WO2018216263A1 - Dispositif d'allumage et procédé de commande pour celui-ci - Google Patents

Dispositif d'allumage et procédé de commande pour celui-ci Download PDF

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Publication number
WO2018216263A1
WO2018216263A1 PCT/JP2018/002622 JP2018002622W WO2018216263A1 WO 2018216263 A1 WO2018216263 A1 WO 2018216263A1 JP 2018002622 W JP2018002622 W JP 2018002622W WO 2018216263 A1 WO2018216263 A1 WO 2018216263A1
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Prior art keywords
power
converter
ignition
cylinder
voltage
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PCT/JP2018/002622
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English (en)
Japanese (ja)
Inventor
中川　光
亮祐 小林
村上　哲
裕一 村本
棚谷　公彦
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三菱電機株式会社
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Priority to JP2019519458A priority Critical patent/JP6714949B2/ja
Publication of WO2018216263A1 publication Critical patent/WO2018216263A1/fr

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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
    • F02P3/00—Other installations
    • F02P3/01—Electric spark ignition installations without subsequent energy storage, i.e. energy supplied by an electrical oscillator

Definitions

  • the present invention relates to an ignition device for igniting an internal combustion engine and a control method for the ignition device.
  • lean combustion method that burns lean fuel
  • exhaust gas recirculation method that recirculates exhaust gas after fuel combustion into the combustion chamber
  • combustion chamber with high compression ratio There is a method.
  • each method has a problem that it is difficult to ignite fuel steadily, and improvement in ignitability is required.
  • an ignition device using corona discharge disclosed in Patent Document 1.
  • This is configured to form more stable flame nuclei by igniting in a wide variety of points using corona discharge, thereby improving the ignitability of the fuel gas.
  • the reliability of the device is ensured by suppressing element destruction due to current flowing into the device side that supplies ignition energy at the time of ignition.
  • a switch means for stopping the energy supply to the spark plug when an abnormality occurs and a power relay linked to the switch means are known. Yes.
  • the ignition device disclosed in Patent Literature 1 includes an energy supply unit that supplies energy of a certain voltage and a drive circuit, and the drive circuit outputs AC power to the ignition plug side.
  • the higher the output voltage of the energy supply unit the lower the step-up ratio after the drive circuit and the lower the supply current, so that more efficient operation is possible.
  • a high voltage is always applied to the semiconductor element included in the drive circuit.
  • SEB single event burnout
  • the present invention has been made to solve such a problem, and suppresses a state in which a high voltage is applied to a semiconductor element in a drive circuit, and the occurrence rate of SEB without using a high breakdown voltage element. It is an object of the present invention to provide an ignition device that can be reduced in size and configured in a small size.
  • the ignition device of the present invention stores an ignition plug that ignites an internal combustion engine, a DC / AC converter that converts DC power into AC power and outputs the AC power, and energy supplied to the DC / AC converter.
  • a power supply capacitor, a DC / DC converter that converts DC power from a DC power source into a predetermined voltage value and outputs the voltage to the power supply capacitor, and the power supply capacitor to the DC / AC converter A first power cut-off device that conducts and cuts off a first electric circuit that supplies direct-current power; and a control device that controls the first power cut-off device, wherein the DC / AC converter is the spark plug
  • the first power cut-off device is controlled so as to have a period during which the first electric circuit is cut off during a period when no AC power is output.
  • the ignition device can be downsized.
  • FIG. 1 is a block diagram illustrating a schematic configuration of an ignition device according to Embodiment 1.
  • FIG. 3 is a block diagram showing another schematic configuration of the ignition device according to Embodiment 1.
  • FIG. 3 is a timing chart showing a schematic operation sequence of the ignition device according to Embodiment 1.
  • FIG. 1 is a configuration diagram of an ignition device according to Embodiment 1.
  • FIG. 3 is a timing chart showing an operation sequence of the ignition device according to Embodiment 1.
  • FIG. 3 is a flowchart showing an operation sequence of the ignition device according to Embodiment 1. It is a part of flowchart which showed the operation
  • FIG. 5A It is a part of flowchart which showed the operation
  • 6 is a configuration diagram of an ignition device according to Embodiment 2.
  • FIG. 6 is a timing chart showing an operation sequence of the ignition device according to Embodiment 2.
  • 6 is a flowchart showing an operation sequence of the ignition device according to Embodiment 2.
  • FIG. 10 is a timing chart showing an operation sequence of the ignition device according to Embodiment 3, and is a diagram illustrating an operation at a timing when a plurality of DC / AC conversion devices do not output AC power simultaneously.
  • FIG. 10 is a timing chart showing another operation sequence of the ignition device according to Embodiment 3, and is a diagram illustrating an operation at a timing at which a plurality of DC / AC conversion devices simultaneously output AC power.
  • FIG. 10 is a flowchart showing an operation sequence of the ignition device according to Embodiment 3.
  • FIG. 6 is a block diagram showing a schematic configuration of an ignition device according to a fourth embodiment.
  • FIG. 10 is a timing chart showing an operation sequence of the ignition device according to Embodiment 4, and is a diagram illustrating an operation at a timing when a plurality of DC / AC conversion devices do not output AC power simultaneously.
  • FIG. 10 is a timing chart showing another operation sequence of the ignition device according to Embodiment 4, and is a diagram illustrating an operation at a timing at which a plurality of DC / AC conversion devices simultaneously output AC power.
  • 6 is a flowchart showing an operation sequence of an ignition device according to a fourth embodiment.
  • 3 is a hardware configuration diagram of a control device for an ignition device according to Embodiments 1 to 4.
  • FIG. 1A is a block diagram showing a schematic configuration of an ignition device 10 according to Embodiment 1.
  • a spark plug 1 ignites fuel in a combustion chamber of an internal combustion engine in response to an ignition command signal output for each ignition cycle from an engine control unit (not shown).
  • the DC / AC converter 2 converts the energy supplied from the power supply capacitor 4 from DC power to AC power and outputs it so that plasma discharge occurs between the electrodes of the spark plug 1.
  • the DC / DC converter 5 converts electric power from a DC power source 6 formed of a battery or the like mounted on the vehicle into a predetermined DC voltage value that is set in advance and outputs it to the power supply capacitor 4.
  • the control device 8 includes a first power cut-off device 3, a DC / AC conversion device 2, and a DC / DC conversion that conduct and cut off a first electric circuit that supplies DC power from the power supply capacitor 4 to the DC / AC conversion device 2.
  • the operation of the device 5 is controlled.
  • the DC / AC conversion device 2 and the DC / DC conversion device 5 include semiconductor elements as switching elements in their circuit configurations.
  • FIG. 1B is a block diagram showing another schematic configuration of the ignition device 11 according to the first embodiment.
  • 1A is further provided with a second power interrupting device 7 for conducting and interrupting a second electric circuit for supplying DC power from the DC power source 6 to the DC / DC converter 5.
  • the control device 8 also performs operation control of the second power cut-off device 7.
  • FIG. 2 is a schematic sequence of an ignition operation according to the configuration of FIGS. 1A and 1B.
  • the horizontal axis represents time
  • the vertical axis represents signal, current, and voltage output values
  • the first and second power shut-off devices indicate the states of conduction and cutoff.
  • An ignition operation is started in the internal combustion engine in response to an ignition command signal output every ignition cycle (T i ) from an engine control unit (not shown).
  • This ignition command signal may be generated inside the control device 8 instead of an external input.
  • the control device 8 cuts off the second electric circuit by the second power cut-off device 7 in accordance with the ignition command signal (configuration in FIG. 1B). Alternatively, the controller 8 stops the operation of the DC / DC converter 5 (configuration in FIG. 1A).
  • the control unit 8 to conduct the first path by the first power cutoff device 3. Electric power is supplied from the power supply capacitor 4 to the DC / AC converter 2, and DC power is converted into AC power.
  • DC / AC converter 2 outputs the AC power to the spark plug 1 as the ignition operation. As a result, a high alternating voltage is applied between the electrodes of the spark plug 1 to generate discharge plasma and ignite the fuel of the internal combustion engine.
  • DC / AC converter 2 At this time, power is supplied to the DC / AC converter 2 from the power supply capacitor 4.
  • DC / AC converter 2 at the timing t 5 after discharge is generated between the spark plug 1 of the time T ac necessary for ignition, DC / AC converter 2 stops outputting the AC power.
  • the control unit 8 blocks the first path by the first power cutoff device 3, DC / AC converter The applied voltage of 2 quickly decreases.
  • the controller 8 causes the conduction path by the second power cutoff device 7.
  • the control device operates the DC / DC conversion device 5.
  • the power supply capacitor 4 is charged by the output power of the DC / DC converter 5.
