WO2020230255A1 - Dispositif d'allumage - Google Patents

Dispositif d'allumage Download PDF

Info

Publication number
WO2020230255A1
WO2020230255A1 PCT/JP2019/019038 JP2019019038W WO2020230255A1 WO 2020230255 A1 WO2020230255 A1 WO 2020230255A1 JP 2019019038 W JP2019019038 W JP 2019019038W WO 2020230255 A1 WO2020230255 A1 WO 2020230255A1
Authority
WO
WIPO (PCT)
Prior art keywords
switching element
secondary current
control device
control
internal combustion
Prior art date
Application number
PCT/JP2019/019038
Other languages
English (en)
Japanese (ja)
Inventor
中川　光
裕一 村本
尚紀 片岡
成瀬　祐介
棚谷　公彦
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2021519092A priority Critical patent/JP7055243B2/ja
Priority to PCT/JP2019/019038 priority patent/WO2020230255A1/fr
Publication of WO2020230255A1 publication Critical patent/WO2020230255A1/fr

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • F02P15/10—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits having continuous electric sparks
    • 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 application relates to an ignition device.
  • Patent Document 1 by turning on and off the second primary winding at high speed during the discharge period, it is possible to prevent the secondary current from continuing to increase and prevent the secondary current from becoming too large. There is.
  • Patent Document 1 by frequently turning off the second primary winding, it is possible to prevent the secondary current from becoming too large. ing.
  • a counter electromotive force is generated in the second primary winding, and the secondary current is rapidly reduced to the level before the current superposition. Therefore, every time the second primary winding is turned off, the effect of stabilizing the discharge is impaired due to the increase in the discharge current, and the discharge may be interrupted due to the in-cylinder flow or the like, so that the ignitability is sufficiently improved. It wasn't planned.
  • an ignition device capable of appropriately increasing the secondary current so that the secondary current does not increase or decrease too much by energizing the second primary winding during the discharge period is desired.
  • the ignition device is A first primary winding in which an energizing magnetic flux is generated by energization, a second primary winding in which an energizing magnetic flux is generated in a direction opposite to the energizing magnetic flux of the first primary winding by energization, and the first winding.
  • a transformer having a primary winding and a secondary winding magnetically coupled to the second primary winding to supply discharge energy to the ignition plug.
  • the second switching element is turned on, It is provided with a control device for turning on / off the first switching element during the on period of the second switching element.
  • the ignition device since the second primary winding is energized during the spark discharge, additional magnetic energy is supplied to the secondary winding, and the discharge current (secondary current) flowing between the electrodes is generated. To increase. As a result, the spark discharge is strengthened, and the ignitability of the air-fuel mixture and the extensibility of the spark discharge can be strengthened. Further, when the first switching element is turned on during the on period of the second switching element, the first primary winding generates an energizing magnetic flux in the direction opposite to the energizing magnetic flux of the second primary winding. However, the magnetic energy added to the secondary winding is weakened, and the secondary current can be reduced.
  • the first switching element is turned on while the second switching element is turned on, no back electromotive force is generated in the second primary winding, and the secondary current is gradually reduced. Can be done. Therefore, by turning the first switching element on and off during the on period of the second switching element, the secondary current can be prevented from increasing too much and not decreasing too much, and the secondary current can be appropriately increased. it can. Therefore, it is possible to suppress an increase in electrode wear of the spark plug while improving the ignitability.
  • FIG. It is a schematic circuit diagram of the ignition device which concerns on Embodiment 1.
  • FIG. It is a hardware block diagram of the control device which concerns on Embodiment 1.
  • FIG. It is a flowchart explaining the process of on / off control of the 1st switching element which concerns on Embodiment 1.
  • FIG. It is a time chart for demonstrating the control behavior which concerns on Embodiment 1.
  • FIG. It is a figure which shows the setting example of the on-off plan data which concerns on Embodiment 2.
  • FIG. It is a time chart for demonstrating the control behavior which concerns on Embodiment 2.
  • FIG. 1 is an electric circuit diagram showing a basic configuration of the ignition device 10 according to the first embodiment.
  • the ignition device 10 includes a spark plug 5, a transformer 3, a first switching element 1, a second switching element 2, a secondary current detection circuit 7, a control device 4, and the like.
  • the spark plug 5 has a first electrode 5A and a second electrode 5B facing each other through a gap, and ignites a combustible air-fuel mixture in a combustion chamber.
  • the first electrode 5A and the second electrode 5B of the spark plug 5 are arranged in the combustion chamber (inside the cylinder) of the internal combustion engine.
  • the first electrode 5A is connected to the secondary winding 3c, and the second electrode 5B is connected to the ground.
  • the transformer 3 the first primary winding 3a in which the energization magnetic flux is generated by energization and the second primary winding 3b in which the energization magnetic flux in the direction opposite to the energization magnetic flux of the first primary winding 3a is generated by energization.
  • a secondary winding 3c that is magnetically coupled to the first primary winding 3a and the second primary winding 3b to supply discharge energy to the spark plug 5.
  • the first primary winding 3a, the second primary winding 3b, and the secondary winding 3c are wound around a common iron core.
  • One end of the first primary winding 3a and the other end of the second primary winding 3b are made of the same DC power supply 6, and the other end of the first primary winding 3a is the first switching element. It is connected to the ground via 1, and one end of the second primary winding 3b is connected to the ground via the second switching element 2.
  • One end of the secondary winding 3c is connected to the first electrode 5A of the spark plug 5, and the other end of the secondary winding 3c is connected to the ground side.
  • the turns ratio between the first primary winding 3a and the secondary winding 3c determines the first switching element 1.
  • the voltage generated in the spark plug 5 when it is turned on and then turned off for the above time is set to be equal to or higher than the breakdown voltage of the spark plug 5, and is, for example, about 100. Since the transformer 3 and the first switching element 1 are configured like a flyback converter, a voltage at least twice the number of turns can be applied to the spark plug 5.
  • the voltage generated in the spark plug 5 is set to be equal to or higher than the discharge maintenance voltage, and is, for example, about 200 to 400 times.
  • the number of turns of the second primary winding 3b is configured to be smaller than the number of turns of the first primary winding 3a, and the number of turns of the second primary winding 3b is the second. It becomes 1/2 to 1/4 of the primary winding 3a of 1. Therefore, the energizing magnetic flux of the first primary winding 3a is stronger than the energizing magnetic flux of the second primary winding 3b, and the first is being energized while the second primary winding 3b is energized.
  • the secondary current I2 can be reduced by energizing the primary winding 3a of the above. With such a configuration, the operation of the first switching element 1 can cause dielectric breakdown between the electrodes of the spark plug 5, and the operation of the second switching element 2 can maintain the discharge between the electrodes of the spark plug 5. It will be possible.
  • the first switching element 1 is a switching element that turns on / off the energization from the DC power supply 6 to the first primary winding 3a.
  • the drive signal S_sw1 output from the control device 4 is input to the first switching element 1, and the first switching element 1 is turned on and off by the drive signal S_sw1.
  • the second switching element 2 is a switching element that turns on / off the energization from the DC power supply 6 to the second primary winding 3b.
  • the drive signal S_sw2 output from the control device 4 is input to the second switching element 2, and the second switching element 2 is turned on and off by the drive signal S_sw2.
  • first switching element 1 and the second switching element 2 for example, an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) or the like is used. Diodes may be connected in antiparallel to each switching element.
  • IGBT Insulated Gate Bipolar Transistor
  • MOSFET Metal Oxide Semiconductor Field Effect Transistor
