EP1054154A2 - Vorrichtung zur Erfassung eines Ionenstromes für eine Brennkraftmaschine - Google Patents
Vorrichtung zur Erfassung eines Ionenstromes für eine Brennkraftmaschine Download PDFInfo
- Publication number
- EP1054154A2 EP1054154A2 EP00107750A EP00107750A EP1054154A2 EP 1054154 A2 EP1054154 A2 EP 1054154A2 EP 00107750 A EP00107750 A EP 00107750A EP 00107750 A EP00107750 A EP 00107750A EP 1054154 A2 EP1054154 A2 EP 1054154A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- measuring
- current
- generating device
- voltage generating
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 27
- 238000005259 measurement Methods 0.000 abstract description 12
- 239000003990 capacitor Substances 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
- F02P17/12—Testing characteristics of the spark, ignition voltage or current
Definitions
- the invention relates to a device for detecting an ion current for a 5.
- Internal combustion engine according to the preamble of claim 1 and 5 respectively.
- DE 197 34 039 A1 take a different approach, DE 197 33 869 A1 and DE 197 30 362 A1.
- DE 197 30 362 A1 uses a comparator circuit for this purpose Threshold value from the combustion control unit via a voltage interface is adjustable.
- DE 197 33 869 A1 uses masking circuits and one Bandpass to convert the ion current signal into a pulse knock signal that is used to further evaluation is sent to the combustion control unit.
- the combustion control unit has no possibility to intervene on the threshold values Knock signal detection, which has disadvantages during the application phase of such Systems can lead.
- DE 197 34 039 A1 uses a pulse generating device for misfire detection.
- DE 197 34 039 A1 and DE 197 33 869 A1 also use the unfiltered voltage signal via the measuring resistor.
- all of the aforementioned procedures lead to an increased wiring effort.
- the noise and Reaction problems when evaluating this voltage-continuous Analog signal are not limited to a pulse generating device for misfire detection.
- a measuring resistor to ground leads to the measuring point to a negative voltage signal compared to the reference ground. This enforces an additional negative voltage supply and a reverse amplifier for signal evaluation. For noise reduction, it is therefore advisable to use this amplifier stage to introduce a band limitation. However, this requires at Reverse amplifier trimmed capacitors.
- the use of a measuring shunt consequently increases switching complexity and cost. Otherwise, a measuring shunt forms also a voltage divider with the measuring channel in the combustion chamber, d. H. the Choosing this resistor reduces the size of the already small ion current.
- the object of the invention is a device for detecting an ion current for to create an internal combustion engine which avoids the aforementioned disadvantages and a vehicle-ready ion current measurement signal in a simple way delivers. This task is alternatively by that in claim 1 and that in claim 5 mentioned features solved.
- a current / voltage converter is used as the measurement signal converter used, which consists of an operational amplifier.
- the negative input of the operational amplifier is connected to the measuring voltage generating device, the ignition current bypass and a resistor with its output, which delivers the measurement signal, connected.
- the positive input of the operational amplifier lies on ground or a slightly increased potential.
- a current-voltage converter in the form of an interface converter, for example hetze, Schenck, 9th ed., page 366.
- this circuit usually does for adapting a current interface with controllable impressed current used on a voltage interface. In this case the circuit acts as Current sink.
- the circuit is embossed in conjunction with an Constant voltage source, namely the ion measuring voltage generating device, therefore uses and functions as a current source for the ion current.
- an Constant voltage source namely the ion measuring voltage generating device
- an output driver is added the measuring signal converter provided, which is essentially a current interface between a measuring voltage generating device and an output of the total Device represents.
- a current interface generally has the advantage that possible potential offsets between the control unit near the combustion chamber and the combustion control unit have little influence on the signal transmission.
- FIG. 1 is a schematic overview of a device according to the invention shown for detection of an ion current.
- This device comprises an ion current measuring voltage generating device 1, an ignition current bypass 2, which too a protective circuit 3 and a current / voltage converter 4 connected in parallel is.
- the current / voltage converter 4 in turn is in series with a filter stage 5 and an optional additional output driver 6 switched.
- the ion current measuring voltage generating device 1 is via an interface Schn_Z connected to an ignition system, which is not shown in detail. On the other side is the measuring voltage generating device 1 via an interface 1a with the ignition current bypass 2, the protective circuit 3 and the current / voltage converter 4 connected. Define the interfaces 4-5, 5-6 and ECU the connections between the corresponding parts of the device.
- FIGS. 2 to 10 The individual parts of the device, namely the measuring voltage generating device 1, the ignition current bypass 2, the protective circuit 3, the current / voltage converter 4, the filter stage 5 and the optional output driver 6 are shown in FIGS. 2 to 10 shown in more detail using circuit diagrams.
