EP1995452A1 - Circuit d'ignition pour des moteur à combustion interne à allumage commandé - Google Patents

Circuit d'ignition pour des moteur à combustion interne à allumage commandé Download PDF

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Publication number
EP1995452A1
EP1995452A1 EP07108564A EP07108564A EP1995452A1 EP 1995452 A1 EP1995452 A1 EP 1995452A1 EP 07108564 A EP07108564 A EP 07108564A EP 07108564 A EP07108564 A EP 07108564A EP 1995452 A1 EP1995452 A1 EP 1995452A1
Authority
EP
European Patent Office
Prior art keywords
spark
ignition
diodes
electric component
ignition circuit
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.)
Withdrawn
Application number
EP07108564A
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German (de)
English (en)
Inventor
Jonathan Redecen-Dibble
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.)
Arora GmbH
Original Assignee
Arora 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 Arora GmbH filed Critical Arora GmbH
Priority to EP07108564A priority Critical patent/EP1995452A1/fr
Publication of EP1995452A1 publication Critical patent/EP1995452A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • F02P9/00—Electric spark ignition control, not otherwise provided for
    • F02P9/002—Control of spark intensity, intensifying, lengthening, suppression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2400/00—Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
    • F02D2400/11—After-sales modification devices designed to be used to modify an engine afterwards
    • 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

