EP0386431A2 - Measurement circuitry for the primary voltage of an ignition coil - Google Patents

Measurement circuitry for the primary voltage of an ignition coil Download PDF

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Publication number
EP0386431A2
EP0386431A2 EP19900101468 EP90101468A EP0386431A2 EP 0386431 A2 EP0386431 A2 EP 0386431A2 EP 19900101468 EP19900101468 EP 19900101468 EP 90101468 A EP90101468 A EP 90101468A EP 0386431 A2 EP0386431 A2 EP 0386431A2
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EP
European Patent Office
Prior art keywords
voltage
primary voltage
circuit arrangement
input
arrangement according
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Granted
Application number
EP19900101468
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German (de)
French (fr)
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EP0386431A3 (en
EP0386431B1 (en
Inventor
Bernd Bodig
Klaus Dipl.-Ing. Hueser
Achim Dipl.-Ing. Herzog
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02P17/12—Testing characteristics of the spark, ignition voltage or current

Abstract

A circuit arrangement for measuring the primary voltage of an ignition coil is proposed which manages without transistors and zener diodes and is thus particularly suitable for implementation in hybrid technology. The circuit provides a possibility for analog evaluation of the primary voltage and outputs the spark firing duration in the form of a digital signal. …<IMAGE>…

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Schaltungsanordnung zur Messung der Primärspannung einer Zündspule gemäß der Gattung des Hauptanspruchs.The invention relates to a circuit arrangement for measuring the primary voltage of an ignition coil according to the preamble of the main claim.

Es sind Schaltungen zur Messung der Primärspannung von Zündspulen in Kraftfahrzeugen bekannt, die zur Erken­nung der Funkenbrenndauer des Zündfunkens Transistoren und Zenerdioden benötigen. Am Ausgang dieser Schaltung wird lediglich ein digitales Signal bereitgestellt, welches die Funkenbrenndauer kennzeichnet. Die erfor­derlichen Transistoren und Zenerdioden sind für die An­wendung in Hybridschaltungen ungünstig, da diese Bau­teile einen hohen Fertigungsaufwand darstellen.Circuits for measuring the primary voltage of ignition coils in motor vehicles are known which require transistors and Zener diodes to detect the spark duration of the ignition spark. At the output of this circuit, only a digital signal is provided, which identifies the spark duration. The required transistors and Zener diodes are unfavorable for use in hybrid circuits, since these components represent a high manufacturing outlay.

Vorteile der ErfindungAdvantages of the invention

Die Schaltungsanordnung zur Messung der Primärspannung einer Zündspule mit den Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß die Funkenbrenndauer weiterhin digital ausgewertet werden kann und zusätz­lich die Möglichkeit besteht, die Primärspannung in zwei unterschiedlichen Maßstäben analog zu erfassen. Bei Einsatz einer sogenannten ruhenden Zündspannungs­ verteilung mit mehreren Zündspulen können sämtliche Zündspulen mit der erfindungsgemäßen Schaltungsanord­nung bezüglich ihrer Primärspannung überwacht werden. Zu diesem Zweck werden eingangsseitig mehrere Eingangs­dioden angeordnet, die ein eingangsseitiges ODER-Gatter bilden.The circuit arrangement for measuring the primary voltage of an ignition coil with the features of the main claim has the advantage that the spark duration can still be evaluated digitally and there is also the possibility of analogue detection of the primary voltage on two different scales. When using a so-called static ignition voltage distribution with several ignition coils, all ignition coils can be monitored with the circuit arrangement according to the invention with regard to their primary voltage. For this purpose, several input diodes are arranged on the input side, which form an input-side OR gate.

