EP0540878B1 - Dispositif pour l'évaluation d'impulsions d'allumage - Google Patents

Dispositif pour l'évaluation d'impulsions d'allumage Download PDF

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Publication number
EP0540878B1
EP0540878B1 EP92116797A EP92116797A EP0540878B1 EP 0540878 B1 EP0540878 B1 EP 0540878B1 EP 92116797 A EP92116797 A EP 92116797A EP 92116797 A EP92116797 A EP 92116797A EP 0540878 B1 EP0540878 B1 EP 0540878B1
Authority
EP
European Patent Office
Prior art keywords
ignition
threshold
pulses
sensed
amplitude
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.)
Expired - Lifetime
Application number
EP92116797A
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German (de)
English (en)
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EP0540878A3 (en
EP0540878A2 (fr
Inventor
Peter Dipl.-Ing. Etzold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to EP96109664A priority Critical patent/EP0732499B1/fr
Publication of EP0540878A2 publication Critical patent/EP0540878A2/fr
Publication of EP0540878A3 publication Critical patent/EP0540878A3/de
Application granted granted Critical
Publication of EP0540878B1 publication Critical patent/EP0540878B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02P17/02—Checking or adjusting ignition timing
    • F02P17/04—Checking or adjusting ignition timing dynamically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
    • F02P17/02—Checking or adjusting ignition timing

