an error counter-regulated. The ignition coil acts in Operation as a forward converter. The adjustment of the ignition current to the desired current is carried out by pulse width modulation or frequency modulation or pulse width and frequency modulation. In a frequency modulation special characteristics of the respective ignition coil and other parameters of the control behavior can be considered.
Dadurch, dass ein momentan in der Zündspule induzierter Freilaufstrom gemessen wird und der momentane Primärstrom und der momentane By measuring a freewheeling current currently induced in the ignition coil and the instantaneous primary current and the instantaneous
Freilaufstrom zu einem Gesamtstrom addiert werden und der Gesamtstrom mit dem vorgegebenen Sollzündstrom verglichen wird, kann durch Erfassung des Freilaufstromes der Regelkreis auch für mehrere Zündspul-/Zündkerzensysteme für mehrzylinderige Brennkraftmaschinen verwendet werden. Dabei erfolgt eine Primärstrommessung vor der Verteilung des Primärstromes auf die jeweiligen den Zylindern bzw. Zündkerzen zugeordneten Zündspulen, also vor den elektronischen Schaltern, die parallel zueinander angeordnet sind. Die Freewheeling current can be added to a total current and the total current is compared with the predetermined Sollzündstrom can be used by detecting the freewheeling current of the control loop for multiple Zündspul- / spark plug systems for multi-cylinder internal combustion engines. In this case, a primary current measurement is carried out before the distribution of the primary current to the respective ignition coils assigned to the cylinders or spark plugs, ie before the electronic switches which are arranged parallel to one another. The
Strommessung erfolgt dabei sequentiell zunächst für den jeweils geschalteten Primärstrom und unmittelbar nachfolgend für den jeweils fließenden, in der zugeordneten Zündspule induzierten Freilaufstrom. Der Freilaufstrom wird über die in einem Knoten zusammengeschalteten Freilaufdioden mit dem zweiten Strommessmittel gemessen. Durch Erfassung und Aufaddierung des jeweiligen Primärstromes und des zugeordneten Freilaufstromes liegt dann eine verlässliche Vergleichsbasis für den vorgegebenen Sollzündstrom vor, die im Komparator verglichen werden kann und zur Regelung des Primärstromes über eine Pulsweitenmodulation und/oder eine Frequenzmodulation ausgenutzt werden kann. Wenn durch Integration des Gesamtstromes die der Zündspule zugeführteCurrent measurement is carried out sequentially first for each switched primary current and immediately following for each flowing, induced in the associated ignition coil freewheeling current. The freewheeling current is measured via the freewheeling diodes connected together in a node with the second current measuring means. By detecting and adding up the respective primary current and the associated freewheeling current, there is then a reliable comparison basis for the predetermined nominal ignition current, which can be compared in the comparator and used to control the primary current via pulse width modulation and / or frequency modulation. If by integrating the total current that of the ignition coil supplied
Energie ermittelt und bei Erreichen einer Maximalenergie die Stromzufuhr zur Zündspule unterbrochen wird, wird bei auftretenden Fehlern eine Überlastung der Zündspule und/oder Zündkerze vermieden. Dabei kann die Maximalenergie so gewählt werden, dass übliche Verschleisserscheinungen, insbesondere an der Zündkerze innerhalb eines Toleranzbereichs, der durch die Maximalenergie vorgegeben wird, abgedeckt sind. Wenn jedoch wesentliche Fehler im Determined energy and the power supply to the ignition coil is interrupted when a maximum energy is reached, an overload of the ignition coil and / or spark plug is avoided when errors occur. In this case, the maximum energy can be chosen so that the usual wear, especially on the spark plug within a tolerance range, by the maximum energy is given, are covered. If, however, significant errors in
Sekundärstromkreis, etwa in der Zündspule oder an der Zündkerze entstehen und somit die Maximalenergie bei einem Zündvorgang überschritten wird, wird die Zündung zur Vermeidung einer Überbeanspruchung der Komponenten unterbrochen. Vorrichtungsgemäß wird dies dadurch erreicht, dass ein Integrator vorgesehen ist, an dem das Signal des Gesamtstroms vom Addierer anliegt und zu einer Zündenergie integriert wird, wobei beim Erreichen einer der Zündspule zugeführten Maximalenergie der elektronische Schalter öffnet. Secondary circuit, such as arise in the ignition coil or on the spark plug and thus the maximum energy is exceeded in an ignition, the ignition is interrupted to avoid overuse of the components. According to the device, this is achieved in that an integrator is provided, against which the signal of the total current from the adder is applied and integrated into an ignition energy, the electronic switch opening upon reaching a maximum energy supplied to the ignition coil.
