EP0561807B1 - Signal-acquisition device - Google Patents
Signal-acquisition device Download PDFInfo
- Publication number
- EP0561807B1 EP0561807B1 EP91919778A EP91919778A EP0561807B1 EP 0561807 B1 EP0561807 B1 EP 0561807B1 EP 91919778 A EP91919778 A EP 91919778A EP 91919778 A EP91919778 A EP 91919778A EP 0561807 B1 EP0561807 B1 EP 0561807B1
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- Prior art keywords
- ignition
- circuit arrangement
- signal
- arrangement
- capacitive
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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
- F02P17/12—Testing characteristics of the spark, ignition voltage or current
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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
- F02P2017/006—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines using a capacitive sensor
Definitions
- the invention relates to a device for detecting signals according to the preamble of the main claim.
- a device for detecting signals according to the preamble of the main claim.
- Such a device is known from DE-U-8.910.945.
- a device for determining the ignition pulse provided for a specific cylinder of an internal combustion engine is known from US Pat. No. 4,795,979.
- the ignition system contains several ignition coils, two spark plugs each being connected to the secondary windings of the ignition coils.
- This distributorless ignition system generates an ignition spark on each spark plug with each revolution of the internal combustion engine.
- ignition sparks are therefore generated both in the working cycle and in the exhaust cycle.
- three capacitive signal decouplings are provided, which are arranged on the ignition cables leading from the ignition coils to the spark plugs.
- the known device requires the accessibility of the ignition cable for attaching the sensors. The decoupled signals go to different signal evaluation circuits.
- the invention has for its object to provide a simple device with little wiring for diagnosing multi-coil ignition systems.
- the device according to the invention for detecting signals on an ignition coil system which contains more than one ignition coil has the advantage of simple adaptation. It is particularly advantageous that conventional ignition cables no longer have to be present between the ignition coils and the spark plugs.
- the means for capacitive signal decoupling are suitably arranged directly on the ignition coils or on the housings that contain the ignition coils.
- the circuit arrangement provided according to the invention for merging the decoupled signals reduces the wiring effort. Only connections between the capacitive signal decoupling and the circuit arrangement are required, from where only a single further line can be provided. The circuit arrangement must be arranged in the immediate vicinity of the ignition system, so that a short line routing, in particular of the individual lines leading to the capacitive signal decoupling, is possible.
- the means for capacitive signal decoupling provide signals that correspond to the high voltage at the ignition coils. These signals are combined in the circuit arrangement and can be analyzed in a further diagnostic device.
- the device according to the invention is suitable for diagnosis on multi-coil ignition systems, the connection of the secondary windings of the ignition coils being arbitrary. For example, secondary windings grounded on one side with a high-voltage connection and arrangements with spark plug connections can be provided at both ends of the secondary windings.
- further capacitive couplings are provided between the means for capacitive signal coupling and the circuit arrangement for merging the decoupled signals.
- the main advantage of these further capacitive couplings lies in the potential separation between the means for capacitive signal decoupling and the further circuit arrangement.
- An adaptation error that is only present on an ignition coil or on an ignition coil housing, for example a short circuit to ground, does not affect the other detected signals.
- the further diagnostic device can be designed in such a way that the defective or incorrectly connected means for capacitive signal decoupling can be identified.
- At least one adjustment element is arranged in the circuit arrangement for calibrating the level of the signal which can be tapped at the output of the circuit arrangement. It is particularly advantageous if adjustment means for calibrating the signal level are assigned to the individual means for capacitive signal extraction. With this measure, the signals emitted by differently designed means for capacitive signal coupling can be calibrated. The signals are then directly comparable in terms of the signal level.
- voltage limiters are advantageously provided at the inputs of the circuit arrangement.
- FIG. 1 shows a sketch of a device according to the invention for detecting signals on an ignition system and FIG. 2 shows an equivalent circuit diagram.
- FIG. 1 shows an ignition system which contains two ignition coils 11, 12.
- An equivalent circuit diagram 13, 14 of the ignition coil 11, 12 is shown in the ignition coils 11, 12.
- Primary connections 15, 16; 17, 18 of the ignition coils 11, 12 lead to ignition switching devices, not shown in FIG. 1.
- a secondary connection 19, 20 of a secondary winding 21, 22 leads to a high-voltage connection 23, 24.
- Means 25, 26 for capacitive signal coupling are respectively arranged on the ignition coils 11, 12.
- the capacitive coupling is illustrated in each case by a capacitor 27, 28. Since the capacitor 27, 28 is not present as a separate component, it was entered in broken lines in FIG. 1.
- the means 25 assigned to the ignition coil 11 is connected via a balancing arrangement 29 and a connecting line 30 and via a plug connection 31 to a circuit arrangement 32 which has an output 33.
