WO2020208958A1 - 点火制御装置 - Google Patents

点火制御装置 Download PDF

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Publication number
WO2020208958A1
WO2020208958A1 PCT/JP2020/007586 JP2020007586W WO2020208958A1 WO 2020208958 A1 WO2020208958 A1 WO 2020208958A1 JP 2020007586 W JP2020007586 W JP 2020007586W WO 2020208958 A1 WO2020208958 A1 WO 2020208958A1
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WO
WIPO (PCT)
Prior art keywords
signal
ignition
level
circuit
energy input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/007586
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English (en)
French (fr)
Japanese (ja)
Inventor
将嗣 入江
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
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 Denso Corp filed Critical Denso Corp
Priority to CN202080027790.6A priority Critical patent/CN114041011B/zh
Priority to DE112020001842.3T priority patent/DE112020001842T9/de
Publication of WO2020208958A1 publication Critical patent/WO2020208958A1/ja
Priority to US17/495,167 priority patent/US11378051B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • F02P3/04—Layout of circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • F02P3/04—Layout of circuits
    • F02P3/0407—Opening or closing the primary coil circuit with electronic switching means
    • F02P3/0435—Opening or closing the primary coil circuit with electronic switching means with semiconductor devices
    • F02P3/0442—Opening or closing the primary coil circuit with electronic switching means with semiconductor devices using digital techniques
    • 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
    • F02P15/08—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 multiple-spark ignition, i.e. ignition occurring simultaneously at different places in one engine cylinder or in two or more separate engine cylinders
    • 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
    • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
    • F02P17/12—Testing characteristics of the spark, ignition voltage or current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • F02P3/04—Layout of circuits
    • F02P3/05—Layout of circuits for control of the magnitude of the current in the ignition coil
    • 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
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
    • F02P5/15—Digital data processing
    • F02P5/1502—Digital data processing using one central computing unit

Definitions

  • the ignition control device in a spark ignition type vehicle engine is equipped with an ignition device in which an ignition coil having a primary coil and a secondary coil is connected to an ignition plug provided for each cylinder, and becomes a secondary coil when the power to the primary coil is cut off. A high voltage is applied to generate a spark discharge. Further, in order to improve the ignitability of the air-fuel mixture due to the spark discharge, a means for inputting the discharge energy after the start of the spark discharge is provided.
  • the ignition device disclosed in Patent Document 1 has two energy supply means, a main ignition circuit and an energy input circuit, and a common signal line is provided in one of the systems, so that the output terminal on the control side is insufficient. Etc. are suppressed.
  • One end of the common signal line is connected to the output terminal on the control side, and the other end is branched in the middle, and each branched signal line is an energy input circuit provided for each cylinder. Each is connected. In this way, the energy input of a plurality of cylinders can be controlled by adding one signal line.
  • Patent Document 1 a branch connector and a branch line for branching a common signal line in the middle are provided for each cylinder. Therefore, as the number of cylinders increases, the wiring becomes complicated, the branch portion becomes large in order to ensure the reliability of the branch portion, and the physique tends to become large. Further, since at least a plurality of signals for main ignition and energy input are transmitted, noise or the like may be generated by inputting signals during ignition operation, and a noise filter is used to avoid the influence. Etc. may be required.
  • the signal lines connecting the devices are further integrated to reduce the number of connector terminals and connection ports, and the ignition operation is suppressed from being affected by signal transmission, etc., and a noise filter or the like is added. It is desired to eliminate the need for and simplify the system configuration.
  • the present disclosure is to provide a compact and high-performance ignition control device capable of transmitting and receiving signals for performing a main ignition operation and an energy input operation by using fewer signal lines.
  • An ignition coil that generates discharge energy in the secondary coil connected to the spark plug by increasing or decreasing the primary current flowing through the primary coil.
  • a main ignition circuit unit that controls the energization of the primary coil and performs a main ignition operation that causes a spark discharge in the spark plug.
  • An ignition control device including an energy input circuit unit that performs an energy input operation in which a current having the same polarity is superimposed on a secondary current flowing through the secondary coil by the main ignition operation.
  • the ignition control signal which is a signal obtained by integrating the main ignition signal for controlling the main ignition operation, the energy input signal for controlling the energy input operation, and the target secondary current command signal, is received and received. It is equipped with a signal separation circuit that separates the signals contained in the signal.
  • the standby time elapses starting from the time when the signal level of the ignition control signal first changes from the first level to the second level, and the signal level of the ignition control signal is the second level.
  • the time point is regarded as the start of the main ignition signal, and when the signal level of the ignition control signal becomes the first level after that time, the time point is regarded as the end of the main ignition signal.
  • the main ignition circuit unit is in an ignition control device that energizes the primary coil at the start of the main ignition signal and shuts off the energization of the primary coil at the end of the main ignition signal.
  • the ignition control signal received by the signal separation circuit unit includes information on three signals, a main ignition signal, an energy input signal, and a target secondary current command signal, and is based on the signal waveform. It can be separated into each signal.
  • the main ignition signal is set on the condition that the signal level is at the second level when a predetermined waiting time elapses after the signal level first changes from the first level to the second level, and thereafter. It is generated on condition that it reaches the first level.
  • the main ignition circuit unit performs an energization operation on the primary coil based on the generated main ignition signal, and performs a main ignition operation. When the energy input operation is performed following the main ignition operation, the energy input signal and the target secondary current command signal are further separated and generated in the signal separation circuit unit.
  • a plurality of signals for main ignition and energy input can be combined into one ignition control signal and transmitted by one signal line, a plurality of signal lines can be provided for each cylinder, or a common signal line can be provided. There is no need to branch from. Further, since the signal for the energy input operation can be transmitted before the start of the main ignition operation, the energization operation for the main ignition is less affected by noise. Therefore, efficient ignition control becomes possible while reducing the number of wirings, the number of connectors, and the number of connection ports to suppress the complexity and size of the system configuration.
  • FIG. 1 is a circuit configuration diagram of the ignition control device according to the first embodiment.
  • FIG. 2 is a waveform diagram of the ignition control signal received by the ignition control device according to the first embodiment.
  • FIG. 3 is a circuit configuration diagram of a signal separation circuit unit constituting the ignition device of the ignition control device according to the first embodiment.
  • FIG. 4 is a time chart diagram showing the relationship between the ignition control signal and the main ignition and energy input gate signals in the first embodiment.
  • FIG. 5 is a time chart diagram showing changes in the main ignition operation and the energy input operation based on various signals generated in the ignition control device in the first embodiment.
  • FIG. 1 is a circuit configuration diagram of the ignition control device according to the first embodiment.
  • FIG. 2 is a waveform diagram of the ignition control signal received by the ignition control device according to the first embodiment.
  • FIG. 3 is a circuit configuration diagram of a signal separation circuit unit constituting the ignition device of the ignition control device according to the first embodiment.
  • FIG. 4 is a time chart diagram showing the relationship between the
  • FIG. 6 is a circuit configuration diagram of a waveform shaping circuit constituting the ignition device according to the first embodiment.
  • FIG. 7 is a time chart diagram showing the relationship between the ignition control signal and various signals generated in the waveform shaping circuit in the first embodiment.
  • FIG. 8 is a circuit configuration diagram of the IGT generation circuit constituting the ignition device according to the first embodiment.
  • FIG. 9 is a time chart diagram showing the relationship between the ignition control signal and various signals generated in the IGT generation circuit in the first embodiment.
  • FIG. 10 is a circuit configuration diagram of the IGW generation circuit constituting the ignition device according to the first embodiment.
  • FIG. 11 is a time chart diagram showing the relationship between the ignition control signal and various signals generated in the IGW generation circuit in the first embodiment.
  • FIG. 12 is a time chart diagram showing the relationship between the signal generated by the IGA generation circuit constituting the ignition device and the energy input operation in the first embodiment.
  • FIG. 13 is a circuit configuration diagram of the reset circuit constituting the waveform shaping circuit according to the first embodiment.
  • FIG. 14 is a time chart diagram showing the relationship between the reset signal generated in the reset circuit and various signals in the first embodiment.
  • FIG. 15 is a time chart diagram showing the relationship between the ignition control signal and various signals generated in the signal separation circuit unit, and the transition of the main ignition operation and the energy input operation in the second embodiment.
  • FIG. 16 is a time chart diagram showing the relationship between the ignition control signal, various signals generated in the signal separation circuit unit, and the standby time in the third embodiment.
  • FIG. 17 is a time chart diagram comparing the relationship between the ignition control signal and various signals generated in the signal separation circuit unit in the fourth embodiment with the standby time variable depending on the engine operating conditions.
  • FIG. 18 is a diagram showing the relationship between the engine operating conditions and the standby time set in the signal separation circuit unit in the fourth embodiment.
  • FIG. 19 is a flowchart showing the procedure of the main ignition operation and the energy input operation performed by the ignition control device in the fifth embodiment.
  • FIG. 20 is a flowchart showing a procedure of a main ignition operation and an energy input operation based on FIG. 19 in the fifth embodiment in comparison with the first to third embodiments.