Definitions

  • the invention is based on methods for Evaluation of ignition pulses from a spark-ignited Internal combustion engine according to the genus of Claim 1.
  • the trigger pulse is from an ignition pulse of a reference cylinder derived.
  • the trigger threshold is adjustable with a trim potentiometer.
  • the Trim potentiometer is used when adjusting the Ignition voltage oscilloscope adjusted. A change the trigger threshold in later operation is not intended.
  • the invention is based on the object Process for evaluating ignition pulses spark-ignited internal combustion engine specify which has a high level of operational reliability.
  • the procedure provides that the Threshold is variable and that the threshold is on a value is set at which the temporal Distances of at least two successive ones Firing pulses within a predetermined ratio lie.
  • the method has the advantage that through an adaptive determination of the threshold, above which the ignition pulses are evaluated a high level of operational reliability in different Ignition systems is reached.
  • the increasing Dimensions used distributorless ignition systems that some contain several independent ignition circuits, can deviations in the amplitudes the ignition pulses between the individual ignition circuits exhibit. Even with such ignition systems is a reliable evaluation of ignition pulses given by the variable threshold.
  • the method according to the invention enables the determination of the threshold such that the relevant Ignition pulses just detected and interference pulses, whose amplitude is lower, suppressed become. Glitches, their amplitude in height the expected ignition pulses or above are from the inventive method recognized and there may be a corresponding message be delivered.
  • the evaluation of the time intervals at least two successive impulses to Setting the threshold assumes that the time intervals of the expected ignition pulses are within a predetermined ratio. At constant engine speed the time intervals are the same, accordingly a ratio of 1: 1.
  • the specification of a Range of the ratio, for example of 1: 0.7 to 1: 1.1 enables the consideration of Acceleration processes.
  • One area boundary corresponds to the ratio of: 1: 0.7 one positive acceleration and the other Zone of 1: 1.1 negative acceleration.
  • the information provided so far apply only to symmetrical motors where the top dead centers of the cylinders related to a crankshaft rotation are evenly distributed.
  • a time offset of the Firing times of successive cylinders corresponds when determining the ratio be taken into account.
  • a normalization of the time intervals between successive Ignition processes can also occur with asymmetrical Motors a ratio of 1: 1 at constant Speed are taken as a basis. Instead of normalization can of course do that too actual ratio at constant speed Starting point can be selected, which then from 1: 1 deviates, with the range of predefined ratio changes accordingly.
  • Execution example is the review of the Ratio of the time intervals at least two successive pulses and then the result is through evaluation the number of ignition pulses within one Motor cycle checked.
  • a variant of an exemplary embodiment is firstly the determination of the Number of firing pulses within the Ignition pulses of the reference cylinder given interval provided, followed by the result by evaluating the time intervals successive impulses checked becomes.
  • In the embodiment is another Increased operational security by expanding the plausibility checks.
  • each encoder signal that is derived from different donors each a separate threshold is assigned.
  • Another development provides that the signals detected by different sensors first be summarized and that the pulses expected one after the other in each case a separate threshold in chronological order is assigned.
  • An embodiment of the invention Procedure provides that to set the threshold the shortest detected distances between successive Impulses are used. With this measure it is ensured that the ignition pulses can also be fully detected if periodically recurring ignition pulses occur, their amplitude compared to the other ignition pulses is increased.
  • FIG. 1 shows a block diagram of a measuring device, connected to an ignition system 2 shows a time profile of Ignition pulses in an ignition system and Figure 3 shows a block diagram of a measuring device.
  • FIG An ignition system 10 is shown in FIG is connected to a measuring device 11. Ignition system 10 and meter 11 are dashed lines from each other drawn separately.
  • the ignition system 10 contains two ignition spikes 12, 13, the first primary connections 14, 15, second primary connections 16, 17, first secondary connections 18, 19 and second secondary connections 20, 21 have.
  • the secondary connections 18, 19, 20, 21 of the ignition coils 12, 13 each connected to a ground 22 Spark plugs 23, 24, 25. 26 connected.
  • the first Primary connections 14, 15 of the ignition coils 12, 13 are each connected to a switch 27, 28, which are arranged in an ignition switching device 29 are.
  • the second primary connections 16, 17 of the Ignition coils 12, 13 lead to an ignition switch 30, the ignition system 10 with a Ground 22 connected battery 31 connects.
  • the two switches 27, 28 in the ignition switching device 29 are also each connected to ground 22.
  • the one in the border of the ignition switchgear 29 points entered mean that the Ignition switch 29 next to the two shown Switches 27, 28 contain further such switches can.
  • the points in the connecting line also mean the second primary connections 16, 17 of the ignition coils 12, 13 that this line too can lead to further ignition coils.
  • the measuring lines 34, 35 are with an evaluation arrangement 36 and each with comparators 37, 38 connected.
  • the comparators 37, 38 give each output signals 39, 40 to a signal processing Arrangement 41 from.
  • the arrangement 41 in turn outputs an output signal 42 to the evaluation arrangement 36 from.
  • the signal processing Arrangement 41 also receives input signals from a cylinder counter 43 and a reference signal generator 44 fed.
  • the reference signal generator 44 is via a further measuring line 45 and via a further contact 46 with a line connected, which leads to the spark plug 26.
  • a waveform is dependent shown by the time T in the ignition system 10 occurs.
  • the voltage U is given to the Contacts 32, 33 occurs.
  • the waveform can either make contact at first 32 or at the other contact 33 occur. It is also possible to turn on the signals summarize the contacts 32, 33, so that the waveform shown in Figure 2 from the Superposition of two or more signals arises.
  • the signal is called the primary ignition signal designated.
  • Ignition pulses have the reference symbols 51, 52, 53, 54. Following the ignition pulse 51, 52, 53, 54 follows the burning phase 55, during which the spark plug 23, 24, 25, 26 a gas discharge is present. One follows the burning phase 55 Opening phase 56 during which the switch 27, 28 is open. With the beginning of the Closing phase 50 is a new ignition process initiated.
  • FIG 2 are a first and a second Threshold 57, 58 entered, the first Threshold 57 of the first, third and fourth firing pulses 51, 53, 54 and the second threshold 58 of all ignition pulses 51, 52, 53, 54 exceeded becomes. Furthermore, the time intervals between the individual ignition pulses 51, 52, 53, 54 registered. An interval begins where the amplitude of the ignition pulses 51, 52, 53, 54 either the first threshold 57 or the second Threshold 58 reaches and ends at the corresponding one Place of the following impulse. As Intersection points of the ignition pulses 51, 52, 53, 54 with the thresholds 57, 58 are each increasing Edge 59 of the ignition pulses 51, 52, 53, 54 is provided.
