EP0498046A2 - Dispositif de saisie de signaux - Google Patents

Dispositif de saisie de signaux Download PDF

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Publication number
EP0498046A2
EP0498046A2 EP91119400A EP91119400A EP0498046A2 EP 0498046 A2 EP0498046 A2 EP 0498046A2 EP 91119400 A EP91119400 A EP 91119400A EP 91119400 A EP91119400 A EP 91119400A EP 0498046 A2 EP0498046 A2 EP 0498046A2
Authority
EP
European Patent Office
Prior art keywords
signals
signal
inputs
input
ignition
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
Application number
EP91119400A
Other languages
German (de)
English (en)
Other versions
EP0498046B1 (fr
EP0498046A3 (en
Inventor
Karl-Heinz Dittmann
Peter Dipl.-Ing. Etzold
Uwe Dipl.-Ing. Fischer
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
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0498046A2 publication Critical patent/EP0498046A2/fr
Publication of EP0498046A3 publication Critical patent/EP0498046A3/de
Application granted granted Critical
Publication of EP0498046B1 publication Critical patent/EP0498046B1/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
    • F02P17/10—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
    • F02P17/02—Checking or adjusting ignition timing

Definitions

  • the invention relates to a device for detecting signals according to the preamble of the main claim.
  • a device for diagnosing distributorless ignition systems is known. Diodes are connected to the ignition coils of the ignition system and transmit the signals occurring in the ignition coils, decoupled from one another, to a signal combining point. The combined signals are processed in an evaluation circuit. A voltage measurement at the signal junction is always subject to an error caused by the diodes. At high speeds of the internal combustion engine operated with the ignition system, the closing phase of an ignition circuit can be covered by the ignition process of another ignition circuit. The analysis of the signal that can be picked up from an ignition coil as a function of time is therefore not possible in all operating situations.
  • the invention has for its object to develop a device for detecting signals in such a way that the most complete possible analysis of the signals is possible.
  • the measure according to the invention that additional means can be provided for selecting one of the signals has the advantage that merged and individual signals can be analyzed simultaneously. Additional taps at the signal sources are not necessary.
  • the device according to the invention enables a comprehensive analysis of the signals occurring at the signal sources with little additional effort.
  • a cost-effective implementation provides for manual actuation of the additional selection means. An operator selects the signal to be evaluated individually.
  • Another advantageous embodiment provides for the actuation of the selection means by a signal processing arrangement which is available for evaluating the merged and / or the individual signals.
  • the selection of the individual signal can therefore be carried out automatically depending on the analysis to be carried out.
  • a targeted selection of the individual signal by an operator is also possible via the signal processing arrangement.
  • a particularly advantageous embodiment provides that the means for merging the signals contain a first and second group of decoupling means, in particular diodes. With the first group it is then possible to combine those signals which have a positive potential with respect to a reference potential, while the second group combines the signals with a negative potential.
  • Simple, unshielded cables are provided as input lines of the device according to the invention, which result in cost advantages over shielded cables.
  • a coupling between the input lines due to stray capacities cannot be ruled out.
  • This capacitive coupling would, in particular on a non-connected input line, simulate a signal that is coupled in from another input line.
  • An advantageous further development of the device according to the invention therefore provides an input circuit with capacitors which considerably reduces the coupled signals.
  • the capacitors form a capacitive voltage divider with the stray capacitances, which reduces the signal amplitudes according to the division ratio.
  • the device according to the invention is particularly suitable for use in diagnostic devices for motor vehicles.
  • multiple signal sources can often be observed at the same time, the signals of which are in part time-coupled because the different devices in the motor vehicle partially influence one another.
  • the device according to the invention is suitable for use in diagnosing ignition systems with more than one ignition coil.
  • the combined signal enables, for example, the determination of the speed and the concentricity of the internal combustion engine, while the evaluation of the individual signal simultaneously permits a precise voltage measurement or an evaluation of temporal relationships, for example the determination of the closing time of an ignition switching element.
  • a device according to the invention for detecting signals is shown in the figure.
  • an ignition system 10 is shown, which is separated by a broken line from a device 11 according to the invention for detecting signals.
  • the device 11 is referred to below as the diagnostic device 11.
  • the ignition system 10 contains two ignition coils 12, 13, each having first primary connections 14, 15, second primary connections 16, 17, first secondary connections 18, 19 and second secondary connections 20, 21.
  • the two secondary connections 18, 20 of the first ignition coil 12 are each connected to spark plugs 22, 23, which are connected to a ground 24.
  • the first secondary connection 19 of the second ignition coil 13 is connected to the first primary connection 15, while the second secondary connection 21 is connected to a further spark plug 25, which is also connected to ground 24.
  • the second primary connections 16, 17 are connected to an ignition switch 26, which establishes a connection to an energy source 27, which is connected to ground 24.
  • the first primary connections 14, 15 of the ignition coil 12, 13 are each connected to ignition switching elements 28, 29, which are arranged in an ignition switching device 30.
  • the inputs 33, 34 are also connected to selection means 41 which apply one of the input signals to an output 42.
  • the output 42 is at the same time the second input of a signal processing arrangement 43 which contains a second input 44 which is connected to switching means 45 which connect the second input 44 to either the first or second signal combination point 37, 40.