- the means 26 assigned to the ignition coil 12 is connected to the circuit arrangement 32 via a plug connection 34, a connecting line 35 and a plug connection 36.
- FIG. 2 shows an equivalent circuit diagram of the device shown schematically in FIG. 1. Those parts shown in FIG. 2 which correspond to the parts shown in FIG. 1 have the same reference numbers as in FIG. 1.
- the circuit arrangement 32 contains voltage-limiting elements, each consisting of two diodes 37, 38; 39, 40 are composed.
- the voltage-limiting elements 37, 38; 39, 40 are each between Input lines 41, 42 of the circuit arrangement 32 and a ground 43 are connected.
- a resistor 44 and a capacitor 45 are connected in parallel with the output 33.
- the inputs 41, 42 are each connected to the output 33 via capacitors 46, 47.
- the output 33 leads to a further diagnostic device 48.
- the device according to the invention works as follows:
- the ignition system 10 contains a plurality of ignition coils 11, 12, which are provided, for example, for the staggered ignition of a plurality of cylinders of an internal combustion engine.
- a conventional distributor is no longer available.
- connecting lines between the ignition coils 11, 12 and spark plugs are no longer accessible.
- the spark plugs are connected there directly to the high-voltage connections 23, 24.
- the means 25, 26 for capacitive signal decoupling are provided according to the invention.
- the means 25, 26 are preferably designed as plug-on parts which can have special shapes for adaptation to different ignition coils 11, 12.
- the capacitive coupling between the means 25, 26 and the secondary windings 21, 22 of the ignition coils 11, 12 is illustrated by the coupling capacitor 27, 28, which is not provided as a separate component.
- a coupling also takes place to the primary side of the ignition coils 11, 12.
- the voltages occurring in the secondary winding 21, 22 are generally many times higher than those on the primary side, so that the voltage coupled into the means 25, 26 is always a measure of the voltage occurring at the ignition coils 11, 12 on the secondary side .
- the signals capacitively coupled out by the means 25, 26 are combined in the circuit arrangement 32.
- the means 25, 26 can be connected to the arrangement 32 via connecting lines 30, 35 and via plug connections 31, 36.
- the plug connections 31, 36 can be omitted.
- the circuit diagram shown in FIG. 2 shows the signal merging in the circuit arrangement 32.
- capacitors 46, 47 are provided for potential isolation. With this measure it is achieved that a faulty adaptation of a means 25, 26 does not lead to failure of the entire arrangement. Protection is given in particular against a short circuit of one of the means 25, 26 against ground 43.
- the capacitors 46, 47 avoid a time-consuming search for the means 25, 26 which are short-circuited to ground.
- the diagnostic device 48 which further analyzes the signals brought together at the output 33, makes it easy to identify the incorrectly connected means 25, 26 on the basis of a time-related representation of the signals.
- the circuit arrangement 32 contains voltage-limiting means 37, 38; 39, 40.
- Fast limiter diodes 37, 38; are particularly suitable here.
- 39, 40 which are connected to ground 43 at the inputs 42, 41, respectively.
- the diodes 37, 38; 39, 40 shown as series connections with different polarizations of the diodes 37, 38; 39, 40. In principle, other circuits are also suitable.
- the voltage-limiting means 37, 38; 39, 40 may be provided in the alignment arrangement 29. With this arrangement of the means 37, 38; 39, 40 dangerously high voltages are suppressed close to the source. Capacitive signal couplings in the subsequent circuit arrangements 32 and between lines 30, 35 are minimized.
- the capacitor 45 which is designed as a balancing element with variable capacitance.
- the capacitor 45 forms a voltage divider with the replacement capacitors 27, 28 shown in FIG.
- the relatively high division ratio which must reduce the voltages in the kV range at the ignition coils 11, 12 to values that can be easily further processed, leads to a relatively high capacitance value of the capacitor 45, so that the variable capacitance of this capacitor 45 is preferably due to parallel and / or series connections from several capacitors is to be simulated.
- the adaptation or calibration with the capacitor 45 simultaneously affects the signals at the inputs 41, 42.
- An individual calibration of the individual means 25, 26 is possible with the adjustment arrangement 29, which is assigned to the corresponding means 25, 26.
- the adjustment arrangement 29 is structurally combined with the means 25, 26, for example. It contains a matching circuit, not shown in the figures, which preferably also contains a capacitive voltage divider. The adjustment arrangement 29 can advantageously also be accommodated in the circuit arrangement 32.
- plug connections 34 on the means 25, 26 Another embodiment provides for the use of plug connections 34 on the means 25, 26.
- the adjustment arrangement 29 is preferably integrated in the plug connection 34.
- the plug connection 34 enables the means 25, 26 to be exchanged quickly.