  • FIG. 21 is a time chart diagram showing an example of the main ignition operation and the energy input operation performed by the ignition control device in the fifth embodiment for the first embodiment.
  • FIG. 22 is a circuit configuration diagram of the IGT generation circuit constituting the ignition device in the sixth embodiment.
  • FIG. 23 is a time chart diagram showing the relationship between the ignition control signal and various signals generated in the IGT generation circuit in the sixth embodiment.
  • FIG. 24 is a circuit configuration diagram of the IGT generation circuit constituting the ignition device in the sixth embodiment.
  • FIG. 25 is a time chart diagram showing the relationship between the ignition control signal and various signals generated in the IGT generation circuit in the sixth embodiment.
  • FIG. 26 is a circuit configuration diagram of the IGW generation circuit constituting the ignition device in the sixth embodiment.
  • FIG. 27 is a time chart diagram showing the relationship between the ignition control signal and various signals generated in the IGW generation circuit in the sixth embodiment.
  • FIG. 28 is a time chart diagram showing the relationship between the signals generated by the IGA generation circuit constituting the ignition device and various signals in the sixth embodiment.
  • FIG. 29 is a time chart diagram showing the relationship between the signals generated by the IGA generation circuit constituting the ignition device and various signals in the sixth embodiment.
  • FIG. 30 is a circuit configuration diagram of the ignition control device according to the seventh embodiment.
  • the first embodiment according to the ignition control device will be described with reference to FIGS. 1 to 14.
  • the ignition control device 1 is applied to an internal combustion engine such as an in-vehicle spark ignition type engine to control ignition of a spark plug P provided for each cylinder.
  • the ignition control device 1 includes an ignition device 10 provided with an ignition coil 2, a main ignition circuit unit 3, an energy input circuit unit 4, and a signal separation circuit unit 5, and an ignition that gives an ignition command to the ignition device 10.
  • An electronic control device for an engine hereinafter, abbreviated as an engine ECU; Electronic Control Unit 100 as a control signal transmission unit is provided.
  • the ignition coil 2 generates discharge energy in the secondary coil 22 connected to the spark plug P by increasing or decreasing the primary current I1 flowing through the primary coil 21.
  • the main ignition circuit unit 3 controls the energization of the ignition coil 2 to the primary coil 21 to perform a main ignition operation that causes a spark discharge in the spark plug P.
  • the energy input circuit unit 4 performs an energy input operation in which a current of the same polarity is superimposed on the secondary current I2 flowing through the secondary coil 22 by the main ignition operation.
  • the primary coil 21 has, for example, a main primary coil 21a and a sub-primary coil 21b, and the energy input circuit unit 4 can control the energy input operation by controlling the energization of the sub-primary coil 21b. it can.
  • the signal separation circuit unit 5 receives the ignition control signal IG transmitted from the engine ECU 100 and separates the signal included in the ignition control signal IG.
  • the ignition control signal IG is a signal in which the main ignition signal IGT that controls the main ignition operation, the energy input signal IGW that controls the energy input operation, and the target secondary current command signal IGA are integrated. Is received as one signal or a combination of two signals.
  • the ignition control signal IG is separated into each signal again in the signal separation circuit unit 5, and for example, the main ignition signal IGT is separated and generated, so that the main ignition operation can be performed.
  • the signal separation circuit unit 5 generates the main ignition signal IGT based on the signal level of the ignition control signal IG.
  • the waiting time twait elapses starting from the time when the signal level first changes from the first level (for example, L level) to the second level (for example, H level).
  • the signal level of the ignition control signal IG is the second level (for example, H level)
  • that time is set as the start of the main ignition signal IGT
  • the signal level of the ignition control signal IG is the first level after that time.
  • (for example, L level) is reached, that time is defined as the end of the main ignition signal IGT.
  • the standby time twait is a preset time for generating the main ignition signal IGT from the ignition control signal IG, and as will be described later, the main ignition signal is generated from the switching (for example, rising) of the signal level of the ignition control signal IG. It corresponds to the period until the signal level of the IGT is switched (for example, rising).
  • a main ignition operation is performed in which the primary coil 21 is energized at the start of the main ignition signal IGT and the primary coil 21 is cut off at the end of the main ignition signal IGT.
  • the signal level of the ignition control signal IG is represented by two voltage levels, H level and L level. When the threshold voltage reaches or is higher than the preset threshold voltage, the H level is reached and the threshold voltage is not reached. Is the L level. In the present embodiment, the first level corresponds to the L level, and the second level corresponds to the H level.
  • the ignition control signal IG is generated as a signal composed of a pulsed first signal IG1 and a second signal IG2.
  • the engine ECU 100 generates an ignition control signal IG that combines these two signals IG1 and IG2 every one combustion cycle (for example, 720 ° CA) and transmits the ignition control signal IG to the signal separation circuit unit 5 prior to the main ignition operation.
  • the first signal IG1 and the second signal IG2 of the ignition control signal IG are distinguished from each other by, for example, the first input signal input from the engine ECU 100 to the ignition device 10 after the operation of the ignition control device 1 is started. , The first signal IG1 and the next input signal is the second signal IG2. By repeating the same operation for the subsequent input signals, the input signals can be identified.
  • the signal separation circuit unit 5 has a circuit that receives the ignition control signal IG and separates the three signals included in the ignition control signal IG from the received ignition control signal IG. .. Specifically, as shown in FIG. 4, the waiting time twait has elapsed from the detection start time (that is, rising edge) of the first signal IG1, and the signal level of the second signal IG2 is the second level (that is, H). Level), the main ignition signal IGT is generated at that time as the start of the main ignition signal IGT, and the detection end time (that is, falling) of the second signal IG2 is regarded as the end of the main ignition signal IGT. It has a main ignition signal generation circuit (hereinafter, referred to as an IGT generation circuit) 52.
  • the IGT generation circuit 52 may include a circuit that generates a waiting time twait.
  • the signal separation circuit unit 5 generates an energy input signal IGW based on the pulse waveform information of the first signal IG1 and the second signal IG2, and the target secondary current command is based on the pulse waveform information of the first signal IG1.
  • the signal IGA can be generated.
  • the pulse waveform information is information such as a period or interval determined based on the rise or fall of one or more pulses, and is a period of rise or fall of a pulse, an interval of rise or fall of a plurality of pulses, or the like. Including.
  • an energy input signal generation circuit (hereinafter, referred to as an IGW generation circuit) that generates an energy input signal IGW based on a rising interval t IGW_IN as a detection interval between the first signal IG1 and the second signal IG2. ) 53.
  • a target secondary current command signal generation circuit (hereinafter referred to as an IGA generation circuit) 54 for generating a target secondary current command signal IGA based on a rising period t IGA_IN as a detection period of the first signal IG1 is provided. be able to.
  • the ignition control device 1 operates the main ignition circuit unit 3 based on the main ignition signal IGT to perform the main ignition operation. Further, after the main ignition, the energy input circuit unit 4 is operated based on the energy input signal IGW to perform the energy input operation to continue the spark discharge. The energy input in this continuous discharge is indicated by the target secondary current command signal IGA.
  • the ignition control device 1 further includes a feedback control unit 6 that feedback-controls the secondary current I2, and the secondary current I2 flowing through the secondary coil 22 of the ignition coil 2 based on the target secondary current command signal IGA. Feedback control is performed so that is the target secondary current value I2tgt.
  • the engine to which the ignition control device 1 of the present embodiment is applied is, for example, a 4-cylinder engine, and spark plugs P corresponding to each cylinder (for example, shown as P # 1 to P # 4 in FIG. 1). Is provided, and an ignition device 10 is provided corresponding to each of the spark plugs P.
  • An ignition control signal IG is transmitted from the engine ECU 100 to each ignition device 10.
  • the spark plug P has a known configuration including an opposing center electrode P1 and a ground electrode P2, and the space formed between the tips of both electrodes is a spark gap G. Discharge energy generated by the ignition coil 2 is supplied to the spark plug P based on the ignition control signal IG, spark discharge occurs in the spark gap G, and the air-fuel mixture in the engine combustion chamber (not shown) can be ignited. It becomes.
  • the energization of the ignition coil 2 is controlled based on the main ignition signal IGT, the energy input signal IGW, and the target secondary current command signal IGA included in the ignition control signal IG.
  • the main primary coil 21a or the secondary primary coil 21b serving as the primary coil 21 and the secondary coil 22 are magnetically coupled to each other to form a known step-up transformer.
  • One end of the secondary coil 22 is connected to the center electrode P1 of the spark plug P, and the other end is grounded via the first diode 221 and the secondary current detection resistor R1.
  • the first diode 221 is arranged so that the anode terminal is connected to the secondary coil 22 and the cathode terminal is connected to the secondary current detection resistor R1 to regulate the direction of the secondary current I2 flowing through the secondary coil 22.
  • the secondary current detection resistor R1 constitutes a feedback control unit 6 together with a secondary current feedback circuit (for example, shown as I2F / B in FIG. 1) 61, which will be described in detail later.