  • control unit 8 is cut off first path by the first power cutoff device 3, no voltage is applied to the DC / AC converter 2 until the next timing t 2.
  • the above sequence operation is repeated for each ignition cycle T i.
  • Typical ignition cycle T i is about 30 ⁇ 100ms.
  • the output period Tac of the output current from the DC / AC converter 2 is about 100 ⁇ s.
  • the period during which the output voltage of the DC / DC conversion device 5 is applied to the DC / AC conversion device 2 substantially coincides with the period during which the first power cut-off device 3 is conducted through the first electric circuit.
  • the first power cut-off device 3 cuts off the first electric circuit during the period in which the DC / AC conversion device 2 does not output AC power to the spark plug 1, and the high-power semiconductor element of the DC / AC conversion device 2 is high. No voltage is applied. Therefore, the period during which a high voltage is applied to the semiconductor element of the DC / AC converter 2 within one cycle is shortened. As a result, the probability of SEB occurring in the semiconductor element of the DC / AC converter 2 is reduced without applying a large high-voltage element, which contributes to downsizing of the ignition device.
  • a voltage detection means between the DC / DC converter 5 and the DC power source 6 to confirm that the potential difference is within an allowable range and operate the DC / DC converter 5.
  • a voltage detection means may be provided between the second power cut-off device 7 or the switching element and the DC / DC conversion device 5.
  • FIG. 3 is a configuration diagram of the ignition device 100 according to Embodiment 1, and shows a specific circuit configuration of FIG. 1B.
  • the ignition device 100 stores the ignition plug 1, a DC / AC conversion device 20 that converts DC power into AC power and outputs the AC power, and energy supplied to the DC / AC conversion device 20.
  • a first power cut-off device 30 for conducting and cutting off a first electric circuit for supplying DC power from the power supply capacitor 4 to the DC / AC converter 20, and a DC power from the DC power source 6 to the DC / DC converter 50.
  • Second power cut-off device 70 for conducting and cutting-off the second electric circuit for supplying DC, AC / DC converter 20, DC / DC converter 50, first power cut-off device 30 and second power cut-off device And a control unit 8 for controlling the operation of the 0.
  • the second power interruption device 70 includes a first relay means 71, a second relay means 72, and a resistor 73, and the second relay means 72 is connected between the positive electrode side of the DC power supply 6 and the DC / DC converter 50. Is done.
  • the resistor 73 and the first relay means 71 are connected in series.
  • One end of the first relay means 71 is connected to the DC / DC converter 50, and one end of the resistor 73 is connected to the positive electrode side of the DC power supply 6. That is, the second power interruption device 70 includes a circuit in which a resistor 73 and a first relay means 71 are connected in series and a second relay means 72 is connected in parallel. Although they are connected as described above in FIG.
  • the first relay means 71 and the resistor 73 may be interchanged with each other.
  • the second power cut-off device 70 may have a configuration other than the circuit shown in FIG. 3 as long as it has a function of cutting off the second electric circuit that transmits DC power.
  • the relay means may be configured in any way as long as the electrical circuit can be turned on and off, such as a mechanical relay or a semiconductor switch.
  • the DC / DC converter 50 includes a first voltage detecting means 51 that detects an applied voltage of the DC / DC converter 50, an inductor 52 having one end connected to the second power cut-off device 70, and a capacitor for supplying power. 4 and a semiconductor switch 54 connected between a series connection point of the inductor 52 and the diode 53 and GND.
  • the inductor 52, the diode 53, and the semiconductor switch 54 constitute a boost chopper circuit.
  • the DC power source 6 has an output voltage of about 12 V, for example, as an on-vehicle power source. The output voltage is converted to about several tens to several hundreds V by a step-up chopper circuit, and the power supply capacitor 4 is charged. Note that the DC / DC converter 50 only needs to convert the output voltage of the DC power supply 6 into a predetermined voltage, and may have a configuration other than the step-up chopper circuit shown in FIG.
  • the first power cut-off device 30 includes a third relay means 31, a fourth relay means 32, and a resistor 33.
  • the fourth relay means 32 is connected between the power supply capacitor 4 and the DC / AC converter 20.
  • the resistor 33 and the third relay means 31 are connected in series.
  • One end of the third relay means 31 is connected to the DC / AC converter 20, and one end of the resistor 33 is connected to the positive electrode side of the power supply capacitor 4.
  • the first power interruption device 30 includes a circuit in which a resistor 33 and third relay means 31 are connected in series and a fourth relay means 32 is connected in parallel. Although they are connected as described above in FIG. 3, the third relay means 31 and the resistor 33 may be interchanged with each other.
  • the first power cut-off device 30 may have a configuration other than the circuit shown in FIG. 3 as long as it has a function of cutting off an electric circuit that transmits DC power.
  • the relay means may be configured by any means as long as the electrical circuit can be turned on and off, such as a mechanical relay and a semiconductor switch.
  • the DC / AC converter 20 includes a diode 28, second voltage detection means 21 that detects an applied voltage of the DC / AC converter 20, and a voltage stabilization capacitor 22 that stabilizes the applied voltage of the DC / AC converter 20. And a discharge resistor 23 for discharging the charge of the voltage stabilizing capacitor 22, semiconductor switches 24 and 25, a transformer 26, and a step-up reactor 27 connected between the transformer 26 and the spark plug 1.
  • the transformer 26 has a center tap on the primary winding, and the center tap of the transformer 26 is connected to the voltage stabilizing capacitor 22.
  • the semiconductor switch 24 is connected between the first primary winding 26a of the transformer 26 and GND, and the semiconductor switch 25 is connected between the second primary winding 26b of the transformer 26 and GND. .
  • the semiconductor switches 24 and 25 and the transformer 26 form a push-pull amplifier circuit, and a DC voltage is converted into an AC voltage by alternately turning on and off the semiconductor switches 24 and 25.
  • the DC / AC converter 20 may have a configuration different from that shown in FIG. 3 as long as it can convert DC power into AC power having a predetermined frequency.
  • One end of the secondary winding 26 c of the transformer 26 is connected to the boost reactor 27, and the other end is connected to the GND side electrode of the spark plug 1.
  • the step-up reactor 27 forms a resonance circuit together with the parasitic capacitance of the spark plug 1, and an alternating current having a resonance frequency of the resonance circuit is applied to generate a high voltage between the electrodes of the spark plug 1.
  • the boost reactor 27 may be removed. Further, for the purpose of adjusting the resonance frequency, a resonance circuit in which a capacitor is added in series or in parallel to the boost reactor 27 or the spark plug 1 may be formed.
  • the control device 8 controls the DC / AC conversion device 20, the first power cut-off device 30, the DC / DC conversion device 50, and the second power cut-off device 70, and the first voltage detection means 51 and the second voltage detection means 21. To detect the voltage at the target location.
  • the semiconductor switches 24, 25, and 54 of the DC / DC converter 50 and the DC / AC converter 20 may be any elements as long as they are semiconductor switches. For example, an IGBT (Insulated-Gate Bipolar Transistor) or a MOSFET (Metal-Oxide). -Semiconductor Field-Effect Transistor) is used.
  • FIG. 5A shows the entire operation sequence
  • FIG. 5B shows the detailed operation sequence of step S02 for conducting the first circuit in FIG. 5A
  • FIG. 5C shows the second circuit in FIG. 5A.
  • the ignition device 100 performs an ignition operation for causing the internal combustion engine to generate combustion in response to an ignition command signal output for each ignition cycle from an engine control unit (not shown).
  • the ignition command signal may be generated inside the control device 8 instead of an external input.
  • control unit 8 blocks the second path by the second power cutoff device 70 in response to the ignition command signal. That is, the control device 8 turns off both the first relay means 71 and the second relay means 72 (step S01).
  • control unit 8 to conduct the first path by the first power cutoff device 30 (step S02).
  • step S02 reference is made to the inside of the broken line frame in FIG. 5B.
  • Control device 8 potential difference between the output voltage command value V 1 of the second voltage detecting unit with a voltage applied of the detected DC / AC converter 20 by 21, the detection voltage and the DC / DC converter 50, i.e.
  • the first A potential difference ⁇ V a before and after the power interruption device 30 is calculated and compared with a predetermined allowable voltage V 1 ′ described later (step S21). If the potential difference ⁇ V a is larger than V 1 ′, for example V 1 , an excessive inrush current may occur when the fourth relay means 32 of the first power cut-off device 30 is turned on. In that case, it is necessary to apply a large element capable of flowing a large current to the fourth relay means 32. Therefore, the control device 8 turns on the third relay means 31 connected to the resistor 33 prior to the fourth relay means 32 (step S22). As a result, the inrush current is suppressed by the resistor 33, and power is supplied from the power supply capacitor 4 to the DC / AC converter 20.
