EP0943055A1 - Verfahren und vorrichtung zur erfassung des ionenstroms an brennkraftmaschinen - Google Patents
Verfahren und vorrichtung zur erfassung des ionenstroms an brennkraftmaschinenInfo
- Publication number
- EP0943055A1 EP0943055A1 EP98943636A EP98943636A EP0943055A1 EP 0943055 A1 EP0943055 A1 EP 0943055A1 EP 98943636 A EP98943636 A EP 98943636A EP 98943636 A EP98943636 A EP 98943636A EP 0943055 A1 EP0943055 A1 EP 0943055A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- ion current
- cylinder
- measurement
- offset correction
- 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
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 17
- 238000012937 correction Methods 0.000 claims abstract description 15
- 230000000873 masking effect Effects 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 17
- 238000005259 measurement Methods 0.000 claims description 17
- 238000011109 contamination Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims 6
- 238000006243 chemical reaction Methods 0.000 claims 2
- 238000003745 diagnosis Methods 0.000 claims 2
- 238000001914 filtration Methods 0.000 claims 2
- 239000013598 vector Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 108010076504 Protein Sorting Signals Proteins 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000000752 ionisation method Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
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 gases involved can be ionized by chemical and physical processes. If a voltage is applied to two electrodes that protrude from the gas in isolation, a current can be measured. This is referred to below as the ion current.
- the spark plug is usually used as a measuring probe. After applying a voltage between the center electrode and ground, the ion current can be measured after the ignition spark has subsided.
- Methods and components implemented in analog technology are used to evaluate the ion current signal, e.g. Short-term integrators, or processes and components implemented in digital technology for use. It is common to switch the measurement signals to these resources several cylinders in succession in order to save costs (multiplexing). The multiplexing is to be carried out without crosstalk between the cylinder channels. Furthermore, it must be prevented that the now shorter, cylinder-specific signal sections lead to a reduction in quality in the offset correction. Improvement of the safety and robustness of engine control and diagnostic functions by using these signals with an improved signal-to-noise ratio for the formation of features.
- the object of the invention is to provide a method which solves the problems mentioned.
- FIG. 1 The integration of the method and the device into the technical environment is illustrated in FIG. 1 in the form of a block diagram. Specific configurations of the essential signal processing blocks are explained in more detail in FIGS. 2 to 4, including signal examples.
- a unit (6) comprising an anti-aliasing filter (6.1) and an analog / digital converter (6.2) can be used to convert the ion current signal (s3), which is continuous in terms of time and value, into a digital signal sequence (s4). be used.
- a feature generator (7) extracts feature vectors (s5) specific to the cylinder from the digital signal sequence (s4). On the basis of these feature vectors (s5), misfiring occurs in the following classifier (8).
- a control unit (10) is required to control the ignition (1) and the means (4) according to the invention for offset correction and masking.
- FIG. 2 The method according to the invention for offset value correction and for spark masking of the ion current signal (sl) generated with the aid of means (3) is illustrated in FIG. 2.
- the signal (sl) is generated from the signal (sl) in such a way that the signal (sl) is looped through within a defined measurement window area and outside of it
- Measuring window range is switched to a constant substitute value (slb).
- the proportion of the spark in the ion current (sl) is masked with this substitute value (slb).
- the substitute value (slb) should be of the order of magnitude of the residual offset of the ion current signal
- the substitute value (slb) is determined individually for each cycle shortly before the ignition process by means of a sample and hold circuit (4.2).
- the ion current signal (sl) is not directly accessed for the determination of the hold value (slb), but rather a signal (sla) which has been cleaned out of interference.
- the interference correction of the signal (sl) can, for example, with an adapted filter
- This signal (s2) is characterized in that it is free of jumps and from ignition influences as well as a current offset caused by shunts.
- the subsequent signal multiplexing (5) is shown in FIG. Because of the special property of the cylinder-specific signals of the type of (s2), the signals from a plurality of cylinders can advantageously be combined in the form of temporal multiplexing to form a common signal (s3). In this case, due to the measurement window masking carried out in (4), a mutual influence of the multiplexed signals is excluded. This greatly reduces the resources required for signal transmission and the subsequent digitization.