  • the main primary coil 21a and the secondary primary coil 21b are connected in series and are connected in parallel to a DC power source B such as a vehicle battery. Specifically, an intermediate tap 23 is provided between one end of the main primary coil 21a and one end of the secondary primary coil 21b, and a power supply line L1 leading to the DC power supply B is connected to the intermediate tap 23. ..
  • the other end of the main primary coil 21a is grounded via a switching element for main ignition (hereinafter, abbreviated as main ignition switch) SW1
  • the other end of the secondary primary coil 21b is a switching element for continuing discharge (hereinafter, hereinafter abbreviated as). It is grounded via SW2 (abbreviated as discharge continuation switch).
  • the battery voltage can be applied to the primary coil 21a or the secondary primary coil 21b when the main ignition switch SW1 or the discharge continuation switch SW2 is driven on.
  • the main ignition switch SW1 constitutes the main ignition circuit unit 3
  • the discharge continuation switch SW2 constitutes the energy input circuit unit 4.
  • the ignition coil 2 is integrally formed by winding the primary coil 21 and the secondary coil 22 around, for example, a bobbin for the primary coil and a bobbin for the secondary coil arranged around the core 24.
  • a predetermined high voltage corresponding to the number of turns ratio can be obtained. , Can be generated in the secondary coil 22.
  • the main primary coil 21a and the secondary primary coil 21b are wound so that the directions of the magnetic flux generated when the DC power supply B is energized are opposite to each other, and the number of turns of the secondary primary coil 21b is larger than the number of turns of the main primary coil 21a. Set less.
  • the superposition magnetic flux in the same direction is generated by the energization of the sub-primary coil 21b and is superimposed. The discharge energy can be increased.
  • the main ignition circuit unit 3 includes a main ignition switch SW1 and a switch drive circuit (hereinafter, referred to as a main ignition drive circuit) 31 for main ignition operation that drives the main ignition switch SW1 on and off.
  • the main ignition switch SW1 is a voltage-driven switching element, for example, an IGBT (that is, an insulated gate bipolar transistor), and the collector is controlled by controlling the gate potential according to the gate signal IGBT_gate input to the gate terminal. Conduction or disconnection between the terminal and the emitter terminal.
  • the collector terminal of the main ignition switch SW1 is connected to the other end of the main primary coil 21a, and the emitter terminal is grounded.
  • the main ignition signal IGT output from the signal separation circuit unit 5 is input to the input terminal of the main ignition drive circuit 31 via the output signal line L2.
  • the main ignition drive circuit 31 drives the main ignition switch SW1 in response to the main ignition signal IGT.
  • the main ignition drive circuit 31 (see, for example, FIG. 4) generates a gate signal IGBT_gate corresponding to the main ignition signal IGBT, and drives the main ignition switch SW1 on or off at a predetermined timing.
  • the energy input circuit unit 4 includes a discharge continuation switch SW2 and a sub-primary coil control circuit 41 that outputs a drive signal for driving the discharge continuation switch SW2 on and off to control energization of the sub-primary coil 21b. It is composed. Further, a switching element (hereinafter, abbreviated as a recirculation switch) SW3 for opening and closing the recirculation path L11 connected to the sub-primary coil 21b is provided, and the on / off operation is performed by a drive signal from the sub-primary coil control circuit 41. There is.
  • a switching element hereinafter, abbreviated as a recirculation switch
  • the discharge continuation switch SW2 and the recirculation switch SW3 are voltage-driven switching elements, for example, MOSFETs (that is, field effect transistors), and their gate potentials are controlled according to the gate signals MOS_gate1 and MOS_gate2 input to the gate terminals, respectively. By doing so, the connection between the drain terminal and the source terminal is conducted or cut off.
  • the drain terminal of the discharge continuation switch SW2 is connected to the other end of the secondary primary coil 21b, and the source terminal is grounded.
  • the reflux path L11 is provided between the other end of the secondary primary coil 21b (that is, the side opposite to the main primary coil 21a) and the power supply line L1.
  • the drain terminal of the recirculation switch SW3 is connected to the connection point between the other end of the secondary primary coil 21b and the discharge continuation switch SW2, and the source terminal is connected to the power supply line L1 via the second diode 11.
  • the power supply line L1 is provided with a third diode 12 between the connection point with the return path L11 and the DC power supply B.
  • the second diode 11 has a forward direction toward the power supply line L1
  • the third diode 12 has a forward direction toward the primary coil 21.
  • the energy input signal IGW output from the signal separation circuit unit 5 and the target secondary current command signal IGA are input to the input terminal of the secondary primary coil control circuit 41 via the output signal lines L3 and L4. .. Further, a feedback signal SFB is input to the sub-primary coil control circuit 41 from the secondary current feedback circuit 61 of the feedback control unit 6, and further, a battery voltage signal SB is input from the power supply line L1.
  • the secondary primary coil control circuit 41 (see, for example, FIG. 4) generates gate signals MOS_gate1 and MOS_gate2, and drives the discharge continuation switch SW2 and the recirculation switch SW3. At this time, during the energy input period t IGW indicated by the energy input signal IGW, the gate signal MOS_gate2 is turned on and the target secondary current value I2tgt indicated by the target secondary current command signal IGA is maintained. The gate signal MOS_gate1 is driven on and off (see, for example, FIG. 5).
  • the secondary current feedback circuit 61 outputs the detected value of the secondary current I2 based on the secondary current detection resistor R1 as a feedback signal SFB, and the secondary primary coil control circuit 41 uses the detected value of the secondary current I2 as the detected value.
  • the discharge continuation switch SW2 and the recirculation switch SW3 are driven based on the comparison result with the target secondary current value I2tgt. At that time, it may be determined whether or not the energy input operation is possible based on the battery voltage signal SB.
  • the gate signal MOS_gate2 rises and the reflux switch SW3 is turned on in synchronization with this.
  • the gate signal MOS_gate1 rises and the discharge continuation switch SW2 is turned on.
  • the secondary current I2 is superimposed by the current I NET flowing through the secondary primary coil 21b.
  • the target secondary current value I2tgt serves as a lower limit threshold value (absolute value) for turning on the discharge continuation switch SW2, and is instructed by the target secondary current command signal IGA.
  • the target secondary current command signal IGA is set as a function f (t IGA_IN ) based on the rising period t IGA_IN of the first signal IG1 before the main ignition operation is started.
  • an upper limit threshold value (absolute value) for turning off the discharge continuation switch SW2 is set corresponding to the lower limit threshold value. Therefore, when the secondary current I2 (absolute value) rises again due to the energy supply and reaches a predetermined upper limit threshold value, the gate signal MOS_gate1 falls and the discharge continuation switch SW2 is turned off. In this way, the discharge continuation switch SW2 is repeatedly turned on and off according to the gate signal MOS_gate1, so that the secondary current I2 is maintained in the vicinity of the target secondary current value I2tgt.
  • the predetermined delay period t fil is appropriately set so that, for example, the energy input operation is performed after the secondary current I2 flowing due to the main ignition operation drops to some extent. This is for outputting the energy input signal IGW, which indicates the execution period of the energy input operation, at a predetermined timing after the spark discharge is started by the main ignition operation, and the spark discharge is effectively performed by the energy input. Be maintained.
  • the ignition control signal IG includes the first signal IG1 and the second signal IG2, and the previous signal output at the rising edge of the ignition control signal IG is set as the first signal IG1 and the first signal IG1.
  • the latter signal which is output after the fall of, is referred to as the second signal IG2.
  • the ignition control signal IG sets the energy input period t IGW by the rise interval t IGW_IN , which is the length from the rise of the first signal IG1 to the rise of the second signal IG2.
  • the target secondary current value I2tgt is set by the rising period t IGA_IN , which is the length from the rising edge to the falling edge of the first signal IG1.
  • the period from the rise to the fall of the ignition control signal IG is the period from the rise of the first signal IG1 to the fall of the second signal IG2, and the length of the standby time twait and the rise period of the main ignition signal IGT.
  • the length is the sum of the length of t IGT .
  • the ignition control signal IG is output at a timing earlier than the rise of the main ignition signal IGT by the waiting time twait.
  • the ignition control signal IG falls at the same time as the main ignition signal IGT, and no signal is transmitted from the engine ECU 100 thereafter.
  • the signal separation circuit unit 5 includes a waveform shaping circuit 51 for waveform-shaping the ignition control signal IG, an IGT generation circuit 52 for generating the main ignition signal IGT, and an IGW generation circuit 53 for generating the energy input signal IGW. It has an IGA generation circuit 54 that generates a target secondary current command signal IGA. In addition, a reset signal generation circuit 55 that generates a reset signal RES is provided.
  • the ignition control signal IG is a composite signal obtained by combining the main ignition signal IGT, the energy input signal IGW, and the target secondary current command signal IGA.
  • the waveform shaping in FIG. 3 is performed. Filtering is performed in the circuit 51. As a result, it is output to the IGT generation circuit 52 and the reset signal generation circuit 55 as a rectangular wave signal 1a including the first signal IG1 and the second signal IG2 having a rectangular waveform from which noise has been removed.