- the connecting lines 30, 35 present between the means 25, 26 and the circuit arrangement 32 can be single-core lines. Shielded lines 30 are preferably provided, which reduce interference signal coupling. The cable capacity in the shielded cables can easily be taken into account when calibrating the entire arrangement.
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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)
Abstract
Description
Die Erfindung geht aus von einer Vorrichtung zum Erfassen von Signalen nach der Gattung des Hauptanspruchs. Eine solche Vorrichtung ist aus der DE-U-8.910.945 bekannt.The invention relates to a device for detecting signals according to the preamble of the main claim. Such a device is known from DE-U-8.910.945.
Aus der US-PS 4 795 979 ist eine Vorrichtung zur Ermittlung des für einen bestimmten Zylinder einer Brennkraftmaschine vorgesehenen Zündimpulses bekannt. Die Zündanlage enthält mehrere Zündspulen, wobei an den Sekundärwicklungen der Zündspulen jeweils zwei Zündkerzen angeschlossen sind. Diese verteilerlose Zündanlage erzeugt bei jeder Umdrehung der Brennkraftmaschine einen Zündfunken an jeder Zündkerze. Bei Viertakt-Brennkraftmaschinen werden demnach Zündfunken sowohl im Arbeitstakt als auch im Auslaßtakt erzeugt. Zur Diagnose dieser Zündanlage sind drei kapazitive Signalauskopplungen vorgesehen, die an den von den Zündspulen zu den Zündkerzen führenden Zündkabeln angeordnet sind. Die bekannte Vorrichtung setzt die Zugänglichkeit der Zündkabel zum Anbringen der Sensoren voraus. Die ausgekoppelten Signale gelangen in unterschiedliche Signalauswerteschaltungen.A device for determining the ignition pulse provided for a specific cylinder of an internal combustion engine is known from US Pat. No. 4,795,979. The ignition system contains several ignition coils, two spark plugs each being connected to the secondary windings of the ignition coils. This distributorless ignition system generates an ignition spark on each spark plug with each revolution of the internal combustion engine. In four-stroke internal combustion engines, ignition sparks are therefore generated both in the working cycle and in the exhaust cycle. For the diagnosis of this ignition system, three capacitive signal decouplings are provided, which are arranged on the ignition cables leading from the ignition coils to the spark plugs. The known device requires the accessibility of the ignition cable for attaching the sensors. The decoupled signals go to different signal evaluation circuits.
Aus der US-PS 3 959 725 ist es bekannt, einen kapazitiven Zündspannungssensor an einem Verteilergehäuse anzuordnen, das neben dem Verteiler auch die Zündspule enthält. Die kapazitive Signalauskopplung erfolgt mit einer elektrisch leitenden Fläche, die in geeigneter Weise an dem Verteiler befestigt ist. Diese bekannte Vorrichtung ist auf die Diagnose von einer Einspulen-Zündanlage abgestellt.From US Pat. No. 3,959,725 it is known to arrange a capacitive ignition voltage sensor on a distributor housing which also contains the ignition coil in addition to the distributor. The capacitive signal is decoupled with an electrically conductive surface which is attached to the distributor in a suitable manner. This known device is based on the diagnosis of a single-coil ignition system.
Der Erfindung liegt die Aufgabe zugrunde, eine einfache Vorrichtung mit geringem Verkabelungsaufwand zur Diagnose von Mehrspulen-Zündanlagen anzugeben.The invention has for its object to provide a simple device with little wiring for diagnosing multi-coil ignition systems.
Diese Aufgabe wird durch die im Hauptanspruch angegebenen Merkmale gelöst.This object is achieved by the features specified in the main claim.
Die erfindungsgemäße Vorrichtung zum Erfassen von Signalen an einer Zündspulenanlage, die mehr als eine Zündspule enthält, weist den Vorteil einer einfachen Adaption auf. Besonders vorteilhaft ist es, daß zwischen den Zündspulen und den Zündkerzen herkömmliche Zündkabel nicht mehr vorhanden sein müssen. Die Mittel zur kapazitiven Signalauskopplung werden in geeigneter Weise unmittelbar an den Zündspulen oder an den Gehäusen, die die Zündspulen enthalten, angeordnet. Die weiterhin erfindungsgemäß vorgesehene Schaltungsanordnung zum Zusammenführen der ausgekoppelten Signale reduziert den Verkabelungsaufwand. Es sind lediglich Verbindungen zwischen den kapazitiven Signalauskopplungen und der Schaltungsanordnung erforderlich, von wo aus lediglich eine einzige weiterführende Leitung vorgesehen sein kann. Die Schaltungsanordnung ist in unmittelbarer Nähe der Zündanlage anzuordnen, so daß eine kurze Leitungsführung, insbesondere der einzelnen, zu den kapazitiven Signalauskopplungen führenden Leitungen, möglich ist.The device according to the invention for detecting signals on an ignition coil system which contains more than one ignition coil has the advantage of simple adaptation. It is particularly advantageous that conventional ignition cables no longer have to be present between the ignition coils and the spark plugs. The means for capacitive signal decoupling are suitably arranged directly on the ignition coils or on the housings that contain the ignition coils. The circuit arrangement provided according to the invention for merging the decoupled signals reduces the wiring effort. Only connections between the capacitive signal decoupling and the circuit arrangement are required, from where only a single further line can be provided. The circuit arrangement must be arranged in the immediate vicinity of the ignition system, so that a short line routing, in particular of the individual lines leading to the capacitive signal decoupling, is possible.
