EP0496050A2 - Testing device of ignition installation - Google Patents

Testing device of ignition installation Download PDF

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Publication number
EP0496050A2
EP0496050A2 EP91119498A EP91119498A EP0496050A2 EP 0496050 A2 EP0496050 A2 EP 0496050A2 EP 91119498 A EP91119498 A EP 91119498A EP 91119498 A EP91119498 A EP 91119498A EP 0496050 A2 EP0496050 A2 EP 0496050A2
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EP
European Patent Office
Prior art keywords
signal
ignition
switching means
point
decoupling
Prior art date
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Granted
Application number
EP91119498A
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German (de)
French (fr)
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EP0496050B1 (en
EP0496050A3 (en
Inventor
Karl-Heinz Dittmann
Peter Dipl.-Ing. Etzold
Uwe Dipl.-Ing. Fischer
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0496050A3 publication Critical patent/EP0496050A3/xx
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    • 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
    • F02P17/10—Measuring dwell or antidwell time
    • 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
    • F02P17/02—Checking or adjusting ignition timing

Definitions

  • the invention relates to a device for testing an ignition system according to the preamble of the main claim.
  • a device for detecting ignition signals is known, which is particularly suitable for multi-coil ignition systems.
  • second decoupling means of opposite passage directions are provided, which can also be connected to the switching connections.
  • the decoupling means are implemented as diode groups.
  • the first group of diodes brings together those signals at the ignition coils that occur during the opening phase of ignition switching elements.
  • the second group of diodes combines the signals that are present during the closing phase of the elements.
  • the circuit arrangement shown contains a load resistor for the first diode group.
  • a load resistance required for the second group of diodes is not shown in the known circuit arrangement, since there the focus is on the principle of operation of the signal combination. If the first group of diodes has a load resistor connected to ground has, it is easily possible to provide the second diode group with a load resistor connected to the supply voltage. However, such a circuit would not provide a reliable measurement result in all operating cases.
  • the invention has for its object to develop the device known from DE-OS 38 41 739.
  • a series circuit comprising a load resistor is provided for second decoupling means and switching means which are actuated as a function of the signal level occurring at the first decoupling means ensures that there is a correct input signal at the input of a signal processing arrangement in all operating states. Incorrect measurements and misinterpretations due to apparent measurement results are thereby reliably prevented.
  • the test device according to the invention is suitable for diagnosing ignition systems with more than one ignition coil.
  • the high-voltage distribution can be carried out without a distributor or with at least one distributor.
  • first comparison means are provided which compare the signal level occurring at the decoupling means with a first threshold and actuate the switching means when the threshold is exceeded. With the same switching signal, further switching means can be actuated, which switch between the decoupling means.
  • second comparison means are provided in the signal processing arrangement, which compare the signal level occurring at the input of the signal processing arrangement with a second threshold and actuate the switching means when the threshold is exceeded.
  • first comparison means according to the first embodiment are preferably implemented as a fast-working discrete circuit arrangement that can simultaneously switch the other switching means with sufficient speed
  • second comparison means according to the other embodiment are preferably implemented in a microcomputer circuit, which has the advantage that a further Delay provided according to the invention when the switching means are switched off can be implemented in the software of the microprocessor arrangement without further effort.
  • a further embodiment provides that the load resistance for the second decoupling means can be connected via third decoupling means to a power supply connection of the ignition coils and / or the power supply of the device according to the invention and / or to a battery which is provided for supplying power to the ignition system.
  • FIG. 10 a block diagram of an ignition system 10 is shown, which contains two ignition coils 11, 12.
  • First primary connections 13, 14 of the ignition coils 11, 12 are connected - possibly via an ignition switch (not shown) - to a first connection 15 of an energy source 16, the second connection 17 of which is connected to a ground 18.
  • Second primary connections 19, 20 of the ignition coils 11, 12 are connected to an ignition switching device 21, which contains ignition switching elements, which are not identified in more detail, and which switch the second primary connections 19, 20 to ground 18.
  • a first and second secondary connection 22, 23 of the ignition coil 11 each lead to spark plugs 24, 25 which are connected to ground 18.
  • a first secondary connection of the ignition coil 12 is connected to the second primary connection 20, while a second secondary connection 27 is connected to a further spark plug 28, which is also connected to ground 18.
  • the test device 30 according to the invention for testing the ignition system 10 is drawn in dashed lines separated from the ignition system 10.
  • a first and second input 31, 32 of the test device 30 can be connected via connection points 33, 34 to the second primary connections 19, 20 of the ignition coils 11, 12, respectively.
  • the two inputs 31, 32 are each provided with first and second decoupling means 35, 36; 37, 38 connected.
  • the first decoupling means 35, 36 lead to a first signal combining point 39, while the second decoupling means 37, 38 lead to a second signal combining point 40.
  • the two signal merging points 39, 40 are with Switching means 41 connected, select between the two points 39, 40.
  • a switching means connection leads as an input signal 42 to a signal processing arrangement 43 which is surrounded by dashed lines.
  • the input signal 42 first arrives in an input arrangement 44 which contains a voltage divider 45 connected to ground 18.
  • First comparison means 47 are connected to an output 46 of the input arrangement 44 and emit a signal to a first signal delay arrangement 48, which in turn actuates switching means 49 which are connected to the second signal combining point 40 via a load resistor 50.
  • Second comparison means 51 are connected to the first signal junction point 39, to which an input signal is also fed, which is tapped from the first connection 15 of the energy source 16.
  • An output 52 of the second comparison means 51 actuates the switching means 41 and simultaneously outputs a signal to a second signal delay arrangement 53 which actuates the switching means 49.
  • the switching means 49 are connected to further circuit points via third decoupling means 54, 55, 56.
  • the decoupling means 55 is connected to the first connection 15 of the energy source 16.
  • the decoupling means 54 leads to a power supply 57, not described in more detail, of the test device 30 according to the invention.
  • the decoupling means 55 leads to the first primary connections 13, 14 of the ignition coils 11, 12, provided that these primary connections from the first connection 15 of the energy source 16 are not shown in the figure Ignition switches are separable.
  • the test device according to the invention works as follows:
  • the test device 30 according to the invention enables the detection of signal profiles that occur in the ignition system 10 on the primary side of the ignition coils 11, 12. Instead of complete signal profiles, trigger signals can also be derived from the ignition system 10.
  • the ignition system 10 works with a stationary high-voltage distribution.
  • the term "static high-voltage distribution" designates ignition systems 10 which no longer have conventional distributors.
  • the ignition system 10 therefore contains more than one ignition coil 10, 11 in order to be able to ignite a plurality of spark plugs 24, 25, 28 of multi-cylinder engines in a chronologically offset sequence. In the example, two ignition coils 11, 12 are shown. However, further ignition coils can easily be provided.