  • the reset signal RES from the reset signal generation circuit 55 is output to the IGT generation circuit 52, the IGW generation circuit 53, and the IGA generation circuit 54, respectively.
  • the signal IGT_DCT for generating the main ignition signal IGT the signal IGW_DCT for generating the energy input signal IGW, and the signal IGT_DCT for generating the target secondary current command signal IGA are Each is generated.
  • These signals IGT_DCT, signal IGW_DCT, and signal IGA_DCT are output to the IGT generation circuit 52, the IGW generation circuit 53, and the IGA generation circuit 54, respectively.
  • the waveform shaping circuit 51 includes a first comparator 511, a low-pass filter 512, a first D flip-flop 513a to a third D flip-flop 513c, a first and circuit 514a to a fourth and circuit 514d, and a first It is composed of an inverter circuit 515a to a third inverter circuit 515c.
  • a reference potential Vth1 serving as a threshold value is applied to the negative input terminal, and when the ignition control signal IG is input to the positive input terminal, an output signal based on the comparison result is transmitted from the output terminal. It is input to the low-pass filter 512.
  • the low-pass filter 512 has a known filter configuration including a resistor R1 and a capacitor C1.
  • the first comparator 511 raises or lowers the output according to the comparison result between the ignition control signal IG and the reference potential Vth1, and shapes it into an H level or L level binary signal. ..
  • the ignition control signal IG is waveform-shaped into a rectangular wave shape having rising and falling edges (that is, the rectangular wave signal 1a in the figure).
  • the waveform-shaped rectangular wave signal 1a is input to the first D flip-flop 513a.
  • the first D flip-flop 513a is a circuit for detecting the first rise of the ignition control signal IG and outputting it as the signal IGT_DCT.
  • the first D flip-flop 513a corresponds to an H level when a rectangular wave signal 1a is input to a clock terminal (hereinafter referred to as a CLK terminal) and a power supply is connected to a data terminal (hereinafter referred to as a D terminal). The potential is being supplied.
  • the signal IGT_DCT output from the output terminal rises to the H level.
  • the reset signal RES from the reset signal generation circuit 55 is input to the reset terminal (hereinafter referred to as RES terminal) of the first D flip-flop 513a, and the reset signal RES is switched from H level to L level. Synchronously, the latch is reset.
  • the reset signal RES starts from the H level to L after the elapse of a predetermined reset period treswait from the second fall of the rectangular wave signal 1a (that is, corresponding to the fall of the second signal IG2). Switch to level.
  • the signal IGT_DCT which is a detection signal of the rise of the ignition control signal IG (that is, the rise of the first signal IG1), is output from the first D flip-flop 513a and reset. It is reset at the falling edge of the signal RES.
  • the second D flip-flop 513b has the same configuration as the first D flip-flop 513a, and the ignition control signal IG rises for the second time (that is, the second rise) based on the signal input from the first AND circuit 514a to the CLK terminal. This is a circuit for detecting the rising edge of the two-signal IG2).
  • the output from the second D flip-flop 513b is input to the second AND circuit 514b via the first inverter circuit 515a, and is output as a signal IGW_DCT for detecting the first rise and fall of the ignition control signal IG. Will be done.
  • the third D flip-flop 513c has the same configuration as the first D flip-flop 513a, and ignition control is performed based on a signal input from the second AND circuit 514b to the CLK terminal via the second inverter circuit 515b. This is a circuit for detecting the first fall of the signal IG (that is, the fall of the first signal IG1).
  • the output from the third D flip-flop 513c is input to the fourth and circuit 514d via the third inverter circuit 515c, and is output as a signal IGA_DCT for detecting the first rise and fall of the ignition control signal IG. Will be done.
  • the reset signal RES from the reset signal generation circuit 55 is also input to the RES terminals of the second D flip-flop 513b and the third D flip-flop 513c, and the latch is reset at the same timing as the first D flip-flop 513a.
  • a rectangular wave signal 1a is input to one terminal, and a signal from the Q terminal of the 3D flip-flop 513c is input to the other terminal.
  • one terminal becomes H level at the first falling edge of the square wave signal 1a, and then the other terminal becomes H level at the second rising edge of the square wave signal 1a.
  • the H level signal is output to the CLK terminal of the second D flip-flop 513b at the same timing.
  • the output from the Q terminal becomes H level, and this output is input to one terminal of the second AND circuit 514b as a signal 1b inverted by the first inverter circuit 515a.
  • the signal 1b is a signal that has an H level in the initial state and becomes an L level at the second rise of the ignition control signal IG.
  • the signal IGT_DCT from the Q terminal of the first D flip-flop 513a is input to the other terminal of the second AND circuit 514b.
  • the second AND circuit 514b outputs the signal IGW_DCT which becomes the H level. That is, the signal IGW_DCT is a signal that rises at the timing when the signal IGT_DCT reaches the H level and falls at the timing when the signal 1b reaches the L level.
  • the signal IGT_DCT from the Q terminal of the first D flip-flop 513a is input to one terminal, and the square wave signal 1a is input to the other terminal via the second inverter circuit 515b. Has been done.
  • the third AND circuit 514c outputs an H level signal to the CLK terminal of the third D flip-flop 513c when the signal IGT_DCT is H level and the rectangular signal 1a is L level.
  • the output from the Q terminal becomes the H level, and is further input to one terminal of the fourth and circuit 514d as a signal 1c inverted via the third inverter circuit 515c.
  • the signal 1c is a signal that has an H level in the initial state and becomes an L level at the first fall of the ignition control signal IG.
  • the signal IGT_DCT from the Q terminal of the first D flip-flop 513a is input to the other terminal of the fourth and circuit 514d.
  • the signal IGA_DCT that becomes H level is output from the fourth and circuit 514d. That is, the signal IGA_DCT is a signal that rises at the timing when the signal IGT_DCT reaches the H level and falls at the timing when the signal 1b reaches the L level.
  • the IGT generation circuit 52 includes a standby time generation circuit (hereinafter referred to as a twait generation circuit) 521 for generating a standby time twait, an AND circuit 522, 523, and an inverter circuit 524.
  • the rectangular wave signal 1a and the signal IGT_DCT from the waveform shaping circuit 51 are input to the IGT generation circuit 52, and the twait generation circuit 521 generates a signal 2b confirming that the predetermined standby time twait is held.
  • the AND circuit 522 generates a main ignition signal IGT based on the signal 2b output from the twait generation circuit 521 and the rectangular wave signal 1a, and the AND circuit 523 generates the signal 2b output from the twait generation circuit 521.
  • a signal 2c based on the signal inverted by the inverter circuit 524 and the signal IGT_DCT is generated.
  • the twait generation circuit 521 is configured by using, for example, a counter circuit including a plurality of stages (N stages) of JK flip-flop circuits 525.
  • a power supply is connected to the J terminal and the K terminal, and a potential corresponding to the H level is supplied.
  • the signal 2a from the AND circuit 526 is input to the CLK terminal of the JK flip-flop circuit 525 of each stage, and the Q terminal of the JK flip-flop circuit 525 of each stage is the JK flip-flop circuit 525 of the next stage. It is connected to the J terminal and the K terminal of.
  • the Q terminal of the JK flip-flop circuit 525 in the final stage (Nth stage) is connected to the CLK terminal of the D flip-flop circuit 527.
  • the reset signal RES from the reset signal generation circuit 55 is input to the clear terminal (hereinafter referred to as the CLR terminal) of the JK flip-flop circuit 525 of each stage, and the reset signal RES switches from the H level to the L level. It will be reset in sync with.
  • a reset signal RES is input to the RES terminal of the D flip-flop circuit 527, and the reset signal is reset at the falling edge of the reset signal RES.
  • the signal IGT_DCT and the clock signal from the external clock generation circuit are input to the AND circuit 526, and when the clock signal rises after the rise of the signal IGT_DCT, the clock signal is sent to the JK flipflop circuit 525 of each stage.
  • the signal 2a is output in synchronization.
  • the signal 2a from the AND circuit 526 rises to the H level, and the counter operation is started.
  • the output 3c of the final stage JK flip-flop circuit 525 are all L. It is a level.
  • the output 3a of the first-stage JK flip-flop circuit 525 is inverted and input to the J terminal and the K terminal of the second-stage JK flip-flop circuit 525.
  • the second-stage JK flip-flop circuit 525 inverts the output 3b each time the output 3a of the first-stage JK flip-flop circuit 525 rises, and similarly signals to the next-stage and subsequent JK flip-flop circuits 525. Is transmitted.
  • the output 3c of the JK flip-flop circuit 525 in the final stage is inverted by the input from the previous stage. Then, when an H level signal is input to the CLK terminal of the D flip-flop circuit 527, the signal 2b output from the D flip-flop circuit 527 rises to the H level. At this time, the number of stages of the plurality of stages of the JK flip-flop circuit 525 is appropriately set so that the time corresponding to the predetermined standby time twait can be measured.