Die analoge Primärspannung wird mittels eines Span­nungsteilers geteilt und reduzierte Primärspannung ana­log und digital ausgewertet. Somit ist sowohl eine ana­loge Brennspannungserfassung als auch eine digitale Funkendauererfassung möglich. Transistoren und Zener­dioden sind nicht erforderlich, weshalb die Schaltungs­anordnung für eine Realisierung in Hybridtechnik gut geeignet ist.The analog primary voltage is divided by means of a voltage divider and reduced primary voltage is evaluated analog and digital. This enables both analog burning voltage detection and digital spark duration detection. Transistors and Zener diodes are not required, which is why the circuit arrangement is well suited for implementation in hybrid technology.

Um eine Verfälschung durch Spannungspitzen zu verhin­dern, wird mittels eines Kondensators eine Mittelwert­bildung am Teilerabgriff vorgenommen. Mittels einer Klammerschaltung können außerdem nachfolgende IC-­Eingänge vor Überspannungen geschützt werden.In order to prevent falsification by voltage peaks, a mean value is formed on the divider tap using a capacitor. Using a bracket circuit, subsequent IC inputs can also be protected against overvoltages.

Der Differenzverstärker ist ein Komparator mit Schalthysterese, dessen Ausgangsspannung zur digitalen Funkendauererkennung dient. Die Ausgangssignale der Schaltungsanordnung können im Rechner der vorhandenen Motorsteuerung ausgewertet und für Steuerfunktionen be­rücksichtigt werden.The differential amplifier is a comparator with switching hysteresis, the output voltage of which is used for digital spark duration detection. The output signals of the circuit arrangement can be evaluated in the computer of the existing motor control and taken into account for control functions.

Zeichnungdrawing

Die Erfindung wird nachfolgend anhand der Zeichnung nä­her erläutert. Es zeigen:

  • Figur 1 eine erfindungsgemäße Schaltungsanordnung für analoge und digitale Primärspannungserfassung,
  • Figur 2 den zeitlichen Verlauf einer an einer Zündspule anliegenden Primärsspannung,
  • Figur 3 den zu der in Figur 2 dargestellten Primärspan­nung gehörenden Verlauf des analogen Ausgangssignals der erfindungsgemäßen Schaltung und
  • Figur 4 den zugehörigen Verlauf des digitalen Ausgangs­signals der erfindungsgemäßen Schaltung.
The invention is explained below with reference to the drawing. Show it:
  • FIG. 1 shows a circuit arrangement according to the invention for analog and digital primary voltage detection,
  • FIG. 2 shows the time course of a primary voltage applied to an ignition coil,
  • 3 shows the course of the analog output signal of the circuit according to the invention belonging to the primary voltage shown in FIG
  • Figure 4 shows the associated course of the digital output signal of the circuit according to the invention.

Die in Figur 1 dargestellte Schaltungsanordnung besitzt an ihren beiden Eingängen für die Primärspannungen UP1, UP2 zweier nicht dargestellter Primärspannungen zwei Schutzdioden D1, D2, die ein Eingangs-ODER-Gatter bilden. Die jeweils anliegende Primärspannung UP1 bzw. UP2 wird über einem Spannungsteiler mit den Teilerwi­derständen R1, R2 um den Faktor R2/(R1 + R2) reduziert. Um eine Verfälschung durch Spannungsspitzen zu verhindern, wird mittels eines dem Teilerwiderstand R2 parallel geschalteten Kondensator C1 eine Mittelwert­bildung der reduzierten Primärspannung durchgeführt, die als analoge Ausgangsspannung UA einer Auswerte­schaltung 1 zugeführt wird.The circuit arrangement shown in FIG. 1 has two protective diodes D1, D2 at its two inputs for the primary voltages UP1, UP2 of two primary voltages (not shown), which form an input OR gate. The respective applied primary voltage UP1 or UP2 is reduced by the factor R2 / (R1 + R2) via a voltage divider with the divider resistors R1, R2. In order to prevent falsification by voltage peaks, a mean value formation of the reduced primary voltage is carried out by means of a capacitor C1 connected in parallel with the divider resistor R2, which is supplied to an evaluation circuit 1 as an analog output voltage UA.