  • the ignition coils 11, 12 are, for example, conventional coils which are used in battery or transistor ignition systems. But it can also be coils that are used in thyristor or high-frequency ignition systems, which are referred to as high-voltage transformers.
  • test device 30 according to the invention is equally suitable for diagnosing ignition systems with more than one ignition coil and with at least one distributor.
  • the test device 30 has a number of inputs 31, 32 corresponding to the ignition coils 11, 12, which can be connected to the second connections 19, 20 of the ignition coils 11, 12 via the connection points 33, 34, respectively.
  • the second primary connections 19, 20 are connected to ignition switching elements, which are accommodated in the ignition switching device 21. These ignition switching elements, not shown in detail, temporarily connect the second primary connections 19, 20 to ground 18, for example. After opening the ignition switching elements, a high-voltage signal is produced on the secondary side of the ignition coils 11, 12, which leads to the ignition of the spark plugs 24, 25, 28.
  • Other components that are required for the generation of high-voltage pulses, such as for example, capacitors on the primary side are not shown in the figure because they have no significance for the basic function of the test device according to the invention.
  • the inputs 31, 32 lead to the two decoupling means 35, 36; 37, 38.
  • the decoupling means are components which have a preferred direction for the electric current.
  • diodes or transistors connected as diodes are suitable.
  • the first diodes 35, 36 combine a signal at the inputs 31, 32, which has a positive potential compared to the potential at the first point 39 in the diode polarity shown in the figure.
  • a special load resistance for the first diodes 35, 36 is not provided in the circuit arrangement.
  • a load resistance is provided, for example, by an input circuit, which is arranged in the second comparison means 51, or by the input arrangement 44 of the signal processing arrangement 43, which each produce a current path, preferably against ground 18.
  • the second diodes 37, 38 combine the signals at the inputs 31, 32 which have a negative potential with respect to the point 40.
  • the second diodes 37, 38 are connected to a positive potential with respect to ground 18 via the load resistor 50 and the switching means 49.
  • the positive potential is, for example, the potential to be tapped at the first connection 15 of the energy source 16 of the ignition system 10 and / or the potential taken from the power supply 27 of the test device 30 and / or a potential which can be tapped at the first primary connections 13, 14 of the ignition coils 11, 12. This connection is not shown in the figure. It can be provided in particular if between the first primary connections 13, 14 and the first connection 15 of the energy source 16 an ignition switch, not shown in the figure, is provided.
  • the third decoupling means 54, 55, 56 are provided, which are preferably implemented as diodes or as transistors, which are connected as diodes.
  • signals from the second primary connections 19, 20 of the ignition coils 11, 12 are combined, which occur in particular during the opening phase of the ignition switching elements. It is in this phase that the ignition process, the spark duration, and generally the opening time of the ignition switching elements. In particular, the signals that occur during the closing time of the ignition switching elements are combined at the second signal combining point 40. During this time, the second primary connections 19, 20 of the ignition coils 11, 12 are connected to ground 18 via the ignition switching elements, so that a primary current can be built up on the primary sides 11, 12 in this phase.
  • the switching means 41 enable the selection of one of the two signal combining points 39, 40 which are connected to the signal processing arrangement 43.
  • the switching means 41 are preferably implemented as an electronic switch. The switchover could in principle be done manually. The diagnosis would then be based on the longer observation of the signals located at the first point 39 and after switching over, the signals located at the point 40.
  • the changeover switch 41 is preferably actuated by the second comparison means 51, which compare the potential at the first point 39 with a threshold value, which in the following with reference to a first threshold value in the first comparison means 47 is referred to as the second threshold.
  • the second threshold value is, for example, at least at the potential at which the connection 15 of the energy source 16 lies.
  • the second threshold value is preferably set to a higher value, in which additional forward voltages of semiconductor components and of protective circuits, which are not detailed, are taken into account.
  • the second threshold is set to approximately 20 V, for example. If the potential at the first point 39 exceeds the second threshold, the second comparison means 51 actuate the changeover switch 41 in such a way that it connects the first point 39 to the input 42 of the signal processing arrangement 43. If the potential at the first point 39 is below, the changeover switch 41 is placed at the second point 40.
  • the output 52 of the second comparison means 51 also leads to the signal delay arrangement 53, which actuates the switching means 49.
  • the switching means 49 are preferably an electronic switch, which is implemented, for example, as a transistor.
  • the signal occurring at the output 52 which actuates the changeover switch 41 can also be used to actuate the switch 49.
  • second switch 49 is closed.
  • the second signal delay arrangement 53 ensures that the switch 49 remains closed for a predeterminable time. The time is set, for example, such that switch 49 remains closed when testing ignition system 10 of a very slow-running single-cylinder engine.
  • the load resistance of the second diodes 37, 38 with positive potential can be connected to the switch 49 as a function of the signal level occurring at the first diodes 35, 36. This measure proves to be particularly useful in certain operating states. If the working resistance 50 was permanently connected to a positive potential, for example with open inputs 31, 32 the positive signal potential would always be present at the second signal combining point 40. An apparent signal or an apparent measured value, which corresponds approximately to the positive potential at the load resistor 50, could be present at the subsequent signal-processing arrangement 43, at the input 42 of which further measuring devices not described in the present description can be connected.
  • the second comparison means 51 merely switch the changeover switch 41.
  • the switch 49 is actuated by the signal processing arrangement 43.
  • the arrangement 43 contains the first comparison means 41, which compare the potential at the voltage divider 45 with a first threshold.
  • the first threshold could be set according to the same criteria as the second threshold.
  • the first threshold should also be set such that it is ensured that the switch 49 is only closed when a sufficiently high potential occurs at the first signal merging point 39.
  • the first comparison means 47 are connected in the figure to the output 46 of the voltage divider 45. It is also possible to provide the first comparison means 47 directly at the input 42.
  • the first threshold is preferably also set to a potential that lies above the potential at the first connection 15 of the energy source 16.
  • the threshold can be, for example, between 20 V and 12 V for a power supply approx. 100 V. Such high voltage values are no longer present in the signal processing arrangement 43 because the voltage divider 45, if provided, brings about a reduction. Furthermore, the signal processing arrangement 43, with the exception of the voltage divider 45, is preferably implemented in a microprocessor system which works with numbers instead of absolute voltages. The first threshold can therefore be set to an internal value that relates to the input 42.
  • the output of the first comparison means 47 actuates the switch 49 via the first signal delay arrangement 48.
  • the second signal delay arrangement 48 is provided, which has the same task as that in the first example.
  • the second comparison means 51 are furthermore preferably provided, which allow the first switch 41 to be switched over quickly.