  • the selection means 41 have an input 46, via which the selection of a signal takes place.
  • An output 47 of the signal processing arrangement 43 and a manual input 48 are provided for selection.
  • the inputs 33, 34 are also each connected to capacitors 49, 50, which are connected to ground 24.
  • the capacitors 49, 50 act together with a capacitor 51 which is located on input lines between the inputs 33, 34.
  • the capacitor 51 is shown in dashed lines in the figure because it occurs as stray capacitance between input lines.
  • the capacitor 51 is not present as a discrete component.
  • the device according to the invention for detecting signals works as follows:
  • the ignition system 10 is provided, for example, for operating an internal combustion engine (not shown in the figure).
  • the ignition system 10 contains more than one ignition coil 12, 13.
  • two spark plugs 22, 23 are connected to the first ignition coil 12, which simultaneously emit a spark.
  • only one spark plug 25 is connected to the second ignition coil 13.
  • the first primary connections 14, 15 of the ignition coils 12, 13 can be switched to ground 24 using the ignition switching elements 28, 29.
  • the ignition system 10 is not limited to any particular type. It can be a thyristor, transistor or high-frequency ignition system.
  • the first primary connections 14, 15 of the ignition coils 12, 13 are provided as signal sources, at which signals are to be recorded, and have taps 31, 32 for connecting the diagnostic device 11.
  • the first group of decoupling means 35, 36 which are preferably implemented as diodes, bring the signals at the inputs 33, 34 together at the first signal combining point 37, while the second group 38, 39 of decoupling means 38, 39, which also preferably as Diodes are implemented which combine signals at the second signal combining point 40.
  • the first diode group 35, 36 combines the input signals 33, 34, which are positive, and the second diode group 38, 39 combines the input signals 33, 34, which are negative with respect to a reference potential.
  • the reference potential itself and the required working resistances of the diodes 35, 36; 38, 39 are not shown in the figure for reasons of simplification.
  • the switching means 45 either feed the combined signal located at the first or at the second signal combining point 37, 40 to the second input 44 of the signal processing arrangement 43.
  • the switching means 45 can be operated either manually or electrically. For example, it could be controlled as a function of the potential at the first or second signal combination point 37, 40. Furthermore, it is possible to control the first switching means 45 from the signal processing arrangement 43.
  • the signal processing arrangement 43 carries out a signal evaluation as a function of a signal which is composed of the signals at the inputs 33, 34.
  • the signals at the inputs 33, 34 are fed to the selection means 41, which select one from the input signals and make them available at the output 42.
  • the selection means 41 are referred to as multiplexers, in particular as analog signal multiplexers.
  • one of the input signals is switched through to output 42.
  • the selection can, for example, be made directly by an operator via the manual input 48.
  • the input signal selection in the multiplexer 41 can also be carried out by the signal processing arrangement 43 via a control signal at the output 47.
  • the selection made by the arrangement 43 can be provided, for example, as a function of certain diagnostic routines.
  • the signal processing arrangement 43 can contain a further manual input, not shown in the figure, for the targeted search for a signal.
  • the signal at the output 42 which corresponds exactly to an input signal, can be analyzed in the signal processing arrangement to which it is supplied as the first input signal, simultaneously with the combined signal at the second input 44.
  • the device according to the invention for acquiring signals can advantageously be used wherever the signals to be tapped from more than one signal source are to be combined and analyzed individually at the same time.
  • the device according to the invention is suitable for use in the diagnosis of motor vehicles. In this application, multiple signals often occur, which are coupled to one another via the devices present in the motor vehicles.
  • the device according to the invention is particularly suitable for use in the diagnosis of ignition systems 10 with more than one ignition coil.
  • the speed, the concentricity or the totality of the ignition processes of the internal combustion engine are represented from the signals present at the signal combination points 37, 40.
  • the first diode group 35, 36 is used in particular to evaluate the signals which occur during the opening phase of the ignition switching elements 28, 29, while the signals combined with the second diode group 38, 39 permit diagnosis during the closing phase of the elements 28, 29.
  • the analysis of individual signals at the inputs 33, 34 is simultaneously desirable or necessary. For example, a voltage measurement is provided on the first or second tap 31, 32. With this voltage measurement, for example, the residual voltage can be measured during the closing phase of the elements 28, 29.
  • the signals at the inputs 33, 34 are passed on to the output 42 by the multiplexer 41 in an unadulterated manner. Additional connections to the signal sources are not required. In addition to a precise voltage measurement, a temporal analysis of the signals at the inputs 33, 34 is also possible. In the example of the diagnosis of ignition systems, the closing phases of the elements 28, 29 can each be evaluated separately. Such an evaluation would not be possible in all operating states with the signals only at the signal merging points 37, 40, because at high speeds the elements 28, 29 may overlap, which prevents precise evaluation.
  • the lines that connect the taps 31, 32 to the inputs 33, 34 are, for cost reasons, preferably simple cables without shielding. Capacitive couplings occur between these lines, which are symbolically entered in the figure by the capacitor 51. The capacitive coupling leads to crosstalk of signals from one line to the other, which can lead to misinterpretations of a supposed measurement result, especially when lines are not connected.
  • capacitors 49, 50 are therefore connected to ground 24 at the inputs 33, 34.
  • the capacitors 49, 50 form with the capacitor 51, which represents the stray capacitances, a capacitive voltage divider, which reduces the signal components at the inputs 33, 34 with correspondingly open inputs according to the division ratio. This capacitive voltage division does not affect the regular input signals.

