JP2595152B2 - Ignition device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacity discharge type ignition device for an internal combustion engine in which a discharge duration is extended by using a discharge sustaining closed circuit, and more particularly to an ignition coil output voltage determination even at a high engine speed. The present invention relates to an ignition device for an internal combustion engine that can reliably charge a capacitor.

[0002]

2. Description of the Related Art Heretofore, a capacity discharge type internal combustion engine in which a boosted voltage is charged in a capacitor in advance and a boosted voltage from the capacitor is discharged to a primary side of an ignition coil to generate a discharge in an ignition plug. Background of the Invention Ignition devices (CDI) are well known. In this type of internal combustion engine ignition device,
Especially, in order to prevent misfiring at the time of low temperature start, a closed circuit for sustaining discharge including an inductor is juxtaposed on the primary side of the ignition coil,
The energy stored in the inductor extends the discharge duration of the spark plug (LCDI).

FIG. 6 is a configuration diagram showing a conventional ignition device for an internal combustion engine comprising an LCDI. In the drawing, reference numeral 1 denotes a battery for supplying power to the entire device. 2 is battery 1
Is a booster circuit that boosts the output voltage of the
And a step-up switching element, that is, a power transistor 22, for generating a step-up voltage from the step-up coil 21 by repeating the cut-off of the step-up coil 21 .

[0004] 3 is an ignition signal G consisting of a timing pulse.
Is a discharge trigger circuit that generates a discharge trigger signal T at the falling timing of the ignition signal G. Diodes 5 and 6 are connected in parallel to the output terminal of the booster circuit 2 and allow the boosted voltage to pass therethrough.
Is a first and second capacitor (hereinafter simply referred to as a capacitor) for individually charging a boosted voltage via each of the diodes 5 and 6 in response to the operation of the booster circuit 2 , and 9 is a charging side of each of the capacitors 7 and 8. An inductor inserted between terminals for extending the discharge duration for storing the discharge energy of the capacitor 8. In this case, the capacitor 7 for determining the discharge output voltage
The other end of the capacitor 8 for extending the discharge duration is grounded.

An ignition coil 10 supplies a boosted voltage to the primary side when each of the capacitors 7 and 8 is discharged.
A spark plug connected to the secondary side of 10, an ignition coil 10
A backflow preventing diode 13 for preventing current oscillation on the primary side is a discharge switching element or thyristor inserted between the primary side of the ignition coil 10 and the ground and turned on by the discharge trigger signal T.

Reference numeral 14 denotes the primary side of the ignition coil 10 and a thyristor
A diode inserted between the connection point 13 and the connection point between the capacitor 8 and the inductor 9 forms a closed circuit for sustaining discharge together with the primary side of the inductor 9 and the ignition coil 10. The capacitor 7, the primary side of the ignition coil 10 and the thyristor 13 constitute a first closed circuit for discharging, and the capacitor 8, the inductor 9, the primary side of the ignition coil 10 and the thyristor 13 constitute a second closed circuit for discharging. Make up.

[0007] 15 is a power transistor for each ignition cycle
A drive circuit for generating a drive signal D to 22;
Driving power transistor 22 repeatedly (repeatedly
By then turning on and off) that, after discharge capacitor 7
And 8, the boosted voltage from the booster circuit 2 is recharged. The drive circuit 15 includes an oscillation circuit 15a that generates a clock signal C.
A logic circuit 15b for generating a logical signal L by taking a logical product of a clock signal C and a voltage signal S ₈ (described later); and a drive output circuit 15c for generating a drive signal D based on the logical signal L. ing. Reference numeral 30 denotes a voltage detection circuit that detects a charging voltage V ₈ of the capacitor 8, generates a voltage signal S ₈ indicating whether the charging voltage V ₈ is equal to or lower than a predetermined voltage, and inputs the voltage signal S ₈ to a logic circuit 15 b in the drive circuit 15. .

Next, the operation of the conventional ignition device for an internal combustion engine shown in FIG. 6 will be described with reference to the waveform diagrams of FIG. 7 and FIG. Normally, the capacitors 7 and 8 are charged with a predetermined boosted voltage by the booster circuit 2. In this state, when the ignition signal G is generated from the ignition signal generation circuit 3 at a predetermined ignition timing according to the request of the internal combustion engine, the ignition signal G
A discharge trigger signal T is generated from the discharge trigger circuit 4 at the falling timing of the signal.

