WO2022064645A1 - Ignition device for internal combustion engine - Google Patents

Ignition device for internal combustion engine Download PDF

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Publication number
WO2022064645A1
WO2022064645A1 PCT/JP2020/036347 JP2020036347W WO2022064645A1 WO 2022064645 A1 WO2022064645 A1 WO 2022064645A1 JP 2020036347 W JP2020036347 W JP 2020036347W WO 2022064645 A1 WO2022064645 A1 WO 2022064645A1
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Prior art keywords
primary coil
sub
ignition
main
coil
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PCT/JP2020/036347
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French (fr)
Japanese (ja)
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義文 内勢
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日立Ａｓｔｅｍｏ阪神株式会社
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Priority to PCT/JP2020/036347 priority Critical patent/WO2022064645A1/en
Publication of WO2022064645A1 publication Critical patent/WO2022064645A1/en

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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

Definitions

  • the present invention relates to an ignition device for an internal combustion engine mounted on an automatic vehicle, and obtains good discharge characteristics by superimposing or continuously increasing the discharge energy generated on the secondary side of the ignition coil. ..
  • a high voltage of several kV generated on the secondary side of the primary current of the main primary ignition coil causes insulation breakage in the discharge gap of the spark plug.
  • the primary current of the sub-ignition coil connected in parallel with the main ignition coil is cut off, and the DC voltage of several kV generated on the secondary side is added.
  • the discharge current of the spark plug is determined by the combination of the triangular currents output from each coil. Therefore, in order to lengthen the high current period, there are two. It is necessary to increase the ignition phase of the ignition coils and to lengthen the time for accumulating sufficient energy in the two ignition coils. As described above, if the energization time to the primary coil is lengthened in addition to the use of the two ignition coils, there arises a problem that the size of the coil body is increased and the heat generation of the switching element that controls the energization of the primary coil is increased.
  • the present invention is an internal combustion engine capable of ensuring a stable high current period without lengthening the energization time of the primary coil, maintaining suitable combustion, and effectively suppressing heat generation of the ignition coil.
  • the purpose is to provide an ignition device for an engine.
  • a main primary coil in which the forward magnetic flux is increased by energization and the forward magnetic flux is reduced by interrupting the current is provided separately from the main primary coil, and the main primary coil is provided separately by energization.
  • the same forward magnetic flux as that of the main primary coil is generated, and the primary secondary coil in which the forward magnetic flux is reduced by interrupting the current, and at any timing after the forward magnetic flux is reduced.
  • An ignition coil having a secondary coil to which the generated magnetic flux acts to give discharge energy, a main switch means for switching energization / disconnection from the battery to the main primary coil, and the first sub-primary coil from the battery.
  • a first sub-switch means for switching energization / cutoff to the second sub-primary coil, a second sub-switch means for switching energization / cutoff to the second sub-primary coil, the main switch means, the first sub-switch means, and the second sub-switch means.
  • the ignition control means comprises an ignition control means that controls the switch means to generate a discharge spark in the ignition plug at a predetermined timing of the combustion cycle, and the ignition control means is the main primary coil and / or the first sub-primary coil.
  • Post-ignition superimposition discharge that superimposes and increases the discharge energy given to the secondary coil by energizing the second sub-primary coil for a predetermined superimposition time after the ignition timing when the energization to the secondary coil is cut off. It is characterized by enabling control.
  • the ignition control means controls the main switch means and the first sub switch means at the same timing to start energization of the main primary coil and to the first sub primary coil. Pre-ignition superimposed discharge control that starts energization at the same time may be possible.
  • the ignition control means controls the main switch means and the first sub switch means at individual timings to start energization of the main primary coil and to the first sub primary coil. Pre-ignition superimposed discharge control that starts energization individually may be possible.
  • the ignition control means has a normal discharge control for energizing and shutting off the main primary coil under the control of the main switch means, and the first sub-primary coil under the control of the first sub-switch means. It may be possible to perform alternate discharge control in which the auxiliary discharge control for energizing and shutting off the current is alternately performed.
  • the ignition device for an internal combustion engine having the above configuration, by performing post-ignition superimposed discharge control using the second secondary primary coil, necessary and sufficient discharge energy according to the operating conditions can be superimposed on the secondary coil.
  • a stable high current period can be ensured without lengthening the energization time of the primary coil and / or the primary secondary primary coil, and suitable combustion can be realized.
  • pre-ignition superimposition discharge control using both the main primary coil and the first sub-primary coil, necessary and sufficient discharge energy according to the operating conditions can be given to the secondary coil, so that the main primary coil and the first coil can be used.
  • a stable high current period can be secured without lengthening the energization time of the primary primary coil, and suitable combustion can be realized.
  • the excessive heat generation of the main primary coil and / or the first sub-primary coil is effective. It can be suppressed and the reliability of the device can be improved. Moreover, if some abnormality occurs in the main primary coil and it becomes unusable, the operation of the internal combustion engine can be continued by the alternative discharge control using the first secondary primary coil, so that the internal combustion engine becomes inoperable at worst. The state of can be avoided.
  • the waveforms of each part in the combustion cycle in which the pre-ignition superimposition discharge control (MAX) is performed and the combustion cycle in which the post-ignition superimposition discharge control is performed in addition to the pre-ignition superimposition discharge control (MAX) are schematically shown. It is a waveform diagram shown in.
  • FIG. 1 shows an ignition coil unit 1 for an internal combustion engine according to a first embodiment of the present invention, which includes an ignition coil unit 10 for generating a discharge spark in one spark plug 2 provided for each cylinder of the internal combustion engine. It is composed of an ECU 3 which is an internal combustion engine drive control device provided with an ignition control means 31 which outputs an ignition signal or the like indicating an operation timing of the ignition coil unit 10 at an appropriate timing, a DC power supply 4 such as a vehicle battery, and the like.
  • ECU 3 is an internal combustion engine drive control device provided with an ignition control means 31 which outputs an ignition signal or the like indicating an operation timing of the ignition coil unit 10 at an appropriate timing
  • a DC power supply 4 such as a vehicle battery, and the like.
  • the ignition control means 31 is included in the ECU 3 that comprehensively controls the internal combustion engine of the automobile, but the present invention is not limited to this.
  • an ignition control device or the like that receives an ignition signal generated by the ignition signal generation function of the normal ECU 3 and outputs an appropriate control signal to the ignition coil unit 10 may be separately provided.
  • the ignition coil unit 10 is a unit in which, for example, the ignition coil 11, the main switch means 12, the first sub switch means 13, the second sub switch means 14, and the like are housed in a case 15 having a required shape and integrated.
  • a high-voltage terminal 151 and a connector 152 are provided at appropriate positions in the case 15, and the spark plug 2 is connected via the high-voltage terminal 151, and the ECU 3, the DC power supply 4, and the grounding point GND are connected via the connector 152.
  • the ignition coil 11 includes a main primary coil 111a (for example, 90 turns), a first secondary primary coil 111b (for example, 90 turns), a second secondary primary coil 111c (for example, 60 turns), and a secondary coil 112 (for example, 9000 turns). Turn).
  • the ignition coil 11 causes the magnetic flux generated in the main primary coil 111a, the first sub-primary coil 111b, and the second sub-primary coil 111c to act on the secondary coil 112.
  • the main primary coil 11 surrounds the center core 113.
  • the coil 111a and the first and second secondary primary coils 111b and 111c are arranged, and the secondary coil 112 is further arranged outside the coil 111a.
  • the high voltage side which is one end of the main primary coil 111a, is connected to the DC power supply 4 via the connection terminal of the connector 152, and a power supply voltage VB + (for example, 12V) is applied.
  • the low voltage side which is the other end of the main primary coil 111a, is connected to the grounding point GND via the connection terminals of the main switch means 12 and the connector 152.
  • the high voltage side which is one end of the first secondary primary coil 111b, is connected to the DC power supply 4 via the connection terminal of the connector 152, and a power supply voltage VB + (for example, 12V) is applied.
  • the low-voltage side which is the other end of the first sub-primary coil 111b, is connected to the grounding point GND via the connection terminals of the first sub-switch means 13 and the connector 152.
  • the coil structure (wire diameter, turn diameter, pitch, number of turns, etc.) of the first secondary primary coil 111b is substantially the same as that of the main primary coil 111a.
  • the high voltage side which is one end of the second secondary primary coil 111c, is connected to the DC power supply 4 via the connection terminal of the connector 152, and a power supply voltage VB + (for example, 12V) is applied.
  • the low voltage side which is the other end of the second secondary primary coil 111c, is connected to the grounding point GND via the connection terminals of the second secondary switch means 14 and the connector 152.
  • the winding direction of the wire or the feeding direction to the wire so that the power supply generates a breaking magnetic flux in the direction opposite to the forward magnetic flux of the main primary coil 111a and the first secondary primary coil 111b. Is reversed from the main primary coil 111a and the first secondary primary coil 111b.
  • One end of the secondary coil 112 is connected to the spark plug 2 via the high voltage terminal 151, and the other end is connected to the grounding point GND via the connection terminal of the connector 152.
  • the main switch means 12 can be configured by using a semiconductor element that energizes / shuts off the main primary coil 111a, for example, an IGBT (Insulated Gate Bipolar Transistor).
  • the gate G which is the control terminal of the main switch means 12, is connected to the ECU 3 via the connection terminal of the connector 152, and is ON / OFF controlled by the main ignition signal Si1 generated by the ignition control means 31. That is, when the main switch means 12 is turned on, the main primary coil 111a is energized, and when the main switch means 12 is turned off, the energization to the main primary coil 111a is cut off.
  • the bypass line provided in parallel with the main switch means 12 is provided with a rectifying means in the forward direction from the grounding point GND side toward the ignition coil 11 side, and the voltage in the reverse direction is the collector of the main switch means 12. Prevents application between emitters.
  • the main switch means 12 when the main switch means 12 is turned on by the main ignition signal Si1 and the main primary coil 111a is energized, the main primary current I1a flows to increase the magnetic flux in the forward direction, and the main switch means 12 is turned on.
  • the main primary current I1a When the main primary current I1a is turned off and the main primary current I1a is cut off, the forward magnetic flux is sharply reduced (apparently, a breaking magnetic flux in the opposite direction to the forward magnetic flux is generated).
  • a high voltage is generated on the secondary coil 112 side so as to generate a magnetic field in a direction that hinders this change in magnetic flux, a discharge spark is generated between the discharge gaps of the spark plug 2, and a secondary current I2 flows.
  • the control of discharging the spark plug 2 by the energization / cutoff control of the main primary coil 111a is referred to as a normal discharge control.
  • the first sub switch means 13 can be configured by using a semiconductor element that energizes / shuts off the first sub primary coil 111b, for example, an IGBT.
  • the gate G which is the control terminal of the first sub-switch means 13, is connected to the ECU 3 via the connection terminal of the connector 152, and is ON / OFF controlled by the sub-ignition signal Si2 generated by the ignition control means 31. That is, when the first sub-switch means 13 is turned on, the energization of the first sub-primary coil 111b is performed, and when the first sub-switch means 13 is turned off, the energization of the first sub-primary coil 111b is cut off. Will be done.
  • the bypass line provided in parallel with the first sub-switch means 13 is provided with a rectifying means in the forward direction from the grounding point GND side toward the ignition coil 11 side, and the voltage in the reverse direction is the first sub-switch means. Prevents application between 13 collectors and emitters.
  • the sub-primary current I1b flows to increase the magnetic flux in the forward direction. 1
  • the forward magnetic flux is sharply reduced (apparently, a breaking magnetic flux in the opposite direction to the forward magnetic flux is generated).
  • a high voltage is generated on the secondary coil 112 side so as to generate a magnetic field in a direction that hinders this change in magnetic flux, a discharge spark is generated between the discharge gaps of the spark plug 2, and a secondary current I2 flows.
  • the control of discharging the spark plug 2 by the energization / cutoff control of the first sub-primary coil 111b is referred to as an alternative discharge control.
  • the second sub switch means 14 can be configured by using a semiconductor element that energizes / shuts off the second sub primary coil 111c, for example, an IGBT.
  • the gate G which is the control terminal of the second sub switch means 14, is connected to the ECU 3 via the connection terminal of the connector 152, and is ON / OFF controlled by the superimposed signal Sp generated by the ignition control means 31. That is, when the second sub-switch means 14 is turned on, the second sub-primary coil 111c is energized, and when the second sub-switch means 14 is turned off, the energization to the second sub-primary coil 111c is cut off. Will be done.
