EP1238195A2 - Steuerbare zündschaltung - Google Patents
Steuerbare zündschaltungInfo
- Publication number
- EP1238195A2 EP1238195A2 EP00984610A EP00984610A EP1238195A2 EP 1238195 A2 EP1238195 A2 EP 1238195A2 EP 00984610 A EP00984610 A EP 00984610A EP 00984610 A EP00984610 A EP 00984610A EP 1238195 A2 EP1238195 A2 EP 1238195A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- ignition
- circuit
- coil
- voltage
- pulse
- 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
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
- F02P3/00—Other installations
- F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
- F02P3/04—Layout of circuits
- F02P3/05—Layout of circuits for control of the magnitude of the current in the ignition coil
- F02P3/051—Opening or closing the primary coil circuit with semiconductor devices
Definitions
- the invention relates to an ignition circuit according to the preamble of claim 1.
- an electronic switch is connected in parallel with the capacitor and is controlled by a single pulse from the pulse generator.
- the electronic switch When the electronic switch is switched on, there is a short circuit in the capacitor and thereby a rapid breakdown of the voltage across the capacitor, as a result of which there is a rapid increase in the current flow through the primary winding of the ignition coil designed as an economy transformer.
- This causes a single ignition voltage pulse on the secondary side of the ignition coil, which should be sufficient to ignite a spark between the two electrodes of a spark plug.
- the breakdown voltage of the distance between the two electrodes of a spark plug increases with the pressure to which the gas mixture located between the electrodes is exposed. This results in high-compression spark-ignition internal combustion engines, e.g. with gas engines, significant problems. With such engines, misfiring occurs again and again unless extremely high ignition voltages are applied to the spark plugs. At such high ignition voltages, however, a correspondingly high energy is also stored in the ignition coil, which for the most part flows over the spark after each ignition of the spark gap of the spark plug.
- the after the interruption flows electronic switch the stored energy in the capacitor. The next time the switch is turned on, this process is repeated, but there is practically no rise in the ignition voltage. If the ignition voltage is just due to the spark for igniting the given condition of the electrodes of the spark plug and the pressures provided in the combustion chamber of the internal combustion engine, irregular fluctuations occur due to the fluctuations in the pressure and the supply voltage, and thus an uneven run the internal combustion engine and thus to a significant loss in performance of the same.
- EP 0 070 572 discloses an ignition system in which the primary winding of the transformer is part of an LC resonant circuit, which in turn is connected in series with a transistor acting as a chopper or switch and a resistor.
- the transistor is driven with pulse trains with individual pulses modulated in their duration, so that the spark plugs are fed with ignition pulse trains with individual ignition pulses with modulated energy.
- an ignition spark does not develop, a considerable amount of the energy stored on the secondary side of the transformer is lost for a subsequent ignition.
- the intended chopper is not suitable for the formation of firing sequences as are necessary for the formation of a plasma as described below.
- WO 98/19066 describes an ignition system in which the primary coil of a transformer is part of an oscillating circuit in which a capacitor and a discharge switch are arranged.
- the resonant circuit is excited in an externally controlled manner.
- the first ignition takes place by discharging a capacitor after closing a discharge switch.
- By excitation of the resonant circuit during the "jerking”, enough energy is introduced to maintain the ignition spark for an arbitrarily long time.
- the ignition frequency is thus tied to the natural frequency of the resonant circuit and can therefore hardly be varied, in particular a circuit is not required in this embodiment suitable to generate successive ignition pulses very quickly.
- the primary winding of an ignition coil is used on the one hand to transform the ignition energy stored in a storage capacitor to the high value required for the ignition, but on the other hand also to transform the DC voltage supplied by a battery to the ignition energy to be stored in the capacitor , This is also realized by using switching transistors, however, of phase-shifted pulse trains with a constant duty cycle.
- the aim of this invention is to replace the voltage converter, which has the task of converting the DC voltage originating from the on-board electrical system battery into the substantially higher DC charging voltage, so as to make the ignition system more compact and with a smaller number of components.
- the proposed circuit is not suitable for using the energy stored on the secondary side of the transformer for a subsequent ignition if the formation of an ignition spark should not take place.
- the aim of the invention is to avoid these disadvantages and to propose an ignition circuit of the type mentioned at the outset which ensures reliable ignition even in the case of high-compression internal combustion engines and in which there is only a low current load on the electrodes of the spark plugs.
- the circuit should be suitable for supplying ignition pulses which bring about ionizations in the fuel mixture, even if no ignition initially occurs, and thus initiate plasma formation before the actual ignition occurs.
- the duty cycle of the firing order should be variable and the energy stored in the transformer should be returned to suitable storage capacitors if the firings have not taken place.
- the proposed measures ensure that several ignition pulses can be generated during the intended ignition duration. This increases the likelihood of a successful ignition.
