JP3125587B2 - Capacitor discharge type 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 capacitor discharge ignition system for an internal combustion engine.

[0002]

2. Description of the Related Art As a capacitor discharge type ignition device, an exciter coil provided in a magnet generator attached to an internal combustion engine, an ignition coil, and an output voltage of a positive half cycle of the exciter coil are charged to one polarity. An ignition energy storage capacitor, a discharge switch that conducts when an ignition signal is supplied, and discharges the charge of the ignition energy storage capacitor to the primary coil of the ignition coil; An apparatus provided with an ignition signal supply device for supplying an ignition signal to an ignition signal input terminal of a switch is often used.

[0003] This type of ignition device generates an ignition voltage even when the engine rotates in the reverse direction. Therefore, when the ignition voltage is applied to a two-cycle engine, the engine starts or the engine stops. At this time, if the engine rotates in the reverse direction due to the reaction due to the compression pressure in the cylinder, an ignition voltage may be generated and the reverse rotation of the engine may be maintained as it is.

In order to prevent this, in a capacitor discharge type ignition device used for a two-cycle engine, a reverse rotation prevention circuit for preventing an ignition signal from being supplied to a discharge switch when the engine rotates in a reverse direction. Is provided.

FIG. 6 shows a conventional capacitor discharge type ignition device provided with a reverse rotation prevention circuit.
Is an exciter coil provided in a magnet generator attached to an internal combustion engine (not shown) and one end of which is grounded,
A diode 2 having an anode facing the ground side is connected in parallel to both ends of the exciter coil 1. The non-grounded terminal of the exciter coil 1 is connected to one end of an ignition energy storage capacitor 4 through a diode 3, and the other end of the capacitor 4 is connected to one end of a primary coil 5 a of an ignition coil 5. The other end of the primary coil 5a of the ignition coil is grounded, and a thyristor 7 whose cathode is directed to the ground side is connected between one end of the capacitor 4 and the ground. The thyristor 7 constitutes a discharge switch, and a resistor 8 is connected between the gate and the cathode of the thyristor. One end of a secondary coil 5b of the ignition coil 5 is connected to a non-ground terminal of an ignition plug 6 attached to a cylinder of the engine, and the other end of the secondary coil 5b is grounded together with the other end of the primary coil 5a. .

In FIG. 6, reference numeral 11 denotes a signal coil provided in a signal generator which rotates synchronously with the engine. This signal coil is used during a period in which a positive half-cycle voltage is generated in the exciter coil 1 as shown in FIG. The negative direction signal as shown in FIG.
A signal voltage in one cycle consisting of a signal Vp1 in the direction of the dashed arrow and a positive signal (signal in the direction of the solid arrow in FIG. 6) Vp2 is output.

A diode 12 is connected to one end of the signal coil 11.
, 51 and the cathode of the diode 13 are connected in common, and the cathode of the diode 12 is connected to a waveform shaping circuit 18 comprising a parallel circuit of a resistor 16 and a capacitor 17.
Through the thyristor 7 as a discharge switch.

A diode 14 is connected to the other end of the signal coil 11.
, 52 and the cathode of the diode 15 are commonly connected, and the cathode of the diode 14 is connected to the gate of the thyristor 7 through a Zener diode 19 and a waveform shaping circuit 22 composed of a parallel circuit of a resistor 20 and a capacitor 21. I have. The anodes of the diodes 13 and 15 are grounded, and the cathodes of the diodes 51 and 52 are commonly connected to a non-ground side terminal of the exciter coil 1.

In this example, the signal coil 11, diodes 12 to 15, zener diode 19, and waveform shaping circuits 18 and 22 apply an ignition signal to the ignition signal input terminal of the discharge switch (in this example, between the gate and cathode of the thyristor 7). An ignition signal supply device 23 is provided.

The magnitude of the signal voltage generated in the signal coil 11 increases as the engine speed increases. In the ignition device shown in FIG. 6, the negative direction signal Vp1 generated by the signal coil 11 when the rotational speed of the engine exceeds the set value N1.
Is the Zener voltage V of the Zener diode 19.
The output characteristics of the signal coil 11 and the Zener voltage of the Zener diode 19 are selected so as to be equal to or larger than z.

