JPS6132151Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an ignition device for an internal combustion engine whose ignition power source is an alternating current generator that generates an alternating current voltage in synchronization with the rotation of the internal combustion engine.

Generally, in internal combustion engines, it is necessary to control the ignition position according to the rotational speed. For example, in a four-stroke internal combustion engine, as shown in Figure 1, the idling speed N ₀ (rpm) changes from the set rotation speed N ₁
(rpm), ignition is performed at a substantially constant ignition position θ ₁ , and in the medium to high speed range from the set rotation speed N ₁ (rpm) to N ₂ (rpm), the ignition position θ _i is changed from θ ₁ to θ.
An advance characteristic that advances the angle θ _W (advance width) up to ₂ is required. In the figure, TDC is the top dead center of the engine piston, and BTDC is the bottom dead center. Various ignition devices have been proposed to obtain such advance angle characteristics, and one of them is one that starts charging a capacitor at a certain rotation angle position of the engine, and then starts discharging the capacitor at a reference angle position. Additionally, a device has been proposed in which the discharge current is controlled in accordance with the rotational speed and the position where the terminal voltage of the capacitor drops to a predetermined value is set as the ignition position of the engine. FIG. 2 shows the basic configuration of this type of ignition device that has been proposed in the past, in which a is a capacitor charged from a DC power supply _Vcc through a charging section control circuit b and a constant current circuit c; d and e are capacitors a
These are a constant current circuit and a discharge section control circuit for discharging. f is a voltage comparator, into which the terminal voltage of capacitor a and the reference voltage obtained from reference voltage generation circuit g are input, and when the terminal voltage of capacitor a becomes below the reference voltage, the voltage comparison is performed. A signal obtained from the device f is input to the ignition circuit h as a signal for determining the ignition position.

The ignition system shown in Fig. 2 above requires a charging section control circuit and a discharging section control circuit, and each of these control circuits is provided with a switching element, so many switching elements are required to control the charging and discharging of the capacitor. In addition, since a circuit for driving each of these switching elements is required, the entire circuit for controlling the ignition position becomes extremely complicated. In particular, when the power source is an AC magnet generator whose voltage peak value changes greatly depending on changes in rotational speed, it is difficult to stabilize the power source, making it difficult to operate each control circuit accurately, making it difficult to put into practical use. It was difficult to

An object of the present invention is to provide an ignition device for an internal combustion engine that uses an alternating current generator as a power source and can obtain predetermined advance angle characteristics with a simple configuration.

In this invention, a discharge control switch whose conduction period is determined by the output of a signal coil is provided in the capacitor discharge circuit, and a discharge blocking diode is provided in the capacitor charging circuit, so that the capacitor is charged when the discharge control switch is cut off. The structure is simplified by allowing the capacitor to discharge when the switch is conductive and comparing the terminal voltage of the capacitor with the reference voltage. The idea will be explained in detail.

Figure 3A shows an example of the basic configuration of the main parts of the present invention, in which a is a DC power supply V
This is a capacitor that is charged to one polarity from _cc through constant current circuit c and diode i. A discharge control switch k is connected in parallel to both ends of the capacitor a via an appropriate current limiting means j, and the connection point between the current limiting means j and the discharge controlling switch k is connected to the constant current circuit c and the diode i. connected to the connection point. The terminal voltage of the capacitor a is input to the conductive signal generating circuit m together with the reference voltage V _r obtained from the reference voltage generating circuit g. This conductive signal generation circuit m is equipped with at least a comparison circuit f that compares the terminal voltage of capacitor a and a reference voltage V _r , and when the terminal voltage of capacitor a becomes lower than the reference voltage, the semiconductor switch of ignition circuit h is It is designed to generate a conductive signal to be supplied to the In FIG. 3A, the ignition position control circuit 10 is comprised of parts other than the ignition circuit h.