  • the potential difference ⁇ V a before and after the first power cut-off device 30 gradually decreases from V 1 as shown in the time chart. If the potential difference ⁇ V a is reduced, the inrush current is also reduced. Therefore, a small element can be applied to the relay means, which contributes to downsizing of the ignition device.
  • the potential difference before and after the first power cut-off device 30 such that the inrush current generated when the fourth relay means 32 of the first power cut-off device 30 is turned on is equal to or less than the allowable value is defined as V 1 ′.
  • the timing when the potential difference ⁇ V a before and after the power interruption device 30 becomes equal to or lower than V 1 ′ is defined as t 3 .
  • the allowable value of the inrush current is desirably determined by the maximum rated current of an element existing on the path through which the inrush current flows, for example, as in the fourth relay unit 32 of the first power cut-off device 30.
  • the control unit 8 after the fourth relay means 32 on and turns off the third relay unit 31 (step S23).
  • the control unit 8 since the supply current from the power supply capacitor 4 does not flow into the resistor 33 during the ignition operation of the DC / AC converter 20, the power loss in the resistor 33 is reduced.
  • a rush that occurs at the moment when the fourth relay means 32 is turned on may be about 100 ns.
  • the current and the surge voltage generated at the moment when the third relay means 31 is turned off are reduced.
  • the control unit 8 after the fourth relay means 32 is turned on from the timing t 3 after a predetermined period of time, it may be turned off third relay means 31, in which case the rush current becomes smaller.
  • the series of operations of the first power interruption device 30 from the timing t 2 to the timing t 3 described above is performed when the potential difference ⁇ V a before and after the first power interruption device 30 at the timing t 2 is large and the inrush current exceeds the allowable value. Is.
  • Step S23A If the potential difference ⁇ V a before and after the first power cut-off device 30 at timing t 2 is small and the inrush current is less than the allowable value, the third relay means is not turned on at timing t 2 and the fourth relay means 32 is turned on. (Step S23A).
  • DC / AC converter 20 outputs the AC power to the spark plug 1 as the ignition operation (step S03).
  • a high alternating voltage is applied between the electrodes of the spark plug 1 to generate discharge plasma and ignite the fuel of the internal combustion engine.
  • DC / AC converter 20 is performed from the power supply capacitor 4.
  • DC / AC converter 20 the timing t 5 after discharge is generated between the spark plug of the time T ac needed for ignition, DC / AC converter 20 stops outputting the AC power (step S04) .
  • the control unit 8 blocks the first path by the first power cutoff device 30 (step S05). That is, the control device 8 turns off both the third relay means 31 and the fourth relay means 32. As a result, the DC / AC converter 20 is disconnected from the power supply capacitor 4. Since the charges charged in the parasitic capacitors such as the voltage stabilizing capacitor 22 and the semiconductor switches 24 and 25 of the DC / AC converter 20 are discharged by the discharge resistor 23, the applied voltage of the DC / AC converter 20 is promptly applied. descend.
  • step S06 the controller 8 causes the conduct second path by the second power cutoff device 70 (step S06).
  • step S06 reference is made to the inside of the broken line frame in FIG. 5C. Controller 8, using the voltage applied to the DC / DC converter 50 detected by the first voltage detecting means 51, the potential difference between the detection voltage and the output voltage V 2 of the DC power supply 6, i.e. the second power cutoff device 70
  • the front-rear potential difference ⁇ V b is calculated and compared with a predetermined allowable voltage V 2 ′ described later (step S61).
  • the control device 8 turns on the first relay means 71 connected to the resistor 73 prior to the second relay means 72 (step S62). As a result, the inrush current is suppressed by the resistor 73, and power is supplied from the DC power supply 6 to the DC / DC converter 50. As shown in the time chart, the potential difference ⁇ V b before and after the second power cut-off device 70 gradually decreases from V 2 .
  • V b becomes even rush current becomes smaller small, can apply a small element in the relay unit, which contributes to downsizing of the ignition device.
  • the potential difference between the front and rear of the second power cut-off device 70 such that the inrush current generated when the second relay means 72 of the second power cut-off device 70 is turned on is equal to or less than the allowable value is defined as V 2 ′.
  • the timing at which the potential difference ⁇ V b before and after the power interruption device 70 becomes equal to or lower than V 2 ′ is t 8 .
  • the allowable value of the inrush current in the present embodiment can be determined by the maximum rated current of the second relay means 72 of the second power cut-off device 70. When other elements are provided between the DC power supply 6 and the inductor 52 on the path through which the inrush current flows, it is desirable to determine the maximum rated current of these elements.
  • the control unit 8 after turning on the second relay means 72, turning off the first relay means 71 (step S63).
  • the current supplied from the DC power supply 6 to the DC / DC converter 50 does not flow into the resistor 73, so that the power loss in the resistor 73 is reduced.
  • an inrush current generated at the moment when the second relay means 72 is turned on and the first relay The surge voltage generated at the moment when the means 71 is turned off is reduced.
  • the control unit 8 may be to turn on the second relay means 72 from the timing t 8 after a predetermined time has elapsed, in which case the rush current becomes smaller.
  • the series of operations of the second power cut-off device 70 from the timing t 7 to the timing t 8 described above is performed when the potential difference ⁇ V b before and after the second power cut-off device 70 at the timing t 7 is large and the inrush current exceeds the allowable value. Is.
  • the first relay means 71 is not turned on and the second relay means 72 is turned on at timing t 7 .
  • Step S63A In the timing t 7 after, the output power of the DC / DC converter 50, the power supply capacitor 4 is charged. However, since the control unit 8 is cut off first path by the first power cutoff device 30, no voltage is applied to the DC / AC converter 20 to a timing t 2.
  • the period during which the output voltage of the DC / DC conversion apparatus 50 is applied to the DC / AC conversion apparatus 20 substantially coincides with the period during which the first power cut-off device 30 is conducting the first electric circuit.
  • the period during which DC / AC converter 20 does not output the AC power to the spark plug 1 i.e. the period except for between the time chart in t 4 and t 5, the first path is the first power cutoff device 30 Therefore, the period during which a high voltage is applied to the semiconductor switch of the DC / AC converter 20 is shortened.
  • the time chart of FIG. 4 shows an example in which the first power cut-off device 30 cuts off the first electric circuit once in a period in which the DC / AC conversion device 20 does not output AC power to the spark plug 1. You may block several times.
  • the second power cut-off device 70 and the first power cut-off device 30 operate simultaneously in a sequence that does not conduct the electric circuit, so that the electric circuit from the DC power supply 6 to the DC / AC converter 20 is always cut off.
  • the DC power source 6 is short-circuited. No current flows, and only the charge charged in the capacitor on the circuit is discharged.
  • the short-circuit current that flows until the fuse (not shown) and the protection circuit (not shown) are operated is reduced, and the instantaneous heat generated in the elements constituting the relay means on the short-circuit current path is reduced.
  • the second power cut-off device 70 and the first power cut-off device 30 operate in a sequence that does not conduct the electric circuit at the same time. Contributes to the miniaturization of the ignition device.
  • Operation of the first power cut-off device 30 from the timing t 2 to time t 3 may not necessarily be carried out based on the detected voltage of the second voltage detector 21, it may be carried out according to the operation sequence which is set in advance.
  • the peak value I p2 of the inrush current can be calculated by the following equation (1) from the potential difference ⁇ V a before and after the first power cut-off device 30 and the value of the resistor 33.
  • R 33 is the resistance value of the resistor 33.
  • the potential difference ⁇ V a before and after the first power cut-off device 30 can be calculated from the values of the resistor 33 and the voltage stabilizing capacitor 22 by the following equation (2).
  • V 1 is the output voltage of the DC / DC converter 50
  • e is the number of Napiers
  • ⁇ t 2 is the elapsed time from the timing t 2
  • C 22 is the capacitance of the voltage stabilizing capacitor 22.
  • I p ′ is an allowable value of the inrush current
  • ln is a natural logarithm.
  • operation of the second power cutoff device 70 from the timing t 7 to the timing t 8 does not necessarily need to be performed on the basis of the detected value of the first voltage detector 51, even if carried out according to the operation sequence preset Good.
  • the operation sequence of the second power cut-off device 70 may be determined in the same manner as the method for determining the operation of the first power cut-off device 30 from the timing t 2 to the timing t 3 described above using the equations (1) to (3).
  • the operation sequence thus determined may be replaced with step S63 in FIG. 5C.
  • the voltage value detected by the second voltage detecting means 21 increases as shown by the applied voltage of the DC / AC converter 20 in FIG. Can be determined to have occurred. That is, even if the threshold voltage V th for short-circuit detection is set and the timing t 10 at which the threshold voltage V th is applied to the DC / AC converter 20 has elapsed, the detection value of the second voltage detection means 21 is V If it is less than th , the control device 8 can determine that the ignition device is in a short circuit state or a ground fault state.