  • the main ignition signal IGT output from the AND circuit 522 rises to the H level after a predetermined waiting time twait from the rise of the square wave signal 1a because the signal 2b and the square wave signal 1a become the H level. After that, the main ignition signal IGT falls to the L level in synchronization with the fall of the rectangular wave signal 1a. Further, the signal 2c output from the AND circuit 523 has an H level during the period from the rise of the square wave signal 1a to the rise of the signal 2b because the inverted signal of the signal 2b and the signal IGT_DCT have the H level. This period corresponds to a predetermined waiting time twait, and when the main ignition signal IGT rises, the signal 2c falls to the L level.
  • a predetermined reset period treswait elapses from the fall of the rectangular wave signal 1a and the main ignition signal IGT, and the reset signal RES falls.
  • the latches of the JK flip-flop circuit 525 and the D flip-flop circuit 527 are reset as in the signal IGT_DCT. In this way, the main ignition signal IGT is generated with the output of the rectangular wave signal 1a.
  • the IGW generation circuit 53 detects, for example, the rising interval t IGW_IN of the signal IGW_DCT using the up-counter circuit 531 shown in FIG. 10, and uses the detected rising interval t IGW_IN to input energy. Generate a signal IGW.
  • the rise interval t IGW_IN may be set as it is as the energy input period t IGW , or a value obtained by multiplying the rise interval t IGW_IN (for example, 2 times or 1/2 times, etc.) using a predetermined coefficient. May be set as the energy input period t IGW .
  • the IGW generation circuit 53 includes, for example, a down counter circuit having the same structure as the up counter circuit 531.
  • the up-counter circuit 531 includes a plurality of stages (N stages) of a JK flip-flop circuit 532 and an AND circuit 533.
  • a power source is connected to the J terminal and the K terminal, and a potential corresponding to the H level is supplied.
  • the Q terminal is connected to the J terminal and the K terminal of the JK flip-flop circuit 532 of the second stage, and is also connected to the bus line Lb leading to the N-bit bit counter (IGW_COUNTER).
  • the Q terminal of the JK flip-flop circuit 532 of the second and subsequent stages is also connected to the J terminal and the K terminal of the JK flip-flop circuit 532 of the next stage, and is also connected to the bus line Lb.
  • a signal IGW_DCT and a clock signal from a clock generation circuit are input to the AND circuit 533.
  • the signal from the AND circuit 533 is input to the CLK terminal of the JK flip-flop circuit 532 of each stage.
  • the reset signal RES from the reset signal generation circuit 55 is input to the CLR terminal of the JK flip-flop circuit 532 of each stage, and is reset at the falling edge of the reset signal RES.
  • the signal from the AND circuit 533 rises to the H level, so that the counter operation by the up counter circuit 531 is performed. It will be started.
  • the output of the JK flip-flop circuit 532 of the first stage is L level, and the outputs of the JK flip-flop circuit 532 of the second and subsequent stages are all L level.
  • the output of the JK flip-flop circuit 532 of the first stage is inverted and output to the bus line Lb and the JK of the second stage. It is input to the J terminal and the K terminal of the flip-flop circuit 532.
  • the output from the JK flip-flop circuit 532 of the first stage is switched to the H level, and the output of the second and subsequent stages is maintained at the L level.
  • the signal is transmitted to the JK flip-flop circuit 532 in the subsequent stage, and the output is sequentially switched to the H level.
  • the length of the measured signal IGW_DCT is held as the rise interval t IGW_IN (that is, the interval from the first rise to the second rise of the rectangular wave signal 1a).
  • the IGW generation circuit 53 then raises the energy input signal IGW after a predetermined delay period t fil from the second fall of the rectangular wave signal 1a, and counts down the time corresponding to the held rise interval t IGW_IN . ..
  • the down counter circuit can have the same configuration as the up counter circuit 531. In this way, the energy input signal IGW is generated by outputting the H level signal during the energy input period t IGW after the main ignition signal IGT.
  • the IGA generation circuit 54 detects the rising period t IGA_IN of the signal IGA_DCT, and uses the detected rising period t IGA_IN to generate the target secondary current command signal IGA.
  • an up counter circuit having the same configuration as the up counter circuit 531 shown in FIG. 10 can be used in the same manner as the rising interval t IGW_IN described above.
  • the rise period t IGA_IN indicates the target secondary current value I2tgt (absolute value) in the energy input operation after the main ignition operation, as shown in Table 1 below. That is, the target secondary current value I2tgt is expressed on the rising period t IGA_IN function f (t IGA_IN), according to the length of the rising period t IGA_IN, target secondary current value I2tgt is variably set.
  • the target secondary current value I2tgt when t IGA_IN ⁇ 0.25 ms, the target secondary current value I2tgt is 60 mA, and when 0.25 ms ⁇ t IGA_IN ⁇ 0.75 ms, the target secondary current value I2 tgt is 90 mA, and 0.75 ms ⁇
  • the target secondary current value I2tgt can be set to 120 mA.
  • the target secondary current value I2tgt is set to 0 mA.
  • the secondary current feedback circuit 61 (see, for example, FIG. 1) outputs the gate signal MOS_gate1 and the gate signal MOS_gate2 from the secondary primary coil control circuit 4 based on the detected value of the secondary current I2, and discharges the current.
  • the continuation switch SW2 and the recirculation switch SW3 By controlling the continuation switch SW2 and the recirculation switch SW3 on and off, the secondary current I2 is maintained in the vicinity of the target secondary current value I2tgt.
  • the reset signal RES generation circuit 55 is configured by using, for example, a treswait generation circuit 551 that generates a reset period treswait and a reset pulse generation circuit 552 that generates a pulsed reset signal RES.
  • the AND circuit 553 connected to the input side of the treswait generation circuit 551 contains a signal in which the rectangular wave signal 1a from the waveform shaping circuit 51 is inverted via the inverter circuit 554a and a signal 1b for detecting the second rise.
  • a signal 1d inverted via the inverter circuit 554b and a signal 2c inverted from the IGT generation circuit 52 are input via the inverter circuit 554c.
  • the threshold generation circuit 551 may be configured by using a counter circuit (digital circuit) like the IGW generation circuit 53 and the IGA generation circuit 54 described above, but as shown in the figure, the constant current source 555 and the capacitor C2 And, it can also be configured by an analog circuit including a comparator CMP1.
  • the treswait generation circuit 551 when the signal from the AND circuit 553 is H level, the switch SW5 is turned on, the capacitor C2 is connected to the constant current source 555, and a constant current flows. As a result, the capacitor C2 is charged, and the input potential 4a of the positive terminal of the comparator CMP1 connected to the capacitor C2 exceeds the reference potential supplied to the negative terminal, so that the signal 4b from the comparator CMP1 becomes H level. Become.
  • the other end of the resistor R2 whose one end is grounded is connected between the capacitor C2 and the comparator CMP1, and the time constant of the capacitor C2 and the resistor R2 can be used to adjust the reset period to a predetermined reset period.
  • a discharge resistor R3 may be further provided in parallel with the resistor R2, and the discharge switch SW6 may be used to open / close the connection with the ground potential. As a result, for example, the discharge switch SW6 is turned on in synchronization with the latch reset, and the positive terminal side of the capacitor C2 is connected to the ground potential via the discharge resistor R3, whereby rapid discharge becomes possible.
  • the reset pulse generation circuit 552 has a Nando circuit 556 that outputs a reset signal RES.
  • the signal 4b from the treswait generation circuit 551 is input to the Nando circuit 556, and is also input as a signal 4c from a delay circuit having a plurality of inverter circuits 554d and 554e and a resistor R4 and a capacitor C3 arranged between them. Will be done.
  • the output from the AND circuit 553 is L level in the initial state
  • the rectangular wave signal 1a is L level
  • the signal 1b is L level (signal 1d is H level)
  • the signal 2c Only when is L level, it becomes H level. That is, in the initial state, the switch SW5 is off, and after the signal 1b reaches the L level at the second rise of the square wave signal 1a, the waiting time twait elapses, the signal 2c falls, and the square wave further falls.
  • the signal 1a falls, it is determined that the ignition control signal IG has ended, and the switch SW5 is turned on.
  • the signal 4b output from the comparator CMP1 becomes H level. Then, after the predetermined reset period treswait, when the switch SW5 is turned off and the capacitor C2 is discharged to fall below the reference potential Vth RES , the signal 4b from the comparator CMP1 becomes the L level.
  • the signal 4b becomes H level while the switch SW5 is turned on and the input potential 4a exceeds the reference potential Vth RES .
  • the signal 4c is a signal obtained by delaying the signal 4b. Since the switch SW5 is off in the initial state, the output of the comparator CMP1 is at the L level, and the signal 4c is at the L level.
  • the signal 4c and the signal 4b are input to the Nando circuit 558, and the output reset signal RES becomes the L level only when both of these signals are at the H level.
  • the reset signal RES is at the H level in the initial state, and when the switch SW5 is turned on at the second fall of the square wave signal 1a, the signal 4b becomes the H level with a predetermined delay.
  • the reset signal RES drops to the L level.