The thyristor 13 is triggered by the discharge trigger signal T.
Is turned on, and the charging voltage V ₇ of the capacitor 7 is rapidly discharged through the first closed circuit for discharging, that is, the primary side of the ignition coil 10 and the thyristor 13, and a high voltage is applied to the secondary side of the ignition coil 10. The discharge spark is generated in the spark plug 11 when it occurs.
Similarly, the charging voltage V ₈ of the capacitor 8 discharges through the second closed circuit for discharging, that is, the inductor 9, the primary side of the ignition coil 10, and the thyristor 13. The thyristor 13 is turned off at the same time as the discharge current of the capacitors 7 and 8 becomes less than the conduction holding current.

At this time, the discharge energy of the capacitor 8 is stored in the inductor 9 in the second closed circuit for discharge, and this energy becomes the current for maintaining the discharge from the inductor 9 even after the discharge of the capacitors 7 and 8 is completed. Flow through the closed circuit for sustaining discharge, that is, the primary side of the ignition coil 10 and the diode 14,
The current on the primary side of the ignition coil 10 continues to flow.

Accordingly, a discharge is generated at the fall of the ignition signal G in the ignition plug 11 connected to the secondary side of the ignition coil 10, and the discharge duration is extended while the current of the inductor 9 is maintained. The desired ignition is ensured. For example,
Discharge time of capacitor 7 through thyristor 13 is 100μ
The discharge time of the closed circuit for sustaining discharge is
It is about 1.5 ms.

On the other hand, when the capacitors 7 and 8 are discharged, the voltage detection circuit 30 detects the charging voltage V ₈ of the capacitor ₈ and generates an L level voltage signal S ₈ when the charging voltage V ₈ falls below a predetermined voltage. Then, it is input to the logic circuit 15b. The voltage signal S ₈ for driving the drive circuit 15 is generated in response to the discharge of the capacitors 7 and 8, that is, in response to the ignition signal G.

As a result, the logic circuit 15b outputs the voltage signal S ₈
Passes the clock signal C during the L level period, and generates a logic signal L synchronized with the fall of the ignition signal G.
Further, the drive output circuit 15c intermittently generates the drive signal D based on the logic signal L and repeatedly cuts off the power supply of the power transistor 22 in the booster circuit 2.

Accordingly, the input current of the boosting coil 21 synchronized with the drive signal D is supplied from the battery 1, and a boosting voltage is generated from the boosting coil 21 in the falling section of each input current. The capacitors 7 and 8 are repeatedly charged via 5 and 6. or,
When the charging voltage V ₈ (= V ₇ ) of the capacitor 8 reaches a predetermined voltage, the voltage signal S ₈ goes to H level, the logic signal L remains at L level, the drive signal D stops, and the capacitors 7 and 8 To prevent overcharging.

[0015] Here, as shown in FIG. 7, when a normal operation the engine is not high rotation, the charging voltage V ₇ and V ₈ of the capacitor for each ignition cycle reaches a predetermined voltage, ignition The ignition in response to the signal G is reliably performed. However, as shown in FIG. 8, at the time of high engine rotation, the ignition cycle is shortened, since the ignition signal G is generated before the charging voltage V ₇ and V ₈ of the capacitor reaches a predetermined voltage, a sufficient charge voltage obtained Otherwise, the capacitors 7 and 8 may discharge and may not be ignited.

[0016]

As described above, the conventional ignition device for an internal combustion engine has a capacitor 7 for each ignition cycle.
And since the charge 8 at the same time, at the time of high engine rotation can not be secured charge voltage V _7, the discharge output voltage for the ignition coil 10 has a problem that there is a risk of misfiring drops.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has an internal combustion engine capable of securing a charging voltage of a capacitor for determining a discharge output voltage and preventing a misfire even at a high engine speed. An object of the present invention is to obtain an engine ignition device.

[0018]

According to a first aspect of the present invention, there is provided an ignition device for an internal combustion engine, wherein a voltage detecting means for generating a voltage signal indicating that a charging voltage of a first capacitor has reached a predetermined voltage. A charge trigger circuit for generating a charge trigger signal in response to a voltage signal and a drive signal;
And charging switching means that is inserted into the charging path of the capacitor and turned on by a charging trigger signal.