  • the threshold voltage V th is a value smaller than the output voltage command value V 1 of the DC / DC converter 50.
  • the timing t 10 is the time from turn on the third relay unit 31 at the timing t 2 to Delta] t 10 elapses, the elapsed time Delta] t 10 is calculated by the following equation (4).
  • the control device 8 After determining the short circuit state or the ground fault state, the control device 8 interrupts each electric circuit by the second power interrupt device 70 and the first power interrupt device 30. As a result, the short-circuit current is interrupted, and abnormal heat generation of the elements on the short-circuit current path can be suppressed. Therefore, the element at the time of occurrence of a short circuit can be prevented from generating heat to a temperature higher than the heat-resistant temperature without always being cooled by a large heat sink or fan, which can contribute to downsizing of the ignition device.
  • FIG. FIG. 7 is a configuration diagram of the ignition device 200 according to the second embodiment.
  • the ignition device 200 according to the second embodiment removes the second power cut-off device 70 and the DC / DC converter 50 from the ignition device of FIG. 3 according to the first embodiment, and between the DC power source 6 and the power supply capacitor 4.
  • an insulation type DC / DC converter 90 having a function of converting a DC voltage into a predetermined voltage value while insulating the positive electrode side of the DC power supply 6 and the power supply capacitor 4 is arranged. is there. This corresponds to the detailed circuit diagram of FIG. 1A in the first embodiment.
  • the semiconductor switch 92 included in the insulated DC / DC converter 90 is configured to be controlled by the control device 8.
  • the insulation type DC / DC converter 90 is configured by a flyback converter circuit as an example, and one end of the primary side winding 91 a is connected to the positive side of the DC power supply 6, and the secondary side winding.
  • One end of the transformer 91 is connected to the negative electrode side of the power supply capacitor 4, and the semiconductor switch 92 is connected between the other end of the primary winding 91 a of the transformer 91 and the negative electrode side of the DC power supply 6.
  • a diode 93 connected between the other end of the secondary winding 91 b of the transformer 91 and the positive electrode side of the power supply capacitor 4.
  • the insulated DC / DC converter 90 only needs to convert a DC voltage into a predetermined voltage value while insulating the positive electrode side of the DC power supply 6 and the power supply capacitor 4, and the flyback converter circuit shown in FIG. Other configurations may be used. Other configurations of the ignition device according to the second embodiment are the same as those of the first embodiment.
  • FIG. 9A shows the entire operation sequence
  • FIG. 9B shows the detailed operation sequence for step S101 for conducting the first electric circuit.
  • the ignition device performs an ignition operation for causing the internal combustion engine to generate combustion in response to an ignition command signal output for each ignition cycle (T i ) from an engine control unit (not shown).
  • the ignition command signal may be generated inside the control device 8 instead of an external input.
  • the control unit 8 in response to the ignition signal, thereby turning the electric path by the first power cutoff device 30 (step S101).
  • Step S101 will be described within a broken line frame in FIG. 9B.
  • Step S1011 the output voltage command value V 3 of the second voltage detector 21 applied voltage of the DC / AC converter 20 detected by the insulation type DC / DC converter 90
  • the potential difference that is, the potential difference ⁇ V a before and after the first power cut-off device 30 is compared with a predetermined allowable voltage V 1 ′ (step S1012). If ⁇ V a is larger than the allowable voltage V 1 ′, an excessive inrush current may occur when the fourth relay means 32 of the first power cut-off device 30 is turned on. Therefore, the control device 8 turns on the third relay means 31 to which the resistor 33 is connected prior to the fourth relay means 32 (step S1013).
  • the potential difference ⁇ V a before and after the first power cut-off device 30 is as shown in the time chart. Decrease gradually.
  • the potential difference ⁇ V a before and after the first power cut-off device 30 such that the inrush current generated when the fourth relay means 32 of the first power cut-off device 30 is turned on is equal to or less than the allowable value is V 1 ′
  • the timing at which the potential difference ⁇ V a before and after the first power cut-off device 30 becomes equal to or lower than V 1 ′ is t 22 .
  • the control unit 8 After the fourth relay means 32 on and turns off the third relay unit 31 (step S1014). Thereby, since the supply current from the power supply capacitor 4 does not flow into the resistor 33 during the ignition operation of the DC / AC converter 20, the power loss in the resistor 33 is reduced. In addition, by providing a period in which both the third relay means 31 and the fourth relay means 32 are turned on at the same time, the inrush current generated at the moment when the fourth relay means 32 is turned on and the third relay means 31 are The surge voltage generated at the moment of turning off is reduced.
  • the control unit 8 may be turned on a fourth relay means 32 from the timing t 22 after a predetermined time has elapsed, in which case the rush current becomes smaller.
  • the series of operations of the first power cut-off device 30 from the timing t 21 to the timing t 22 described above is performed when the potential difference ⁇ V a before and after the first power cut-off device 30 at the timing t 21 is large and the inrush current exceeds the allowable value. Is. If the potential difference ⁇ V a before and after the first power cut-off device 30 at timing t 21 is small and the inrush current is less than the allowable value, the third relay means 31 is not turned on and the fourth relay means 32 is turned on at timing t 21 . You may do (step S1014A). In the timing t 22 after the predetermined time t 23, DC / AC converter 20 outputs the AC power to the spark plug 1 as the ignition operation (step S102).
  • the control unit 8 blocks the first path by the first power cutoff device 30 (step S104). That is, the control device 8 turns off both the third relay means 31 and the fourth relay means 32. As a result, the DC / AC converter 20 is disconnected from the power supply capacitor 4. Since the electric charge charged in the voltage stabilizing capacitor 22 and the parasitic capacitance of the DC / AC converter 20 is discharged by the discharge resistor 23, the applied voltage of the DC / AC converter 20 rapidly decreases. The operation of the above timing t 21 to the timing t 25, repeated every ignition cycle T i.
  • the period during which the output voltage of the insulation type DC / DC converter 90 is applied to the DC / AC converter 20 substantially coincides with the period during which the first power cut-off device 30 is conducting the first electric circuit.
  • the first power cut-off device 30 is configured so that the DC / AC converter 20 does not output the AC power to the spark plug 1, that is, the period excluding the interval between t 23 and t 24 in the time chart. Since the electric circuit has a period during which the first power cut-off device 30 is cut off, the period during which a high voltage is applied to the semiconductor switches 24 and 25 of the DC / AC converter 20 is shortened.
  • the probability of SEB occurring in the semiconductor switches 24 and 25 of the DC / AC converter 20 is reduced without applying a large high-voltage element, which contributes to downsizing of the ignition device.
  • the example in which the first power cut-off device 30 cuts off the first electric circuit once during the period in which the DC / AC conversion device 20 does not output AC power to the spark plug 1 is shown. You may block several times. Further, while the isolated DC / DC converter 90 is not operating, the DC power supply 6 and the circuit subsequent to the insulated DC / DC converter 90 are insulated.
  • the DC power supply 6 is short-circuited. No current flows, and only the charge charged in the capacitor on the circuit is discharged.
  • the short-circuit current is reduced compared to the case where the DC power supply 6 and the short-circuit portion or the ground fault generating portion are connected to generate a very large short-circuit current, and the elements constituting the relay means on the short-circuit current path Instantaneous heat generation that occurs in is reduced. Therefore, the heat sink can be reduced in size, which contributes to downsizing of the ignition device.
  • Operation of the first power cut-off device 30 from the timing t 21 to the timing t 22 does not necessarily need to be performed on the basis of the detected value of the second voltage detector 21, it may be carried out according to the operation sequence which is set in advance.
  • the operation sequence of the first power cut-off device 30 can be determined using the time calculated by the equations (1) to (3).
  • the second voltage detecting means 21 and the formula By controlling using the threshold voltage and time calculated from 4), a short circuit can be detected, and abnormal heating of elements on the short circuit path when a short circuit occurs can be prevented. Thereby, the heat sink of an element can be made small and it contributes to size reduction of an ignition device.
  • Embodiment 3 FIG.
  • the example in which the ignition plug is ignited by one ignition device on the assumption that the internal combustion engine has one combustion chamber, that is, one cylinder has been described.
  • a plurality of cylinders are ignited by one ignition device.
  • Some internal combustion engines have a plurality of cylinders for burning fuel, and all of the cylinders require an ignition operation by an ignition device.
  • an ignition device is provided for each cylinder, the device volume is increased by the number of cylinders, resulting in an increase in the size of the device.
  • the third embodiment a configuration and operation for supplying electric power from one ignition device to a plurality of spark plugs when the internal combustion engine has a plurality of cylinders will be described.