Die Mittel zur kapazitiven Signalauskopplung stellen Signale bereit, die der Hochspannung an den Zündspulen jeweils entsprechen. Diese Signale werden in der Schaltungsanordnung zusammengeführt und können in einer weiteren Diagnosevorrichtung analysiert werden. Die erfindungsgemäße Vorrichtung ist zur Diagnose an Mehrspulen-Zündanlagen geeignet, wobei die Beschaltung der Sekundärwicklungen der Zündspulen beliebig ist. Beispielsweise können einseitig geerdete Sekundärwicklungen mit einem Hochspannungsanschluß als auch Anordnungen mit Zündkerzenanschlüssen an beiden Enden der Sekundärwicklungen vorgesehen sein.The means for capacitive signal decoupling provide signals that correspond to the high voltage at the ignition coils. These signals are combined in the circuit arrangement and can be analyzed in a further diagnostic device. The device according to the invention is suitable for diagnosis on multi-coil ignition systems, the connection of the secondary windings of the ignition coils being arbitrary. For example, secondary windings grounded on one side with a high-voltage connection and arrangements with spark plug connections can be provided at both ends of the secondary windings.
Gemäß der Erfindung sind zwischen den Mitteln zur kapazitiven Signalkopplung und der Schaltungsanordnung zum Zusammenführen der ausgekoppelten Signale jeweils weitere kapazitive Kopplungen vorgesehen. Der wesentliche Vorteil dieser weiteren kapazitiven Kopplungen liegt in der Potentialtrennung zwischen den Mitteln zur kapazitiven Signalauskopplung und der weiteren Schaltungsanordnung. Ein Adaptionsfehler, der nur an einer Zündspule oder an einem Zündspulengehäuse vorliegt, beispielsweise ein Kurzschluß gegen Masse, beeinflußt die anderen erfaßten Signale nicht. Die weitere Diagnoseinrichtung kann derart ausgestaltet sein, daß das defekte oder falsch angeschlossene Mittel zur kapazitiven Signalauskopplung identifizierbar ist.According to the invention, further capacitive couplings are provided between the means for capacitive signal coupling and the circuit arrangement for merging the decoupled signals. The main advantage of these further capacitive couplings lies in the potential separation between the means for capacitive signal decoupling and the further circuit arrangement. An adaptation error that is only present on an ignition coil or on an ignition coil housing, for example a short circuit to ground, does not affect the other detected signals. The further diagnostic device can be designed in such a way that the defective or incorrectly connected means for capacitive signal decoupling can be identified.
Vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Vorrichtung ergeben sich aus Unteransprüchen.Advantageous further developments and improvements of the device specified in the main claim result from subclaims.
Eine vorteilhafte Weiterbildung sieht vor, daß in der Schaltungsanordnung wenigstens ein Abgleichelement angeordnet ist zum Kalibrieren des Pegels des am Ausgang der Schaltungsanordnung abgreifbaren Signals. Insbesondere vorteilhaft ist es, wenn den einzelnen Mitteln zur kapazitiven Signalauskopplung Abgleichmittel zur Kalibrierung des Signalpegels zugeordnet sind. Mit dieser Maßnahme sind die von unterschiedlich ausgestalteten Mitteln zur kapazitiven Signalkopplung abgegebenen Signale kalibrierbar. Die Signale sind dann bezüglich des Signalpegels unmittelbar vergleichbar.An advantageous further development provides that at least one adjustment element is arranged in the circuit arrangement for calibrating the level of the signal which can be tapped at the output of the circuit arrangement. It is particularly advantageous if adjustment means for calibrating the signal level are assigned to the individual means for capacitive signal extraction. With this measure, the signals emitted by differently designed means for capacitive signal coupling can be calibrated. The signals are then directly comparable in terms of the signal level.
Zum Schutz gegen hohe Berührungsspannungen sind vorteilhafterweise an den Eingängen der Schaltungsanordnung Spannungsbegrenzer vorgesehen.To protect against high contact voltages, voltage limiters are advantageously provided at the inputs of the circuit arrangement.
