JPH05106540A - Ignition device for internal combustion engine - Google Patents

Abstract

PURPOSE:To provide an ignition device for an internal combustion engine with which a capacitor charging voltage for deciding a discharge output voltage can be secured, and with which misfiring can be prevented even under an engine high rotation. CONSTITUTION:A voltage detecting means 31 for generating a voltage signal S7 indicating a charge voltage V7 of a first capacitor 7 reaching a predetermined voltage, a charge trigger circuit 32 for generating a charge trigger signal T6 in response to the voltage signal and a drive signal D, and a charge switching means 6A inserted in a charge circuit of a second capacitor 8 to be turned on by the charge trigger signal are provided. After the charge voltage of the first capacitor which is directly related with ignition reaches the predetermined value, a second capacitor for extending a charge time is charged.

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 internal combustion engine ignition device in which a discharge sustaining closed circuit is used to extend the discharge sustaining time, and particularly for determining the ignition coil output voltage even when the engine is running at high speed. The present invention relates to an ignition device for an internal combustion engine capable of reliably charging the capacitor.

[0002]

2. Description of the Related Art Conventionally, a capacitor discharge type internal combustion engine which charges a capacitor with a boosted voltage in advance and discharges the boosted voltage from the capacitor to the primary side of an ignition coil to generate a discharge in an ignition plug. Ignition devices (CDI) are well known. In this type of internal combustion engine ignition device,
In particular, in order to prevent misfire during cold start, a discharge sustaining closed circuit including an inductor is installed in parallel 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 block diagram showing a conventional ignition device for an internal combustion engine composed of LCDI. In the figure, reference numeral 1 is 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 switching transistor for boosting, that is, a power transistor 22 for generating boosted voltage from the boosting coil 21 by repeatedly interrupting energization of the boosting coil 21. In this case, the booster circuit 2 is composed of a DC-DC converter, and the booster coil 21 is provided on the secondary side of the booster transformer.

3 is an ignition signal G consisting of a timing pulse.
An ignition signal generating circuit 4 for generating a discharge trigger circuit 4 for generating 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 pass the boosted voltage.
Is the first and second capacitors (hereinafter, simply referred to as capacitors) that individually charge the boosted voltage via the diodes 5 and 6, and 9 is inserted between the charging side terminals of the capacitors 7 and 8 An inductor for extending the discharge duration, which stores discharge energy. In this case, the other ends of the capacitor 7 for determining the discharge output voltage and the capacitor 8 for extending the discharge duration are both grounded.

Reference numeral 10 is an ignition coil whose boosted voltage is supplied to the primary side when the capacitors 7 and 8 are discharged, and 11 is an ignition coil.
Spark plug connected to the secondary side of 10, 12 is the ignition coil 10
A reverse current blocking diode 13 for preventing current oscillation on the primary side of the discharge coil 13 is a discharge switching element or thyristor which is inserted between the primary side of the ignition coil 10 and the ground and turned on by a discharge trigger signal T.

Reference numeral 14 denotes a primary side of the ignition coil 10 and a thyristor.
It is a diode inserted between the connection point of 13 and the connection point of the capacitor 8 and the inductor 9, and constitutes a discharge sustaining closed circuit 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 form a first closed circuit for discharge, and the capacitor 8, the inductor 9, the primary side of the ignition coil 10 and the thyristor 13 form a second closed circuit for discharge. I am configuring.

15 is a power transistor for each ignition cycle
A drive circuit for generating a drive signal D to 22
By repeatedly turning on the power transistor 22, the discharged capacitors 7 and 8 are recharged with the boosted voltage from the booster circuit 2. The drive circuit 15 is based on the logic signal L and an oscillation circuit 15a that generates a clock signal C, a logic circuit 15b that performs a logical product of a clock signal C and a voltage signal S ₈ (described later) to generate a logic signal L. And a drive output circuit 15c for generating a drive signal D.
Reference numeral 30 denotes a voltage detection circuit for detecting the charging voltage V ₈ of the capacitor 8, which generates a voltage signal S ₈ indicating whether or not the charging voltage V ₈ is a predetermined voltage or less and inputs the voltage signal S ₈ to the logic circuit 15b 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 FIGS. 7 and 8. Normally, the capacitors 7 and 8 are charged with a predetermined boosted voltage by the booster circuit 2. In this state, the ignition signal G synchronized with the clock signal C from the ignition signal generation circuit 3 is generated at a predetermined ignition timing according to the request of the internal combustion engine.
Occurs, the discharge trigger signal T is generated from the discharge trigger circuit 4 at the falling timing of the ignition signal G.