Dadurch, dass dem Primärstromkreis ein rampenförmiges Signal während der Brenndauer der Zündkerze überlagert wird, wird ein Abfall des Sekundärstromes über eine lange Brenndauer der Zündkerze verhindert. Vorrichtungsgemäß wird dies dadurch erreicht, dass ein Sekundärstromkorrekturmittel primärseitig an der Steuereinheit und dem Komparator angeschlossen ist, wobei das Characterized in that the primary circuit, a ramp-shaped signal is superimposed during the burning time of the spark plug, a drop in the secondary current over a long burning time of the spark plug is prevented. According to the device this is achieved in that a secondary current correction means is connected on the primary side to the control unit and the comparator, wherein the
Sekundärstromkorrekturmittel angesteuert von der Steuereinheit ein Secondary current correction means actuated by the control unit
rampenförmiges Signal während der Brenndauer der Zündkerze abgibt. Von der Steuereinheit wird das Sekundärstromkorrekturmittel angesteuert und auch die Steilheit der Rampe gewählt. Die Steilheit der Rampe kann je nach ramped signal during the burning time of the spark plug emits. The control unit controls the secondary current correction means and also selects the slope of the ramp. The steepness of the ramp can vary depending on
Zündspulentyp unterschiedlich vorgegeben werden. Entsprechend des jeweils angeschlossenen Zündspulentyps kann dann über die Konfiguration der Steuereinheit die richtige Rampe gewählt werden. In dem Sekundärstrommittel wird die Rampe so erzeugt, dass sie während der Brenndauer der Zündkerze abläuft und durch das Ansteigen des rampenförmigen Signals den sonst entstehenden Sekundärstromabfall verhindert. Ignition coil type can be specified differently. Depending on the respectively connected ignition coil type, the correct ramp can then be selected via the configuration of the control unit. In the secondary flow means, the ramp is generated so that it runs during the burning time of the spark plug and prevents the rise of the ramp signal, the otherwise resulting secondary current drop.
Wenn der Anfangszündstrom bis zum Zündüberschlag nicht geregelt wird, wird der Ladevorgang der Zündspule mit einem fest vorgegebenen Ladestrom durchgeführt, wonach die Zündstromregelung erst nach Zündüberschlag erfolgt. If the initial ignition current is not regulated until the flashover, the charging process of the ignition coil is carried out with a fixed charge current, after which the ignition current control takes place only after the flashover.
Wenn das Pulssignal eine feste oder geregelte Schaltfrequenz von 50 kHz und höher, insbesondere 50 kHz bis 100 kHz hat, kann trotz der Regelung ein sehr gradliniger Zündstromverlauf erreicht werden, der Stromspitzen vermeidet. Insbesondere wird der bei pulsweitenmodulierter Zündsteuerung bekannte Ripplestrom vermieden. If the pulse signal has a fixed or regulated switching frequency of 50 kHz and higher, in particular 50 kHz to 100 kHz, a very straightforward ignition current profile can be achieved despite the regulation, which avoids current peaks. In particular, the known with pulse width modulated ignition control Ripplestrom is avoided.
Nachfolgend wird ein Ausführungsbeispiel anhand der beiliegenden Figuren beschrieben: Darin zeigt: ein Schaltprinzip der erfindungsgemäßen Zündanlage, An embodiment will now be described with reference to the accompanying drawings, in which: shows a switching principle of the ignition system according to the invention,
Fig. 2 in zwei Graphen den Verlauf von Steuer- und Stromsignalen in der erfindungsgemäßen Zündanlage. Fig. 2 in two graphs the course of control and current signals in the ignition system according to the invention.
Fig. 3 ein Schaltprinzip einer vereinfachten Ausführungsform der Erfindung und Fig. 3 is a switching principle of a simplified embodiment of the invention and
Fig. 4 ein Schaltprinzip gemäß Fig. 1 mit Sekundärstromkorrektur. 4 shows a switching principle according to FIG. 1 with secondary current correction.