- Fig. 2 is a known embodiment of a measuring voltage generating device 1 shown.
- This essentially consists of an ignition device an ignition coil L1, a control unit, here in the form of a transistor T1, and a spark plug X1.
- the spark plug X1 and the transistor T1 are open Mass laid.
- the transistor is on the collector side with the primary winding of the coil L1 connected, which in turn is applied to a supply voltage Ub. How 2, several of these ignition arrangements can be connected in series his.
- the secondary winding of coil L1 is on the one hand with the spark plug X1, on the other hand connected to the secondary mass return 4a, the a parallel connection of a storage capacitor Cs and one or more Zener diodes Dz causes.
- Z_S is the interface to the ignition system.
- the interface already known from FIG. 1 is designated by 1a.
- the sizes L2, T2, X2 denote the parts of a second, parallel ignition arrangement.
- a measuring voltage generating device 1 consists essentially of a primary-side charging circuit with at least one low-voltage diode DL and a resistor RL connected in series, which has a common Node with at least one high voltage diode Dh on the high voltage side has at least one spark plug X1, Xx. Furthermore, a parallel connection of a Storage capacitor Cs and one or more Zener diodes Dz provided. The cathodes of the high-voltage diodes Dh each form a common node with the high voltage side UH1 ?? UHX of the associated ignition coil, L1 .... Lx.
- the anodes of the low-voltage diodes DL each form a common node, with the ground connection UL1 ?? ULX of the primary side of the associated Ignition coil L1 ........ Lx.
- FIG. 4 is a known embodiment of an ignition current bypass (Reference number 2 in FIG. 1) and a protective circuit (reference number 3 in FIG. 1) shown.
- the entire arrangement consists of an ignition diode Dzs and at least one ignition diode Ds which is connected inversely to it.
- the ignition current bypass is especially important in the first ignition phase.
- the current / voltage converter 4 comprises one Operational amplifier OP, which with its negative input with the measuring voltage generating device 1 and the ignition current bypass 2 is connected. Furthermore, the negative input of the operational amplifier is through a resistor Rq is connected to its output, which essentially supplies the measurement signal.
- the positive input of the operational amplifier is at ground. Alternatively it can also be at a slightly increased potential.
- the second embodiment according to FIG. 6 there is a current / voltage converter shown (compared to that in Fig. 5) one connected in parallel with the resistor Rq Capacitor Ctp, which has an early band limit causes. Otherwise there is a diagnostic offset circuit in the form of at least one Series resistor Rv and a Schottky diode Do provided.
- the Schottky diode The capacitor Co connected in parallel improves the stability in the present case the offset voltage, however, is not mandatory.
- the offset circuit can alternatively be a Zener voltage or a voltage divider Reference voltage source are generated.
- the present use of the current-voltage converter 4 ensures that the measured voltage is always positive. Otherwise there is the negative input of the operational amplifier virtually to ground so that the total capacitor voltage over the combustion chamber measuring section and the measurement of the sliding value is not falsified.
- the present circuit according to FIGS. 5 and 6 acts as Power source for the ion current using the ion current measuring voltage generating device as a constant current source. Via the feedback resistor Rq the current / measuring voltage transformation ratio is set. So long the operational amplifier is not working in saturation, there is a linear relationship between the combustion chamber measuring range conductance and the output of the operational amplifier, which directly represents the measuring voltage.
- FIG. 7 shows a first known embodiment of the filter stage 5.
- Such a filter stage should preferably be provided with an output driver 6
- Decoupling can be used.
- a corresponding output driver is in FIG. 9 shown. The decoupling ensures immunity to interference.
- an active filter stage as shown in FIG. 8, can be used become.
- This filter stage forms a low-pass filter R5, C5 of the second to third order (cf. Tietze, Schenck, 9th ed., page 419) and can also be used as an anti-aliasing filter for digital signal processing in the combustion control unit (ECU) serve.
- An active filter stage, as used in FIG. 8, offers in combination with a current-voltage conversion device, as shown in Fig. 6 is an inexpensive implementation of the invention that is a great measure of Offers flexibility for the application.
- FIG 9 shows an optional driver stage in a first embodiment.
- a power interface as shown in FIG. 10 should preferably be used (see also baiting, Schenck, 9th ed., page 369).
- a power interface namely offers the advantage that potential potential offsets between the control unit and the combustion control unit close to the combustion chamber Have an influence on the signal transmission.
- An arrangement of the overall circuit is preferably in the vicinity of the combustion chamber and the ignition coil to strive for interference emission reasons. Otherwise they would have to Masses of the high voltage side over longer distances in the engine compartment.