In the above circuit, when the engine is rotating forward, when the signal coil 11 generates a signal, a voltage of a positive half cycle in the direction indicated by the solid line arrow is generated in the exciter coil 1. , Diodes 51 and 52 are applied with reverse voltages. When the rotational speed of the engine is lower than the set value N1, as shown by the solid line in FIG.
The magnitude of p1 is the Zener voltage V of the Zener diode 19.
z, so that the signal coil 1 when the next generated positive signal Vp2 reaches a predetermined threshold voltage (determined by the voltage across the capacitor 17) at the angle θ2.
1 → diode 12 → waveform shaping circuit 18 → thyristor 7
The ignition signal is given to the thyristor 7 through the path between the gate and the cathode → the diode 15 → the signal coil 11. As a result, the thyristor 7 conducts and discharges the electric charge of the capacitor 4 to the primary coil of the ignition coil 5 to induce a high voltage (ignition voltage) V2 for ignition in the secondary coil of the ignition coil. Therefore, when the rotational speed of the engine is lower than the set value N1, the ignition operation is performed at the angular position θ2.

When the rotational speed of the engine exceeds the set value N1,
As shown by the broken line in FIG. 7B, the negative direction signal Vp1 generated by the signal coil 11 increases, and the signal Vp1 changes to the angle θ.
Since the zener voltage of the zener diode 19 exceeds the zener voltage at the position 1, the signal coil 11 at the angle θ 1
→ Diode 14 → Zener diode 19 → Waveform shaping circuit 22 → Gate-cathode circuit of thyristor 7 → Ignition signal is given to thyristor 7 through the path of diode 13, and thyristor 7 conducts at the angular position θ1 to start the ignition operation. Done. Therefore, as shown in FIG. 3, the ignition position of the engine advances stepwise from θ2 to θ1 when the rotation speed reaches the set value N1.

The voltage across the ignition energy storage capacitor 4 is, for example, as shown in FIG.
The waveform Vc shown by the solid line in (C) is as shown, and the charging voltage at the time of the ignition operation is Vcm. However, when the rotation of the engine exceeds the set value N1, the charging voltage of the capacitor 4 becomes as shown in FIG.
A waveform Vc 'indicated by a broken line in (C) is obtained, and the charging voltage at the time of the ignition operation is Vcm'(<Vcm). for that reason,
If the ignition position is advanced when the rotation speed reaches the set value N1, the ignition voltage V2 generated in the secondary coil of the ignition coil decreases as shown by the curve b shown by the broken line in FIG. descend.

When the engine rotates in the reverse direction, the polarity of the AC voltage generated in the exciter coil 1 is opposite to that in the forward rotation, so that when the signal coil 11 generates a signal, A state in which the voltage of the negative half cycle in the direction is generated. Therefore, the signal coil 1
The positive signal Vp2 in the direction of the solid arrow shown in FIG.
Signal coil 11 → Diode 51 → Exciter coil 1
→ Diode 15 → Signal coil 11 is bypassed between the gate and cathode of thyristor 7 (between ignition signal input terminals). Further, the negative signal Vp1 in the direction of the dashed arrow shown in the figure generated by the signal coil 11 is bypassed between the gate and cathode of the thyristor 7 through the path of the signal coil 11, the diode 52, the exciter coil 1 and the diode 13.

As described above, when the engine is reversed, the positive and negative signals generated by the signal coil 11 are bypassed between the ignition signal input terminals of the discharge switch. No signal is supplied. Thereby, the ignition operation at the time of reverse rotation of the engine is prevented, so that reverse rotation of the engine is prevented.

In the example shown in FIG. 6, the diodes 51 and 52 and the exciter coil 1 constitute a reverse rotation prevention circuit.