Definitions

  • the present invention relates to ignition circuits for spark ignition internal combustions engines, to electric components for such ignition circuits, and spark ignition internal combustions engines comprising such ignition circuits, according to the preamble of the independent claims.
  • WO 94/17302 describes an electrical circuit for connection between the high voltage source of an ignition system, namely the secondary coil of the ignition coil system, and the spark plug.
  • Such an electrical circuit primarily comprises a capacitor, having a voltage dependant capacitance between 300 to 1000 pF, which may be connected in parallel with a resistor.
  • the capacitor may be connected in series with a diode, or a diode and another resistor in parallel.
  • the purpose of the disclosed electrical circuit is to change the current waveform of the spark, by improving or even repeating the bright line part of a spark event.
  • the bright line part constitutes the short period following the ionisation of the gas in the gap of the spark plug, equivalent with the ignition of the spark.
  • the flaring part, following the bright line part of the spark event is reduced in length.
  • the optional diode has only the purpose to avoid repetitive re-ionisation with changing polarity, which may else disturb some control systems of the engine. Since meanwhile it was found that the flare part of the spark is important for the combustion process, the shown ignition circuit is actually counterproductive.
  • GB 2330878 discloses an ignition circuit with a single diode connected between the high voltage source and the spark plug.
  • the purpose of the shown ignition circuit is to extend the effective length of the flare part of the spark, which is believed being important for the combustion process. Moulding it in a suitable dielectric material additionally insulates the diode. Nevertheless the reverse breakdown voltage of the diode is limited, and thus also the maximum reverse voltage.
  • the achievable voltage over the electrode gap during the flare part of the diode is between 1 and 2 kV.
  • An ignition circuit according to the invention contains an electric component between the high voltage source and the spark plug.
  • Said electric component comprises two high voltage, ultra fast, soft recovery diodes with inherent junction capacitance, which are connected in series.
  • the diodes are moulded in an additional dielectric insulation material.
  • the achievable reverse bias voltage with such electric components according to the inventions can be well above 100 kV.
  • the ignition circuit according to the invention will convert the positive / alternating current after the end of the initial flare part of the spark to an extended flare part, by suppressing the oscillations, and using the charged junction capacitors of the diodes to reignite the flare part, thus producing a strong and sustained negative current secondary discharge. Since the achievable reverse bias voltage and capacitance are higher than known from the prior art, the achievable voltage during the extended flare part can be 4 to 30 kV instead of the known 1 to 2 kV. The increased energy transfer to the fuel/air mixture resulting from the larger current during the extended flare part leads to much stronger ionisation of the gas mixture. This process is assisted by the electrons being able to move more freely through the air to fuel mixture due to the atomic dissociation of the molecules.
  • the catalytic function of the electrons thus allows the more efficient oxidation of lean fuel/air mixtures than with conventional spark ignition.
  • An additional advantage of the excited atomic oxygen concentration resulting from the extended flare part of the spark is the scrubbing of contaminants in the combustion chamber.
  • the ignition circuit according to the invention can be used both for four stroke and two spark ignition engines, and also for rotary spark ignition engines.
  • An engine according to the invention equipped with such an ignition circuit may be run with leaded or unleaded petrol, having high or low octane ratings, two-stroke fuel, competition fuel, methane, hydrogen, LPG, SNG, Diesel, paraffin grades, kerosene, JP 1-10 jet engine fuels, naphthalene, biomass derived fuel, methanol, ethanol, and any other fuel suitable for spark ignition internal combustion engines.
  • the achievable reduction in fuel consumption of an internal combustion engine equipped with an ignition circuit according to the invention is 50% or more, and therefore in parallel the carbon dioxide reduction is also 50% or more.
  • the amount of emission of pollutants such as carbon monoxide, unburned hydrocarbons/volatile organic compounds, and particulate matter, is drastically reduced, even while an engine is idle on 750 to 1000 rpm.
  • Another advantage of an ignition circuit according to the invention is the reduced degradation of the spark plugs, as a consequence of the reduction of the reverse polarity oscillations.
  • FIG. 1 schematically describes an ignition circuit 1 according to the invention, consisting of a primary circuit 11, which is shown in a very simplified manner, and a secondary, high voltage circuit 12.
  • primary circuits 11 There exist several variants of primary circuits 11. They all have in common that in order to create a spark the primary circuit 11 is opened.
  • the drop in the current through the primary coil 61 induces a magnetic field, which is transformed to a high voltage spike in the secondary coil 62.
  • This high voltage spike then ignites the spark in the spark gap 5.
  • the electric component 3 according to the invention is mounted between the high voltage source in the form of the secondary coil 62, and the spark gap 5.
  • the ignition distributor which is not shown, can be arranged between the electric component 3 and the spark gap 5. Alternatively the ignition distributor may be arranged between the secondary coil 62 and the electric component 3.
  • the electric component 3 In the first variant only one electric component 3 according to the invention is necessary, whereas in the latter case there has be a separate component 3 for each spark plug.
  • the electric component may be a separate unit, or may be integrated into the ignition coil housing or the spark plug housing.
  • a separate unit can be used to modify existing ignition circuits to ignition circuits according to the invention. For equipping new vehicles it is more advantageous to integrate the electric component according to the invention into the housing of the ignition coil device or the spark plug device.
  • FIG. 2(a) schematically shows an embodiment of an electric component 3 according to the invention, and its equivalent circuit diagram.
  • Two diodes 4, 4' are connected in series.
  • the two diodes are high voltage, ultra fast, soft recovery diodes, with an inherent junction capacitance C j of maximum 0.25pF (C j at 50 V DC and 1 kHz). Typically components would rate at between 300 and 1000 pF.
  • Possible diode types which may be used for the purpose are unique to this device. These diode types are specifically designed and are unique in as much as they provide a strong reverse polarity voltage discharge at the spark plug across the electrode of 40 kV to 120 kV unlike all other rectifier diodes, where the current remains positive.
  • FIG. 2(b) shows an equivalent circuit diagram of the electric component of Figure 2(a) , consisting of the two diodes 4, 4', a capacitor 7 representing the combined inherent junction capacitance of the diodes, and a resistor 8 representing the Ohmic resistance.
  • Figure 2(c) shows another possible embodiment of an electric component according to the invention, with three diodes connected in series.
  • the electric component 3 is mounted in such an orientation that the diodes 4, 4' are reversely biased when the high voltage source 62 is positive.
  • the high voltage peak induced by the primary coil 61 is positive, and the electric component 3 has high impedance.
  • the diodes 4, 4' of the electric component 3 according to the invention are now reversely biased, and the junction capacitor 7 gets charged.
  • the damped LC oscillator in the primary circuit induces an oscillation in the secondary circuit, leading to a change in polarity of the applied voltage.
  • the charged capacitor of the diodes then leads to a reignition of the spark, with an negative current flare part.
  • the combined voltage for the two diodes linked in series is 40 kV, with the additional capacity to treble if necessary the power through the components, by concentrating the power through the exit of the device, by holding a strong dielectric in excess of 28 kV/mm 3 , thereby making the device four times more powerful than the known systems.
  • the voltage is higher due to the rectifier diodes' inherent capacitance being higher, up to that of 40 kV, which provides the greater combined voltage.
  • the ultra fast soft recovery speed of the device also concentrates the electrical discharge into a smaller initial discharge length of time, maintaining maximum power through the dwell time.
  • the electric component according to the invention provides a recovery of 50 ns, which is four times faster than the known systems.
  • Figure 3 shows a cross section along the longitudinal axis of a unit 20 comprising an electric component 3 according to the invention, moulded in an insulation body 9.
  • the axial leads 22 are connected to end caps 21 for the attachment of the high-tension leads.
  • the insulation body 9 fully covers the electric component 3 and the axial leads 22.
  • the end caps 21 are arranged in recesses of the insulation body 9, to avoid arcing between these two non-insulated parts.
  • the insulating body 9 preferably consists of an organically filled, glass fibre reinforced polyester moulding compound with high dimensional stability and low flammability.
  • the breakdown voltage of said compound is preferably 28 kV / mm or above.
  • the unit 20 may be enclosed in an additional plastic casing in the form of a lockable hinged tube. This provides electrical resistance from outside influences and acts to prevent damage from water ingression.
  • Figure 4 schematically shows the voltage across the electrode gap of the spark plug, with a prior art ignition circuit (dotted line) and an ignition circuit according to the invention (full line).
  • Tests of the ignition circuit according to the invention were carried out with a number of vehicles, with different types of spark ignition internal combustion engines. During all tests a considerable reduction in fuel consumption and exhaust emission was achieved.
  • Vehicle BMW 318i Saloon, 1999, 50875 miles; Engine: 1900cc four cylinder, fuel injected, catalytic converter; Fuel: Unleaded Petrol 96 RON.
  • a four-gas analysis was carried out whilst in standard trim using a Probike Microgas analyser.
  • the gases tested for were Carbon Monoxide (CO), Carbon Dioxide (CO2), Oxygen (02), and Hydrocarbons (HC).
  • CO Carbon Monoxide
  • CO2 Carbon Dioxide
  • Oxygen 02
  • HC Hydrocarbons
  • the bike completed 251 miles with one tank-full.
  • the ignition circuit according to the invention installed, the engine leaned off, and spark plugs adjusted from 35/1000 inch to 40/1000 inch electrode gap, the bike then travelled on the track for 362 miles with one tank-full.
  • Vehicle Jet Ski, Kawasaki STX R1200; Engine: 3 cylinder 2 stroke engine