In Fig. 1 ist eine Prinzipschaltung der erfindungsgemäßen Zündanlage wiedergegeben. Die Schaltung weist eine Steuereinheit 1 auf, die beispielsweise eine CPU ist, in der die Parameter für den Betrieb der Zündanlage und deren Software abgespeichert ist. Als wesentliche Parameter sind dies die Vorgabe eines Ansteuersignais, die Vorgabe einer Brenndauer sowie die Vorgabe des Zündstroms. Ferner wird über die Steuereinheit 1 der Anfangszündstrom mit Aufladdauer, also somit das Hochspannungsangebot, vorgegeben. In Fig. 1, a basic circuit of the ignition system according to the invention is shown. The circuit has a control unit 1, which is for example a CPU, in which the parameters for the operation of the ignition system and its software is stored. As essential parameters, these are the specification of a drive signal, the specification of a burning time and the specification of the ignition current. Furthermore, the initial ignition current with charging duration, that is to say the high-voltage supply, is predetermined via the control unit 1.
Ferner weist die Schaltung einen elektronischen Schalter 2 in einem von einer Spannungsquelle 4 versorgten Primärstromkreis P auf. Der Primärstromkreis P führt über eine Primärwicklung 31 der Zündspule 3. Ferner ist im Furthermore, the circuit has an electronic switch 2 in a primary circuit P powered by a voltage source 4. The primary circuit P leads via a primary winding 31 of the ignition coil 3
Primärstromkreis P eine parallel zur Primärwicklung 31 der Zündspule 3 geschaltete Freilaufdiode 33 angeordnet. Im Primärkreislauf P ist ein erstes Strommessmittel 61 zur Ermittlung des momentan fließenden Primärstroms vorgesehen. Ferner ist in der zur Primärwicklung 31 parallelen Leitung mit der Freilaufdiode 33 ein zweites Strommessmittel 62 zum Messen des Primary circuit P a parallel to the primary winding 31 of the ignition coil 3 connected freewheeling diode 33 is arranged. In the primary circuit P, a first current measuring means 61 is provided for determining the instantaneously flowing primary current. Further, in the parallel to the primary winding 31 line with the Freewheeling diode 33, a second current measuring means 62 for measuring the
Freilaufstromes angeordnet. Freewheeling current arranged.
Die Zündspule 3 weist neben der Primärwicklung 31 eine Sekundärwicklung 32 (Hochspannungsteil) auf, die zusammen mit einer Zündkerze 5 ein The ignition coil 3 has, in addition to the primary winding 31, a secondary winding 32 (high-voltage part), which together with a spark plug 5 a
Sekundärstromkreis S bildet. Secondary circuit S forms.
Die beiden Messsignale des ersten Strommessmittels 61 und des zweiten Strommessmittels 62 sind auf einen Addierer 7 gelegt, in dem aus den beiden Signalen der Gesamtstrom ermittelt wird. Der Gesamtstrom ist an einen The two measuring signals of the first current measuring means 61 and the second current measuring means 62 are applied to an adder 7 in which the total current is determined from the two signals. The total current is at one
Komparator 8 gelegt, der den Gesamtstrom mit dem aus der Steuereinheit 1 vorgegebenen Zündstrom vergleicht. Entsprechend des Vergleichs im Comparator 8 is set, which compares the total current with the predetermined from the control unit 1 ignition. According to the comparison in
Komparator 8 wird der elektronische Schalter 2 so geregelt, dass der in der Steuereinheit 1 hinterlegte Sollzündstrom erreicht wird. Dabei wird die  Comparator 8, the electronic switch 2 is controlled so that the stored in the control unit 1 Sollzündstrom is achieved. Here is the
Stromstärke im Primärkreislauf P durch Pulsweitenmodulation und/oder Amperage in the primary circuit P by pulse width modulation and / or
Frequenzmodulation verändert. Im dargestellten Ausführungsbeispiel ist das Signal des Gesamtstromes aus dem Addierer 7 auch auf einen Integrator 9 gelegt, der den jeweils gemessenen Gesamtstrom über einen Zündvorgang integriert und somit die Zündenergie ermittelt. Übersteigt die Zündenergie eine in der Steuereinheit 1 ebenfalls vorgegebene Maximalenergie, wird der elektronische Schalter 2 geöffnet, also die Zündung unterbrochen. So wird eine Überbeanspruchung der Komponenten, insbesondere der Zündspule 3 und der Zündkerze 5 vermieden. Frequency modulation changed. In the illustrated embodiment, the signal of the total current from the adder 7 is also applied to an integrator 9, which integrates the measured total current via an ignition process and thus determines the ignition energy. If the ignition energy exceeds a maximum energy likewise predetermined in the control unit 1, the electronic switch 2 is opened, that is, the ignition is interrupted. Thus, an overuse of the components, in particular the ignition coil 3 and the spark plug 5 is avoided.
