EP1299640A1 - Inductive ignition device comprising a device for measuring an ionic current - Google Patents
Inductive ignition device comprising a device for measuring an ionic currentInfo
- Publication number
- EP1299640A1 EP1299640A1 EP01931419A EP01931419A EP1299640A1 EP 1299640 A1 EP1299640 A1 EP 1299640A1 EP 01931419 A EP01931419 A EP 01931419A EP 01931419 A EP01931419 A EP 01931419A EP 1299640 A1 EP1299640 A1 EP 1299640A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- diode
- ignition
- ignition device
- spark plug
- resistor
- 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
- F02P3/0407—Opening or closing the primary coil circuit with electronic switching means
- F02P3/0435—Opening or closing the primary coil circuit with electronic switching means with semiconductor devices
-
- 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
- F02P17/12—Testing characteristics of the spark, ignition voltage or current
-
- 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
- F02P17/12—Testing characteristics of the spark, ignition voltage or current
- F02P2017/125—Measuring ionisation of combustion gas, e.g. by using ignition circuits
Definitions
- the invention relates to an inductive ignition device for an internal combustion engine, with an ignition coil having a primary coil and a secondary coil, a diode being provided on the side of the secondary coil, a spark plug which has at least one electrode, and a measuring device for determining an ion current.
- Efu diode In inductive ignition systems of motor vehicles with internal combustion engines, a so-called switch-on spark suppression diode, hereinafter referred to as Efu diode, is often used in the circuit of the secondary coil that supplies the ignition spark, which suppresses a current that may arise in the secondary coil circuit due to the charging current of the primary coil.
- the measurement of the ion current flowing through the spark plug during the combustion process offers a possibility of monitoring the combustion process, for example for the detection of combustion misfires, for knock detection or for controlling the ignition timing.
- One possible way of measuring the ion current is via a measuring device which is connected to the circuit of the secondary winding and which measures the current flowing through the electrodes of the spark plug, especially during the period following the end of the spark. Based on the characteristic of the measured curve, statements can be made about the above-mentioned variables. If, as is increasingly the case due to combustion misfires, a residual charge remains between the spark plug and the Efu diode, this falsifies the measurement.
- the object of the invention is therefore to develop an ignition device of the type mentioned at the outset in such a way that the ion current measurement is protected against interference from residual charges.
- the discharge device preferably contains a high-resistance resistor connected in parallel with the diode. It has been found that by bridging the Efu diode with a high-impedance resistor, the function of the Efu diode and the ignition device is not impaired, while residual charges can flow off in the time available.
- the resistance is formed by an electrically conductive but high-resistance layer applied to the diode.
- the high-resistance resistor (R) is realized by doping on a component that also has the diode (D).
- the diode with the parallel resistor can be arranged, for example, in the ignition coil, in a plug of the spark plug or in one of the high-voltage lines in the secondary coil circuit, which keeps the number of components required small.
- the diode and the resistor connected in parallel can be arranged on the high voltage side or on the low voltage side of the secondary winding.
- FIG. 1 a shows a section of the circuit diagram of an ignition device according to the invention in accordance with a first embodiment
- FIG. 1b shows a section of the circuit diagram of an ignition device according to the invention in accordance with a second embodiment
- FIG. 2 shows a circuit diagram of an ignition device known from the prior art
- FIG. 2 shows a known inductive ignition device 10.
- the ignition device has an ignition coil ZS, a primary coil Li and a contains inductively coupled secondary coil L_ 2 .
- the primary coil l_ ⁇ is connected to a battery with the battery voltage Uzs and is controlled by a motor control unit 12 via a transistor T.
- the circuit containing the primary coil ( _ ⁇ ) is referred to below as the primary coil circuit.
- the ignition device 10 also contains a spark plug ZK, with one electrode of which the secondary coil I_2 is connected via an Efu diode D at its end on the high-voltage side in ignition mode.
- the second electrode of the spark plug ZK is connected to ground M.