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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)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

A device for testing an ignition system (10) with quiescent high voltage distribution is proposed whose inputs (31, 32) ....which.... can be connected to primary terminals (19, 20) of ignition coils (11, 12). The signals applied to the inputs (31, 32) are combined from the first isolation means (35, 36) at a first signal combination point (39) and from second isolation means (37, 38) at a second signal combination point (40) respectively. For the second isolation means (37, 38) a working resistor (50) is provided which is connected in series with a switch (49). The switch (49) is controlled as a function of the potential occurring at the first signal combination point (39). <IMAGE>

Description

Die Erfindung geht aus von einer Vorrichtung zum Prüfen einer Zündanlage nach der Gattung des Hauptanspruchs. Aus der DE-OS 38 41 739 ist eine Vorrichtung zum Erfassen von Zündsignalen bekannt, die insbesondere für Mehrspulen-Zündanlagen geeignet ist. Es sind erste Entkopplungsmittel vorgegebener Durchlaßrichtungen vorhanden, die jeweils mit primären Schaltanschlüssen der Zündspulen verbindbar sind. Weiterhin sind zweite Entkopplungsmittel entgegengesetzter Durchlaßrichtungen vorgesehen, die ebenfalls jeweils mit den Schaltanschlüssen verbindbar sind. Die Entkopplungsmittel sind als Diodengruppen realisiert. Die erste Diodengruppe führt diejenigen an den Zündspulen liegenden Signale zusammen, die während der Öffnungsphase von Zündungsschaltelementen auftreten. Die zweite Diodengruppe führt die Signale zusammen, die während der Schließphase der Elemente vorhanden sind. Die gezeigte Schaltungsanordnung enthält einen Arbeitswiderstand für die erste Diodengruppe. Ein für die zweite Diodengruppe erforderlicher Arbeitswiderstand ist in der bekannten Schaltungsanordnung nicht gezeigt, da dort die prinzipielle Wirkungsweise der Signalzusammenfassung im Vordergrund steht. Wenn die erste Diodengruppe einen gegen Masse geschalteten Arbeitswiderstand
aufweist, ist es ohne weiteres möglich, die zweite Diodengruppe mit einem gegen die Versorgungsspannung geschalteten Arbeitswiderstand zu versehen. Eine derartige Beschaltung würde jedoch nicht in allen Betriebsfällen ein zuverlässiges Meßergebnis bereitstellen.The invention relates to a device for testing an ignition system according to the preamble of the main claim. From DE-OS 38 41 739 a device for detecting ignition signals is known, which is particularly suitable for multi-coil ignition systems. There are first decoupling means of predetermined forward directions, each of which can be connected to primary switching connections of the ignition coils. Furthermore, second decoupling means of opposite passage directions are provided, which can also be connected to the switching connections. The decoupling means are implemented as diode groups. The first group of diodes brings together those signals at the ignition coils that occur during the opening phase of ignition switching elements. The second group of diodes combines the signals that are present during the closing phase of the elements. The circuit arrangement shown contains a load resistor for the first diode group. A load resistance required for the second group of diodes is not shown in the known circuit arrangement, since there the focus is on the principle of operation of the signal combination. If the first group of diodes has a load resistor connected to ground
has, it is easily possible to provide the second diode group with a load resistor connected to the supply voltage. However, such a circuit would not provide a reliable measurement result in all operating cases.

Der Erfindung liegt die Aufgabe zugrunde, die aus der DE-OS 38 41 739 bekannte Vorrichtung weiterzubilden.The invention has for its object to develop the device known from DE-OS 38 41 739.

Die Aufgabe wird durch die im Hauptanspruch angegebenen Merkmale gelöst.The object is achieved by the features specified in the main claim.

Vorteile der ErfindungAdvantages of the invention

Mit der erfindungsgemäßen Maßnahme, daß eine Reihenschaltung aus einem Arbeitswiderstand für zweite Entkopplungsmittel und Schaltmitteln vorgesehen ist, die in Abhängigkeit von dem an den ersten Entkopplungsmitteln auftretenden Signalpegel betätigt werden, ist sichergestellt, daß in allen Betriebszuständen ein richtiges Eingangssignal am Eingang einer signalverarbeitenden Anordnung vorliegt. Fehlmessungen und Fehlinterpretationen durch scheinbaren Meßergebnissen werden dadurch sicher verhindert.The measure according to the invention that a series circuit comprising a load resistor is provided for second decoupling means and switching means which are actuated as a function of the signal level occurring at the first decoupling means ensures that there is a correct input signal at the input of a signal processing arrangement in all operating states. Incorrect measurements and misinterpretations due to apparent measurement results are thereby reliably prevented.

Die erfindungsgemäße Prüfvorrichtung ist zur Diagnose von Zündanlagen mit mehr als einer Zündspule geeignet. Die Hochspannungsverteilung kann verteilerlos oder mit wenigstens einem Verteiler vorgenommen sein.The test device according to the invention is suitable for diagnosing ignition systems with more than one ignition coil. The high-voltage distribution can be carried out without a distributor or with at least one distributor.

Vorteilhafte Weiterbildungen und Verbesserungen der erfindungsgemäßen Vorrichtung ergeben sich aus Unteransprüchen.Advantageous further developments and improvements of the device according to the invention result from subclaims.

In einer ersten vorteilhaften Ausgestaltung sind erste Vergleichsmittel vorgesehen, welche den an den Entkopplungsmitteln auftretenden Signalpegel mit einer ersten Schwelle vergleichen und bei Überschreiten der Schwelle die Schaltmittel betätigen. Mit demselben Schaltsignal können auch weitere Schaltmittel betätigt werden, die zwischen den Entkopplungsmitteln umschalten.In a first advantageous embodiment, first comparison means are provided which compare the signal level occurring at the decoupling means with a first threshold and actuate the switching means when the threshold is exceeded. With the same switching signal, further switching means can be actuated, which switch between the decoupling means.

Eine andere vorteilhafte Ausgestaltung sieht vor, daß in der signalverarbeitenden Anordnung zweite Vergleichsmittel vorgesehen sind, welche den am Eingang der signalverarbeitenden Anordnung auftretenden Signalpegel mit einer zweiten Schwelle vergleichen und bei Überschreiten der Schwelle die Schaltmittel betätigen. Während die ersten Vergleichsmittel gemäß dem ersten Ausführungsbeispiel vorzugsweise als schnell arbeitende diskrete Schaltungsanordnung realisiert sind, die gleichzeitig die weiteren Schaltmittel mit ausreichender Schnelligkeit schalten kann, sind die zweiten Vergleichsmittel gemäß dem anderen Ausführungsbeispiel vorzugsweise in einer Mikrorechnerschaltung realisiert, die den Vorteil aufweist, daß eine weiterhin erfindungsgemäß vorgesehene Verzögerung beim Abschalten der Schaltmittel ohne weiteren Aufwand in der Software der Mikroprozessoranordnung realisierbar ist.Another advantageous embodiment provides that second comparison means are provided in the signal processing arrangement, which compare the signal level occurring at the input of the signal processing arrangement with a second threshold and actuate the switching means when the threshold is exceeded. While the first comparison means according to the first embodiment are preferably implemented as a fast-working discrete circuit arrangement that can simultaneously switch the other switching means with sufficient speed, the second comparison means according to the other embodiment are preferably implemented in a microcomputer circuit, which has the advantage that a further Delay provided according to the invention when the switching means are switched off can be implemented in the software of the microprocessor arrangement without further effort.