- the compact circuit should be integrated alone or in combination with the associated ignition coil or coils on the ignition coil or in one to one Attachment control unit belonging to the cylinder group near the combustion chamber and ignition coil.
- the present invention offers in particular in the form of as a current / voltage converter trained measuring signal converter and the one serving as a current interface Output driver an easy way to generate a vehicle-friendly prepared ion current measurement signal.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
- Fig. 1
- eine schematische Übersicht einer Vorrichtung zur Erfassung eines Ionenstroms gemäß der vorliegenden Erfindung,
- Fig. 2
- eine erste Ausführungsform einer an sich bekannten Strommeßspannungserzeugungseinrichtung,
- Fig. 3
- eine zweite Ausführungsform einer an sich bekannten Ionenmeßspannungserzeugungseinrichtung.
- Fig. 4
- eine mögliche Ausführungsform eines Zündstrombypasses sowie einer Schutzschaltung, welche ebenfalls an sich bekannt sind,
- Fig. 5
- eine erste Ausführungsform eines erfindungsgemäßen Strom-/Spannungskonverters,
- Fig. 6
- eine zweite Ausführungsform eines erfindungsgemäßen Strom-/Spannungskonverters mit optionaler Bandbegrenzung und optionaler Diagnoseschaltung,
- Fig. 7
- eine erste Ausführungsform einer an sich bekannten Filterstufe,
- Fig. 8
- eine zweite Ausführungsform einer aktiven Filterstufe,
- Fig. 9
- eine erste Ausführungsform eines Ausgangstreibers und
- Fig. 10
- eine zweite Ausführungsform eines erfindungsgemäßen Ausgangstreibers in Form einer Stromschnittstelle.
Claims (5)
- Vorrichtung zur Erfassung eines Ionenstromes für eine Brennkraftmaschine, umfassend:eine Meßspannungserzeugungseinrichtung (1),einen mit der Meßspannungserzeugungseinrichtung (1) verbundenen Zündstrombypass (2) undeinen mit der Meßspannungserzeugungseinrichtung (1) und dem Zündstrombypass (2) verbundenen Meßsignalkonverter (4),
dadurch gekennzeichnet,daß als Meßsignalkonverter (4) ein Strom-/Spannungskonverter verwendet wird, der aus einem Operationsverstärker besteht, dessen negativer Eingang mit der Meßspannungserzeugungseinrichtung (1), dem Zündstrombypass (2) und über einen Widerstand mit dessen Ausgang, welcher das Meßsignal liefert, verbunden ist und dessen positiver Eingang auf Masse oder auf einem leicht erhöhten Potential liegt. - Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,daß ein Potentialversatz am positiven Eingang des Operationsverstärkers vorgesehen ist, der zur Diagnose der Schaltung verwendet wird. - Vorrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,daß der Ausgang des Strom-/Spannungskonverters mit einer Filterstufe (5), insbesondere einer aktiven Filterstufe, verbunden ist. - Vorrichtung nach Anspruch 3,
dadurch gekennzeichnet,daß ein Ausgangstreiber (6) vorgesehen ist, der mit dem Ausgang der Filterstufe (5) verbunden ist. - Vorrichtung zur Erfassung eines Ionenstromes für eine Brennkraftmaschine, umfassend:eine Meßspannungserzeugungseinrichtung (1),einen mit der Meßspannungserzeugungseinrichtung (1) verbundenen Zündstrombypass (2) undeinen mit der Meßspannungserzeugungseinrichtung (1) und dem Zündstrombypass (2) verbundenen Meßsignalkonverter (4),
dadurch gekennzeichnet,daß ein Ausgangstreiber (OP3) nach dem Meßsignalkonverter (4) derart vorgesehen ist, daß die Verbindung zwischen der Meßspannungserzeugungseinrichtung (1) und einem Ausgang der gesamten Vorrichtung eine Stromschnittstelle darstellt.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19922747 | 1999-05-18 | ||
| DE1999122747 DE19922747C2 (de) | 1999-05-18 | 1999-05-18 | Vorrichtung zur Erfassung eines Ionenstromes für eine Brennkraftmaschine |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1054154A2 true EP1054154A2 (de) | 2000-11-22 |
| EP1054154A3 EP1054154A3 (de) | 2002-08-21 |
| EP1054154B1 EP1054154B1 (de) | 2010-01-20 |
Family
