EP0496050A2 - Dispositif d'essai d'installation d'allumage - Google Patents

Dispositif d'essai d'installation d'allumage Download PDF

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Publication number
EP0496050A2
EP0496050A2 EP91119498A EP91119498A EP0496050A2 EP 0496050 A2 EP0496050 A2 EP 0496050A2 EP 91119498 A EP91119498 A EP 91119498A EP 91119498 A EP91119498 A EP 91119498A EP 0496050 A2 EP0496050 A2 EP 0496050A2
Authority
EP
European Patent Office
Prior art keywords
signal
ignition
switching means
point
decoupling
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
EP91119498A
Other languages
German (de)
English (en)
Other versions
EP0496050A3 (fr
EP0496050B1 (fr
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 EP0496050A2 publication Critical patent/EP0496050A2/fr
Publication of EP0496050A3 publication Critical patent/EP0496050A3/xx
Application granted granted Critical
Publication of EP0496050B1 publication Critical patent/EP0496050B1/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 testing an ignition system according to the preamble of the main claim.
  • a device for detecting ignition signals is known, which is particularly suitable for multi-coil ignition systems.
  • second decoupling means of opposite passage directions are provided, which can also be connected to the switching connections.
  • the decoupling means are implemented as diode groups.
  • the first group of diodes brings together those signals at the ignition coils that occur during the opening phase of ignition switching elements.
  • the second group of diodes combines the signals that are present during the closing phase of the elements.
  • the circuit arrangement shown contains a load resistor for the first diode group.
  • a load resistance required for the second group of diodes is not shown in the known circuit arrangement, since there the focus is on the principle of operation of the signal combination. If the first group of diodes has a load resistor connected to ground has, it is easily possible to provide the second diode group with a load resistor connected to the supply voltage. However, such a circuit would not provide a reliable measurement result in all operating cases.
  • the invention has for its object to develop the device known from DE-OS 38 41 739.
  • a series circuit comprising a load resistor is provided for second decoupling means and switching means which are actuated as a function of the signal level occurring at the first decoupling means ensures that there is a correct input signal at the input of a signal processing arrangement in all operating states. Incorrect measurements and misinterpretations due to apparent measurement results are thereby reliably prevented.
  • the test device according to the invention is suitable for diagnosing ignition systems with more than one ignition coil.
  • the high-voltage distribution can be carried out without a distributor or with at least one distributor.
  • first comparison means are provided which compare the signal level occurring at the decoupling means with a first threshold and actuate the switching means when the threshold is exceeded. With the same switching signal, further switching means can be actuated, which switch between the decoupling means.
  • second comparison means are provided in the signal processing arrangement, which compare the signal level occurring at the input of the signal processing arrangement with a second threshold and actuate the switching means when the threshold is exceeded.
  • first comparison means according to the first embodiment are preferably implemented as a fast-working discrete circuit arrangement that can simultaneously switch the other switching means with sufficient speed
  • second comparison means according to the other embodiment are preferably implemented in a microcomputer circuit, which has the advantage that a further Delay provided according to the invention when the switching means are switched off can be implemented in the software of the microprocessor arrangement without further effort.
  • a further embodiment provides that the load resistance for the second decoupling means can be connected via third decoupling means to a power supply connection of the ignition coils and / or the power supply of the device according to the invention and / or to a battery which is provided for supplying power to the ignition system.
  • FIG. 10 a block diagram of an ignition system 10 is shown, which contains two ignition coils 11, 12.
  • First primary connections 13, 14 of the ignition coils 11, 12 are connected - possibly via an ignition switch (not shown) - to a first connection 15 of an energy source 16, the second connection 17 of which is connected to a ground 18.
  • Second primary connections 19, 20 of the ignition coils 11, 12 are connected to an ignition switching device 21, which contains ignition switching elements, which are not identified in more detail, and which switch the second primary connections 19, 20 to ground 18.
  • a first and second secondary connection 22, 23 of the ignition coil 11 each lead to spark plugs 24, 25 which are connected to ground 18.
  • a first secondary connection of the ignition coil 12 is connected to the second primary connection 20, while a second secondary connection 27 is connected to a further spark plug 28, which is also connected to ground 18.
  • the test device 30 according to the invention for testing the ignition system 10 is drawn in dashed lines separated from the ignition system 10.
  • a first and second input 31, 32 of the test device 30 can be connected via connection points 33, 34 to the second primary connections 19, 20 of the ignition coils 11, 12, respectively.
  • the two inputs 31, 32 are each provided with first and second decoupling means 35, 36; 37, 38 connected.
  • the first decoupling means 35, 36 lead to a first signal combining point 39, while the second decoupling means 37, 38 lead to a second signal combining point 40.
  • the two signal merging points 39, 40 are with Switching means 41 connected, select between the two points 39, 40.
  • a switching means connection leads as an input signal 42 to a signal processing arrangement 43 which is surrounded by dashed lines.
  • the input signal 42 first arrives in an input arrangement 44 which contains a voltage divider 45 connected to ground 18.
  • First comparison means 47 are connected to an output 46 of the input arrangement 44 and emit a signal to a first signal delay arrangement 48, which in turn actuates switching means 49 which are connected to the second signal combining point 40 via a load resistor 50.
  • Second comparison means 51 are connected to the first signal junction point 39, to which an input signal is also fed, which is tapped from the first connection 15 of the energy source 16.
  • An output 52 of the second comparison means 51 actuates the switching means 41 and simultaneously outputs a signal to a second signal delay arrangement 53 which actuates the switching means 49.
  • the switching means 49 are connected to further circuit points via third decoupling means 54, 55, 56.
  • the decoupling means 55 is connected to the first connection 15 of the energy source 16.
  • the decoupling means 54 leads to a power supply 57, not described in more detail, of the test device 30 according to the invention.
  • the decoupling means 55 leads to the first primary connections 13, 14 of the ignition coils 11, 12, provided that these primary connections from the first connection 15 of the energy source 16 are not shown in the figure Ignition switches are separable.
  • the test device according to the invention works as follows:
  • the test device 30 according to the invention enables the detection of signal profiles that occur in the ignition system 10 on the primary side of the ignition coils 11, 12. Instead of complete signal profiles, trigger signals can also be derived from the ignition system 10.
  • the ignition system 10 works with a stationary high-voltage distribution.
  • the term "static high-voltage distribution" designates ignition systems 10 which no longer have conventional distributors.
  • the ignition system 10 therefore contains more than one ignition coil 10, 11 in order to be able to ignite a plurality of spark plugs 24, 25, 28 of multi-cylinder engines in a chronologically offset sequence. In the example, two ignition coils 11, 12 are shown. However, further ignition coils can easily be provided.