[0017]

In order to prevent reverse rotation of the engine, a signal voltage generated in the signal coil at the time of reverse rotation of the engine is bypassed from the signal input terminal of the main ignition circuit through the exciter coil. In the conventional ignition device provided with the reverse rotation prevention circuit for preventing the occurrence of the ignition, it is necessary to generate the ignition signal during the period when the voltage of the positive half cycle is generated in the exciter coil during the forward rotation of the engine.

Therefore, as described above, when the rotation speed reaches the set value N1 and the ignition position is advanced, the charging voltage of the ignition energy storage capacitor at the time of the ignition operation decreases and the ignition performance decreases. was there.

An object of the present invention is to prevent the engine from rotating in the reverse direction by bypassing the ignition signal from the ignition signal supply device from the ignition signal input terminal of the discharge switch when the engine is about to rotate in the reverse direction. It is an object of the present invention to provide a capacitor discharge type ignition device for an internal combustion engine in which the charging voltage of an ignition energy storage capacitor is prevented from lowering at the time of rotation and the ignition performance is prevented from lowering.

[0020]

According to the present invention, there is provided an exciter coil provided in a magnet generator attached to an internal combustion engine and outputting an alternating voltage of a plurality of cycles per rotation of the engine in synchronization with the rotation of the engine. An ignition coil, an ignition energy storage capacitor provided on the primary side of the ignition coil and charged to one polarity with an output voltage of a positive half cycle of the exciter coil, and electrically connected to each other when an ignition signal is given; A capacitor discharge type internal combustion engine comprising: a discharge switch for discharging a charge of a capacitor to a primary coil of an ignition coil; and an ignition signal supply device for supplying an ignition signal to an ignition signal input terminal of the discharge switch at an ignition position of the internal combustion engine. The present invention relates to an ignition device for a vehicle.

According to the present invention, an ignition signal bypass switch provided to bypass an ignition signal from an ignition signal input terminal of a discharge switch when conducting, and an output voltage of a negative half cycle of an exciter coil. The ignition signal side switch is kept in the cut-off state when the ignition signal is generated, and the ignition signal side switch is kept in the conduction state when the output voltage of the positive half cycle of the exciter coil is generated. And an ignition signal side switch control circuit for controlling the ignition signal side switch according to the polarity of the output voltage of the exciter coil. In the present invention, the ignition signal supply device is configured to generate an ignition signal when the exciter coil is generating a voltage of a negative half cycle when the internal combustion engine is rotating forward.

The ignition signal bypass switch may be constituted by an NPN transistor having a collector-emitter circuit connected in parallel between ignition signal input terminals of the main ignition circuit. In this case, the ignition signal bypass switch control circuit includes a DC power supply circuit that outputs a DC voltage, a base current supply circuit that supplies a base current to the transistor from the DC power supply circuit, and an output of the exciter coil in a negative half cycle. And a reverse bias circuit that reverse-biases the base and emitter of the transistor when a voltage is being generated to turn off the transistor.

The reverse bias circuit has a diode connected between the base and the emitter of the transistor with the anode facing the emitter of the transistor, and a forward current flows through the diode at the output of the negative half cycle of the exciter coil. And a circuit.

[0024]

With the above construction, an ignition signal is generated when the exciter coil is generating a voltage of a negative half cycle during forward rotation of the engine, and the exciter coil is driven during a positive half cycle during reverse rotation of the engine. An ignition signal is generated when voltage is being generated. When the igniter coil is generating a negative half-cycle voltage, the ignition signal side switch control circuit keeps the ignition signal side switch closed so that an ignition signal is generated when the engine is running forward. Then, the ignition signal is supplied to the discharge switch, and the ignition operation is performed without any trouble.

On the other hand, when the engine rotates in reverse, the exciter coil generates a voltage of a positive half cycle when the ignition signal is generated, and the ignition signal side switch control circuit controls the ignition signal side switch. The ignition signal is bypassed from the ignition signal input terminal of the discharge switch because it is kept in the conductive state. Therefore, the ignition operation is not performed, and the engine cannot continue the reverse rotation.

