JP3252733B2 - Internal combustion engine ignition device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor discharge type ignition device for an internal combustion engine.

[0002]

2. Description of the Related Art In recent years, air pollution by exhaust gas of an internal combustion engine has become a social problem, and there is a strong demand for purifying the exhaust gas of the internal combustion engine. In particular, in a two-stroke engine, since the exhaust gas is contaminated by blow-by (a phenomenon in which part of fresh air blows into an exhaust port during scavenging), the necessity of purifying the exhaust gas is emphasized. Various researches are being conducted in order to take countermeasures.

As one method for preventing blow-by in a two-cycle engine, an injector (fuel injection valve) is mounted on a cylinder of the engine.
And in-cylinder injection for injecting fuel directly into the cylinder is about to be performed. When performing this in-cylinder injection, fuel injection is performed after the exhaust port is closed,
Alternatively, the fuel injection timing is set so that the injected fuel does not reach the exhaust port or the scavenging port, and the fuel is ignited by generating a spark at the ignition plug at a predetermined ignition position. To burn.

In order to purify the exhaust gas, it is necessary to completely burn the fuel, and for that purpose, it is necessary that the fuel is sufficiently vaporized at the time of ignition. is there.

In order to perform in-cylinder injection, it is necessary to vaporize the fuel in a short period of time from when the fuel is injected to when the ignition is performed. Therefore, a device for promoting vaporization is required.
Generally, in order to promote the vaporization of the injected fuel, it is necessary to reduce the particle size of the injected fuel as much as possible, for which, for example, by increasing the pressure of the fuel supplied to the injector from a fuel pump. It is said that it is effective.

[0006] However, no matter what measures are taken to promote the vaporization of the fuel, in practice, it often does not go as desired, and especially when the engine is running at high speed, the ignition is performed after the fuel is injected. Since the time until the operation is performed is extremely short, it is often difficult to sufficiently vaporize the injected fuel.

If ignition is performed in a state where the fuel is not sufficiently vaporized, soot is generated because the fuel is not completely burned, and carbon adheres to the electrode portion of the ignition plug. If carbon adheres to the electrode portion of the spark plug, the dielectric strength between the non-ground side electrode and the ground side electrode decreases, so that when an ignition voltage is applied to the spark plug, a leakage current flows and the electrode The voltage applied to the electrodes may decrease, and the generation of sparks may fail. In order to restore the carbon-attached ignition plug to a normal state, it is necessary to apply a large current to the ignition plug from the ignition device to burn off the carbon attached to the electrode portion of the ignition plug.

Further, in order to purify exhaust gas by performing in-cylinder injection, it is necessary to perform combustion by reducing the concentration of the air-fuel mixture (as a lean air-fuel mixture). In order to completely burn the lean air-fuel mixture, it is necessary to make the duration of the spark discharge generated during the ignition operation sufficiently long. If the duration of the spark discharge is extended, energy can be injected into the center of the flame nucleus generated by the combustion of the air-fuel mixture to prevent the flame nucleus from cooling. Becomes possible.

Therefore, the internal combustion engine igniter for performing in-cylinder injection can supply a sufficiently large current to the ignition plug and sufficiently increase the discharge duration to satisfy the above two requirements. It is desirable to be able to do it.

In an ignition device for an internal combustion engine, an electric charge stored in an ignition energy storage capacitor provided on a primary side of the ignition coil is discharged through the primary coil of the ignition coil at an ignition position, so that the ignition coil is recharged. A capacitor discharge type ignition device for generating a high voltage for ignition in a secondary coil, and a current flowing through a primary coil of an ignition coil or an ignition power supply coil connected in parallel to the primary coil is cut off at an ignition position. There is known a current interruption type ignition device that generates a high voltage for ignition in a secondary coil of the ignition coil.