  • the second sub switch means 14 when the second sub switch means 14 is turned on by the superimposition signal Sp and the second sub primary coil 111c is energized, a superimposition magnetic flux in the same direction as the breaking magnetic flux is generated. Therefore, when the second sub-primary coil 111c is energized at an appropriate timing after ignition (after the timing when the energization to the main primary coil 111a and the first sub-primary coil 111b is cut off), the magnetic flux in the opposite direction ( A magnetic flux in the same direction as the magnetic flux that generated the high voltage on the secondary side) is generated, and it is possible to suppress the decrease in the secondary side electromotive force due to the attenuation of the secondary side magnetic field.
  • the secondary current I2 can be maintained high until the energization of the 111c is cut off. In this way, by performing energization / shutoff control for the second sub-primary coil 111c after ignition, the discharge energy given to the secondary coil 112 is superposedly increased and controlled. That is.
  • the first stage of FIG. 2 shows a combustion cycle in which normal discharge control is performed, and is a basic control in which discharge energy is given to the secondary coil 112 by using only the main primary coil 111a during one combustion cycle.
  • the main ignition signal Si1 is turned ON at a predetermined timing during the combustion cycle
  • the main switch means 12 is turned ON and the main primary current I1a flows.
  • the main primary current I1a increases until the saturation current is reached, and energy is accumulated in the main primary coil 111a.
  • FIG. 2 shows a combustion cycle in which superposition discharge control is performed after ignition after normal discharge control, and the second sub switch is performed after the ignition timing (after ignition) by energizing / shutting off the main primary coil 111a.
  • This is a control in which the means 14 is controlled to start energizing the second sub-primary coil 111c, and the secondary side is supplied with sufficient energy necessary to maintain the induced discharge from the second sub-primary coil 111c.
  • the main switch means 12 is turned on and the main primary current I1a flows. With the passage of time from the energization of the main primary coil 111a, the main primary current I1a increases until the saturation current is reached, and energy is accumulated in the main primary coil 111a. Then, when the main ignition signal Si1 is turned off at the ignition timing (when the signal level changes from H to L), an electromotive force corresponding to the energy stored in the main primary coil 111a is generated on the secondary side, and the secondary current I2 is generated. Along with the flow, dielectric breakdown occurs between the electrodes of the spark plug 2, and discharge sparks occur in the cylinder.
  • the ignition control means 31 turns on the superimposed signal Sp (for example, the signal level is changed from L to H) at an appropriate timing after the capacity discharge occurs in the spark plug 2 and the discharge current starts to flow.
  • the sub switch means 14 Turn on the sub switch means 14.
  • a superposed current I1c flows through the second sub primary coil 111c and gradually increases until the saturation current is reached, and the superposed magnetic flux in the same direction as the magnetic field generated in the secondary coil 112 also increases. It will increase. Therefore, the superimposed magnetic flux generated in the second secondary primary coil 111c acts on the secondary coil 112 so as to compensate for the decrease in the secondary current I2 due to the emission of electromagnetic energy of the secondary coil 112, and the secondary current I2 is high.
  • the current is maintained, and the high current period suitable for in-cylinder combustion can be efficiently extended. It is desirable that the superimposition time for continuing the energization of the second secondary primary coil 111c is set to a time equivalent to the maintenance period (high current period) of a high current necessary and sufficient for suitable in-cylinder combustion. ..
  • the ignition control means 31 turns off the superimposition signal Sp and turns off the second sub-switch means 14.
  • the superimposed current I1c does not flow in the second secondary primary coil 111c, and the superimposed magnetic flux by the second secondary primary coil 111c does not act on the secondary coil 112, so that the secondary current I2 also does not flow.
  • the ignition control means 31 performs post-ignition superimposed discharge control using the second secondary primary coil 111c, the discharge energy given to the secondary coil 112 without lengthening the ON time of the main ignition signal Si1 can be obtained. It can be increased to prolong the period during which the discharge current flowing between the electrodes of the spark plug 2 can be maintained at a high current. Moreover, the superimposed magnetic flux acting from the second secondary primary coil 111c to the secondary coil 112 is sufficient to generate and maintain a high current necessary and sufficient for optimally maintaining in-cylinder combustion. Therefore, the second secondary primary coil is sufficient. The energy required to energize the coil 111c can be kept low, which is effective in improving fuel efficiency.
  • the ignition control means 31 If the ignition control means 31 generates a superimposition signal Sp having an appropriate duty ratio so that the second sub-switch means 14 can be PWM-controlled, the superimposition current I1c to be passed through the second sub-primary coil 111c can be appropriately applied. Superimposition discharge control after ignition to increase or decrease is possible. In this way, if the ignition control means 31 arbitrarily controls the superimposed magnetic flux generated in the second secondary primary coil 111c so that appropriate discharge energy without excess or deficiency is given to the secondary side, further. Expected to improve fuel efficiency.
  • the first stage of FIG. 3 shows a combustion cycle in which alternative discharge control is performed, and is a control in which discharge energy is given to the secondary coil 112 by using only the first secondary primary coil 111b during one combustion cycle.
  • the main primary coil 111b uses a coil having the same structure as the main primary coil 111a, even in the alternative discharge control using the first sub-primary coil 111b instead of the main primary coil 111a, the main primary coil 111b is also used. Discharge energy equivalent to that of normal discharge control using the coil 111a can be applied to the secondary coil 112. Therefore, if some abnormality occurs in the main primary coil 111a and it becomes unusable, the operation of the internal combustion engine can be continued by the alternative discharge control using the first secondary primary coil 111b, so that the internal combustion engine cannot operate. You can avoid the worst situation.
  • FIG. 3 shows a combustion cycle in which the superimposed discharge control is performed after ignition after performing the alternative discharge control, and the second is after the ignition timing (after ignition) by energizing / shutting off the first sub-primary coil 111b.
  • This is a control in which the sub-switch means 14 is controlled to start energizing the second sub-primary coil 111c, and the secondary side is supplied with sufficient energy necessary to maintain the induced discharge from the second sub-primary coil 111c.
  • the secondary current I2 is maintained at a high current and in the cylinder as in the case where the post-ignition superimposition discharge control is performed after the normal discharge is performed.
  • the high current period suitable for combustion can be efficiently extended.
  • the first stage of FIG. 4 shows a combustion cycle in which pre-ignition superimposition discharge control is performed, and discharge energy is transferred to the secondary coil 112 by using both the main primary coil 111a and the first sub-primary coil 111b during one combustion cycle. It is the control given to. Since the pre-ignition superimposition discharge control shown in FIG. 4 maximizes the discharge energy given to the secondary side, it is referred to as pre-ignition superimposition discharge control (MAX) in the present specification.
  • MAX pre-ignition superimposition discharge control
  • the main switch means 12 and the first sub-switch means 13 are turned on at the same time. Therefore, the main primary current I1a and the secondary primary current I1b flow at the same time. With the passage of time from the start of energization of the main primary coil 111a and the first sub-primary coil 111b, the main primary current I1a and the sub-primary current I1b increase until the saturation current is reached, and the main primary coil 111a and the first sub are increased. Energy is stored in each of the primary coils 111b.
  • the electromotive force corresponds to the energy stored in the main primary coil 111a and the first sub-primary coil 111b. Electricity is generated on the secondary side, a secondary current I2 flows, and dielectric breakdown occurs between the electrodes of the spark plug 2, causing discharge sparks in the cylinder. Moreover, when the pre-ignition superimposition discharge control (MAX) is performed, a secondary current I2 larger than the secondary current I2 (shown by the alternate long and short dash line in the front stage of FIG. 4) flowing in the normal discharge control flows, so that the secondary current I2 flows. Is maintained at a high current, and the high current period suitable for in-cylinder combustion can be efficiently extended.
  • MAX pre-ignition superimposition discharge control
  • the ignition control means 31 performs pre-ignition superimposition discharge control (MAX) using the main primary coil 111a and the first sub-primary coil 111b, the secondary coil 112 without lengthening the ON time of the main ignition signal Si1. It is possible to increase the discharge energy given to the spark plug 2 and prolong the period during which the discharge current flowing between the electrodes of the spark plug 2 can be maintained at a high current.
  • MAX pre-ignition superimposition discharge control
  • FIG. 4 shows a combustion cycle in which pre-ignition superimposition discharge control (MAX) is performed and then post-ignition superimposition discharge control is performed.
  • the ignition control means 31 controls the second sub-switch means 14 after the ignition timing (after ignition) by energizing / shutting off the main primary coil 111a and the first sub-primary coil 111b, and the second sub-primary.
  • the energization of the coil 111c is started, and the secondary side is provided with sufficient energy necessary to maintain the induced discharge from the second secondary primary coil 111c.
  • the post-ignition superimposition discharge control When the post-ignition superimposition discharge control is performed after the pre-ignition superimposition discharge control (MAX) is performed, it is larger than the secondary current I2 (shown by the two-point chain line in the latter part of FIG. 4) flowing in the pre-ignition superimposition discharge control (MAX). Since the secondary current I2 flows, the secondary current I2 is maintained at a higher current, and the high current period suitable for in-cylinder combustion can be efficiently extended.
  • pre-ignition superimposition discharge control MAX
  • post-ignition superimposition discharge control it can be applied to engine ignition by ultra-lean combustion super lean burn, but energy is supplied to the secondary side. Is excessive, and there is a concern that fuel efficiency will deteriorate. Therefore, if the pre-ignition superimposition discharge control that does not maximize the discharge energy given to the secondary side and keeps it to a necessary and sufficient level can be performed, the deterioration of fuel efficiency can be suppressed.
  • the first stage of FIG. 5 shows a combustion cycle in which the discharge energy given to the secondary side is increased by about 50% from that in the normal discharge control to perform the optimized pre-ignition superposed discharge control. This is referred to herein as pre-ignition superimposed discharge control (50% increase).
  • the main switch means 12 is turned ON and the main primary current I1a flows.
  • the main primary current I1a increases until the saturation current is reached, and energy is accumulated in the main primary coil 111a.
  • the sub-ignition signal Si2 is turned ON (the signal level changes from L to H) at the timing when a predetermined delay time dt has elapsed since the main ignition signal Si1 is turned ON, and the first sub-switch means 13 is turned ON.
  • the secondary primary current I1b begins to flow. With the passage of time from the start of energization of the first secondary primary coil 111b, the secondary primary current I1b increases until the saturation current is reached, and energy is also stored in the first secondary primary coil 111b.
  • the electromotive force corresponds to the energy stored in the main primary coil 111a and the first sub-primary coil 111b. Electricity is generated on the secondary side, a secondary current I2 flows, and dielectric breakdown occurs between the electrodes of the spark plug 2, causing discharge sparks in the cylinder.
  • the energization time of the first secondary primary coil 111b is short by the delay time dt, the energy stored in the first secondary primary coil 111b is suppressed to about half of the energy stored in the main primary coil 111a.
  • the pre-ignition superimposition discharge control (50% increase) is performed, it is larger than the secondary current I2 (shown by the alternate long and short dash line in the previous stage of FIG. 5) flowing in the normal discharge control, but the pre-ignition superimposition discharge control (MAX). It is possible to pass a secondary current I2 that is suppressed more than that. That is, if the pre-ignition superimposition discharge control (50% increase) is performed, the secondary current I2 can be maintained at a necessary and sufficient high current while suppressing the deterioration of fuel efficiency, so that the high current period suitable for in-cylinder combustion is efficient. It can be extended well.
  • the energy stored in the first sub primary coil 111b is 0% by appropriately setting the delay time dt. Since it can be adjusted up to 100%, pre-ignition superimposed discharge control can be performed with a necessary and sufficient arbitrary increase. Therefore, if the ignition control means 31 performs post-ignition superimposed discharge control (arbitrary increase), the discharge energy given to the secondary coil 112 is increased without lengthening the ON time of the main ignition signal Si1, and the electrode of the spark plug 2 is increased. The period during which the discharge current flowing between them can be maintained at a high current can be extended, and the deterioration of fuel efficiency can be suppressed.
  • FIG. 5 shows a combustion cycle in which pre-ignition superimposition discharge control (50% increase) is performed and then post-ignition superimposition discharge control is performed.
  • the ignition control means 31 controls the second sub-switch means 14 after the ignition timing (after ignition) by energizing / shutting off the main primary coil 111a and the first sub-primary coil 111b, and the second sub-primary.
  • the energization of the coil 111c is started, and the secondary side is provided with sufficient energy necessary to maintain the induced discharge from the second secondary primary coil 111c.
  • the secondary current I2 (shown by a two-point chain line in the latter part of FIG. 5) flowing under the pre-ignition superimposition discharge control (50% increase) is shown. ), Since the secondary current I2 flows, the secondary current I2 is maintained at a higher current, and the high current period suitable for in-cylinder combustion can be efficiently extended.
  • Various discharge controls performed by supplying the main ignition signal Si1, the sub-ignition signal Si2, and the superimposed signal Sp generated by the ignition control means 31 to the ignition coil unit 10 are for controlling to increase the discharge energy given to the secondary coil 112. Not limited.