In addition, when the engine is rotating forward, when the ignition signal is generated, the ignition energy storage capacitor is fully charged by the output voltage of the positive half cycle immediately before the exciter coil. Does not change the charging voltage of the ignition energy storage capacitor during the ignition operation. Accordingly, it is possible to prevent the charging voltage of the capacitor from being lowered at the time of advancing, thereby preventing the ignition performance from being lowered, and to obtain good ignition performance over the entire rotation range of the engine.

[0027]

FIG. 1 shows an embodiment of the present invention. In FIG. 1, the same parts as those of the conventional example shown in FIG. 6 are denoted by the same reference numerals. In FIG. 1, reference numeral 1 denotes an exciter coil provided in a magnet generator mounted on an internal combustion engine (not shown). The exciter coil generates an AC voltage in a plurality of cycles per one rotation of the engine in synchronization with the rotation of the internal combustion engine. In this embodiment, the magnet generator has four poles, and the exciter coil 1 induces two cycles of the AC voltage Ve per rotation as shown in FIG. The output voltage of the exciter coil 1 is applied to the ignition energy storage capacitor 4 through the diode 3, and the capacitor 4 is charged to the polarity shown by the positive half cycle output voltage of the exciter coil 1 in the direction of the solid arrow shown in the figure.

When an ignition signal is given from the ignition signal supply device 23 to the gate of the thyristor 7 serving as a discharge switch, the electric charge of the capacitor 4 is discharged to the primary coil 5a of the ignition coil 5 through the thyristor, and The other-field ignition voltage V2 is induced in the next coil 5b. Since this ignition voltage is applied to the ignition plug 6, a spark is generated in the ignition plug, and the engine is ignited.

As in the ignition device shown in FIG. 6, a signal coil 11, diodes 12 to 15, a zener diode 19, a waveform shaping circuit 18 comprising a parallel circuit of a resistor 16 and a capacitor 17, a resistor 20 and a capacitor An ignition signal supply device 23 comprising a waveform shaping circuit 22 comprising 21 parallel circuits is provided, and an output terminal of the ignition signal supply device is connected to the gate of the thyristor 7.

The signal coil 11 is provided, for example, in a signal generator disposed opposite to a reluctor formed on the outer periphery of a flywheel magnet rotor of a magnet generator provided with the exciter coil 1 and has the signal coil. As shown in FIG. 2B, when the reluctor passes through the position of the magnetic pole of the generated electron, the signal Vp1 in the negative direction (the direction of the dashed arrow in FIG. 1) and the signal Vp1 in the positive direction (FIG.
(In the direction of the dashed arrow in FIG. 2) and a signal voltage of one cycle composed of the signal Vp2. In the present embodiment, the output voltage of the exciter coil 1 is adjusted so that the signals Vp1 and Vp2 are generated during the period when the exciter coil 1 generates the voltage of the negative half cycle in the direction of the dashed arrow shown in the figure at the time of forward rotation of the engine. The phase relationship with the signal voltage is set. Further, the magnitude of the signal voltage induced in the signal coil 11 increases with an increase in the rotation speed during the period. In the present embodiment, when the rotation speed of the engine reaches the set value N1, the peak value of the negative direction signal Vp1 is reduced by the Zener. In order to reach the Zener voltage Vz of the diode 19,
The output characteristics of the signal coil 11 and the Zener voltage of the Zener diode 19 are selected.

A collector-emitter circuit of an NPN transistor 24 is connected via a diode 25 between the gate and cathode of the thyristor 7. Transistor 24
Constitutes an ignition signal bypass switch for bypassing an ignition signal from an ignition signal input terminal of a discharge switch (thyristor 7) when the transistor is turned on.

In order to control the transistor 24, a DC power supply circuit 26 for outputting a DC voltage using the exciter coil 1 as a power supply, a base current supply circuit 27 for supplying a base current from the DC power supply circuit to the transistor 24, A reverse bias circuit 28 for reversely biasing the base and the emitter of the transistor 24 to turn off the transistor when the output voltage of the negative half cycle is generated.
Is provided.