Eine leichte Handhabbarkeit der Mittel zur kapazitiven Signalkopplung ist durch eine Ausgestaltung als Ansteckteile möglich. Zweckmäßig ist es, an den Mitteln Steckverbindungen vorzusehen, die einen schnellen Austausch ermöglichen.An easy handling of the means for capacitive signal coupling is possible through a design as plug-on parts. It is expedient to provide plug connections on the means which enable a quick exchange.
Weitere vorteilhafte Weiterbildungen und Verbesserungen der erfindungsgemäßen Vorrichtung ergeben sich aus weiteren Unteransprüchen in Verbindung mit der folgenden Beschreibung.Further advantageous developments and improvements of the device according to the invention result from further subclaims in connection with the following description.
Figur 1 zeigt eine Skizze einer erfindungsgemäßen Vorrichtung zum Erfassen von Signalen an einer Zündanlage und Figur 2 zeigt ein Ersatzschaltbild.FIG. 1 shows a sketch of a device according to the invention for detecting signals on an ignition system and FIG. 2 shows an equivalent circuit diagram.
Figur 1 zeigt eine Zündanlage, die zwei Zündspulen 11, 12 enthält. In den Zündspulen 11, 12 ist jeweils ein Ersatzschaltbild 13, 14 der Zündspule 11, 12 gezeigt. Primäranschlüsse 15, 16; 17, 18 der Zündspulen 11, 12 führen zu in Figur 1 nicht gezeigten Zündungsschaltgeräten. Ein Sekundäranschluß 19, 20 einer Sekundärwicklung 21, 22 führt jeweils zu einem Hochspannungsanschluß 23, 24.FIG. 1 shows an ignition system which contains two
An den Zündspulen 11, 12 sind jeweils Mittel 25, 26 zur kapazitiven Signalkopplung angeordnet. Die kapazitive Kopplung ist jeweils durch einen Kondensator 27, 28 veranschaulicht. Da der Kondensator 27, 28 nicht als separates Bauelement vorhanden ist, wurde er in Figur 1 strichliniert eingetragen.
Das der Zündspule 11 zugeordnete Mittel 25 ist über eine Abgleichanordnung 29 und eine Verbindungsleitung 30 sowie über eine Steckverbindung 31 mit einer Schaltungsanordnung 32 verbunden, die einen Ausgang 33 aufweist.The
Das der Zündspule 12 zugeordnete Mittel 26 ist über eine Steckverbindung 34, eine Verbindungsleitung 35 sowie eine Steckverbindung 36 mit der Schaltungsanordnung 32 verbunden.The
In Figur 2 ist ein Ersatzschaltbild der in Figur 1 schematisch dargestellten Vorrichtung gezeigt. Diejenigen in Figur 2 gezeigten Teile, die mit den in Figur 1 gezeigten Teilen übereinstimmen, tragen dieselben Bezugszahlen wie in Figur 1.FIG. 2 shows an equivalent circuit diagram of the device shown schematically in FIG. 1. Those parts shown in FIG. 2 which correspond to the parts shown in FIG. 1 have the same reference numbers as in FIG. 1.
Die Schaltungsanordnung 32 enthält spannungsbegrenzende Elemente, die aus jeweils zwei Dioden 37, 38; 39, 40 zusammengesetzt sind. Die spannungsbegrenzenden Elemente 37, 38; 39, 40 sind jeweils zwischen Eingangsleitungen 41, 42 der Schaltungsanordnung 32 und einer Masse 43 geschaltet. Parallel zum Ausgang 33 ist ein Widerstand 44 und ein Kondensator 45 geschaltet. Die Eingänge 41, 42 sind jeweils über Kondensatoren 46, 47 mit dem Ausgang 33 verbunden. Der Ausgang 33 führt zu einer weiteren Diagnoseeinrichtung 48.The
Die erfindungsgemäße Vorrichtung arbeitet folgendermaßen:The device according to the invention works as follows:
Die Zündanlage 10 enthält mehrere Zündspulen 11, 12, die beispielsweise zum zeitversetzten Zünden von mehreren Zylindern einer Brennkraftmaschine vorgesehen sind. Ein herkömmlicher Verteiler ist nicht mehr vorhanden. In einigen Zündanlagen 10 sind Verbindungsleitungen zwischen den Zündspulen 11, 12 und in Figur 1 nicht gezeigten Zündkerzen nicht mehr zugänglich. Die Zündkerzen sind dort unmittelbar mit den Hochspannungsanschlüssen 23, 24 verbunden. Um dennoch an verteilerlosen Zündanlagen 10 mit mehreren Zündspulen 11, 12 Hochspannungsmessungen vornehmen zu könnnen, sind erfindungsgemäß die Mittel 25, 26 zur kapazitiven Signalauskopplung vorgesehen. Die Mittel 25, 26 sind vorzugsweise als Ansteckteile ausgebildet, die zur Adaption an unterschiedliche Zündspulen 11, 12 spezielle Formgebungen aufweisen können. Die