  • the first stage of FIG. 6 shows a combustion cycle in which the main primary coil 111a is energized and cut off by the main ignition signal Si1 and normal discharge control is performed to give discharge energy to the secondary side.
  • the latter part of FIG. 6 shows a combustion cycle in which the primary sub-primary coil 111b is energized and cut off by the sub-ignition signal Si2, and alternative discharge control is performed to give discharge energy to the secondary side.
  • the ignition control means 31 is changed to the alternating discharge control in which the combustion cycle in which the normal discharge control is performed and the combustion cycle in which the alternative discharge control is performed are alternately performed, the main primary coil 111a and the first sub-primary coil 111b are reached. Since the frequency of energization of the main coil 111a is halved, the heat generation of the main primary coil 111a and the first secondary primary coil 111b can be suppressed.
  • the main primary coil 111a when excessive heat generation of the main primary coil 111a is detected, it is possible to stop the normal discharge control by the main primary coil 111a and switch to the alternative discharge control by the first secondary primary coil 111b. There is a risk that excessive heat generation will also occur in the first secondary primary coil 111b.
  • the alternate discharge control when the excessive heat generation of the main primary coil 111a is detected, if the alternate discharge control is performed, the heat dissipation of the main primary coil 111a can be promoted and the excessive temperature rise of the first secondary primary coil 111b can be suppressed. Stable ignition control can be continued for a long period of time, and the reliability of the ignition device 1 for an internal combustion engine can be enhanced.
  • the alternate discharge control by the ignition control means 31 it is also possible to use the post-ignition superimposition discharge control using the second secondary primary coil 111c together.
  • alternate discharge control using post-ignition superposition discharge control is performed. It is valid.
  • Ignition device for internal combustion engine 10 Ignition coil unit 11 Ignition coil 111a Main primary coil 111b 1st sub primary coil 111c 2nd sub primary coil 112 Secondary coil 12 Main switch means 13 1st sub switch means 14 2nd sub switch means 2 Spark plug 3 ECU 31 Ignition control means 4 DC power supply

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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

The present invention ensures a high-current period with a spark plug being stable without increasing a time for energizing a primary coil.　An ignition coil 11 is formed of: a main primary coil 111a and a first auxiliary primary coil 111b which generate a magnetic flux in the forward direction by being energized; a second auxiliary primary coil 111c which generates a superimposed magnetic flux in the reverse direction by being energized; and a secondary coil 112 to receive an action by the magnetic fluxes from the main primary coil 111a and the first and second auxiliary primary coils 111b and 111c. Pre-ignition superimposed discharge control performed by the main primary coil 111a and the first auxiliary primary coil 111b and post-ignition superimposed discharge control performed by the second auxiliary primary coil 111c are used in combination to ensure a high-current period with a spark plug 2 being stable.

Description

内燃機関用点火装置Ignition system for internal combustion engine
　本発明は、自動車両に搭載される内燃機関用点火装置に関し、点火コイルの二次側に発生させる放電エネルギを重畳的に増大或いは連続的に増大させて、良好な放電特性を得るものである。 INDUSTRIAL APPLICABILITY The present invention relates to an ignition device for an internal combustion engine mounted on an automatic vehicle, and obtains good discharge characteristics by superimposing or continuously increasing the discharge energy generated on the secondary side of the ignition coil. ..
　車両搭載の内燃機関として、燃費改善のために直噴エンジンや高ＥＧＲ（希釈燃焼）エンジンまたは、燃料に対する空気の比率を高めた希薄燃焼（超希薄燃焼スーパーリーンバーン：ＳＩＰ革新的燃焼技術）が採用検討されているが、これらのエンジンは着火性があまり良くないため、点火装置には高エネルギ型のものが必要になる。そこで、古典的な電流遮断原理により発生する点火コイル二次側出力に、さらにもう一つの点火コイルの出力を加算的に重畳する位相放電型の点火装置が提案されている（例えば、特許文献１を参照）。 As an internal combustion engine mounted on a vehicle, a direct injection engine, a high EGR (diluted combustion) engine, or lean combustion (ultra-lean combustion super lean burn: SIP innovative combustion technology) with an increased ratio of air to fuel is used to improve fuel efficiency. Although it is being considered for adoption, these engines are not very ignitable, so a high-energy type ignition device is required. Therefore, a phase discharge type ignition device has been proposed in which the output of another ignition coil is additively superimposed on the secondary side output of the ignition coil generated by the classical current cutoff principle (for example, Patent Document 1). See).
　この特許文献１に記載の点火装置によれば、主一次点火コイルの一次電流を遮断することでその二次側に発生する数ｋＶの高電圧により、点火プラグの放電間隙に絶縁破壊を起こして点火コイルの二次側から放電電流を流し始めた後に、主点火コイルと並列に接続された副点火コイルの一次電流を遮断し、その二次側に発生する数ｋＶの直流電圧を加算的に重畳することで、比較的長い時間に亙って点火プラグに大きな放電エネルギを与えることができるため、燃料への着火性が向上し、延いては燃費も向上する。 According to the ignition device described in Patent Document 1, a high voltage of several kV generated on the secondary side of the primary current of the main primary ignition coil causes insulation breakage in the discharge gap of the spark plug. After starting to flow the discharge current from the secondary side of the ignition coil, the primary current of the sub-ignition coil connected in parallel with the main ignition coil is cut off, and the DC voltage of several kV generated on the secondary side is added. By superimposing them, a large amount of discharge energy can be given to the spark plug over a relatively long time, so that the ignitability of the fuel is improved and the fuel efficiency is also improved.
特開２０１２－１４０９２４号公報Japanese Unexamined Patent Publication No. 2012-140924
　しかしながら、特許文献１に記載された点火装置のような方式では、点火プラグの放電電流が各コイルから出力される三角形の電流の組み合わせで決まるため、高電流期間を長くするためには、２つの点火コイルの点火位相を大きくしたうえで、２つの点火コイルに十分なエネルギを蓄積する時間を長くする必要がある。このように、２つの点火コイルを用いることに加えて一次コイルへの通電時間を長くすると、コイル本体の大型化及び一次コイルへの通電制御を行うスイッチング素子の発熱が高くなるという問題が生ずる。 However, in a method such as the ignition device described in Patent Document 1, the discharge current of the spark plug is determined by the combination of the triangular currents output from each coil. Therefore, in order to lengthen the high current period, there are two. It is necessary to increase the ignition phase of the ignition coils and to lengthen the time for accumulating sufficient energy in the two ignition coils. As described above, if the energization time to the primary coil is lengthened in addition to the use of the two ignition coils, there arises a problem that the size of the coil body is increased and the heat generation of the switching element that controls the energization of the primary coil is increased.
　また、点火コイルの外部あるいは内部で電源電圧を昇圧してコイルの二次側に直接的に高電圧を印加することで、一次コイルへの通電時間を長くすることなく、二次側の放電エネルギを高める方法も考えられる。しかしながら、このような方法では、電源電圧を数ｋＶ程度に昇圧させる必要があるので、搭載する昇圧回路の高耐圧化および高電圧での接続耐性が必要となり、相当なコストアップとなってしまう。 In addition, by boosting the power supply voltage outside or inside the ignition coil and applying a high voltage directly to the secondary side of the coil, the discharge energy on the secondary side does not lengthen the energization time of the primary coil. There is also a way to increase the voltage. However, in such a method, since it is necessary to boost the power supply voltage to about several kV, it is necessary to increase the withstand voltage of the mounted booster circuit and to withstand the connection at a high voltage, resulting in a considerable cost increase.
　加えて、内燃機関の高回転時には、二次側へ与える高エネルギを維持できるよう、点火装置に高出力が要求されるため、点火コイル自身に過剰な発熱が生ずる危険性がある。点火コイルの発熱を抑制できないまま過負荷の状態が続くと、コイル焼損といった装置故障が懸念され、点火装置の信頼性を損なうこととなる。したがって、点火コイルの発熱抑制を行えれば、点火装置自体の信頼性を高めることができる。 In addition, when the internal combustion engine rotates at a high speed, a high output is required for the ignition device so that the high energy given to the secondary side can be maintained, so that there is a risk that excessive heat generation will occur in the ignition coil itself. If the overload state continues without suppressing the heat generation of the ignition coil, there is a concern about device failure such as coil burnout, and the reliability of the ignition device is impaired. Therefore, if the heat generation of the ignition coil can be suppressed, the reliability of the ignition device itself can be improved.
　そこで、本発明は、一次コイルへの通電時間を長くすることなく安定した高電流期間を確保して、好適な燃焼を維持することができ、しかも、点火コイルの発熱を効果的に抑制できる内燃機関用点火装置の提供を目的とする。 Therefore, the present invention is an internal combustion engine capable of ensuring a stable high current period without lengthening the energization time of the primary coil, maintaining suitable combustion, and effectively suppressing heat generation of the ignition coil. The purpose is to provide an ignition device for an engine.
　上記課題を解決するために、通電により順方向の磁束が増加し、電流を遮断することにより順方向の磁束が減ぜられる主一次コイルと、前記主一次コイルとは別に設けられ、通電により前記主一次コイルと同じ順方向の磁束が生じ、電流を遮断することにより前記順方向の磁束が減ぜられる第１副一次コイルと、前記順方向の磁束が減ぜられた以降の任意のタイミングで通電することにより順方向磁束と逆方向の重畳磁束を生じさせる第２副一次コイルと、一端側が点火プラグと接続され、前記主一次コイル、前記第１副一次コイルおよび前記第２副一次コイルに生じた磁束が作用して放電エネルギが与えられる二次コイルと、を有する点火コイルと、バッテリから前記主一次コイルへの通電・遮断を切り替える主スイッチ手段と、前記バッテリから前記第１副一次コイルへの通電・遮断を切り替える第１副スイッチ手段と、前記第２副一次コイルへの通電・遮断を切り替える第２副スイッチ手段と、前記主スイッチ手段、前記第１副スイッチ手段および前記第２副スイッチ手段を制御して、燃焼サイクルの所定のタイミングで前記点火プラグに放電火花を発生させる点火制御手段と、を備え、前記点火制御手段は、前記主一次コイルおよび／または前記第１副一次コイルへの通電を遮断した点火タイミング以降に、所定の重畳時間だけ前記第２副一次コイルへの通電を行うことで、前記二次コイルに与えられる前記放電エネルギを重畳的に増加させる点火後重畳放電制御を可能としたことを特徴とする。 In order to solve the above problems, a main primary coil in which the forward magnetic flux is increased by energization and the forward magnetic flux is reduced by interrupting the current is provided separately from the main primary coil, and the main primary coil is provided separately by energization. The same forward magnetic flux as that of the main primary coil is generated, and the primary secondary coil in which the forward magnetic flux is reduced by interrupting the current, and at any timing after the forward magnetic flux is reduced. A second sub-primary coil that generates a superposed magnetic flux in the opposite direction to the forward magnetic flux when energized, and one end side connected to the ignition plug to the main primary coil, the first sub-primary coil, and the second sub-primary coil. An ignition coil having a secondary coil to which the generated magnetic flux acts to give discharge energy, a main switch means for switching energization / disconnection from the battery to the main primary coil, and the first sub-primary coil from the battery. A first sub-switch means for switching energization / cutoff to the second sub-primary coil, a second sub-switch means for switching energization / cutoff to the second sub-primary coil, the main switch means, the first sub-switch means, and the second sub-switch means. The ignition control means comprises an ignition control means that controls the switch means to generate a discharge spark in the ignition plug at a predetermined timing of the combustion cycle, and the ignition control means is the main primary coil and / or the first sub-primary coil. Post-ignition superimposition discharge that superimposes and increases the discharge energy given to the secondary coil by energizing the second sub-primary coil for a predetermined superimposition time after the ignition timing when the energization to the secondary coil is cut off. It is characterized by enabling control.
　また、上記構成において、前記点火制御手段は、前記主スイッチ手段と前記第１副スイッチ手段とを同じタイミングで制御することにより、前記主一次コイルへの通電開始と前記第１副一次コイルへの通電開始を同時に行う点火前重畳放電制御を可能としてもよい。 Further, in the above configuration, the ignition control means controls the main switch means and the first sub switch means at the same timing to start energization of the main primary coil and to the first sub primary coil. Pre-ignition superimposed discharge control that starts energization at the same time may be possible.
　また、上記構成において、前記点火制御手段は、前記主スイッチ手段と前記第１副スイッチ手段を個別のタイミングで制御することにより、前記主一次コイルへの通電開始と前記第１副一次コイルへの通電開始を個別に行う点火前重畳放電制御を可能としてもよい。 Further, in the above configuration, the ignition control means controls the main switch means and the first sub switch means at individual timings to start energization of the main primary coil and to the first sub primary coil. Pre-ignition superimposed discharge control that starts energization individually may be possible.