The DC power supply circuit 26 used in this embodiment includes a diode 30 having an anode connected to the non-ground side terminal of the exciter coil 1, a capacitor 32 connected between the cathode of the diode 30 and ground through a resistor 31, Zener diode 3 connected in parallel to capacitor 32
The capacitor 32 is charged to the Zener voltage of the Zener diode 33 by the output voltage of the positive half cycle of the exciter coil 1 so that a constant DC voltage can be obtained between both ends of the capacitor. ing.

The base current supply circuit 27 of the present embodiment comprises a resistor 34 connected between the output terminal of the DC power supply circuit 26 and the base of the transistor 24.

The reverse bias circuit 28 includes the transistor 24
And a diode 35 connected between the base and emitter of the transistor with the anode facing the emitter of the transistor, and the cathode between the cathode of the diode and the non-ground side terminal of the exciter coil 1 facing the exciter coil. In this embodiment, a forward current flows through the diodes 35 and 36 at the output of the negative half cycle of the exciter coil 1 in this embodiment.

Next, the operation of the above embodiment will be described with reference to FIGS. In this embodiment, the magnet generator has four poles, and an AC voltage of two cycles per rotation is generated in the exciter coil 1 as shown in FIG. When the output voltage of the positive half cycle in the direction of the solid line arrow shown in the figure is generated in the exciter coil 1, the output voltage of the positive half cycle charges the ignition energy storage capacitor 4 to the polarity shown in FIG. Is charged to the illustrated polarity, and a DC voltage obtained between both ends of the capacitor is output from the DC power supply circuit 26.

When the output voltage of the positive half cycle of the exciter coil 1 is generated, a base current is supplied from the DC power supply circuit 26 to the transistor 24 through the resistor 34, and the transistor is kept conductive. When an output voltage of the negative half cycle in the direction of the dashed arrow shown in the drawing of the exciter coil 1 is generated, a current flows through the diode 2 by the output voltage of the negative half cycle, and a forward current flows through the diodes 35 and 36. Flows, and a forward bias voltage generated in the diode 35 causes a reverse bias between the base and the emitter of the transistor 24. Thus, when the exciter coil is inducing a negative half cycle of voltage, transistor 24 is kept off.

When the forward rotation speed of the engine is lower than the set value N1, the ignition energy storage capacitor 4 is charged with the voltage of the two positive half cycles of the exciter coil 1, and the voltage across the capacitor is For example, FIG.
The waveform Vc rises as shown by the waveform Vc shown by the solid line in FIG. During the negative half cycle of the exciter coil 1, the charging voltage of the capacitor 4 is maintained at a substantially constant value Vcm.

During forward rotation of the engine, the exciter coil 1
2B, a negative direction signal Vp1 and a positive direction signal Vp2 indicated by solid lines in FIG. When the rotation speed of the engine is low, the magnitude of the negative direction signal Vp1 is
Is lower than the Zener voltage Vz, the signal Vp1 is blocked by the Zener diode 19. Next, when the forward direction signal Vp2 is generated, the signal coil 11 → the diode 12 →
An ignition signal is supplied to the thyristor 7 through the path of the waveform shaping circuit 18 → the circuit between the gate and the cathode of the thyristor 7 → the gate of the thyristor 7. At this time, since the transistor 24 is in the cut-off state, an ignition signal is given to the gate of the thyristor 7 and the thyristor is turned on at the angular position θ2 .
As a result, the capacitor 4 charged to the charging voltage Vcm
Is discharged to the primary coil 5a of the ignition coil 5 to generate an ignition voltage V2 in the secondary coil 5b.

When the rotational speed of the engine rises and exceeds the set value N1, the voltage between both ends of the ignition energy storage capacitor 4 rises, for example, as shown by a waveform Vc 'shown by a broken line in FIG. Capacitor charging voltage is almost constant value Vcm
'Is held. When the rotation speed exceeds the set value N1, the magnitudes of the negative direction signal Vp1 and the positive direction signal Vp2 generated by the signal coil 11 increase as shown by the broken lines in FIG. Higher than the zener voltage Vz of

Therefore, the signal coil 11 is driven by the negative signal.
→ Diode 14 → Zener diode 19 → Waveform shaping circuit 22 → Between gate and cathode of thyristor 7 → Diode 13 → Ignition signal is given to thyristor 7 through signal coil 11 and angular position θ1 is advanced from angular position θ2.
The thyristor 7 is turned on. As a result, the charging voltage Vcm '
Is discharged from the capacitor 4, and an ignition voltage V 2 is generated in the ignition coil 5.