Among them, the capacitor discharge type ignition device can obtain a large amount of current that can flow from the secondary coil of the ignition coil to the ignition plug, but has a problem that the discharge duration is short. . On the other hand, the current interruption type ignition device has a problem in that the discharge duration can be lengthened, but the current flowing from the secondary coil of the ignition coil to the ignition plug cannot be increased.

Therefore, the output voltage of the battery is set to 1000
Using a DC-DC converter that boosts the voltage from [V] to 1500 [V] as a power source for a capacitor discharge type ignition device, an ignition energy storage capacitor is charged by the output voltage of the converter, and the output voltage of the converter is reduced. There has been proposed a lap discharge type capacitor discharge type internal combustion engine ignition device in which the duration of discharge is extended by superimposing it on the secondary output voltage of an ignition coil.

According to this ignition device, after a spark is generated in the ignition plug by using the secondary induced voltage of the ignition coil as a trigger, energy is supplied to the discharge gap of the ignition plug by the output voltage of the DC-DC converter to discharge. Since the current can continue to flow, the duration of the spark discharge can be lengthened, and the lean air-fuel mixture can be favorably burned. When carbon adheres to the electrode of the spark plug and a leak current flows between the electrodes, DC-D
Since a large leak current can flow from the C converter between the electrodes of the spark plug to burn off the carbon attached to the electrodes, the spark plug can be restored to a normal state.

[0014]

In a conventional internal combustion engine igniter in which an output voltage of a DC-DC converter is superimposed on an induced voltage of a secondary coil of a capacitor discharge type igniter to perform an overlap discharge, If the output impedance of the DC-DC converter is set to be small, the discharge current flowing from the DC-DC converter to the spark plug does not attenuate forever, so that the ignition spark cannot be extinguished. In order to extinguish the spark at an appropriate time, DC
-It is necessary to suppress the discharge current by increasing the output impedance of the DC converter to increase the voltage drop caused by the output impedance of the converter when the discharge current flows from the converter to the spark plug. However, when the output impedance of the DC-DC converter is increased, it takes time to charge the ignition energy storage capacitor provided on the primary side of the ignition coil by the converter. A problem arises in that the charging voltage of the ignition energy storage capacitor is insufficient and the ignition performance is reduced.

In the above-described ignition device, a battery is used as a power source. However, if a battery is used as a power source for the ignition device, the engine cannot be operated when the battery is over-discharged. Occurs. In particular, in the case of an internal combustion engine used for an outboard motor, a snowmobile, or the like, if the engine cannot be operated, an occupant may be distressed. Therefore, it is not preferable to use a battery-powered ignition device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a capacitor discharge type internal combustion engine ignition system capable of increasing the duration of discharge by causing lap discharge during ignition operation without deteriorating ignition performance at high speed. It is to provide a device.

Another object of the present invention is to provide a large current flowing between the electrodes of the ignition plug to burn off the carbon when the carbon adheres to the electrodes of the ignition plug and a leak current flows. It is an object of the present invention to provide an ignition device for an internal combustion engine that can restore a plug to a normal state.

[0018]

According to the present invention, there is provided a magnet generator provided to rotate synchronously with an internal combustion engine, an ignition coil, and a primary side of the ignition coil provided in the magnet generator. An ignition energy storage capacitor that is charged to one polarity by the output voltage of the exciter coil, and that conducts when an ignition signal is applied to discharge the charge stored in the ignition energy storage capacitor through the primary coil of the ignition coil And an ignition position control means for supplying an ignition signal to the discharge switch at the ignition position of the internal combustion engine. The present invention relates to a capacitor discharge type internal combustion engine ignition device for inducing a high voltage for ignition in a secondary coil.