Die Batteriespannung UB wird über einen zweiten Span­nungsteiler mit den Widerständen R3, R4 geteilt, wobei die geteilte Batteriespannung dem negativen Eingang ei­nes Differenzverstärkers 2 als Referenzspannung UR zu­geführt wird. Aus Symmetriegründen sind die Widerstände beider Teiler wie folgt dimensioniert: R1 = R3, R2 = R4 Zur Verschiebung der Schaltschwelle des Differenzver­stärkers 2 wird eine Diode D3 mit der Diodenspannung UD zum Widerstand R4 in Reihe geschaltet.The battery voltage UB is divided by a second voltage divider with the resistors R3, R4, the divided battery voltage being supplied to the negative input of a differential amplifier 2 as a reference voltage UR. For reasons of symmetry, the resistances of both dividers are dimensioned as follows: R1 = R3, R2 = R4 To shift the switching threshold of the differential amplifier 2, a diode D3 is connected in series with the diode voltage UD to the resistor R4.

Am positiven Eingang des Differenzverstärkers 2 liegt die geteilte Primärspannung über einen Eingangswider­stand R5 an. Zwischen positivem Eingang des Differenz­ verstärkers 2 und seinem Ausgang ist ein Rückkopplungs­widerstand R6 wirksam. Der derart beschaltete Diffe­renzverstärker 2 arbeitet wie ein Komparator mit Schalthysterese und gibt eine digitale Ausgangsspannung UD ab, deren Dauer der Funkenbrenndauer entspricht. In der Auswerteschaltung 1 wird auch die digitale Aus­gangsspannung UD ausgewertet.The divided primary voltage is present at the positive input of differential amplifier 2 via an input resistor R5. Between positive input of the difference amplifier 2 and its output, a feedback resistor R6 is effective. The differential amplifier 2 wired in this way works like a comparator with switching hysteresis and outputs a digital output voltage UD, the duration of which corresponds to the spark duration. The digital output voltage UD is also evaluated in the evaluation circuit 1.

Um nachfolgende IC-Eingänge zu schützen, wird die am Teilerabgriff zwischen den Teilerwiderständen R1 und R2 auftretende geteilte Primärspannung mittels einer Diode D5 und einem weiteren niederohmigen Spannungsteiler, der aus den Widerständen R7, R8 besteht, geklammert. Die Klammerung ist so dimensioniert, daß Primärspannun­gen oberhalb der Brennspannung geklammert werden, wobei für diese Spannungen die Teilerwiderstände R1 und R7 in Parallelschaltung zu R8 wirksam sind. Spannungen ober­halb der Brennspannung können somit in verändertem Maß­stab ebenfalls analog in der Auswerteschaltung 1 ausge­wertet werden. Der Kondensator C1 muß genügend klein gewählt werden, damit die analoge Auswertung von Über­spannungen möglich ist.In order to protect subsequent IC inputs, the divided primary voltage occurring at the divider tap between the divider resistors R1 and R2 is clamped by means of a diode D5 and another low-resistance voltage divider, which consists of the resistors R7, R8. The brackets are dimensioned such that primary voltages above the operating voltage are bracketed, the divider resistors R1 and R7 acting in parallel with R8 for these voltages. Voltages above the operating voltage can thus also be evaluated analogously in the evaluation circuit 1 on a changed scale. The capacitor C1 must be chosen to be sufficiently small so that the analog evaluation of overvoltages is possible.

Die Diode D4 hat die gleiche Funktion bezogen auf die Batteriespannung UB, wie die Diode D5 bezogen auf die Primärspannungen UP1 bzw. UP2.The diode D4 has the same function in relation to the battery voltage UB as the diode D5 in relation to the primary voltages UP1 and UP2.