  • the first switching element 1 By turning on the first switching element 1 for a predetermined time (for example, about 2 ms to 10 ms) and then turning it off, dielectric breakdown occurs between the electrodes of the spark plug 5. At this time, the maximum current flowing through the first switching element 1 is about 5A to 20A. After dielectric breakdown occurs between the electrodes of the spark plug 5, the second switching element 2 is turned on for a predetermined time (for example, about 200 us to 3 ms) to add the electric discharge between the electrodes of the spark plug 5 while maintaining the discharge. Supply the current of. At this time, the maximum current flowing through the second switching element 2 is about 10 A to 50 A. Therefore, it is desirable that the current rated value of the second switching element 2 is larger than the current rated value of the first switching element 1.
  • a predetermined time for example, about 2 ms to 10 ms
  • Switching elements with a large current rating generally have low resistance when turned on. Therefore, it is possible to suppress excessive heat generation of the element due to electric current and element destruction due to transient heat generation. Further, since an element having a larger chip size generally has a larger current rating value, the same effect can be obtained if the chip size of the second switching element 2 is larger than the chip size of the first switching element 1.
  • the first switching element 1 is turned on / off (switched) during the on period of the second switching element 2. Therefore, it is desirable that the switching time (falling time, rising time, rising time, falling time) of the first switching element 1 is shorter than the switching time of the second switching element 2.
  • the first switching element 1 can be turned on and off at a high frequency, and it is easy to control to reduce the peak of the secondary current described later.
  • the short switching time also contributes to the reduction of switching loss.
  • the secondary current detection circuit 7 is a circuit for detecting the secondary current I2 flowing in the secondary winding 3c during the spark discharge of the spark plug 5.
  • the secondary current detection circuit 7 is a resistor (hereinafter, referred to as a secondary current detection resistor 7) connected in series on the discharge path of the secondary current I2.
  • the low voltage side terminal of the secondary current detection resistor 7 is connected to the ground, and the high voltage side terminal of the secondary current detection resistor 7 is connected to the other end of the secondary winding 3c.
  • the voltage of the high voltage side terminal of the secondary current detection resistor 7 is input to the control device 4.
  • the secondary current detection circuit 7 may be a current transformer or a Hall sensor arranged on the discharge path of the secondary current I2.
  • control device 4 is a control device for an internal combustion engine that controls an internal combustion engine. Each function of the control device 4 is realized by a processing circuit provided in the control device 4.
  • the control device 4 is a storage device 91 that exchanges data with an arithmetic processing unit 90 (computer) such as a CPU (Central Processing Unit) and an arithmetic processing unit 90 as a processing circuit.
  • An input circuit 92 for inputting an external signal to the arithmetic processing unit 90, an output circuit 93 for outputting a signal from the arithmetic processing unit 90 to the outside, and the like are provided.
  • the arithmetic processing device 90 includes an ASIC (Application Specific Integrated Circuit), an IC (Integrated Circuit), a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), various logic circuits, and various signal processing circuits. You may. Further, a plurality of arithmetic processing units 90 of the same type or different types may be provided, and each processing may be shared and executed.
  • the storage device 91 includes a RAM (Random Access Memory) configured to be able to read and write data from the arithmetic processing device 90, a ROM (Read Only Memory) configured to be able to read data from the arithmetic processing device 90, and the like. Has been done.
  • the input circuit 92 is connected to the secondary current detection circuit 7 and various sensors 21 of the internal combustion engine (crank angle sensor, cam angle sensor, intake air amount detection sensor, pressure sensor, water temperature sensor, power supply voltage sensor, etc.). It is equipped with an A / D converter or the like that inputs an output signal to the arithmetic processing device 90.
  • the output circuit 93 is connected to a first switching element 1, a second switching element 2, and various electric loads 22 (injectors, exhaust gas recirculation valves, etc.) of an internal combustion engine, and a control signal is transmitted from the arithmetic processing device 90 to these. It is equipped with a drive circuit that outputs. It is desirable that the cutoff frequency of the low-pass filter of the drive circuit connected to the first switching element 1 is set to 100 kHz or more.
  • the arithmetic processing unit 90 executes software (program) stored in the storage device 91 such as ROM, and controls the storage device 91, the input circuit 92, the output circuit 93, and the like. It is realized by cooperating with other hardware of the device 4.
  • the setting data such as the control setting data used by the control device 4 is stored in the storage device 91 such as the ROM as a part of the software (program).
  • the control device 4 determines the rotation speed of the internal combustion engine, filling efficiency (pressure information in the cylinder), cooling water temperature, exhaust gas recirculation rate, etc., based on the output signals of various input sensors. Detects the operating state of the internal combustion engine, calculates the ignition timing, target air-fuel ratio, fuel injection amount, control amount of the exhaust gas recirculation valve, etc. based on the operating state, and various types of internal combustion engines such as injectors and exhaust gas recirculation valves.
  • the electric load 22, the first switching element 1, the second switching element 2, and the like are driven and controlled.
  • the control device 4 turns on the first switching element 1 to turn on the energization of the first primary winding 3a, and then turns off the first switching element 1 to turn on the first primary winding 3a.
  • the power supply to the ignition plug 5 is turned off to generate a spark discharge in the spark plug 5.
  • the control device 4 calculates the energization period and ignition timing (ignition crank angle) of the first primary winding 3a.
  • the control device 4 determines the energization period and the ignition timing based on the operating state of the internal combustion engine.
  • the operating state of the internal combustion engine is the filling efficiency (pressure in the cylinder) of the internal combustion engine, the rotation speed of the internal combustion engine, the exhaust gas recirculation rate, and the like.
  • the control device 4 turns on the first switching element 1 during the energization period, energizes the first primary winding 3a, and then turns off the first switching element 1 at the ignition timing.
  • the energization of the first primary winding 3a is cut off, a high voltage is generated in the secondary winding 3c, and a spark discharge is generated in the spark plug 5.
  • the spark discharge continues until the magnetic energy stored in the iron core of the spark plug 5 is reduced.
  • the control device 4 turns on the second switching element 2 during the spark discharge period.
  • the second primary winding 3b is energized during the spark discharge, additional magnetic energy is supplied to the secondary winding 3c, and the discharge current (secondary current I2) flowing between the electrodes increases.
  • the spark discharge is strengthened, and the ignitability of the air-fuel mixture and the extensibility of the spark discharge are strengthened.
  • discharge current discharge current
  • the control device 4 refers to the control setting data in which the relationship between the operating state of the internal combustion engine and the control parameters of the on time and the off time of the second switching element 2 is set in advance. Calculate the on-time and off-time control parameters corresponding to the current operating state of the internal combustion engine.
  • the control parameter of the ON timing is the lower limit threshold value I2_thL of the secondary current I2.
  • the lower limit threshold value I2_thL is shared with the threshold value for turning off the first switching element 1 described later.
  • the control device 4 turns on the second switching element 2 when the detected value of the secondary current I2 becomes smaller than the lower limit threshold value I2_thL after the start of discharge.
  • the control parameter at the on time may be the elapsed time after the start of discharge, and the control device 4 may turn on the second switching element 2 when the elapsed time after the start of discharge reaches the threshold value. Good.
  • the control parameter for the off time is the off time after the start of discharge.
  • the control device 4 turns off the second switching element 2 when the elapsed time after the start of discharge reaches the off time.
  • the secondary current I2 means the absolute value of the secondary current I2. Further, “after the start of discharge” and “after the start of spark discharge” are after the first switching element 1 is turned off in order to generate spark discharge.