In the configuration shown in FIG. 3A, the discharge control switch k is controlled by the output of a signal coil not shown in the figure. This signal coil outputs a signal of one cycle per rotation in synchronization with the rotation of the engine, and the discharge control switch k is held in a conductive state only during one half cycle that occurs before the output of this signal coil. Ru. The capacitor a is connected to the DC power supply V _cc during the period when the discharge control switch k is in the cut-off state.
is charged with constant current. Since the capacitor a is charged through the discharge blocking diode i, the capacitor a is not discharged when the discharge control switch k is cut off, and the capacitor a is maintained in a charged state. Next, when the discharge control switch k is closed by the output of the signal coil, the charge in the capacitor a is discharged through the current limiting means j and the discharge control switch k, and the terminal voltage of the capacitor a decreases. When the terminal voltage of the capacitor a falls below the reference voltage, a conductive signal is generated from the conductive signal generating circuit m, and the semiconductor switch of the ignition circuit h is made conductive to perform an ignition operation. The current supplied from the power supply _Vcc during the period when capacitor a is being discharged is bypassed from capacitor a by switch k, so that it does not flow to capacitor a. Therefore, the capacitor a is discharged without any problem, and the ignition position is controlled in accordance with the rotational speed of the engine, so that the advance characteristic shown in FIG. 1 is obtained. .

Next, a specific embodiment of the present invention will be described with reference to FIG. 3B. In the figure, 1 is a generator coil of a magnetic AC generator driven by an internal combustion engine (not shown), 2 is an ignition coil having a primary coil 2a and a secondary coil 2b, and a generator with four or more poles is used. used. One end of the power generating coil 1 is grounded, and the other end is connected to one end of the primary coil 2a. The other end of the primary coil 2a is connected to the anode of the thyristor 3, and the cathode of the thyristor 3 is grounded. The collector of an NPN transistor 5 is connected to the connection point between the primary coil 2a and the generator coil 1 via a diode 4, and the transistor 5
The emitter is grounded. The base of the transistor 5 is connected to the cathode of a diode 6, and the anode of the diode 6 is connected via a resistor 7 to a connection point between the primary coil 2a and the anode of the thyristor 3. The secondary coil 2b of the ignition coil is connected to the ignition plug 8 attached to the cylinder of the engine, and each part of the generator coil 1 to the ignition plug 8 creates a current interrupt type ignition system in which the transistor 5 is used as a semiconductor switch for primary current control. The basic circuit is configured.

The basic circuit of the above-mentioned ignition system is a well-known one.
A base current flows to the transistor 5 through the next coil 2a, the resistor 7, and the diode 6, and this transistor becomes conductive. As a result, a current close to a short-circuit current flows from the generator coil 1 through the collector-emitter of the transistor 5. When an ignition signal is applied to the thyristor 3 at an ignition position set at a position where this current becomes sufficiently large, the thyristor becomes conductive, lowering the base potential of the transistor 5 to approximately the ground potential. As a result, transistor 5
is cut off, and the current flowing through the generator coil 1 is cut off, so a high voltage is induced in the generator coil 1, and this voltage is further boosted by the ignition coil 2 and applied to the spark plug 8. Therefore, a spark is generated in the spark plug 8, and an ignition operation is performed. in this way,
In this ignition device, since the ignition operation is performed by conduction of the thyristor 3, the ignition position can be controlled by controlling the phase of applying the ignition signal to the thyristor 3.

In this embodiment, in order to control the ignition position according to the rotational speed of the engine, the ignition position control circuit 10
will be provided. To configure this control circuit, a resistor 11 is connected in parallel between the gate and cathode of the thyristor 3, and a signal coil 13 is connected in parallel to both ends of the resistor 11 via a diode 12. The signal coil 13 is provided either in the magnet generator in which the generator coil 1 is arranged or in a separate signal generator and induces a signal of one cycle per revolution of the engine. An NPN transistor 15 is connected to one end of the non-grounded side of the signal coil 13 via a resistor 14.
The base of the transistor 15 is connected, and the emitter of the transistor 15 is grounded. A diode 16 is connected in parallel between the base and emitter of the transistor 15 with its anode on the ground (emitter of the transistor 15) side, and the connection point between the cathode of the diode 16 and the base of the transistor 15 is connected to the anode of the thyristor 3 through a resistor 17. has been done. Further, the collector of the transistor 15 is connected to the anode of the thyristor 3 via a resistor 19. One end of a resistor 20 is connected to a connection point between the resistor 19 and the collector of the transistor 15, and the other end of the resistor 20 is connected to the gate of the thyristor 3.