In Fig. 2 sind zwei Graphen wiedergegeben. Der obere Graph zeigt die in der Steuereinheit 1 vorgegebenen Steuersignale, insbesondere Brenndauer ΔΤ, Zündstrom lZv und Hochspannungsangebot EH über der Zeit t. Im unteren Graphen ist der entsprechend der Steuerung der Steuereinheit 1 an der In Fig. 2, two graphs are shown. The upper graph shows the control signals predetermined in the control unit 1, in particular the burning time ΔΤ, the ignition current I Zv and the high-voltage supply E H over the time t. In the lower graph is the corresponding to the control of the control unit 1 at the
Zündspule 3 anliegende Zündstrom lZm über der Zeit t angegeben. Ignition coil 3 applied ignition current l Zm over the time t indicated.
Aus Fig. 2 ist damit ersichtlich, dass über die gewünschte Brenndauer ΔΤ ein variierbarer, aber für eine Zündanlagenkonstellation fest vorgegebener Zündstrom lZv beispielsweise 100 mA (mittlere Linie) über die Regelung sehr genau in Form des momentanen Zündstromes lZm gehalten werden kann. Zum Beginn der Brenndauer ΔΤ (Anstieg des Signals) wird das Hochspannungsangebot EH in der Zündspule 3 durch die fest vorgegebene Ladeenergie bis zur absteigenden Flanke des Hochspannungsangebots EH aufgebaut. In diesem Zeitfenster erfolgt die Ionisierung der Funkenstrecke und der Durchbruch From Fig. 2 it is thus apparent that over the desired burning time ΔΤ a variierbarer, but fixed for an ignition system constellation Ignition current l Zv, for example, 100 mA (middle line) can be kept very precisely in the form of the instantaneous ignition current l Zm via the control. At the beginning of the burning time ΔΤ (increase of the signal), the high-voltage supply E H in the ignition coil 3 is established by the fixed charge energy to the descending edge of the high-voltage supply E H. In this time window, the ionization of the spark gap and the breakthrough takes place
(Zündüberschlag). Mit Beendigung des Hochspannungsangebotes EH (Zündüberschlag). With termination of the high-voltage supply E H
(absteigende Flanke) beginnt die Regelung und der Zündstrom wird über den aus Addierer 7, Komparator 8, Steuereinheit 1 und elektronischen Schalter 2 aufgebauten Regelkreis auf die vorgegebenen 100 mA eingeregelt. Aufgrund der hohen Schaltfrequenz des Pulssignals von beispielsweise 50 kHz bis 100 kHz wird ein stetiger und sehr gradliniger Zündstromverlauf bis zum Ende der Brenndauer ΔΤ (absteigende Flanke) erreicht. (Descending edge), the control begins and the ignition current is adjusted via the built-up of adder 7, comparator 8, control unit 1 and electronic switch 2 control loop to the predetermined 100 mA. Due to the high switching frequency of the pulse signal of, for example, 50 kHz to 100 kHz, a continuous and very straightforward ignition current profile is achieved until the end of the burning time ΔΤ (falling edge).