Der als Differenzverstärker 2 ausgebildete Komparator vergleicht die geteilte Primärspannung UA mit der Refe­renzspannung UR, die mittels eines Spannungsteilers aus der Batteriespannung UB abgeleitet ist. Der Komparator besitzt eine Hysterese, die durch die Widerstände R5 und R6 bestimmt ist.The comparator designed as a differential amplifier 2 compares the divided primary voltage UA with the reference voltage UR, which is derived from the battery voltage UB by means of a voltage divider. The comparator has a hysteresis which is determined by the resistors R5 and R6.

In der Auswerteschaltung 1, die Teil der hier nicht dargestellten Motorsteuerung sein kann, erfolgt eine analoge Primärspannungserfassung 3 und eine digitale Funkendauererkennung 4. Die dabei ermittelten Werte können zu Steuerfunktionen in der Motorsteuerung be­rücksichtigt werden. Die Ausgangsspannungen UA, UD kön­nen auch zur Fehlererkennung ausgewertet werden.An analog primary voltage detection 3 and a digital one take place in the evaluation circuit 1, which can be part of the motor control not shown here Spark duration detection 4. The values determined can be taken into account for control functions in the engine control. The output voltages UA, UD can also be evaluated for error detection.

In Figur 2 ist der zeitliche Verlauf einer Primärspan­nung UP dargestellt. Die zugehörigen Ausgangsspannungen UA und UD sind in Figur 3 und Figur 4 gezeigt.The time profile of a primary voltage UP is shown in FIG. The associated output voltages UA and UD are shown in FIG. 3 and FIG. 4.

In Figur 3 ist mit unterbrochener Linie der Verlauf der analogen Ausgangsspannung UA dargestellt, wie er ohne Kondensator C1 auftritt. Der Kondensator C1 besitzt so­mit die Kapazität OnF. Wird dagegen ein Kondensator C1 wie in Figur 1 dargestellt verwendet, so glättet sich der Verlauf der Spannung UA entsprechend dem mit durch­gehender Linie dargestellten Spannungsverlauf.FIG. 3 shows the course of the analog output voltage UA with a broken line as it occurs without capacitor C1. The capacitor C1 thus has the capacitance OnF. If, on the other hand, a capacitor C1 is used as shown in FIG. 1, the curve of the voltage UA smoothes out according to the voltage curve shown with a solid line.

Das in Figur 4 dargestellte Signal gibt die Funken­brenndauer T an.The signal shown in Figure 4 indicates the spark duration T.

Claims (6)