In the present invention, a lap discharge power generating coil for generating an output voltage of one half cycle at a rotational angle position advanced in phase from the ignition position of the internal combustion engine is provided separately from the exciter coil in the magnet generator. A booster which is turned on when the output voltage of one half cycle of the overlapping discharge power generation coil rises and is turned off at an ignition position or a rotation angle position slightly delayed from the ignition position. Semiconductor switch is connected in parallel to the overlapping discharge power generation coil. Then, when the boosting semiconductor switch is turned off, a voltage obtained by superimposing the voltage induced in the power generation coil for lap discharge and the high voltage for ignition with the same polarity is output as the output voltage of the ignition device, so that the lap discharge is performed. The power generation coil for use and the secondary coil of the ignition coil are connected.

As described above, in order to superimpose the output voltage of the overlapping discharge power generation coil on the output voltage of the secondary coil of the ignition coil with the same polarity, the ignition high voltage is used when the boosting semiconductor switch is turned off. May be provided so as to generate an overlapping discharge voltage having the same polarity as the above-mentioned polarity, and the overlapping discharge generating coil may be connected in series to the secondary coil of the ignition coil.

In the above igniter, when the overlapping discharge power generating coil generates a voltage of a half cycle of one polarity at the rotation angle position advanced from the ignition position, the boosting semiconductor switch becomes conductive and the overlapping discharge power generating coil is turned on. The coil is short-circuited, and a short-circuit current flows through the power generation coil. When an ignition signal is generated at the ignition position, the discharge switch conducts, so that the charge of the ignition energy storage capacitor is discharged through the discharge switch and the primary coil of the ignition coil, and the high voltage for ignition is applied to the secondary coil of the ignition coil. Is induced. Further, since the boosting semiconductor switch is turned off at the ignition position or at a rotation angle position slightly delayed from the ignition position, a high overlapping discharge voltage is induced in the overlapping discharge generating coil. This overlapping discharge voltage is superimposed with the same polarity on the ignition high voltage induced in the secondary coil of the ignition coil by the discharge of the ignition energy storage capacitor, and applied to the ignition plug.

When a high voltage for ignition is generated, spark discharge occurs in the discharge gap of the spark plug. At the same time as the ignition high voltage is generated or immediately after the ignition high voltage is generated,
Since the voltage for the overlapping discharge having a long duration is induced in the power generating coil for the overlapping discharge, and the voltage for the overlapping discharge is applied to the discharge gap of the spark plug, the discharge is performed even after the high voltage for the ignition is attenuated. The high voltage generated when the short circuit of the lap discharge power generation coil is opened is a voltage having a wide time width similarly to the high voltage for ignition obtained by the current interruption type ignition device. The duration of spark discharge that occurs sometimes can be sufficiently long, and even if the air-fuel mixture in the cylinder is a lean air-fuel mixture, the combustion can be favorably performed.

When carbon adheres to the electrode of the spark plug and a leak current flows, a large voltage is applied to the igniter coil for lap discharge, and a high voltage having a long duration induces a large leak current through the electrode of the spark plug. Since the carbon can be burned off by flowing, the ignition plug can be quickly restored to a normal state and the ignition operation can be restarted.

As described above, according to the present invention, when carbon adheres to the spark plug, not only can the carbon be burned off to restore the spark plug to a normal state, but the duration of spark discharge can be extended. As a result, the lean air-fuel mixture can be satisfactorily burned, so that the probability of occurrence of an ignition error can be reduced, the harmful substances in the exhaust gas can be reduced, and the exhaust gas can be purified.

As described above, without connecting a semiconductor switch in parallel to the lap discharge coil, a lap discharge coil having a sufficiently high no-load output voltage is used. It is conceivable that superimposed discharge is performed by superimposing the output voltage itself of the half cycle of the same cycle on the high voltage for ignition with the same polarity, but in this case, it is necessary to use a coil with a large number of turns as the superposed discharge power generation coil. Therefore, there is a problem that the space occupied by the overlapping discharge power generation coil in the magnet generator is increased, and the space for providing another power generation coil is reduced. Also, if the number of turns of the lap discharge coil is increased and the no-load output voltage is set high so that the lap discharge is performed when the engine is rotating at a low speed, the lap discharge coil is set at a time other than the ignition timing at high engine speed. The ignition voltage may be generated at the output voltage of