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)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
EP91119400A 1991-02-04 1991-11-14 Dispositif de saisie de signaux Expired - Lifetime EP0498046B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4103310 1991-02-04
DE4103310A DE4103310A1 (de) 1991-02-04 1991-02-04 Vorrichtung zum erfassen von signalen

Publications (3)

Publication Number Publication Date
EP0498046A2 true EP0498046A2 (fr) 1992-08-12
EP0498046A3 EP0498046A3 (en) 1993-02-10
EP0498046B1 EP0498046B1 (fr) 1999-02-03

Family

ID=6424348

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119400A Expired - Lifetime EP0498046B1 (fr) 1991-02-04 1991-11-14 Dispositif de saisie de signaux

Country Status (3)

Country Link
EP (1) EP0498046B1 (fr)
DE (2) DE4103310A1 (fr)
ES (1) ES2129024T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4242177A1 (de) * 1992-12-15 1994-06-16 Teves Gmbh Alfred Schaltungsanordnung zur Überwachung einer Vielzahl von Spulen

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1568855A (fr) * 1967-01-06 1969-05-30
GB2064137A (en) * 1979-11-27 1981-06-10 Ti Crypton Ltd Engine analyser
US4306187A (en) * 1979-12-04 1981-12-15 Kinder Joseph C Apparatus for visually monitoring ignition voltages
GB2116329A (en) * 1982-03-10 1983-09-21 Daimler Benz Ag Apparatus for recognising misfiring in an external ingition internal combustion machine
GB2172115A (en) * 1985-03-07 1986-09-10 Fki Crypton Limited Ignition analysers
US4724702A (en) * 1986-12-08 1988-02-16 General Motors Corporation LPP sensor interface circuit
US4758791A (en) * 1986-11-28 1988-07-19 United Technologies Corporation Universal secondary high voltage sensor
EP0307503A1 (fr) * 1986-03-10 1989-03-22 Cross-Check Technology, Inc. Structure quadrillée de test, par recoupement, pour le test de circuits intégrés
US4847563A (en) * 1988-07-12 1989-07-11 Snap-On Tools Corporation Distributorless ignition interface
DE3841739A1 (de) * 1988-12-10 1990-06-13 Bosch Gmbh Robert Vorrichtung zum erfassen von zuendsignalen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1540264A (en) * 1975-12-16 1979-02-07 Sun Electric Corp Engine test and display apparatus
DE2723536C3 (de) * 1977-05-25 1980-10-23 Daimler-Benz Ag, 7000 Stuttgart Vorrichtung zum Prüfen verschiedenartiger Kabelsätze
DE3009997A1 (de) * 1980-03-13 1981-10-08 Siemens AG, 1000 Berlin und 8000 München Aktiver kapazitiver spannungsteiler
US4825392A (en) * 1986-08-20 1989-04-25 Freeman Mark S Dual function DMM display

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1568855A (fr) * 1967-01-06 1969-05-30
GB2064137A (en) * 1979-11-27 1981-06-10 Ti Crypton Ltd Engine analyser
US4306187A (en) * 1979-12-04 1981-12-15 Kinder Joseph C Apparatus for visually monitoring ignition voltages
GB2116329A (en) * 1982-03-10 1983-09-21 Daimler Benz Ag Apparatus for recognising misfiring in an external ingition internal combustion machine
GB2172115A (en) * 1985-03-07 1986-09-10 Fki Crypton Limited Ignition analysers
EP0307503A1 (fr) * 1986-03-10 1989-03-22 Cross-Check Technology, Inc. Structure quadrillée de test, par recoupement, pour le test de circuits intégrés
US4758791A (en) * 1986-11-28 1988-07-19 United Technologies Corporation Universal secondary high voltage sensor
US4724702A (en) * 1986-12-08 1988-02-16 General Motors Corporation LPP sensor interface circuit
US4847563A (en) * 1988-07-12 1989-07-11 Snap-On Tools Corporation Distributorless ignition interface
DE3841739A1 (de) * 1988-12-10 1990-06-13 Bosch Gmbh Robert Vorrichtung zum erfassen von zuendsignalen

Also Published As

Publication number Publication date
DE59109095D1 (de) 1999-03-18
ES2129024T3 (es) 1999-06-01
DE4103310A1 (de) 1992-08-06
EP0498046B1 (fr) 1999-02-03
EP0498046A3 (en) 1993-02-10

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