Eine weitere Ausgestaltung sieht vor, daß der Arbeitswiderstand für die zweiten Entkopplungsmittel über dritte Entkopplungsmittel mit einem Stromversorgungsanschluß der Zündspulen und/oder der Stromversorgung der erfindungsgemäßen Vorrichtung und/oder mit einer Batterie verbindbar ist, die zur Stromversorgung der Zündanlage vorgesehen ist.A further embodiment provides that the load resistance for the second decoupling means can be connected via third decoupling means to a power supply connection of the ignition coils and / or the power supply of the device according to the invention and / or to a battery which is provided for supplying power to the ignition system.

Weitere vorteilhafte Weiterbildungen und Verbesserungen ergeben sich aus weiteren Unteransprüchen in Verbindung mit der folgenden Beschreibung.Further advantageous developments and improvements result from further subclaims in connection with the following description.

Zeichnungdrawing

In der Figur ist ein Blockschaltbild einer erfindungemäßen Vorrichtung zum Prüfen einer Zündanlage gezeigt.In the figure, a block diagram of an inventive device for testing an ignition system is shown.

In der Figur ist ein Blockschaltbild einer Zündanlage 10 gezeigt, die zwei Zündspulen 11, 12 enthält. Erste Primäranschlüsse 13, 14 der Zündspulen 11, 12 sind - gegebenenfalls über einen nicht gezeigten Zündschalter - mit einem ersten Anschluß 15 einer Energiequelle 16 verbunden, deren zweiter Anschluß 17 an eine Masse 18 geschaltet ist. Zweite Primäranschlüsse 19, 20 der Zündspulen 11, 12 sind mit einem Zündungsschaltgerät 21 verbunden, das nicht näher bezeichnete Zündungsschaltelemente enthält, die die zweiten Primäranschlüsse 19, 20 gegen Masse 18 schalten.In the figure, a block diagram of an ignition system 10 is shown, which contains two ignition coils 11, 12. First primary connections 13, 14 of the ignition coils 11, 12 are connected - possibly via an ignition switch (not shown) - to a first connection 15 of an energy source 16, the second connection 17 of which is connected to a ground 18. Second primary connections 19, 20 of the ignition coils 11, 12 are connected to an ignition switching device 21, which contains ignition switching elements, which are not identified in more detail, and which switch the second primary connections 19, 20 to ground 18.

Ein erster und zweiter Sekundäranschluß 22, 23 der Zündspule 11 führt jeweils zu Zündkerzen 24, 25, die gegen Masse 18 geschaltet sind. Ein erster Sekundäranschluß der Zündspule 12 ist mit dem zweiten Primäranschluß 20 verbunden, während ein zweiter Sekundäranschluß 27 mit einer weiteren Zündkerze 28 in Verbindung steht, die ebenfalls gegen Masse 18 geschaltet ist.A first and second secondary connection 22, 23 of the ignition coil 11 each lead to spark plugs 24, 25 which are connected to ground 18. A first secondary connection of the ignition coil 12 is connected to the second primary connection 20, while a second secondary connection 27 is connected to a further spark plug 28, which is also connected to ground 18.

Strichliniert abgetrennt von der Zündanlage 10 ist die erfindungsgemäße Prüfvorrichtung 30 zum Prüfen der Zündanlage 10 gezeichnet. Ein erster und zweiter Eingang 31, 32 der Prüfvorrichtung 30 ist über Anschlußstellen 33, 34 mit jeweils den zweiten Primäranschlüssen 19, 20 der Zündspulen 11, 12 verbindbar. Die beiden Eingänge 31, 32 sind jeweils mit ersten und zweiten Entkopplungsmitteln 35, 36; 37, 38 verbunden. Die ersten Entkopplungsmittel 35, 36 führen zu einer ersten Signalzusammenführungsstelle 39, während die zweiten Entkopplungsmittel 37, 38 zu einer zweiten Signalzusammenführungsstelle 40 führen. Die beiden Signalzusammenführungsstellen 39, 40 sind mit Schaltmittel 41 verbunden, die zwischen beiden Stellen 39, 40 auswählen. Ein Schaltmittelanschluß führt als Eingangssignal 42 zu einer signalverarbeitenden Anordnung 43, die strichliniert umrandet ist.The test device 30 according to the invention for testing the ignition system 10 is drawn in dashed lines separated from the ignition system 10. A first and second input 31, 32 of the test device 30 can be connected via connection points 33, 34 to the second primary connections 19, 20 of the ignition coils 11, 12, respectively. The two inputs 31, 32 are each provided with first and second decoupling means 35, 36; 37, 38 connected. The first decoupling means 35, 36 lead to a first signal combining point 39, while the second decoupling means 37, 38 lead to a second signal combining point 40. The two signal merging points 39, 40 are with Switching means 41 connected, select between the two points 39, 40. A switching means connection leads as an input signal 42 to a signal processing arrangement 43 which is surrounded by dashed lines.

Das Eingangssignal 42 gelangt in der signalverarbeitenden Anordnung zunächst in eine Eingangsanordnung 44, die einen gegen Masse 18 geschalteten Spannungsteiler 45 enthält. An einem Ausgang 46 der Eingangsanordnung 44 sind erste Vergleichsmittel 47 angeschlossen, die an eine erste Signalverzögerungsanordnung 48 ein Signal abgeben, die ihrerseits Schaltmittel 49 betätigt, die über einen Arbeitswiderstand 50 mit der zweiten Signalzusammenführungsstelle 40 verbunden sind.In the signal processing arrangement, the input signal 42 first arrives in an input arrangement 44 which contains a voltage divider 45 connected to ground 18. First comparison means 47 are connected to an output 46 of the input arrangement 44 and emit a signal to a first signal delay arrangement 48, which in turn actuates switching means 49 which are connected to the second signal combining point 40 via a load resistor 50.