　また、上記構成において、前記点火制御手段は、前記主スイッチ手段の制御によって前記主一次コイルへの通電・遮断を行う通常放電制御と、前記第１副スイッチ手段の制御によって前記第１副一次コイルへの通電・遮断を行う副放電制御とを、交互に行う交互放電制御を可能としてもよい。 Further, in the above configuration, the ignition control means has a normal discharge control for energizing and shutting off the main primary coil under the control of the main switch means, and the first sub-primary coil under the control of the first sub-switch means. It may be possible to perform alternate discharge control in which the auxiliary discharge control for energizing and shutting off the current is alternately performed.
　上記構成の内燃機関用点火装置によれば、第２副一次コイルを用いた点火後重畳放電制御を行うことにより、運転条件に応じた必要十分な放電エネルギを二次コイルへ重畳できるので、主一次コイルおよび／または第１副一次コイルへの通電時間を長くすることなく安定した高電流期間を確保し、好適な燃焼を実現できる。また、主一次コイルと第１副一次コイルの両方を用いた点火前重畳放電制御を行うことにより、運転条件に応じた必要十分な放電エネルギを二次コイルへ与えられるので、主一次コイルおよび第１副一次コイルへの通電時間を長くすることなく安定した高電流期間を確保し、好適な燃焼を実現できる。さらに、主一次コイルによる通常放電制御と第１副一次コイルによる副放電制御とを交互に行う交互放電制御に変更すれば、主一次コイルおよび／または第１副一次コイルの過剰な発熱を効果的に抑制でき、装置としての信頼性を高めることができる。しかも、主一次コイルに何らかの異常が生じて使用不可能となった場合には、第１副一次コイルを用いた代替放電制御によって内燃機関の運転を継続できるので、内燃機関が動作不能となる最悪の状態を回避できる。 According to the ignition device for an internal combustion engine having the above configuration, by performing post-ignition superimposed discharge control using the second secondary primary coil, necessary and sufficient discharge energy according to the operating conditions can be superimposed on the secondary coil. A stable high current period can be ensured without lengthening the energization time of the primary coil and / or the primary secondary primary coil, and suitable combustion can be realized. Further, by performing pre-ignition superimposition discharge control using both the main primary coil and the first sub-primary coil, necessary and sufficient discharge energy according to the operating conditions can be given to the secondary coil, so that the main primary coil and the first coil can be used. A stable high current period can be secured without lengthening the energization time of the primary primary coil, and suitable combustion can be realized. Furthermore, if the normal discharge control by the main primary coil and the sub-discharge control by the first sub-primary coil are changed to the alternate discharge control, the excessive heat generation of the main primary coil and / or the first sub-primary coil is effective. It can be suppressed and the reliability of the device can be improved. Moreover, if some abnormality occurs in the main primary coil and it becomes unusable, the operation of the internal combustion engine can be continued by the alternative discharge control using the first secondary primary coil, so that the internal combustion engine becomes inoperable at worst. The state of can be avoided.
本発明に係る内燃機関用点火装置の実施形態を示す概略構成図である。It is a schematic block diagram which shows the embodiment of the ignition device for an internal combustion engine which concerns on this invention. 本実施形態に係る内燃機関用点火装置において通常放電制御を行う燃焼サイクルと通常放電制御に加えて点火後重畳放電制御を行う燃焼サイクルにおける各部波形を模式的に示した波形図である。It is a waveform diagram schematically showing the waveforms of each part in the combustion cycle in which the normal discharge control is performed and the combustion cycle in which the superposed discharge control is performed after ignition in addition to the normal discharge control in the ignition device for an internal combustion engine according to the present embodiment. 本実施形態に係る内燃機関用点火装置において代替放電制御を行う燃焼サイクルと代替放電制御に加えて点火後重畳放電制御を行う燃焼サイクルにおける各部波形を模式的に示した波形図である。It is a waveform diagram schematically showing the waveforms of each part in the combustion cycle in which alternative discharge control is performed and the combustion cycle in which superposition discharge control is performed after ignition in addition to the alternative discharge control in the ignition device for an internal combustion engine according to the present embodiment. 本実施形態に係る内燃機関用点火装置において点火前重畳放電制御（ＭＡＸ）を行う燃焼サイクルと点火前重畳放電制御（ＭＡＸ）に加えて点火後重畳放電制御を行う燃焼サイクルにおける各部波形を模式的に示した波形図である。In the ignition device for an internal combustion engine according to the present embodiment, the waveforms of each part in the combustion cycle in which the pre-ignition superimposition discharge control (MAX) is performed and the combustion cycle in which the post-ignition superimposition discharge control is performed in addition to the pre-ignition superimposition discharge control (MAX) are schematically shown. It is a waveform diagram shown in. 本実施形態に係る内燃機関用点火装置において点火前重畳放電制御（５０％増）を行う燃焼サイクルと点火前重畳放電制御（５０％増）に加えて点火後重畳放電制御を行う燃焼サイクルにおける各部波形を模式的に示した波形図である。Each part of the combustion cycle for performing pre-ignition superimposition discharge control (50% increase) and the combustion cycle for pre-ignition superimposition discharge control (50% increase) in addition to the pre-ignition superimposition discharge control (50% increase) in the ignition device for an internal combustion engine according to the present embodiment. It is a waveform diagram which shows the waveform schematically. 本実施形態に係る内燃機関用点火装置において通常放電制御を行う燃焼サイクルと副放電制御を行う燃焼サイクルとを交互に行う交互放電制御での各燃焼サイクルにおける各部波形を模式的に示した波形図である。A waveform diagram schematically showing the waveforms of each part in each combustion cycle in the alternating discharge control in which the combustion cycle in which the normal discharge control is performed and the combustion cycle in which the sub-discharge control is performed alternately in the ignition device for an internal combustion engine according to the present embodiment. Is.
　次に、本発明に係る内燃機関用点火装置の実施形態を、添付図面に基づいて詳細に説明する。 Next, an embodiment of the ignition device for an internal combustion engine according to the present invention will be described in detail with reference to the attached drawings.
　図１に示すのは、本発明の第１実施形態に係る内燃機関用点火装置１であり、内燃機関の気筒毎に設けられる１つの点火プラグ２に放電火花を発生させる点火コイルユニット１０と、この点火コイルユニット１０の動作タイミングを指示する点火信号等を適宜なタイミングで出力する点火制御手段３１を備えた内燃機関駆動制御装置であるＥＣＵ３、車両バッテリ等の直流電源４等で構成される。 FIG. 1 shows an ignition coil unit 1 for an internal combustion engine according to a first embodiment of the present invention, which includes an ignition coil unit 10 for generating a discharge spark in one spark plug 2 provided for each cylinder of the internal combustion engine. It is composed of an ECU 3 which is an internal combustion engine drive control device provided with an ignition control means 31 which outputs an ignition signal or the like indicating an operation timing of the ignition coil unit 10 at an appropriate timing, a DC power supply 4 such as a vehicle battery, and the like.
　なお、本実施形態に示す内燃機関用点火装置１においては、点火制御手段３１が、自動車の内燃機関を統括的に制御するＥＣＵ３に含まれるものとしたが、これに限定されるものではない。例えば、通常のＥＣＵ３が有している点火信号生成機能によって生成された点火信号を受けて、適宜な制御信号を点火コイルユニット１０へ出力する点火制御装置等を別途設けるようにしても構わない。 In the internal combustion engine ignition device 1 shown in the present embodiment, the ignition control means 31 is included in the ECU 3 that comprehensively controls the internal combustion engine of the automobile, but the present invention is not limited to this. For example, an ignition control device or the like that receives an ignition signal generated by the ignition signal generation function of the normal ECU 3 and outputs an appropriate control signal to the ignition coil unit 10 may be separately provided.
　上記点火コイルユニット１０は、例えば、点火コイル１１、主スイッチ手段１２、第１副スイッチ手段１３、第２副スイッチ手段１４等を所要形状のケース１５に収納して一体構造としたユニットである。このケース１５の適所には、高圧端子１５１とコネクタ１５２が設けられ、高圧端子１５１を介して点火プラグ２を接続すると共に、コネクタ１５２を介してＥＣＵ３、直流電源４および接地点ＧＮＤと接続する。 The ignition coil unit 10 is a unit in which, for example, the ignition coil 11, the main switch means 12, the first sub switch means 13, the second sub switch means 14, and the like are housed in a case 15 having a required shape and integrated. A high-voltage terminal 151 and a connector 152 are provided at appropriate positions in the case 15, and the spark plug 2 is connected via the high-voltage terminal 151, and the ECU 3, the DC power supply 4, and the grounding point GND are connected via the connector 152.
　点火コイル１１は、主一次コイル１１１ａ（例えば、９０ターン）と第１副一次コイル１１１ｂ（例えば、９０ターン）と第２副一次コイル１１１ｃ（例えば、６０ターン）と二次コイル１１２（例えば、９０００ターン）を備える。なお、点火コイル１１は、主一次コイル１１１ａと第１副一次コイル１１１ｂと第２副一次コイル１１１ｃに生ずる磁束を二次コイル１１２に作用させるもので、例えば、センターコア１１３を取り巻くように主一次コイル１１１ａおよび第１，第２副一次コイル１１１ｂ，１１１ｃを配置し、更にその外側に二次コイル１１２を配置する。 The ignition coil 11 includes a main primary coil 111a (for example, 90 turns), a first secondary primary coil 111b (for example, 90 turns), a second secondary primary coil 111c (for example, 60 turns), and a secondary coil 112 (for example, 9000 turns). Turn). The ignition coil 11 causes the magnetic flux generated in the main primary coil 111a, the first sub-primary coil 111b, and the second sub-primary coil 111c to act on the secondary coil 112. For example, the main primary coil 11 surrounds the center core 113. The coil 111a and the first and second secondary primary coils 111b and 111c are arranged, and the secondary coil 112 is further arranged outside the coil 111a.
　主一次コイル１１１ａの一方端である高圧側は、コネクタ１５２の接続端子を介して直流電源４と接続され、電源電圧ＶＢ＋（例えば、１２Ｖ）が印加される。主一次コイル１１１ａの他方端である低圧側は、主スイッチ手段１２およびコネクタ１５２の接続端子を介して接地点ＧＮＤに接続される。 The high voltage side, which is one end of the main primary coil 111a, is connected to the DC power supply 4 via the connection terminal of the connector 152, and a power supply voltage VB + (for example, 12V) is applied. The low voltage side, which is the other end of the main primary coil 111a, is connected to the grounding point GND via the connection terminals of the main switch means 12 and the connector 152.
　第１副一次コイル１１１ｂの一方端である高圧側は、コネクタ１５２の接続端子を介して直流電源４と接続され、電源電圧ＶＢ＋（例えば、１２Ｖ）が印加される。第１副一次コイル１１１ｂの他方端である低圧側は、第１副スイッチ手段１３およびコネクタ１５２の接続端子を介して接地点ＧＮＤに接続される。なお、第１副一次コイル１１１ｂのコイル構造（線径、ターン径、ピッチ、ターン数など）は、主一次コイル１１１ａとほぼ等しくしてある。 The high voltage side, which is one end of the first secondary primary coil 111b, is connected to the DC power supply 4 via the connection terminal of the connector 152, and a power supply voltage VB + (for example, 12V) is applied. The low-voltage side, which is the other end of the first sub-primary coil 111b, is connected to the grounding point GND via the connection terminals of the first sub-switch means 13 and the connector 152. The coil structure (wire diameter, turn diameter, pitch, number of turns, etc.) of the first secondary primary coil 111b is substantially the same as that of the main primary coil 111a.
　第２副一次コイル１１１ｃの一方端である高圧側は、コネクタ１５２の接続端子を介して直流電源４と接続され、電源電圧ＶＢ＋（例えば、１２Ｖ）が印加される。第２副一次コイル１１１ｃの他方端である低圧側は、第２副スイッチ手段１４およびコネクタ１５２の接続端子を介して接地点ＧＮＤに接続される。なお、第２副一次コイル１１１ｃは、給電によって、主一次コイル１１１ａおよび第１副一次コイル１１１ｂの順方向磁束と逆方向の遮断磁束が生じるように、線材の巻回方向あるいは線材への給電方向を主一次コイル１１１ａおよび第１副一次コイル１１１ｂと反対にしておく。 The high voltage side, which is one end of the second secondary primary coil 111c, is connected to the DC power supply 4 via the connection terminal of the connector 152, and a power supply voltage VB + (for example, 12V) is applied. The low voltage side, which is the other end of the second secondary primary coil 111c, is connected to the grounding point GND via the connection terminals of the second secondary switch means 14 and the connector 152. In the second secondary primary coil 111c, the winding direction of the wire or the feeding direction to the wire so that the power supply generates a breaking magnetic flux in the direction opposite to the forward magnetic flux of the main primary coil 111a and the first secondary primary coil 111b. Is reversed from the main primary coil 111a and the first secondary primary coil 111b.