kapazitive Kopplung zwischen den Mitteln 25, 26 und den Sekundärwicklungen 21, 22 der Zündspulen 11, 12 ist durch den Koppelkondensator 27, 28 veranschaulicht, der als separates Bauteil nicht vorhanden ist. Eine Kopplung findet auch zur Primärseite der Zündspulen 11, 12 statt. Die in der Sekundärwicklung 21, 22 auftretenden Spannungen sind jedoch im allgemeinen um ein Vielfaches höher gegenüber denen auf der Primärseite, so daß die in den Mitteln 25, 26 jeweils eingekoppelte Spannung stets ein Maß für die sekundärseitig auftretende Spannung an den Zündspulen 11, 12 ist.The ignition system 10 contains a plurality of
Die von den Mitteln 25, 26 kapazitiv ausgekoppelten Signale werden in der Schaltungsanordnung 32 zusammengeführt. Die Mittel 25, 26 sind über Verbindungsleitungen 30, 35 und über Steckverbindungen 31, 36 an die Anordnung 32 anschließbar. In einer einfacheren Ausgestaltung können die Steckverbindungen 31, 36 entfallen.The signals capacitively coupled out by the
Das in Figur 2 gezeigte Schaltbild zeigt die Signalzusammenführung in der Schaltungsanordnung 32. Gemäß der Erfindung sind Kondensatoren 46, 47 zur Potentialtrennung vorgesehen. Mit dieser Maßnahme wird erreicht, daß eine fehlerhafte Adaption eines Mittels 25, 26 nicht zum Versagen der gesamten Anordnung führt. Ein Schutz ist insbesondere gegenüber einem Kurzschluß eines der Mittel 25, 26 gegen Masse 43 gegeben. Die Kondensatoren 46, 47 vermeiden ein zeitaufwendiges Suchen des gegen Masse kurzgeschlossenes Mittels 25, 26. Die Diagnoseeinrichtung 48, die die am Ausgang 33 zusammengeführten Signale weiter analysiert, ermöglicht anhand einer zeitbezogenen Darstellung der Signale leicht die Identifizierung des fehlerhaft angeschlossenen Mittels 25, 26.The circuit diagram shown in FIG. 2 shows the signal merging in the
Zum Schutz einer Bedienperson vor gefährlichen Berührungsspannungen enthält die Schaltungsanordnung 32 spannungsbegrenzende Mittel 37, 38; 39, 40. Besonders geeignet sind hier schnelle Begrenzerdioden 37, 38; 39, 40, die jeweils an den Eingängen 42, 41 gegen Masse 43 geschaltet sind. In Figur 2 sind die Dioden 37, 38; 39, 40 als Reihenschaltungen gezeigt mit unterschiedlichen Polarisierungen der Dioden 37, 38; 39, 40. Prinzipiell sind auch andere Beschaltungen geeignet.To protect an operator from dangerous touch voltages, the
In einer anderen Ausgestaltung können die spannungsbegrenzenden Mittel 37, 38; 39, 40 in der Ableichanordnung 29 vorgesehen sein. Mit dieser Anordnung der Mittel 37, 38; 39, 40 werden gefährlich hohe Spannungen nahe an der Quelle unterdrückt. Kapazitive Signalverkopplungen in der nachfolgenden Schaltungsanordnungen 32 und zwischen Leitungen 30, 35 werden minimiert.In another embodiment, the voltage-limiting
Eine Anpassung des Spannungspegels oder eine Kalibrierung der gesamten Anordnung ist mit dem Kondensator 45 möglich, der als Abgleichelement mit veränderlicher Kapazität ausgebildet ist. Der Kondensator 45 bildet mit den in Figur 1 gezeigten Ersatzkondensatoren 27, 28 jeweils einen Spannungsteiler. Das verhältnismäßig hohe Teilungsverhältnis, das die im kV-Bereich liegenden Spannungen an den Zündspulen 11, 12 auf leicht weiterverarbeitbare Werte herabsetzen muß, führt zu einem verhältnismäßig hohen Kapazitätswert des Kondensators 45, so daß die variable Kapazität dieses Kondensators 45 vorzugsweise durch Parallel- und/oder Reihenschaltungen aus mehreren Kondensatoren nachzubilden ist.An adaptation of the voltage level or a calibration of the entire arrangement is possible with the capacitor 45, which is designed as a balancing element with variable capacitance. The capacitor 45 forms a voltage divider with the
Die Anpassung oder Kalibrierung mit den Kondensator 45 wirkt sich gleichzeitig auf die an den Eingängen 41, 42 liegenden Signale aus. Eine individuelle Kalibrierung des einzelnen Mittels 25, 26 ist mit der Abgleichanordnung 29 möglich, die den entsprechenden Mitteln 25, 26 zugeordnet ist. Die Abgleichanordnung 29 ist beispielsweise mit dem Mittel 25, 26 baulich vereinigt. Sie enthält eine in den Figuren nicht näher gezeigte Anpaßschaltung, die vorzugsweise ebenfalls einen kapazitiven Spannungsteiler beinhaltet. Die Abgleichanordnung 29 ist vorteilhaft auch in der Schaltungsanordnung 32 unterzubringen.The adaptation or calibration with the capacitor 45 simultaneously affects the signals at the