As described above, in this embodiment, the exciter coil 1 induces an AC voltage of two cycles per revolution, and the ignition energy is obtained by the output voltage of the two positive half cycles of the exciter coil. Since the ignition signal is generated after the storage capacitor 4 is charged and the charged voltage is maintained at a substantially constant value, the ignition position is advanced when the rotation speed reaches the set value N1. Also, the charging voltage of the capacitor 4 during the ignition operation does not decrease, and good ignition performance can be obtained over the entire rotation range.

FIG. 4 shows a comparison between the characteristics of the embodiment of the present invention shown in FIG. 1 and the conventional example shown in FIG. 6, which shows the relationship between the ignition voltage V2 and the rotational speed N of the engine. so,
In the figure, a curve a shows the characteristic obtained by the ignition device of the present embodiment, and a curve b shows the characteristic obtained by the conventional ignition device. As is clear from FIG. 4, according to the present invention, as shown in FIG.
, The ignition voltage does not decrease even if the ignition position is advanced, and the ignition performance does not decrease. In the ignition device of the present embodiment, when the internal combustion engine rotates in the reverse direction, the polarity of the AC voltage induced in the exciter coil 1 and the polarity of the signal voltage induced in the signal coil 11 are opposite to the polarity during the forward rotation. FIG. 5A shows a waveform Ve (solid line) of the AC voltage induced in the exciter coil 1 at the time of normal rotation and a waveform Ver (dashed line) at the time of reverse rotation, and FIG. These figures show a waveform Vp (solid line) at the time of forward rotation of the signal voltage and a waveform Vpr at the time of reverse rotation. In these figures, the rotation angle position is from left to right during forward rotation, and from right to left during reverse rotation. It is shown as changing. As can be seen from the figure, at the time of reverse rotation of the engine, the signal voltage Vpr is generated during the period in which the output voltage of the positive half cycle of the exciter coil 1 is generated. Therefore, in this case, when the negative signal and the positive signal are generated, the transistor 24 is conducting, and the ignition signal supplied from the ignition signal supply device 23 to the discharge thyristor 7 is bypassed through the transistor 24. Therefore, the thyristor 7 does not conduct. Therefore, even if the engine tries to reverse, no ignition voltage is generated,
Reverse rotation of the engine is not maintained.

In the above embodiment, the ignition signal supply device 23
Is configured to supply an ignition signal based on a negative direction signal and a positive direction signal generated in the signal coil 11. When the engine speed reaches a set value N1, the ignition position is set to θ2.
From ス テ ッ プ to θ1 in a step-like manner,
The ignition signal supply device 23 only needs to generate an ignition signal within an angular range in which the exciter coil 1 generates an output voltage of a negative half cycle during the forward rotation of the engine. It is not limited to. For example, a known arithmetic circuit using an integration circuit whose integration interval is determined by a signal voltage obtained from a signal coil, which generates an ignition signal for advancing or retarding within the above-mentioned angle range, or using a CPU And an ignition signal may be generated at the ignition position.

In the above embodiment, the transistor 2
4, a DC power supply circuit 26 for supplying a base current,
Although the DC power supply circuit is configured to output a DC voltage using the exciter coil 1 as a power supply, the configuration of the DC power supply circuit is not limited to the above-described embodiment. For example, a DC power supply circuit that outputs a DC voltage using a battery or another power generation coil provided in a magnet generator attached to the engine as a power supply may be used.