One end of a first capacitor 24 is also connected to the anode of the thyristor 3 via a resistor 23, and the other end of the capacitor 24 is connected to the cathode of a diode 25 whose anode is grounded. The anode of a diode 26 is connected to the terminal of the capacitor 24 on the diode 25 side, and a capacitor 27 is connected in parallel between the cathode of the diode 26 and ground. One end of the non-grounded side of the capacitor 27 is connected to one end of the constant current circuit 29. The constant current circuit 29 is, for example, a known circuit in which the gate of a field effect transistor is coupled to the source via a resistor or directly, and a second capacitor 31 is connected via a diode 28 between the other end of the constant current circuit and ground. is connected. One end of the non-grounded side of the capacitor 31 is connected via a constant current circuit 32 and a diode 30.
Connected to the collector of the NPN transistor 33,
The emitter of transistor 33 is grounded.
The base of the transistor 33 is grounded through a resistor 34 and connected to the collector of the transistor 15 through a resistor 35, and the collector of the transistor 33 is connected to the anode of the diode 28. Further, a series circuit of a resistor 36 and a Zener diode 37 is connected between the cathode of the diode 26 and the ground, and a reference voltage V _r obtained across the Zener diode 37 is input to the positive input terminal 38a of the voltage comparator 38. There is. The voltage V _c across the capacitor 31 is input to the negative input terminal 38 b of the voltage comparator 38 , and the non-grounded output terminal 38 c of the comparator 38 is connected to the gate of the thyristor 3 . Further, the power supply terminal 38d of the voltage comparator 38 is connected to a line connected to the non-grounded terminal of the capacitor 27. Voltage comparator 3
8 is equipped with a switching element connected between the output terminal 38c and ground at the final stage, and the capacitor 3
The output terminal 38c is set to a ground potential when the terminal voltage V _c of 1 is higher than the reference voltage V _r , and the output terminal 38 c is set to a non-grounded state when the terminal voltage V _c becomes equal to or lower than the reference voltage V _r . has been done. Therefore, this voltage comparator 38 connects the gate and cathode of the thyristor 3 to ground when the terminal voltage V _c of the capacitor 31 is higher than the reference voltage V _r .
The ignition signal is prevented from being applied to the thyristor 3, and the ignition signal is allowed to be supplied to the thyristor 3 when V _c ≦V _r .

A thyristor 39 is connected in parallel to both ends of the capacitor 31 with its cathode connected to the ground, and the gate of the thyristor 39 is connected to the ground terminal via a resistor 40 and connected to the signal coil 13 via the resistor 41.
connected to the non-grounded terminal of the

In the above embodiment, the capacitor 31 corresponds to the capacitor a in FIG.
27 and the resistor 23 constitute a DC power source that charges the capacitor 31. Further, the diode 26, the resistor 36, and the Zener diode 37 constitute the reference voltage generating circuit g in FIG. 3A. Further, the constant current circuit 29 and the diode 28 constitute a charging circuit that charges the capacitor 31 with a constant current to one polarity using the output of the power supply, and the diode 28 is a discharge blocking diode shown in FIG. 3A. It corresponds to Furthermore, in this embodiment, a constant current circuit 32 is used as the current limiting means j in FIG. A discharge circuit is constructed. Also, a transistor 15, resistors 19, 20,
The terminal voltage of the capacitor 31 is compared with the reference voltage V _r by the voltage comparator 38 and the capacitor 31 is
A conduction signal generating circuit is constructed which generates a conduction signal to be applied to the thyristor 3 (hereinafter referred to as a semiconductor switch of the circuit) when the terminal voltage of the circuit becomes lower than the reference voltage _Vr . That is, the transistor 15 serves both as a switch for controlling the on/off state of the discharge control switch and as a control switch for the conduction signal generation circuit. More specifically, when the transistor 15 is in the cutoff state, the signal supplied from the generator coil 1 through the primary coil 2a and the resistors 19, 20 is allowed to be supplied to the thyristor 3, and the transistor 15
The supply of this signal is blocked when is in a conductive state. Furthermore, when transistor 15 becomes conductive, transistor 33 is cut off to allow charging of capacitor 31. Further, the transistors 15 and 33 constitute a discharge control switch circuit for controlling the discharge of the capacitor 31, and when the transistor 15 is cut off, the transistor 33 becomes conductive to discharge the capacitor 31. At the same time, the charging current for capacitor 31 is bypassed from capacitor 31 by transistor 33 . Further, the thyristor 39 and resistors 40 and 41 constitute a reset circuit for discharging the capacitor 31.

In the above ignition device, when the output terminal 38c of the voltage comparator 38 is in an ungrounded state and a signal in the direction of the solid arrow shown in the figure (hereinafter referred to as a positive direction signal) is induced in the signal coil 13, An ignition signal is supplied to the thyristor 3 through the diode 12. Further, when the output terminal 38c of the voltage comparator 38 is in an ungrounded state and the transistor 15 is in a cutoff state, an ignition signal is supplied from the generating coil 1 to the thyristor 3 through the primary coil 2a and the resistors 19 and 20. Note that the resistor 17 is for flowing base current to the transistor 15.
The resistance value of this resistor is set sufficiently large, and the resistance value of the resistor 1
7→No firing signal is supplied to the thyristor 3 through the circuit of the resistor 14 and diode 12.