  • a first time interval 60 is between the first and third firing pulses 53, based on the first threshold 57.
  • a second time interval 61 lies between the third and fourth firing pulse 53, 54, also related to the first threshold 57.
  • Third, fourth and fifth time intervals 62, 63, 64 are each between two successive firing pulses 51, 52; 52, 53; 53, 54, each based on the second threshold 58.
  • FIG 3 is another block diagram of the Measuring device 11 shown. Matching parts in Figures 1 and 3 have the same reference numerals.
  • the measurement lines 34, 35 become a signal combining arrangement 70 forwarded which output an output to a comparator 71 outputs the output signal 72 of a signal processing Arrangement 73 is supplied.
  • the methods according to the invention are based on the block diagrams shown in Figures 1 and 3 in conjunction with that shown in Figure 2 Signal curve explained in more detail:
  • the ignition pulses occurring in the ignition system 10 51, 52, 53, 54 are on the contacts 32, 33 tapped. Instead of the one in FIG shown galvanic connection of the measuring lines 34, 35 with the first primary connections 14, 15 of the ignition coils 12, 13 is also a capacitive or an inductive coupling possible.
  • the Firing pulses 51, 52, 53, 54 can also on others Place the ignition system 10, for example tapped the secondary side of the ignition coils 12, 13 become. Instead of that shown in Figure 2 primary ignition signal curve then results for example a secondary ignition signal curve, being the characteristic firing pulses 51, 52, 53, 54 are however present.
  • the measuring lines leading to the measuring device 11 34, 35 are usually first in a signal conditioning circuit, that in Figure 1 is not is entered for further signal processing prepared.
  • a signal conditioning circuit a voltage divider, an impedance converter or an amplifier circuit contain.
  • the signals are then of the evaluation arrangement 36, the a qualitative or quantitative analysis of the signals makes. Some of these evaluations hang from time to time. Such evaluations are for example the determination of ignition times of the individual cylinders in chronological order during an engine cycle. Depending on the evaluation of time is instead of that shown in Figure 2 analog signal uses a digital signal that by a defined level or a defined Edge devices for determining Times start or stop.
  • the output signal 42 the signal processing arrangement 41 is a such a signal with which the evaluation arrangement 36 carries out the time-related evaluations.
  • the Signal 42 contains, for example, pulses at each firing pulse 51, 52, 53, 54 to be triggered. So from the one shown in Figure 2 Signal derived reliable pulses is a careful definition of the Threshold 57, 58 required if exceeded by the ignition pulses 51, 52, 53, 54 one pulse each is triggered. According to the invention it is initially provided that the threshold 57, 58 is variable. As equivalent to this measure is considered that the threshold 57, 58 is fixed is specified and that the amplitude of the signal is changed according to the order of the State of the art mentioned at the beginning.
  • the on the measuring lines 34, 35 are lying signals each supplied to the comparators 37, 38.
  • the signal processing arrangement 41 sets the Threshold 57, 58 initially to a high value fixed, depending on the determined time Intervals and, if necessary, depending on the counting results is reduced.
  • Vedahrens provides that the temporal Distances of at least two successive ones Firing pulses 51, 52; 52, 53; 53, 54 within of a predeterminable ratio.
  • Threshold 57 corresponds to the first one time interval 60 between the first and third firing pulse 51, 53 and then the second time interval 61 between the third and fourth firing pulse 53, 54 determined.
  • the relationship the time intervals 60, 61 are then for example with 2: 1.
  • the signal processor recognizes Arrangement 41 a faulty Operating status.
  • the threshold 57, 58 is lowered. Soba! D the threshold reaches a value has, for example, with that entered in Figure 2 second threshold 58 coincides the signal processing arrangement 41 the time intervals 62, 63, 64 between successive Firing pulses 51, 52; 52, 53; 53, 54. Since these distances 62, 63, 64 within the predetermined Ratio, the corresponding Pulses as output signal 42 to the Evaluation arrangement 36 issued.
  • the signal processing Arrangement 41 With a determination the variable threshold to a value that the corresponds to the first threshold 57, the signal processing Arrangement 41 by evaluating the Ratio of the time interval 60 between the first and third firing pulses 51, 53 and a further distance, not shown in Figure 2 between the third firing pulse 53 and one determine the non-energized fifth ignition pulse, that the distances within the given Ratio lies, although an incorrect operating state is present. With the advantageous training this case is excluded.
  • variable threshold in Levels can be specified.
  • a second Threshold 57, 58 is set to a value at the number of firing pulses 51, 52. 53, 54 within an interval defined by the Distance between two successive pulses of the Reference cylinder is given with an expected Number matches.
  • the method according to the further development is the detection of ignition pulses Reference cylinder.
  • Figure 1 it is assumed that the spark plug 26 for ignition of the reference cylinder is provided.
  • the measuring line 45 is therefore on the line leading to the spark plug 26 connected to the further contact 46. Instead of the galvanic shown Connection is both capacitive and one inductive coupling possible.
  • the further measuring line 45 leads the tapped signal to the reference signal generator 44 to which an output signal outputs the signal processing arrangement 41.
  • Reference signal generator contains, for example Voltage divider, an impedance converter and / or an amplifier and a comparator.
  • Reference signal generator 44 is also intended to be pulse-shaped Output signal as the comparators 37, 38, by comparing the input signal arises with a threshold.
  • threshold is much easier here because the input signal can be clearly identified is.
  • the reference signal from a trigger gun that detects the in the secondary circuit flowing spark plug current or at least whose changes are recorded.
  • the reference signal generator 44 gives rise to everyone for example the first firing pulse 51 a signal to the signal processing arrangement 41 from. So that the arrangement 41 within a Determine the ignition cycle of the engine cycle the number of cylinders must be communicated to her become.
  • the cylinder counter 43 is provided for example from an input is controlled.
  • the variable second threshold 57, 58 becomes set during operation so that the signal processing arrangement 41, starting from first ignition pulse 51, four ignition pulses counts until again the first ignition pulse occurs, which the Ignition pulse for the reference cylinder corresponds. in the An example is a four-cylinder internal combustion engine be accepted.
  • the signal processing arrangement 73 gives way from the arrangement 41 shown in FIG the specification of the threshold for the comparator 71 onwards. Instead of specifying a uniform
  • the threshold is preferably the specification of a time-changing threshold is provided, whereby the threshold was expected for either individual Firing pulses or groups of firing pulses can be set. From previous ones Firing pulses can advance the threshold be given at a time after which the next ignition pulse is expected.
  • the methods according to the invention can both be implemented in analog circuit technology as well as run in a microprocessor system.
  • a digital implementation in a microprocessor system are the detected signals first undergo an analog / digital conversion and then the comparison operations and Evaluation procedure carried out in the number range.