By this discharge trigger signal T, the thyristor 13
Is turned on, 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 spark spark is generated in the spark plug 11 to generate a spark.
Similarly, the charging voltage V ₈ of the capacitor 8 is discharged via 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 when the discharge currents of the capacitors 7 and 8 become equal to or lower than the conduction holding current.

At this time, the discharge energy of the capacitor 8 is stored in the inductor 9 in the second discharge closed circuit, and this energy becomes a current for sustaining the discharge from the inductor 9 even after the discharge of the capacitors 7 and 8 is completed. 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.

Therefore, the spark plug 11 connected to the secondary side of the ignition coil 10 is discharged at the falling edge of the ignition signal G, and the discharge duration is extended while the current of the inductor 9 continues. 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 continuous discharge is about 2 seconds.
It is about 1.5 msec.

On the other hand, when the capacitors 7 and 8 are being discharged, the voltage detection circuit 30 detects the charging voltage V ₈ of the capacitor 8 and when the charging voltage V ₈ becomes a predetermined voltage or less, an L level voltage signal S ₈ is generated. 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, i.e. in response to the ignition signal G.

As a result, the logic circuit 15b causes the voltage signal S ₈
Passes the clock signal C during the L level period to generate the 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 interrupts energization of the power transistor 22 in the booster circuit 2.

Therefore, the input current of the boosting coil 21 synchronized with the drive signal D is supplied from the battery 1, and the 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 becomes H level, the logic signal L remains at L level, the drive signal D stops, and the capacitors 7 and 8 Prevent overcharging.

Here, as shown in FIG. 7, when the engine is not operating at a high speed during normal operation, the charging voltages V ₇ and V ₈ of the capacitors reach a predetermined voltage for each ignition cycle, so that ignition is performed. Ignition in response to the signal G is reliably performed. However, as shown in FIG. 8, at the time of high engine speed, the ignition cycle becomes short, and the ignition signal G is generated before the charging voltages V ₇ and V _{8 of} the capacitors reach a predetermined voltage, so that a sufficient charging voltage is obtained. Before this happens, the capacitors 7 and 8 may be discharged, and ignition may not be possible.

[0016]

As described above, the conventional ignition device for an internal combustion engine has each capacitor 7 for each ignition cycle.
Since 8 and 8 are charged at the same time, the charging voltages V ₇ and V ₈ cannot be ensured at the time of high engine rotation, and there is a problem that the discharge output voltage to the ignition coil 10 may decrease and misfire may occur.

The present invention has been made in order to solve the above-mentioned problems, and ensures the charge voltage of the capacitor for determining the discharge output voltage, and prevents misfire even at high engine speed. The purpose is to obtain an engine ignition device.

[0018]

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

Further, the ignition device for an internal combustion engine according to the invention of claim 2 of the present invention is configured such that the first and second charging trigger signals are generated in response to the operating state signal and the drive signal. A charging trigger circuit, a first charging switching means that is inserted into the charging path of the first capacitor and is turned on by the first charging trigger signal, and a second charging that is inserted into the charging path of the second capacitor. Second charging switching means that is turned on by a trigger signal is provided.

[0020]

According to the first aspect of the present invention, in view of the fact that misfire is unlikely to occur at the time of high engine speed without extending the discharge duration, the charging voltage of the first capacitor that directly contributes to ignition is 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 secured, and the charging voltage of the first capacitor is reduced to the minimum necessary voltage in an operating state in which misfire is unlikely to occur. Reduce.