In the above ignition system, if the magnet generator in which the generating coil 1 is provided is configured with four poles, two cycles of voltage are induced in the generating coil 1 per one rotation of the engine, and the voltage shown in the figure is A current I flows from the generator coil 1 through the diode 4 and the transistor 5 in each half cycle induced by the voltage in the direction of the solid arrow (hereinafter referred to as positive direction voltage). FIG. 3A shows the waveform of this current I with respect to the engine rotation angle θ. Also, the signal coil 13
As shown in FIG. 3B, while a positive voltage is induced in the generator coil 1, first a negative direction signal (signal in the direction of the dashed arrow shown in the figure) e _s is generated, and then a positive direction signal e generate _s ′. and forward direction signal e
The angle θ ₁ at which _s ' rises is matched to the ignition position below the set rotation speed N ₁ of the advance characteristic shown in Figure 1, and the angle θ ₂ at which the negative direction signal e _s rises marks the end of the advance. It is adjusted to the ignition position at rotational speed N ₂ or higher. Therefore, the negative direction signal e _s generated by the signal coil 13
The width corresponds to the advance angle width θ _w .

Now, when a negative half-cycle voltage (half cycle in the direction of the dashed arrow in the figure) is induced in the generator coil 1 at a position before the angle θ ₅ in Figure 4, the generator coil 1
The first capacitor 24 is charged to the polarity shown in the figure along the path of → diode 25 → first capacitor 24 → resistor 23 → primary coil 2a → generator coil 1.
Next, at angle θ ₅ , when a positive voltage is induced in the generator coil 1, a current I flows through the collector and emitter of the transistor 5, and at the same time, a base current flows through the primary coil 2a and the resistor 17 to the transistor 15. Therefore transistor 15
becomes conductive and transistor 33 is cut off. Since the transistor 33 is cut off, the first capacitor 2
4 is discharged to the second capacitor 31 through the diode 26, constant current circuit 29, and diode 28, thereby charging the second capacitor 31 with a constant current of the polarity shown. Therefore, the terminal voltage V _c of the second capacitor 31 increases linearly as shown in FIG. 3C. In the section of angle θ ₄ to _{θ 3} where a negative voltage is induced in the generator coil 1 , the first capacitor 24 is recharged by the negative voltage of the generator coil 1 . Further, in the interval from θ ₄ to _{θ 3} , since no base current flows through the transistors 15 and 33, the transistors 15 and 33 are in a cut-off state, preventing discharge of the capacitor 31, and only charging is performed. Next, when a positive voltage is induced in the generator coil 1 again at an angle θ ₃ , a current I flows from the generator coil 1 through the diode 4 and the transistor 5, the transistor 15 becomes conductive, and the transistor 33 is in a cut-off state. Since the transistor 33 is in the cut-off state, charging of the second capacitor 31 continues. Next, when one (negative direction) half-cycle signal e _s is generated in the signal coil 13 at an angle θ ₂ , the transistor 15 is cut off, and the transistor 33 is turned off.
conduction. Therefore, the second capacitor 31
The charging current is shunted from the capacitor 31 by the transistor 33, and charging of the capacitor 31 is stopped. At this time, constant current discharge is started, and the terminal voltage V _c of the second capacitor 31 decreases linearly as shown in FIG. 3C. When the terminal voltage V _c of this capacitor 31 is higher than the reference voltage V _r , the output terminal 38 of the voltage comparator 38
Since c is at ground potential, no firing signal is supplied to the thyristor 3 even if the transistor 15 is in the cut-off state. When the terminal voltage V _c is at an angle θ _i, the reference voltage V _r
When the voltage becomes equal to , the output terminal of the voltage comparator 38 becomes ungrounded. At this time, if the negative direction signal e _s is induced in the signal coil 13 and the transistor 15 is cut off, the signal will be transmitted to the thyristor 3 through the path of the generator coil 1 → primary coil 2a → resistor 19 → resistor 20 → the gate of thyristor 3. A firing signal is applied and the thyristor 3 becomes conductive. As a result, the transistor 5 is cut off, the current I is cut off, and the ignition operation is performed. FIG. 3D shows the output terminal 38c of the voltage comparator 38.
E shows the change in the potential of the transistor 15.
It shows the potential change of the collector of .