  • the latch of each circuit is reset, the signal 1d becomes L level, the switch SW5 is turned off, and the discharge of the capacitor C2 causes the signal 4b, which is the output of the comparator CMP1, to become L level after a predetermined period of tdischg.
  • the reset signal RES rises to the H level again and returns to the initial state.
  • the reset pulse generation circuit 552 can output the pulsed reset signal RES.
  • the reset period treswait is set longer than the energy input period t IGW in order to avoid the reset operation during the energy input operation.
  • the on period of the switch SW5 corresponding to the reset period treswait is appropriately set so that the reset operation is performed after the energy input period t IGW has elapsed. It should be set.
  • the engine ECU 100 transmits the ignition control signal IG including the information of the main ignition signal IGT, the energy input signal IGW, and the target secondary current command signal IGA to the ignition device 10 in advance.
  • each signal can be separated. Then, by outputting the separated signal at a predetermined timing, the main ignition operation and the energy input operation can be performed. That is, the engine ECU 100 outputs the ignition control signal IG at a timing earlier than the main ignition signal IGT by the standby time twait, and can generate in advance the signals necessary for the main ignition and energy input. It is possible to realize the ignition control device 1 capable of suppressing the influence of noise and the like by reducing the number of signal lines connecting the two.
  • the ignition control signal IG does not necessarily have to consist of the first signal IG1 and the second signal IG2. For example, a signal that rises at a timing earlier than the main ignition signal IGT by a standby time twait and falls at the same time as the main ignition signal IGT. It can also be. In that case, one ignition control signal IG, which is longer than the main ignition signal IGT by twait, is output from the engine ECU 100 at a timing earlier than the main ignition signal IGT by twait. As a result, it can be applied to a normal ignition operation that does not involve energy input. An example of such a modification of the ignition control signal IG will be described with reference to the following embodiments 2 to 4.
  • the basic configuration and basic operation of the ignition control device 1 are the same as those in the first embodiment, and the description thereof will be omitted.
  • the ignition control signal IG is composed of one pulsed signal, and is substantially received as a signal in which the first signal IG1 and the second signal IG2 are integrated.
  • the rectangular wave signal 1a obtained by waveform-shaping the ignition control signal IG also becomes one pulse-like signal, and the main ignition signal IGT is generated based on the rising and falling edges.
  • the IGT generation circuit 52 waits from the rise of the square wave signal 1a.
  • the time twait has elapsed and the signal level is H level, that time point is the rise of the main ignition signal IGT.
  • the signal level of the rectangular wave signal 1a reaches the L level after the rising point, the main ignition signal IGT is generated with that point as the falling point of the main ignition signal IGT.
  • the main ignition drive circuit 31 drives the main ignition switch SW1, and when the main ignition signal IGT rises, energization of the main primary coil 21a is started, so that the primary current I1 flows. Then, by interrupting the energization of the main primary coil 21a, a high voltage is generated in the secondary coil 22 and the secondary current I2 flows.
  • the IGW generation circuit 53 and the IGA generation circuit 54 generate the energy input signal IGW and the target secondary current command signal IGA based on the square wave signal 1a.
  • the energy input signal IGW and the target secondary current command signal IGA remain at the L level. Therefore, the energy input operation is not performed.
  • the ignition control signal IG By setting the ignition control signal IG to a signal waveform including one or two pulses in this way, it is possible to start the main ignition operation and further indicate whether or not the energy input operation is performed.
  • the signal from the engine ECU 100 is set so that the rise period t IGT of the main ignition signal IGT required for the engine operating conditions is started during the elapse of the standby time twait when the energy input operation is not performed. Will be done. That is, the ignition control signal IG is transmitted as one signal in which the waiting time twait overlaps with the rising period t IGT and the first signal IG1 and the second signal IG2 are indistinguishable. That is, the signal from the engine ECU 100 can be easily applied even when the energy input is not performed only by the main ignition operation by transmitting the signal from the engine ECU 100 retroactively for the standby time twait with respect to the rise period t IGT .
  • the counters such as the main ignition signal IGT, the energy input signal IGW, and the target secondary current command signal IGA are promptly reset after a predetermined delay period tfil from the main ignition operation. By doing so, it is possible to shift to the next ignition operation without waiting for the reset period current.
  • the ignition control signal IG shown in FIG. 16 left figure [A] is composed of one pulse-like signal, and has a relatively short pulse width corresponding to, for example, the first signal IG1. In that case, when the waiting time twait elapses from the rise of the waveform-shaped rectangular wave signal 1a, the signal level becomes L level and the main ignition signal IGT is not output.
  • the IGA generation circuit 54 determines the rise period t IGA_IN. , The target secondary current command signal IGA is generated. However, since the signal corresponding to the second signal IG2 is not received after that and the recurrence is not detected from the rise of the rectangular wave signal 1a until the waiting time twait elapses, the main ignition signal IGT and the energy input signal IGW Is not output.
  • the main ignition operation becomes unnecessary for some reason such as a change in engine operating conditions after receiving the first signal IG1, the transmission of the second signal IG2 from the engine ECU 100 is stopped, so that the main ignition operation is stopped.
  • the ignition operation can be stopped. Further, for example, when noise or the like associated with the ignition operation of another cylinder is input, even if it is regarded as the first signal IG1 in the signal separation circuit unit 5, if there is no input of the second signal IG2, the main ignition signal IGT Is not generated, so malfunctions can be avoided.
  • the ignition control signal IG is composed of two pulse signals, before the waiting time twait elapses from the rise of the square wave signal 1a.
  • the signal level of the second signal IG2 becomes the L level, the main ignition signal IGT is not generated.
  • the rising interval t IGW_IN is set by detecting the rising edge from the rising edge of the rectangular wave signal 1a until the waiting time twait elapses, but the main ignition signal IGT is not output, so that the energy The input signal IGW is also not output.
  • the main ignition operation is stopped by stopping the transmission of the second signal IG2 before the waiting time twait elapses. be able to.
  • the ignition control device 1 can be made resistant to noise.
  • the basic configuration and basic operation of the ignition control device 1 are the same as those in the first to third embodiments, and the differences will be mainly described below.
  • the ignition control signal IG shown in the left figure and the ignition control signal IG shown in the right figure have the same waveform composed of the first signal IG1 and the second signal IG2, and are variably set according to the engine operating conditions.
  • the wait time twait is different.
  • the engine operating condition is, for example, the engine speed, and the higher the engine speed, the shorter the waiting time twait.
  • the waiting time twait is set longer, and the waiting time twait is set before the elapse. 2 signal IG2 goes down.
  • the signal level of the square wave signal 1a is the L level when the waiting time twait elapses
  • only the target secondary current command signal IGA is output as in the third embodiment. That is, the main ignition signal IGT is not output and the main ignition operation is not performed.
  • the motor can be driven and the ignition operation can be stopped.
  • the waiting time twait is set to be long in the corresponding low rotation region so that the second signal IG2 falls before the waiting time twait elapses.
  • the main ignition signal IGT is not output and the main ignition operation cannot be performed.
  • the waiting time twait is set shorter, and after the waiting time twait elapses, the second signal IG2 is displayed. Get up. Therefore, when the standby time twait elapses, the signal level of the square wave signal 1a becomes the H level, and the signal separation circuit unit 5 performs the main ignition signal IGT, the energy input signal IGW, and the target 2 as in the first embodiment. The next current command signal IGA is output.
  • the primary current I1 flows by starting the energization of the main primary coil 21a in synchronization with the rise of the main ignition signal IGT, and then the secondary current I2 flows by shutting off. Further, during the period specified by the energy input signal IGW, the energy input operation set by the target secondary current command signal IGA is performed, the secondary current I2 is maintained, and the current I NET flows.
  • the standby time twait so that the main ignition signal IGT is output at the energization timing according to the ignition timing.
  • the main ignition signal IGT rises when the signal level is H level at the time when the waiting time twait elapses from the rise of the rectangular wave signal 1a. Therefore, it is desirable to set the waiting time twait to be shorter as the ignition cycle becomes shorter in the high rotation range.
  • the waiting time twait when the waiting time twait is changed according to the engine operating conditions, for example, the engine speed, it may be changed continuously or stepwise. Specifically, as the rotation speed increases, the waiting time twait may be continuously shortened as shown in the left figure, or a certain rotation speed N1 as shown in the right figure. After that, the waiting time twait may be set to be shortened each time a higher rotation speed N2 or N3 is reached.
  • the ignition device 10 receives the ignition control signal IG transmitted from the engine ECU 100 by the signal separation circuit 5, and receives the separated main ignition signal IGT from the main ignition circuit unit 3. It is transmitted to the main ignition drive circuit 31 and also to the sub-primary coil control circuit 41 of the energy input circuit unit 4.
  • the flowchart shown in FIG. 19 shows a procedure executed in order to separate and generate each signal from the ignition control signal IG in the ignition device 10.
  • FIG. 20 in the same flowchart, the procedures executed in the first to third embodiments are compared by using the arrows shown in the drawings.