[0022]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention,
1-5, 7-15 and 30 are the same as described above. 6A is a switching means for charging, that is, a thyristor, which is inserted in the charging path of the capacitor 8 instead of the diode 6, is connected to the output terminal of the booster circuit 2, and is turned on by the charging trigger signal T ₆ (described later). Reference numeral 19 is a diode for preventing backflow, which is inserted in series with the inductor 9 and includes a capacitor 7
To prevent the charging voltage V ₇ from discharging to the capacitor 8.

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

The operation of the embodiment of the present invention shown in FIG. 1 will now be described with reference to the waveform charts of FIGS. First, similarly to the above, when the ignition signal G is generated while the capacitors 7 and 8 are charged, the discharge trigger circuit 4 generates the discharge trigger signal T to turn on the thyristor 13 to charge the capacitors 7 and 8. The ignition coil 10
Discharges through the primary side and thyristor 13 and spark plug
Generate a spark at 11.

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 through the closed circuit for sustaining discharge including the diodes 14 and 19, and the discharge plug 11 Extend the discharge duration. Further, in order to recharge the capacitors 7 and 8 after discharging, the drive circuit 15 turns off the power transistor 22 in the booster circuit 2 by the drive signal D, and repeatedly supplies the input current to the boosting coil 21.

However, immediately after discharge, the capacitor 7
Since the charging voltage V ₇ is less than the predetermined voltage, the voltage detecting circuit 31 outputs the L level voltage signal S ₇ , and the charging trigger circuit 32 does not output the charging trigger signal T ₆ . Therefore, 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, and the charge trigger circuit 32 outputs a trigger pulse P _T from the monostable multivibrator 33 synchronized with the logic signal L 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 charge 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 suppressing. 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
Also, the charging trigger signal T ₆ is not output and the charging operation ends.

During normal operation as shown in FIG. 2, the ignition signal G
However, the charging voltage V _{8 of the} capacitor 8 becomes insufficient because the cycle of the ignition signal G is short at the time of high engine speed as shown in FIG. However, since the possibility of misfire at the time of high engine speed is extremely low, it is not necessary to extend the discharge time, and there is no problem even if the charging voltage V ₈ of the capacitor 8 for extending the discharge time is low.

Example 2. In the above embodiment, the step-up circuit 2 is composed of a DC-DC converter and the step-up coil 21 is provided on the secondary side. However, as shown in FIG. Alternatively, the booster circuit 2A may be used.

In FIG. 4, 15A is a drive circuit for generating a drive signal D'based on the delay pulse P and the current signal I (described later), and 16 is a delay pulse P synchronized with the rising timing of the ignition signal G. Drive circuit 15
A monostable multivibrator input to A, 17 is a current detection circuit that detects the current flowing in the power transistor 22 and inputs the current signal I to the drive circuit 15A, and 18 is a diode
A backflow prevention diode inserted in the discharge path of the capacitor 7 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 a delay means for preventing the power transistor 22 from turning on during the discharge duration. In this case, the anode of the battery 1 is not the ground but the common terminal. Further, the diode 14 shown in FIG. 1 is 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 configured.

Reference numeral 35 denotes a first charge trigger circuit (hereinafter, simply referred to as a charge trigger circuit), which responds to an operation state signal such as an engine speed signal R and a logic signal L related to the drive signal D. Charging trigger signal T ₅ (hereinafter, simply referred to as a charging trigger signal) is generated. 36 is the rotation speed signal R,
A second charge trigger circuit (hereinafter, simply referred to as a charge trigger circuit) that generates a second charge trigger signal T ₆ ′ (hereinafter, simply referred to as a charge trigger signal) in response to the voltage signal S ₇ and the logic signal L. ..