  • control parameters for the on time and the off time which are preset by a preliminary test or the like, are stored in the storage device 91 and read out.
  • the control device 4 may learn the control parameters of the on-time and the off-time by machine learning or the like, and use the learned values.
  • the operating conditions of the internal combustion engine are the filling efficiency (pressure in the cylinder) of the internal combustion engine, the rotation speed of the internal combustion engine, the compression ratio of the internal combustion engine, the air-fuel ratio, the exhaust gas recirculation rate, the elapsed time after the start of the internal combustion engine, and the internal combustion engine.
  • the compression ratio of the internal combustion engine is added when the internal combustion engine is provided with a mechanism capable of changing the compression ratio of the internal combustion engine.
  • the operating state of the internal combustion engine is the filling efficiency of the internal combustion engine, the rotation speed of the internal combustion engine, and the exhaust gas recirculation rate.
  • the control device 4 turns on / off the first switching element 1 during the on period of the second switching element 2.
  • the first primary winding 3a becomes the energizing magnetic flux of the second primary winding 3b.
  • Generates an energizing magnetic flux in the opposite direction weakens the magnetic energy added to the secondary winding 3c, and can reduce the secondary current I2.
  • the first switching element 1 is turned on with the second switching element 2 turned on, no counter electromotive force is generated in the second primary winding 3b, and the secondary current I2 is moderated. Can be reduced to.
  • the secondary current I2 can be prevented from increasing too much and not decreasing too much, and the secondary current I2 can be appropriately adjusted. Can be increased. Therefore, it is possible to suppress an increase in electrode wear of the spark plug while improving the ignitability.
  • the control device 4 detects the secondary current I2 based on the output signal of the secondary current detection circuit 7. Then, the control device 4 turns on / off the first switching element 1 based on the detected value of the secondary current I2 during the on period of the second switching element 2. According to this configuration, since it is based on the detected value of the secondary current I2, it is possible to increase the secondary current I2 appropriately and not to increase the secondary current I2 too much with high accuracy.
  • the control device 4 turns on the first switching element 1 when the detected value of the secondary current I2 becomes larger than the upper limit threshold value I2_thH during the on period of the second switching element, and the first switching element 1 is turned on.
  • the detected value of the secondary current I2 becomes smaller than the lower limit threshold value I2_thL set to a value equal to or lower than the upper limit threshold value I2_thH after the switching element 1 is turned on, the first switching element 1 is turned off.
  • the lower limit threshold value I2_thL is set to a value smaller than the upper limit threshold value I2_thH, but it may be set to the same value.
  • the secondary current I2 can be accurately controlled within the range of the upper limit threshold value I2_thH and the lower limit threshold value I2_thL.
  • the set value of the upper limit threshold value I2_thH can control the suppression of increase in electrode wear of the spark plug, and the set value of the lower limit threshold value I2_thL can manage the improvement of ignitability.
  • the optimum set value of the upper limit threshold value I2_thH and the optimum set value of the lower limit threshold value I2_thL which can improve the ignitability and suppress the increase in electrode wear, change depending on the operating state of the internal combustion engine. For example, it is desirable to maintain a large discharge current under operating conditions in which the flow in the cylinder is large and the discharge is easily blown off. However, if the discharge current is excessively large, the life of the spark plug is shortened because the amount of electrode consumption is large even if the ignitability can be improved. Therefore, since there is a trade-off relationship between ignitability and electrode wear, it is desirable to determine an appropriate secondary current (discharge current) value based on the operating state of the internal combustion engine.
  • control device 4 refers to the control setting data in which the relationship between the operating state of the internal combustion engine and the upper limit threshold value I2_thH and the lower limit threshold value I2_thL is set in advance, and refers to the upper limit threshold value I2_thH and the upper limit threshold value I2_thH corresponding to the current operating state of the internal combustion engine.
  • the lower limit threshold I2_thL is calculated.
  • the operating conditions of the internal combustion engine are the filling efficiency (pressure in the cylinder) of the internal combustion engine, the rotation speed of the internal combustion engine, the compression ratio of the internal combustion engine, the air-fuel ratio, the exhaust gas recirculation rate, the elapsed time after the start of the internal combustion engine, and the internal combustion engine.
  • the compression ratio of the internal combustion engine is added when the internal combustion engine is provided with a mechanism capable of changing the compression ratio of the internal combustion engine.
  • the operating state of the internal combustion engine is the filling efficiency of the internal combustion engine, the rotation speed of the internal combustion engine, and the exhaust gas recirculation rate.
  • the upper limit threshold value I2_thH and the lower limit threshold value I2_thL which are preset by a preliminary test or the like, are stored in the storage device 91 and read out.
  • the control device 4 determines the current value at which ignition was possible without misfire, learns the upper limit threshold value I2_thH and the lower limit threshold value I2_thL by machine learning or the like based on the determined current value, and uses the learned value. You may.
  • step S101 the control device 4 determines whether or not the second switching element 2 (drive signal S_sw2) is turned on (1).
  • the control device 4 determines that the second switching element 2 is not turned on, it is not in the on period of the second switching element 2, so the process proceeds to step S106, and the first switching element 1 (drive signal) After turning off (0) S_sw1), the process ends.
  • the control device 4 determines that the second switching element 2 is turned on, it is in the on period of the second switching element, so the process proceeds to step S102.
  • step S102 the control device 4 determines whether or not the detected value of the secondary current I2 is larger than the upper limit threshold value I2_thH.
  • the control device 4 determines that the detected value of the secondary current I2 is larger than the upper limit threshold value I2_thH.
  • the control device 4 proceeds to step S103.
  • step S103 the control device 4 ends the process after setting the first switching element 1 (drive signal S_sw1) to ON (1).
  • the control device 4 determines that the detected value of the secondary current I2 is not larger than the upper limit threshold value I2_thH, the control device 4 proceeds to step S104.
  • step S104 the control device 4 determines whether or not the detected value of the secondary current I2 is smaller than the lower limit threshold value I2_thL.
  • the process proceeds to step S105, and the first switching element 1 (drive signal S_sw1) is turned off (0).
  • the control device 4 ends the process.
  • Control behavior will be described with reference to the time chart shown in FIG. In FIG. 4, the secondary current I2 is shown as an absolute value.
  • the control device 4 switches the drive signal S_sw1 to the first switching element 1 from off (0) to on (1) at the energization start timing, and the first primary winding 3a Is energized and a primary current I1 is passed to store magnetic energy in the iron core.
  • the control device 4 switches the drive signal S_sw1 from on to off to cut off the energization of the first primary winding 3a, and the secondary winding 3c becomes negative.
  • a high secondary voltage is generated, applied to the first electrode 5A of the spark plug 5, the potential drops sharply, and the insulation breakdown voltage is reached, the first electrode 5A and the second electrode of the spark plug 5 are reached.
  • a spark discharge occurs between the gap with 5B.
  • the spark discharge starts, the secondary voltage increases from the breakdown voltage to the discharge maintenance voltage.
  • the secondary current I2 (absolute value) increases stepwise from zero, and then gradually decreases as the magnetic energy stored in the iron core decreases.
  • the detection value of the secondary current I2 became smaller than the lower limit threshold value I2_thL, so that the control device 4 changed the drive signal S_sw2 to the second switching element 2 from off (0) to on (1). It is switched and the second primary winding 3b is energized.