  • a case where the internal combustion engine has two cylinders will be described as an example, and the configuration and operation sequence of the apparatus will be described.
  • FIG. 10 is a block diagram showing a schematic configuration of the ignition device 12 according to the third embodiment.
  • a spark plug 101 for the first cylinder and a spark plug 102 for the second cylinder are arranged in the combustion chamber of the internal combustion engine in accordance with an ignition command signal output at every ignition cycle from an engine control unit (not shown). Ignite the fuel. Since the ignition timing differs depending on the cylinder, each cylinder operates based on the respective ignition command signals.
  • the DC / AC converter 121 for the first cylinder converts the energy supplied from the power supply capacitor 4 from DC power to AC power so that plasma discharge occurs between the electrodes of the spark plug 101 of the first cylinder. Output.
  • the DC / AC converter 122 of the second cylinder converts the energy supplied from the power supply capacitor 4 from DC power to AC power so that plasma discharge occurs between the electrodes of the spark plug 102 of the second cylinder. Output.
  • the DC / DC converter 5 converts electric power from a DC power source 6 formed of a battery or the like mounted on the vehicle into a predetermined DC voltage value that is set in advance and outputs it to the power supply capacitor 4.
  • the control device 8 conducts and cuts off a first electric circuit that supplies DC power from the power supply capacitor 4 to the DC / AC converter 121 of the first cylinder and the DC / AC converter 122 of the second cylinder.
  • Power interruption device 3 for conducting and cutting off a second electric circuit for supplying DC power from DC power supply 6 to DC / DC conversion device 5, first cylinder DC / AC conversion device 121, second The operation of the cylinder DC / AC converter 122 and the DC / DC converter 5 is controlled.
  • the DC / AC converter 121 of the first cylinder, the DC / AC converter 122 of the second cylinder, and the DC / DC converter 5 include semiconductor elements as switching elements in their circuit configurations.
  • the DC power source 6, the second power cutoff device 7, the control device 8, the DC / DC conversion device 5, the power supply capacitor 4, and the first power cutoff device 3 are provided.
  • the second power cut-off device 7 may be configured as the second power cut-off device 70 in FIG. 3
  • the first power cut-off device 3 may be configured as the first power cut-off device 30 in FIG. Good.
  • the DC / DC conversion device 5 may be configured like the DC / DC conversion device 50 of FIG.
  • the DC / AC converters 121 and 122 may be configured as the DC / AC converter 20 in FIG. 3, and any device that can convert DC power into AC power and output the DC power is available. It may be configured.
  • an ignition operation is performed based on an ignition command flag FLG that is output in response to an ignition command signal that indicates the ignition timing of each cylinder.
  • the control device 8 changes the first cylinder ignition command flag FLG1 to “1”.
  • the control device 8 performs ignition with the ignition plug 101 for the first cylinder.
  • the first cylinder ignition operation is performed based on the first cylinder ignition command flag FLG1
  • the second cylinder ignition operation is performed based on the second cylinder ignition command flag FLG2.
  • the ignition timing and the AC power output period to the ignition plug vary depending on the type of the internal combustion engine and the operating conditions, and may differ for each cylinder.
  • AC power output period to the ignition plug determined on the basis of the time T ac necessary for ignition, the time T ac needed for ignition is defined as the time to exhibit the ignition performance of the object.
  • the time required for ignition of the first cylinder T ac1 denoted the time required for ignition of the second cylinder as T ac2.
  • FIG. 11A shows an operation sequence in which the ignition timings of the first cylinder and the second cylinder do not overlap
  • FIG. 11B shows an operation sequence having a period in which the ignition timings of the first cylinder and the second cylinder overlap. . Having a period in which the ignition timings of the first cylinder and the second cylinder overlap each other means that the AC power is output to both cylinders simultaneously.
  • the controller 8 causes the conductive first electrical path by a first power cutoff device 3 (step S203). Electric power is supplied from the power supply capacitor 4 to the DC / AC converter 121 of the first cylinder and the DC / AC converter 122 of the second cylinder.
  • DC / AC converter 121 in response to the ignition command flag FLG1, converts DC power into AC power and outputs the spark plug 101 (step S204).
  • the DC / AC converter 121 outputs AC power to the spark plug 101 for the time T ac1 required for ignition of the first cylinder. Thereby, an alternating high voltage is applied between the electrodes of the spark plug 101 to generate discharge plasma.
  • the fuel in the first cylinder of the internal combustion engine is ignited by discharge plasma.
  • power supply to the DC / AC converter 121 of the first cylinder is performed from the power supply capacitor 4.
  • the control device 8 confirms the ignition command flag FLG2 of the cylinder in which the AC power output is stopped, that is, the second cylinder, and determines the subsequent operation of the ignition device 12 (step S205). If the ignition command flag FLG2 is “1”, the DC / AC converter 122 of the second cylinder outputs AC power to the ignition plug 102 of the second cylinder. If the ignition command flag FLG2 is “0”, only the first cylinder outputting AC power continues the ignition operation. When the controller 8 determines that the DC / AC converter 121 has output AC power to the spark plug 101 for the time Tac1 required for ignition, the controller 8 proceeds to the next operation (step S206).
  • step S207 the control unit 8 stops the AC power output of the DC / AC converter 121, an ignition command The flag FLG1 is changed to “0” (step S207).
  • the control device 8 shifts to the next operation in order to end the ignition operation (YES in step S208).
  • the ignition command flag FLG is “1” in any cylinder (NO in step S208)
  • the ignition command flags FLG of all the cylinders become “0” according to the operation flow from step S206 to step S208.
  • AC power is output to the spark plug of the corresponding cylinder.
  • the control unit 8 first power cutoff device 3 cuts off the first electric circuit (step S209).
  • the applied voltage between the DC / AC converter 121 of the first cylinder and the DC / AC converter 122 of the second cylinder quickly decreases.
  • the controller 8 causes the conduct second path by the second power cutoff device 7 (step S210).
  • the power supply capacitor 4 is charged by the output power of the DC / DC converter 5.
  • control device 8 cuts off the first electric circuit by the first power cut-off device 3, the DC / AC conversion device 121 of the first cylinder until the ignition command signal is input to any one of the cylinders next time. No voltage is applied to the DC / AC converter 122 of the second cylinder.
  • step S201 After determining that the ignition command flag of one of the cylinders is “1”, the control device 8 cuts off the second electric circuit by the second power cut-off device 7 (step S202).
  • step S203 the controller 8 causes the conductive first electrical path by a first power cutoff device 3 (step S203). Electric power is supplied from the power supply capacitor 4 to the DC / AC converter 121 of the first cylinder and the DC / AC converter 122 of the second cylinder.
  • DC / AC converter 122 in response to the ignition command flag FLG2, and outputs to the spark plug 102 converts DC power to AC power (step S204).
  • the DC / AC converter 122 outputs AC power to the spark plug 102 for a time Tac2 required for ignition. Thereby, an alternating high voltage is applied between the electrodes of the spark plug 102 to generate discharge plasma.
  • the fuel in the second cylinder of the internal combustion engine is ignited by discharge plasma.
  • power is supplied to the DC / AC converter 122 of the second cylinder from the power supply capacitor 4.
  • the control device 8 confirms the ignition command flag FLG1 of the cylinder in which the AC power output is stopped, that is, the first cylinder, and determines the subsequent operation of the ignition device 12 (step S205). If the ignition command flag FLG1 is “1”, the DC / AC converter 121 of the first cylinder outputs AC power to the ignition plug 101 of the first cylinder. If the ignition command flag FLG1 is “0”, only the second cylinder outputting AC power continues the ignition operation. When the control device 8 determines that the DC / AC conversion device 122 has output AC power to the spark plug 102 for the time Tac2 required for ignition, the control device 8 proceeds to the next operation (step S206).
  • step S207 the control unit 8 stops the AC power output of the DC / AC converter 122, the second The cylinder ignition command flag is changed to “0” (step S207).
  • the control device 8 shifts to the next operation in order to end the ignition operation (YES in step S208).
  • the ignition command flag FLG is “1” in any cylinder (NO in step S208)
  • the ignition command flags FLG of all the cylinders become “0” according to the operation flow from step S206 to step S208.
  • AC power is output to the spark plug of the corresponding cylinder.
  • the control unit 8 first power cutoff The first electrical path is interrupted by the device 3 (step S209).
  • the applied voltage between the DC / AC converter 121 of the first cylinder and the DC / AC converter 122 of the second cylinder quickly decreases.
  • the controller 8 causes the conduct second path by the second power cutoff device 7 (step S210).
  • the power supply capacitor 4 is charged by the output power of the DC / DC converter 5.