- the primary winding of the ignition coil is connected in the shunt arm of a bridge circuit consisting of a series connection of two identical electronic switches and a series connection of two capacitors, whereby to a diode is connected antiparallel to each of the electronic switches and a pulse generator applies a plurality of pulses, each phase-shifted by 180 °, to the electronic switches during the intended ignition duration.
- This also has the very significant advantage that, if there is no ignition spark between the electrodes, a large part of the energy in the circuit is stored in the circuit and is also available for the next ignition pulse. This also ensures that an ignition spark is formed during the intended ignition duration even under difficult ignition conditions.
- the capacitors can be charged via the supply voltage of the circuit if there is no sparking between the electrodes of the spark plug supplied by the ignition circuit during the first ignition pulse ,
- This slow palpation of the field strength in the individual pulses leads to the preparation of the ignition spark, since the preliminary spark ("streamer") which forms with the first pulses leads to an increased formation of ions which are not broken down in the short pauses between the voltage pulses can.
- the ignition circuit according to the invention in contrast to the conventional ignition circuits in which only a single ignition pulse is generated during the intended ignition duration, results in a significantly higher level of ignition reliability even under very difficult ignition conditions, such as are the case with externally ignited high-compression engines.
- Another advantage of the ignition circuit according to the invention lies in the fact that the ignition current, with the spark already ignited, between the electrodes of the spark plug can be controlled by changing the frequency and the width of the pulses driving the switches. This makes it possible to protect the electrodes of the spark plug to a very large extent, since a very considerable reduction in the ignition current is possible during the duration of the spark and the wear on the electrodes can be significantly reduced.
- the large number of intermediate sparks generated during the ignition duration also results in a higher burning rate of the gas mixture in a cylinder of an internal combustion engine, which increases its efficiency.
- the number of intermediate sparks increases with increasing frequency of the pulses driving the switches.
- a plasma cloud remains in the area of the electrodes of the spark plug, making it much easier to re-ignite a spark.
- This also enables a large opening angle directed towards the interior of the combustion chamber, e.g. 60 to 90 ° between the electrodes of the spark plug. With a large opening angle of the electrodes, a spark that burns between them is driven towards the interior of the combustion chamber due to the electromagnetic forces caused by the current flow, thereby facilitating ignition of the combustible mixture in the combustion chamber.
- larger electrode spacings can be provided than in conventional ignition circuits, since there is a considerably higher degree of ignition reliability due to the large number of ignition pulses that are generated during the intended ignition duration.
- the proposed circuit also has the advantage that part of the energy stored in the ignition coil after the ignition of a spark between the electrodes of a spark plug into the capacitors flows back, which leads to a rapid decrease in the ignition current and thus the load on the electrodes of the spark plug. This also results in a correspondingly increased service life for the spark plug.
- the features of claim 4 result in the advantage that the ignition spark is driven against the interior due to the electrodes that can be opened against the combustion chamber, and thereby better ignition of the mixture is achieved.
- the features of claim 6 also achieve a reduction in the ignition current after ignition.
- Fig. 1 is a circuit diagram of the circuit according to the invention.
- FIG. 2 shows diagrams of the voltage profiles at different points of the circuit according to FIG. 1.
- the circuit shown has a control part 1, which is essentially designed as a frequency divider, which at its two outputs II, III by 180 ° delivers phase-shifted signal trains. These signal trains result with respect to ground or a further connection 2, which is connected to a pole of the primary winding L1 of an ignition coil 3.
- This pole of the primary winding L1 is also connected to a center connection of a series circuit formed from two electronic switches T1, T2, the control electrodes of which are connected to the outputs II and III of the control part 1.
- This series connection of the two electronic switches T1, T2 is connected to ground GND and to a voltage source U, which preferably supplies a controllable voltage of 12 to 300 V DC.
- a diode D1, D2 is connected antiparallel to each electronic switch T1, T2, preferably very rapidly switching diodes are provided.
- a series connection of two capacitors C2, C3 is also connected in parallel with the series connection of the two electronic switches T1, T2, to the center connection of which the second pole of the primary winding L1 of the ignition coil 3, which is designed as a full transformer and is preferably provided with a ferrite core, is connected.
- a storage capacitor C1 is provided, which is also connected to the voltage source U.
- One pole of the secondary coil L2 of the ignition coil 3 is connected to ground via a resistor R1 and the second pole is connected to an electrode of a spark plug 4, the second electrode of which is connected to ground.
- a sensor 6 for detecting the ignition current is provided, which is connected to a control circuit 5 connected is.
- This is supplied with a signal train VIII (Fig. 2), which enables the delivery of control pulses I to the control part 1 at a certain point in time and for a certain period of time.