　二次コイル１１２は、一方端が高圧端子１５１を介して点火プラグ２に接続され、他方端はコネクタ１５２の接続端子を介して接地点ＧＮＤに接続される。 One end of the secondary coil 112 is connected to the spark plug 2 via the high voltage terminal 151, and the other end is connected to the grounding point GND via the connection terminal of the connector 152.
　主スイッチ手段１２は、主一次コイル１１１ａへの通電・遮断を行う半導体素子、例えば、ＩＧＢＴ（Insulated Gate Bipolar Transistor:絶縁ゲートバイポーラトランジスタ）を用いて構成できる。主スイッチ手段１２の制御端子であるゲートＧは、コネクタ１５２の接続端子を介してＥＣＵ３に接続され、点火制御手段３１が生成する主点火信号Ｓｉ１によってＯＮ・ＯＦＦ制御される。すなわち、主スイッチ手段１２がＯＮになることで主一次コイル１１１ａへの通電が行われ、主スイッチ手段１２がＯＦＦになることで主一次コイル１１１ａへの通電が遮断される。なお、主スイッチ手段１２と並列に設けられたバイパス線路には、接地点ＧＮＤ側から点火コイル１１側に向かって順方向となる整流手段を設け、逆方向の電圧が主スイッチ手段１２のコレクタ－エミッタ間に印加されること防ぐ。 The main switch means 12 can be configured by using a semiconductor element that energizes / shuts off the main primary coil 111a, for example, an IGBT (Insulated Gate Bipolar Transistor). The gate G, which is the control terminal of the main switch means 12, is connected to the ECU 3 via the connection terminal of the connector 152, and is ON / OFF controlled by the main ignition signal Si1 generated by the ignition control means 31. That is, when the main switch means 12 is turned on, the main primary coil 111a is energized, and when the main switch means 12 is turned off, the energization to the main primary coil 111a is cut off. The bypass line provided in parallel with the main switch means 12 is provided with a rectifying means in the forward direction from the grounding point GND side toward the ignition coil 11 side, and the voltage in the reverse direction is the collector of the main switch means 12. Prevents application between emitters.
　上記のように、主点火信号Ｓｉ１によって主スイッチ手段１２がＯＮになり、主一次コイル１１１ａに通電されると、主一次電流Ｉ１ａが流れることで順方向の磁束が増加し、主スイッチ手段１２がＯＦＦになって主一次電流Ｉ１ａが遮断されると、順方向の磁束が急激に減ぜられる（見かけ上、順方向の磁束と逆向きの遮断磁束が生じる）。この磁束変化を妨げる向きの磁界を生じさせるように、二次コイル１１２側に高電圧が発生し、点火プラグ２の放電ギャップ間に放電火花が生じ、二次電流Ｉ２が流れる。このように、主一次コイル１１１ａに対する通電・遮断制御によって点火プラグ２を放電させる制御を、本明細書では、通常放電制御という。 As described above, when the main switch means 12 is turned on by the main ignition signal Si1 and the main primary coil 111a is energized, the main primary current I1a flows to increase the magnetic flux in the forward direction, and the main switch means 12 is turned on. When the main primary current I1a is turned off and the main primary current I1a is cut off, the forward magnetic flux is sharply reduced (apparently, a breaking magnetic flux in the opposite direction to the forward magnetic flux is generated). A high voltage is generated on the secondary coil 112 side so as to generate a magnetic field in a direction that hinders this change in magnetic flux, a discharge spark is generated between the discharge gaps of the spark plug 2, and a secondary current I2 flows. In this specification, the control of discharging the spark plug 2 by the energization / cutoff control of the main primary coil 111a is referred to as a normal discharge control.
　第１副スイッチ手段１３は、第１副一次コイル１１１ｂへの通電・遮断を行う半導体素子、例えば、ＩＧＢＴを用いて構成できる。第１副スイッチ手段１３の制御端子であるゲートＧは、コネクタ１５２の接続端子を介してＥＣＵ３に接続され、点火制御手段３１が生成する副点火信号Ｓｉ２によってＯＮ・ＯＦＦ制御される。すなわち、第１副スイッチ手段１３がＯＮになることで第１副一次コイル１１１ｂへの通電が行われ、第１副スイッチ手段１３がＯＦＦになることで第１副一次コイル１１１ｂへの通電が遮断される。なお、第１副スイッチ手段１３と並列に設けられたバイパス線路には、接地点ＧＮＤ側から点火コイル１１側に向かって順方向となる整流手段を設け、逆方向の電圧が第１副スイッチ手段１３のコレクタ－エミッタ間に印加されること防ぐ。 The first sub switch means 13 can be configured by using a semiconductor element that energizes / shuts off the first sub primary coil 111b, for example, an IGBT. The gate G, which is the control terminal of the first sub-switch means 13, is connected to the ECU 3 via the connection terminal of the connector 152, and is ON / OFF controlled by the sub-ignition signal Si2 generated by the ignition control means 31. That is, when the first sub-switch means 13 is turned on, the energization of the first sub-primary coil 111b is performed, and when the first sub-switch means 13 is turned off, the energization of the first sub-primary coil 111b is cut off. Will be done. The bypass line provided in parallel with the first sub-switch means 13 is provided with a rectifying means in the forward direction from the grounding point GND side toward the ignition coil 11 side, and the voltage in the reverse direction is the first sub-switch means. Prevents application between 13 collectors and emitters.
　上記のように、副点火信号Ｓｉ２によって第１副スイッチ手段１３がＯＮになり、第１副一次コイル１１１ｂに通電されると、副一次電流Ｉ１ｂが流れることで順方向の磁束が増加し、第１副スイッチ手段１３がＯＦＦになって副一次電流Ｉ１ｂが遮断されると、順方向の磁束が急激に減ぜられる（見かけ上、順方向の磁束と逆向きの遮断磁束が生じる）。この磁束変化を妨げる向きの磁界を生じさせるように、二次コイル１１２側に高電圧が発生し、点火プラグ２の放電ギャップ間に放電火花が生じ、二次電流Ｉ２が流れる。このように、第１副一次コイル１１１ｂに対する通電・遮断制御によって点火プラグ２を放電させる制御を、本明細書では、代替放電制御という。 As described above, when the first sub-switch means 13 is turned on by the sub-ignition signal Si2 and the first sub-primary coil 111b is energized, the sub-primary current I1b flows to increase the magnetic flux in the forward direction. 1 When the sub switch means 13 is turned off and the sub primary current I1b is cut off, the forward magnetic flux is sharply reduced (apparently, a breaking magnetic flux in the opposite direction to the forward magnetic flux is generated). A high voltage is generated on the secondary coil 112 side so as to generate a magnetic field in a direction that hinders this change in magnetic flux, a discharge spark is generated between the discharge gaps of the spark plug 2, and a secondary current I2 flows. In this specification, the control of discharging the spark plug 2 by the energization / cutoff control of the first sub-primary coil 111b is referred to as an alternative discharge control.
　第２副スイッチ手段１４は、第２副一次コイル１１１ｃへの通電・遮断を行う半導体素子、例えば、ＩＧＢＴを用いて構成できる。第２副スイッチ手段１４の制御端子であるゲートＧは、コネクタ１５２の接続端子を介してＥＣＵ３に接続され、点火制御手段３１が生成する重畳信号ＳｐによってＯＮ・ＯＦＦ制御される。すなわち、第２副スイッチ手段１４がＯＮになることで第２副一次コイル１１１ｃへの通電が行われ、第２副スイッチ手段１４がＯＦＦになることで第２副一次コイル１１１ｃへの通電が遮断される。 The second sub switch means 14 can be configured by using a semiconductor element that energizes / shuts off the second sub primary coil 111c, for example, an IGBT. The gate G, which is the control terminal of the second sub switch means 14, is connected to the ECU 3 via the connection terminal of the connector 152, and is ON / OFF controlled by the superimposed signal Sp generated by the ignition control means 31. That is, when the second sub-switch means 14 is turned on, the second sub-primary coil 111c is energized, and when the second sub-switch means 14 is turned off, the energization to the second sub-primary coil 111c is cut off. Will be done.
　上記のように、重畳信号Ｓｐによって第２副スイッチ手段１４がＯＮになり、第２副一次コイル１１１ｃに通電されると、遮断磁束と同方向の重畳磁束が生じる。したがって、点火後（主一次コイル１１１ａや第１副一次コイル１１１ｂへの通電を遮断したタイミング以降）の適宜なタイミングで、第２副一次コイル１１１ｃに対して通電を行うと、逆方向の磁束（二次側に高電圧を発生させた磁界と同じ向きの磁束）が生じ、二次側の磁界が減衰して二次側起電力が低下してゆくことを抑制できるので、第２副一次コイル１１１ｃへの通電を遮断するまで二次電流Ｉ２を高く維持できる。このように、第２副一次コイル１１１ｃに対する通電・遮断制御を点火後に行うことで、二次コイル１１２に与えられる放電エネルギを重畳的に増加させ制御を、本明細書では、点火後重畳放電制御という。 As described above, when the second sub switch means 14 is turned on by the superimposition signal Sp and the second sub primary coil 111c is energized, a superimposition magnetic flux in the same direction as the breaking magnetic flux is generated. Therefore, when the second sub-primary coil 111c is energized at an appropriate timing after ignition (after the timing when the energization to the main primary coil 111a and the first sub-primary coil 111b is cut off), the magnetic flux in the opposite direction ( A magnetic flux in the same direction as the magnetic flux that generated the high voltage on the secondary side) is generated, and it is possible to suppress the decrease in the secondary side electromotive force due to the attenuation of the secondary side magnetic field. The secondary current I2 can be maintained high until the energization of the 111c is cut off. In this way, by performing energization / shutoff control for the second sub-primary coil 111c after ignition, the discharge energy given to the secondary coil 112 is superposedly increased and controlled. That is.
　ここで、上述した内燃機関用点火装置１における点火制御手段３１による制御例を、図２～図６に基づいて説明する。 Here, a control example by the ignition control means 31 in the above-mentioned ignition device 1 for an internal combustion engine will be described with reference to FIGS. 2 to 6.
　図２の前段は、通常放電制御を行う燃焼サイクルを示すもので、１回の燃焼サイクル中に主一次コイル１１１ａのみを使って放電エネルギを二次コイル１１２に与える基本的な制御である。まず、燃焼サイクル中の所定タイミングで主点火信号Ｓｉ１がＯＮになると、主スイッチ手段１２がＯＮとなって、主一次電流Ｉ１ａが流れる。主一次コイル１１１ａへの通電開始から時間経過に伴って、主一次電流Ｉ１ａは飽和電流に達するまで増加してゆき、主一次コイル１１１ａにエネルギが蓄積される。そして、点火タイミングで主点火信号Ｓｉ１がＯＦＦになると（信号レベルがＨからＬになると）、主一次コイル１１１ａに蓄積されたエネルギに応じた起電力が二次側に生じて、二次電流Ｉ２が流れると共に点火プラグ２の電極間に絶縁破壊を起こして、気筒内に放電火花を生じさせる（容量放電）。その後も、二次コイル１１２に与えられた磁気エネルギの放出による放電（誘導放電）が０．５～２．５ｍｓ程度続くが、二次コイル１１２に生じた起電力は次第に弱まり、二次電流Ｉ２も減衰してゆく。 The first stage of FIG. 2 shows a combustion cycle in which normal discharge control is performed, and is a basic control in which discharge energy is given to the secondary coil 112 by using only the main primary coil 111a during one combustion cycle. First, when the main ignition signal Si1 is turned ON at a predetermined timing during the combustion cycle, the main switch means 12 is turned ON and the main primary current I1a flows. With the passage of time from the start of energization of the main primary coil 111a, the main primary current I1a increases until the saturation current is reached, and energy is accumulated in the main primary coil 111a. Then, when the main ignition signal Si1 is turned off at the ignition timing (when the signal level changes from H to L), an electromotive force corresponding to the energy stored in the main primary coil 111a is generated on the secondary side, and the secondary current I2 is generated. Causes dielectric breakdown between the electrodes of the spark plug 2 as the current flows, causing a discharge spark in the cylinder (capacitive discharge). After that, the discharge (induced discharge) due to the release of the magnetic energy given to the secondary coil 112 continues for about 0.5 to 2.5 ms, but the electromotive force generated in the secondary coil 112 gradually weakens and the secondary current I2. Also decays.