- an anti-aliasing filter (6.1) can advantageously be switched into the signal path.
- this filter there is also the possibility of adapting the signal (s3) specifically to lower sampling rates.
- a discrete signal sequence (s4) is available at the output of the analog / digital converter (6.2).
- cylinder-specific feature vectors (s5) are formed from the signal (s4).
- a possible implementation of the feature generator (7) is shown as an example in FIG.
- the medium (7.1) is used to split the continuous data stream (s4) into the individual cylinder parts.
- a two-dimensional feature vector can then be formed for each cylinder-specific combustion cycle, consisting of the maximum ion current value and the short-term integral over the ion current measurement window.
- a downstream classifier (8) can make a distinction between regular burns and misfires on the basis of the feature vectors (s5) by comparison with correspondingly calculated threshold values.
- FIGS. 5 and 6 Based on the method presented, an alternative method, which is explained in more detail by FIGS. 5 and 6, can be used.
- This alternative method replaces the means 3, 4, 5 and 10 described in FIG. 1, uses the signal from the combustion process (2) and supplies a signal s8.3 which is processed in accordance with the invention in the same way as signal s3.
- an ion current is advantageously selected in the selection unit (8.1) from a plurality of different cylinders.
- This ion current signal is measured with means (8.2) before it experiences the offset correction and masking of the ignition spark according to the invention in means (8.3).
- the masking of the ignition spark and the offset correction are illustrated in FIG. 6.
- the means (8.3.5) are used to switch to a constant value previously defined according to the invention, which does not allow a jump in the signal (s8.3).
- a new offset value is first formed with the means (8.3.1) and (8.3.2), which is subtracted from the original signal from means (8.2) with means (8.3.4).
- the determination of the offset value is completed according to the invention before the ignition spark in the ion current signal becomes visible.
- the signal from the combustion process (2) can be cleaned up with an adapted filter (8.3.1) as an example.
- the determined value from means (8.3.1) is held in the sample and hold circuit (8.3.2) until the next switching of means (8.3.5) and (8.1), so that after means (8.3.5) an offset value-adjusted and interference-adjusted according to the invention Signal (s8.3) for further processing in means (6) is present.
- a control unit 8.4 is required for the timing of means 1, 8.1, 8.2 and 8.3.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19744163A DE19744163A1 (de) | 1997-10-07 | 1997-10-07 | Verfahren und Vorrichtung zur Erfassung des Ionenstroms an Brennkraftmaschinen |
DE19744163 | 1997-10-07 | ||
PCT/DE1998/001839 WO1999018350A1 (de) | 1997-10-07 | 1998-07-03 | Verfahren und vorrichtung zur erfassung des ionenstroms an brennkraftmaschinen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0943055A1 true EP0943055A1 (de) | 1999-09-22 |
EP0943055B1 EP0943055B1 (de) | 2003-10-01 |
Family
ID=7844778
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98943636A Expired - Lifetime EP0943055B1 (de) | 1997-10-07 | 1998-07-03 | Verfahren und vorrichtung zur erfassung des ionenstroms an brennkraftmaschinen |
Country Status (5)
Country | Link |
---|---|
US (1) | US6185500B1 (de) |
EP (1) | EP0943055B1 (de) |
JP (1) | JP2001507426A (de) |
DE (2) | DE19744163A1 (de) |