Numeral 51 is a first charging switching means or thyristor which is inserted in the charging path of the capacitor 7 and turned on by the charging trigger signal T _{5, and} numeral 52 is connected in reverse parallel to the thyristor 51 and is a closed circuit for discharging the capacitor 7. The second charging switching means or thyristor 61 is inserted in the charging path of the capacitor 8 and turned on by the charging trigger signal T ₆ ′, and 62 is connected in antiparallel to the thyristor 61 to discharge the capacitor 8. It is a diode that constitutes a closed circuit for use.

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 the charge trigger circuits 35 and 36, and the capacitor 7 required depending on the operating condition can be changed. The charging voltage V ₇ can be secured. Particularly, in an operating state where 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 necessary minimum voltage.

That is, in the high engine speed region where the rotation speed signal R is equal to or higher than a predetermined value, it is not necessary to extend the discharge time, and the charging voltage V _{7 of the} capacitor 7 that directly contributes to ignition can be low, so that the charging trigger circuit. 35 and 36, reduces the incidence of charge trigger signal T ₅ and T ₆ 'between ignition cycles.
Furthermore, it is possible not to generate the charging trigger signal T ₆ ′ in the high rotation region. At this time, even if the charging voltages V ₇ and V ₈ of the capacitors 7 and 8 are different from each other, the diodes 18 and 19 are inserted, so that when the charging voltages V ₇ and V ₈ are high, the other voltage is applied to the other. The charging voltage is maintained without being discharged.

FIG. 5 shows the operation waveforms when the thyristors 51 and 61 are always turned on, and the capacitors 7 and 8 are shown.
Are charged at the same time. In this case, the inductor 9 after discharge
The current due to the stored energy of the current 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 is
While the current for sustaining the discharge is flowing, since the conduction holding current is secured, it is not turned off.

On the other hand, in order to charge the boosted voltage to the capacitors 7 and 8 after discharging again, it is necessary to supply an input current to the boosting coil 21 by the drive signal D ', but the monostable multivibrator 16 uses the ignition signal. In synchronization with G, a delay pulse P having a pulse width longer than the ignition signal G is generated for a time corresponding to the required discharge duration, and the drive circuit 15A drives the drive signal D'at the falling timing of the delay pulse P.
To generate. As a result, the power transistor 22 is held in the off state during the discharge duration time during which the secondary current of the spark plug 11 is flowing, and the current of the inductor 9 falls to the ground via the power transistor 22 and the current detection circuit 17. Without passing through, it continues to flow to the primary side of the ignition coil 10 via the boosting coil 21.

Further, the drive circuit 15A drives each 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 when the capacitors 7 and 8 are charged by the drive signal D '. Signal D '
Shut off. As a result, the input current value of the boosting coil 21 that is periodically interrupted is secured to be constant, the capacitors 7 and 8 are reliably charged, and the power transistor 22
The value of the current flowing through is limited. Therefore, the power transistor 22 is not destroyed by an overcurrent, and the power transistor 22 can be downsized.

In the above embodiment, the rotation speed signal R is used as the operating condition signal, but other operating condition signals such as a temperature signal may be used. Further, the charging voltage V ₇ of the capacitor 7 is prioritized by using the voltage signal S ₇ from the voltage detection circuit 31, but the charging trigger signal T ₆ ′ is generated based on only the operation state signal without using the voltage detection circuit 31. The thyristor 61 may be generated and the thyristor 61 may be turned on after the thyristor 51. Furthermore, if it is determined that the charging voltage V ₇ is equal to or higher than the predetermined voltage depending on the operating state, the capacitor 8 can be charged before the capacitor 7.

As shown in each of 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, the boosted voltage may be generated by simply repeating the interruption of the power supply to the boosting coil 21, and the boosted voltage is generated from the secondary side of the boosting transformer by using the DC-DC converter including the boosting transformer. It may be generated. Further, although the case where one cylinder is driven is shown, the ignition coil 10, the spark plug 11 and the thyristor are shown.
It goes without saying that the present invention can also be applied to the case of driving a plurality of cylinders each including 13 individually.