　図２の後段は、通常放電制御を行った後に点火後重畳放電制御を行う燃焼サイクルを示すもので、主一次コイル１１１ａへの通電・遮断による点火タイミング以降（点火後）に、第２副スイッチ手段１４を制御して第２副一次コイル１１１ｃへ通電開始し、第２副一次コイル１１１ｃから誘導放電を維持するために必要十分なエネルギを二次側に与える制御である。 The latter part of FIG. 2 shows a combustion cycle in which superposition discharge control is performed after ignition after normal discharge control, and the second sub switch is performed after the ignition timing (after ignition) by energizing / shutting off the main primary coil 111a. This is a control in which the means 14 is controlled to start energizing the second sub-primary coil 111c, and the secondary side is supplied with sufficient energy necessary to maintain the induced discharge from the second sub-primary coil 111c.
　まず、燃焼サイクル中の所定タイミングで主点火信号Ｓｉ１がＯＮになると、主スイッチ手段１２がＯＮとなって、主一次電流Ｉ１ａが流れる。主一次コイル１１１ａへの通電から時間経過に伴って、主一次電流Ｉ１ａは飽和電流に達するまで増加してゆき、主一次コイル１１１ａにエネルギが蓄積される。そして、点火タイミングで主点火信号Ｓｉ１がＯＦＦになると（信号レベルがＨからＬになると）、主一次コイル１１１ａに蓄積されたエネルギに応じた起電力が二次側に生じて、二次電流Ｉ２が流れると共に点火プラグ２の電極間に絶縁破壊が起き、気筒内に放電火花が生じる。 First, when the main ignition signal Si1 is turned on at a predetermined timing during the combustion cycle, the main switch means 12 is turned on and the main primary current I1a flows. With the passage of time from the energization of the main primary coil 111a, the main primary current I1a increases until the saturation current is reached, and energy is accumulated in the main primary coil 111a. Then, when the main ignition signal Si1 is turned off at the ignition timing (when the signal level changes from H to L), an electromotive force corresponding to the energy stored in the main primary coil 111a is generated on the secondary side, and the secondary current I2 is generated. Along with the flow, dielectric breakdown occurs between the electrodes of the spark plug 2, and discharge sparks occur in the cylinder.
　上記のようにして点火プラグ２に容量放電が生じ、放電電流が流れ始めた後の適宜なタイミングで、点火制御手段３１が重畳信号ＳｐをＯＮ（例えば、信号レベルをＬからＨ）にし、第２副スイッチ手段１４をＯＮにする。第２副スイッチ手段１４がＯＮになると第２副一次コイル１１１ｃに重畳電流Ｉ１ｃが流れ、飽和電流に達するまで徐々に増加してゆき、二次コイル１１２に生じた磁界と同じ向きの重畳磁束も増加してゆく。したがって、二次コイル１１２の電磁エネルギ放出による二次電流Ｉ２の低下を補うように、第２副一次コイル１１１ｃに生じた重畳磁束が二次コイル１１２に作用することとなり、二次電流Ｉ２が高電流のまま保持され、気筒内燃焼に好適な高電流期間を効率良く長期化できる。なお、第２副一次コイル１１１ｃへの通電を継続する重畳時間は、好適な気筒内燃焼に必要十分な高電流の維持期間（高電流期間）と同等程度の時間に設定しておくことが望ましい。 As described above, the ignition control means 31 turns on the superimposed signal Sp (for example, the signal level is changed from L to H) at an appropriate timing after the capacity discharge occurs in the spark plug 2 and the discharge current starts to flow. 2 Turn on the sub switch means 14. When the second sub switch means 14 is turned on, a superposed current I1c flows through the second sub primary coil 111c and gradually increases until the saturation current is reached, and the superposed magnetic flux in the same direction as the magnetic field generated in the secondary coil 112 also increases. It will increase. Therefore, the superimposed magnetic flux generated in the second secondary primary coil 111c acts on the secondary coil 112 so as to compensate for the decrease in the secondary current I2 due to the emission of electromagnetic energy of the secondary coil 112, and the secondary current I2 is high. The current is maintained, and the high current period suitable for in-cylinder combustion can be efficiently extended. It is desirable that the superimposition time for continuing the energization of the second secondary primary coil 111c is set to a time equivalent to the maintenance period (high current period) of a high current necessary and sufficient for suitable in-cylinder combustion. ..
　その後、第２副一次コイル１１１ｃへの通電を行う重畳時間が経過すると、点火制御手段３１が重畳信号ＳｐをＯＦＦにして、第２副スイッチ手段１４をＯＦＦにする。これにより、第２副一次コイル１１１ｃに重畳電流Ｉ１ｃが流れなくなり、第２副一次コイル１１１ｃによる重畳磁束が二次コイル１１２に作用しなくなるので、二次電流Ｉ２も流れなくなる。 After that, when the superimposition time for energizing the second sub-primary coil 111c elapses, the ignition control means 31 turns off the superimposition signal Sp and turns off the second sub-switch means 14. As a result, the superimposed current I1c does not flow in the second secondary primary coil 111c, and the superimposed magnetic flux by the second secondary primary coil 111c does not act on the secondary coil 112, so that the secondary current I2 also does not flow.
　上述したように、点火制御手段３１が第２副一次コイル１１１ｃを用いた点火後重畳放電制御を行えば、主点火信号Ｓｉ１のＯＮ時間を長くすることなく、二次コイル１１２に与える放電エネルギを増大させ、点火プラグ２の電極間を流れる放電電流を高電流に維持できる期間を長期化できる。しかも、第２副一次コイル１１１ｃから二次コイル１１２に作用させる重畳磁束は、気筒内燃焼を好適に維持するために必要十分な高電流を発生・維持できる程度で良いことから、第２副一次コイル１１１ｃへの通電に要するエネルギは低く抑えることができ、燃費効率の向上に有効である。 As described above, if the ignition control means 31 performs post-ignition superimposed discharge control using the second secondary primary coil 111c, the discharge energy given to the secondary coil 112 without lengthening the ON time of the main ignition signal Si1 can be obtained. It can be increased to prolong the period during which the discharge current flowing between the electrodes of the spark plug 2 can be maintained at a high current. Moreover, the superimposed magnetic flux acting from the second secondary primary coil 111c to the secondary coil 112 is sufficient to generate and maintain a high current necessary and sufficient for optimally maintaining in-cylinder combustion. Therefore, the second secondary primary coil is sufficient. The energy required to energize the coil 111c can be kept low, which is effective in improving fuel efficiency.
　なお、点火制御手段３１が適宜なデューティー比の重畳信号Ｓｐを生成して、第２副スイッチ手段１４をＰＷＭ制御できるようにしておけば、第２副一次コイル１１１ｃに流す重畳電流Ｉ１ｃを適宜に増減させる点火後重畳放電制御が可能となる。このように、点火制御手段３１が、第２副一次コイル１１１ｃに生じさせる重畳磁束を任意にコントロールして、過不足の無い適切な放電エネルギが二次側に与えられるようにすれば、更なる燃費効率向上を期待できる。 If the ignition control means 31 generates a superimposition signal Sp having an appropriate duty ratio so that the second sub-switch means 14 can be PWM-controlled, the superimposition current I1c to be passed through the second sub-primary coil 111c can be appropriately applied. Superimposition discharge control after ignition to increase or decrease is possible. In this way, if the ignition control means 31 arbitrarily controls the superimposed magnetic flux generated in the second secondary primary coil 111c so that appropriate discharge energy without excess or deficiency is given to the secondary side, further. Expected to improve fuel efficiency.
　図３の前段は、代替放電制御を行う燃焼サイクルを示すもので、１回の燃焼サイクル中に第１副一次コイル１１１ｂのみを使って放電エネルギを二次コイル１１２に与える制御である。まず、燃焼サイクル中の所定タイミングで副点火信号Ｓｉ２がＯＮになると、第１副スイッチ手段１３がＯＮとなって、副一次電流Ｉ１ｂが流れる。第１副一次コイル１１１ｂへの通電開始から時間経過に伴って、副一次電流Ｉ１ｂは飽和電流に達するまで増加してゆき、第１副一次コイル１１１ｂにエネルギが蓄積される。そして、点火タイミングで副点火信号Ｓｉ２がＯＦＦになると（信号レベルがＨからＬになると）、第１副一次コイル１１１ｂに蓄積されたエネルギに応じた起電力が二次側に生じて、二次電流Ｉ２が流れると共に点火プラグ２の電極間に絶縁破壊を起こして、気筒内に放電火花を生じさせる（容量放電）。その後も、二次コイル１１２に与えられた磁気エネルギの放出による放電（誘導放電）が０．５～２．５ｍｓ程度続くが、二次コイル１１２に生じた起電力は次第に弱まり、二次電流Ｉ２も減衰してゆく。 The first stage of FIG. 3 shows a combustion cycle in which alternative discharge control is performed, and is a control in which discharge energy is given to the secondary coil 112 by using only the first secondary primary coil 111b during one combustion cycle. First, when the sub-ignition signal Si2 is turned on at a predetermined timing during the combustion cycle, the first sub-switch means 13 is turned on and the sub-primary current I1b flows. With the passage of time from the start of energization of the first secondary primary coil 111b, the secondary primary current I1b increases until the saturation current is reached, and energy is stored in the first secondary primary coil 111b. Then, when the sub-ignition signal Si2 is turned off at the ignition timing (when the signal level changes from H to L), an electromotive force corresponding to the energy stored in the first sub-primary coil 111b is generated on the secondary side, and the secondary side is generated. As the current I2 flows, dielectric breakdown occurs between the electrodes of the spark plug 2 and discharge sparks are generated in the cylinder (capacitive discharge). After that, the discharge (induced discharge) due to the release of the magnetic energy given to the secondary coil 112 continues for about 0.5 to 2.5 ms, but the electromotive force generated in the secondary coil 112 gradually weakens and the secondary current I2. Also decays.
　上述したように、第１副一次コイル１１１ｂは、主一次コイル１１１ａと同じ構造のコイルを用いるので、主一次コイル１１１ａに代えて第１副一次コイル１１１ｂを用いた代替放電制御においても、主一次コイル１１１ａを用いた通常放電制御と同等の放電エネルギを二次コイル１１２に与えることができる。したがって、主一次コイル１１１ａに何らかの異常が生じて使用不可能となった場合には、第１副一次コイル１１１ｂを用いた代替放電制御によって内燃機関の運転を継続できるので、内燃機関が動作不能となる最悪の状態を回避できる。 As described above, since the first sub-primary coil 111b uses a coil having the same structure as the main primary coil 111a, even in the alternative discharge control using the first sub-primary coil 111b instead of the main primary coil 111a, the main primary coil 111b is also used. Discharge energy equivalent to that of normal discharge control using the coil 111a can be applied to the secondary coil 112. Therefore, if some abnormality occurs in the main primary coil 111a and it becomes unusable, the operation of the internal combustion engine can be continued by the alternative discharge control using the first secondary primary coil 111b, so that the internal combustion engine cannot operate. You can avoid the worst situation.
　図３の後段は、代替放電制御を行った後に点火後重畳放電制御を行う燃焼サイクルを示すもので、第１副一次コイル１１１ｂへの通電・遮断による点火タイミング以降（点火後）に、第２副スイッチ手段１４を制御して第２副一次コイル１１１ｃへ通電開始し、第２副一次コイル１１１ｃから誘導放電を維持するために必要十分なエネルギを二次側に与える制御である。代替放電制御を行った後に点火後重畳放電制御を行った場合も、通常放電を行った後に点火後重畳放電制御を行った場合と同様、二次電流Ｉ２が高電流のまま保持され、気筒内燃焼に好適な高電流期間を効率良く長期化できる。 The latter part of FIG. 3 shows a combustion cycle in which the superimposed discharge control is performed after ignition after performing the alternative discharge control, and the second is after the ignition timing (after ignition) by energizing / shutting off the first sub-primary coil 111b. This is a control in which the sub-switch means 14 is controlled to start energizing the second sub-primary coil 111c, and the secondary side is supplied with sufficient energy necessary to maintain the induced discharge from the second sub-primary coil 111c. Even when the post-ignition superimposition discharge control is performed after the alternative discharge control is performed, the secondary current I2 is maintained at a high current and in the cylinder as in the case where the post-ignition superimposition discharge control is performed after the normal discharge is performed. The high current period suitable for combustion can be efficiently extended.
　図４の前段は、点火前重畳放電制御を行う燃焼サイクルを示すもので、１回の燃焼サイクル中に主一次コイル１１１ａおよび第１副一次コイル１１１ｂの両方を使って放電エネルギを二次コイル１１２に与える制御である。なお、図４に示す点火前重畳放電制御は、二次側に与える放電エネルギを最大化するものであるから、本明細書では、点火前重畳放電制御（ＭＡＸ）という。 The first stage of FIG. 4 shows a combustion cycle in which pre-ignition superimposition discharge control is performed, and discharge energy is transferred to the secondary coil 112 by using both the main primary coil 111a and the first sub-primary coil 111b during one combustion cycle. It is the control given to. Since the pre-ignition superimposition discharge control shown in FIG. 4 maximizes the discharge energy given to the secondary side, it is referred to as pre-ignition superimposition discharge control (MAX) in the present specification.