Eine andere Ausgestaltung sieht den Einsatz von Steckverbindungen 34 an den Mitteln 25, 26 vor. Die Abgleichanordnung 29 ist hierbei vorzugsweise in der Steckverbindung 34 integriert. Die Steckverbindung 34 ermöglicht ein rasches Austauschen der Mittel 25, 26.Another embodiment provides for the use of
Die zwischen den Mitteln 25, 26 und der Schaltungsanordnung 32 vorhandenen Verbindungsleitungen 30, 35 können einadrige Leitungen sein. Vorzugsweise sind abgeschirmte Leitungen 30 vorgesehen, die eine Störsignaleinkopplung reduzieren. Die in den abgeschirmten Leitungen vorhandene Kabelkapazität ist bei der Kalibrierung der gesamten Anordnung leicht zu berücksichtigen.The connecting
Claims (6)
- Device for detecting high-voltage signal characteristics which occur in an ignition system containing more than one ignition coil (11, 12), having means (25, 26) for capacitive signal coupling (27, 28), which means can be provided on the ignition coils (11, 12), characterised in that a circuit arrangement (32) is provided, which can be connected in each case via separate connecting lines (30, 35) to the individual means (25, 26) for capacitive signal coupling (27, 28), in that in the circuit arrangement (32) the signals detected by the means (25, 26) for capacitive signal coupling (27, 28) are combined onto a line connected to an output (33) of the circuit arrangement (32), and in that within the circuit arrangement (32) in each case a further capacitive signal coupling (46, 47) for potential isolation is provided upstream of the signal combining means.
- Device according to Claim 1, characterised in that at least one tuning element (45) for calibrating the voltage occurring at the output (33) is provided in the circuit arrangement (32).
- Device according to Claim 1 or 2, characterised in that each means (25, 26) is assigned a tuning arrangement (29), located upstream of the signal combining means, for the purpose of calibrating signal voltages output by the means (25, 26).
- Device according to one of the preceding claims, characterised in that voltage-limiting means (37, 38; 39, 40) are provided at inputs (41, 42) of the signal arrangement (32).
- Device according to one of the preceding claims, characterised in that the means (25, 26) for capacitive signal coupling are realised as parts which can be plugged into the ignition coils (11, 12).
- Device according to one of the preceding claims, characterised in that the means (25, 26) for capacitive signal coupling have a plug-in device (34) for the connection of connecting lines (30, 35) which lead to the circuit arrangement (32).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4040236A DE4040236A1 (en) | 1990-12-15 | 1990-12-15 | DEVICE FOR DETECTING SIGNALS |
| DE4040236 | 1990-12-15 | ||
| PCT/DE1991/000914 WO1992010674A1 (en) | 1990-12-15 | 1991-11-21 | Signal-acquisition device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0561807A1 EP0561807A1 (en) | 1993-09-29 |
| EP0561807B1 true EP0561807B1 (en) | 1996-10-16 |
Family
ID=6420498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91919778A Expired - Lifetime EP0561807B1 (en) | 1990-12-15 | 1991-11-21 | Signal-acquisition device |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5444376A (en) |
| EP (1) | EP0561807B1 (en) |
| JP (1) | JP3212601B2 (en) |
| AU (1) | AU646315B2 (en) |
| DE (2) | DE4040236A1 (en) |
| WO (1) | WO1992010674A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4443304A1 (en) * | 1994-12-06 | 1996-06-13 | Bosch Gmbh Robert | Device for acquiring signals |
| US6411096B1 (en) | 1998-03-06 | 2002-06-25 | Snap-On Tools Company | Scope analyzer for direct ignition engines |
| DE19910416A1 (en) * | 1999-03-10 | 2000-09-14 | Bosch Gmbh Robert | Device for detecting signals on an ignition system |
| US6717412B1 (en) | 1999-09-24 | 2004-04-06 | Snap-On Technologies, Inc. | Ignition signal pickup interface box |