[0042]

As described above, according to the first aspect of the present invention, the voltage detecting means for generating the voltage signal indicating that the charging voltage of the first capacitor has reached the predetermined voltage,
A charge trigger circuit that generates a charge trigger signal in response to a voltage signal and a drive signal, and a charging switching means that is inserted into the charging path of the second capacitor and turned on by the charge trigger signal are provided, and contributes directly to ignition. Since the second capacitor for extending the discharge time is charged after the charging voltage of the first capacitor reaches a predetermined voltage, the charging voltage of the capacitor for determining the discharge output voltage is secured, and the engine high rotation speed is maintained. There is an effect that an ignition device for an internal combustion engine can be obtained which can prevent misfire even at times.

According to the second aspect of the present invention,
First and second in response to the operating state signal and the drive signal
First and second charging trigger circuits that generate the charging trigger signal of the first capacitor, first charging switching means that is inserted into the charging path of the first capacitor and that is turned on by the first charging trigger signal, Inserted in the charging path of the capacitor of the
The second charging switching means that is turned on by the second charging trigger signal is provided to secure the charging voltage of the first capacitor, and the charging voltage of the first capacitor is the minimum required in the operating state in which misfire is hard to occur. Since the voltage is reduced to the limit voltage, the charging voltage of the capacitor for determining the discharge output voltage is secured, and there is an effect that an ignition device for an internal combustion engine capable of preventing misfire even at high engine speed is obtained. ..

[Brief description of drawings]

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

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

FIG. 3 is a waveform diagram for explaining the operation at the time of high speed operation of the embodiment of the present invention.

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

FIG. 5 is a waveform diagram for explaining the 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 diagram for explaining the operation of the conventional ignition device for an internal combustion engine during normal operation.

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

[Explanation of symbols]

2, 2A Booster circuit 21 Booster coil 22 Booster switching element 4 Discharge trigger circuit 6A Charging switching means 7 First capacitor 8 Second capacitor 9 Inductor 10 Ignition coil 11 Spark 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 charging switching means 61 Second charging switching means D, D'Drive signal G Ignition signal R Rotation Number signal (operation status 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 charge voltage

[Procedure amendment]

[Submission date] October 20, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

FIG. 6 is a block diagram showing a conventional ignition device for an internal combustion engine composed of LCDI. In the figure, reference numeral 1 is 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 switching transistor for boosting, that is, a power transistor 22 for generating boosted voltage from the boosting coil 21 by repeatedly interrupting energization of the boosting coil 21 .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

3 is an ignition signal G consisting of a timing pulse.
An ignition signal generating circuit 4 for generating a discharge trigger circuit 4 for generating 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 pass the boosted voltage.
Is a first and a second capacitor (hereinafter, simply referred to as a capacitor) that individually charges the boosted voltage via the diodes 5 and 6 in response to the operation of the booster circuit 2 , and 9 is a charging side of the capacitors 7 and 8. An inductor for extending the discharge duration, which is inserted between the terminals and stores 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 also grounded.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

15 is a power transistor for each ignition cycle
A drive circuit for generating a drive signal D to 22
Drive the power transistor 22 repeatedly (repeat
The capacitor 7 after discharge is turned on and off.
And 8 are recharged with the boosted voltage from the booster circuit 2. The drive circuit 15 includes an oscillator circuit 15a that generates a clock signal C.
With the a logic circuit 15b for generating a logic signal L by taking the logical product of the clock signal C and the voltage signal S ₈ (described later), and a drive output circuit 15c which generates a drive signal D based on the logic signal L ing. Reference numeral 30 denotes a voltage detection circuit for detecting the charging voltage V ₈ of the capacitor 8, which generates a voltage signal S ₈ indicating whether or not the charging voltage V ₈ is a predetermined voltage or less and inputs the voltage signal S ₈ to the logic circuit 15b in the drive circuit 15. ..