On the other hand, according to the present invention, the lapping discharge power generating coil only needs to induce a high voltage when the short-circuit current is cut off by the boosting semiconductor switch whose on / off control is performed. , The overlapping discharge power generation coil may be a coil having a small number of turns, and can be provided without greatly sacrificing the coil winding space of the magnet generator. In the case of the present invention,
At times other than the ignition timing, the output voltage of one half cycle of the lap discharge coil is short-circuited by the semiconductor switch, so that it is possible to prevent an extra voltage from being applied to the ignition plug at a time other than the ignition timing. It is possible to prevent ignition spark from being generated at a time other than the time.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a configuration for one cylinder of an internal combustion engine ignition device according to the present invention. In FIG. 1, 1 is a magnet generator provided to rotate synchronously with an internal combustion engine, 2 is a signal generator for generating a signal for giving rotation angle information and rotation speed information of the engine, and 3 is a primary coil 3a and a secondary coil. An ignition coil having a coil 3b; 4, an ignition circuit for controlling the primary current of the ignition coil 3; 5, an ignition control unit;
Is a boosting semiconductor switch, and 7 is a spark plug attached to a cylinder of the internal combustion engine.

The magnet generator 1 comprises a magnet rotor 1A attached to the crankshaft of the engine and a stator 1B. The magnet rotor 1A includes a flywheel 100 formed in a cup shape from a ferromagnetic material such as iron, and a permanent magnet 101 fixed to the inner periphery of the peripheral wall of the flywheel. A boss 102 provided at the center of the bottom wall is attached to a crankshaft of an internal combustion engine (not shown). In the illustrated example, the permanent magnet 101 is magnetized into two poles to form a two-pole magnet field.

The stator 1B is disposed inside the magnet rotor 1A, and has an iron core having a magnetic pole portion opposed to the magnetic pole of the rotor, and power generating coils W1 and W wound around the iron core.
2 and is fixed to a stator mounting portion provided in a case of an internal combustion engine or the like. Generating coil W1
Is a coil used as an exciter coil for charging an ignition energy storage capacitor, so as to induce a voltage of 200 to 300 [V] even at a low speed of the engine.
It is wound to have a sufficiently large number of turns using a relatively thin coil conductor. The power generation coil W2 is used as a lap discharge power generation coil, and is wound so as to have a smaller number of turns than the exciter coil.
In this example, since the magnet rotor 1A has two poles, the exciter coil W1 and the lap discharge electric power generation coil W
2 outputs one cycle of AC voltage per revolution of the engine.

On the outer periphery of the flywheel 100, a reluctor 103 formed of an arc-shaped projection extending in the circumferential direction of the flywheel is formed. Are opposed to each other. The signal generator 2 has a well-known structure including an iron core having a magnetic pole portion at the tip thereof, the pulsar coil Wp wound around the iron core, and a permanent magnet magnetically coupled to the iron core. The first pulse signal Vp1 and the second pulse signal Vp2, which have different polarities, are applied to the pulsar coil Wp due to changes in magnetic flux generated when the signal starts to face the magnetic pole portion of the iron core of the signal emitting electron and when the facing ends. Induce. The signal generator 2 is composed of the signal generator 2 and the flywheel 100 provided with the reluctor 103. This signal generator generates a first pulse signal Vp1 at a reference position set at, for example, the maximum advance position of the ignition position or a position further advanced in phase from the maximum advance position, and the top dead center of the engine is generated. The second pulse signal Vp2 is generated at a rotation angle position slightly advanced from the point (ignition position at low speed of the engine). The first and second pulse signals Vp1 and Vp2 are used as signals for providing rotation angle information and rotation speed information of the internal combustion engine.
Has been given to.