- the diode D is switched in such a way that it allows the current to flow from the coil L 2 to the spark plug ZK.
- the other end of the secondary coil L 2 on the low voltage side in the ignition mode is connected to an ion current measuring device 14, which in turn is connected to ground M as an example and supplies the ion current Si as a measured value.
- the circuit containing the secondary coil I_ 2 is referred to as a secondary coil circuit.
- the ignition process takes place as is known: First, the transistor T is switched to continuity by the engine control unit 12, so that a current flow can occur in the primary coil 1_. At the selected ignition point, the transistor T is switched to high impedance by the engine control unit 12, so that the current flow in the primary coil circuit is interrupted. The magnetic field of the primary coil generates an induction current in the secondary coil l_2 via the inductive coupling. The number of turns of the coils are coordinated so that the coil L2 generates a high voltage pulse. The current direction is chosen so that a positive voltage is generated at the high-voltage soap of the ignition coil L 2 .
- an ion current measurement is carried out, which records the current flow occurring during the combustion.
- the ion current measuring device itself generates a voltage in the secondary coil circuit in order to move the ions to the electrodes of the spark plug. This ion current is measured by the ion current measuring device.
- combustion misfire i.e. there is no combustion of the air-fuel mixture in the cylinder, no ions are generated and the measured ion current is zero. In this way, combustion misfires can be determined by measuring the ion current.
- the residual charge remains after the end of the ignition spark, i.e. during the measurement period of the ion current measurement, since it can neither overcome the now high-impedance distance between the electrodes of the spark plug, nor can it flow away via the diode D polarized in the opposite direction. Since the gas pressure in the cylinder drops due to the downward movement of the piston and, as a result, according to the Paschen law, the necessary tension for If the ignition of a gas discharge decreases, spontaneous, uncontrolled gas discharges occur as soon as the voltage generated by the residual charge is sufficient for ignition, and consequently a current flows through the ion current measuring device 14.
- FIG. 3 Such a case example is shown in FIG. 3.
- the upper curve shows the profile of the secondary voltage Us measured between the diode D and the spark plug ZK. It can be clearly seen that after the ignition spark has ended, a residual charge of approximately 3000 V remains, which subsequently breaks down into two spontaneous gas discharges.
- the lower curve shows the corresponding ion current signal in which the current flow due to the gas discharges appears as a peak. Such interference signals falsify the measurement and make it difficult to evaluate the data, especially for the detection of misfires in which the ion current to be expected is zero.
- the ignition device according to the invention also has the components shown in FIG. 1, which are not described again below.
- FIGS. 1a and 1b only the differences of the ignition device according to the invention compared to that shown in FIG. 1 are shown.
- a derivation device 16 is provided in the secondary coil circuit, via which a possibly existing residual charge can flow to ground M.
- the derivation device consists of the assembly of the diode D and a resistor R connected in parallel with it.
- the resistor R is selected so that the function of the diode D and the ignition device as a whole is not impaired.
- a resistance of the order of 10 M ⁇ has proven to be a suitable value.
- the diode D and the resistor R connected in parallel with it can either be arranged, as shown in FIG. 1 a, on the low-voltage side LV of the coil L 2 or, as shown in FIG. 1 b, on the high-voltage side HV of the coil L 2 .
- the ignition device according to the invention works like that described above.
- the bridging of the diode D by the resistor R means that enclosed charge carriers can flow to the mass M via the resistor R, so that a residual charge cannot build up between the diode D and the electrode of the spark plug ZK.
- FIG. 4 shows the secondary voltage signal Us for an ignition spark with a subsequent misfire, analogous to the situation shown in FIG. 3, in an ignition device according to the invention. It can clearly be seen that the residual charge is practically completely reduced shortly after the ignition spark has ended. Therefore, spontaneous gas discharges cannot occur during the subsequent pressure drop, so that there are no disturbances in the ion current signal Si due to residual charge and combustion misfires can be reliably detected via the ion current signal.