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

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 FIGS. 7 and 8. 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 generating circuit 3 at a predetermined ignition timing according to the request of the internal combustion engine, the ignition signal G
The discharge trigger signal T is generated from the discharge trigger circuit 4 at the falling timing of.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

[0016]

As described above, the conventional ignition device for an internal combustion engine has each capacitor 7 for each ignition cycle.
Since 8 and 8 are charged at the same time, the charging voltage V ₇ cannot be ensured at the time of high engine speed, and there is a problem that the discharge output voltage to the ignition coil 10 is lowered and there is a risk of misfire.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

During normal operation as shown in FIG. 2, the ignition signal G
However, the charging voltage V _{8 of the} capacitor 8 becomes insufficient because the cycle of the ignition signal G is short at the time of high engine speed as shown in FIG. However, at the time of high engine speed, it is not necessary to extend the discharge time due to the demand of the engine, and there is no problem even if the charging voltage V ₈ of the capacitor 8 for extending the discharge time is low.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

Example 2. In the above embodiment, the case where the booster circuit 2 is composed of a booster transformer is shown, but a booster circuit 2A that directly shuts off energization of the booster coil 21 may be used as shown in FIG.

Claims (2)

[Claims] 1. A step-up coil including a step-up coil and a step-up switching element for generating a step-up voltage from the step-up coil, and a drive signal for turning on the step-up switching element in response to an ignition signal. A drive circuit for generating, first and second capacitors for charging the boosted voltage in response to the drive signal, an ignition coil having an ignition plug connected to a secondary side, the first capacitor and the ignition A discharge switching element that constitutes a first closed circuit for discharge together with the primary side of the coil and is turned on in synchronization with the ignition signal; the second capacitor, the primary side of the ignition coil, and the discharge switching element. And an inductor that forms a second closed circuit for discharge and stores discharge energy of the second capacitor, and is synchronized with the ignition signal. A discharge trigger circuit for generating a discharge trigger signal to turn on the discharge switching element, and changing the charging voltage of the first and second capacitors by the discharge trigger signal to close the first and second discharges. A discharge is generated through a circuit to generate a discharge in the spark plug, and a current generated by the energy stored in the inductor is supplied to a discharge sustaining closed circuit including the primary side of the ignition coil to sustain the discharge of the spark plug. In an internal combustion engine ignition device for extending time, voltage detection means for generating a voltage signal indicating that the charging voltage of the first capacitor has reached a predetermined voltage, and charging in response to the voltage signal and the drive signal. A charge trigger circuit for generating a trigger signal, and a charge trigger circuit inserted in the charge path of the second capacitor and turned on by the charge trigger signal. And use switching means, the provided, the first ignition device for an internal combustion engine, which comprises charging the second capacitor after the charge voltage reaches a predetermined voltage of the capacitor. 2. A step-up coil including a step-up coil and a step-up switching element for generating a step-up voltage from the step-up coil, and a drive signal for turning on the step-up switching element in response to an ignition signal. A drive circuit for generating, first and second capacitors for charging the boosted voltage in response to the drive signal, an ignition coil having an ignition plug connected to a secondary side, the first capacitor and the ignition A discharge switching element that constitutes a first closed circuit for discharge together with the primary side of the coil and is turned on in synchronization with the ignition signal; the second capacitor, the primary side of the ignition coil, and the discharge switching element. And an inductor that forms a second closed circuit for discharge and stores discharge energy of the second capacitor, and is synchronized with the ignition signal. A discharge trigger circuit for generating a discharge trigger signal to turn on the discharge switching element, and changing the charging voltage of the first and second capacitors by the discharge trigger signal to close the first and second discharges. A discharge is generated through a circuit to generate a discharge in the spark plug, and the energy stored in the inductor is supplied to a discharge sustaining closed circuit including the primary side of the ignition coil, and the discharge duration of the spark plug is increased. In an ignition device for an internal combustion engine to be extended, first and second charge trigger circuits that generate first and second charge trigger signals in response to an operating state signal and the drive signal, and charging of the first capacitor A first charging switching means that is inserted in a charging path and turned on by the first charging trigger signal; and is inserted in a charging path of the second capacitor. Serial second and the second charge switching means which is turned on by the charging trigger signal, ignition device for an internal combustion engine, characterized in that a.