  • each signal is separated from the different ignition control signal IGs through different procedures.
  • the time chart shown in FIG. 21 corresponds to the first embodiment, and as shown in FIG. 2 above, the ignition control signal IG includes a first signal IG1 and a second signal IG2, and is composed of a main ignition operation and energy input. Both actions are performed.
  • the procedure of the first embodiment will be mainly described with reference to FIG.
  • step 101 when the signal separation process is started by the signal separation circuit 5, it is first determined in step 101 whether or not the rise of the ignition control signal IG is detected.
  • the first rising edge that is, the rising edge of the first signal IG1
  • the process proceeds to step 102, and when the negative determination is made, step 101 is repeated until the affirmative determination is made.
  • the IGA generation circuit 54 starts the detection of the rising period t IGA_IN of the square wave signal 1a
  • the IGW generation circuit 53 starts the detection of the rising interval t IGA_IN of the square wave signal 1a.
  • the rise period t IGA_IN is a period from the first rise to the fall of the rectangular wave signal 1a, and corresponds to the rise period of the first signal IG1 in the first embodiment.
  • the rising interval t IGW_IN is a period from the first rising edge of the rectangular wave signal 1a to the second falling edge, and in the first embodiment, it corresponds to the interval between the rising edge of the first signal IG1 and the rising edge of the second signal IG2. To do.
  • step 103 it is determined whether or not the first falling edge of the rectangular wave signal 1a (that is, the falling edge of the first signal IG1) is detected in the IGA generation circuit 54.
  • the process proceeds to step 104, and when the negative determination is made, the process proceeds to step 105.
  • step 103 is positively determined, the rise period t IGA_IN is determined in step 104, and the target secondary current value I2tgt represented by the function f (t IGA_IN ) is determined.
  • the rising edge and the falling edge of the first signal IG1 are detected, so that the rising period t IGA_IN of the rectangular wave signal 1a is detected (for example, 0.5 ms).
  • the target secondary current command signal IGA output from the IGA generation circuit 54 gradually rises and then is held at a constant value.
  • the target secondary current value I2tgt is variably set according to the length of the rising period t IGA_IN , and as shown in Table 1 above, for example, when 0.5 ms, the target secondary current value I2tgt is set. It is 90mA.
  • step 106 it is determined whether or not the second rise of the rectangular wave signal 1a (that is, the rise of the second signal IG2) is detected in the IGW generation circuit 53.
  • the process proceeds to step 107, and when the negative determination is made, the process proceeds to step 108.
  • step 106 is affirmatively determined, the rise interval t IGW_IN period is determined in step 107, and the energy input period t IGW is determined based on this.
  • the rising interval t IGW_IN of the rectangular wave signal 1a is detected by detecting the rising edge of the first signal IG1 and the rising edge of the second signal IG2 (for example, 2). .5ms).
  • an energy input period t IGW having a length equivalent to the rise interval t IGW_IN is set (for example, 2.5 ms), and an energy input signal IGA is output after a predetermined standby time twait.
  • step 109 it is determined whether or not the predetermined waiting time twait has been reached.
  • the standby time twait is separately generated by the twait generation circuit 521 of the IGT generation circuit 52 as the elapsed time from the rise of the rectangular wave signal 1a.
  • step 110 the process proceeds to step 110 to start and execute the energy supply operation.
  • the energy supply operation is a main ignition operation and an energy input operation, both of which are carried out in the first embodiment.
  • step 111 it is determined whether or not the signal level of the rectangular wave signal 1a is H level, and if it is affirmatively determined, the process proceeds to step 112.
  • step 112 the gate signal IGBT_gate output from the main ignition drive circuit 31 is set to the H level, and the main ignition switch SW1 is driven on.
  • the main ignition signal IGT rises, energization of the primary coil 21 for the main ignition operation is started, and the primary current I1 rises.
  • step 111 is negatively determined, the process proceeds to step 116.
  • step 113 it is determined whether or not the signal level of the rectangular wave signal 1a is the L level, and if affirmative determination is made, the process proceeds to step 114.
  • step 114 the main ignition switch SW1 is turned off with the gate signal IGBT_gate as the L level. As a result, in FIG. 21, the main ignition signal IGT falls (for example, 4 ms after the rise), and the energization of the primary coil 21 is cut off. Then, a spark discharge occurs in the spark plug P due to the high voltage generated in the secondary coil 22.
  • step 115 the energy input operation is performed.
  • the gate signals MOS_gate1 and MOS_gate2 for the energy input operation are from the secondary primary coil control circuit 41 based on the target secondary current value I2tgt and the energy input period t IGW determined in steps 104 and 107 above. It is output at a predetermined timing, and the discharge continuation switch SW2 and the recirculation switch SW3 are driven.
  • the energy input operation is started after a predetermined delay period t fil (for example, 0.1 ms after the rise) from the fall of the main ignition signal IGT.
  • the energy input operation is performed so as to maintain the target secondary current value I2tgt (for example, 90 mA) during a predetermined energy input period t IGW (for example, 2.5 ms), and the secondary current I2 and the current I NET It flows.
  • I2tgt for example, 90 mA
  • t IGW for example, 2.5 ms
  • step 116 the energy input period t IGW and the target secondary current value I2 tgt for the energy input operation are reset. After that, this process is temporarily terminated.
  • the setting for the energy input operation is reset to the initial state after a predetermined reset period treswait elapses from the fall of the rectangular wave signal 1a (for example, 4 ms after the fall).
  • the main ignition signal IGT, the energy input signal IGW, and the target secondary current command signal IGA are generated from the ignition control signal IG shown in the first embodiment, and the main ignition operation and the energy input operation are performed. Can be done.
  • step 105 it is determined whether or not the predetermined waiting time twait has been reached.
  • the operation after step 105 is substantially the same as the operation after step 109 described above, and when the affirmative determination is made in step 105, the process proceeds to step 117 and the energy supply operation is started.
  • the negative determination in step 105 is made, the process returns to step 102 and the subsequent operations are repeated.
  • step 118 it is first determined whether or not the signal level of the rectangular wave signal 1a is the H level. When the affirmative judgment is made, the process proceeds to step 119, the gate signal IGBT_gate is set to the H level, and the main ignition switch SW1 is turned on. When step 118 is negatively determined, the process proceeds to step 122.
  • step 120 it is determined whether or not the signal level of the rectangular wave signal 1a is the L level.
  • the process proceeds to step 121, the gate signal IGBT_gate is set to the L level, and the main ignition switch SW1 is turned off. As a result, the energization of the primary coil 21 is cut off, and the high voltage generated in the secondary coil 22 causes a spark discharge in the spark plug P.
  • the process proceeds to step 122, and after the reset period treswait elapses from the fall of the square wave signal 1a, the energy for the energy input operation is performed. Reset the closing period t IGW and the target secondary current value I2tgt. After that, this process is temporarily terminated.
  • the main ignition signal IGT for the main ignition operation can be generated from the ignition control signal IG shown in the second embodiment.
  • step 108 it is determined whether or not the predetermined waiting time twait has been reached.
  • the operation after step 108 is substantially the same as the operation after step 109 described above, and when the affirmative determination is made in step 108, the process proceeds to step 117 and the energy supply operation is started.
  • the negative determination in step 108 is made, the process returns to step 106 and the subsequent operations are repeated.
  • step 118 When the energy supply operation is started in step 117, it is determined in the following step 118 whether or not the signal level of the rectangular wave signal 1a is H level.
  • the rectangular wave signal 1a falls before the waiting time twait, so that step 118 is negatively determined.
  • the process proceeds to step 122, and after the reset period treswait elapses from the fall of the rectangular wave signal 1a, the energy input period t IGW and the target secondary current value I2tgt for the energy input operation are reset. After that, this process is temporarily terminated.
  • step 106 since the first signal IG1 and the second signal IG2 are provided, the second rise of the rectangular wave signal 1a is detected in the above step 106. In that case, the flow is the same as that of the first embodiment, and the process proceeds to step 107 to determine the energy input period t IGW based on the rise interval t IGW_IN period. After that, the process proceeds to step 109, and it is determined whether or not the predetermined waiting time twait has been reached. When the affirmative determination is made in step 109, the process proceeds to step 110 to start the energy supply operation. When the negative determination in step 109 is made, the process returns to step 106 and the subsequent operations are repeated.
  • step 111 When the energy supply operation is started in step 110, it is determined in the following step 111 whether or not the signal level of the rectangular wave signal 1a is H level.
  • step 111 is negatively determined. In that case, the process proceeds to step 116, and after the reset period treswait elapses from the fall of the rectangular wave signal 1a, the energy input period t IGW and the target secondary current value I2tgt for the energy input operation are reset. After that, this process is temporarily terminated.
  • the main ignition signal IGT is not separately generated by the signal separation circuit 5, and the main ignition operation and the energy input operation are performed. Is not implemented.
  • the sixth embodiment according to the ignition control device will be described with reference to FIGS. 22 to 29.