- the resistor R ' can be implemented, for example, as a conventional component, for example by a conductive coating or a conductive coating of the diode D. It is also conceivable to implement the resistance by doping on the same semiconductor component as the diode.
- the combination of the diode D with the parallel resistor R can be saved e.g. integrate into the ignition coil, the spark plug connector or one of the high-voltage lines 18 in the secondary coil circuit.
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
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10031553 | 2000-06-28 | ||
DE10031553A DE10031553A1 (en) | 2000-06-28 | 2000-06-28 | Inductive ignition device with ion current measuring device |
PCT/DE2001/001343 WO2002001071A1 (en) | 2000-06-28 | 2001-04-06 | Inductive ignition device comprising a device for measuring an ionic current |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1299640A1 true EP1299640A1 (en) | 2003-04-09 |
EP1299640B1 EP1299640B1 (en) | 2006-04-05 |
Family
ID=7647127
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01931419A Expired - Lifetime EP1299640B1 (en) | 2000-06-28 | 2001-04-06 | Inductive ignition device comprising a device for measuring an ionic current |
Country Status (5)
Country | Link |
---|---|
US (1) | US20030168050A1 (en) |
EP (1) | EP1299640B1 (en) |
JP (1) | JP2004502079A (en) |
DE (2) | DE10031553A1 (en) |
WO (1) | WO2002001071A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9429134B2 (en) | 2013-12-04 | 2016-08-30 | Cummins, Inc. | Dual coil ignition system |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BR202012010571U2 (en) * | 2012-05-04 | 2015-09-15 | Ikat Do Brasil Comércio Imp Ação E Exportação Ltda | spark plug for internal combustion engines incorporating a diode |
DE102014219397A1 (en) * | 2014-09-25 | 2016-03-31 | Robert Bosch Gmbh | Ignition coil with diode and additional suppression element |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3765391A (en) * | 1971-02-22 | 1973-10-16 | W Cook | Transistorized ignition system |
US5365910A (en) * | 1991-05-14 | 1994-11-22 | Ngk Spark Plug Co., Ltd. | Misfire detector for use in internal combustion engine |
DE19605803A1 (en) * | 1996-02-16 | 1997-08-21 | Daug Deutsche Automobilgesells | Circuit arrangement for ion current measurement |
JP3330838B2 (en) * | 1997-02-18 | 2002-09-30 | 三菱電機株式会社 | Device for detecting combustion state of internal combustion engine |
JP3338624B2 (en) * | 1997-02-18 | 2002-10-28 | 三菱電機株式会社 | Device for detecting combustion state of internal combustion engine |
JP3753290B2 (en) * | 1998-12-28 | 2006-03-08 | 三菱電機株式会社 | Combustion state detection device for internal combustion engine |
-
2000
- 2000-06-28 DE DE10031553A patent/DE10031553A1/en not_active Withdrawn
-
2001
- 2001-04-06 JP JP2002506366A patent/JP2004502079A/en active Pending
- 2001-04-06 WO PCT/DE2001/001343 patent/WO2002001071A1/en active IP Right Grant
- 2001-04-06 DE DE50109445T patent/DE50109445D1/en not_active Expired - Fee Related
- 2001-04-06 US US10/311,721 patent/US20030168050A1/en not_active Abandoned
- 2001-04-06 EP EP01931419A patent/EP1299640B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0201071A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9429134B2 (en) | 2013-12-04 | 2016-08-30 | Cummins, Inc. | Dual coil ignition system |
US10006432B2 (en) | 2013-12-04 | 2018-06-26 | Cummins, Inc. | Dual coil ignition system |
Also Published As
Publication number | Publication date |
---|---|
DE10031553A1 (en) | 2002-01-10 |
JP2004502079A (en) | 2004-01-22 |
WO2002001071A1 (en) | 2002-01-03 |
EP1299640B1 (en) | 2006-04-05 |
DE50109445D1 (en) | 2006-05-18 |
US20030168050A1 (en) | 2003-09-11 |
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