Das Ausführungsbeispiel gemäß Fig. 1 ist insbesondere für Brennkraftmaschinen mit mehreren Zündkerzen (mehrere Zylinder) vorteilhaft, da nur ein Regelkreis erforderlich ist, wenn die zu jeder Zündkerze zugeordneten Zündspulen parallel zueinander über jeweils zugeordnete elektronische Schalter 2 nach dem ersten Strommessmittel 61 angeschlossen sind. Also ist es für diese Schaltung zwingend erforderlich, dass das erste Strommessmittel vor der Verzweigung zu den elektronischen Schaltern 2 angeordnet ist. Entsprechend sind auch die der jeweiligen Zündspule zugeordneten Freilaufdioden 33 in einem Knoten an ihrer Basis zusammengefasst, an der dann mit einem zweiten Strommessmittel 62 der zugeordnete Freilaufstrom sequentiell gemessen wird. The exemplary embodiment according to FIG. 1 is advantageous in particular for internal combustion engines with a plurality of spark plugs (several cylinders), since only one control circuit is required if the ignition coils assigned to each spark plug are connected in parallel to each other via respectively associated electronic switches 2 after the first current measuring means 61. So it is imperative for this circuit that the first current measuring means is arranged in front of the branch to the electronic switches 2. Accordingly, the respective ignition coil associated freewheeling diodes 33 are summarized in a node at its base on which then with a second current measuring means 62 of the associated freewheeling current is measured sequentially.
In Fig. 3 ist ein vereinfachtes Ausführungsbeispiel als Schaltprinzip In Fig. 3 is a simplified embodiment as a switching principle
wiedergegeben. Dabei wird lediglich der Primärstrom mit einem ersten played. In this case, only the primary current with a first
Strommessmittel 61 gemessen und über einen Komparator 8 mit einem von einer Steuereinheit 1 vorgegebenen Sollzündstrom verglichen, so dass der Zündstrom entsprechend geregelt wird. Bei dieser Schaltung, die einen Regelkreis je Zündspule-/Zündkerzen-Einheit aufweist, ist eine Freilaufstrommessung nicht erforderlich. In Fig. 4 ist eine Prinzipschaltung der erfindungsgemäßen Zündanlage gemäß Fig. 1 wiedergegeben, die zusätzlich eine Sekundärstromkorrektur enthält. Da die Schaltung im übrigen genauso aufgebaut ist, wie in Fig. 1 , wird insoweit auf die Figurenbeschreibung zur Fig. 1 verwiesen. Die Bezugszeichen sind entsprechend gewählt. In Fig. 4 ist jedoch zusätzlich ein Current measuring 61 measured and compared via a comparator 8 with a predetermined by a control unit 1 Sollzündstrom, so that the ignition current is controlled accordingly. In this circuit, which has a control loop per ignition coil / spark plug unit, a freewheel current measurement is not required. 4 shows a basic circuit of the ignition system according to the invention shown in FIG. 1, which additionally contains a secondary current correction. Since the circuit is otherwise constructed the same way as in Fig. 1, reference is made to the description of figures for Fig. 1 in this respect. The reference numerals are chosen accordingly. In Fig. 4, however, is an additional
Sekundärstromkorrekturmittel 81 vorgesehen, das auf die Regelung 8 so einwirkt, dass ein in dem Sekundärstromkorrekturmittel 81 erzeugtes  Secondary current correction means 81 is provided, which acts on the controller 8 so that a generated in the secondary current correction means 81
rampenformig ansteigendes Signal dem Regelkreis überlagert wird. Ausgelöst wird das im Sekundärstromkorrekturmittel 81 erzeugte rampenformige Signal von der Steuereinheit 1 , wobei die Steuereinheit 1 zusätzlich die Steilheit der Rampe mittels Sekundärkorrekturfaktor übermittelt. Dabei berücksichtigt der ramp-shaped rising signal is superimposed on the control loop. The ramp-shaped signal generated in the secondary current correction means 81 is triggered by the control unit 1, wherein the control unit 1 additionally transmits the slope of the ramp by means of secondary correction factor. This takes into account the