  • the IGT generation circuit 52 for separating and generating the main ignition signal IGT from the ignition control signal IG received by the signal separation circuit 5 Other configuration examples are shown. Further, another configuration example of the IGW generation circuit 53 for separately generating the energy input signal IGW and the IGA generation circuit 54 for separately generating the target secondary current command signal IGA will be shown.
  • the IGT generation circuit 52 includes a twait generation circuit 521 for generating a standby time twait, an AND circuit 522, 523, and an inverter circuit 524. Similar to the first embodiment, the square wave signal 1a and the signal IGT_DCT from the waveform shaping circuit 51 are input to the IGT generation circuit 52, and the signal 2b and the rectangular wave signal 1a are output from the twait generation circuit 521. Based on this, the main ignition signal IGT and the signal 2c are generated.
  • the twait generation circuit 521 constituting the IGT generation circuit 52 is configured by a digital circuit using a counter circuit, but in the present embodiment, as shown in the figure, It is composed of an analog circuit including a constant current source 528, a capacitor C4, and a comparator CMP2.
  • the constant current source 528 and the capacitor C4 are connected via the switch SW7, and the resistor R5 is arranged in parallel with the capacitor C4.
  • the switch SW7 is turned off in the initial state, and is configured to be turned on when the signal IGT_DCT is at the H level.
  • the time from when the signal IGT_DCT reaches the H level until the signal 2b reaches the H level corresponds to a predetermined waiting time twait.
  • the output of the AND circuit 522 based on the logical sum of the signal 2b and the square wave signal 1a becomes the H level. That is, the main ignition signal IGT can be set to the H level only when the rectangular wave signal 1a is at the H level after the waiting time twait has elapsed.
  • the inverted signal of the signal 2b and the signal IGT_DCT are input to the AND circuit 523, and the signal 2c output based on the logical product of these is at the H level during the predetermined standby time twait.
  • the twait generation circuit 521 of the IGT generation circuit 52 can be configured as a delay circuit including a plurality of inverter circuits 524a and 524b and a CR time constant circuit.
  • the CR time constant circuit is a circuit using the time constants of the capacitor C5 and the resistor R6, and the inverter circuits 524a and 524b are connected to the input side and the output side, respectively.
  • the twait generation circuit 521 outputs a signal 5b having a delayed waveform. Since the signal 5b has a gradual rise, it takes a certain amount of time to reach the reference potential Vth3, and the signal 2b, which is the twice inverted signal, remains at the L level. When the reference potential Vth3 is reached, the signal 5b becomes the H level, and the signal 2b also rises to the H level.
  • the main ignition signal IGT can be output in the same manner. In that case, it is not necessary to use a comparator, a reference voltage, a constant current source, or the like, so that the circuit configuration can be simplified. Further, the standby time twait may be detected by using the counter of the digital circuit.
  • the IGW generation circuit 53 can be configured by using an analog integrator circuit.
  • the IGW generation circuit 53 includes an integrator circuit 534 having an operational amplifier AMP, a resistor R IGW, and a capacitor C IGW , a comparator COMP, an AND circuit 535, an inverter circuit 536, and a plurality of switches SW1 IGW to SW3 IGW. And a reset switch RES IGW .
  • the signal IGW_DCT is input to the integrating circuit 534 from the waveform shaping circuit 51, and the output from the integrating circuit 534 is input to one terminal of the AND circuit 535 via the comparator COMP.
  • a signal in which the rectangular wave signal 1a from the waveform shaping circuit 51 is inverted via the inverter circuit 536 is input to the other terminal of the AND circuit 535.
  • a reset switch RES IGW is connected between both terminals of the capacitor C IGW .
  • the switch SW1 IGW is on, and the switches SW2 IGW and SW3 IGW are off.
  • energization of the capacitor C IGW is started, and the capacitor C IGW is charged while the signal IGW_DCT is at the H level.
  • Charging time is converted to voltage VC IGW .
  • by detecting the re-rise of the signal IGW_DCT by turning off the switch SW1 IGW, SW3 IGW, voltage VC IGW of the capacitor C IGW is held.
  • the switch SW2 IGW the electric charge of the capacitor C IGW is prepared to be discharged.
  • the inverted signal of the square wave signal 1a is input to the AND circuit 535, but the input to the comparator COMP falls below the reference voltage Vth IGW , and the energy input signal IGW remains at the L level.
  • the waiting time twait generated by the IGT generation circuit 52 has elapsed and the square wave signal 1a is at the H level, a predetermined delay from the fall (main ignition discharge) of the square wave signal 1a.
  • the charge of the capacitor C IGW is discharged by turning on the switch SW3 IGW .
  • the output from the comparator COMP rises, and the output from the AND circuit 535 becomes H level.
  • the voltage VC IGW of the capacitor C IGW gradually decreases with a discharge time corresponding to the charging time, and the period until the voltage falls below the reference voltage Vth IGW is defined as the energy input period t IGW , and the H level energy input signal IGW is generated. It is output. After that, the switches SW1 IGW to SW3 IGW return to the initial state.
  • the IGA generation circuit 54 may be configured by an analog circuit. Specifically, IGA generating circuit 54, instead of using the up-counter circuit as the first embodiment, by using the constant current source 541 and the capacitor C IGA, from the rectangular wave signal 1a based signal IGA_DCT, its rising Detect period t IGA_IN .
  • the constant current source 541 and the capacitor C IGA are connected via the switch SW1 IGA , and the switch SW2 IGA is arranged in parallel with the capacitor C IGA .
  • the switch SW1 IGA is off and the switch SW2 IGA is on in the initial state.
  • the capacitor C IGA is charged while the signal IGA_DCT is at the H level, and the target secondary is charged.
  • the current command signal IGA rises.
  • the switches SW1 IGA and SW2 IGA are turned off, and the target secondary current command signal IGA is held.
  • the main ignition discharge is performed at the falling edge of the rectangular wave signal 1a, and further.
  • the energy input signal IGW rises.
  • the target secondary current command signal IGA is set in the same manner as in Table 1 of the first embodiment so that, for example, the larger the voltage value, the larger the target secondary current value I2tgt.
  • the IGT generation circuit 52, the IGW generation circuit 53, and the IGA generation circuit 54 can have various configurations using a digital circuit or an analog circuit.
  • the primary coil 21 of the ignition coil 2 is composed of a main primary coil 21a and a secondary primary coil 21b so as to be connected in parallel to the DC power supply B, but the present invention is not limited to this.
  • the ignition coil 2 may be composed of a primary coil 21 and a secondary coil 22.
  • the energy input circuit unit 4 may be provided with a booster circuit 42 and a capacitor 43 so that the energy stored in the capacitor 43 is superimposed on the ground side of the primary coil 21.
  • the booster circuit 42 includes a boosting switching element (hereinafter referred to as a boosting switch) SW8, a boosting driver circuit 421 for driving the boosting switch SW8, a choke coil 422, and a diode 423.
  • the boost driver circuit 421 switches the boost switch SW8 to store the energy generated in the choke coil 422 in the capacitor 43.
  • the discharge continuation switch SW9 is connected between the primary coil 21 and the main ignition switch SW1 via a diode 44, and is driven by an energy input driver circuit 45.
  • the diode 423 has a forward direction toward the capacitor 43, and the diode 44 has a forward direction toward the primary coil 21.
  • the boost driver circuit 421 is driven based on the main ignition signal IGT to charge the capacitor 43 during the main ignition operation.
  • the energy input driver circuit 45 accumulates in the capacitor 43 by driving the discharge continuation switch SW9 during the energy input period t IGW after the main ignition operation based on the target secondary current command signal IGA and the energy input signal IGW.
  • the generated energy is superposed on the ground side of the primary coil 21. Even with such a configuration, by increasing the current having the same polarity as the secondary current I2, the energy input operation can be performed and the spark discharge can be continued.
  • the configurations of the ignition coil 2 and the energy input circuit unit 4 can be arbitrarily changed.
  • the booster circuit 42 of the seventh embodiment may be provided, and the secondary primary coil 21b may be fed from the booster circuit 42 to perform the energy input operation.
  • a plurality of sets for example, two sets of ignition coils 2 composed of a primary coil 21 and a secondary coil 22 are provided, and one ignition coil 2 performs a main ignition operation, and the other ignition coil 2 is used.
  • the energy input operation may be performed.
  • the present disclosure is not limited to each of the above embodiments, and can be applied to various embodiments without departing from the gist thereof.
  • the ignition control signal IG has been described in the case of a positive logic signal whose logic is “1” when the signal voltage is H level, but it may be a negative logic signal whose potential is opposite. The same applies to signals other than the ignition control signal IG, which can be appropriately set.
  • the internal combustion engine to which the ignition control device 1 is applied can be a gasoline engine for automobiles or various spark ignition type internal combustion engines. Further, the configurations of the ignition coil 2 and the ignition device 10 can be appropriately changed according to the internal combustion engine to be attached, and the configuration may be such that the energy input operation can be performed after the main ignition operation. For example, two sets of ignition coils 2 may be provided so that the secondary coils 22 are connected in series, and the secondary current generated on one side can be supplied to the other side.

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