An der ersten Signalzusammenführungstelle 39 sind zweite Vergleichsmittel 51 angeschlossen, denen weiterhin ein Eingangssignal zugeleitet ist, das vom ersten Anschluß 15 der Energiequelle 16 abgegriffen wird. Ein Ausgang 52 der zweiten Vergleichsmittel 51 betätigt die Schaltmittel 41 und gibt gleichzeitig ein Signal an eine zweite Signalverzögerungsanordung 53 ab, die die Schaltmittel 49 betätigt.Second comparison means 51 are connected to the first signal junction point 39, to which an input signal is also fed, which is tapped from the first connection 15 of the energy source 16. An output 52 of the second comparison means 51 actuates the switching means 41 and simultaneously outputs a signal to a second signal delay arrangement 53 which actuates the switching means 49.

Die Schaltmittel 49 sind über dritte Entkopplungsmittel 54, 55, 56 mit weiteren Schaltungspunkten verbunden. Das Entkopplungsmittel 55 ist am ersten Anschluß 15 der Energiequelle 16 angeschlossen. Das Entkopplungsmittel 54 führt zu einer nicht näher beschriebenen Stromversorgung 57 der erfindungsgemäßen Prüfvorrichtung 30. Das Entkopplungsmittel 55 führt zu den ersten Primäranschlüssen 13, 14 der Zündspulen 11, 12, sofern diese Primäranschlüsse vom ersten Anschluß 15 der Energiequelle 16 mit einem in der Figur nicht gezeigten Zündschalter trennbar sind.The switching means 49 are connected to further circuit points via third decoupling means 54, 55, 56. The decoupling means 55 is connected to the first connection 15 of the energy source 16. The decoupling means 54 leads to a power supply 57, not described in more detail, of the test device 30 according to the invention. The decoupling means 55 leads to the first primary connections 13, 14 of the ignition coils 11, 12, provided that these primary connections from the first connection 15 of the energy source 16 are not shown in the figure Ignition switches are separable.

Die erfindungsgemäße Prüfvorrichtung arbeitet folgendermaßen:
Die erfindungsgemäße Prüfvorrichtung 30 ermöglicht die Erfassung von Signalverläufen, die in der Zündanlage 10 auf der Primärseite der Zündspulen 11, 12 auftreten. Anstelle von vollständigen Signalverläufen sind auch Triggersignale aus der Zündanlage 10 ableitbar. Die Zündanlage 10 arbeitet mit einer ruhenden Hochspannungsverteilung. Mit dem Begriff "ruhende Hochspannungsverteilung" werden Zündanlagen 10 bezeichnet, die keine herkömmlichen Verteiler mehr aufweisen. Die Zündanlage 10 enthält deshalb mehr als eine Zündspule 10, 11, um mehrere Zündkerzen 24, 25, 28 von Mehrzylindermotoren in zeitlich versetzter Folge zünden zu können. Im Beispiel sind zwei Zündspulen 11, 12 gezeigt. Es können jedoch ohne weiteres weitere Zündspulen vorgesehen sein. Die Zündspulen 11, 12 sind beispielsweise herkömmliche Spulen, die bei Batterie- oder Transistorzündanlagen eingesetzt werden. Es können aber auch Spulen sein, die bei Thyristor- oder bei Hochfrequenzzündanlagen verwendet werden, die dort als Hochspannungstransformatoren bezeichnet werden.The test device according to the invention works as follows:
The test device 30 according to the invention enables the detection of signal profiles that occur in the ignition system 10 on the primary side of the ignition coils 11, 12. Instead of complete signal profiles, trigger signals can also be derived from the ignition system 10. The ignition system 10 works with a stationary high-voltage distribution. The term "static high-voltage distribution" designates ignition systems 10 which no longer have conventional distributors. The ignition system 10 therefore contains more than one ignition coil 10, 11 in order to be able to ignite a plurality of spark plugs 24, 25, 28 of multi-cylinder engines in a chronologically offset sequence. In the example, two ignition coils 11, 12 are shown. However, further ignition coils can easily be provided. The ignition coils 11, 12 are, for example, conventional coils which are used in battery or transistor ignition systems. But it can also be coils that are used in thyristor or high-frequency ignition systems, which are referred to as high-voltage transformers.

Die erfindungsgemäße Prüfvorrichtung 30 ist gleichermaßen auch zur Diagnose von Zündanlagen mit mehr als einer Zündspule und mit wenigstens einem Verteiler geeignet.The test device 30 according to the invention is equally suitable for diagnosing ignition systems with more than one ignition coil and with at least one distributor.

Die erfindungsgemäße Prüfvorrichtung 30 weist eine der Zündspulen 11, 12 entsprechende Anzahl von Eingängen 31, 32 auf, die mit den zweiten Anschlüssen 19, 20 der Zündspulen 11, 12 über die Anschlußstellen 33, 34 jeweils verbindbar sind. Die zweiten Primäranschlüssen 19, 20 sind mit Zündungsschaltelementen verbunden, die im Zündungsschaltgerät 21 untergebracht sind. Diese nicht näher gezeigten Zündungsschaltelemente verbinden zeitweise die zweiten Primäranschlüsse 19, 20 beispielsweise mit der Masse 18. Nach dem Öffnen der Zündungsschaltelemente entsteht auf der Sekundärseite der Zündspulen 11, 12 ein Hochspannungssignal zur Verfügung, das zum Zünden der Zündkerzen 24, 25, 28 führt. Weitere Bauelemente, die für die Erzeugung von Hochspannungsimpulsen benötigt werden, wie beispielsweise Kondensatoren auf der Primärseite, sind in der Figur nicht gezeigt, weil sie für die prinzipielle Funktion der erfindungsgemäßen Prüfvorrichtung keine Bedeutung haben.The test device 30 according to the invention has a number of inputs 31, 32 corresponding to the ignition coils 11, 12, which can be connected to the second connections 19, 20 of the ignition coils 11, 12 via the connection points 33, 34, respectively. The second primary connections 19, 20 are connected to ignition switching elements, which are accommodated in the ignition switching device 21. These ignition switching elements, not shown in detail, temporarily connect the second primary connections 19, 20 to ground 18, for example. After opening the ignition switching elements, a high-voltage signal is produced on the secondary side of the ignition coils 11, 12, which leads to the ignition of the spark plugs 24, 25, 28. Other components that are required for the generation of high-voltage pulses, such as for example, capacitors on the primary side are not shown in the figure because they have no significance for the basic function of the test device according to the invention.