Here, the charging current of the second capacitor 31 is i ₁ ,
Let the discharge current be i ₂ and let C be the capacitance of this capacitor 31. Also, let the engine rotational speed be N (rpm), and let the width of θ ₂ to θ _i be α゜, β゜≡360゜−θ
When _w , the maximum value V _cp of the terminal voltage of the capacitor 31 is given by V _cp = (i ₁ /C) (1/6N) β° (1). On the other hand, when the transistor 15 is cut off and the capacitor 31 starts discharging, the terminal voltage V _c of the capacitor 31 is V _c = V _cp - (i ₂ /C) (1/6N) α゜... (2) expressed. Substituting equation (1) into equation (2), V _c (i ₁ /C) (1/6N) β゜ − (i ₂ /C) (1/6N) α゜ ...(3) (3) Determining α゜ from the formula, α゜=(i ₁ /i ₂ )β゜−(V _r C/i ₂ )6N...(4) Therefore, the voltage comparator between angle θ ₂ and _{θ 1} 3
Angle θ _i at which the output terminal 38c of No. 8 becomes ungrounded
is, θ _i = θ ₂ − α゜ = θ ₂ − (i ₁ / i ₂ ) β゜ + (V _r C / i ₂ ) 6N
...(5) As is clear from equation (5), the angle θ _i is the rotation speed N
θ _i increases as the rotational speed increases. The engine speed reaches N ₁ , θ ₁ = θ ₂ − (i ₁ / i ₂ ) β゜ + (V _r C / i ₂ ) 6N ₁
......If the relationship (6) is satisfied, the angle θ _i in equation (5) for higher rotational speeds becomes the generation interval θ ₁ of the negative direction signal e _s
~ θ ₂ , the transistor 15 is cut off at the angle θ _i , and this angle θ _i
An ignition signal is applied to the thyristor 3 to perform an ignition operation. The angle θ _i in equation (5) is the rotational speed N
Since the ignition position increases linearly as the rotational speed increases, the ignition position advances linearly as the rotational speed increases. When the number of rotations exceeds _N2 , the charging time of the capacitor 31 becomes shorter and the capacitor 31 is no longer charged to the reference voltage _Vr or higher, so the voltage comparator 3
The output terminal 38c of the thyristor 3 is always in a non-grounded state, and a negative direction signal e _s is generated at an angle θ ₂ to shut off the transistor 15, and at the same time, a firing signal is given to the thyristor 3. Therefore, at a rotation speed of N ₂ or more, the ignition position becomes θ ₂ (constant). while N ₁
At the following rotation speeds, the output terminal 38c of the voltage comparator 38 does not become ungrounded in the interval from θ ₁ to _{θ 2} where the transistor 15 is cut off. Here, at an angle θ ₁ , a positive direction signal e is sent to the signal coil 13.
When _s ' is induced, an ignition signal is applied to the thyristor 39 and the thyristor 39 becomes conductive, so that the second capacitor 31 is discharged through the thyristor 39. As a result, the output terminal 38c of the voltage comparator 38
becomes ungrounded, and an ignition signal is input from the signal coil 13 to the thyristor 3 through the diode 12. Since these operations occur instantaneously at an angle θ ₁ , the ignition position at rotation speeds below N ₁ is θ ₁
(constant).

As described above, according to the embodiment shown in FIG. 3B, it is possible to obtain the advance angle characteristics as shown in _FIG . The angular end rotation speed N ₂ can be freely selected by appropriately selecting the charging current i ₁ , the discharging current i ₂ , the reference voltage V _r and the capacitance of the capacitor 31 . Moreover, in this case, the ignition timing can be controlled with high accuracy without any need for any complicated circuit such as a detection circuit for N ₁ and N ₂ .

In this invention, the basic circuit configuration of the ignition device is as follows:
Any circuit is acceptable as long as the ignition position is determined by a semiconductor switch that is turned on by a conduction signal (firing signal in the case of a thyristor); for example, in the above embodiment, a circuit that uses another semiconductor switch such as a transistor switch in place of the thyristor 3 may be used. may also be used. Furthermore, a capacitor discharge type circuit can be used instead of the current cutoff type circuit.