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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)

Claims (8)

  1. Procédé pour l'exploitation d'impulsions d'allumage d'un moteur à combustion interne à allumage commandé, dans lequel l'amplitude des impulsions détectées est comparée à un seuil prédéfini et on n'exploite que les impulsions qui dépassent ce seuil,
    caractérisé en ce que
    le seuil (57, 58) ou l'amplitude des impulsions détectées, est variable, et
    le seuil (57, 58) ou l'amplitude des impulsions détectées, est fixé sur une valeur pour laquelle les intervalles dans le temps (62, 63, 64) d'au moins deux impulsions d'allumage consécutives (52, 51 : 53, 54, 53) se trouvent à l'intérieur d'un rapport prédéfini.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    l'un des deux seuils (57, 58) ou l'amplitude des impulsions détectées est variable et,
    le deuxième seuil (57, 58) ou l'amplitude des impulsions détectées est fixé sur une valeur pour laquelle le nombre des impulsions d'allumage détectées (51, 52, 53, 54) à l'intérieur d'un intervalle qui est donné par l'écart entre deux impulsions d'allumage consécutives (51) d'un cylindre de référence, coïncide avec un nombre attendu.
  3. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    le seuil (57, 58) peut être prédéfini par étapes.
  4. procédé selon la revendication 3,
    caractérisé en ce que
    l'on prévoit deux étapes (57, 58).
  5. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    les impulsions d'allumage (51, 52, 53, 54) sont détectées par des dispositifs séparés (32, 34 ; 33, 35) et
    en ce qu'à chacun de ces dispositifs (32, 34 : 33, 35) est associé un seuil séparé (57, 58).
  6. Procédé selon la revendication 5,
    caractérisé en ce que
    les impulsions délivrées par plusieurs dispositifs (32, 34 ; 33, 35) sont rassemblées, et
    le seuil (57, 58) est converti en une suite temporelle avant l'impulsion d'allumage (51, 52, 53, 54) attendue.
  7. Procédé selon la revendication 1 et selon l'une des revendications 2 à 6,
    caractérisé en ce qu'
    on détermine le rapport dans une zone qui va de 1:0,7 à 1:1,1.
  8. Procédé selon la revendication 1 et selon l'une des revendications 2 à 7,
    caractérisé en ce que
    les intervalles détectés les plus courts (62, 63, 64) entre des impulsions d'allumage consécutive (52, 51 ; 52, 54, 53) servent de base lors de la fixation des seuils (57, 58).
EP92116797A 1991-11-02 1992-10-01 Dispositif pour l'évaluation d'impulsions d'allumage Expired - Lifetime EP0540878B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96109664A EP0732499B1 (fr) 1991-11-02 1992-10-01 Dispositif pour l'évaluation d'impulsions d'allumage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4136232A DE4136232A1 (de) 1991-11-02 1991-11-02 Verfahren zum auswerten von zuendimpulsen
DE4136232 1991-11-02

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP96109664A Division EP0732499B1 (fr) 1991-11-02 1992-10-01 Dispositif pour l'évaluation d'impulsions d'allumage