  • the second primary current I12 flowing through the second primary winding 3b gradually increases, and the energizing magnetic flux generated by the second primary winding 3b gradually increases accordingly. Since the energizing magnetic flux of the second primary winding 3b is a magnetic flux in the same direction as the magnetic flux generated in the iron core, the magnetic energy additionally supplied to the secondary winding 3c via the iron core gradually increases, and 2 The next current I2 also gradually increases.
  • the detected value of the secondary current I2 became larger than the upper limit threshold value I2_thH, so that the control device 4 switches the drive signal S_sw1 to the first switching element 1 from off to on, and the first 1 The next winding 3a is energized.
  • the control device 4 switches the drive signal S_sw1 to the first switching element 1 from off to on, and the first 1 The next winding 3a is energized.
  • the first switching element 1 By making the first switching element 1 conductive, the current additionally supplied to the secondary winding 3c and a part of the magnetic energy stored in the iron core flow to the first primary winding 3a. Therefore, the secondary current I2 decreases.
  • the control device 4 causes the current to flow through the first switching element 1 without interrupting the current flowing through the second switching element 2, a counter electromotive force is applied to the second primary winding 3b.
  • the detected value of the secondary current I2 became smaller than the lower limit threshold value I2_thL, so that the control device 4 switches the drive signal S_sw1 to the first switching element 1 from on to off, and the first 1 The energization of the next winding 3a is cut off. Since no current flows through the first primary winding 3a, the current supplied from the second primary winding 3b flows through the secondary winding 3c, and the secondary current I2 gradually increases again.
  • the detected value of the secondary current I2 becomes larger than the upper limit threshold value I2_thH, so that the control device 4 switches the drive signal S_sw1 to the first switching element 1 from off to on, and the first The primary winding 3a of the above is energized.
  • the secondary current I2 gradually decreased, and at time t7, the detected value of the secondary current I2 became smaller than the lower limit threshold value I2_thL, so that the control device 4 sent a drive signal to the first switching element 1.
  • S_sw1 is switched from on to off, and the energization of the first primary winding 3a is cut off.
  • the control device 4 has turned off the second switching element 2, so that the drive signal S_sw2 to the second switching element 2 is switched from on to off, and the first switching element 1 The on / off control is stopped and the first switching element 1 is left off.
  • the secondary current I2 is set to the upper limit threshold value I2_thH and the lower limit by turning on and off the first switching element 1 according to the detected value of the secondary current I2. It can be accurately maintained within the range of the threshold value I2_thL, and the improvement of ignitability and the suppression of the increase in electrode wear can be achieved in a well-balanced manner.
  • control device 4 In the above-described embodiment, the case where the control device 4 always turns on / off the first switching element 1 according to the detected value of the secondary current I2 has been described as an example. However, the control device 4 does not always need to be controlled by using the detected value of the secondary current I2. For example, the control device 4 determines the operation in one ignition cycle in advance and in the next ignition cycle. May turn on / off the first switching element 1 according to a predetermined operation regardless of the detected value of the secondary current I2.
  • the control device 4 may change the upper limit threshold value I2_thH and the lower limit threshold value I2_thL during one control period. For example, in the latter half of the discharge period, the pressure in the cylinder becomes high, and it tends to be difficult to maintain or ignite the discharge.
  • the control device 4 may be configured to increase the lower limit threshold I2_thL as the elapsed time after the start of the spark discharge increases during one discharge period. According to this configuration, good ignition performance can be maintained even in the latter half of the discharge period.
  • FIG. 5 is an electric circuit diagram showing a basic configuration of the ignition device 10 according to the second embodiment.
  • the ignition device 10 is not provided with the secondary current detection circuit 7, but is provided with the power supply voltage detection circuit 8, and accordingly, the first switching element in the control device 4 is turned on and off. The control process is different from the first embodiment.
  • the power supply voltage detection circuit 8 is a circuit for detecting the power supply voltage of the DC power supply 6.
  • the power supply voltage detection circuit 8 is composed of, for example, a voltage dividing resistor circuit, and outputs a voltage corresponding to the output voltage of the DC power supply 6.
  • the power supply voltage detection circuit 8 may be an electric wire that inputs the output voltage of the DC power supply 6 to the control device 4.
  • any circuit may be used as long as it can detect the power supply voltage of the DC power supply 6.
  • the control device 4 refers to the control setting data in which the relationship between the operating state of the internal combustion engine and the control parameters of the first switching element 1 and the second switching element 2 is set in advance, and is currently present.
  • the control parameters corresponding to the operating state of the internal combustion engine are calculated, and based on the calculated control parameters, the second switching element 2 is turned on during the spark discharge period, and the second switching element 2 is turned on during the on period.
  • the first switching element 1 is turned on and off.
  • the secondary current detection circuit 7 it is not necessary to provide the secondary current detection circuit 7, and the secondary current I2 can be appropriately controlled according to the operating state, and the improvement of ignitability and the suppression of the increase in electrode wear are well balanced. Can be achieved.
  • the control parameter of the first switching element is on / off planning data in which the relationship between the elapsed time and the on time and the on time is set in advance as shown in FIG.
  • the control device 4 turns on / off the first switching element 1 according to the elapsed time after the second switching element 2 is turned on.
  • the on / off planning data may be set in advance by a preliminary test so that the behavior of the secondary current I2 as in the first embodiment is obtained.
  • the control device 4 turns off (0) the first switching element 1 when the elapsed time after the second switching element 2 is turned on is 0, and the second switching element 2
  • the first switching element 1 is turned on (1)
  • the first switching element 1 is turned off (0)
  • the time T3 the first switching element 1 is turned on (1).
  • the control parameters of the first switching element are the on / off frequency and the on-duty of the pulse width modulation control (PWM), and the control device 4 is set during the on period of the second switching element 2.
  • the first switching element 1 may be turned on / off by pulse width modulation control according to the on / off frequency and on duty. As shown in FIG. 7, which will be described later, in the present embodiment, the pulse width modulation control is started from the off period.
  • the control parameter of the first switching element is switched according to the operating state of the internal combustion engine. For example, as the rotation speed of the internal combustion engine increases, the one ignition control period becomes shorter. Therefore, for example, the control parameters may be changed so that the on / off frequency becomes higher. Further, in a high-voltage environment and a strong flow environment, the energy required to maintain the discharge becomes large, so the control parameters may be adjusted so that the secondary current becomes large as a whole.
  • control parameter of the second switching element is data in which the on-time and the on-time after the start of discharge are set.
  • the control device 4 turns on the second switching element 2 when the elapsed time after the start of discharge is on, and turns on the second switching element 2 when the elapsed time after the start of discharge is off. Turn off.
  • the on-time and on-time data may be set in advance by a preliminary test so that the behavior of the secondary current I2 as in the first embodiment is obtained.
  • the control parameter of the second switching element is switched according to the operating state of the internal combustion engine. For example, as the rotation speed of the internal combustion engine increases, the one ignition control period becomes shorter. Therefore, for example, the control parameters may be changed so that the on period of the second switching element becomes shorter. .. Further, in a high-voltage environment and a strong flow environment, the energy required for maintaining the discharge becomes large, so that the on-time may be advanced so that the secondary current becomes large as a whole.