According to a second aspect of the present invention, there is provided an ignition device for an internal combustion engine which generates first and second charge trigger signals in response to an operation state signal and a drive signal. A charge trigger circuit, first charging switching means inserted into the charge path of the first capacitor and turned on by the first charge trigger signal, and second charge inserted into the charge path of the second capacitor And second charging switching means that is turned on by a trigger signal.

[0020]

According to the first aspect of the present invention, the charging voltage of the first capacitor directly contributing to ignition is reduced in view of the fact that misfire does not easily occur at high engine speed without extending the discharge duration. After reaching the predetermined voltage, the second capacitor for extending the discharge time is charged.

According to the second aspect of the present invention, the charging voltage of the first capacitor is ensured, and the charging voltage of the first capacitor is reduced to a required minimum voltage in an operation state in which misfire is unlikely to occur. Decrease.

[0022]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of the present invention.
1 to 5, 7 to 15 and 30 are the same as described above. 6A is a charging switching means or thyristor inserted in the charging path of the capacitor 8 in place of the diode 6 is turned on by the output terminal is connected charge trigger signal T ₆ of the booster circuit 2 (described later). Reference numeral 19 denotes a backflow prevention diode inserted in series with the inductor 9,
To prevent the charging voltage V ₇ from discharging to the capacitor 8.

Reference numeral 31 denotes a voltage detection circuit that generates a voltage signal S ₇ indicating that the charging voltage V ₇ of the capacitor 7 has reached a predetermined voltage, and 32 denotes a charging trigger signal T in response to the voltage signal S ₇ and the drive signal D. ₆ is a charge trigger circuit that generates ₆ .
The charging trigger circuit 32 includes a monostable multivibrator 33 that generates a trigger pulse _PT in synchronization with a logic signal L related to the drive signal D, a trigger pulse _PT and a voltage signal V _7.
And a trigger output circuit 34 which generates a charge trigger signal T ₆ takes the logical product.

Next, the operation of the embodiment of the present invention shown in FIG. 1 will be described with reference to the waveform diagrams of FIGS. First, as described above, when the ignition signal G is generated in a state where the capacitors 7 and 8 are charged, the discharge trigger circuit 4 generates the discharge trigger signal T to turn on the thyristor 13, and the charging voltages of the capacitors 7 and 8 are changed. Is the ignition coil 10
Discharge through the primary side and thyristor 13 and the spark plug
11 generates a discharge spark.

At this time, the discharge energy of the capacitor 8 is stored in the inductor 9, and the current of the inductor 9 flows to the primary side of the ignition coil 10 via the discharge sustaining closed circuit including the diodes 14 and 19, and the discharge plug 11 To increase the discharge duration. In addition, in order to recharge the capacitors 7 and 8 after discharging, the drive circuit 15 cuts off the power transistor 22 in the booster circuit 2 by the drive signal D, and repeatedly supplies the input current to the booster coil 21.

However, immediately after the discharge, the capacitor 7
Since the charging voltage V ₇ is equal to or lower than the predetermined voltage, the voltage detection circuit 31 outputs the voltage signal S ₇ at the L level, and the charging trigger circuit 32 does not output the charging trigger signal T ₆ . Accordingly, the thyristor 6A remains off, only the discharge output voltage determining capacitor 7 is charged, and the discharge sustaining capacitor 8 is not charged.

[0027] Then, the charge voltage V ₇ of the capacitor 7 reaches the predetermined voltage, the voltage signal from the voltage detection circuit 31 S ₇
Becomes H level, from the charging trigger circuit 32, trigger pulse P _T from the monostable multivibrator 33 which is synchronized with the logic signal L is outputted as a charge trigger signal T _6. Therefore, after the charging voltage V ₇ of the capacitor 7 has reached a predetermined voltage, the thyristor 6A is turned on, the charging of the capacitor 8 is started.

The charging trigger signal T _{6 at} this time is synchronized with the falling timing (charging timing) of the input current of the boosting coil 21 and has a sufficiently short pulse width as shown in FIG. It is also desirable from the point of suppression. Then, the charge voltage V ₈ of the capacitor 8 reaches a predetermined voltage, since the voltage signal S ₈ from the voltage detection circuit 30 prohibits the output of the logic signal L at the H level, the drive signal D
And charging operation longer outputs charge trigger signal T ₆ is terminated.