Die Eingänge 31, 32 führen zu den beiden Entkopplungsmitteln 35, 36; 37, 38. Die Entkopplungsmittel sind Bauelemente, die eine Vorzugsrichtung für den elektrischen Strom aufweisen. Geeignet sind beispielsweise Dioden oder als Dioden geschaltete Transistoren. Die ersten Dioden 35, 36 fassen an der ersten Signalzusammenführungsstelle 39 ein an den Eingängen 31, 32 liegendes Signal zusammen, das bei der in der Figur gezeigten Diodenpolarität positives Potential gegenüber dem Potential an der ersten Stelle 39 aufweist. Ein spezieller Arbeitswiderstand für die ersten Dioden 35, 36 ist in der Schaltungsanordnung nicht vorgesehen. Ein Arbeitswiderstand ist beispielsweise durch eine Eingangsbeschaltung gegeben, die in den zweiten Vergleichsmitteln 51 angeordnet ist, oder durch die Eingangsanordnung 44 der signalverarbeitenden Anordnung 43 realisiert, die jeweils einen Strompfad, vorzugsweise gegen Masse 18, herstellen.The inputs 31, 32 lead to the two decoupling means 35, 36; 37, 38. The decoupling means are components which have a preferred direction for the electric current. For example, diodes or transistors connected as diodes are suitable. At the first signal combining point 39, the first diodes 35, 36 combine a signal at the inputs 31, 32, which has a positive potential compared to the potential at the first point 39 in the diode polarity shown in the figure. A special load resistance for the first diodes 35, 36 is not provided in the circuit arrangement. A load resistance is provided, for example, by an input circuit, which is arranged in the second comparison means 51, or by the input arrangement 44 of the signal processing arrangement 43, which each produce a current path, preferably against ground 18.

Die zweiten Dioden 37, 38 fassen an der zweiten Signalzusammenführungsstelle 40 die an den Eingängen 31, 32 liegenden Signale zusammen, die gegenüber der Stelle 40 negatives Potential aufweisen. Die zweiten Dioden 37, 38 sind über den Arbeitswiderstand 50 sowie über die Schaltmittel 49 an ein positives Potential gegenüber Masse 18 gelegt. Das positive Potential ist beispielsweise das am ersten Anschluß 15 der Energiequelle 16 der Zündanlage 10 abzugreifende Potential und/oder das aus der Stromversorgung 27 der Prüfvorrichtung 30 entnommene Potential und/oder ein an den ersten Primäranschlüssen 13, 14 der Zündspulen 11, 12 abgreifbares Potential. Diese Verbindung ist in der Figur nicht eingezeichnet. Sie kann insbesondere dann vorgesehen sein, wenn zwischen den ersten Primäranschlüssen 13, 14 und dem ersten Anschluß 15 der Energiequelle 16 ein in der Figur nicht gezeigter Zündschalter vorgesehen ist. Die alternative oder mehrfache Anbindung der zweiten Dioden 37, 38 an ein positives Potential gegenüber Masse 18 stellt in jedem Fall die Betriebsbereitschaft der Eingänge 31, 32 sicher, deren Signale über die zweiten Dioden 37, 38 in die signalverarbeitende Anordnung 43 gelangen. Zur Entkopplung sind die dritten Entkopplungsmittel 54, 55, 56 vorgesehen, die vorzugsweise als Dioden oder als Transistoren realisiert sind, die als Dioden geschaltet sind.At the second signal combining point 40, the second diodes 37, 38 combine the signals at the inputs 31, 32 which have a negative potential with respect to the point 40. The second diodes 37, 38 are connected to a positive potential with respect to ground 18 via the load resistor 50 and the switching means 49. The positive potential is, for example, the potential to be tapped at the first connection 15 of the energy source 16 of the ignition system 10 and / or the potential taken from the power supply 27 of the test device 30 and / or a potential which can be tapped at the first primary connections 13, 14 of the ignition coils 11, 12. This connection is not shown in the figure. It can be provided in particular if between the first primary connections 13, 14 and the first connection 15 of the energy source 16 an ignition switch, not shown in the figure, is provided. The alternative or multiple connection of the second diodes 37, 38 to a positive potential with respect to ground 18 ensures the operational readiness of the inputs 31, 32, the signals of which reach the signal processing arrangement 43 via the second diodes 37, 38. For the decoupling, the third decoupling means 54, 55, 56 are provided, which are preferably implemented as diodes or as transistors, which are connected as diodes.

An der ersten Signalzusammenführungsstelle 39 sind Signale der zweiten Primäranschlüsse 19, 20 der Zündspulen 11, 12 zusammengefaßt, die insbesondere während der Öffnungsphase der Zündungsschaltelemente auftreten. In dieser Phase liegen der Zündvorgang, die Funkenbrenndauer, allgemein die Öffnungszeit der Zündungsschaltelemente. An der zweiten Signalzusammenführungsstelle 40 werden insbesondere die Signale zusammengefaßt, die während der Schließzeit der Zündungsschaltelemente auftreten. Während dieser Zeit sind die zweiten Primäranschlüsse 19, 20 der Zündspulen 11, 12 über die Zündungsschaltelemente an Masse 18 geschaltet, so daß in dieser Phase ein Primärstrom auf den Primärseiten 11, 12 aufgebaut werden kann.At the first signal combining point 39, signals from the second primary connections 19, 20 of the ignition coils 11, 12 are combined, which occur in particular during the opening phase of the ignition switching elements. It is in this phase that the ignition process, the spark duration, and generally the opening time of the ignition switching elements. In particular, the signals that occur during the closing time of the ignition switching elements are combined at the second signal combining point 40. During this time, the second primary connections 19, 20 of the ignition coils 11, 12 are connected to ground 18 via the ignition switching elements, so that a primary current can be built up on the primary sides 11, 12 in this phase.

Die Schaltmittel 41 ermöglichen die Auswahl einer der beiden Signalzusammenführungsstellen 39, 40, die mit der signalverarbeitenden Anordnung 43 verbunden werden. Die Schaltmittel 41 sind vorzugsweise als elektronischer Umschalter realisiert. Die Umschaltung könnte prinzipiell manuell erfolgen. Die Diagnose wäre dann auf die längere Betrachtung der an der ersten Stelle 39, und nach dem Umschalten, der an der Stelle 40 liegenden Signale abgestellt. Vorzugsweise wird der Umschalter 41 von den zweiten Vergleichsmitteln 51 betätigt, die das an der ersten Stelle 39 liegende Potential mit einem Schwellwert vergleichen, der im folgenden mit Hinblick auf einen ersten Schwellwert in den ersten Vergleichsmitteln 47 als zweiter Schwellwert bezeichnet wird. Der zweite Schwellwert liegt beispielsweise mindestens auf dem Potential auf dem der Anschluß 15 der Energiequelle 16 liegt. Vorzugsweise wird der zweite Schwellwert auf einen höheren Wert festgelegt, bei dem zusätzlich Durchlaßspannungen von Halbleiterbauelementen und von Schutzschaltungen, die nicht näher ausgeführt sind, berücksichtigt sind. Bei einer Spannung der Energiequelle 16 von beispielsweise 12 V wird die zweite Schwelle beispielsweise auf ca. 20 V festgelegt. Überschreitet das Potential an der ersten Stelle 39 die zweite Schwelle, so betätigen die zweiten Vergleichsmittel 51 den Umschalter 41 derart, daß er die erste Stelle 39 mit dem Eingang 42 der signalverarbeitenden Anordnung 43 verbindet. Liegt das Potential an der ersten Stelle 39 darunter, so ist der Umschalter 41 an die zweite Stelle 40 gelegt.The switching means 41 enable the selection of one of the two signal combining points 39, 40 which are connected to the signal processing arrangement 43. The switching means 41 are preferably implemented as an electronic switch. The switchover could in principle be done manually. The diagnosis would then be based on the longer observation of the signals located at the first point 39 and after switching over, the signals located at the point 40. The changeover switch 41 is preferably actuated by the second comparison means 51, which compare the potential at the first point 39 with a threshold value, which in the following with reference to a first threshold value in the first comparison means 47 is referred to as the second threshold. The second threshold value is, for example, at least at the potential at which the connection 15 of the energy source 16 lies. The second threshold value is preferably set to a higher value, in which additional forward voltages of semiconductor components and of protective circuits, which are not detailed, are taken into account. At a voltage of the energy source 16 of, for example, 12 V, the second threshold is set to approximately 20 V, for example. If the potential at the first point 39 exceeds the second threshold, the second comparison means 51 actuate the changeover switch 41 in such a way that it connects the first point 39 to the input 42 of the signal processing arrangement 43. If the potential at the first point 39 is below, the changeover switch 41 is placed at the second point 40.