  • the operating conditions of the internal combustion engine are the filling efficiency (pressure in the cylinder) of the internal combustion engine, the rotation speed of the internal combustion engine, the compression ratio of the internal combustion engine, the air-fuel ratio, the exhaust gas recirculation rate, the elapsed time after the start of the internal combustion engine, and the internal combustion engine.
  • the compression ratio of the internal combustion engine is added when the internal combustion engine is provided with a mechanism capable of changing the compression ratio of the internal combustion engine.
  • the operating state of the internal combustion engine is the filling efficiency of the internal combustion engine, the rotation speed of the internal combustion engine, and the exhaust gas recirculation rate.
  • FIG. 7 shows the behavior of the secondary current I2 when the power supply voltage V1 is normal (graph on the left), when it is larger than normal (graph in the center), and when it is smaller than normal (graph on the right).
  • the secondary current I2 is shown as an absolute value.
  • the first switching element 1 and the second switching element 2 are appropriately controlled as will be described later.
  • the on-period of the first first switching element for generating a spark discharge does not change when the power supply voltage V1 is normal, large, or small. Therefore, the magnetic energy stored in the iron core during the on period changes in proportion to the power supply voltage V1, and the initial value of the secondary current I2 after the start of discharge changes. Therefore, the period from the start of discharge until the secondary current I2 reaches the lower limit threshold value I2_thL changes in proportion to the power supply voltage V1. Further, the rate of increase of the secondary current I2 due to the on of the second switching element changes in proportion to the power supply voltage V1. Further, the rate of decrease of the secondary current I2 due to the on of the first switching element changes in proportion to the power supply voltage V1.
  • the on / off frequency of the first switching element for controlling the secondary current I2 within the range of the upper limit threshold value I2_thH and the lower limit threshold value I2_thL changes in proportion to the power supply voltage V1.
  • the control device 4 actually performs control using these. Absent.
  • control device 4 changes the control parameters of the first switching element 1 and the second switching element 2 based on the detected value of the power supply voltage V1, and the spark discharge period based on the changed control parameters.
  • the second switching element 2 is turned on, and the first switching element 1 is turned on and off during the on period of the second switching element.
  • the on timing of the second switching element 2 after the start of discharge is accelerated. Further, as the detected value of the power supply voltage V1 increases, the on / off frequency of the first switching element during the on period of the second switching element is increased.
  • the control device 4 refers to the control setting data in which the relationship between the power supply voltage V1 and the operating state of the internal combustion engine and the control parameters of the first switching element 1 and the second switching element 2 is preset, and is currently used.
  • the control parameters corresponding to the detected value of the power supply voltage V1 and the operating state of the internal combustion engine are calculated, and based on the calculated control parameters, the second switching element 2 is turned on during the spark discharge period, and the second switching element 2 is turned on.
  • the first switching element 1 is turned on and off during the on period of the switching element 2.
  • the power supply voltage V1 may always be included in the operating state of the internal combustion engine.
  • Control behavior> The example shown in FIG. 7 is an example in which the control parameter of the first switching element is the on / off planning data as shown in FIG.
  • On / off plan data is preset for each operating state of the internal combustion engine and for each power supply voltage V1 by a preliminary test or the like so that the secondary current I2 oscillates between the upper limit threshold value I2_thH and the lower limit threshold value I2_thL.
  • the control device 4 the elapsed time after the start of discharge has reached the on time of the second switching element determined based on the operating state of the internal combustion engine and the detected value of the power supply voltage V1.
  • the second switching element (S_sw2) is turned on (1).
  • the control device 4 reaches the first on time (time t14, t24, t34). ), The first switching element (S_sw1) is turned on (1).
  • the control device 4 reaches when the elapsed time after turning on the second switching element reaches the first off time determined based on the operating state and the detected value of the power supply voltage V1 (time t15, t25, t35). ), The first switching element is turned off (0). After that, similarly, the control device 4 turns on or off the first switching element every time the elapsed time after turning on the second switching element reaches the second on or off time. Then, the control device 4 reaches when the elapsed time after the start of discharge reaches the off time of the second switching element determined based on the operating state and the detected value of the power supply voltage V1 (time t16, t26, t36). The second switching element is turned off (0) and the first switching element is turned off (0).
  • the ignition device 10 according to the third embodiment will be described. The description of the same components as in the first embodiment will be omitted.
  • the basic configuration and processing of the ignition device 10 according to the present embodiment are the same as those of the first embodiment.
  • the on / off control process of the first switching element in the control device 4 is different from that in the first embodiment.
  • the control device 4 turns on / off the first switching element 1 by pulse width modulation control (PWM: Pulse Width Modulation) during the on period of the second switching element 2.
  • PWM Pulse Width Modulation
  • the first switching element 1 can be systematically turned on and off without being affected by the detection delay of the secondary current I2 or the like.
  • the control device 4 starts the pulse width modulation control when the detected value of the secondary current I2 becomes larger than the upper limit threshold value I2_thH during the ON period of the second switching element. Pulse width modulation control starts from the on period. According to this configuration, by starting the pulse width modulation control, it is possible to prevent the secondary current I2 from becoming larger than the upper limit threshold value I2_thH.
  • the control device 4 changes the on-duty of the pulse width modulation control so that the detected value of the secondary current I2 falls within the target range.
  • the secondary current I2 can be accurately contained within the target range while taking advantage of the pulse width modulation control that is not easily affected by the detection delay of the secondary current I2. Therefore, by setting the target range, it is possible to improve the ignitability and suppress the increase in electrode wear in a well-balanced manner.
  • the initial value of the on-duty of each ignition cycle may be set based on one or both of the operating state of the internal combustion engine and the power supply voltage V1 as in the second embodiment. Alternatively, it may be set to the final value of on-duty in the previous ignition cycle. In this case, the on-duty in the first ignition cycle may be set to about 0.5.
  • the on-duty is changed according to the feed forward value set based on the operating state of the internal combustion engine and one or both of the power supply voltage V1 and the detected value of the secondary current I2 as in the second embodiment. It may be the total value with the feedback value, and the feedback value may be carried over to the next ignition cycle, or may be reset at each ignition cycle.
  • the on / off frequency of the pulse width modulation control is set based on the operating state of the internal combustion engine and one or both of the power supply voltage V1, as in the second embodiment, and is set in the range of, for example, about 1 kHz to 50 kHz.
  • the control device 4 increases the on-duty of the pulse width modulation control when the detected value of the secondary current I2 becomes larger than the upper limit threshold value I2_thH. According to this configuration, it is possible to suppress the detection value of the secondary current I2 from exceeding the upper limit threshold value I2_thH, and the suppression of the increase in electrode wear can be managed by the set value of the upper limit threshold value I2_thH.
  • control device 4 reduces the on-duty of the pulse width modulation control when the detected value of the secondary current I2 becomes smaller than the lower limit threshold value I2_thL set below the upper limit threshold value I2_thH. According to this configuration, it is possible to suppress the detection value of the secondary current I2 from falling below the lower limit threshold value I2_thL, and the improvement of the ignitability can be managed by the set value of the lower limit threshold value I2_thL.