1. Schaltungsanordnung zur Messung der Primärspannung einer Zündspule mit einem Differenzverstärker, dem ein­gangsseitig ein von der Primärspannung abgeleitetes re­duziertes Signal und eine Referenzspannung zugeführt wird und der ausgangsseitig ein der Brenndauer des Zündfunkens entsprechend langes Brenndauersignal ab­gibt, dadurch gekennzeichnet, daß die Primärspannung (UP1, UP2) über eine in Durchlaßrichtung geschaltete Schutzdiode (D1, D2) und einen Spannungsteiler (R1, R2) abgegriffen und über einen Widerstand (R5) dem einen Eingang des Differenzverstärkers (2) zugeführt wird, und daß die am Spannungsteiler (R1, R2) auftretende ge­teilte Primärspannung (UA) einer analogen Auswerteein­richtung (3) zugeführt wird.1.Circuit arrangement for measuring the primary voltage of an ignition coil with a differential amplifier, to the input of which a reduced signal derived from the primary voltage and a reference voltage are supplied, and which on the output side emits a long-duration signal corresponding to the duration of the ignition spark, characterized in that the primary voltage (UP1, UP2 ) tapped via a protective diode (D1, D2) and a voltage divider (R1, R2) connected in the forward direction and fed to one input of the differential amplifier (2) via a resistor (R5), and that that which occurs at the voltage divider (R1, R2) divided primary voltage (UA) is fed to an analog evaluation device (3). 2. Schaltungsanordnung nach Anspruch 1, dadurch ge­kennzeichnet, daß an der geteilten Primärspannung (UA) mittels eines Kondensators (C1) eine Mittelwertbildung vorgenommen wird.2. Circuit arrangement according to claim 1, characterized in that the divided primary voltage (UA) is carried out by means of a capacitor (C1). 3. Schaltungsanordnung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die geteilte Primärspan­nung bei Primärspannungswerten, die oberhalb der Brenn­spannung des Zündfunkens liegen, geklammert wird.3. Circuit arrangement according to one of claims 1 or 2, characterized in that the divided primary voltage is bracketed at primary voltage values which are above the operating voltage of the ignition spark. 4. Schaltungsanordnung nach Anspruch 3, dadurch ge­ kennzeichnet, daß zur Klammerung der geteilten Primär­spannung eine Klammerschaltung verwendet wird, die aus einer am Abgriff des Spannungsteilers (R1, R2) ange­schlossenen Diode (D5) und einem der Diode nachgeschal­teten niederohmigen weiteren Spannungsteiler (R7, R8) besteht.4. Circuit arrangement according to claim 3, characterized ge indicates that a clamp circuit is used to clamp the divided primary voltage, which consists of a diode (D5) connected to the tap of the voltage divider (R1, R2) and a low-impedance further voltage divider (R7, R8) connected downstream of the diode. 5. Schaltungsanordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Differenz­verstärker (2) eine Schalthysterese hat, die durch ei­nen an seinem Meßeingang vorgeschalteten Eingangswider­stand (R5) und einen zwischen dem Meßeingang und seinem Ausgang wirksamen Rückkopplungswiderstand (R6) bestimmt ist.5. Circuit arrangement according to one of the preceding claims, characterized in that the differential amplifier (2) has a switching hysteresis, which is determined by an input resistor connected upstream at its measuring input (R5) and an effective feedback resistor (R6) between the measuring input and its output. 6. Schaltungsanordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß am Eingang der Schaltungsanordnung mehrere Schutzdioden (D1, D2) ein Eingangs-ODER-Gatter bilden.6. Circuit arrangement according to one of the preceding claims, characterized in that a plurality of protective diodes (D1, D2) form an input OR gate at the input of the circuit arrangement.
EP90101468A 1989-03-09 1990-01-25 Measurement circuitry for the primary voltage of an ignition coil Expired - Lifetime EP0386431B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3907616 1989-03-09
DE3907616A DE3907616A1 (en) 1989-03-09 1989-03-09 CIRCUIT ARRANGEMENT FOR MEASURING THE PRIMARY VOLTAGE OF A IGNITION COIL

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EP0386431A2 true EP0386431A2 (en) 1990-09-12
EP0386431A3 EP0386431A3 (en) 1991-04-24
EP0386431B1 EP0386431B1 (en) 1994-06-15

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Cited By (9)

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Publication number Priority date Publication date Assignee Title
EP0502549A2 (en) * 1991-03-07 1992-09-09 BERU Ruprecht GmbH &amp; Co. KG Spark survey in spark ignition engine
DE4331874A1 (en) * 1993-09-21 1995-03-23 Telefunken Microelectron Circuit arrangement for limiting the ignition voltage
EP0652363A2 (en) * 1993-11-08 1995-05-10 Chrysler Corporation Engine ignition and control system
EP0740072A1 (en) * 1995-04-28 1996-10-30 STMicroelectronics S.r.l. Method and circuit for detecting the presence of a spark in internal combustion engine
EP0740073A1 (en) * 1995-04-28 1996-10-30 Co.Ri.M.Me. Consorzio Per La Ricerca Sulla Microelettronica Nel Mezzogiorno Circuit for detecting an overvoltage on an electric load
WO1998004830A1 (en) * 1996-07-26 1998-02-05 Robert Bosch Gmbh Circuit for measuring the ignition coil primary voltage of the ignition system of an internal combustion engine
WO1999007995A1 (en) * 1997-08-12 1999-02-18 Siemens Aktiengesellschaft Measuring and diagnostic device for an ignition system of an internal combustion engine
US6278278B1 (en) 1998-08-12 2001-08-21 Siemens Aktiengesellschaft Measuring and diagnostic device for an ignition system of an internal combustion engine
CZ309271B6 (en) * 2019-12-18 2022-07-06 OZM Research s.r.o High-voltage differential probe and device for measuring and evaluating the energy of an electric discharge