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  • 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)
EP07108564A 2007-05-21 2007-05-21 Circuit d'ignition pour des moteur à combustion interne à allumage commandé Withdrawn EP1995452A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07108564A EP1995452A1 (fr) 2007-05-21 2007-05-21 Circuit d'ignition pour des moteur à combustion interne à allumage commandé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07108564A EP1995452A1 (fr) 2007-05-21 2007-05-21 Circuit d'ignition pour des moteur à combustion interne à allumage commandé

Publications (1)

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EP1995452A1 true EP1995452A1 (fr) 2008-11-26

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EP07108564A Withdrawn EP1995452A1 (fr) 2007-05-21 2007-05-21 Circuit d'ignition pour des moteur à combustion interne à allumage commandé

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EP (1) EP1995452A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012024756A1 (fr) * 2010-08-26 2012-03-01 Ikat Do Brasil Comércio, Imp. E Exp. Ltda. Procédé de montage de diode dans un fil d'alimentation d'une bougie d'allumage d'un moteur à combustion interne, connecteur pour fil de bougie suppressif, procédé de fabrication de connecteur pour fil de bougie suppressif, connecteur pour câble de bougie et douille pour connexion de bougie d'allumage pour moteurs à combustion interne
WO2013163706A1 (fr) * 2012-05-04 2013-11-07 Ikat Do Brasil Com., Imp. E Exportação Ltda Bougie d'allumage pour moteurs à combustion interne comprenant une diode

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5044349A (en) * 1987-09-18 1991-09-03 Robert Bosch Gmbh High-voltage switch
US5379745A (en) * 1991-05-31 1995-01-10 Robert Bosch Gmbh Ignition system for internal combustion engines with high-tension switches
WO1995009303A1 (fr) * 1993-09-30 1995-04-06 Dawson Royalties Limited Ameliorations relatives a des systemes d'allumage de moteur
US5771871A (en) * 1995-01-26 1998-06-30 Robert Bosch Gmbh Ignition device for internal combustion engines
GB2330878A (en) * 1997-10-29 1999-05-05 Jonathan Redecen Dibble Ignition circuits for i.c. engines
US6357426B1 (en) * 1998-11-16 2002-03-19 Robert Bosch Gmbh Ignition device for a high-frequency ignition

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5044349A (en) * 1987-09-18 1991-09-03 Robert Bosch Gmbh High-voltage switch
US5379745A (en) * 1991-05-31 1995-01-10 Robert Bosch Gmbh Ignition system for internal combustion engines with high-tension switches
WO1995009303A1 (fr) * 1993-09-30 1995-04-06 Dawson Royalties Limited Ameliorations relatives a des systemes d'allumage de moteur
US5771871A (en) * 1995-01-26 1998-06-30 Robert Bosch Gmbh Ignition device for internal combustion engines
GB2330878A (en) * 1997-10-29 1999-05-05 Jonathan Redecen Dibble Ignition circuits for i.c. engines
US6357426B1 (en) * 1998-11-16 2002-03-19 Robert Bosch Gmbh Ignition device for a high-frequency ignition

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012024756A1 (fr) * 2010-08-26 2012-03-01 Ikat Do Brasil Comércio, Imp. E Exp. Ltda. Procédé de montage de diode dans un fil d'alimentation d'une bougie d'allumage d'un moteur à combustion interne, connecteur pour fil de bougie suppressif, procédé de fabrication de connecteur pour fil de bougie suppressif, connecteur pour câble de bougie et douille pour connexion de bougie d'allumage pour moteurs à combustion interne
WO2013163706A1 (fr) * 2012-05-04 2013-11-07 Ikat Do Brasil Com., Imp. E Exportação Ltda Bougie d'allumage pour moteurs à combustion interne comprenant une diode

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