The ignition circuit 4 includes an ignition energy storage capacitor C1 and a thyristor Th constituting a discharge switch.
And diodes D1 and D2.
The ignition energy storage capacitor C1 is connected between one end of the primary coil 3a of the ignition coil 3 and ground, and the thyristor Th is connected between the other end of the primary coil 3a and ground with the cathode facing the ground. ing. One end of the exciter coil W1 is grounded, and the non-ground side terminal of the exciter coil is connected to a connection point between the capacitor C1 and the primary coil 3a through a diode D1 whose anode is directed toward the exciter coil. Primary coil of ignition coil 3
A diode D2 whose anode is directed to the anode side of the thyristor Th is connected to both ends of a.

One end of a secondary coil 3b of the ignition coil 3 is connected to a non-ground side terminal of the ignition plug 7 through a high-voltage cord, and the other end of the secondary coil 3b is connected to a lap discharge power generation coil W2.
Is connected to one end. The other end of the lap discharge power generation coil W2 is grounded, and the secondary coil 3b and the lap discharge power generation coil W2 are connected in series.

The generating coil W2 for lap discharge generates an output voltage of one half cycle at a position advanced from the ignition position of the internal combustion engine, and generates an output voltage of one half cycle at a position delayed from the ignition position. It is provided to make it fall.

The boosting semiconductor switch 6 is composed of a diode D3 having an anode connected to the non-ground side terminal of the lap discharge power generating coil W2, an IGBT (insulated gate) having a collector connected to the cathode of the diode D3 and a grounded emitter. Type bipolar transistor) B1
The control signal V from the ignition control unit 5 is applied to the gate of BT B1.
g is given.

The ignition control unit 5 includes a microcomputer. The microcomputer executes a predetermined program to provide an ignition signal Vi to a thyristor Th constituting a discharge switch at an ignition position of the internal combustion engine. A position control means and a boost switch control means for providing a control signal Vg to the gate of the IGBT constituting the boost semiconductor switch 6 are realized.

The ignition position control means includes, for example, a rotation speed calculation means for calculating the rotation speed of the engine from an interval between the first pulser signal Vp1 and the second pulse signal Vp2 generated by the signal emission 2, and an arithmetic operation. Ignition position calculating means for calculating the ignition position at the calculated rotation speed using a map or an arithmetic expression; and an ignition signal Vi when the calculated ignition position is detected.
And ignition signal generating means for generating The ignition position calculating means is configured to control each rotation in the form of a count value of a clock pulse to be counted by a timer in the microcomputer while the internal combustion engine rotates from the reference position (the position where the first pulse signal Vp1 is generated) to the ignition position. Calculate the ignition position at speed. When it is detected that the first pulse signal has been generated, the ignition signal generation means sets a count value for measuring the ignition position in a timer, starts counting the count value, and sets the timer. When the counting of the count value is completed, an ignition signal is generated.

The ignition position control means for generating an ignition signal at the ignition position of the internal combustion engine is not limited to the above configuration. For example, there is a case where an encoder that generates a pulse signal every time the internal combustion engine rotates by a small rotation angle is provided, and an ignition position calculated by counting output pulses of the encoder is detected. In some cases, an ignition signal is generated using only a hardware circuit without using a microcomputer.

IGB constituting the boosting semiconductor switch 6
The control signal Vg for controlling T B1 is maintained at a high level from the rotation angle position where the phase is advanced from the ignition position to the ignition position, then drops to zero level at the ignition position, and the zero level state is kept constant. It is a signal that goes high after a period of time. The boosting semiconductor switch 6 receives the control signal Vg
Thus, when the output voltage of one half cycle of the overlapping discharge power generation coil W2 rises, it is turned on, and is controlled to be cut off at the ignition position.

