EP0496050B1 - Dispositif d'essai d'installation d'allumage - Google Patents
Dispositif d'essai d'installation d'allumage Download PDFInfo
- Publication number
- EP0496050B1 EP0496050B1 EP91119498A EP91119498A EP0496050B1 EP 0496050 B1 EP0496050 B1 EP 0496050B1 EP 91119498 A EP91119498 A EP 91119498A EP 91119498 A EP91119498 A EP 91119498A EP 0496050 B1 EP0496050 B1 EP 0496050B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- ignition
- switching means
- point
- arrangement
- 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
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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 the principle of operation of the signal summarization is in the foreground. 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 which 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. Second 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. First primary connections 19, 20 of the ignition coils 11, 12 are connected to an ignition switching device 21, which contains ignition switching elements (not designated in more detail) which switch the first 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 shown in broken lines separated from the ignition system 10.
- a first and a 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, which select between 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 reaches 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, which is not described in more detail, of the test device 30 according to the invention.
- the decoupling means 55 leads to the second 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.
- test device works as follows:
- the test device 30 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” denotes ignition systems 10 that 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.
- the first 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 first 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 with respect 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 second 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 second 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 first 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.
- the ignition process, the spark burning duration, and generally the opening time of the ignition switching elements lie in this phase.
- the signals that occur during the closing time of the ignition switching elements are combined at the second signal combining point 40.
- the first 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 changeover 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 constantly connected to a positive potential, for example with open inputs 31, 32, positive potential would always be present at the second signal merging 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 combining 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. Apart from the voltage divider 45, the signal processing arrangement 43 is also 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 changeover 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)
Claims (7)
- Dispositif d'essai d'une installation d'allumage comportant plusieurs bobines d'allumage, avec des premiers moyens de découplage (35, 36) à sens de passage prédéterminé, qui peuvent être respectivement reliés aux premières bornes de primaire (19, 20) des bobines d'allumage (11, 12) et qui réunissent les signaux à un premier point (39), et des seconds moyens de découplage (37-38) à sens de passage opposé, qui peuvent être reliés respectivement aux premières bornes de primaire (19, 20) et réunissent les signaux en un second point (40), et des moyens de commutation reliant un circuit de traitement de signal (43) au premier point de réunion de signaux (39) ou au second point de réunion de signaux (40), caractérisé par un montage en série formé d'une résistance de travail (50) pour les seconds moyens de découplage (37, 38) et les seconds moyens de commutation (49), ces derniers étant actionnés en fonction du potentiel apparaissant sur le premier moyen de réunion de signaux (39).
- Dispositif selon la revendication 1, caractérisé en ce que les premiers moyens de comparaison (47) du premier circuit de traitement de signal (43) comparent un signal d'entrée (42) du circuit (43) à un premier seuil, et actionnent les seconds moyens de commutation (49) en fonction du résultat de la comparaison.
- Dispositif selon la revendication 1 ou 2, caractérisé par des seconds moyens de comparaison (51) qui comparent le potentiel du premier point de réunion de signaux (39) à un second seuil, et actionnent les seconds moyens de commutation (49) en fonction du résultat de la comparaison.
- Dispositif selon l'une des revendications précédentes, caractérisé en ce que le signal de sortie (52) des seconds moyens de comparaison (51) actionne les premiers moyens de commutation (41) en fonction du résultat de la comparaison.
- Dispositif selon l'une des revendications précédentes, caractérisé en ce que le signal qui actionne les seconds moyens de commutation (49) passe par un circuit de temporisation (48, 53) assurant une coupure retardée des seconds moyens de commutation (49).
- Dispositif selon l'une des revendications précédentes, caractérisé en ce que la résistance de travail (50) est reliée par des troisièmes moyens de découplage (54, 55, 56) à une alimentation en courant (57) du dispositif de contrôle (30) et/ou à une première borne (15) d'une source d'énergie (16) de l'installation d'allumage (10) et/ou à des secondes bornes de primaire (13, 14) des bobines d'allumage (11).
- Dispositif selon l'une des revendications précédentes, caractérisé en ce que les moyens de découplage (35, 36 ; 37, 38, 54, 55, 56) sont des diodes.
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 EP0496050A2 (fr) | 1992-07-29 |
EP0496050A3 EP0496050A3 (fr) | 1994-02-16 |
EP0496050B1 true 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) |
Families Citing this family (1)
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 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2064137B (en) * | 1979-11-27 | 1984-05-10 | Ti Crypton Ltd | Engine analysers |
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 |
-
1991
- 1991-01-21 DE DE4101574A patent/DE4101574A1/de not_active Ceased
- 1991-11-15 AT AT91119498T patent/ATE137305T1/de not_active IP Right Cessation
- 1991-11-15 DE DE59107728T patent/DE59107728D1/de not_active Expired - Lifetime
- 1991-11-15 EP EP91119498A patent/EP0496050B1/fr not_active Expired - Lifetime
- 1991-11-15 ES ES91119498T patent/ES2086456T3/es not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2086456T3 (es) | 1996-07-01 |
EP0496050A2 (fr) | 1992-07-29 |
EP0496050A3 (fr) | 1994-02-16 |
DE59107728D1 (de) | 1996-05-30 |
DE4101574A1 (de) | 1992-07-23 |
ATE137305T1 (de) | 1996-05-15 |
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