Der Ausgang 52 der zweiten Vergleichsmitteln 51 führt weiterhin zu der Signalverzögerungsanordnung 53, die die Schaltmittel 49 betätigt. Die Schaltmittel 49 sind vorzugsweise ein elektronischer Schalter, der beispielsweise als Transistor realisiert ist. Das am Ausgang 52 auftretende Signal das den Umschalter 41 betätigt, kann auch zur Betätigung des Schalters 49 herangezogen werden. Sobald das Potential an der Stelle 39 den zweiten Schwellwert übersteigt, ist zweite Schalter 49 geschlossen. Nach Unterschreiten der zweiten Schwelle sorgt die zweite Signalverzögerungsanordnung 53 für eine vorgebbare Zeit dafür, daß der Schalter 49 noch geschlossen bleibt. Die Zeit ist beispielsweise derart festgelegt, daß bei der Prüfung der Zündanlage 10 eines sehr langsam laufenden Einzylindermotors der Schalter 49 geschlossen bleibt.The output 52 of the second comparison means 51 also leads to the signal delay arrangement 53, which actuates the switching means 49. The switching means 49 are preferably an electronic switch, which is implemented, for example, as a transistor. The signal occurring at the output 52 which actuates the changeover switch 41 can also be used to actuate the switch 49. As soon as the potential at point 39 exceeds the second threshold value, second switch 49 is closed. After falling below the second threshold, the second signal delay arrangement 53 ensures that the switch 49 remains closed for a predeterminable time. The time is set, for example, such that switch 49 remains closed when testing ignition system 10 of a very slow-running single-cylinder engine.

Mit dem Schalter 49 ist der Arbeitswiderstand der zweiten Dioden 37, 38 mit positivem Potential verbindbar in Abhängigkeit von dem an den ersten Dioden 35, 36 auftretenden Signalpegel. Diese Maßnahme erweist sich in bestimmten Betriebszuständen besonders zweckmäßig. Bei ständig mit positivem Potential verbundenem Arbeitswiderstand 50 würde beispielsweise bei offenen Eingängen 31, 32 an der zweiten Signalzusammenführungsstelle 40 ständig positives Potential anliegen. An der nachfolgenden signalverarbeitenden Anordnung 43, an deren Eingang 42 auch weitere, in der vorliegenden Beschreibung nicht näher beschriebene Meßgeräte anschließbar sind, könnte ein scheinbares Signal oder ein scheinbarer Meßwert anliegen, der etwa dem positiven Potential am Arbeitswiderstand 50 entspricht.The load resistance of the second diodes 37, 38 with positive potential can be connected to the switch 49 as a function of the signal level occurring at the first diodes 35, 36. This measure proves to be particularly useful in certain operating states. If the working resistance 50 was permanently connected to a positive potential, for example with open inputs 31, 32 the positive signal potential would always be present at the second signal combining point 40. An apparent signal or an apparent measured value, which corresponds approximately to the positive potential at the load resistor 50, could be present at the subsequent signal-processing arrangement 43, at the input 42 of which further measuring devices not described in the present description can be connected.

In einem anderen Ausführungsbeispiel schalten die zweiten Vergleichsmittel 51 lediglich den Umschalter 41. Die Betätigung des Schalters 49 wird von der signalverarbeitenden Anordnung 43 aus vorgenommen. Zur Durchführung dieser Aufgabe enthält die Anordnung 43 die ersten Vergleichsmittel 41, die das Potential am Spannungsteiler 45 mit einer ersten Schwelle vergleichen. Die erste Schwelle könnte nach denselben Kriterien wie die zweite Schwelle festgelegt sein. Auch die erste Schwelle sollte derart festgelegt sein, daß sichergestellt ist, daß der Schalter 49 nur dann geschlossen wird, wenn an der ersten Signalzusammenführungsstelle 39 ein ausreichend hohes Potential auftritt. Die ersten Vergleichsmittel 47 sind in der Figur am Ausgang 46 des Spannungsteilers 45 angeschlossen. Es ist ebenso möglich, die ersten Vergleichsmittel 47 direkt am Eingang 42 vorzusehen. Die erste Schwelle wird vorzugsweise ebenfalls auf ein Potential festgelegt, das über dem an am ersten Anschluß 15 der Energiequelle 16 liegenden Potential liegt. Die Schwelle kann bei einer 12 Volt Energieversorgung beispielsweise zwischen 20 V und ca. 100 V liegen. Derartig hohe Spannungswerte liegen in der signalverarbeitenden Anordnung 43 nicht mehr vor, weil der gegebenenfalls vorgesehene Spannungsteiler 45 eine Reduzierung bewirkt. Ferner ist die signalverarbeitende Anordnung 43 bis auf den Spannungsteiler 45 vorzugweise in einem Mikroprozessorsystem realisiert, das anstelle von absoluten Spannungen mit Zahlen arbeitet. Die erste Schwelle kann deshalb auf einen internen Wert festgelegt sein, der auf den Eingang 42 bezogen ist.In another exemplary embodiment, the second comparison means 51 merely switch the changeover switch 41. The switch 49 is actuated by the signal processing arrangement 43. To perform this task, the arrangement 43 contains the first comparison means 41, which compare the potential at the voltage divider 45 with a first threshold. The first threshold could be set according to the same criteria as the second threshold. The first threshold should also be set such that it is ensured that the switch 49 is only closed when a sufficiently high potential occurs at the first signal merging point 39. The first comparison means 47 are connected in the figure to the output 46 of the voltage divider 45. It is also possible to provide the first comparison means 47 directly at the input 42. The first threshold is preferably also set to a potential that lies above the potential at the first connection 15 of the energy source 16. The threshold can be, for example, between 20 V and 12 V for a power supply approx. 100 V. Such high voltage values are no longer present in the signal processing arrangement 43 because the voltage divider 45, if provided, brings about a reduction. Furthermore, the signal processing arrangement 43, with the exception of the voltage divider 45, is preferably implemented in a microprocessor system which works with numbers instead of absolute voltages. The first threshold can therefore be set to an internal value that relates to the input 42.