When the step-up semiconductor switch 6 is turned off at the ignition position, the short-circuit current that has been flowing through the power generation coil W2 for lap discharge is cut off, and the power generation coil W2 is turned off.
, A high overlapping discharge voltage V2h is induced. In the ignition device shown in FIG. 1, the overlapping discharge power generation coil is set in such a state that the overlapping discharge voltage V2h is superposed with the same polarity so as to be superimposed with the same polarity on the ignition high voltage Vh induced in the secondary coil 3b of the ignition coil. W2 and the secondary coil 3b are connected in series. The overlapping discharge voltage V2h is set to, for example, about 1000 to 1500 [V].

In the internal combustion engine ignition device shown in FIG.
The exciter coil W1 outputs one cycle of the AC voltage V1 during one revolution of the engine. The output voltage of one half cycle of the exciter coil W1 charges the capacitor C1 through the diode D1 to the polarity shown. As shown in FIG. 2A, the ignition position θ of the internal combustion engine
i, when the ignition signal Vi is generated, the thyristor Th
Is conducted, the electric charge of the capacitor C1 is changed to the thyristor T
h and discharge through the primary coil 3a of the ignition coil.
This discharge induces a high ignition voltage Vh in the secondary coil 3b of the ignition coil 3. As shown in FIG. 2B, the gate of the IGBT B1 of the boosting semiconductor switch 6 becomes a zero level when an ignition signal is generated at the ignition position θi, and the state of the zero level is maintained for a certain period of time. After doing
A control signal Vg having a waveform returning to a high level is applied.
Therefore, the IGBT B1 is provided with the lap discharge power generation coil W
2 generates an output voltage of one half cycle (positive half cycle in the example of FIG. 2C) and conducts to cause a short-circuit current to flow to the power generation coil W2. Cut off. When the short-circuit current of the overlapping discharge generating coil W2 is cut off at the ignition position, a high overlapping discharging voltage V2h is induced in the generating coil W2, and this overlapping discharging voltage V2
2h and the ignition high voltage Vh are superposed with the same polarity and applied to the ignition plug 7. As a result, a spark discharge is generated in the spark plug 7, and a discharge current i2 flows as shown in FIG. The overlap discharge voltage V2h is a voltage having a long duration like the voltage obtained when the current flowing through the coil is interrupted in the current interruption type ignition device, so that the overlap discharge voltage V2h is ignited as described above. When the high voltage for ignition is superimposed on the high voltage Vh with the same polarity and applied to the ignition plug, the discharge is continued even after the high voltage for ignition Vh disappears, and an ignition spark having a long duration can be obtained.

In the case of a magnet generator, since the short-circuit current is not greatly affected by the number of revolutions of the generator, the voltage induced when the short-circuit current is interrupted should be substantially constant irrespective of the engine speed. And an overlapping discharge can be generated from a low speed to a high speed of the engine.

In the ignition device shown in FIG. 1, the period during which the control signal Vg is set to zero level is set to be sufficiently longer than the duration of the lap discharge voltage induced in the lap discharge power generation coil W2. Further, the control signal Vg is set to a high level at a position advanced from a position at which the overlap discharge power generation coil outputs a voltage of one half cycle, for example.

As described above, according to the present invention, a spark discharge having a long duration can be generated in the ignition plug at the ignition position, so that even when the mixture in the cylinder of the engine is a lean mixture, Combustion can be favorably performed.

When carbon adheres to the electrode of the ignition plug 2 and a leak occurs between the electrodes, the voltage of the electrode of the ignition plug 2 is increased by the high voltage having a long duration induced in the power generation coil W2 for lap discharge. Since a large leak current flows through the gap to burn off the carbon adhered to the electrode, the electrode of the spark plug can be restored to a normal state.

With the above configuration, the lap discharge power generating coil generates a high lap discharge voltage only when the ignition operation is performed. Therefore, a spark is generated in the ignition plug by the output of the lap discharge power generating coil. Can be prevented.