Sekundärkorrekturfaktor, also die Steilheit der Rampe, den im Schaltkreis vorgesehenen Zündspulentyp. Mit dem Sekundärstromkorrekturmittel 81 ist es somit möglich, den Abfall des Sekundärstromes bei einer langen Brenndauer der Zündkerze 5 durch ein dem Regelkreis überlagertes rampenformig ansteigendes Signal auszugleichen. Die Güte des Zündvorgangs über die gesamte Zünddauer wird somit weiter verbessert. Secondary correction factor, ie the slope of the ramp, the ignition coil type provided in the circuit. With the secondary current correction means 81, it is thus possible to compensate for the drop in the secondary current during a long burning period of the spark plug 5 by means of a ramp-shaped signal superimposed on the control loop. The quality of the ignition process over the entire ignition duration is thus further improved.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
1 Steuereinheit 1 control unit
2 elektronischer Schalter  2 electronic switch
3 Zündspule  3 ignition coil
31 Primärwicklung  31 primary winding
32 Sekundärwicklung  32 secondary winding
33 Freilaufdiode  33 freewheeling diode
4 Spannungsquelle  4 voltage source
5 Zündkerze  5 spark plug
61 erstes Strommessmittel  61 first current measuring means
62 zweites Strommessmittel  62 second current measuring means
7 Addierer  7 adders
8 Komparator; Regelung  8 comparator; regulation
81 Sekundärstromkorrekturmittel  81 secondary current correction means
9 Integrator  9 integrator
P Primärstromkreis  P primary circuit
S Sekundärstromkreis  S secondary circuit

Claims

P A T E N T A N S P R Ü C H E P A T E N T A N S P R E C H E
Zündverfahren für Brennkraftmaschinen mit Ignition method for internal combustion engines with
einer Zündspule (3) mit Primärstromkreis (P) und  an ignition coil (3) with primary circuit (P) and
Sekundärstromkreis (S) sowie  Secondary circuit (S) as well
einer im Sekundärstromkreis (S) angeordneten Zündkerze (5), wobei der Zündstrom ein Pulssignal ist, das durch  a spark plug (5) arranged in the secondary circuit (S), the ignition current being a pulse signal passing through
Pulsweitenmodulation im Primärstromkreis (P) gesteuert wird, dadurch gekennzeichnet, dass  Pulse width modulation in the primary circuit (P) is controlled, characterized in that
der momentan im Primärstromkreislauf (P) fließende Primärstrom gemessen wird,  the primary current currently flowing in the primary circuit (P) is measured,
der gemessene Primärstrom mit einem vorgegebenen  the measured primary current with a predetermined
Sollzündstrom verglichen wird und,  Nominal ignition current is compared and
die Pulsweitenmodulation und/oder eine Frequenzmodulation des Pulssignals im Primärstromkreis (P) entsprechend dem  the pulse width modulation and / or a frequency modulation of the pulse signal in the primary circuit (P) according to
Vergleichsergebnis zum Erreichen des Sollstroms nachgeregelt wird.  Adjustment result is readjusted to reach the desired current.
Zündverfahren nach Anspruch 1 , dadurch gekennzeichnet, dass ein momentan in der Zündspule (3) induzierter Freilaufstrom gemessen wird und der momentane Primärstrom und der momentane Freilaufstrom zu einem Gesamtstrom addiert werden und der Gesamtstrom mit dem vorgegebenen Sollzündstrom verglichen wird. Ignition method according to claim 1, characterized in that a currently in the ignition coil (3) induced freewheeling current is measured and the current primary current and the instantaneous freewheeling current are added to a total current and the total current is compared with the predetermined Sollzündstrom.
Zündverfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass durch Integration des Gesamtstromes die der Zündspule (3) zugeführte Energie ermittelt und bei Erreichen einer Maximalenergie die Ignition method according to claim 1 or 2, characterized in that by integrating the total current of the ignition coil (3) supplied energy determined and upon reaching a maximum energy the
Stromzufuhr zur Zündspule (3) unterbrochen wird. Power supply to the ignition coil (3) is interrupted.
4. Zündverfahren nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, dass dem Primärstromkreis ein rampenförmig ansteigendes Signal während der Brenndauer der Zündkerze überlagert wird. 4. Ignition method according to claim 1, 2 or 3, characterized in that the primary circuit, a ramp-shaped rising signal is superimposed during the burning time of the spark plug.
5. Zündverfahren nach Anspruch 2, 3 oder 4, dadurch gekennzeichnet, dass der Anfangszündstrom bis zum Zündüberschlag nicht geregelt wird. 5. ignition method according to claim 2, 3 or 4, characterized in that the Anfangszündstrom is not regulated until the flashover.