  • control device 8 cuts off the first electric circuit by the first power cut-off device 3, the DC / AC conversion device 121 of the first cylinder until the ignition command signal is input to any one of the cylinders next time. No voltage is applied to the DC / AC converter 122 of the second cylinder.
  • a typical ignition cycle is about 30 to 100 ms.
  • Power output period T ac1 and T ac2 typical DC / AC converter 121 and the DC / AC converter 122 are each about 100 [mu] s.
  • t 31 ′ and t 41 ′ are the timing of the ignition cycle of the next first cylinder and the timing of the ignition cycle of the next second cylinder, respectively.
  • the controller 8 causes the conductive first electrical path by a first power cutoff device 3 (step S203). Electric power is supplied from the power supply capacitor 4 to the DC / AC converter 121 of the first cylinder and the DC / AC converter 122 of the second cylinder.
  • DC / AC converter 121 in response to the ignition command flag FLG1, and outputs to the ignition plug 101 converts the DC power to AC power (step S204).
  • the DC / AC converter 121 outputs AC power to the spark plug 101 for a time Tac1 required for ignition. Thereby, an alternating high voltage is applied between the electrodes of the spark plug 101 to generate discharge plasma.
  • the fuel in the first cylinder of the internal combustion engine is ignited by discharge plasma. At this time, power is supplied to the DC / AC converter 121 from the power supply capacitor 4.
  • DC / AC converter 122 of the second cylinder in response to the ignition command flag FLG2, and outputs the AC power to the spark plug 102 (step S204).
  • the DC / AC converter 122 outputs AC power to the spark plug 102 for a time Tac2 required for ignition. Thereby, an alternating high voltage is applied between the electrodes of the spark plug 102 to generate discharge plasma.
  • the fuel in the second cylinder of the internal combustion engine is ignited by discharge plasma.
  • power supply to the DC / AC converter 122 is also performed from the power supply capacitor 4.
  • step S206 determination is made based on whether or not the period during which AC power is output in any cylinder is equal to or longer than the time Tac required for ignition. Therefore, if when determining the "AC power output period ⁇ T ac2 of the second cylinder" when the "AC power output period of the first cylinder ⁇ T ac1" is the next operation based on the determination of the second cylinder Transition.
  • the control device 8 After determining that the AC power output period of the DC / AC converter 121 is equal to or greater than T ac1 (timing t 56 ), the control device 8 stops the AC power output of the DC / AC converter 121 and sets the ignition command flag. FLG1 is changed to “0” (step S207). After changing the ignition command flag FLG1 for the first cylinder to “0”, the control device 8 determines whether or not the ignition command flags for all the cylinders are “0” (step S208). At timing t 56, the ignition command flag FLG2 the second cylinder is "1" for (NO at step S208), to the ignition plug 102 to an AC power output period of the second cylinder becomes time T ac2 required ignition Continue AC output.
  • step S207 the control unit 8 stops the AC output to the ignition plug 102, an ignition command flag FLG2 the second cylinder " It is changed to “0” (step S207).
  • step S208 the control device 8 determines whether or not the ignition command flags for all the cylinders are “0” (step S208).
  • step S208 the AC power output in all the cylinders are stopped, because the ignition command flag is "0" (YES in step S208), and proceeds to the next operation.
  • the control unit 8 blocks the first path by the first power cutoff device 3 (step S209).
  • the applied voltage between the DC / AC converter 121 of the first cylinder and the DC / AC converter 122 of the second cylinder quickly decreases.
  • the controller 8 causes the conduct second path by the second power cutoff device 7 (step S210).
  • the power supply capacitor 4 is charged by the output power of the DC / DC converter 5.
  • control device 8 cuts off the first electric circuit by the first power cut-off device 3, the DC / AC conversion device 121 of the first cylinder until the ignition command signal is input to any one of the cylinders next time. No voltage is applied to the DC / AC converter 122 of the second cylinder.
  • t 51 ′ and t 54 ′ are the timing of the ignition cycle of the next first cylinder and the timing of the ignition cycle of the next second cylinder, respectively.
  • the ignition device of the present embodiment can be applied to an internal combustion engine having a larger number of cylinders, and a similar operation can be realized by increasing the number of DC / AC converters and ignition plugs by one for each cylinder. Can do.
  • the DC power source 6, the second power cut-off device 7, the control device 8, the DC / DC conversion device 5, the power supply capacitor 4, and the first power cut-off device 3 have a common configuration.
  • the first power cut-off device 3 that is a single cut-off device is used so that the first power cut-off device 3 connected to the DC / AC conversion device of each cylinder without using a plurality of power cut-off devices. Cut off and conduct one electrical circuit. More specifically, in the ignition device of the third embodiment, when the DC / AC converter outputs AC power in any cylinder in response to the ignition command signal, the first electric circuit 3 And the first electric circuit is cut off during a period in which the DC / AC converters of all the cylinders do not output AC power to the spark plugs. This shortens the period during which a high voltage is applied to the semiconductor element of the DC / AC converter within the ignition cycle of each cylinder. As a result, it is possible to reduce the probability that SEB occurs in the semiconductor element of the DC / AC converter while suppressing the increase in size due to connecting the power cutoff device for each cylinder, which contributes to the size reduction of the ignition device.
  • each DC / AC converter connected to a spark plug arranged in each cylinder is provided with a first power cut-off device, and the first power cut-off device is arranged in accordance with the AC output of each DC / AC converter. Control the power shut-off device.
  • FIG. 13 is a block diagram showing a schematic configuration of the ignition device 13 according to the fourth embodiment.
  • a spark plug 101 for the first cylinder and a spark plug 102 for the second cylinder are provided in the combustion chamber of the internal combustion engine in response to an ignition command signal output every ignition cycle from an engine control unit (not shown). Ignite the fuel. Since the ignition timing differs depending on the cylinder, each cylinder operates based on the respective ignition command signals.
  • the DC / AC converter 121 for the first cylinder converts the energy supplied from the power supply capacitor 4 from DC power to AC power so that plasma discharge occurs between the electrodes of the spark plug 101 of the first cylinder. Output.
  • the DC / AC converter 122 of the second cylinder converts the energy supplied from the power supply capacitor 4 from DC power to AC power so that plasma discharge occurs between the electrodes of the spark plug 102 of the second cylinder. Output.
  • the DC / DC converter 5 converts electric power from a DC power source 6 composed of a battery or the like mounted on the vehicle into a predetermined DC voltage value and outputs the converted voltage to the power supply capacitor 4.
  • the DC power supply 6, the second power cutoff device 7, the control device 8, the DC / DC conversion device 5, and the power supply capacitor 4 are configured in common, and the power supply The first power cut-off device, the DC / AC converter, and the spark plug subsequent to the capacitor 4 are provided for each cylinder.
  • the second power cut-off device 7 may be configured as the second power cut-off device 70 of FIG. 3, and the first power cut-off devices 131 and 132 are configured as the first power cut-off device 30 of FIG. May be.
  • the DC / DC conversion device 5 may be configured like the DC / DC conversion device 50 of FIG. 3, and any device that can convert DC power into a predetermined DC voltage value and output it can be used. It may be a simple configuration.
  • the DC / AC converters 121 and 122 may be configured as the DC / AC converter 20 in FIG. 3, and any device that can convert DC power into AC power and output the DC power is available. It may be configured.
  • the ignition operation is performed based on the ignition command flag FLG output in response to the ignition command signal instructing the ignition timing of each cylinder.
  • the control device 8 changes the first cylinder ignition command flag FLG1 to “1”.
  • the control device 8 performs ignition with the ignition plug 101 for the first cylinder.
  • the ignition operation for the first cylinder is performed based on the ignition command flag FLG1 for the first cylinder, and the ignition operation for the second cylinder is performed based on the ignition command flag FLG2 for the second cylinder.
  • the ignition timing and the AC power output period to the ignition plug vary depending on the type of the internal combustion engine and the operating conditions, and may differ for each cylinder.
  • AC power output period to the ignition plug determined on the basis of the time T ac necessary for ignition, the time T ac needed for ignition is defined as the time to exhibit the ignition performance of the object.
  • the time required for ignition of the first cylinder T ac1 denoted the time required for ignition of the second cylinder as T ac2.
  • FIG. 14A shows an operation sequence in which the ignition timings of the first cylinder and the second cylinder do not overlap.
  • FIG. 14B shows an operation sequence having a period in which the ignition timings of the first cylinder and the second cylinder overlap. . Having a period in which the ignition timings of the first cylinder and the second cylinder overlap each other means that the AC power is output to both cylinders simultaneously.
  • an operation sequence in which the ignition timings of the first cylinder and the second cylinder in FIG. 14A do not overlap will be described.
  • an instruction of the ignition operation start by the ignition command signal of the first cylinder is input to the control unit 8, the ignition command flag FLG1 the first cylinder to "1".