  • the ignition coils 11, 12 are, for example, conventional coils which are used in battery or transistor ignition systems. But it can also be coils that are used in thyristor or high-frequency ignition systems, which are referred to as high-voltage transformers.
  • test device 30 according to the invention is equally suitable for diagnosing ignition systems with more than one ignition coil and with at least one distributor.
  • the test device 30 has a number of inputs 31, 32 corresponding to the ignition coils 11, 12, which can be connected to the second connections 19, 20 of the ignition coils 11, 12 via the connection points 33, 34, respectively.
  • the second primary connections 19, 20 are connected to ignition switching elements, which are accommodated in the ignition switching device 21. These ignition switching elements, not shown in detail, temporarily connect the second primary connections 19, 20 to ground 18, for example. After opening the ignition switching elements, a high-voltage signal is produced on the secondary side of the ignition coils 11, 12, which leads to the ignition of the spark plugs 24, 25, 28.
  • Other components that are required for the generation of high-voltage pulses, such as for example, capacitors on the primary side are not shown in the figure because they have no significance for the basic function of the test device according to the invention.
  • the inputs 31, 32 lead to the two decoupling means 35, 36; 37, 38.
  • the decoupling means are components which have a preferred direction for the electric current.
  • diodes or transistors connected as diodes are suitable.
  • the first diodes 35, 36 combine a signal at the inputs 31, 32, which has a positive potential compared to the potential at the first point 39 in the diode polarity shown in the figure.
  • a special load resistance for the first diodes 35, 36 is not provided in the circuit arrangement.
  • a load resistance is provided, for example, by an input circuit, which is arranged in the second comparison means 51, or by the input arrangement 44 of the signal processing arrangement 43, which each produce a current path, preferably against ground 18.
  • the second diodes 37, 38 combine the signals at the inputs 31, 32 which have a negative potential with respect to the point 40.
  • the second diodes 37, 38 are connected to a positive potential with respect to ground 18 via the load resistor 50 and the switching means 49.
  • the positive potential is, for example, the potential to be tapped at the first connection 15 of the energy source 16 of the ignition system 10 and / or the potential taken from the power supply 27 of the test device 30 and / or a potential which can be tapped at the first primary connections 13, 14 of the ignition coils 11, 12. This connection is not shown in the figure. It can be provided in particular if between the first primary connections 13, 14 and the first connection 15 of the energy source 16 an ignition switch, not shown in the figure, is provided.
  • the third decoupling means 54, 55, 56 are provided, which are preferably implemented as diodes or as transistors, which are connected as diodes.
  • signals from the second primary connections 19, 20 of the ignition coils 11, 12 are combined, which occur in particular during the opening phase of the ignition switching elements. It is in this phase that the ignition process, the spark duration, and generally the opening time of the ignition switching elements. In particular, the signals that occur during the closing time of the ignition switching elements are combined at the second signal combining point 40. During this time, the second primary connections 19, 20 of the ignition coils 11, 12 are connected to ground 18 via the ignition switching elements, so that a primary current can be built up on the primary sides 11, 12 in this phase.
  • the switching means 41 enable the selection of one of the two signal combining points 39, 40 which are connected to the signal processing arrangement 43.
  • the switching means 41 are preferably implemented as an electronic switch. The switchover could in principle be done manually. The diagnosis would then be based on the longer observation of the signals located at the first point 39 and after switching over, the signals located at the point 40.
  • the changeover switch 41 is preferably actuated by the second comparison means 51, which compare the potential at the first point 39 with a threshold value, which in the following with reference to a first threshold value in the first comparison means 47 is referred to as the second threshold.
  • the second threshold value is, for example, at least at the potential at which the connection 15 of the energy source 16 lies.
  • the second threshold value is preferably set to a higher value, in which additional forward voltages of semiconductor components and of protective circuits, which are not detailed, are taken into account.
  • the second threshold is set to approximately 20 V, for example. If the potential at the first point 39 exceeds the second threshold, the second comparison means 51 actuate the changeover switch 41 in such a way that it connects the first point 39 to the input 42 of the signal processing arrangement 43. If the potential at the first point 39 is below, the changeover switch 41 is placed at the second point 40.
  • the output 52 of the second comparison means 51 also leads to the signal delay arrangement 53, which actuates the switching means 49.
  • the switching means 49 are preferably an electronic switch, which is implemented, for example, as a transistor.
  • the signal occurring at the output 52 which actuates the changeover switch 41 can also be used to actuate the switch 49.
  • second switch 49 is closed.
  • the second signal delay arrangement 53 ensures that the switch 49 remains closed for a predeterminable time. The time is set, for example, such that switch 49 remains closed when testing ignition system 10 of a very slow-running single-cylinder engine.
  • the load resistance of the second diodes 37, 38 with positive potential can be connected to the switch 49 as a function of the signal level occurring at the first diodes 35, 36. This measure proves to be particularly useful in certain operating states. If the working resistance 50 was permanently connected to a positive potential, for example with open inputs 31, 32 the positive signal potential would always be present at the second signal combining point 40. An apparent signal or an apparent measured value, which corresponds approximately to the positive potential at the load resistor 50, could be present at the subsequent signal-processing arrangement 43, at the input 42 of which further measuring devices not described in the present description can be connected.
  • the second comparison means 51 merely switch the changeover switch 41.
  • the switch 49 is actuated by the signal processing arrangement 43.
  • the arrangement 43 contains the first comparison means 41, which compare the potential at the voltage divider 45 with a first threshold.
  • the first threshold could be set according to the same criteria as the second threshold.
  • the first threshold should also be set such that it is ensured that the switch 49 is only closed when a sufficiently high potential occurs at the first signal merging point 39.
  • the first comparison means 47 are connected in the figure to the output 46 of the voltage divider 45. It is also possible to provide the first comparison means 47 directly at the input 42.
  • the first threshold is preferably also set to a potential that lies above the potential at the first connection 15 of the energy source 16.
  • the threshold can be, for example, between 20 V and 12 V for a power supply approx. 100 V. Such high voltage values are no longer present in the signal processing arrangement 43 because the voltage divider 45, if provided, brings about a reduction. Furthermore, the signal processing arrangement 43, with the exception of the voltage divider 45, is preferably implemented in a microprocessor system which works with numbers instead of absolute voltages. The first threshold can therefore be set to an internal value that relates to the input 42.
  • the output of the first comparison means 47 actuates the switch 49 via the first signal delay arrangement 48.
  • the second signal delay arrangement 48 is provided, which has the same task as that in the first example.
  • the second comparison means 51 are furthermore preferably provided, which allow the first switch 41 to be switched over quickly.