Zündanlage für Brennkraftmaschinen, mit Ignition system for internal combustion engines, with
einer Steuereinheit (1 ) zur Vorgabe eines Ansteuersignais, einer Brenndauer und eines Zündstromes,  a control unit (1) for presetting a drive signal, a burning time and an ignition current,
einem elektronischen Schalter (2) zur Erzeugung eines  an electronic switch (2) for generating a
Pulssignales,  Pulse signal,
einer Zündspule (3) mit Primär (31 )- und Sekundärwicklung (32), wobei die Primärwicklung (31 ) über den elektronischen Schalter (2) an einer Spannungsquelle (4) anliegt und die  an ignition coil (3) with primary (31) and secondary winding (32), wherein the primary winding (31) via the electronic switch (2) to a voltage source (4) is applied and the
Sekundärwicklung (32) eine Zündkerze (5) versorgt,  Secondary winding (32) supplies a spark plug (5),
dadurch gekennzeichnet, dass ein erstes Strommessmittel (61 ) zur Bestimmung des über die Primärwicklung (31 ) fließenden Primärstromes vorgesehen ist, dem ein Komparator (8) zum Vergleich mit dem von der Steuereinheit (1 ) vorgegebenen Sollzündstrom nachgeordnet ist, der Wirkmittel auf den elektronischen Schalter (2) zur Pulsweiten- und/oder Frequenzmodulation des Primärstromes und damit der Zündstromstärke hat.  characterized in that a first current measuring means (61) for determining the primary winding (31) flowing primary current is provided, which is followed by a comparator (8) for comparison with the predetermined by the control unit (1) Sollzündstrom, the active agent on the electronic Switch (2) for pulse width and / or frequency modulation of the primary current and thus the Zündstromstärke has.
Zündanlage für Brennkraftmaschinen nach Anspruch 6, dadurch gekennzeichnet, dass ein zweites Strommessmittel (62) zur Bestimmung des in der Primärwicklung (31 ) induzierten Freilaufstromes sowie ein Addierer (7) zur Addition der mit beiden Strommessmitteln (61 ), (62) gemessenen Ströme zum Gesamtstrom vorgesehen sind, wobei der Gesamtstrom an den Komparator (8) gelegt ist. Zündanlage nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass ein Integrator (9) vorgesehen ist, an dem das Signal des Gesamtstroms vom Addierer (7) anliegt und zu einer Zündenergie integriert wird, wobei beim Erreichen einer der Zündspule (3) zugeführten Maximalenergie der elektronische Schalter (2) öffnet. Ignition system for internal combustion engines according to claim 6, characterized in that a second current measuring means (62) for determining the freewheeling current induced in the primary winding (31) and an adder (7) for adding the currents measured by the two current measuring means (61), (62) Total current are provided, wherein the total current is applied to the comparator (8). Ignition system according to claim 6 or 7, characterized in that an integrator (9) is provided, on which the signal of the total current from the adder (7) is applied and integrated into an ignition energy, wherein upon reaching one of the ignition coil (3) supplied maximum energy of electronic switch (2) opens.
Zündanlage nach Anspruch 6, 7 oder 8, dadurch gekennzeichnet, dass ein Sekundärstromkorrekturmittel (81 ) primärseitig an der Ignition system according to claim 6, 7 or 8, characterized in that a secondary current correction means (81) on the primary side of the
Steuereinheit (1 ) und dem Komparator (8) angeschlossen ist, wobei das Sekundärstromkorrekturmittel (81 ) angesteuert von der Steuereinheit (1 ) ein rampenförmig ansteigendes Signal während der Brenndauer der Zündkerze abgibt.  Control unit (1) and the comparator (8) is connected, wherein the secondary current correction means (81) driven by the control unit (1) emits a ramp-shaped rising signal during the burning time of the spark plug.
10. Zündanlage nach Anspruch 6, 7, 8 oder 9, dadurch gekennzeichnet, dass das Pulssignal eine feste oder geregelte Schaltfrequenz von 50 kHz und höher, insbesondere 50 kHz bis 100 kHz hat. 10. Ignition system according to claim 6, 7, 8 or 9, characterized in that the pulse signal has a fixed or regulated switching frequency of 50 kHz and higher, in particular 50 kHz to 100 kHz.
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Also Published As

Publication number Publication date
EP2547897B1 (en) 2016-08-31
US20120325190A1 (en) 2012-12-27
DE102010015998A1 (en) 2011-09-22
WO2011113431A1 (en) 2011-09-22
PL2547897T3 (en) 2017-02-28
ES2599409T3 (en) 2017-02-01
US8893692B2 (en) 2014-11-25

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