　まず、燃焼サイクル中の所定タイミングで主点火信号Ｓｉ１と副点火信号Ｓｉ２が同時にＯＮになると（信号レベルがＬからＨになると）、主スイッチ手段１２と第１副スイッチ手段１３が同時にＯＮとなって、主一次電流Ｉ１ａと副一次電流Ｉ１ｂが同時に流れる。主一次コイル１１１ａおよび第１副一次コイル１１１ｂへの通電開始から時間経過に伴って、主一次電流Ｉ１ａと副一次電流Ｉ１ｂは飽和電流に達するまで増加してゆき、主一次コイル１１１ａと第１副一次コイル１１１ｂにそれぞれエネルギが蓄積される。 First, when the main ignition signal Si1 and the sub-ignition signal Si2 are turned on at the same time (when the signal level changes from L to H) at a predetermined timing during the combustion cycle, the main switch means 12 and the first sub-switch means 13 are turned on at the same time. Therefore, the main primary current I1a and the secondary primary current I1b flow at the same time. With the passage of time from the start of energization of the main primary coil 111a and the first sub-primary coil 111b, the main primary current I1a and the sub-primary current I1b increase until the saturation current is reached, and the main primary coil 111a and the first sub are increased. Energy is stored in each of the primary coils 111b.
　そして、点火タイミングで主点火信号Ｓｉ１と副点火信号Ｓｉ２が同時にＯＦＦになると（信号レベルがＨからＬになると）、主一次コイル１１１ａと第１副一次コイル１１１ｂに蓄積されたエネルギに応じた起電力が二次側に生じて、二次電流Ｉ２が流れると共に点火プラグ２の電極間に絶縁破壊を起こして、気筒内に放電火花を生じさせる。しかも、点火前重畳放電制御（ＭＡＸ）を行うと、通常放電制御で流れる二次電流Ｉ２（図４の前段に二点鎖線で示す）よりも大きな二次電流Ｉ２が流れるので、二次電流Ｉ２が高電流のまま保持され、気筒内燃焼に好適な高電流期間を効率良く長期化できる。 Then, when the main ignition signal Si1 and the sub-ignition signal Si2 are turned off at the same time at the ignition timing (when the signal level changes from H to L), the electromotive force corresponds to the energy stored in the main primary coil 111a and the first sub-primary coil 111b. Electricity is generated on the secondary side, a secondary current I2 flows, and dielectric breakdown occurs between the electrodes of the spark plug 2, causing discharge sparks in the cylinder. Moreover, when the pre-ignition superimposition discharge control (MAX) is performed, a secondary current I2 larger than the secondary current I2 (shown by the alternate long and short dash line in the front stage of FIG. 4) flowing in the normal discharge control flows, so that the secondary current I2 flows. Is maintained at a high current, and the high current period suitable for in-cylinder combustion can be efficiently extended.
　したがって、点火制御手段３１が主一次コイル１１１ａおよび第１副一次コイル１１１ｂを用いた点火前重畳放電制御（ＭＡＸ）を行えば、主点火信号Ｓｉ１のＯＮ時間を長くすることなく、二次コイル１１２に与える放電エネルギを増大させ、点火プラグ２の電極間を流れる放電電流を高電流に維持できる期間を長期化できる。 Therefore, if the ignition control means 31 performs pre-ignition superimposition discharge control (MAX) using the main primary coil 111a and the first sub-primary coil 111b, the secondary coil 112 without lengthening the ON time of the main ignition signal Si1. It is possible to increase the discharge energy given to the spark plug 2 and prolong the period during which the discharge current flowing between the electrodes of the spark plug 2 can be maintained at a high current.
　図４の後段は、点火前重畳放電制御（ＭＡＸ）を行った後に点火後重畳放電制御を行う燃焼サイクルを示す。この燃焼サイクルでは、主一次コイル１１１ａおよび第１副一次コイル１１１ｂへの通電・遮断による点火タイミング以降（点火後）に、点火制御手段３１が第２副スイッチ手段１４を制御して第２副一次コイル１１１ｃへの通電を開始させ、第２副一次コイル１１１ｃから誘導放電を維持するために必要十分なエネルギを二次側に与える。点火前重畳放電制御（ＭＡＸ）を行った後に点火後重畳放電制御を行うと、点火前重畳放電制御（ＭＡＸ）で流れる二次電流Ｉ２（図４の後段に二点鎖線で示す）よりも大きな二次電流Ｉ２が流れるので、二次電流Ｉ２が更に高電流のまま保持され、気筒内燃焼に好適な高電流期間を効率良く長期化できる。 The latter part of FIG. 4 shows a combustion cycle in which pre-ignition superimposition discharge control (MAX) is performed and then post-ignition superimposition discharge control is performed. In this combustion cycle, the ignition control means 31 controls the second sub-switch means 14 after the ignition timing (after ignition) by energizing / shutting off the main primary coil 111a and the first sub-primary coil 111b, and the second sub-primary. The energization of the coil 111c is started, and the secondary side is provided with sufficient energy necessary to maintain the induced discharge from the second secondary primary coil 111c. When the post-ignition superimposition discharge control is performed after the pre-ignition superimposition discharge control (MAX) is performed, it is larger than the secondary current I2 (shown by the two-point chain line in the latter part of FIG. 4) flowing in the pre-ignition superimposition discharge control (MAX). Since the secondary current I2 flows, the secondary current I2 is maintained at a higher current, and the high current period suitable for in-cylinder combustion can be efficiently extended.
　上述したように、点火前重畳放電制御（ＭＡＸ）を行った後に点火後重畳放電制御を行えば、超希薄燃焼スーパーリーンバーンによるエンジンの点火にも適用し得るものの、二次側へのエネルギ供給が過剰となり、燃費を悪くすることが危惧される。そこで、点火前重畳放電制御により二次側に与える放電エネルギを最大化せず、必要十分な程度にとどめる点火前重畳放電制御を行うことができれば、燃費の悪化を抑制できる。 As described above, if pre-ignition superimposition discharge control (MAX) is performed and then post-ignition superimposition discharge control is performed, it can be applied to engine ignition by ultra-lean combustion super lean burn, but energy is supplied to the secondary side. Is excessive, and there is a concern that fuel efficiency will deteriorate. Therefore, if the pre-ignition superimposition discharge control that does not maximize the discharge energy given to the secondary side and keeps it to a necessary and sufficient level can be performed, the deterioration of fuel efficiency can be suppressed.
　図５の前段は、二次側に与える放電エネルギを通常放電制御のときより５０％程度増加させて最適化した点火前重畳放電制御を行う燃焼サイクルを示す。これを、本明細書では、点火前重畳放電制御（５０％増）という。 The first stage of FIG. 5 shows a combustion cycle in which the discharge energy given to the secondary side is increased by about 50% from that in the normal discharge control to perform the optimized pre-ignition superposed discharge control. This is referred to herein as pre-ignition superimposed discharge control (50% increase).
　まず、燃焼サイクル中の所定タイミングで主点火信号Ｓｉ１がＯＮになると（信号レベルがＬからＨになると）、主スイッチ手段１２がＯＮとなって、主一次電流Ｉ１ａが流れる。主一次コイル１１１ａへの通電開始から時間経過に伴って、主一次電流Ｉ１ａは飽和電流に達するまで増加してゆき、主一次コイル１１１ａにエネルギが蓄積される。一方、主点火信号Ｓｉ１がＯＮになってから所定の遅延時間ｄｔが経過したタイミングで副点火信号Ｓｉ２がＯＮになり（信号レベルがＬからＨになり）、第１副スイッチ手段１３がＯＮとなって、副一次電流Ｉ１ｂが流れはじめる。第１副一次コイル１１１ｂへの通電開始から時間経過に伴って、副一次電流Ｉ１ｂは飽和電流に達するまで増加してゆき、第１副一次コイル１１１ｂにもエネルギが蓄積される。 First, when the main ignition signal Si1 is turned ON (when the signal level changes from L to H) at a predetermined timing during the combustion cycle, the main switch means 12 is turned ON and the main primary current I1a flows. With the passage of time from the start of energization of the main primary coil 111a, the main primary current I1a increases until the saturation current is reached, and energy is accumulated in the main primary coil 111a. On the other hand, the sub-ignition signal Si2 is turned ON (the signal level changes from L to H) at the timing when a predetermined delay time dt has elapsed since the main ignition signal Si1 is turned ON, and the first sub-switch means 13 is turned ON. Then, the secondary primary current I1b begins to flow. With the passage of time from the start of energization of the first secondary primary coil 111b, the secondary primary current I1b increases until the saturation current is reached, and energy is also stored in the first secondary primary coil 111b.
　そして、点火タイミングで主点火信号Ｓｉ１と副点火信号Ｓｉ２が同時にＯＦＦになると（信号レベルがＨからＬになると）、主一次コイル１１１ａと第１副一次コイル１１１ｂに蓄積されたエネルギに応じた起電力が二次側に生じて、二次電流Ｉ２が流れると共に点火プラグ２の電極間に絶縁破壊を起こして、気筒内に放電火花を生じさせる。このとき、第１副一次コイル１１１ｂへの通電時間は遅延時間ｄｔだけ短いため、第１副一次コイル１１１ｂに貯えられたエネルギは、主一次コイル１１１ａに貯えられたエネルギの半分程度に抑えられる。よって、点火前重畳放電制御（５０％増）を行うと、通常放電制御で流れる二次電流Ｉ２（図５の前段に二点鎖線で示す）よりも大きいが、点火前重畳放電制御（ＭＡＸ）よりも抑えられた二次電流Ｉ２を流すことができる。すなわち、点火前重畳放電制御（５０％増）を行えば、燃費の悪化を抑制しつつ、二次電流Ｉ２が必要十分な高電流に保持できるので、気筒内燃焼に好適な高電流期間を効率良く長期化できる。 Then, when the main ignition signal Si1 and the sub-ignition signal Si2 are turned off at the same time at the ignition timing (when the signal level changes from H to L), the electromotive force corresponds to the energy stored in the main primary coil 111a and the first sub-primary coil 111b. Electricity is generated on the secondary side, a secondary current I2 flows, and dielectric breakdown occurs between the electrodes of the spark plug 2, causing discharge sparks in the cylinder. At this time, since the energization time of the first secondary primary coil 111b is short by the delay time dt, the energy stored in the first secondary primary coil 111b is suppressed to about half of the energy stored in the main primary coil 111a. Therefore, when the pre-ignition superimposition discharge control (50% increase) is performed, it is larger than the secondary current I2 (shown by the alternate long and short dash line in the previous stage of FIG. 5) flowing in the normal discharge control, but the pre-ignition superimposition discharge control (MAX). It is possible to pass a secondary current I2 that is suppressed more than that. That is, if the pre-ignition superimposition discharge control (50% increase) is performed, the secondary current I2 can be maintained at a necessary and sufficient high current while suppressing the deterioration of fuel efficiency, so that the high current period suitable for in-cylinder combustion is efficient. It can be extended well.
　なお、主スイッチ手段１２と第１副スイッチ手段１３を個別に制御して行う点火前重畳放電制御では、遅延時間ｄｔを適宜に設定することで、第１副一次コイル１１１ｂに貯えるエネルギを０％～１００％まで調整できるので、必要十分な任意増量で点火前重畳放電制御を行える。したがって、点火制御手段３１によって点火後重畳放電制御（任意増量）を行えば、主点火信号Ｓｉ１のＯＮ時間を長くすることなく、二次コイル１１２に与える放電エネルギを増大させ、点火プラグ２の電極間を流れる放電電流を高電流に維持できる期間を長期化でき、しかも、燃費の悪化を抑制できる。 In the pre-ignition superimposed discharge control performed by individually controlling the main switch means 12 and the first sub switch means 13, the energy stored in the first sub primary coil 111b is 0% by appropriately setting the delay time dt. Since it can be adjusted up to 100%, pre-ignition superimposed discharge control can be performed with a necessary and sufficient arbitrary increase. Therefore, if the ignition control means 31 performs post-ignition superimposed discharge control (arbitrary increase), the discharge energy given to the secondary coil 112 is increased without lengthening the ON time of the main ignition signal Si1, and the electrode of the spark plug 2 is increased. The period during which the discharge current flowing between them can be maintained at a high current can be extended, and the deterioration of fuel efficiency can be suppressed.