| US6969995B2 (en) * | 2002-09-05 | 2005-11-29 | Florian Virchow | Measuring device for ignition voltages |
| US6940283B2 (en) * | 2003-03-20 | 2005-09-06 | Snap-On Incorporated | Detecting field from different ignition coils using adjustable probe |
| US20040239331A1 (en) * | 2003-03-21 | 2004-12-02 | Mcqueeney Kenneth | Dual capacitive-coupled sensor for hybrid ignition coil |
| US7009400B1 (en) * | 2004-02-06 | 2006-03-07 | Snap-On Incorporated | Universal capacitive adapter for engine diagnostics |
| US7002351B1 (en) * | 2004-02-27 | 2006-02-21 | Snap-On Incorporated | Variable compensation circuit for capacitive adapters |
| DE102006025073A1 (en) * | 2006-05-30 | 2007-12-06 | Robert Bosch Gmbh | ignition coil |
| US8490598B2 (en) * | 2009-08-20 | 2013-07-23 | Ford Global Technologies, Llc | Ignition coil with ionization and digital feedback for an internal combustion engine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0461384A2 (en) * | 1990-06-13 | 1991-12-18 | Robert Bosch Gmbh | Diagnosis installation |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2237071B3 (en) * | 1973-07-12 | 1977-05-06 | Siemens Ag | |
| US3959725A (en) * | 1974-04-29 | 1976-05-25 | Sun Electric Corporation | Distributor voltage sensor |
| US4052665A (en) * | 1976-03-30 | 1977-10-04 | Snap-On Tools Corporation | Capacitive pickup device for pulsating high voltage measurements |
| FR2474173A1 (en) * | 1980-01-17 | 1981-07-24 | Renault | SYNCHRONISM SENSOR FOR IGNITION ENGINE |
| US4349782A (en) * | 1980-11-21 | 1982-09-14 | Doss James D | Shielded differentiator for automotive ignition applications |
| US4758791A (en) * | 1986-11-28 | 1988-07-19 | United Technologies Corporation | Universal secondary high voltage sensor |
| DE3641144C2 (en) * | 1986-12-02 | 1995-07-13 | Fichtel & Sachs Ag | Peak voltage measuring device |
| US4795979A (en) * | 1986-12-15 | 1989-01-03 | Sun Electric Corporation | Method and apparatus for determining cylinder #1 power firing event in wasted spark ignition systems |
| DE3705692C2 (en) * | 1987-02-23 | 1995-12-07 | Bosch Gmbh Robert | Test device for ignition distributor |
| DE3733401C1 (en) * | 1987-10-02 | 1989-04-27 | Bodo Dipl-Ing Dip Liebergesell | Test circuit for setting the synchronization of a dual ignition system |
| DE3924130A1 (en) * | 1989-07-20 | 1991-01-31 | Bosch Gmbh Robert | DEVICE FOR DETECTING MISSING OR BAD BURNS IN OTTO ENGINES |
| US5004984A (en) * | 1989-09-08 | 1991-04-02 | Snap-On Tools Corporation | Magnetic field pickup assembly for diagnositics on specific engine |
| CA2018601A1 (en) * | 1989-09-08 | 1991-03-08 | Thomas P. Becker | Magnetic field pickup for automotive ignition diagnostics |
| DE8910945U1 (en) * | 1989-09-13 | 1989-10-26 | Hermann, Horst, 8501 Cadolzburg | Device for measuring the secondary voltage curve of the ignition coils of an internal combustion engine |
| DE9109457U1 (en) * | 1991-07-31 | 1991-10-10 | Berenz, Lorenz, 7209 Gosheim | shower |
-
1990
- 1990-12-15 DE DE4040236A patent/DE4040236A1/en not_active Withdrawn
-
1991
- 1991-11-21 DE DE59108288T patent/DE59108288D1/en not_active Expired - Lifetime
- 1991-11-21 WO PCT/DE1991/000914 patent/WO1992010674A1/en active IP Right Grant
- 1991-11-21 US US08/064,020 patent/US5444376A/en not_active Expired - Lifetime
- 1991-11-21 EP EP91919778A patent/EP0561807B1/en not_active Expired - Lifetime
- 1991-11-21 AU AU89229/91A patent/AU646315B2/en not_active Ceased
- 1991-11-21 JP JP51798091A patent/JP3212601B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0461384A2 (en) * | 1990-06-13 | 1991-12-18 | Robert Bosch Gmbh | Diagnosis installation |
Also Published As
| Publication number | Publication date |
|---|---|
| US5444376A (en) | 1995-08-22 |
| AU646315B2 (en) | 1994-02-17 |
| EP0561807A1 (en) | 1993-09-29 |
| WO1992010674A1 (en) | 1992-06-25 |
| DE4040236A1 (en) | 1992-06-17 |
| DE59108288D1 (en) | 1996-11-21 |
| JP3212601B2 (en) | 2001-09-25 |
| AU8922991A (en) | 1992-07-08 |
| JPH06503138A (en) | 1994-04-07 |
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