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DE4020986C2 (en) * 1990-07-02 1998-09-03 Telefunken Microelectron Electronic ignition system for an internal combustion engine
JP2004187168A (en) * 2002-12-05 2004-07-02 Sumitomo Electric Ind Ltd Circuit structure, optical receiver, and optical link
US8031452B2 (en) * 2008-07-10 2011-10-04 Siemens Industry, Inc. Single-supply single-ended high voltage peak detector
CN102714422B (en) * 2009-11-30 2016-03-09 前瞻思维产品有限公司 Battery simulator and using method thereof
JP5838776B2 (en) * 2011-12-15 2016-01-06 富士電機株式会社 Ignition device for internal combustion engine
US20180135590A1 (en) * 2016-11-15 2018-05-17 Woodward, Inc. Controlling Engine Ignition
US11798324B2 (en) 2018-12-21 2023-10-24 Champion Aerospace Llc Spark igniter life detection

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0502549A2 (en) * 1991-03-07 1992-09-09 BERU Ruprecht GmbH &amp; Co. KG Spark survey in spark ignition engine
EP0502549A3 (en) * 1991-03-07 1993-12-01 Beru Werk Ruprecht Gmbh Co A Spark survey in spark ignition engine
DE4331874A1 (en) * 1993-09-21 1995-03-23 Telefunken Microelectron Circuit arrangement for limiting the ignition voltage
DE4331874C2 (en) * 1993-09-21 1999-07-01 Temic Semiconductor Gmbh Ignition system for internal combustion engines with a static ignition voltage distribution
EP0652363A2 (en) * 1993-11-08 1995-05-10 Chrysler Corporation Engine ignition and control system
EP0652363A3 (en) * 1993-11-08 1996-05-29 Chrysler Corp Engine ignition and control system.
EP0740073A1 (en) * 1995-04-28 1996-10-30 Co.Ri.M.Me. Consorzio Per La Ricerca Sulla Microelettronica Nel Mezzogiorno Circuit for detecting an overvoltage on an electric load
US5735254A (en) * 1995-04-28 1998-04-07 Sgs-Thomson Microelectronics S.R.L. Circuit for detecting an overvoltage on a switched inductive load
US5790039A (en) * 1995-04-28 1998-08-04 Sgs-Thomson Microelectronics S.R.L. Method for detecting the presence of a spark in an electronic ignition system used with an internal combustion engine
EP0740072A1 (en) * 1995-04-28 1996-10-30 STMicroelectronics S.r.l. Method and circuit for detecting the presence of a spark in internal combustion engine
WO1998004830A1 (en) * 1996-07-26 1998-02-05 Robert Bosch Gmbh Circuit for measuring the ignition coil primary voltage of the ignition system of an internal combustion engine
WO1999007995A1 (en) * 1997-08-12 1999-02-18 Siemens Aktiengesellschaft Measuring and diagnostic device for an ignition system of an internal combustion engine
US6278278B1 (en) 1998-08-12 2001-08-21 Siemens Aktiengesellschaft Measuring and diagnostic device for an ignition system of an internal combustion engine
CZ309271B6 (en) * 2019-12-18 2022-07-06 OZM Research s.r.o High-voltage differential probe and device for measuring and evaluating the energy of an electric discharge

Also Published As

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DE3907616A1 (en) 1990-09-20
DE59006090D1 (en) 1994-07-21
EP0386431A3 (en) 1991-04-24
EP0386431B1 (en) 1994-06-15
US5075627A (en) 1991-12-24

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