　図５の後段は、点火前重畳放電制御（５０％増）を行った後に点火後重畳放電制御を行う燃焼サイクルを示す。この燃焼サイクルでは、主一次コイル１１１ａおよび第１副一次コイル１１１ｂへの通電・遮断による点火タイミング以降（点火後）に、点火制御手段３１が第２副スイッチ手段１４を制御して第２副一次コイル１１１ｃへの通電を開始させ、第２副一次コイル１１１ｃから誘導放電を維持するために必要十分なエネルギを二次側に与える。点火前重畳放電制御（５０％増）を行った後に点火後重畳放電制御を行うと、点火前重畳放電制御（５０％増）で流れる二次電流Ｉ２（図５の後段に二点鎖線で示す）よりも大きな二次電流Ｉ２が流れるので、二次電流Ｉ２が更に高電流のまま保持され、気筒内燃焼に好適な高電流期間を効率良く長期化できる。 The latter part of FIG. 5 shows a combustion cycle in which pre-ignition superimposition discharge control (50% increase) is performed and then post-ignition superimposition discharge control is performed. In this combustion cycle, the ignition control means 31 controls the second sub-switch means 14 after the ignition timing (after ignition) by energizing / shutting off the main primary coil 111a and the first sub-primary coil 111b, and the second sub-primary. The energization of the coil 111c is started, and the secondary side is provided with sufficient energy necessary to maintain the induced discharge from the second secondary primary coil 111c. When the post-ignition superimposition discharge control is performed after the pre-ignition superimposition discharge control (50% increase) is performed, the secondary current I2 (shown by a two-point chain line in the latter part of FIG. 5) flowing under the pre-ignition superimposition discharge control (50% increase) is shown. ), Since the secondary current I2 flows, the secondary current I2 is maintained at a higher current, and the high current period suitable for in-cylinder combustion can be efficiently extended.
　点火制御手段３１が生成した主点火信号Ｓｉ１、副点火信号Ｓｉ２、重畳信号Ｓｐを点火コイルユニット１０へ供給することで行われる各種の放電制御は、二次コイル１１２に与える放電エネルギを高める制御に限定されない。 Various discharge controls performed by supplying the main ignition signal Si1, the sub-ignition signal Si2, and the superimposed signal Sp generated by the ignition control means 31 to the ignition coil unit 10 are for controlling to increase the discharge energy given to the secondary coil 112. Not limited.
　図６の前段は、主点火信号Ｓｉ１によって主一次コイル１１１ａに対する通電・遮断を行い、二次側に放電エネルギを与える通常放電制御を行う燃焼サイクルを示す。図６の後段は、副点火信号Ｓｉ２によって第１副一次コイル１１１ｂに対する通電・遮断を行い、二次側に放電エネルギを与える代替放電制御を行う燃焼サイクルを示す。このように、点火制御手段３１が、通常放電制御を行う燃焼サイクルと、代替放電制御を行う燃焼サイクルを交互に行う交互放電制御に変更すれば、主一次コイル１１１ａと第１副一次コイル１１１ｂへの通電頻度が半分になるので、主一次コイル１１１ａおよび第１副一次コイル１１１ｂの発熱を抑制できる。 The first stage of FIG. 6 shows a combustion cycle in which the main primary coil 111a is energized and cut off by the main ignition signal Si1 and normal discharge control is performed to give discharge energy to the secondary side. The latter part of FIG. 6 shows a combustion cycle in which the primary sub-primary coil 111b is energized and cut off by the sub-ignition signal Si2, and alternative discharge control is performed to give discharge energy to the secondary side. As described above, if the ignition control means 31 is changed to the alternating discharge control in which the combustion cycle in which the normal discharge control is performed and the combustion cycle in which the alternative discharge control is performed are alternately performed, the main primary coil 111a and the first sub-primary coil 111b are reached. Since the frequency of energization of the main coil 111a is halved, the heat generation of the main primary coil 111a and the first secondary primary coil 111b can be suppressed.
　例えば、主一次コイル１１１ａの過剰な発熱が検知されたとき、主一次コイル１１１ａによる通常放電制御を一切止めて、第１副一次コイル１１１ｂによる代替放電制御に切り替えることも可能であるが、いずれは第１副一次コイル１１１ｂにも過剰な発熱が生ずる危険性がある。一方、主一次コイル１１１ａの過剰な発熱が検知されたとき、交互放電制御を行えば、主一次コイル１１１ａの熱放散を促しつつ、第１副一次コイル１１１ｂの過剰な昇温を抑えられるので、安定した点火制御を長期間継続でき、内燃機関用点火装置１としての信頼性を高められる。また、点火制御手段３１による交互放電制御では、第２副一次コイル１１１ｃを用いた点火後重畳放電制御を併用することも可能である。主一次コイル１１１ａと第１副一次コイル１１１ｂの過熱を抑制しつつ、各燃焼サイクルにおいて二次側へ与える放電エネルギを高める必要がある場合には、点火後重畳放電制御を併用した交互放電制御が有効である。 For example, when excessive heat generation of the main primary coil 111a is detected, it is possible to stop the normal discharge control by the main primary coil 111a and switch to the alternative discharge control by the first secondary primary coil 111b. There is a risk that excessive heat generation will also occur in the first secondary primary coil 111b. On the other hand, when the excessive heat generation of the main primary coil 111a is detected, if the alternate discharge control is performed, the heat dissipation of the main primary coil 111a can be promoted and the excessive temperature rise of the first secondary primary coil 111b can be suppressed. Stable ignition control can be continued for a long period of time, and the reliability of the ignition device 1 for an internal combustion engine can be enhanced. Further, in the alternate discharge control by the ignition control means 31, it is also possible to use the post-ignition superimposition discharge control using the second secondary primary coil 111c together. When it is necessary to increase the discharge energy given to the secondary side in each combustion cycle while suppressing the overheating of the main primary coil 111a and the primary secondary primary coil 111b, alternate discharge control using post-ignition superposition discharge control is performed. It is valid.
　以上、本発明に係る内燃機関用点火装置の実施形態を添付図面に基づき説明したが、本発明は、この実施形態に限定されるものではなく、特許請求の範囲に記載の構成を変更しない範囲で、公知既存の等価な技術手段を転用することにより実施しても構わない。 Although the embodiment of the ignition device for an internal combustion engine according to the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to this embodiment and the configuration described in the claims is not changed. Therefore, it may be carried out by diverting a known and existing equivalent technical means.
　１　　　　内燃機関用点火装置
　１０　　　点火コイルユニット
　１１　　　点火コイル
　１１１ａ　主一次コイル
　１１１ｂ　第１副一次コイル
　１１１ｃ　第２副一次コイル
　１１２　　二次コイル
　１２　　　主スイッチ手段
　１３　　　第１副スイッチ手段
　１４　　　第２副スイッチ手段
　２　　　　点火プラグ
　３　　　　ＥＣＵ
　３１　　　点火制御手段
　４　　　　直流電源 1 Ignition device for internal combustion engine 10 Ignition coil unit 11 Ignition coil 111a Main primary coil 111b 1st sub primary coil 111c 2nd sub primary coil 112 Secondary coil 12 Main switch means 13 1st sub switch means 14 2nd sub switch means 2 Spark plug 3 ECU
31 Ignition control means 4 DC power supply

Claims (4)

  1. 　通電により順方向の磁束が増加し、電流を遮断することにより順方向の磁束が減ぜられる主一次コイルと、
    　前記主一次コイルとは別に設けられ、通電により前記主一次コイルと同じ順方向の磁束が生じ、電流を遮断することにより前記順方向の磁束が減ぜられる第１副一次コイルと、
    　前記順方向の磁束が減ぜられた以降の任意のタイミングで通電することにより前記順方向の磁束と逆方向の重畳磁束を生じさせる第２副一次コイルと、
    　一端側が点火プラグと接続され、前記主一次コイル、前記第１副一次コイルおよび前記第２副一次コイルに生じた磁束が作用して放電エネルギが与えられる二次コイルと、
    　を有する点火コイルと、
    　バッテリから前記主一次コイルへの通電・遮断を切り替える主スイッチ手段と、
    　前記バッテリから前記第１副一次コイルへの通電・遮断を切り替える第１副スイッチ手段と、
    　前記第２副一次コイルへの通電・遮断を切り替える第２副スイッチ手段と、
    　前記主スイッチ手段、前記第１副スイッチ手段および前記第２副スイッチ手段を制御して、燃焼サイクルの所定のタイミングで前記点火プラグに放電火花を発生させる点火制御手段と、
    　を備え、
    　前記点火制御手段は、前記主一次コイルおよび／または前記第１副一次コイルへの通電を遮断した点火タイミング以降に、所定の重畳時間だけ前記第２副一次コイルへの通電を行うことで、前記二次コイルに与えられる前記放電エネルギを重畳的に増加させる点火後重畳放電制御を可能としたことを特徴とする内燃機関用点火装置。     The main primary coil, which increases the magnetic flux in the forward direction by energizing and decreases the magnetic flux in the forward direction by cutting off the current.
    A first sub-primary coil, which is provided separately from the main primary coil and in which the same forward magnetic flux as the main primary coil is generated by energization and the forward magnetic flux is reduced by interrupting the current.
    A second sub-primary coil that generates a superposed magnetic flux in the opposite direction to the forward magnetic flux by energizing at an arbitrary timing after the forward magnetic flux is reduced.
    A secondary coil in which one end side is connected to a spark plug and magnetic flux generated in the main primary coil, the first sub-primary coil, and the second sub-primary coil acts to give discharge energy.
    With an ignition coil,
    A main switch means for switching between energization and disconnection from the battery to the main primary coil,
    A first sub-switch means for switching energization / disconnection from the battery to the first sub-primary coil, and
    The second sub-switch means for switching the energization / cutoff of the second sub-primary coil,
    An ignition control means that controls the main switch means, the first sub switch means, and the second sub switch means to generate a discharge spark in the spark plug at a predetermined timing of a combustion cycle.
    Equipped with
    The ignition control means energizes the second sub-primary coil for a predetermined superposition time after the ignition timing when the energization of the main primary coil and / or the first sub-primary coil is cut off. An ignition device for an internal combustion engine, which enables post-ignition superimposition discharge control that superimposes and increases the discharge energy given to a secondary coil.
  2. 　前記点火制御手段は、前記主スイッチ手段と前記第１副スイッチ手段とを同じタイミングで制御することにより、前記主一次コイルへの通電開始と前記第１副一次コイルへの通電開始を同時に行う点火前重畳放電制御を可能としたことを特徴とする請求項１に記載の内燃機関用点火装置。 By controlling the main switch means and the first sub switch means at the same timing, the ignition control means simultaneously starts energizing the main primary coil and energizing the first sub primary coil. The ignition device for an internal combustion engine according to claim 1, wherein pre-superimposed discharge control is possible.
  3. 　前記点火制御手段は、前記主スイッチ手段と前記第１副スイッチ手段を個別のタイミングで制御することにより、前記主一次コイルへの通電開始と前記第１副一次コイルへの通電開始を個別に行う点火前重畳放電制御を可能としたことを特徴とする請求項１又は請求項２に記載の内燃機関用点火装置。 The ignition control means individually starts energization of the main primary coil and energization of the first sub-primary coil by controlling the main switch means and the first sub-switch means at individual timings. The ignition device for an internal combustion engine according to claim 1 or 2, wherein pre-ignition superimposed discharge control is possible.
  4. 　前記点火制御手段は、前記主スイッチ手段の制御によって前記主一次コイルへの通電・遮断を行う通常放電制御と、前記第１副スイッチ手段の制御によって前記第１副一次コイルへの通電・遮断を行う副放電制御とを、交互に行う交互放電制御を可能としたことを特徴とする請求項１～請求項３の何れか１項に記載の内燃機関用点火装置。 The ignition control means controls the main primary coil to energize and shut off the main primary coil, and controls the first sub switch means to energize and shut off the first sub primary coil. The ignition device for an internal combustion engine according to any one of claims 1 to 3, wherein the auxiliary discharge control is performed alternately and the alternate discharge control is performed.
PCT/JP2020/036347 2020-09-25 2020-09-25 Ignition device for internal combustion engine WO2022064645A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62107272A (en) * 1985-10-31 1987-05-18 Nippon Soken Inc Ignition device for internal combustion engine
JP2010261395A (en) * 2009-05-08 2010-11-18 Toyota Motor Corp Ignition control device of internal combustion engine
WO2018083719A1 (en) * 2016-11-01 2018-05-11 日立オートモティブシステムズ阪神株式会社 Internal combustion engine ignition device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62107272A (en) * 1985-10-31 1987-05-18 Nippon Soken Inc Ignition device for internal combustion engine
JP2010261395A (en) * 2009-05-08 2010-11-18 Toyota Motor Corp Ignition control device of internal combustion engine
WO2018083719A1 (en) * 2016-11-01 2018-05-11 日立オートモティブシステムズ阪神株式会社 Internal combustion engine ignition device

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