WO (1) | WO1999018350A1 (de) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10008553B4 (de) * | 2000-02-24 | 2009-01-29 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Auswertung eines Ionenstrom-Sensor-Signals einer Brennkraftmaschine |
US6498490B2 (en) | 2000-06-28 | 2002-12-24 | Delphi Technologies, Inc. | Ion sense ignition bias circuit |
JP3633580B2 (ja) * | 2002-04-17 | 2005-03-30 | 三菱電機株式会社 | 内燃機関の失火検出装置 |
JP3614149B2 (ja) * | 2002-04-17 | 2005-01-26 | 三菱電機株式会社 | 内燃機関の燃焼状態検出装置 |
DE10248227A1 (de) * | 2002-10-16 | 2004-04-29 | Volkswagen Ag | Verfahren und Vorrichtung zur Signalübertragung zwischen einem Zündsteuergerät und einem Motorsteuergerät |
US6951201B2 (en) * | 2002-11-01 | 2005-10-04 | Visteon Global Technologies, Inc. | Method for reducing pin count of an integrated coil with driver and ionization detection circuit by multiplexing ionization and coil charge current feedback signals |
US6998846B2 (en) * | 2002-11-01 | 2006-02-14 | Visteon Global Technologies, Inc. | Ignition diagnosis using ionization signal |
US20050028786A1 (en) * | 2003-08-05 | 2005-02-10 | Zhu Guoming G. | Ionization detection system architecture to minimize PCM pin count |
US6848421B1 (en) | 2003-09-12 | 2005-02-01 | Delphi Technologies, Inc. | Engine control method and apparatus using ion sense combustion monitoring |
US20090078027A1 (en) * | 2007-09-25 | 2009-03-26 | Lycoming Engines, A Division Of Avco Corporation | Aircraft engine cylinder assembly knock detection and suppression system |
ITRE20110060A1 (it) * | 2011-08-02 | 2013-02-03 | Emak Spa | "sistema di controllo della carburazione" |
DE102016218673B4 (de) * | 2016-09-28 | 2019-03-28 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Klopferkennung einer Brennkraftmaschine |
US11542899B2 (en) * | 2020-11-30 | 2023-01-03 | Matthew M Delleree | Ion sensing for vapor start control |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3128027A1 (de) * | 1981-07-16 | 1983-02-03 | Robert Bosch Gmbh, 7000 Stuttgart | "vorrichtung zum erkennen des klopfens bei brennkraftmaschinen" |
US5206809A (en) * | 1989-09-04 | 1993-04-27 | Nissan Motor Company, Limited | Heat measuring system for detecting knock in internal combustion engine |
KR940010732B1 (ko) * | 1991-02-15 | 1994-10-24 | 미쓰비시덴키 가부시키가이샤 | 내연기관의 연소검출장치 |
US5337716A (en) * | 1992-02-04 | 1994-08-16 | Mitsubishi Denki Kabushiki Kaisha | Control apparatus for internal combustion engine |
US5687082A (en) * | 1995-08-22 | 1997-11-11 | The Ohio State University | Methods and apparatus for performing combustion analysis in an internal combustion engine utilizing ignition voltage analysis |
DE19642654B4 (de) * | 1996-10-16 | 2004-02-05 | Daimlerchrysler Ag | Verfahren zur Regelung der einstellbaren Betriebsparameter einer direkteinspritzenden Brennkraftmaschine |
US5775298A (en) * | 1996-12-09 | 1998-07-07 | General Motors Corporation | Internal combustion engine control |
-
1997
- 1997-10-07 DE DE19744163A patent/DE19744163A1/de not_active Withdrawn
-
1998
- 1998-07-03 WO PCT/DE1998/001839 patent/WO1999018350A1/de active IP Right Grant
- 1998-07-03 DE DE59809800T patent/DE59809800D1/de not_active Expired - Fee Related
- 1998-07-03 US US09/319,041 patent/US6185500B1/en not_active Expired - Fee Related
- 1998-07-03 EP EP98943636A patent/EP0943055B1/de not_active Expired - Lifetime
- 1998-07-03 JP JP52073499A patent/JP2001507426A/ja active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO9918350A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0943055B1 (de) | 2003-10-01 |
DE59809800D1 (de) | 2003-11-06 |
US6185500B1 (en) | 2001-02-06 |
JP2001507426A (ja) | 2001-06-05 |
DE19744163A1 (de) | 1999-04-08 |
WO1999018350A1 (de) | 1999-04-15 |
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