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)
  • Measurement Of Current Or Voltage (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
EP91119498A 1991-01-21 1991-11-15 Dispositif d'essai d'installation d'allumage Expired - Lifetime EP0496050B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4101574A DE4101574A1 (de) 1991-01-21 1991-01-21 Vorrichtung zum pruefen einer zuendanlage
DE4101574 1991-01-21

Publications (3)

Publication Number Publication Date
EP0496050A2 true EP0496050A2 (fr) 1992-07-29
EP0496050A3 EP0496050A3 (fr) 1994-02-16
EP0496050B1 EP0496050B1 (fr) 1996-04-24

Family

ID=6423364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119498A Expired - Lifetime EP0496050B1 (fr) 1991-01-21 1991-11-15 Dispositif d'essai d'installation d'allumage

Country Status (4)

Country Link
EP (1) EP0496050B1 (fr)
AT (1) ATE137305T1 (fr)
DE (2) DE4101574A1 (fr)
ES (1) ES2086456T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105351136A (zh) * 2015-11-25 2016-02-24 昆山凯迪汽车电器有限公司 点火线圈场强感应式探测系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2064137A (en) * 1979-11-27 1981-06-10 Ti Crypton Ltd Engine analyser
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2064137A (en) * 1979-11-27 1981-06-10 Ti Crypton Ltd Engine analyser
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105351136A (zh) * 2015-11-25 2016-02-24 昆山凯迪汽车电器有限公司 点火线圈场强感应式探测系统

Also Published As

Publication number Publication date
DE4101574A1 (de) 1992-07-23
ATE137305T1 (de) 1996-05-15
DE59107728D1 (de) 1996-05-30
EP0496050A3 (fr) 1994-02-16
ES2086456T3 (es) 1996-07-01
EP0496050B1 (fr) 1996-04-24

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