Der Ausgang der ersten Vergleichsmittel 47 betätigt über die erste Signalverzögerungsanordnung 48 den Schalter 49. Anstelle der zweiten Signalverzögerungsanordnung 43 gemäß dem ersten Ausführungsbeispiel ist die zweite Signalverzögerungsordnung 48 vorgesehen, die dieselbe Aufgabe hat wie diejenige im ersten Beispiel. Im zweiten Ausführungsbeispiel sind weiterhin vorzugsweise die zweiten Vergleichsmittel 51 vorgesehen, die eine schnelle Umschaltung des ersten Umschalters 41 gestatten.The output of the first comparison means 47 actuates the switch 49 via the first signal delay arrangement 48. Instead of the second signal delay arrangement 43 according to the first exemplary embodiment, the second signal delay arrangement 48 is provided, which has the same task as that in the first example. In the second exemplary embodiment, the second comparison means 51 are furthermore preferably provided, which allow the first switch 41 to be switched over quickly.

Claims (7)

Vorrichtung zum Prüfen einer Zündanlage, die mehr als eine Zündspule enthält, mit ersten Entkopplungsmitteln vorgegebener Durchlaßrichtungen, die jeweils mit ersten primären Anschlüssen der Zündspulen verbindbar sind und die Signale an einer ersten Stelle zusammenführen, mit zweiten Entkopplungsmitteln entgegengesetzter Durchlaßrichtungen, die jeweils mit den zweiten primären Anschlüssen verbindbar sind und die Signale an einer zweiten Stelle zusammenführen, mit ersten Schaltmitteln, die eine signalverarbeitende Anordnung mit der ersten Signalzusammenführungsstelle oder mit der zweiten Signalzusammenführungsstelle verbinden, dadurch gekennzeichnet, daß eine Reihenschaltung aus einem Arbeitswiderstand (50) für die zweiten Entkopplungsmittel (37, 38) und Schaltmitteln (49) vorgesehen ist und daß die Schaltmittel (49) in Abhängigkeit von dem an der ersten Signalzusammenführungsstelle (39) auftretenden Potential betätigt werden.Device for testing an ignition system, which contains more than one ignition coil, with first decoupling means of predetermined pass directions, each of which can be connected to first primary connections of the ignition coils and which bring the signals together at a first point, with second decoupling means of opposite pass directions, each with the second primary Connections can be connected and the signals are brought together at a second point, with first switching means which connect a signal processing arrangement to the first signal combining point or to the second signal combining point, characterized in that a series circuit comprising a load resistor (50) for the second decoupling means (37, 38) and switching means (49) is provided and that the switching means (49) are actuated as a function of the potential occurring at the first signal combining point (39). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß erste Vergleichsmittel (47) in der signalverarbeitenden Anordnung (43) ein Eingangssignal (42) der Anordnung (43) mit einer ersten Schwelle vergleichen und die Schaltmittel (49) in Abhängigkeit vom Ergebnis des Vergleichs betätigen.Device according to claim 1, characterized in that first comparison means (47) in the signal processing arrangement (43) compare an input signal (42) of the arrangement (43) with a first threshold and actuate the switching means (49) depending on the result of the comparison. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zweite Vergleichsmittel (51) vorgesehen sind, welche das an der ersten Signalzusammenführungsstelle (39) liegende Potential mit einer zweiten Schwelle vergleichen und in Abhängigkeit vom Ergebnis die Schaltmittel (49) betätigen.Device according to claim 1 or 2, characterized in that second comparison means (51) are provided which compare the potential at the first signal combining point (39) with a second threshold and actuate the switching means (49) depending on the result. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Ausgangssignal (52) der zweiten Vergleichsmittel (51) die Schaltmittel (42) in Abhängigkeit vom Ergebnis des Vergleichs betätigen.Device according to one of the preceding claims, characterized in that the output signal (52) of the second comparison means (51) actuate the switching means (42) depending on the result of the comparison. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Signal zum Betätigen der Schaltmittel (49) über eine Signalverzögerungsanordnung (48, 53) geführt ist, die ein verzögertes Abschalten der Schaltmittel (49) bewirkt.Device according to one of the preceding claims, characterized in that the signal for actuating the switching means (49) is guided via a signal delay arrangement (48, 53) which causes the switching means (49) to be switched off with a delay. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Arbeitswiderstand (50) über dritte Entkopplungsmittel (54, 55, 56) mit einer Stromversorgung (57) der Prüfvorrichtung (30) und/oder mit einem ersten Anschluß (15) einer Energiequelle (16) der Zündanlage (10) und/oder mit ersten Primäranschlüssen (13, 14) der Zündspulen (11) verbindbar ist.Device according to one of the preceding claims, characterized in that the load resistor (50) via third decoupling means (54, 55, 56) with a power supply (57) for the test device (30) and / or with a first connection (15) of an energy source ( 16) of the ignition system (10) and / or with first primary connections (13, 14) of the ignition coils (11). Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Entkopplungsmittel (35, 36; 37, 38; 54, 55, 56) Dioden sind.Device according to one of the preceding claims, characterized in that the decoupling means (35, 36; 37, 38; 54, 55, 56) are diodes.
EP91119498A 1991-01-21 1991-11-15 Testing device of ignition installation Expired - Lifetime EP0496050B1 (en)

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DE4101574A DE4101574A1 (en) 1991-01-21 1991-01-21 DEVICE FOR TESTING A IGNITION SYSTEM
DE4101574 1991-01-21

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EP0496050A2 true EP0496050A2 (en) 1992-07-29
EP0496050A3 EP0496050A3 (en) 1994-02-16
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DE3841739A1 (en) * 1988-12-10 1990-06-13 Bosch Gmbh Robert Device for detecting ignition signals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105351136A (en) * 2015-11-25 2016-02-24 昆山凯迪汽车电器有限公司 Ignition coil field intensity induction type detecting system

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EP0496050B1 (en) 1996-04-24
DE59107728D1 (en) 1996-05-30
ES2086456T3 (en) 1996-07-01
DE4101574A1 (en) 1992-07-23
ATE137305T1 (en) 1996-05-15
EP0496050A3 (en) 1994-02-16

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