FIG. 5 shows an embodiment in which the present invention is applied when a capacitor discharge type ignition circuit is used. In this embodiment, one end of the grounding side of the generating coil 1 is connected to the cathode of a diode 42 whose anode is grounded, and the non-grounding side terminal of the generating coil 1 is connected to one end of a capacitor 44. 1 of the ignition coil 2 is connected between the other end of the capacitor 44 and the ground.
A secondary coil 2a is connected, and a thyristor 3 is connected between the connection point between the generating coil 1 and the capacitor 44 and the ground, with its cathode being on the ground side. Further, a diode 45 is connected in parallel to both ends of the series circuit of the generator coil 1 and the diode 42 with the anode on the ground side, and a capacitor discharge type ignition circuit is constituted by the above-mentioned parts. In this ignition circuit, the capacitor 44 is charged to the illustrated polarity by the positive induced voltage of the generating coil 1. Next, when an ignition signal is applied to the thyristor 3 at the ignition position and the thyristor becomes conductive, the capacitor 44 is discharged through the thyristor 3 and the primary coil 2a, and a large current suddenly flows into the primary coil 2a. As a result, a high voltage is generated in the secondary coil 2b, and an ignition operation is performed.

First capacitor 24 of ignition position control circuit 10
One end is connected to one end of the ground side of the generator coil 1 via the diode 25, and the other end is connected to the ground terminal, and the negative induced voltage of the generator coil 1 causes the generator coil 1 → diode 25 → capacitor 24
It is charged through the path of → diode 45 → generator coil 1. The ignition position control circuit 10 and other configurations are the third
This is substantially the same as in the case of FIG. 3B, and the parts denoted by the same reference numerals as those shown in FIG. 3B perform exactly the same functions as described above. The operation of this ignition position control circuit is the same as that described above, so a description thereof will be omitted.

As described above, according to the present invention, there is no need to control the charging current and discharging current of the capacitor according to the rotation speed, and since the charging and discharging sections of the capacitor are controlled by one switching element, the switching The drive circuit for the element can also be simplified, and precise ignition position control can be performed without using a complicated circuit. In addition, since the control circuit is simplified, less power is required to control the ignition position, and even if the control circuit is operated using part of the output of the magnet generator that supplies ignition energy, it will not affect the ignition energy. There aren't many.
Therefore, ignition position control can be performed without reducing ignition performance.

[Brief explanation of the drawing]

Figure 1 is a diagram showing an example of the advance angle characteristics required for an engine, Figure 2 is a connection diagram showing a conventional example, and Figure 3A is an example of the basic configuration of the main parts of the present invention. FIG. 3B is a connection diagram showing a specific embodiment of the present invention, FIGS. 4A to E are signal waveform diagrams of various parts of the embodiment of FIG. 3, and FIG. It is a connection diagram showing an example of. 1... Generator coil, 2... Ignition coil, 3...
Thyristor, 4... Diode, 5... Transistor, 6... Diode, 7... Resistor, 8... Spark plug, 10... Ignition position control circuit, 11, 1
4, 17, 19, 20, 23, 34, 35, 3
6, 40, 41...Resistance, 12, 16, 25, 2
6, 28...Diode, 13...Signal coil,
15, 33... Transistor, 29, 32... Constant current circuit, 24... First capacitor, 31...
Second capacitor, 37... Zener diode, 38... Voltage comparator, 39... Thyristor,
42, 45...diode, 44...capacitor, a...capacitor, c...constant current circuit, f...
...Voltage comparator, g...Reference voltage generation circuit, i...
Discharge blocking diode, k...Discharge control switch, m...Conduction signal generation circuit.

Claims (1)

[Scope of utility model registration request] A semiconductor switch that controls the primary current of an ignition coil, a signal coil that outputs a signal of one cycle per revolution in synchronization with the rotation of the internal combustion engine, and conducts the semiconductor switch using the output of the signal coil as a control signal. and an ignition position control circuit for outputting a conduction signal for an internal combustion engine, the ignition device for an internal combustion engine performs an ignition operation by suddenly changing the primary current of the ignition coil by conduction of the semiconductor switch, the ignition position control circuit comprising: , comprising a capacitor, a charging circuit that charges the capacitor with a constant current to one polarity from a DC power source through a discharge blocking diode, and a discharge control switch that is conductive for one half cycle generated at the end of the signal coil. a discharge circuit that discharges the capacitor through the discharge control switch; a reference voltage generation circuit that generates a reference voltage lower than the maximum charging voltage of the capacitor; An ignition device for an internal combustion engine, comprising: a conductive signal generation circuit that generates the conductive signal when a terminal voltage becomes equal to or lower than the reference voltage.