  • the upper limit threshold value I2_thH and the lower limit threshold value I2_thL are set based on the operating state as in the first embodiment.
  • the lower limit threshold value I2_thL is set to a value smaller than the upper limit threshold value I2_thH, but may be set to the same value as the upper limit threshold value I2_thH.
  • the control device 4 is based on the deviation between the upper limit threshold value I2_thH (or the lower limit threshold value I2_thL) and the detected value of the secondary current I2.
  • the on-duty of the pulse width modulation control may be changed by feedback control such as integral control or proportional integral control.
  • the on / off control process according to the present embodiment can be configured as shown in the flowchart shown in FIG.
  • the control device 4 repeatedly executes the process of the flowchart of FIG. 8 for each calculation cycle.
  • step S201 the control device 4 determines whether or not the second switching element 2 (drive signal S_sw2) is turned on (1).
  • the control device 4 determines that the second switching element 2 is not turned on, it is not during the on period of the second switching element 2, so the process proceeds to step S205, and the execution determination information S_PWM of the pulse width modulation control is performed.
  • step S206 the first switching element 1 (drive signal S_sw1) is turned off (0), the execution of pulse width modulation control is stopped, and the process is terminated.
  • step S201 the control device 4 determines in step S201 that the second switching element 2 is turned on, the control device 4 proceeds to step S202.
  • step S202 the control device 4 determines whether or not the execution determination information S_PWM of the pulse width modulation control is set to ON (1). If the control device 4 determines that the execution determination information S_PWM of the pulse width modulation control is not turned on (1), the process proceeds to step S203, and whether or not the detected value of the secondary current I2 is larger than the upper limit threshold value I2_thH. To judge. When the control device 4 determines that the detected value of the secondary current I2 is larger than the upper limit threshold value I2_thH, the process proceeds to step S204, the execution determination information S_PWM of the pulse width modulation control is set to ON (1), and the pulse width modulation is performed. Start control. The control device 4 starts from the on period when the pulse width modulation control is started.
  • step S202 when the control device 4 determines in step S202 that the execution determination information S_PWM of the pulse width modulation control is turned on (1), the process proceeds to step S207, and the detected value of the secondary current I2 is the upper limit threshold value I2_thH. Determine if it is greater than.
  • step S207 the control device 4 determines in step S207 that the detected value of the secondary current I2 is larger than the upper limit threshold value I2_thH, the control device 4 proceeds to step S208, increases the on-duty duty by the change width ⁇ duty, and then ends the process. To do. The increased on-duty duty is reflected in the pulse width modulation control in progress.
  • the change width ⁇ duty is set in consideration of the calculation cycle, the discharge period, and the control response, and is set to, for example, about 0.05.
  • the smaller the change width ⁇ duty the finer the current value can be adjusted, but the control response becomes slower, and the larger the change width ⁇ duty, the faster the control response, but it becomes difficult to finely adjust the current value.
  • step S207 determines in step S207 that the detected value of the secondary current I2 is not larger than the upper limit threshold value I2_thH
  • step S209 the detected value of the secondary current I2 is smaller than the lower limit threshold value I2_thL.
  • the control device 4 proceeds to step S210, reduces the on-duty duty by the change width ⁇ duty, and then ends the process. To do. The reduced on-duty duty is reflected in the pulse width modulation control in progress.
  • step S209 determines in step S209 that the detected value of the secondary current I2 is not smaller than the lower limit threshold value I2_thL
  • the control device 4 ends the process without changing the on-duty duty.
  • Control behavior will be described with reference to the time chart shown in FIG. In FIG. 9, the secondary current I2 is shown as an absolute value. Since the time t51 to the time t52 in FIG. 9 is the same as the time t1 to the time t2 in FIG. 4, the description thereof will be omitted.
  • the secondary current I2 increases stepwise from zero, and then gradually decreases as the magnetic energy stored in the iron core decreases.
  • the detection value of the secondary current I2 became smaller than the lower limit threshold value I2_thL, so that the control device 4 changed the drive signal S_sw2 to the second switching element 2 from off (0) to on (1). It is switched and the second primary winding 3b is energized. After the start of energization, the secondary current I2 gradually increases.
  • the control device 4 turned on the execution determination information S_PWM of the pulse width modulation control (1) and started the pulse width modulation control. ing. Since the control device 4 starts from the on period at the start of the pulse width modulation control, the drive signal S_sw1 to the first switching element 1 is turned on (1) at time t54. After that, until the time t55, the secondary current I2 is within the range of the upper limit threshold value I2_thH and the lower limit threshold value I2_thL, so that the on-duty duty is not changed, but the average value of the secondary current I2 gradually decreases. ing.
  • the control device 4 reduces the on-duty duty by the change width ⁇ duty. Due to the decrease in on-duty duty, the average value of the secondary current I2 is gradually increasing. Then, at time t56, the detected value of the secondary current I2 becomes larger than the upper limit threshold value I2_thH, so that the control device 4 increases the on-duty duty by the change width ⁇ duty. Then, at time t57, the control device 4 has turned off the second switching element 2, so that the second switching element 2 is switched from on to off, and the execution determination information S_PWM of the pulse width modulation control is displayed. It is turned off (0), the pulse width modulation control is stopped, and the first switching element 1 is turned off.
  • the on-duty of the pulse width modulation control of the first switching element 1 is changed according to the detected value of the secondary current I2, so that the secondary current I2 can be accurately maintained within the range of the upper limit threshold value I2_thH and the lower limit threshold value I2_thL, and improvement of ignitability and suppression of increase in electrode wear can be achieved in a well-balanced manner.
  • control device 4 In the third embodiment, the case where the control device 4 always changes the on-duty of the pulse width modulation control according to the detected value of the secondary current I2 has been described as an example. However, the control device 4 does not always need to be controlled by using the detected value of the secondary current I2. For example, the control device 4 determines the operation in one ignition cycle in advance and in the next ignition cycle. May turn on / off the first switching element 1 according to a predetermined operation regardless of the detected value of the secondary current I2.
  • Embodiment 4 Next, the ignition device 10 according to the fourth embodiment will be described. The description of the same components as in the first embodiment will be omitted.
  • the basic configuration and processing of the ignition device 10 according to the present embodiment are the same as those of the first embodiment.
  • the on / off control process of the first switching element in the control device 4 is different from that in the first embodiment.
  • control device 4 turns on / off the first switching element 1 by pulse width modulation control (PWM: Pulse Width Modulation) during the on period of the second switching element 2.
  • PWM Pulse Width Modulation
  • the control device 4 starts the pulse width modulation control when the detected value of the secondary current I2 becomes larger than the upper limit threshold value I2_thH during the ON period of the second switching element. Pulse width modulation control starts from the on period.
  • the control device 4 changes the on / off frequency fpwm of the pulse width modulation control so that the detected value of the secondary current I2 falls within the target range.
  • the amplitude of the secondary current I2 can be decreased by increasing the on / off frequency fpwm, and the amplitude of the secondary current I2 can be increased by decreasing the on / off frequency fpww. Therefore, the vibration range of the secondary current I2 can be changed so that the detected value of the secondary current I2 falls within the target range, and by setting the target range, improvement of ignitability and suppression of increase in electrode wear are balanced. Can be achieved well.