  • the control device 8 starts an ignition operation in the corresponding cylinder (step S301).
  • the control device 8 cuts off the second electric circuit by the second power cut-off device 7 (step S302).
  • the control unit 8 In the timing t 62 after the timing t 61, the control unit 8, the first power cutoff device 131 of the first cylinder ignition command flag FLG is "1", thereby turning on the first circuit of the first cylinder (step S303). Electric power is supplied from the power supply capacitor 4 to the DC / AC converter 121 of the first cylinder.
  • DC / AC converter 121 in response to the ignition command flag FLG1, converts DC power into AC power and outputs the spark plug 101 (step S304).
  • the DC / AC converter 121 outputs AC power to the spark plug 101 for the time T ac1 required for ignition of the first cylinder. Thereby, an alternating high voltage is applied between the electrodes of the spark plug 101 to generate discharge plasma.
  • the fuel in the first cylinder of the internal combustion engine is ignited by discharge plasma.
  • power supply to the DC / AC converter 121 of the first cylinder is performed from the power supply capacitor 4.
  • the control device 8 confirms the ignition command flag FLG2 of the cylinder in which the AC power output is stopped, that is, the second cylinder, and determines the subsequent operation of the ignition device 13 (step S305). If the ignition command flag FLG2 is “1” (YES in step S305), the first electric circuit of the second cylinder is made conductive by the first power cut-off device 132 of the second cylinder, and the DC / AC conversion of the second cylinder is performed. The device 122 outputs AC power to the spark plug 102 of the second cylinder. If the ignition command flag FLG2 is “0” (NO in step S305), only the first cylinder outputting AC power continues the ignition operation.
  • step S305 If there is no cylinder whose AC power output is stopped in step S305, the process proceeds to step S306.
  • the control device 8 proceeds to the next operation (YES in step S306). .
  • the control device 8 stops the AC power output of the DC / AC converter 121, and the ignition command The flag FLG1 is changed to “0”.
  • Output stop of the DC / AC converter 121 of the timing t 64 i.e. at the timing t 65 after a predetermined time has elapsed since the ignition command flag FLG1 the first cylinder becomes "0"
  • the control unit 8 first power cutoff
  • the device 131 shuts off the first electric path of the first cylinder (step S307). When the first electric path of the first cylinder is interrupted, the applied voltage of the DC / AC converter 121 of the first cylinder is quickly reduced.
  • step S308 When it is determined that the ignition command flag FLG in all the cylinders is “0”, the control device 8 shifts to the next operation in order to end the ignition operation (step S308).
  • the ignition command flag FLG is “1” in any cylinder, according to the operation flow from step S306 to step S308, until the ignition command flag FLG of all the cylinders becomes “0”, the ignition plug of the corresponding cylinder AC power is output.
  • the controller 8 causes the conduct second path by the second power cutoff device 7 (step S309).
  • the power supply capacitor 4 is charged by the output power of the DC / DC converter 5.
  • the control device 8 cuts off the first electric path of each cylinder by the first power cut-off device of each cylinder, the DC of the first cylinder is continued until an ignition command signal is input to any one of the cylinders next time. No voltage is applied to the / AC converter 121 and the second cylinder DC / AC converter 122.
  • step S301 instructions of the ignition operation start by the ignition command signal of the second cylinder is input to the control unit 8, the ignition command flag FLG2 of the second cylinder to "1".
  • the control device 8 starts an ignition operation in the corresponding cylinder (step S301).
  • the control device 8 cuts off the second electric circuit by the second power cut-off device 7 (step S302).
  • the control device 8 causes the first electric circuit of the second cylinder to become conductive by the first power cut-off device 132 of the second cylinder whose ignition command flag FLG is “1” (step 1). S303). Electric power is supplied from the power supply capacitor 4 to the DC / AC converter 122 of the second cylinder.
  • DC / AC converter 122 in response to the ignition command flag FLG2, and outputs to the spark plug 102 converts DC power to AC power (step S304).
  • the DC / AC converter 122 outputs AC power to the spark plug 102 for a time Tac2 required for ignition of the second cylinder. Thereby, an alternating high voltage is applied between the electrodes of the spark plug 102 to generate discharge plasma.
  • the fuel in the second cylinder of the internal combustion engine is ignited by discharge plasma. At this time, power is supplied to the DC / AC converter 122 of the second cylinder from the power supply capacitor 4.
  • the control device 8 confirms the ignition command flag FLG2 of the cylinder in which the AC power output is stopped, that is, the first cylinder, and determines the subsequent operation of the ignition device 13 (step S305). If the ignition command flag FLG1 is “1”, the first power cut-off device 131 of the first cylinder makes the first electric path of the first cylinder conductive, and the DC / AC conversion device 121 of the first cylinder turns on the first cylinder. AC power is output to the spark plug 101. If the ignition command flag FLG1 is “0”, only the second cylinder outputting AC power continues the ignition operation. When control device 8 determines that DC / AC converter 122 has output AC power to spark plug 102 for time Tac2 required for ignition, the control device 8 proceeds to the next operation (YES in step S306). .
  • the control unit 8 stops the AC power output of the DC / AC converter 122, an ignition command
  • the flag FLG2 is changed to “0”.
  • Output stop of the DC / AC converter 122 of the timing t 74 i.e. at the timing t 75 after a predetermined time has elapsed the ignition command flag FLG2 is from "0" of the second cylinder, the control unit 8 first power cutoff
  • the device 132 cuts off the first electric path of the second cylinder (step S307). When the first electric path of the second cylinder is interrupted, the applied voltage of the DC / AC converter 122 of the second cylinder is quickly reduced.
  • step S308 When it is determined that the ignition command flag FLG for all the cylinders is “0”, the control device 8 shifts to the next operation in order to end the ignition operation (YES in step S308).
  • the ignition command flag FLG is “1” in any cylinder (NO in step S308), the ignition command flags FLG of all the cylinders become “0” according to the operation flow from step S306 to step S308. AC power is output to the spark plug of the corresponding cylinder.
  • the controller 8 causes the conduct second path by the second power cutoff device 7 (step S309).
  • the power supply capacitor 4 is charged by the output power of the DC / DC converter 5.
  • the control device 8 cuts off the first electric path of each cylinder by the first power cut-off device of each cylinder, the DC of the first cylinder is continued until an ignition command signal is input to any one of the cylinders next time. No voltage is applied to the / AC converter 121 and the second cylinder DC / AC converter 122.
  • the sequence operation from the timing t 61 to the timing t 76 is repeated for each ignition cycle T i1 of the first cylinder and each ignition cycle T i2 of the second cylinder. Since the ignition cycle and the current output period of the DC / AC converter vary depending on the operating conditions, they do not always coincide with all cylinders.
  • a typical ignition cycle is about 30 to 100 ms.
  • Power output period T ac1 and T ac2 typical DC / AC converter 121 and the DC / AC converter 122 are each about 100 [mu] s.
  • t 61 ′ and t 71 ′ are the timing of the ignition cycle of the next first cylinder and the timing of the ignition cycle of the next second cylinder, respectively.
  • an operation sequence having a period in which the ignition timings of the first cylinder and the second cylinder in FIG. 14B overlap will be described.
  • an instruction of the ignition operation start by the ignition command signal of the first cylinder is input to the control unit 8, the ignition command flag FLG1 the first cylinder to "1".
  • the control device 8 starts an ignition operation in the corresponding cylinder (step S301).
  • the control device 8 cuts off the second electric circuit by the second power cut-off device 7 (step S302).
  • the control device 8 causes the first electric circuit of the first cylinder to be conducted by the first power cut-off device 131 of the first cylinder (step S303). Electric power is supplied from the power supply capacitor 4 to the DC / AC converter 121 of the first cylinder.
  • DC / AC converter 121 in response to the ignition command flag FLG1, and outputs to the ignition plug 101 converts the DC power to AC power (step S304).
  • the DC / AC converter 121 outputs AC power to the spark plug 101 for a time Tac1 required for ignition. Thereby, an alternating high voltage is applied between the electrodes of the spark plug 101 to generate discharge plasma.
  • the fuel in the first cylinder of the internal combustion engine is ignited by discharge plasma. At this time, power is supplied to the DC / AC converter 121 from the power supply capacitor 4.
  • the ignition command flag FLG2 of the second cylinder in response to the ignition command signal of the second cylinder is changed to "1".
  • the control device 8 determines that the ignition command flag FLG2 of the cylinder in which the AC power output is stopped, that is, the second cylinder is “1”, and proceeds to the step of performing the ignition operation on the second cylinder. (YES in step S305).