ID=7908379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20000107750 Expired - Lifetime EP1054154B1 (de) | 1999-05-18 | 2000-04-11 | Vorrichtung zur Erfassung eines Ionenstromes für eine Brennkraftmaschine |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1054154B1 (de) |
| DE (2) | DE19922747C2 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10325318B4 (de) * | 2002-08-06 | 2009-07-16 | Mitsubishi Denki K.K. | Vorrichtung zur Erfassung von Bedingungen bei der Kraftstoffverbrennung in einer Brennkraftmaschine |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4359893A (en) | 1980-02-22 | 1982-11-23 | Robert Bosch Gmbh | Voltage source for ion current measurement in an internal combustion engine |
| DE3339569A1 (de) | 1983-11-02 | 1985-05-09 | Atlas Fahrzeugtechnik GmbH, 5980 Werdohl | Messschaltung zur ionenstrommessung |
| DE4138823C2 (de) | 1990-11-26 | 1995-11-09 | Mitsubishi Electric Corp | Vorrichtung zur Erfassung eines Ionenstroms |
| DE19730362A1 (de) | 1997-02-07 | 1998-08-27 | Mitsubishi Electric Corp | Einrichtung zur Feststellung des Verbrennungszustands für eine Brennkraftmaschine |
| DE19734039A1 (de) | 1997-02-18 | 1998-08-27 | Mitsubishi Electric Corp | Verbrennungszustands-Erfassungseinrichtung für eine Brennkraftmaschine |
| DE19733356A1 (de) | 1997-02-18 | 1998-09-03 | Mitsubishi Electric Corp | Verbrennungszustands-Erfassungsvorrichtung für einen Verbrennungsmotor |
| DE19733869A1 (de) | 1997-02-19 | 1998-09-10 | Mitsubishi Electric Corp | Vorrichtung zur Feststellung des Verbrennungszustands einer Brennkraftmaschine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR940010732B1 (ko) * | 1991-02-15 | 1994-10-24 | 미쓰비시덴키 가부시키가이샤 | 내연기관의 연소검출장치 |
| US5392641A (en) * | 1993-03-08 | 1995-02-28 | Chrysler Corporation | Ionization misfire detection apparatus and method for an internal combustion engine |
| JP3192541B2 (ja) * | 1994-01-28 | 2001-07-30 | 三菱電機株式会社 | 内燃機関用失火検出回路 |
| JP3477923B2 (ja) * | 1995-06-29 | 2003-12-10 | 三菱電機株式会社 | 内燃機関用燃焼状態検知装置 |
| JP3593217B2 (ja) * | 1996-09-04 | 2004-11-24 | トヨタ自動車株式会社 | 内燃機関のノッキング検出装置 |
| JP3423862B2 (ja) * | 1997-07-24 | 2003-07-07 | トヨタ自動車株式会社 | 内燃機関のノック制御装置 |
-
1999
- 1999-05-18 DE DE1999122747 patent/DE19922747C2/de not_active Expired - Fee Related
-
2000
- 2000-04-11 DE DE50015847T patent/DE50015847D1/de not_active Expired - Lifetime
- 2000-04-11 EP EP20000107750 patent/EP1054154B1/de not_active Expired - Lifetime
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4359893A (en) | 1980-02-22 | 1982-11-23 | Robert Bosch Gmbh | Voltage source for ion current measurement in an internal combustion engine |
| DE3339569A1 (de) | 1983-11-02 | 1985-05-09 | Atlas Fahrzeugtechnik GmbH, 5980 Werdohl | Messschaltung zur ionenstrommessung |
| DE4138823C2 (de) | 1990-11-26 | 1995-11-09 | Mitsubishi Electric Corp | Vorrichtung zur Erfassung eines Ionenstroms |
| DE19730362A1 (de) | 1997-02-07 | 1998-08-27 | Mitsubishi Electric Corp | Einrichtung zur Feststellung des Verbrennungszustands für eine Brennkraftmaschine |
| DE19734039A1 (de) | 1997-02-18 | 1998-08-27 | Mitsubishi Electric Corp | Verbrennungszustands-Erfassungseinrichtung für eine Brennkraftmaschine |
| DE19733356A1 (de) | 1997-02-18 | 1998-09-03 | Mitsubishi Electric Corp | Verbrennungszustands-Erfassungsvorrichtung für einen Verbrennungsmotor |
| DE19733869A1 (de) | 1997-02-19 | 1998-09-10 | Mitsubishi Electric Corp | Vorrichtung zur Feststellung des Verbrennungszustands einer Brennkraftmaschine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10325318B4 (de) * | 2002-08-06 | 2009-07-16 | Mitsubishi Denki K.K. | Vorrichtung zur Erfassung von Bedingungen bei der Kraftstoffverbrennung in einer Brennkraftmaschine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50015847D1 (de) | 2010-03-11 |
| EP1054154A3 (de) | 2002-08-21 |
| EP1054154B1 (de) | 2010-01-20 |
| DE19922747A1 (de) | 2000-11-30 |
| DE19922747C2 (de) | 2003-02-06 |
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