  • the control device 4 increases the on / off frequency fpwm of the pulse width modulation control when the amplitude ⁇ I2 of the detected value of the secondary current I2 becomes larger than the target amplitude ⁇ I2_th.
  • the amplitude ⁇ I2 of the secondary current I2 can be prevented from becoming larger than the target amplitude ⁇ I2_th, and by setting the target amplitude ⁇ I2_th, improvement of ignitability and suppression of increase in electrode wear can be achieved in a well-balanced manner. it can.
  • control device 4 reduces the on / off frequency fpwm of the pulse width modulation control when the amplitude ⁇ I2 of the detected value of the secondary current becomes smaller than the target amplitude ⁇ I2_th. According to this configuration, the amplitude ⁇ I2 of the secondary current I2 can be prevented from becoming smaller than the target amplitude ⁇ I2_th, and the improvement of ignitability and the suppression of the increase in electrode wear can be appropriately balanced.
  • the control device 4 determines the maximum value and the minimum value of the detected value of the secondary current I2 within one cycle of the on / off frequency fpwm, and calculates the amplitude ⁇ I2 from the deviation between the maximum value and the minimum value.
  • the control device 4 refers to the control setting data in which the relationship between the operating state of the internal combustion engine and the target amplitude ⁇ I2_th is set in advance, and calculates the target amplitude ⁇ I2_th corresponding to the current operating state of the internal combustion engine.
  • the operating state of the internal combustion engine the above-mentioned type of operating state is used.
  • the target amplitude ⁇ I2_th set in advance by a preliminary test or the like is stored in the storage device 91 and read out.
  • the control device 4 may learn the target amplitude ⁇ I2_th by machine learning or the like and use the learned value.
  • the initial value of the on / off frequency fpwm of each ignition cycle may be set based on one or both of the operating state of the internal combustion engine and the power supply voltage V1 as in the second embodiment. Alternatively, it may be set to the final value of the on / off frequency fpwm in the previous ignition cycle. In this case, the on / off frequency fpwm in the first ignition cycle may be set within the range of about 1 kHz to 50 kHz.
  • the on / off frequency fpwm changes according to the feed forward value set based on the operating state of the internal combustion engine and one or both of the power supply voltage V1 and the detected value of the secondary current I2 as in the second embodiment. It may be the total value with the feedback value to be made, and the feedback value may be taken over in the next ignition cycle, or may be reset at each ignition cycle.
  • the on-duty of the pulse width modulation control is set based on the operating state of the internal combustion engine and one or both of the power supply voltage V1, as in the second embodiment.
  • the on-duty may be changed according to the detected value of the secondary current I2 as in the third embodiment.
  • the control device 4 changes the on / off frequency fpwm of the pulse width modulation control by feedback control such as integral control or proportional integral control based on the deviation between the target amplitude ⁇ I2_th and the amplitude ⁇ I2 of the detected value of the secondary current I2. You may let me.
  • the on / off control process according to the present embodiment can be configured as shown in the flowchart shown in FIG.
  • the control device 4 repeatedly executes the process of the flowchart of FIG. 10 for each calculation cycle.
  • steps S301 to S306 of FIG. 10 are the same as steps S201 to S206 of FIG. 8 of the third embodiment, description thereof will be omitted.
  • step S302 When the control device 4 determines in step S302 that the execution determination information S_PWM of the pulse width modulation control is turned on (1), the process proceeds to step S307, and the amplitude ⁇ I2 of the detected value of the secondary current I2 is the target amplitude. It is determined whether or not it is larger than ⁇ I2_th.
  • the target amplitude ⁇ I2_th may be set by the deviation between the upper limit threshold value I2_thH and the lower limit threshold value I2_thL.
  • step S307 If the control device 4 determines in step S307 that the amplitude ⁇ I2 of the detected value of the secondary current I2 is larger than the target amplitude ⁇ I2_th, the controller 4 proceeds to step S308, increases the on / off frequency fpww by the frequency change width ⁇ f, and then increases the on / off frequency fpwm by the frequency change width ⁇ f. , End the process.
  • the increased on / off frequency fpwm is reflected in the pulse width modulation control during execution.
  • the frequency change width ⁇ f is set in consideration of the calculation cycle, the discharge period, and the control response, and is set to, for example, about 1 kHz. The smaller the frequency change width ⁇ f, the finer the current value can be adjusted, but the control response becomes slower, and the larger the frequency change width ⁇ f, the faster the control response, but it becomes difficult to finely adjust the current value.
  • step S307 determines in step S307 that the amplitude ⁇ I2 of the detected value of the secondary current I2 is not larger than the target amplitude ⁇ I2_th
  • the control device 4 proceeds to step S309 and reduces the on / off frequency fpwm by the frequency change width ⁇ f. After that, the process ends.
  • the reduced on / off frequency fpwm is reflected in the pulse width modulation control during execution.
  • the processing of the flowchart of FIG. 8 may be performed.
  • the processing of steps S307 to S309 of FIG. 10 may be performed.
  • Control behavior will be described with reference to the time chart shown in FIG. In FIG. 11, the secondary current I2 is shown as an absolute value. Since the time t61 to the time t62 in FIG. 11 is the same as the time t1 to the time t2 in FIG. 4, the description thereof will be omitted.
  • the secondary current I2 (absolute value) increases stepwise from zero, and then gradually decreases as the magnetic energy stored in the iron core decreases.
  • the detection value of the secondary current I2 became smaller than the lower limit threshold value I2_thL, so that the control device 4 changed the drive signal S_sw2 to the second switching element 2 from off (0) to on (1). It is switched and the second primary winding 3b is energized. After the start of energization, the secondary current I2 gradually increases.
  • the control device 4 turned on the execution determination information S_PWM of the pulse width modulation control (1) and started the pulse width modulation control. ing. Since the control device 4 starts from the on period at the start of the pulse width modulation control, the drive signal S_sw1 to the first switching element 1 is turned on (1) at time t64. After the first switching element 1 is turned on, the secondary current I2 decreases.
  • the control device 4 determines the detected value of the secondary current I2 based on the deviation between the maximum value of the secondary current I2 detected at time t64 and the minimum value of the secondary current I2 detected at time t65.
  • the amplitude ⁇ I2 is calculated, and since the amplitude ⁇ I2 is larger than the target amplitude ⁇ I2_th, the on / off frequency fpwm is increased.
  • the target amplitude ⁇ I2_th is set to the deviation between the upper limit threshold value I2_thH and the lower limit threshold value I2_thL.
  • the amplitude ⁇ I2 of the detected value of the secondary current I2 is larger than the target amplitude ⁇ I2_th, so the on / off frequency fpwm is gradually increased.
  • the amplitude ⁇ I2 of the detected value of the secondary current I2 became smaller than the target amplitude ⁇ I2_th, so that the on / off frequency fpwm was decreased, and then the on / off frequency fpwm was repeatedly increased and decreased to be secondary.
  • the amplitude ⁇ I2 of the detected value of the current I2 is maintained near the target amplitude ⁇ I2_th.
  • the control device 4 has turned off the second switching element 2, so that the second switching element 2 is switched from on to off, and the execution determination information S_PWM of the pulse width modulation control is displayed. It is turned off, the pulse width modulation control is stopped, and the first switching element 1 is turned off.
  • the on / off frequency of the pulse width modulation control of the first switching element 1 is changed according to the detected value of the secondary current I2, so that the secondary current I2 can be accurately maintained within the target range, and improvement in ignitability and suppression of increase in electrode wear can be achieved in a well-balanced manner.
  • control device 4 In the third embodiment, the case where the control device 4 always changes the on / off frequency of the pulse width modulation control according to the detected value of the secondary current I2 has been described as an example. However, the control device 4 does not always need to be controlled by using the detected value of the secondary current I2. For example, the control device 4 determines the operation in one ignition cycle in advance and in the next ignition cycle. May turn on / off the first switching element 1 according to a predetermined operation regardless of the detected value of the secondary current I2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

L'invention concerne un dispositif d'allumage permettant d'augmenter de manière appropriée un courant secondaire au moyen de la mise sous tension d'un second enroulement primaire pendant une période de décharge, de sorte que le courant secondaire n'augmente pas de manière excessive ou ne chute pas de manière excessive. Dans le dispositif d'allumage (10), après mise sous tension d'un premier élément de commutation (1), le premier élément de commutation (1) est mis hors tension, produisant une décharge par étincelles dans une bougie d'allumage (5) ; pendant la décharge par étincelles, un second élément de commutation (2) est mis sous tension ; et pendant que le second élément de commutation (2) est mis sous tension, le premier élément de commutation (1) est mis sous/hors tension.
PCT/JP2019/019038 2019-05-14 2019-05-14 Dispositif d'allumage WO2020230255A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2021519092A JP7055243B2 (ja) 2019-05-14 2019-05-14 点火装置
PCT/JP2019/019038 WO2020230255A1 (fr) 2019-05-14 2019-05-14 Dispositif d'allumage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2019/019038 WO2020230255A1 (fr) 2019-05-14 2019-05-14 Dispositif d'allumage

Publications (1)

Publication Number Publication Date
WO2020230255A1 true WO2020230255A1 (fr) 2020-11-19

Family

ID=73289851

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/019038 WO2020230255A1 (fr) 2019-05-14 2019-05-14 Dispositif d'allumage

Country Status (2)

Country Link
JP (1) JP7055243B2 (fr)
WO (1) WO2020230255A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021046857A (ja) * 2019-09-12 2021-03-25 三菱電機株式会社 点火装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6463658A (en) * 1987-09-03 1989-03-09 Nippon Denso Co Ignition device for internal combustion engine
JP2018178997A (ja) * 2017-04-20 2018-11-15 株式会社デンソー 内燃機関用点火システム
WO2018229883A1 (fr) * 2017-06-14 2018-12-20 日立オートモティブシステムズ阪神株式会社 Dispositif d'allumage de moteur à combustion interne

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6463658A (en) * 1987-09-03 1989-03-09 Nippon Denso Co Ignition device for internal combustion engine
JP2018178997A (ja) * 2017-04-20 2018-11-15 株式会社デンソー 内燃機関用点火システム
WO2018229883A1 (fr) * 2017-06-14 2018-12-20 日立オートモティブシステムズ阪神株式会社 Dispositif d'allumage de moteur à combustion interne

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021046857A (ja) * 2019-09-12 2021-03-25 三菱電機株式会社 点火装置

Also Published As

Publication number Publication date
JPWO2020230255A1 (ja) 2021-10-14
JP7055243B2 (ja) 2022-04-15

Similar Documents

Publication Publication Date Title
JP6430049B2 (ja) 内燃機関のための多火花点火システムを制御する方法および装置
JP6330366B2 (ja) 点火装置
WO2015156296A1 (fr) Système d'allumage
CN112204246B (zh) 内燃机的点火装置
JP6820080B2 (ja) 点火システムを制御する方法および装置
US10364787B2 (en) Discharge stopping device
WO2019044691A1 (fr) Dispositif d'allumage
CN108350851B (zh) 用于控制点火***的方法和装置
JP7055243B2 (ja) 点火装置
JP2009293474A (ja) 内燃機関の点火装置
JP6337586B2 (ja) 点火装置
JP6563699B2 (ja) 点火制御装置
JP2008106723A (ja) 内燃機関の点火制御装置
JP6735877B1 (ja) 点火装置
JP6297899B2 (ja) 点火装置
JP5900384B2 (ja) 点火装置
JP2020139445A (ja) 内燃機関用点火装置
JP6401011B2 (ja) 内燃機関用多重点火装置
JP6928152B1 (ja) 点火装置
JP6884243B2 (ja) 点火装置
JP6531841B2 (ja) 点火装置
JP6375177B2 (ja) 内燃機関用点火コイル
JP2015200266A (ja) 点火装置
JP4893477B2 (ja) 内燃機関用の点火装置
JP2001193616A (ja) 内燃機関用点火装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19929011

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2021519092

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19929011

Country of ref document: EP

Kind code of ref document: A1