[0046]

As described above, according to the present invention, the capacitor for storing ignition energy is charged with the output voltage of the positive half cycle of the exciter coil which outputs the AC voltage of a plurality of cycles per rotation of the internal combustion engine. Along with
An ignition signal bypass switch that bypasses the ignition signal from the ignition signal input terminal of the discharge switch is provided, and the ignition signal bypass switch is turned off when the exciter coil generates a negative half cycle output voltage. State, and the bypass switch is kept conductive when the exciter coil is generating a positive half-cycle output voltage, so that charging of the ignition energy storage capacitor is completed during normal rotation of the engine. After that, an ignition signal is generated to prevent a decrease in ignition performance at the time of advance. Also, when the engine rotates in the reverse direction where the polarity of the output voltage of the exciter coil is reversed, an ignition signal is generated while the ignition signal bypass switch is conducting, so that the ignition signal is bypassed from the discharge switch for ignition. The operation can be prevented from being performed, and reverse rotation of the engine can be prevented.

[Brief description of the drawings]

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

FIG. 2 is a waveform diagram showing voltage waveforms at various parts in FIG.

FIG. 3 is a diagram showing characteristics of an ignition position with respect to a rotation speed obtained according to an embodiment of the present invention.

FIG. 4 is a diagram comparing characteristics of an ignition voltage with respect to a rotation speed between an embodiment of the present invention and a conventional example.

FIG. 5 is a waveform diagram showing an output waveform of an exciter coil and an output waveform of a signal coil used in the embodiment of the present invention at the time of forward rotation and reverse rotation of the engine.

FIG. 6 is a circuit diagram showing a circuit configuration of a conventional example.

FIG. 7 is a waveform diagram showing voltage waveforms at various parts in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exciter coil 4 Ignition energy storage capacitor 5 Ignition coil 7 Thyristor (discharge switch) 11 Signal coil 23 Ignition signal supply device 24 NPN transistor (Ignition signal side path switch) 26 DC power supply circuit 27 Base current supply circuit 28 Reverse bias Circuit 29 Ignition signal side switch control circuit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-92046 (JP, A) JP-A-56-32077 (JP, A) Fully open sho 59-14970 (JP, U) Really open sho 63- 182279 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F02P 3/08 302-303 F02P 11/02 303

Claims (1)

(57) [Claims] 1. Inside a magnet generator attached to an internal combustion engine
Is installed in the engine and synchronized with the rotation of the engine.
An exciter coil that outputs several cycles of AC voltage,
An ignition coil and a primary coil provided on the primary side of the ignition coil.
The output voltage of the positive half cycle of the exciter coil
Energy storage capacitor charged to different polarities
And when the ignition signal is given, the capacitor
To discharge the electric charge of the ignition coil to the primary coil of the ignition coil
Switch for discharging at the ignition position of the internal combustion engine.
Ignition signal supply to give the ignition signal to the ignition signal input terminal
The ignition signal is transmitted to the discharge switch when the device is electrically connected to the device.
A point provided to bypass the ignition signal input terminal
A fire signal side switch and a negative switch of the exciter coil.
When a half cycle output voltage is being generated, the ignition signal
No. side switch is closed and the exciter
When the positive half cycle output voltage of the
The ignition signal side switch is turned on so that the switch is turned on.
The ignition signal according to the polarity of the output voltage of the coiler coil;
Ignition signal to control bypass switch
Circuit, and wherein the ignition signal supply device
Exciter coil has negative half cycle output voltage during rotation
Is configured to generate an ignition signal when
Igniter for a capacitor discharge internal combustion engine
The ignition signal side switch is provided between the collector and the emitter.
Path is connected in parallel between the ignition signal input terminals of the discharge switch.
The ignition signal side switch control circuit comprises an NPN transistor connected thereto, and outputs a DC voltage.
A DC power supply circuit, and the DC power supply circuit
Base current supply circuit that supplies base current to transistor
And the exciter coil has a negative half cycle output voltage
The base emitter of the transistor
Reverse bias between transistors to turn off the transistor.
A reverse bias circuit, wherein the reverse bias circuit has a base emitter of the transistor.
With the anode facing the emitter of the transistor
Diode and the exciter coil connected in an extended state
Forward current through the diode at the output of the negative half cycle of
A capacitor discharge type internal combustion engine ignition device characterized by comprising a flowing circuit .