In the above example, the ignition energy storage capacitor C1 is connected between one end of the primary coil 3a of the ignition coil and the ground, but the configuration of the circuit on the primary side of the ignition coil is not limited to the above example. For example, in FIG. 1, the capacitor C1 is connected between one end of the primary coil 3a and the cathode of the diode D1, and the other end of the primary coil 3a is grounded, and between the connection point of the capacitor C1 and the diode D1 and ground. A well-known circuit for connecting the thyristor Th can also be used. In this case, the diode D
2 is the primary coil 3 with its cathode facing the ground side.
a in parallel.

In the above example, the magnet generator has two poles. However, the present invention can be applied to a case where a multi-pole magnet generator is used.

In the above example, the boosting semiconductor switch 6 is turned off at the ignition position. However, the semiconductor switch 6 is turned off at a position slightly later than the ignition position. Is also good.

In the example shown in FIG. 1, the exciter coil W
Although only one is provided, both a low-speed exciter coil that generates a high voltage at a high speed of the engine and a high-speed exciter coil that generates a high voltage at a high speed of the engine are provided. The present invention can be applied to a case where a circuit for charging the ignition energy storage capacitor C1 with the outputs of both exciter coils is employed.

In the example shown in FIG. 1, an IGBT is used as a switch element constituting the semiconductor switch 6 for lap discharge. However, the switch element may be any switch element that can be turned on and off, and may be a bipolar transistor or MOSFET. Other switch elements may be used.

[0051]

As described above, according to the present invention, when carbon adheres to the spark plug, not only can the carbon be burned off to restore the spark plug to a normal state, but also the duration of the spark discharge can be reduced. , The combustion of a lean mixture can also be performed satisfactorily, so that the probability of occurrence of an ignition mistake can be reduced, the harmful substances in the exhaust gas can be reduced, and the exhaust gas can be purified. There are advantages that can be done.

Further, according to the present invention, since a high overlapping discharge voltage is generated from the overlapping discharge generating coil only when the ignition operation is performed, an unnecessary high voltage is applied to the ignition plug during the period when the ignition operation is not performed. Can be prevented from being applied
Unnecessary sparks can be prevented from being generated in the spark plug at positions other than the regular ignition position.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration example of an internal combustion engine ignition device according to the present invention.

FIG. 2 is a waveform diagram showing a voltage waveform and a signal waveform of each part in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnet generator 3 Ignition coil 5 Ignition controller 6 Boosting semiconductor switch W1 Exciter coil W2 Overlap discharge generation coil C1 Ignition energy storage capacitor Th Thyristor (discharge switch) D1 Diode

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02P 1/08 F02P 3/00

Claims (1)

(57) [Claims] An output voltage of a magnet generator provided to rotate synchronously with an internal combustion engine, an ignition coil, and one of output voltages of an exciter coil provided on the primary side of the ignition coil and provided in the magnet generator. An ignition energy storage capacitor charged to the polarity of the ignition coil, and provided so as to conduct when an ignition signal is given, and discharge the electric charge stored in the ignition energy storage capacitor through the primary coil of the ignition coil. A discharge switch, and ignition position control means for giving an ignition signal to the discharge switch at an ignition position of the internal combustion engine, wherein the secondary coil of the ignition coil is discharged by discharging electric charges stored in the ignition energy storage capacitor. In the capacitor discharge type internal combustion engine ignition device for inducing a high voltage for ignition, the phase is advanced from the ignition position of the internal combustion engine. A lap discharge coil for generating an output voltage of one half cycle at the turning angle position is provided separately from the exciter coil in the magnet generator, and the output voltage of one half cycle of the lap discharge coil rises A boosting semiconductor switch which is controlled to be in a conductive state when turned on and is turned off at the ignition position or at a rotation angle position slightly delayed from the ignition position is connected in parallel to the lap discharge coil. A voltage obtained by superimposing a voltage induced on the power generation coil for lap discharge and the high voltage for ignition with the same polarity when the boosting semiconductor switch is turned off is output as an output voltage of the ignition device. An ignition device for an internal combustion engine, wherein the power generation coil for lap discharge and a secondary coil of an ignition coil are connected.