During normal operation as shown in FIG. 2, the ignition signal G
Since the cycle is long, the capacitors 7 and 8 but is charged to a predetermined voltage, the high engine rotation as in FIG. 3, the cycle of the ignition signal G is short charging voltage V ₈ of the capacitor 8 is insufficient. However, at the time of high engine rotation, at the request of the engine, there is no need to extend the discharge time, not any trouble occurs even at low charge voltage V ₈ of the discharge time extension of the capacitor 8.

Embodiment 2 FIG. In the above embodiment, the step-up circuit 2 is shown a case configured in the step-up transformer may be used a booster circuit 2A to be energized directly interrupts the booster coil 21 as shown in FIG.

In FIG. 4, reference numeral 15A denotes a drive circuit for generating a drive signal D 'based on the delay pulse P and a current signal I (to be described later), and reference numeral 16 denotes a drive circuit for generating a delay pulse P synchronized with the rising timing of the ignition signal G. Drive circuit 15
A is a monostable multivibrator input to A, 17 is a current detection circuit that detects a current flowing through the power transistor 22 and inputs a current signal I to the drive circuit 15A, and 18 is a diode.
A diode for preventing backflow inserted in the discharge path of the capacitor 7 so as to be in parallel with 19.

The monostable multivibrator 16 outputs a delay pulse P synchronized with the ignition signal G to the drive circuit 15A, and constitutes delay means for preventing the power transistor 22 from being turned on for the duration of discharge. In this case, not the ground but the anode of the battery 1 is a common terminal. The diode 14 shown in FIG. 1 has been removed, and the boosting coil 21, the diode 6, the inductor 9,
A discharge sustaining closed circuit for extending the discharge duration through the primary side of the ignition coil 10 and the thyristor 13 is formed.

Reference numeral 35 denotes a first charge trigger circuit (hereinafter simply referred to as a charge trigger circuit), which responds to an operating state signal, for example, an engine speed signal R and a logic signal L related to the drive signal D, by a first signal. the charge trigger signal T ₅ (hereinafter, simply referred to as charge trigger signal) is generated. 36 is a rotation speed signal R,
The second charge trigger signal T ₆ '(hereinafter, simply referred to as charge trigger signal) in response to the voltage signal S ₇ and the logic signal L second charging trigger circuit (hereinafter, simply referred to as the charging trigger circuit) for generating is .

[0034] 51 first charging switching means or thyristor, 52 discharge closed circuit of the capacitor 7 is connected in antiparallel to the thyristor 51 is turned on by the charging trigger signal T ₅ is inserted in the charging path of the capacitor 7 Is connected to the charging path of the capacitor 8 and is turned on by the charging trigger signal T ₆ ′. The second charging switching means or thyristor 62 is connected in anti-parallel to the thyristor 61 to discharge the capacitor 8. It is a diode that constitutes a closed circuit.

Next, referring to the waveform diagram of FIG.
The operation of another embodiment of the present invention shown in FIG. In this case, each of the thyristors 51 and 61 can be turned on and off in an arbitrary sequence by the charge trigger signals T ₅ and T ₆ ′ from each of the charge trigger circuits 35 and 36, and the capacitor 7 required according to the operation state can be turned on and off. it is possible to ensure the charging voltage V _7. In particular, in an operation state in which misfire is unlikely to occur, that is, in a region where the rotation speed signal R is larger than a predetermined value,
The charging voltage V ₇ of the capacitor 7 can be reduced to the minimum required voltage.

[0036] That is, the rotational speed signal R is a predetermined value or more high engine speed region, after the discharge time extension is not necessary, since the need to charge voltage V ₇ of which directly contributes capacitor 7 to the ignition is low, the charging trigger circuit 35 and 36, reduces the incidence of charge trigger signal T ₅ and T ₆ 'between ignition cycles.
Further, in the high rotation region, it is also possible not to generate the charge trigger signal T ₆ ′. In this case, even a difference occurs in the charge voltage V ₇ and V ₈ of the capacitor 7 and 8, the diode 18 and 19 are inserted, the other in each case which of the charging voltage V ₇ and V ₈ high The battery is not discharged and the charge voltage is maintained.