- the control circuit 5 is loaded with a signal train IX. Within the time period for the delivery of control pulses I, this defines a time period after which the setpoint value for the ignition current is reduced.
- a pulse train is applied to input I of control part 1 during a predetermined ignition duration, the pulse duty factor of which, as can be seen from FIG. 2, decreases over the ignition duration. It can also be provided to change the frequency of this pulse train over the ignition duration, in particular to reduce it over the ignition duration.
- the pulse train I causes the pulse trains II, III (FIG. 2) at the outputs II, III of the control part 1, which are phase-shifted from each other by 180 ° and whose pulse duration and frequency depends on the pulse train I.
- pulse trains II, III effect a corresponding switching of the electronic switches T1, T2. If the switch T1 is switched through, there is a current flow via the primary coil L1 from point IV in the direction of point V of the ignition coil 3 and the capacitor C2 is discharged and the capacitor C3 is charged to the voltage of the voltage source U.
- the voltage induced in the secondary coil L2 of the ignition coil 3 does not have to be sufficient to ignite a spark between the electrodes of the spark plug 4, as shown in diagram VI, which shows the ignition current through the spark plug 4.
- the capacitors are recharged during the entire intended ignition duration and thus, due to the associated current flows via the primary coil L1 of the ignition coil 3, to induce voltage peaks with alternating Polarity.
- the ignition current that is formed can be rapidly reduced, thereby protecting the spark plug 4 and ensuring a long service life.
- the detection of the ignition current by the sensor 6 is used, the signal of which influences the pulse trains II, III output by the control circuit 5, the pulse width of the signal trains II, III being reduced in the event of an excessively high ignition current in order to reduce the ignition current.
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)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT00984610T ATE291695T1 (de) | 1999-12-17 | 2000-12-18 | Steuerbare zündschaltung |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT213499 | 1999-12-17 | ||
AT213499 | 1999-12-17 | ||
AT2122000 | 2000-02-11 | ||
AT2122000 | 2000-02-11 | ||
PCT/AT2000/000346 WO2001044655A2 (de) | 1999-12-17 | 2000-12-18 | Steuerbare zündschaltung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1238195A2 true EP1238195A2 (de) | 2002-09-11 |
EP1238195B1 EP1238195B1 (de) | 2005-03-23 |
Family
ID=25597775
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00984610A Expired - Lifetime EP1238195B1 (de) | 1999-12-17 | 2000-12-18 | Steuerbare zündschaltung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1238195B1 (de) |
AU (1) | AU2126201A (de) |
DE (1) | DE50009885D1 (de) |
WO (1) | WO2001044655A2 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110369855B (zh) * | 2019-08-19 | 2024-06-04 | 无锡前元自动化科技有限公司 | 一种高周波火花保护器 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1263248A (en) * | 1968-06-10 | 1972-02-09 | Rotax Ltd | Ignition systems |
FR2510199A1 (fr) | 1981-07-22 | 1983-01-28 | Siemens Sa | Systeme d'allumage pour des moteurs a combustion interne |
US4493306A (en) * | 1982-12-20 | 1985-01-15 | Ford Motor Company | Enhanced spark energy distributorless ignition system (B) |
DE4009145A1 (de) | 1990-03-21 | 1991-09-26 | Bayerische Motoren Werke Ag | Kondensatorzuendanlage fuer brennkraftmaschinen |
FR2665999B1 (fr) * | 1990-08-14 | 1994-01-28 | General Electric Cgr Sa | Dispositif d'obtention d'une tension continue reglable. |
FR2717015B1 (fr) * | 1994-03-03 | 1996-04-26 | Alcatel Converters | Alimentation à découpage adaptée pour permettre des commutations sous tension réduite. |
DE19643785C2 (de) | 1996-10-29 | 1999-04-22 | Ficht Gmbh & Co Kg | Elektrische Zündvorrichtung, insbesondere für Brennkraftmaschinen, und Verfahren zum Betreiben einer Zündvorrichtung |
JP3673075B2 (ja) | 1998-03-09 | 2005-07-20 | 新電元工業株式会社 | スイッチング電源装置 |
-
2000
- 2000-12-18 EP EP00984610A patent/EP1238195B1/de not_active Expired - Lifetime
- 2000-12-18 WO PCT/AT2000/000346 patent/WO2001044655A2/de active IP Right Grant
- 2000-12-18 AU AU21262/01A patent/AU2126201A/en not_active Abandoned
- 2000-12-18 DE DE50009885T patent/DE50009885D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0144655A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001044655A2 (de) | 2001-06-21 |
DE50009885D1 (de) | 2005-04-28 |
WO2001044655A3 (de) | 2002-03-21 |
EP1238195B1 (de) | 2005-03-23 |
AU2126201A (en) | 2001-06-25 |
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