  • the control device 8 causes the first power cut-off device 132 for the second cylinder to conduct the first electric circuit of the second cylinder ( Step S303). Electric power is supplied from the power supply capacitor 4 to the DC / AC converter 122 of the second cylinder.
  • DC / AC converter 122 of the second cylinder in response to the ignition command flag FLG2, and outputs the AC power to the spark plug 102 (step S304).
  • the DC / AC converter 122 outputs AC power to the spark plug 102 for a time Tac2 required for ignition. Thereby, an alternating high voltage is applied between the electrodes of the spark plug 102 to generate discharge plasma.
  • the fuel in the second cylinder of the internal combustion engine is ignited by discharge plasma.
  • power supply to the DC / AC converter 122 is also performed from the power supply capacitor 4.
  • step S306 a determination is made based on whether or not the period during which AC power is output in any cylinder is equal to or longer than the time Tac required for ignition. Therefore, if when determining the "AC power output period ⁇ T ac2 of the second cylinder" when the "AC power output period of the first cylinder ⁇ T ac1" is the next operation based on the determination of the second cylinder Transition.
  • the control device 8 stops the AC power output of the DC / AC converter 121, and the ignition command The flag FLG1 is changed to “0”.
  • Output stop of the DC / AC converter 121 of the timing t 86 i.e. at the timing t 87 after a predetermined time has elapsed since the ignition command flag FLG1 the first cylinder becomes "0”
  • the control unit 8 first power cutoff
  • the device 131 shuts off the first electric path of the first cylinder (step S307). When the first electric path of the first cylinder is interrupted, the applied voltage of the DC / AC converter 121 of the first cylinder is quickly reduced.
  • step S308 After changing the ignition command flag FLG1 for the first cylinder to “0”, the control device 8 determines whether or not the ignition command flags for all the cylinders are “0” (step S308). At timing t 87, since the ignition command flag FLG2 is "1" of the second cylinder (in step S308 NO), the spark plug 102 to an AC power output period of the second cylinder becomes time T ac2 required ignition Continue AC output.
  • the control unit 8 stops the AC power output of the DC / AC converter 122, an ignition command
  • the flag FLG2 is changed to “0”.
  • Output stop of the DC / AC converter 122 of the timing t 88, i.e. at a timing t 89 ignition command flag FLG2 is from "0" after a lapse of a predetermined time period of the second cylinder, the control unit 8 first power cutoff
  • the device 132 cuts off the first electric path of the second cylinder (step S307). When the first electric path of the second cylinder is interrupted, the applied voltage of the DC / AC converter 122 of the second cylinder is quickly reduced.
  • step S308 After changing the ignition command flag FLG2 for the second cylinder to “0”, the control device 8 determines whether or not the ignition command flags for all the cylinders are “0” (step S308). At timing t89 , the AC power output is stopped in all the cylinders, and the ignition command flag is “0” (YES in step S308), so the process proceeds to the next operation.
  • the controller 8 causes the conduct second path by the second power cutoff device 7 (step S309).
  • the power supply capacitor 4 is charged by the output power of the DC / DC converter 5.
  • the control device 8 cuts off the first electric path of each cylinder by the first power cut-off device of each cylinder, the DC of the first cylinder is continued until an ignition command signal is input to any one of the cylinders next time. No voltage is applied to the / AC converter 121 and the second cylinder DC / AC converter 122.
  • t 81 ′ and t 84 ′ are the timing of the ignition cycle of the next first cylinder and the timing of the ignition cycle of the next second cylinder, respectively.
  • the ignition device of the present embodiment can be applied to an internal combustion engine having more cylinders, and the same is achieved by increasing the first power cut-off device, the DC / AC converter, and the spark plug by one for each cylinder. Can be realized.
  • the DC power source 6, the second power cut-off device 7, the control device 8, the DC / DC conversion device 5, and the power supply capacitor 4 have a common configuration, and the first power cut-off device, the DC / DC
  • the first power cut-off device, the DC / DC By adopting a configuration in which one AC converter and one spark plug are provided for each cylinder, an increase in the size of the device can be suppressed.
  • a first power cut-off device is provided for each cylinder between the power supply capacitor 4 and the DC / AC converter for each cylinder, and the control device 8 generates an ignition command signal for each cylinder. Based on this, the conduction / cutoff of the first power cut-off device for each cylinder is controlled. More specifically, in the ignition device of the fourth embodiment, in response to the ignition command signal of each cylinder, the first power cut-off device for the cylinder during the period in which the DC / AC converter for the cylinder outputs AC power. The first electric circuit is turned on, and control is performed so that the first electric circuit is cut off by the first power cut-off device of the cylinder in a period in which the DC / AC converter stops AC power.
  • the period during which a high voltage is applied to the DC / AC converter for each cylinder can be shortened as compared with the third embodiment.
  • the probability of SEB occurring in the semiconductor element of the DC / AC converter is reduced compared to the third embodiment without using a large semiconductor element in the DC / AC converter. This contributes to the miniaturization of the ignition device.
  • the control device 8 in the ignition device includes the following as hardware for executing the function. That is, as a processing circuit, an arithmetic processing device (computer) 82 such as a CPU (Central Processing Unit), a storage device 83 for exchanging data with the arithmetic processing device 82, an input circuit 81 for inputting an external signal to the arithmetic processing device 82, And an output circuit 84 for outputting a signal from the arithmetic processing unit 82 to the outside.
  • arithmetic processing device such as a CPU (Central Processing Unit)
  • storage device 83 for exchanging data with the arithmetic processing device 82
  • an input circuit 81 for inputting an external signal to the arithmetic processing device 82
  • an output circuit 84 for outputting a signal from the arithmetic processing unit 82 to the outside.
  • the storage device 83 includes a RAM (Random Access Memory) configured to be able to read and write data from the arithmetic processing unit, a ROM (Read Only Memory) configured to be able to read data from the arithmetic processing unit 82, and the like. ing.
  • RAM Random Access Memory
  • ROM Read Only Memory

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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)

Abstract

Dans des dispositifs d'allumage utilisant une décharge de plasma produite par une alimentation en courant alternatif, il existe une possibilité de défaillance due à un claquage d'événement unique (SEB) du fait d'une exposition aux rayons cosmiques quand une haute tension continue est appliquée à un élément à semi-conducteurs pour une commande à haute fréquence, mais, cependant, l'utilisation d'un composant à forte résistance à la tension comme contre-mesure pose le problème de dispositifs d'allumage de taille surdimensionnée. A cet effet, la présente invention vise à traiter la nécessité d'effectuer une commande à l'encontre d'un état dans lequel une haute tension est appliquée au composant à semi-conducteurs et de réduire la taille du dispositif d'allumage. A cet effet, selon la présente invention, une trajectoire électrique dans ce dispositif d'allumage est interrompue pendant le temps où un dispositif de conversion c.c./c.a. (2) ne délivre pas en sortie une alimentation en courant alternatif à une bougie d'allumage (1), de manière à produire un temps pendant lequel aucune haute tension n'est appliquée à un élément à semi-conducteurs du dispositif de conversion c.c./c.a. (2).
PCT/JP2018/002622 2017-05-25 2018-01-29 Dispositif d'allumage et procédé de commande pour celui-ci WO2018216263A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6877660B1 (ja) * 2020-09-09 2021-05-26 三菱電機株式会社 電力変換装置及び電力変換装置を搭載した航空機

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001023700A (ja) * 1999-07-05 2001-01-26 Honda Motor Co Ltd バッテリ装置
US20150311680A1 (en) * 2014-04-29 2015-10-29 Federal-Mogul Ignition Company Distribution of corona igniter power signal
JP2016166535A (ja) * 2015-03-09 2016-09-15 三菱電機株式会社 内燃機関用点火装置
JP6246300B1 (ja) * 2016-11-14 2017-12-13 三菱電機株式会社 点火装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001023700A (ja) * 1999-07-05 2001-01-26 Honda Motor Co Ltd バッテリ装置
US20150311680A1 (en) * 2014-04-29 2015-10-29 Federal-Mogul Ignition Company Distribution of corona igniter power signal
JP2016166535A (ja) * 2015-03-09 2016-09-15 三菱電機株式会社 内燃機関用点火装置
JP6246300B1 (ja) * 2016-11-14 2017-12-13 三菱電機株式会社 点火装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6877660B1 (ja) * 2020-09-09 2021-05-26 三菱電機株式会社 電力変換装置及び電力変換装置を搭載した航空機
WO2022054155A1 (fr) * 2020-09-09 2022-03-17 三菱電機株式会社 Convertisseur de puissance et aéronef équipé d'un convertisseur de puissance
EP4213362A4 (fr) * 2020-09-09 2023-11-01 Mitsubishi Electric Corporation Convertisseur de puissance et aéronef équipé d'un convertisseur de puissance

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