FIG. 5 shows operation waveforms in a state where the thyristors 51 and 61 are constantly turned on.
Are charged at the same time. In this case, the inductor 9 after the discharge
The current due to the stored energy flows through the closed circuit for sustaining discharge, that is, the primary side of the ignition coil 10, the thyristor 13, the boosting coil 21, and the diode 6. Also, the thyristor 13
While the current for sustaining the discharge is flowing, the conduction holding current is secured, so that the current does not turn off.

On the other hand, in order to charge the boosted voltage again to the discharged capacitors 7 and 8, it is necessary to supply an input current to the boosting coil 21 by the drive signal D ′. G, and generates a delay pulse P having a pulse width longer than the ignition signal G by a time corresponding to the required discharge duration, and the drive circuit 15A generates the drive signal D 'at the falling timing of the delay pulse P.
Generate As a result, during the discharge duration in which the secondary current of the ignition plug 11 flows, the power transistor 22 is kept off, and the current of the inductor 9 falls to the ground via the power transistor 22 and the current detection circuit 17. Instead, the current continues to flow to the primary side of the ignition coil 10 via the step-up coil 21.

When the capacitors 7 and 8 are charged by the drive signal D ', the drive circuit 15A drives the drive transistor 22 every time the current of the power transistor 22 reaches a predetermined value based on the current signal I obtained from the current detection circuit 17. Signal D '
Cut off. As a result, the input current value of the step-up coil 21 that is periodically cut off is kept constant, and the charging of the capacitors 7 and 8 is ensured.
Is limited. Therefore, the power transistor 22 is not destroyed by the overcurrent, and the power transistor 22 can be downsized.

Although the rotation speed signal R is used as the operation state signal in the above embodiment, other operation state signals such as a temperature signal may be used. Further, although giving priority to the charging voltage V ₇ of the capacitor 7 using a voltage signal S ₇ from the voltage detection circuit 31, a charge trigger signal T ₆ 'based without using a voltage detection circuit 31 only on the operating state signal The thyristor 61 may be turned on after the thyristor 51 is generated. Further, if it is determined that the charging voltage V ₇ is equal to or more than the predetermined voltage depending on the operation state, the capacitor 8 can be charged before the capacitor 7.

As shown in the above embodiments, the common terminals of the booster circuit 2, the capacitors 7, 8 and the thyristor 13 can be set on either the positive side or the ground side of the battery 1. Further, as the boosting means, a boosted voltage may be generated by simply repeating the cutoff of the current supply to the boosting coil 21. The boosted voltage may be generated from the secondary side of the boosting transformer using a DC-DC converter including the boosting transformer. May be generated. Also, the case where one cylinder is driven is shown, but the ignition coil 10, the ignition plug 11, and the thyristor
It is needless to say that the present invention can be applied to a case where a plurality of cylinders each including 13 individually are driven.

[0042]

As described above, according to the first aspect of the present invention, voltage detecting means for generating a voltage signal indicating that the charging voltage of the first capacitor has reached a predetermined voltage,
A charging trigger circuit that generates a charging trigger signal in response to the voltage signal and the drive signal; and a charging switching unit that is inserted into a charging path of the second capacitor and is turned on by the charging trigger signal to directly contribute to ignition After the charging voltage of the first capacitor reaches a predetermined voltage, the second capacitor for extending the discharge time is charged. Therefore, the charging voltage of the capacitor for determining the discharge output voltage is secured, and the engine is operated at high speed. There is an effect that an ignition device for an internal combustion engine that can prevent misfiring even at the time can be obtained.

According to the invention of claim 2 of the present invention,
The first and second signals in response to the operating state signal and the drive signal;
First and second charge trigger circuits for generating a charge trigger signal, first charge switching means inserted into the charge path of the first capacitor and turned on by the first charge trigger signal; Inserted into the charging path of the capacitor
And a second charging switching means that is turned on by a second charging trigger signal to secure a charging voltage of the first capacitor and to minimize a charging voltage of the first capacitor in an operation state in which misfire is unlikely to occur. As a result, the charging voltage of the capacitor for determining the discharge output voltage is secured, and an ignition device for an internal combustion engine that can prevent misfiring even at a high engine speed can be obtained. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a waveform diagram for explaining an operation during a normal operation of one embodiment of the present invention.

FIG. 3 is a waveform chart for explaining an operation at the time of high-speed operation of one embodiment of the present invention.

FIG. 4 is a configuration diagram showing another embodiment of the present invention.

FIG. 5 is a waveform chart for explaining a basic operation of another embodiment of the present invention.