Publications (3)

Publication Number Publication Date
EP0540878A2 EP0540878A2 (fr) 1993-05-12
EP0540878A3 EP0540878A3 (en) 1994-08-10
EP0540878B1 true EP0540878B1 (fr) 1999-01-13

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Application Number Title Priority Date Filing Date
EP92116797A Expired - Lifetime EP0540878B1 (fr) 1991-11-02 1992-10-01 Dispositif pour l'évaluation d'impulsions d'allumage
EP96109664A Expired - Lifetime EP0732499B1 (fr) 1991-11-02 1992-10-01 Dispositif pour l'évaluation d'impulsions d'allumage

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Application Number Title Priority Date Filing Date
EP96109664A Expired - Lifetime EP0732499B1 (fr) 1991-11-02 1992-10-01 Dispositif pour l'évaluation d'impulsions d'allumage

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EP (2) EP0540878B1 (fr)
DE (3) DE4136232A1 (fr)
ES (2) ES2128334T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3925221A1 (de) * 1989-07-29 1991-01-31 Vdo Schindling Verfahren und schaltungsanordnung zur ueberwachung von funkenstrecken
DE4223713A1 (de) * 1992-07-18 1994-01-20 Bosch Gmbh Robert Vorrichtung zum Erfassen eines Signales

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2234957A1 (de) * 1972-07-15 1974-01-31 Bosch Gmbh Robert Schaltungsanordnung zur gewinnung von elektrischen triggersignalen
DE2343895A1 (de) * 1973-08-31 1975-03-13 Bosch Gmbh Robert Verfahren und einrichtung zur ueberpruefung der zuendanlage von brennkraftmaschinen
DE2431799B2 (de) * 1974-07-02 1977-06-02 Gebr. Hofmann Kg Maschinenfabrik, 6100 Darmstadt Schaltung zur aufbereitung impulsfoermiger messignale eines induktiven gebers, der den zuendstrom in einer zuendanlage eines ottomotors abgreift
JPS5810580B2 (ja) * 1979-05-14 1983-02-26 自動車機器技術研究組合 自動車の点火装置の診断装置
DE3400786A1 (de) * 1984-01-12 1985-07-18 Robert Bosch Gmbh, 7000 Stuttgart Zuendungsmessgeraet
DE3505440A1 (de) * 1985-02-16 1986-08-21 Hermann, Horst, 8501 Oberasbach Verfahren zur laufzustandsanalyse an verbrennungsmotoren mit elektrischer zuendanlage sowie vorrichtung zur durchfuehrung des verfahrens
IT1206836B (it) * 1987-01-09 1989-05-11 Fiat Auto Spa Procedimento e dispositivo per il rilievo e la segnalazione di anomalie di funzionamento dell impianto di accensione di motori a combustione interna particolarmente per autoveicoli provvisti di marmitta catalitica
US4788505A (en) * 1987-09-11 1988-11-29 Pacific Northwest Electronics Advance reference cylinder trigger generator
US4847562A (en) * 1987-09-11 1989-07-11 Pacific Northwest Electronics Ignition coil primary winding signal processing system
DE3735234C2 (de) * 1987-10-17 1995-05-11 Opel Adam Ag Zündüberwachungseinrichtung zur Erkennung von Zündaussetzern in einer Zündanlage für einen Verbrennungsmotor für ein Kraftfahrzeug
DE4010839A1 (de) * 1990-04-04 1991-10-10 Bosch Gmbh Robert Vorrichtung zur erzeugung eines triggersignals aus zuendimpulsen einer zuendanlage
DE4011521A1 (de) * 1990-04-10 1991-10-17 Bosch Gmbh Robert Schaltung und verfahren zum ueberwachen der funktion einer kraftfahrzeug-zuendanlage
US5132625A (en) * 1990-10-01 1992-07-21 Actron Manufacturing Company Distributorless ignition adapter for diagnostic oscilloscopes

Also Published As

Publication number Publication date
EP0540878A3 (en) 1994-08-10
EP0732499A2 (fr) 1996-09-18
EP0732499B1 (fr) 2000-07-26
ES2150619T3 (es) 2000-12-01
EP0540878A2 (fr) 1993-05-12
ES2128334T3 (es) 1999-05-16
DE59209617D1 (de) 1999-02-25
EP0732499A3 (fr) 1997-10-29
DE59209853D1 (de) 2000-08-31
DE4136232A1 (de) 1993-05-06

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