FIG. 6 is a configuration diagram showing a conventional ignition device for an internal combustion engine.

FIG. 7 is a waveform chart for explaining the operation of the conventional internal combustion engine ignition device during normal operation.

FIG. 8 is a waveform diagram for explaining the operation of the conventional ignition device for an internal combustion engine during high-speed operation.

[Explanation of symbols]

2, 2A step-up circuit 21 step-up coil 22 step-up switching element 4 discharge trigger circuit 6A charging switching means 7 first capacitor 8 second capacitor 9 inductor 10 ignition coil 11 ignition plug 13 discharge switching element 15, 15A drive Circuit 31 Voltage detection circuit 32 Charge trigger circuit 35 First charge trigger circuit 36 Second charge trigger circuit 51 First charge switching means 61 Second charge switching means D, D 'Drive signal G Ignition signal R Rotation the number signal (operation condition signal) S ₇ voltage signal T discharge trigger signal T ₆ charge trigger signal T ₅ first charge trigger signal T ₆ 'second charge trigger signal V _7, V ₈ charging voltage

Claims (2)

(57) [Claims] 1. A booster coil and a booster coil
A boost switching element for generating a boost voltage
Boosting means including a boosting switching element in response to an ignition signal.Dora
To eveCircuit for generating drive signal for
And saidOperation of booster circuitCharge the boosted voltage in response to
A first and a second capacitor; an ignition coil having an ignition plug connected to the secondary side; and a primary side of the first capacitor and the ignition coil.
A first closed circuit for discharging and synchronous with the ignition signal.
A switching element for discharge to be turned on and off, the second capacitor, the primary side of the ignition coil and the
A second closed circuit for discharging together with the switching element for discharging.
And storing discharge energy of said second capacitor.
Inductor andTo prevent current oscillation on the primary side of the ignition coil,
A rectifying element connected between both ends of the primary side,  Generating a discharge trigger signal synchronized with the ignition signal,
Discharge trigger circuit that turns on the switching element for discharge
And the first and second capacitors according to the discharge trigger signal.
Through the first and second closed circuits for discharging.
At the same time as causing discharge at the spark plug.
The current due to the energy stored in the inductor
Supply to the closed circuit for sustaining discharge including the primary side of the ignition coil
And an internal combustion engine for extending the discharge duration of the spark plug
In the Seki ignition device, the charging voltage of the first capacitor has reached a predetermined voltage
Voltage detection means for generating a voltage signal indicating that the charging signal has occurred.
A charge trigger circuit for generating a charge signal; and a charge trigger circuit inserted into a charge path of the second capacitor,
And charging switching means that is turned on by a trigger signal. The charging voltage of the first capacitor reaches a predetermined voltage.
And charging the second capacitor later.
An ignition device for an internal combustion engine. 2. A booster coil and a booster coil
A boost switching element for generating a boost voltage
Boosting means including a boosting switching element in response to an ignition signal.Dora
EveCircuit for generating drive signal for
And saidOperation of booster circuitCharge the boosted voltage in response to
A first and a second capacitor; an ignition coil having an ignition plug connected to the secondary side; and a primary side of the first capacitor and the ignition coil.
A first closed circuit for discharging and synchronous with the ignition signal.
A switching element for discharge to be turned on and off, the second capacitor, the primary side of the ignition coil and the
A second closed circuit for discharging together with the switching element for discharging.
And storing discharge energy of said second capacitor.
Inductor andTo prevent current oscillation on the primary side of the ignition coil,
A rectifying element connected between both ends of the primary side,  Generating a discharge trigger signal synchronized with the ignition signal,
Discharge trigger circuit that turns on the switching element for discharge
And the first and second capacitors according to the discharge trigger signal.
Through the first and second closed circuits for discharging.
At the same time as causing discharge at the spark plug.
The energy stored in the inductor is
To the closed circuit for sustaining discharge including the primary side of the
Ignition system for internal combustion engine to extend the discharge duration of spark plug
A first and a second signal in response to an operating condition signal and the drive signal.
First and second charging triggers for generating a second charging trigger signal
A first circuit connected to a charging circuit of the first capacitor;
First charging switch turned on by charging trigger signal
A charging means for inserting the second capacitor into the charging path of the second capacitor;
Second charging switch turned on by charging trigger signal
An ignition device for an internal combustion engine, comprising: