JPH07247945A - Capacitor discharge type ignition device for internal combustion engine - Google Patents

Abstract

PURPOSE:To provide the reference signal to give the reference position of measurement of the ignition position without providing a signal generator. CONSTITUTION:A capacitor C1 of an ignition circuit 3 is charged by the output of the positive half cycle of an exciter coil 104, and the electric charge of the capacitor C1 is discharged through a thyristor Th1 to realize the ignition. When the level of the detected value Vb of the output voltage of the half cycle which is not charged to the capacitor C1 of the exciter coil 104 is agreed with the level of the reference voltage Vr, a transistor Tr4 is charged to generate the reference signal. The ignition position operated by a microcomputer 4 is measured from the position where the reference signal is generated, and when the operated ignition position is measured, the ignition signal is given to the thyristor Th1 to realize the ignition.

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 internal combustion engine ignition device for controlling the ignition position of an internal combustion engine using a microcomputer.

[0002]

2. Description of the Related Art Generally, a capacitor discharge type ignition device for an internal combustion engine is provided with an ignition energy storage capacitor provided on a primary side of an ignition coil, a charging circuit for charging the capacitor, and an ignition signal when supplied. And a discharge switch for discharging the electric charge of the capacitor to the primary coil of the ignition coil by discharging the electric charge of the ignition energy storage capacitor to the primary coil of the ignition coil through the discharge switch. A high voltage is induced in the secondary coil of the ignition coil to perform the ignition operation. In this type of ignition device, when the exciter coil in the magnet generator installed in the internal combustion engine is used as an ignition power source to charge the capacitor, the exciter coil generates a positive half cycle output voltage and a negative rotation angle section and a negative angle. The rotation angle section for generating the output voltage of the half cycle is set as the charging section and the non-charging section of the capacitor, respectively, and the capacitor is charged by the output voltage of the exciter coil in the charging section.

In recent years, various demands have been made on the internal combustion engine such as purification of exhaust gas, improvement of fuel consumption, reduction of noise, and improvement of output, and in order to meet these demands, a microcomputer is required. It has become necessary to precisely control the ignition position of an internal combustion engine using the.

In this specification, the "position" when referring to the ignition position, the signal generation position, etc. means the rotational angle position of the output shaft (usually the crankshaft) of the engine, and is actually expressed by the rotational angle. It

In an ignition device for an internal combustion engine in which the ignition position is controlled by using a microcomputer, a rotation speed calculation means for calculating the rotation speed of the internal combustion engine and an ignition position for calculating the ignition position with respect to the rotation speed of the internal combustion engine. The calculating means is realized by a microcomputer, and the ignition operation is performed by applying an ignition signal to the ignition circuit at the ignition position calculated by the ignition position calculating means. In order to perform such an operation, it is necessary to detect that the rotational angle position of the crankshaft coincides with the calculated ignition position at each rotation of the engine.

Therefore, in this kind of ignition device, a predetermined rotation angle position of the crankshaft of the internal combustion engine is set as a reference position, and the ignition position at each rotation speed is determined by the engine from the reference position to the ignition position at that rotation speed. Time required for rotation (this time is called ignition position measurement time)
Calculate in the form of. The microcomputer sets the ignition position measurement time calculated each time the reference position is detected in, for example, a counter (or a timer), and measures the time when the counter is set (the number of clock pulses that gives the ignition position measurement time. An ignition signal is generated when the counting is completed.

Therefore, in the ignition device for an internal combustion engine in which the ignition position is controlled by using the microcomputer, it is necessary to detect that the rotational angle position of the crankshaft of the engine coincides with a predetermined reference position. Therefore, in the conventional ignition device of this type, a signal generator (pulsar) including a rotor that rotates in synchronization with the crankshaft of the engine and a signal generator is provided.
Is provided to generate a pulse for detecting a reference position by the signal generator.

FIG. 13 shows an example of the configuration of a conventional capacitor discharge type internal combustion engine ignition device for controlling the ignition position by using a microcomputer. In FIG.
Is a magnet generator mounted on the crankshaft of an internal combustion engine,
2 is a signal generator configured by utilizing a part of the rotor of the generator 1, 3 is a capacitor discharge type ignition circuit, 4 is a microcomputer, 5 is a computer that recognizes a pulse signal generated by the signal generator 2. An external interrupt signal waveform shaping circuit that converts the converted waveform signal to the microcomputer 4 as an external interrupt signal IN1, and 6 converts a pulse signal generated by the signal generator 2 into a predetermined waveform. And an external interrupt signal IN2 to the microcomputer 4 and a minimum advance angle position signal waveform shaping circuit for applying a minimum advance angle position signal to the ignition circuit 3 at the minimum advance angle position of the engine. An inverter for inverting the minimum advance position signal output from the circuit 6, 8
Is an OR circuit composed of diodes D3 and D4, and 9 is a calculated ignition position signal (a signal generated when the calculated ignition position is detected by the microcomputer 4, the same applies hereinafter).
This is a calculation ignition position signal supply circuit for giving this signal to the OR circuit 8 when is generated.

The magneto-generator 1 includes a flywheel magnet rotor 1A in which a permanent magnet 102 is fixed to the inner circumference of a peripheral wall of a flywheel 101 formed in a cup shape to form a rotor magnetic pole, and an exciter for an iron core 103. A stator 1B configured by winding the coil 104 is provided, and the stator 1B is fixed to a stator base plate provided in a case or the like of an internal combustion engine.

A reluctor 201, which is an arc-shaped projection having a predetermined polar arc angle, is provided by projecting a part of the outer circumference of the peripheral wall portion of the flywheel 101. The reluctor and the peripheral wall of the flywheel constitute a rotor 2A of the signal generator, and the rotor and the signal generator (magnetic pickup) 2B fixed to the stator base plate constitute the signal generator 2. There is.

The signal emitting electron 2B is a well-known one having an iron core 203 around which a signal coil 202 is wound and a magnet 204 magnetically coupled to the iron core 203. The magnetic pole portion at the tip of the iron core 203 is a peripheral wall of a flywheel. It is opposed to the outer circumference of the part.

When the crankshaft of the internal combustion engine rotates and the flywheel 101 rotates accordingly, an AC voltage is induced in the exciter coil 104 in synchronization with the rotation of the crankshaft. The output of this exciter coil is used to supply ignition energy to the ignition circuit 3.

When the flywheel rotates, the magnetic flux linked to the signal coil 202 changes every time the reluctor 201 passes the position of the magnetic pole of the signal generating electron 2B. The signal coil 2 is changed by the change in the magnetic flux that occurs when the reluctor starts to face the magnetic pole of the signal-generating electron and when it ends the facing.
A pulse-shaped signal having a different polarity is induced in 02. The mounting position of the signal generator 2B is adjusted so that the generation position of the pulse generated when the reluctor 201 finishes facing the magnetic pole of the signal generator electron is adjusted to the minimum advance position of the internal combustion engine, and the reluctor 201 outputs the signal. The polar arc angle of the reluctor 201 is set so that the position where the pulse generated when starting to face the magnetic pole of the electron-emitting electron is sufficiently advanced (for example, the maximum advance position) from the minimum advance position. .

The capacitor discharge type ignition circuit 3 includes an ignition coil IG, an ignition plug P, and diodes D1 and D2.
, A capacitor C1 for storing ignition energy, a discharge thyristor Th1, and a resistor Ro are well known. In this ignition circuit, the exciter coil 104
→ diode D1 → capacitor C1 → diode D2 and ignition coil IG primary coil → exciter coil 10
The circuit of 4 constitutes a capacitor charging circuit.
In this charging circuit, a rotation angle section in which the exciter coil 104 generates a positive half cycle output voltage is a charging section, and a rotation angle section in which the exciter coil 104 generates a negative half cycle output voltage is a non-charging section. As a result, the capacitor C1 is charged to the polarity shown by the output voltage of the exciter coil in the charging section.

When the ignition signal Vi is applied to the gate of the thyristor Th1 at the ignition position, the thyristor becomes conductive and the charge of the capacitor C1 is discharged to the primary coil w1 of the ignition coil through the thyristor Th1. As a result, a high voltage is induced in the secondary coil w2 of the ignition coil, a spark is generated in the spark plug P, and the engine is ignited.

In the present specification, the positive and negative polarities of the output of the magnet generator are relative, and among the output voltages of the half cycles of different polarities generated by the generator, one half cycle of one polarity is used. If it is a positive half cycle, then other half cycles of polarity are negative half cycles. In this specification, of the two half cycles of the output generated by the exciter coil, the half cycle in which the ignition energy storage capacitor is charged is defined as the positive half cycle, and the half cycle in which the capacitor is not charged is the negative half cycle. And

The microcomputer 4 includes a CPU 4a,
Interrupt control circuit 4b, random access memory (RA
M) 4c, read only memory (ROM) 4d, counter 4e, comparator 4f, register 4g, latch circuit 4h, edge detection circuit 4i and flip-flop circuit 4j, external interrupt signal waveform shaping circuit 5 and minimum advance angle position signal. The outputs of the waveform shaping circuit 6 are input to the interrupt control circuit 4b as interrupt signals IN1 and IN2, respectively. The power supply voltage of the microcomputer is given by a DC power supply circuit (not shown) using the exciter coil 104 or another power generation coil arranged in the magnet generator 1 as a power source.

The inverter (inversion circuit) 7 comprises a PNP transistor Tr1 and resistors R1 and R2, and the emitter of the transistor Tr1 is connected to the output terminal of a DC power supply circuit (not shown). The output terminal of the minimum advance position signal waveform shaping circuit 6 is connected to the base of the transistor Tr1 through the resistor R1, and the collector of the transistor Tr1 is connected through the resistor R2 and the diode D3 of the OR circuit 8 to the gate of the discharging thyristor Th1 of the ignition circuit 3. It is connected to the.

The calculation ignition position signal supply circuit 9 includes a PNP transistor Tr2, an NPN transistor Tr3 and a resistor R.
3 to R6, the emitter of the transistor Tr2 is connected to the output terminal of the DC power supply circuit.

The microcomputer 4 has an output port A connected to the positive logic output terminal Q of the flip-flop circuit 4j, the output port A being connected to the base of the transistor Tr3 through the resistor R3, and the transistor Tr2.
Is connected to the gate of the discharging thyristor Th1 through the resistor R6 and the diode D4 of the OR circuit 8.

In the above ignition device, the signal coil 20
For example, as shown in FIG. 14A, 2 is a negative polarity signal Vsn reaching the threshold level −Vt at the maximum advance position θi2 and the threshold level + V at the minimum advance position θi1.
The positive polarity signal Vsp reaching t is generated only once per one revolution of the crankshaft. In FIG. 14, θ on the horizontal axis indicates the rotation angle of the engine.

The negative polarity signal Vsn is converted by the external interrupt signal waveform shaping circuit 5 into a signal having a waveform falling at the maximum advance position θi2 as shown in FIG. 14B, and the falling edge of this signal is the interrupt signal. Interrupt control circuit 4b as IN1
Given to. In this example, the microcomputer 4
However, the falling edge of the input voltage (negative logic signal) can be recognized as a signal.

Further, the positive polarity signal Vsp is converted by the minimum advance angle position signal waveform shaping circuit 6 into a rectangular wave signal which falls at the minimum advance angle position θi1 as shown in FIG. 14 (C). The falling edge of this signal is used as the minimum advance angle position signal, and the rising edge is used as the external interrupt signal IN2.

The interrupt signal IN is sent to the interrupt control circuit 4b.
When 2 is applied, the flip-flop circuit 4j is reset and the output of the positive logic output terminal Q becomes "0". When the interrupt signal IN1 is generated, the edge detection circuit 4i detects the fall and operates the latch circuit 4h to latch the count value of the counter 4e when the interrupt signal IN1 is generated, and at the same time, the counter 4e
To clear. The counter counts clock pulses, and the latched count value corresponds to the time required for the engine to make one revolution. The engine speed is calculated from this count value, and the calculated engine speed is stored in the RAM 4c.

A predetermined program and a map used for calculating the ignition position are stored in the ROM 4d of the microcomputer, and the ignition position calculating means realized by the program calculates the ignition position at each rotational speed. . The map stored in the ROM 4d gives a corresponding relationship between each bending point of the broken line and the rotation speed when the relationship between the rotation speed and the ignition position is represented by a line graph, and the ignition position is latched by the latch circuit 4h. It is calculated by the interpolation method using the rotation speed calculated from the counted value and the map data. The calculated ignition position data is calculated in the form of the time required for the engine to rotate from the reference position (the position where the interrupt signal IN1 is generated in this example) to the ignition position (ignition position measurement time). The data giving this ignition position is stored in the register 4g.

The comparator 4f constantly compares the count value of the counter 4e with the contents of the register 4g. When the count value of the counter 4e matches the contents of the register 4g, a set signal is sent to the set terminal S of the flip-flop circuit 4j. give.

When a set signal is given to the flip-flop circuit 4j, the output port A of the microcomputer 4 is outputted.
Signal changes from "0" to "1". As a result, a base current is applied to the transistor Tr3 and the transistor Tr3 becomes conductive, so that the transistor Tr2 becomes conductive and the discharge thyristor Th1 of the ignition circuit 3 is ignited from a power source (not shown) through the transistor Tr2 and the diode D4 of the OR circuit. The signal Vi (FIG. 14D) is provided.

That is, in this example, the position where the negative signal Vsn generated by the signal coil 202 reaches the threshold level and the interrupt signal IN1 is generated is used as a reference position, and the ignition position calculated from this reference position is measured. I'm trying to get started.

When the microcomputer is driven by the DC power supply circuit using the power generation coil in the magnet generator attached to the engine as the power source, when the engine is started,
The power supply voltage of the microcomputer 4 is not established, and the ignition position is not calculated. At this time, the signal coil 2
From 02, the ignition signal Vi is given to the ignition circuit through the minimum advance position signal waveform shaping circuit 6, the inverter circuit 7 and the diode D3 of the OR circuit. Therefore, the engine can be started without any trouble.

In the above description, the number of revolutions is calculated from the time required for one revolution of the engine, and the ignition position is calculated using the calculated number of revolutions and the map data. However, one revolution of the engine is required. In some cases, a map is created using the time itself as data on the number of revolutions, and the ignition position is calculated using the time required for one revolution of the engine and the data on the map.

[0031]

As described above, in the conventional ignition device, the signal generator (pulsar) 2 including the rotor that rotates in synchronization with the crankshaft and the signal generator is provided, and the reference is provided. A pulse for detecting the position was generated. Therefore, it is necessary to attach a signal generator to the engine, which inevitably increases the cost. In particular, as shown in the above example, when the signal generator 2 was provided on the outer peripheral side of the flywheel, it was unavoidable that the outer diameter dimension of the magnet generator increased.

Instead of constructing the signal generator as described above, a reluctor may be provided at the boss portion of the flywheel so that the signal generators arranged inside the flywheel face the reluctor. In this case, a noise signal may be induced by the magnetic flux generated from the magnetic field of the flywheel magnet rotor, and this noise signal may cause a malfunction. Further, as shown in the above example, when a capacitor discharge type circuit that requires an exciter coil for inducing a high voltage is used as the ignition circuit, the exciter coil 104 becomes large, so that the flywheel It becomes difficult to secure a space for arranging signal generating electrons inside.

When the flywheel magnet generator is a rotor inversion type in which the magnet rotor rotates inside the stator, the reluctor of the signal generator is considerably separated from the magnet of the magnet rotor. It was troublesome because it was necessary to install it in a different place, or to install it on a shaft different from the crankshaft.

An object of the present invention is to provide a capacitor discharge type internal combustion engine in which a signal generator can be omitted by detecting a reference position by utilizing an output of a magnet generator attached to the internal combustion engine. It is to provide an ignition device.

[0035]

The present invention has an exciter coil for charging at least a capacitor on the stator side,
A magneto generator that induces an AC voltage in synchronization with the rotation of the internal combustion engine, an ignition energy storage capacitor that is provided on the primary side of the ignition coil, and a rotation angle at which the exciter coil generates a positive half-cycle output voltage. A charging circuit for charging the capacitor by the output voltage of the exciter coil in the charging section and a non-charging section of the rotation angle section for generating the output voltage of the section and the negative half cycle, respectively, and an ignition signal are given. A discharge switch that conducts to discharge the electric charge of the capacitor to the primary coil of the ignition coil, a reference signal generation circuit that generates a reference signal at a reference position to start measuring the ignition position of the internal combustion engine, and the internal combustion engine Position calculation means for calculating the ignition position at each rotational speed of the engine, and ignition position calculation means when a reference signal is generated. An arithmetic ignition position signal generating means for generating an operation ignition position signal when completing the measurement of the ignition position to start the measurement of more arithmetically operated ignition position,
The present invention relates to a capacitor discharge type internal combustion engine ignition device for providing an ignition signal to a discharge switch when a calculated ignition position signal is generated.

In the present invention, the reference signal generating circuit matches the threshold level at which the level of the output voltage of the magneto-generator in the non-charging section changes with the change of the output voltage and the output frequency. It consists of a circuit that outputs a reference signal by detecting that, so that the position where the reference signal is generated is constant regardless of the peak value and frequency of the output voltage of the magneto generator in the non-charging section,
The rate of change of the threshold level is adjusted.

The reference signal generating circuit includes a reference voltage generating circuit for generating a reference voltage whose level changes in accordance with a change in the output voltage and output frequency of the magneto generator in the non-charging section, and a magnet generator in the non-charging section. And a reference signal output circuit that outputs a reference signal when the level of the output voltage of the voltage detection circuit matches the level of the reference voltage. In this case, the change rate of the level of the reference voltage is adjusted so that the position where the reference signal is generated is constant regardless of the peak value and the frequency of the output voltage of the magneto generator in the non-charge section.

The reference voltage generating circuit can be composed of, for example, a capacitor charged by the output voltage of the magneto generator in the non-charging section and a discharging resistor connected in parallel to the capacitor.

Further, in the reference signal output circuit, the output voltage level of the voltage detection circuit becomes equal to the reference voltage level in the process in which the output voltage level of the magneto generator in the non-charge section rises toward the peak value. It can be configured by a circuit including a reference signal generating switch that operates when they match.
In this case, the change in the voltage across the reference signal generating switch when it operates is used as the reference signal.

The reference signal output circuit also has a reference level that takes different states when the level of the output voltage of the magneto generator in the non-charging section is below the level of the reference voltage and when it exceeds the level of the reference voltage. A detection switch and a reference level detection device when the output voltage level of the voltage detection circuit becomes less than or equal to the reference voltage level in the process of the output voltage level of the magneto generator in the non-charging section passing the peak and decreasing. It can be configured by a level change detection circuit that detects a change in the voltage level across the switch and outputs a reference signal.

In the above ignition device, in the charging section in which the ignition energy storage capacitor is charged with the positive half cycle output voltage of the exciter coil, the charging current flowing through the ignition energy storage capacitor causes a large armature in the magnet generator. A reaction occurs. Therefore, the peak position of the output voltage of the magneto generator in the charging section moves due to this armature reaction. Along with this, the boundary position between the trailing edge of the output voltage of the half cycle in the charging section and the trailing edge of the output voltage of the half cycle in the non-charging section also moves. Thus, in the charging section of the magnet generator,
Since the waveform of the output voltage changes according to the change in the output of the magneto generator with the change in the engine speed, it is necessary to detect a certain reference position by using the output voltage of the magneto generator in the charging section. It is difficult.

On the other hand, in the non-charge section in which the ignition energy storage capacitor is not charged, the armature reaction due to the charging current of the ignition energy storage capacitor does not occur, so that the output voltage of the magneto generator in the non-charge section is not generated. The waveform of is in agreement with the waveform when there is no load near the peak where the influence of the armature reaction in the charging section disappears. Therefore, the waveform near the peak of the output voltage of the magneto generator in the non-charging section has a fixed relationship with the rotational angle position of the engine.

Therefore, as in the present invention, a reference voltage generating circuit for generating a reference voltage whose level changes in accordance with changes in the output voltage and output frequency of the magnet generator in the non-charge section, and the magnet power generation in the non-charge section. A voltage detection circuit that detects the output voltage of the machine and a reference signal output circuit that outputs a reference signal when the output voltage level of the voltage detection circuit matches the reference voltage level. By adjusting the rate of change to an appropriate value, it is possible to obtain a reference signal whose generation position is almost constant, regardless of the peak value and frequency of the output voltage of the magneto generator in the non-charging section. Can be omitted.

In the present invention, the position where the reference signal is generated is an appropriate position as the reference position for starting the measurement of the ignition position (the maximum advance position or a position advanced from the maximum advance position).
Of course, it is necessary to set the positional relationship between the rotor and the stator of the magneto generator so that

In the above arrangement, the ignition position during steady operation is determined by the calculated ignition position signal, and this calculated ignition position signal is generated using a microcomputer. When the microcomputer is driven by the output of the DC power supply circuit that rectifies the output of the magneto-generator to obtain a DC voltage, the microcomputer does not operate until the output of the power supply circuit is established at the time of starting the engine. If the ignition signal is provided only when the ignition position signal is generated, the starting rotation speed of the engine becomes high, which may deteriorate the startability of the engine. When the microcomputer fails and cannot calculate the ignition position, the ignition operation is stopped and the engine cannot be operated. In particular, in the case of an outboard motor, it is dangerous because it cannot return to the port when the ignition operation is stopped.

In order to improve the starting performance of the engine and to make it possible to perform the ignition operation even when the microcomputer fails, an OR circuit which receives the above-mentioned calculated ignition position signal and the reference signal as inputs. A mask switch provided so as to bypass the reference signal from the OR circuit when conducting, and a mask switch that triggers the mask switch to conduct in a region where the rotation speed of the internal combustion engine is equal to or higher than a set value. It is preferable that a trigger means is further provided so that the output of the OR circuit is given to the discharge switch as an ignition signal.

With this configuration, since the ignition signal is given to the discharge switch when the reference signal detection circuit generates the reference signal, the ignition operation is performed even when the engine is in the low rotation speed where the microcomputer cannot start the operation. The engine startability can be improved. Further, even if the microcomputer fails, the ignition signal can be given by the reference signal, so that the operation of the engine can be continued.

As described above, if the ignition signal is given at the position where the reference signal is generated when the engine is running at a low speed, the ignition position at the start of the engine will be at an advanced position. (The phenomenon that the cylinder of the engine is pushed back because the engine speed is too fast) may occur. In order to prevent this, it is preferable to delay the ignition position at the time of low rotation relative to the position where the reference signal is generated.

For that purpose, the reference signal is generated when the output voltage level of the voltage detection circuit coincides with the reference voltage level in the process in which the output voltage of the magneto generator in the non-charging section rises toward the peak. In addition, the peak detection circuit that detects the peak position of the output voltage of the magneto generator in the non-charge section and outputs the peak detection signal, and the OR circuit that receives the calculated ignition position signal and the peak detection signal are conducted. In this case, a mask switch provided to bypass the peak detection signal from the OR circuit, and a mask switch trigger that triggers the mask switch to conduct when the engine speed is above the set value It is preferable to further provide means for providing the output of the OR circuit as an ignition signal to the discharge switch.

In this case, it is preferable that the peak position of the output voltage of the magneto-generator in the non-charging section is set to a position that does not cause ketching when the ignition operation is performed at that position when the engine is started. Further, the peak position is preferably a position where the engine can be operated with the ignition operation fixed at that position.

With this configuration, when the microcomputer cannot calculate the ignition position, the ignition signal can be given at a position delayed from the reference position (the peak position of the output voltage in the non-charge section). Therefore, it is possible to prevent the occurrence of ketchin when the engine is started.

The peak detection circuit includes, for example, a peak detection capacitor, a first peak detection transistor which is turned on by a negative half cycle output of the exciter coil and which is supplied with a base current through the peak detection capacitor. The second peak output transistor holds the cutoff state when the first peak detection transistor is in the conductive state, and becomes the conductive state when the first peak detection transistor is in the cutoff state to output the fixed ignition position signal. It can be composed of a peak detecting transistor.

In the present invention, a reference voltage generating circuit for generating a reference voltage whose level changes with changes in the output voltage and output frequency of the magneto generator in the non-charging section, and the magneto generator in the non-charging section. When the output voltage level of the voltage detection circuit that detects the output voltage and the output voltage level of the voltage detection circuit matches the reference voltage level in the process of the output voltage level of the magneto-generator rising toward the peak value in the non-charging section Generates a reference signal and generates a fixed ignition position signal when the output voltage level of the magneto-generator in the non-charging section matches the reference voltage level in the process of passing the peak and falling. The position signal generation circuit, the calculated ignition position signal and the fixed ignition position signal are input, and the discharge switch is ignited when either of the ignition position signals is input. It may be provided with an OR circuit for providing a degree. Also in this case, the rate of change of the reference voltage level is adjusted so that the position where the reference signal is generated is constant regardless of the peak value and frequency of the output voltage of the magneto generator in the non-charging section. Of course.

Even with this configuration, when the microcomputer cannot calculate the ignition position, the ignition signal can be given at the fixed ignition position that is retarded from the reference position, so that the engine is started. Occasionally, ketchin can be prevented. In the ignition device according to the present invention, a thyristor is usually used as the discharge switch, but other switches such as a transistor and an FET may be used in some cases.

Generally, the "minimum advance angle position" is determined to be a substantially constant position if the internal combustion engine is determined, but the "maximum advance angle position" is changed depending on the required engine characteristics and engine use. When the ignition position is controlled by the microcomputer, the "maximum advance position" can be appropriately changed by software.

[0056]

As described above, a reference voltage generating circuit for generating a reference voltage whose level changes in accordance with a change in output voltage and output frequency of a magneto generator in a non-charging section in which an ignition energy storage capacitor is not charged A voltage detection circuit for detecting the output voltage of the magneto generator in the non-charging section, and a reference signal output circuit for outputting a reference signal when the level of the output voltage of the voltage detection circuit matches the level of the reference voltage. By adjusting the rate of change of the reference voltage level so that the position where the reference signal is generated is constant regardless of the peak value and frequency of the output voltage of the magneto generator in the non-charging section, Since the reference position can be detected by using the output waveform of the machine, the signal generator can be omitted and the structure of the magnet generator can be simplified, resulting in a compact device and low cost. It is possible to achieve the door.

Further, as described above, when the reference signal and the calculated ignition position signal are given to the discharge switch through the OR circuit, the ignition operation can be performed even when the microcomputer cannot operate. .

Further, when the output voltage level of the magneto generator in the non-charging section rises toward the peak, the reference signal is generated when the output voltage level of the voltage detection circuit matches the reference voltage level. Then, when the output of the magneto-generator reaches a peak, an ignition signal is given to the discharge switch, or the output voltage level of the magneto-generator in the non-charging section rises toward the peak. A reference signal is generated when the level of the output voltage of the voltage detection circuit matches the level of the reference voltage in the course of the process, and the reference voltage When the ignition signal is given to the discharge switch when the level matches, the ignition operation can be performed when the microcomputer cannot operate. Only Not, since it is possible to retard the ignition position in a state where the microcomputer can not operate, it is possible to prevent the kickback phenomenon occurs at the time of starting of the engine.

[0059]

In the present invention, the magnitude of the output voltage of the magneto generator in the non-charging section in which the ignition energy storage capacitor is not charged changes according to the output voltage and the output frequency of the magneto generator. A reference signal generation circuit is configured by a circuit that outputs a reference signal when it detects that the threshold level is matched, and starts measurement of the ignition position calculated from the position where the reference signal is obtained from this circuit. It is based on. Here, the rate of change of the threshold level is adjusted so that the position where the reference signal is generated is constant regardless of the output voltage and output frequency of the magneto generator. By using such a reference signal generating circuit, the signal generator can be omitted and the mechanical structure of the ignition device can be simplified. Hereinafter, the present invention will be described in detail with reference to specific examples.

Embodiment of FIG. 1 FIG. 1 shows an embodiment in which the present invention is applied to an ignition device of the type shown in FIG. 13, in which parts of the conventional ignition device shown in FIG. The same parts are denoted by the same reference numerals.

In the embodiment shown in FIG. 1, a two-pole inward-rotating magnet rotor 1A having two magnetic poles N and S formed at 180 ° intervals on the outer periphery is opposed to the magnetic pole of the magnet rotor 1A. The magnet generator 1 is composed of a stator 1B formed by winding an exciter coil 104 around an iron core 103 having magnetic pole portions 103a and 103b at both ends. The magnet rotor 1A is attached to the output shaft of an internal combustion engine (not shown), and an alternating voltage of one cycle per one rotation is induced in the exciter coil 104 in synchronization with the rotation of the engine.

One end of the exciter coil 104 is connected to the anode of the diode D1 of the ignition circuit 3, and a voltage dividing circuit consisting of a series circuit of resistors R11 and R12 is connected between the other end of the exciter coil 104 and the ground. Between one end of the exciter coil 104 and the ground, and between the exciter coil 104
Diodes D5 and D6 whose anodes are directed to the ground side are connected between the other end of the diode and the ground.

The DC power supply circuit 10 is also connected between one end of the exciter coil 104 and the ground through a resistor R10. This power supply circuit includes a diode D7 having an anode connected to one end of an exciter coil 104 through a resistor R10, a power supply capacitor C2 connected between the cathode of the diode D7 and the ground, and a zener diode ZD connected to both ends of the capacitor C2. It consists of Power supply capacitor C2 is charged through resistor R10 and diode D7 when exciter coil 104 induces a positive half cycle output voltage in the direction of the solid arrow shown. The voltage across capacitor C2 is limited by the Zener voltage of Zener diode ZD. The DC voltage E obtained across the capacitor C2 is used as the DC power supply voltage for each part. The resistance value of the resistor R10 is set sufficiently large so that the current flowing from the exciter coil 104 to the power supply circuit 10 is limited to a value that does not hinder the charging of the ignition energy storage capacitor.

The anode of the diode D8 is connected to the connection point (output terminal of the voltage dividing circuit) of the resistors R11 and R12 which form the voltage dividing circuit, and the capacitor C3 and the discharging resistor R13 are connected in parallel to the cathode of the diode D8. One end of a reference voltage generation circuit 11 composed of a circuit is connected. The other end of the reference voltage generating circuit 11 is connected to the base of an NPN transistor Tr4 whose emitter is grounded through a resistor R14, and a resistor R15 is connected between the base and emitter of the transistor Tr4.

In this example, the voltage detecting circuit 20 for detecting the output voltage of the magneto generator in the non-charging section is constituted by the voltage dividing circuit composed of the resistors R11 and R12 and the diodes D5 and D8. Also, the transistor Tr4 and the resistor R
The reference signal generating switch is constituted by 14 and R15, and the reference signal output circuit 12 is constituted by the reference signal generating switch. Further, the voltage detection circuit 20
And the reference voltage generation circuit 11 and the reference signal output circuit 12 form a reference signal generation circuit 13. The reference signal Vd obtained from this reference signal generation circuit is given to the microcomputer 4 as an interrupt signal IN, and
A fixed ignition position signal (an ignition position signal that is always generated at a constant rotational angle position regardless of calculation) is input to an OR circuit 8 through an inverter (inversion circuit) 7 including a transistor Tr1 and resistors R1a, R1b and R2. There is.

The emitter of the transistor Tr1 of the inverter 7 is connected to the output terminal of the power supply circuit 10, and when the transistor Tr4 of the reference signal generating circuit becomes conductive, the transistor Tr1 becomes conductive and the OR circuit 8 passes from the power supply circuit 10 through the transistor Tr1. A fixed ignition position signal is provided to the anode of the diode D3 of.

The anode of the diode D3 of the OR circuit has an NPN transistor T which constitutes a mask switch.
The collector of r5 is connected, and the emitter of the transistor Tr5 is grounded. The base of the transistor Tr5 is connected to a predetermined output port of the microcomputer 4 through the resistor R16. In this embodiment, the fixed ignition position signal mask circuit 14 is constituted by the transistor Tr5 and the resistor R16 which constitute the mask switch.

In this embodiment, a capacitor C4 is inserted between the resistor R3 of the operation ignition position signal supply circuit 9 provided between the output port A of the microcomputer 4 and the OR circuit 8 and the base of the transistor Tr3. A diode D10 having an anode directed to the ground side is connected between the base of the transistor Tr3 and the ground. Capacitor C
4 functions as a differentiating element and makes the calculated ignition position signal supplied to the ignition circuit 3 through the transistor Tr2 into a pulse waveform.

The structure of the microcomputer 4 is the same as that of the example shown in FIG. 13, and includes a CPU 4a, an interrupt control circuit 4b, a random access memory (RAM) 4c, a read only memory (ROM) 4d, a counter 4e, a comparator 4f and a register. 4g, a latch circuit 4h, an edge detection circuit 4i, and a flip-flop circuit 4j. The microcomputer 4 operates by being supplied with a power supply voltage by the power supply circuit 10. In this way, when the microcomputer is driven by the power supply circuit using the magnet generator as the power supply, the ignition device of the internal combustion engine used in a vehicle without a battery can be precisely controlled using the microcomputer.

In the above embodiment, when the crankshaft of the engine rotates, the exciter coil 104 generates a positive half cycle output voltage in the direction of the solid line arrow in the charging section, and in the direction of the broken arrow in the drawing in the non-charging section. Generates a negative half cycle output voltage of. Exciter coil 1
When 04 produces a positive half cycle output voltage, the ignition energy storage capacitor C1 is charged through the diodes D1 and D2.

In the embodiment of FIG. 1, the waveform of the voltage Va between the anode of the diode D1 and the ground at no load is shown with respect to the rotation angle θ as shown in FIG. 9 (A). The waveform of the voltage Vg across the capacitor C1 is as shown in FIG.

When the ignition signal Vi is applied to the gate of the discharging thyristor Th1 after the capacitor C1 is charged, the thyristor Th1 becomes conductive and the capacitor C1 is discharged to the primary coil of the ignition coil IG to perform the ignition operation. Let

When the exciter coil 104 generates a negative half-cycle output voltage in the non-charging section where the capacitor C1 is not charged, the voltage dividing point of the voltage dividing circuit composed of the resistors R11 and R12 is shown in FIG. 9 (B). Output voltage Vb as shown
Is obtained. This voltage Vb is given to the reference voltage generating circuit 11 through the diode D8 as the output voltage of the voltage detecting circuit 20 which detects the output voltage of the magneto generator in the non-charging section, and the capacitor C3 of the reference voltage generating circuit 11 is supplied by the voltage Vb. Be charged. The electric charge of the capacitor C3 is discharged through the resistor R13 with a constant time constant. Capacitor C
The level of the voltage across 3 increases as the output frequency of the magneto generator increases (as the engine speed increases), and as the output voltage of the magneto generator increases. In this embodiment, the voltage across the capacitor C3 is used as the reference voltage Vr. The change rate of the reference voltage Vr can be appropriately adjusted by the resistance value of the resistor R13 and the electrostatic capacitance of the capacitor C3.

A state in which the detected value Vb of the output voltage of the magneto generator in the non-charging section (in this example, the output voltage of the negative half cycle of the exciter coil 104) is less than or equal to the reference voltage Vr obtained across the capacitor C3. Then, since the base current cannot flow in the transistor Tr4 and the transistor Tr4 is in the cutoff state, the transistor Tr4
The collector potential of is maintained at a high level. When the output voltage Vb of the voltage detection circuit coincides with the voltage (reference voltage) Vr across the capacitor C3 at the position of the angle θs1 while the output voltage of the negative half cycle of the exciter coil rises toward the peak value. , A base current flows through the transistor Tr4 and the transistor Tr4 becomes conductive, so that the potential of the collector of the transistor Tr4 changes from a high level to a low level (approximately the ground potential level). Further, when the voltage Vb coincides with the reference voltage Vr at the position of the angle θs2 while the level of the output voltage of the negative half cycle of the exciter coil falls below the peak value, the transistor Tr4 is turned off. Therefore, the potential of the collector of the transistor Tr4 changes as shown in FIG. 9D with respect to the rotation angle θ.

Strictly speaking, when the voltage Vb exceeds the reference voltage Vr, the transistor Tr4 actually conducts in the process of increasing the voltage Vb. However, in the transistor Tr4, the voltage Vb is the reference voltage. Since the transistor Tr4 conducts even if it slightly exceeds Vf, the position where the transistor Tr4 conducts can be regarded as the position where the voltage Vb matches the reference voltage Vf. Similarly, the position where the transistor Tr4 is cut off when the voltage Vb falls from the peak can be regarded as the position where the voltage Vb matches the reference voltage Vf.

By appropriately adjusting the resistance value of the resistor R13 of the reference voltage generating circuit 11 and the electrostatic capacitance of the capacitor C3, the change of the reference voltage Vr with respect to the change of the negative half cycle output voltage of the exciter coil and the output frequency. If the ratio is adjusted to an appropriate value, the level of the output voltage Vb of the voltage detection circuit becomes the level of the reference voltage Vr while the level of the output voltage of the negative half cycle of the exciter coil rises toward the peak value. The position θs1 corresponding to can be made almost constant,
Further, the position .theta.s2 at which the level of the voltage Vb coincides with the level of the reference voltage Vr can be made substantially constant while the level of the output voltage of the negative half cycle of the exciter coil goes past the peak and drops.

In the present invention, the reference voltage Vr is set so that the position (θs1 or θs2) at which the detected value Vb of the output voltage of the magneto generator in the non-charge section matches the level of the reference voltage Vr is constant. The rate of change of is adjusted and these constant positions θs1 or θs2 are used as reference positions. Although any of these positions may be used as the reference position, in the present embodiment, the position θs1 at which the level of the output voltage in the negative half cycle of the exciter coil matches the level of the reference voltage in the process of increasing toward the peak value. Is used as a reference position.

Since the microcomputer used in this embodiment is configured to recognize the decrease in the potential of the input port (negative logic signal) as a signal, in this embodiment, the transistor Tr4 generated at the reference position θs1 is detected. The decrease in the potential of the collector is directly input to the interrupt control circuit 4b and the edge detection circuit 4i of the microcomputer as the external interrupt signal IN.

In this embodiment, the sensitivity of the transistor Tr4 is sufficiently high so that the reference signal generating circuit can operate at a power supply voltage sufficiently lower than the power supply voltage required to drive the microcomputer. I am using one.

The interrupt signal IN is sent to the interrupt control circuit 4b.
Is given, the flip-flop circuit 4j is reset and the output of the positive logic output terminal Q becomes "0",
The potential of the output port A of the microcomputer becomes "0". When the interrupt signal IN is generated, the edge detection circuit 4i detects the falling edge and operates the latch circuit 4h. The latch circuit 4h uses the interrupt signal I
The count value of the counter 4e when N is generated is latched. The interrupt control circuit 4b latches the count value of the counter 4e by the latch circuit 4h, and
Clear e. Since the counter is cleared immediately after the count value of the counter 4e is latched, the latched count value corresponds to the time required for the engine to make one revolution. The count value itself or the rotation speed calculated from the count value is used as data indicating the rotation speed Ne of the engine.

A predetermined program and a map used for calculating the ignition position are stored in the ROM 4d of the microcomputer, and the main routine shown in FIG. 10 and the interrupt routine shown in FIG. 11 are executed by the program.

In the main routine shown in FIG. 10, a process of first initializing each part when power is established, then calculating the ignition position θig at each rotation speed Ne, and storing the calculated ignition position θig in the register repeat. The calculation of the ignition position is performed by the interpolation method using the map stored in the ROM. The ignition position calculation means is realized by the process of calculating the ignition position.

The interrupt signal IN is sent to the interrupt control circuit 4b.
11 is performed, the engine speed Ne is calculated from the count value of the counter latched by the latch circuit 4h (the time required for the engine to make one revolution). The calculated rotation speed Ne is RAM4
It is stored in c and then returns to the main routine. RA
The rotation speed Ne stored in M is used to calculate the ignition position.

The comparator 4f is always the counter 4e.
Count value (elapsed time from the time when the reference position was detected)
And the contents of the register 4g are compared, and the ignition position θig
When the count value of the counter coincides with the content of the register, the comparator 4f gives a set signal to the set terminal S of the flip-flop circuit 4j.

When the set signal is applied to the flip-flop circuit 4j, the signal Ve at the output port A of the microcomputer 4 changes from "0" to "1" as shown in FIG. 9 (E). As a result, a base current is applied to the transistor Tr3 for a short time through the resistor R3 and the capacitor C4, and the transistor Tr3 is instantaneously turned on, so that the transistor Tr2 is turned on and, as shown in FIG. A pulsed operation ignition position signal Vf is applied from the power supply circuit 10 to the OR circuit 8 through the transistor Tr2. Therefore, the ignition signal Vi is given to the discharging thyristor Th1 of the ignition circuit 3 at the ignition position θig, and the ignition operation is performed.

While the rotational speed of the engine is low and the output voltage of the power supply circuit 10 is not established, the microcomputer 4 does not operate and the calculated ignition position signal is not generated. In this state,
When the transistor Tr4 (reference signal generating switch) of the reference signal generating circuit 13 is conducted (the reference signal is generated) and the transistor Tr1 of the inverter 7 is conducted, a fixed ignition position signal is given to the OR circuit 8. An ignition signal Vi is applied to the discharging thyristor Th1 through the OR circuit 8. Therefore, when the engine is in a low rotation speed where the microcomputer cannot operate, the ignition operation is performed at the position where the reference signal is generated.

In the present embodiment, during the program for operating the microcomputer, the mask switch trigger for triggering the transistor Tr5 constituting the mask switch to conduct when the rotational speed of the internal combustion engine exceeds a set value. A program for realizing the means is included. The set value of the rotation speed of the internal combustion engine is, for example, 2000
Set to [rpm]. When the engine speed is equal to or higher than the set value, the mask switch is configured. The transistor Tr5 is turned on to bypass the fixed ignition position signal provided from the reference signal generation circuit 13 to the OR circuit 8 and prevent the fixed ignition position signal from providing the ignition signal. Therefore, when the engine speed is equal to or higher than the set value, the ignition signal is given at the ignition position calculated by the microcomputer. Even if the engine speed is less than the set value, if the generation position of the calculation ignition position signal is ahead of the generation position of the fixed ignition position signal (reference signal in this embodiment), the calculation ignition is calculated. The ignition operation is performed at the position where the position signal is generated. Further, when the microcomputer 4 is damaged and becomes inoperable, the fixed ignition position signal mask circuit 14 does not work. Therefore, even if the engine speed exceeds the set value, the ignition circuit is generated at the reference signal generation position. An ignition signal is provided to 3. Therefore, the engine can be operated even when the microcomputer is out of order.

In this embodiment, since the capacitor C4 is inserted in the base circuit of the transistor Tr3 of the operational ignition position signal supply circuit 9 to form the differentiating circuit, the output of the flip-flop circuit 4j is set to "1". When
Only a pulsed signal is given to the OR circuit 8. Therefore, the flip-flop circuit 4j may be reset at an arbitrary position until the next reference signal is generated. In this embodiment, the flip-flop circuit 4j is reset by the external interrupt signal IN, but the flip-flop circuit 4j may be reset by software at an appropriate position.

Detecting the boundary position between the positive half-cycle output falling edge and the negative half-cycle output rising edge of the exciter coil in order to obtain the reference signal using the output voltage waveform of the magneto generator. However, in the case of such a configuration, the reference position cannot be made constant as shown below.

FIG. 7A shows the waveform of the magnetic flux φ interlinking the exciter coil 104 with respect to the rotation angle θ. The waveform of the no-load voltage induced in the exciter coil 104 by this change in the magnetic flux is the same. The solid line in FIG. When the ignition energy storage capacitor is charged in 104 positive half cycles of the exciter coil, an armature reaction occurs due to the charging current, so the waveform of the output voltage of the exciter coil is as shown by the broken line in FIG. 7 (B). Therefore, the peak and the boundary position between the falling edge of the positive half cycle and the rising edge of the negative half cycle are delayed. As the output voltage of the exciter coil increases as the rotation speed increases, and the charging current of the ignition energy storage capacitor increases, the armature reaction increases, so the positive half cycle of the exciter coil increases. The delay in the boundary position between the output voltage peak and the positive half-cycle falling edge and the negative half-cycle rising edge increases as the rotational speed increases. Therefore, the peak position of the output of the positive half cycle of the exciter coil or the boundary position between the falling edge of the positive half cycle and the rising edge of the negative half cycle cannot be used as the reference position.

It is also conceivable that the position where the output voltage of the positive half cycle of the exciter coil 104 reaches a predetermined threshold level is set as the reference position, but the output voltage of the positive half cycle of the exciter coil rises. Since the armature reaction is delayed with an increase in reaction, the reference position cannot be fixed even in the case of such a configuration. Curve A in FIG. 8 shows the change in the reference position with respect to the rotation speed N when the reference position is the boundary position between the fall of the positive half cycle and the rise of the negative half cycle of the exciter coil 104.

On the other hand, since the ignition energy storage capacitor is not charged in the negative half cycle of the exciter coil, if the load of the exciter coil in the negative half cycle is made as small as possible, the exciter coil 104 The negative half-cycle output voltage waveform of
In the process in which the level of the output voltage rises toward the peak value, it matches the waveform when there is no load. Therefore, the reference voltage Vr
The position where the output voltage level of the negative half cycle of the exciter coil matches the predetermined threshold level (varies according to the output voltage and output frequency of the exciter coil) by setting the change ratio of the level of Is a reference position, the reference position is substantially constant regardless of the rotation speed N, as indicated by a straight line B indicated by a broken line in FIG.

Embodiment of FIG. 2 In the above embodiment, the fixed ignition position signal obtained by inverting the reference signal by the inverter 7 is input to the OR circuit to obtain the ignition signal when the microcomputer cannot operate. However, in this case, the reference signal must be generated at the maximum advance position, so if the fixed ignition position signal is given by the reference signal,
Ketching may occur when the engine is started. Figure 2
Shows an example in which the occurrence of ketching is prevented when the engine is started. In this example, the peak position of the negative half cycle output voltage (output voltage in the non-charging section) of the exciter coil is detected. A peak detection circuit 15 that outputs a peak detection signal and an interrupt signal output circuit 16 that outputs an interrupt signal for resetting the flip-flop circuit 4j when the peak detection signal is generated are provided.

The peak detection circuit 15 includes first and second peak detection transistors Tr6 and Tr7, a peak detection capacitor C5, diodes D11 and D12, and a resistor R.
17 and R18, the interrupt signal output circuit 16 is
It is composed of a transistor Tr8 and resistors R19 and R20.

More specifically, the resistors R11 and R12 are
The emitter of the transistor Tr6 and the emitter of the transistor Tr7 are commonly connected to the connection point of, and the diode D11 is connected between the emitter base of the transistor Tr6.
A capacitor C5 is connected between the grounded base of the transistor Tr6 and a resistor R17 is connected between the grounded collector of the transistor Tr6. The base of the transistor Tr7 is connected to the collector of the transistor Tr6 through the diode D12, and one end of the resistor R18 is connected to the collector of the transistor Tr7. The other end of the resistor R18 is connected to the base of the transistor Tr8 whose emitter is grounded, and the resistor R20 is connected between the grounded base of the transistor Tr8.
The collector of the transistor Tr8 is connected to the output terminal of the power supply circuit (not shown in FIG. 2) through the resistor R19, and is also connected to the input terminal of the interrupt control circuit 4b through a predetermined input port of the microcomputer 4. . The collector of the second peak detection transistor Tr7 of the peak detection circuit 15 is connected to the anode of the diode D3 of the OR circuit 8 through the resistor R21.

Also in this embodiment, a reference signal generation circuit 13 including a reference voltage generation circuit 11 and a reference signal output circuit 12 similar to those used in the embodiment of FIG. 1 is provided, and the reference signal output circuit 12 is provided. The collector of the transistor Tr4 is connected to the input terminal of the interrupt control circuit 4b through a predetermined input port of the microcomputer. The other points are similar to those of the embodiment of FIG. 1, and although not shown, a power supply circuit similar to that shown in FIG. 1 is used.

In the embodiment of FIG. 2, when the exciter coil 104 generates a negative half cycle output voltage, the voltage Vb appears at the voltage dividing point of the voltage dividing circuit composed of the resistors R11 and R12, and the first peak detecting A current flows through the emitter and base of the transistor Tr6 and the peak detecting capacitor C5. While this current is flowing, the transistor Tr6 is conductive, and while the transistor Tr6 is conductive, the transistor Tr7 is held in the cutoff state. Exciter coil 1
When the output voltage of the negative half cycle of 04 reaches the peak,
Since the charging of the capacitor C5 is completed and the base current does not flow through the transistor Tr6, the transistor Tr6 is turned off and the transistor Tr7 is turned on. for that reason,
A peak detection signal is output from the exciter coil 104 through the transistor Tr7, and this peak detection signal is input to the diode D3 of the OR circuit 7 as a fixed ignition position signal. Therefore, in this embodiment, when the microcomputer is in an inoperable state, the peak detection signal obtained from the peak detection circuit 15 provides the ignition signal to the discharging thyristor Th1.

Further, when the transistor Tr7 becomes conductive at the peak position of the output voltage of the negative half cycle of the exciter coil, the transistor Tr8 of the interrupt signal output circuit 16 becomes conductive and the potential of its collector drops, so that the interrupt control of the microcomputer is performed. The interrupt signal IN2 is supplied to the circuit 4b. The interrupt signal resets the flip-flop circuit 4j.

In the same way as the embodiment of FIG. 1, the level of the output voltage Vb of the voltage detection circuit 20 becomes the level of the reference voltage Vr in the process of increasing the level of the output voltage of the negative half cycle of the exciter coil. Transistor T when matched
r4 becomes conductive and the potential of its collector drops. The decrease in the potential of the collector of the transistor Tr4 (reference signal) is given to the microcomputer as the external interrupt signal IN1.

The overall operation of the embodiment of FIG. 2 is shown in FIG. 13 except that the reference signal is generated and the ignition signal is generated when the microcomputer cannot operate. This is similar to the operation of the conventional device.

With the configuration of the embodiment of FIG. 2, when the microcomputer cannot operate, the ignition signal is output at the peak position of the output voltage of the negative half cycle of the exciter coil 104, which is delayed from the generation position of the reference signal. Since it can be given, the peak position of the output voltage of the negative half cycle of the exciter coil is set to a position that does not cause ketching when starting the engine, so that the engine can be started without causing ketching. You can

Embodiment of FIG. 3 FIG. 3 shows still another embodiment of the present invention. In this embodiment, the transistor Tr4 of the reference signal output circuit 12 similar to that used in the embodiment of FIG. 1 is used. The signal obtained at the collector of the inverter is inverted by the inverter 17 and the external interrupt signal IN2 is supplied to the interrupt control circuit 4b of the microcomputer 4.
Is given as. Further, the change in the potential of the collector of the transistor Tr4 is input to the level change detection circuit 18 composed of a differentiating circuit composed of the capacitor C6 and the resistor R22, and the output of the level change detection circuit 18 is supplied to the OR circuit 8 as a fixed ignition position signal. It has been entered. The other points are similar to those of the embodiment of FIG.

In the embodiment shown in FIG. 3, the reference signal generating circuit 13
By the inverter 17, the level change detection circuit 18, and the level of the output voltage Vb of the voltage detection circuit 20 in the process of increasing the output voltage level of the magneto-generator in the non-charge section toward the peak value, A reference signal is generated when the output voltage of the magneto-generator in the non-charging section passes the peak and then falls, and the output voltage of the voltage detection circuit matches the reference voltage level. A reference signal / fixed ignition position signal generation circuit is sometimes configured to generate a fixed ignition position signal.

In the embodiment shown in FIG. 3, the exciter coil 10 is used.
If the level of the output voltage Vb of the voltage detection circuit 20 matches the level of the reference voltage Vr in the process in which the output voltage of the negative half cycle of 4 rises toward the peak value, the transistor T
Since r4 becomes conductive and the potential of its collector drops, the external interrupt signal IN1 is applied to the microcomputer 4.

Further, the level of the output voltage Vb of the voltage detection circuit 20 changes from the reference voltage Vb in the process of the output voltage level of the negative half cycle of the exciter coil passing the peak and decreasing.
When the transistor Tr4 matches the level of r and is turned off, the potential of the collector changes from the low level to the high level, so that the output voltage level of the inverter 17 changes from "1" to "0". And the interrupt signal IN2 is supplied to the microcomputer 4. Further, the level change detection circuit 18 changes the level (changes from the low level to the high level) when the transistor Tr4 is turned off.
The pulse signal is generated from the detection circuit 18, and the pulse signal is input to the OR circuit 8 as a fixed ignition position signal.

That is, in the embodiment of FIG. 3, the output voltage Vb of the voltage detection circuit 20 coincides with the level of the reference voltage Vr in the process in which the output voltage of the negative half cycle of the exciter coil rises toward the peak value. A reference signal is generated when
The fixed ignition position signal is generated when the output voltage level of the negative half cycle of the exciter coil passes the peak and drops, and when the output voltage level of the voltage detection circuit matches the reference voltage level. At the position where this fixed ignition position signal is generated, the interrupt signal IN2 is sent to the microcomputer.
Is given to reset the flip-flop circuit 4j.

In the embodiment of FIG. 3 as well, the position where the output voltage level of the negative half cycle of the exciter coil coincides with the reference voltage level in the course of falling past the peak (fixed ignition position signal generation position). ) Is set to a position that does not cause ketching when the ignition operation is performed at that position when the engine is started, the engine can be started without causing ketching.

Embodiment of FIG. 4 FIG. 4 shows a modification of the embodiment of FIG. 3, in which the calculated ignition position signal supply circuit 9 is constructed similarly to the embodiment of FIG. In this case, since the calculated ignition position signal has a pulse waveform, the reset of the flip-flop circuit 4j can be delayed until the reference position at which the next interrupt signal IN is input. The reset of the flip-flop circuit 4j may be performed when the interrupt signal IN is applied, or may be performed before the interrupt signal IN is applied by software that operates the microcomputer.

In each of the above embodiments, the reference voltage generating circuit is connected in series to the trigger signal input terminal of the switch for outputting the reference signal (transistor Tr4 in the above embodiments), and the negative voltage of the exciter coil is connected. The reference signal is generated when the output voltage of the half cycle matches the predetermined threshold level (when the output voltage of the voltage detection circuit matches the reference voltage). The circuit may be a circuit that compares the detected value of the output voltage of the magnet generator generated in the non-charge section with the reference voltage and generates a signal when the detected value of the output voltage matches the reference voltage, It is not limited to the above embodiment.

Embodiment of FIG. 5 FIG. 5 shows still another embodiment of the present invention in which the configuration of the reference signal generating circuit is different. In this embodiment, the output of the negative half cycle of the exciter coil is shown. A capacitor C3 charged through a diode D8 and a resistor R23 by a voltage (output voltage of the voltage detection circuit) Vb obtained by dividing the voltage by a voltage divider circuit composed of resistors R11 and R12, and is connected to both ends of the capacitor C3. The reference voltage generating circuit 11 is constituted by the resistor R13 and the reference voltage Vr obtained across the capacitor C3 is input to the non-inverting input terminal of the comparator CP. The output voltage Vb of the voltage detection circuit 20 is input to the inverting input terminal of the comparator CP, and the output terminal of the comparator CP is connected to the output terminal of the power supply circuit 10 through the resistor R24. In this example, the comparator CP configures the reference signal output circuit 12, and the reference signal output circuit 12 and the reference voltage generation circuit 11 configure the reference signal generation circuit 13.

The signal obtained at the output terminal of the comparator CP is input to the interrupt signal input port of the microcomputer 4 and also input to the OR circuit 8 through the inverter 7 '. The other points are the same as in the embodiment of FIG.

In the embodiment shown in FIG. 5, the capacitor C3
The level of the reference voltage Vr obtained at both ends of the output voltage changes with the change of the peak value and the frequency of the output voltage of the negative half cycle of the exciter coil. When the level of the output voltage Vb of the voltage detection circuit 20 matches the level of the reference voltage Vr in the process in which the output voltage of the negative half cycle of the exciter coil rises toward the peak value, the output terminal of the comparator CP The potential falls to a low level. This decrease in potential is given to the microcomputer as an interrupt signal IN (reference signal). Further, the decrease in the potential of the output terminal of the comparator CP is inverted by the inverter 7'and is given to the OR circuit 8 as a fixed ignition position signal. The other points are the same as in the embodiment of FIG.

In each of the above embodiments, the reference position is detected using the waveform of the output voltage of the negative half cycle of the exciter coil. However, in the present invention, the non-charging section (of the ignition energy storage capacitor) is used. When the reference position is detected by using the waveform of the output voltage of the half cycle of the magneto generator in the rotation angle section (where charging is not performed), if a magneto coil other than the exciter coil is provided in the magnet generator Alternatively, the reference signal may be obtained by utilizing the waveform of the output voltage of the half cycle in the non-charging section of the other power generating coil.

Embodiment of FIG. 6 FIG. 6 shows an embodiment in which the reference signal is generated by utilizing the output of a magneto coil other than the exciter coil. In this embodiment, the magnet generator 1 is used. Stator 1B
Of the iron core 105, the iron core 105 having a pair of side legs 105a and 105b, and salient pole portions 105e and 105f provided at the central portions of the yoke portions 105c and 105d connecting between the both side legs, respectively. It is composed of an exciter coil 104 and a power-generating coil 106 wound around side legs 105a and 105b, respectively, and pole piece portions 105e1 and 105f1 formed at the tips of salient pole portions 105e and 105f serve as a two-pole magnet rotor 1A. They are facing each other.

In this magnet generator, the exciter coil 1
04 and the generator coil 106 output AC voltage of the same phase of one cycle per one revolution of the engine.

In the embodiment shown in FIG. 6, diodes D5 and D6 are respectively connected between one end and the other end of the magneto coil 106 and the ground.
Is connected, and a power supply circuit 10 'having a configuration different from that shown in FIG. 1 is connected between one end of the power generation coil 106 and the ground. The power supply circuit 10 'has a series circuit of a diode D1 and a power supply capacitor C2 connected between one end of the power generation coil 106 and ground, and a cathode connected to the ground side between one end of the power generation coil 106 and ground. Thyristor Th2
And a series circuit of resistors R25 and R26 connected to both ends of the capacitor C2, and an anode between the connection point of the resistors R25 and R26 and the gate of the thyristor Th2.
Zener diode Z connected toward the gate side of h2
D and a resistor R27 connected between the gate and cathode of the thyristor Th2.

In this power supply circuit, the generator coil 10
The positive half cycle output voltage of 6 charges capacitor C2 through diode D1. When the voltage across capacitor C2 exceeds the set value, Zener diode Z
Since D conducts and triggers thyristor Th2, the thyristor conducts and bypasses the charging current of capacitor C2 from the capacitor. By these operations, the capacitor C
The voltage across 2 is kept constant.

A resistor R is placed between the other end of the magneto coil 106 and the ground.
A voltage dividing circuit consisting of a series circuit of 11 and R12 is connected, and the voltage detecting circuit 20 is constituted by this voltage dividing circuit and the diodes D8 and D5. The output voltage Vb of the voltage detection circuit 20 is input to the reference signal generation circuit 13. The configuration of the reference signal generation circuit 13 is the same as that shown in the embodiment of FIG. 1, and the collector of the transistor Tr4 constituting the reference signal generation switch is connected to the output terminal of the power supply circuit 10 'through the resistors R1a and R1b. ing. One end of the exciter coil 104 is connected to one end of an ignition energy storage capacitor C1 through a diode D1 and the other end is grounded. The other points are the same as in the embodiment of FIG. The operation of the embodiment of FIG. 6 is such that the negative half-cycle output voltage generated by the generator coil 106 while the exciter coil is generating the negative half-cycle output voltage (the magnet generator 1 in the non-charging section). The operation is the same as that of the embodiment of FIG. 1 except that the reference signal is generated using the waveform of the output voltage (half cycle).

In the embodiments of FIGS. 1, 4, 5 and 6,
Since the fixed ignition position signal when the microcomputer cannot operate is obtained using the reference signal, the position where the reference signal is generated is a position where the ignition operation may be performed, and the reference is used as a reference for measuring the ignition position. It is necessary to set it in a position that does not hinder the above. Therefore, FIG. 1, FIG. 4, FIG. 5 and FIG.
In this embodiment, the reference position needs to be equal to the maximum advance position.

On the other hand, in the embodiment of FIGS. 2 and 3,
To generate a fixed ignition position signal when the microcomputer cannot operate at a position delayed from the reference signal,
The position where the reference signal is generated may be a position suitable as a reference when measuring the ignition position, and is not necessarily the maximum advance position. Therefore, in the embodiments of FIGS. 2 and 3, the generation position of the reference signal can be set to a position further advanced than the maximum advance position.

In each of the above-described embodiments, the transistor Tr4 of the reference signal generating circuit when the detected value matches the reference voltage in the process in which the output voltage of the magneto generator in the non-charge section rises toward the peak. The change in the voltage obtained at both ends of the (reference signal generation switch) is used as the reference signal, but the detected value is referenced in the process of the output voltage of the magneto generator in the non-charging section passing through the peak and falling. The change in the voltage across the transistor Tr4 that occurs when the voltage matches the voltage may be used as the reference signal. In this case, for example, the output signal of the inverter 17 of the embodiment of FIG. 3 or the signal obtained by inverting the output pulse of the level detection circuit 18 by the inverter may be used as the reference signal (external interrupt signal IN1). Good.

The peak detection circuit used in the embodiment of FIG.
The peak detecting capacitor, the first peak detecting transistor which is turned on by the negative half cycle output of the exciter coil and which is supplied with the base current through the peak detecting capacitor, and the first peak detecting transistor are turned on. And a second peak detecting transistor that holds the cutoff state at a certain time and becomes conductive when the first peak detecting transistor becomes the cutoff state and outputs a reference signal. The specific configuration is not limited to that of the above embodiment.

For example, as shown in FIG. 12, a first peak detecting transistor Tr6 'and a second peak detecting transistor Tr7', resistors R17 'and R18', a peak detecting capacitor C5 'and a diode D12'. You may comprise a peak detection circuit by.

In the peak detection circuit of FIG. 12, when the magneto-generator generates a half cycle output voltage in the non-charging section, the base current flows through the transistor Tr6 'through the capacitor C5' and the transistor Tr6 'becomes conductive. .
While the transistor Tr6 'is conducting, the transistor T
r7 'is kept in the cutoff state. When the negative half cycle output voltage of the exciter coil reaches a peak, the capacitor C
Since the charging of 5'is stopped, the transistor Tr6 'is turned off and the transistor Tr7' is turned on. Therefore, at the peak position of the output of the negative half cycle of the exciter coil, the reference signal is output through the collector-emitter circuit of the transistor Tr7 'and the resistor R18'.

The ignition circuit 3 used in the present invention is not limited to the one shown in the above embodiment. For example, in FIG. 1, the ignition energy storage capacitor C1 is used.
Of course, the present invention can be applied to the case where a known capacitor discharge type ignition circuit in which the positions of the discharge thyristor Th1 and the discharge thyristor Th1 are exchanged is used.

In the present invention, it is necessary to reduce the load of the magneto generator in the non-charge section as much as possible. Therefore, as the power supply of the power supply circuit, as shown in FIG.
Of the exciter coil 104 as shown in the embodiment of FIG. 6, or another generator coil 1 provided in the magnet generator as in the embodiment of FIG.
It is preferable to utilize the output of 06. It is preferable to minimize the current flowing from the exciter coil 104 or the generator coil 106 to the reference signal generating circuit 13 and the peak position detecting circuit 15 by increasing the impedance of the voltage dividing circuit including the resistors R11 and R12 as much as possible.

As in the embodiment of FIG. 6, when a reference signal is generated by using a generator coil 106 other than the exciter coil, the generator coil 106 generates a voltage having a phase opposite to the voltage generated by the exciter coil. (For example, the winding direction of the generating coil 106 is opposite to the winding direction of the exciter coil 104), and the output voltage of the positive half cycle of the generating coil 106 (non-charging section) Alternatively, the reference signal may be obtained by using the waveform of the output voltage of the magnet generator in FIG.

In each of the above-mentioned embodiments, the rotor of the magnet generator is constructed with two poles, and the magnet generator induces an alternating voltage of one cycle per one revolution of the engine. The invention is not limited to the case of using the magnet generator having the two-pole rotor as described above, and the present invention can be applied to the case of using the magnet generator having the multi-pole magnet rotor. For example, when a 4-pole magnet rotor is used, the magnet generator outputs an AC voltage of 2 cycles per revolution of the engine, so that the reference signal is generated twice and the ignition operation is performed twice per revolution. In a two-cycle engine, if one of the two sparks generated at 180 degrees intervals is generated at a predetermined ignition position, the other spark will affect the operation of the engine. Since it occurs at a non-existing position (for example, at the end of the exhaust stroke of the engine), it does not hinder the operation of the engine.

When a battery is installed,
You may make it drive a microcomputer etc. using this battery.

In the case where a battery is mounted on a vehicle, a ship, or the like, when a so-called battery exhaustion occurs, the microcomputer is operated so that the engine can be operated without hindrance. As in the embodiment, it is preferable to configure the microcomputer so that it can be driven by the output of the magnet electric machine.

In the above-mentioned embodiment, the microcomputer is constructed so as to recognize the signal of the negative logic, but when the microcomputer which recognizes the signal of the positive logic is used, the signal of the circuit of the above-mentioned embodiment is further added. The present invention can be implemented by appropriately adding a circuit for inverting the polarity of, or by changing the place where the signal is taken out.

The preferred embodiments of the present invention have been described above. The main aspects of the invention disclosed in this specification are as follows.

(1) A magnet generator having at least an exciter coil for charging a capacitor on the stator side and generating an AC voltage in synchronization with the rotation of the internal combustion engine, and an ignition provided on the primary side of the ignition coil. The energy storage capacitor and the rotation angle section in which the exciter coil generates a positive half-cycle output voltage and the rotation angle section in which a negative half-cycle output voltage is generated are respectively used as a charging section and a non-charging section of the capacitor. A capacitor charging circuit that charges the capacitor by the output voltage of the exciter coil in the section; a discharging switch that conducts when an ignition signal is given to discharge the electric charge of the capacitor to the primary coil of the ignition coil; The level of the output voltage of the magneto generator in the charging section changes in the output voltage and the output frequency of the magneto generator. A reference signal generating circuit for generating a reference signal when the threshold level changes according to a predetermined threshold level, ignition position calculating means for calculating an ignition position at each rotation speed of the internal combustion engine, and the reference. And a calculation ignition position signal generation means for generating a calculation ignition position signal when the ignition position calculation means starts measurement of the ignition position and when the ignition position measurement is completed. The calculated ignition position signal is generated by adjusting the rate of change of the threshold level so that the generation position of the reference signal is kept constant regardless of the peak value and frequency of the output voltage of the magneto generator in the charging section. An ignition device for a capacitor discharge type internal combustion engine which gives an ignition signal to the discharge switch at the time of performing.

(2) A magnet generator having at least an exciter coil for charging a capacitor on the stator side, which generates an AC voltage in synchronization with the rotation of the internal combustion engine, and an ignition provided on the primary side of the ignition coil. The energy storage capacitor and the rotation angle section in which the exciter coil generates a positive half-cycle output voltage and the rotation angle section in which a negative half-cycle output voltage is generated are respectively used as a charging section and a non-charging section of the capacitor. A capacitor charging circuit that charges the capacitor by the output voltage of the exciter coil in the section; a discharging switch that conducts when an ignition signal is given to discharge the electric charge of the capacitor to the primary coil of the ignition coil; Voltage detection circuit for detecting the output voltage of the magneto generator in the charging section, and the output voltage of the voltage detection circuit The reference signal generation circuit that generates a reference signal when the level of the reference voltage level changes according to the output voltage and output frequency of the magneto generator in the non-charge section, and Ignition position calculation means for calculating the ignition position, and a calculation ignition position signal when the measurement of the ignition position is started when the reference signal is generated and the measurement of the ignition position is completed. And a calculated ignition position signal generating means for generating the reference voltage level so as to keep the generation position of the reference signal constant regardless of the peak value and frequency of the output voltage of the magneto generator in the non-charging section. A capacitor discharge type ignition device for an internal combustion engine, wherein a rate of change is adjusted and an ignition signal is given to the discharge switch when the calculated ignition position signal is generated.

(3) The reference signal generating circuit includes a reference voltage generating circuit including a capacitor and a discharging resistor connected in parallel with the capacitor, and an output voltage of the voltage detecting circuit, which is used as a base through the reference voltage generating circuit. 3. A capacitor discharge type internal combustion engine ignition device according to claim 2, further comprising a transistor switch provided to operate when a current is applied, wherein a change in voltage across the transistor switch is used as the reference signal. .

(4) A magnet generator having at least an exciter coil for charging a capacitor on the stator side and generating an AC voltage in synchronization with the rotation of the internal combustion engine, and an ignition provided on the primary side of the ignition coil. The energy storage capacitor and the rotation angle section in which the exciter coil generates a positive half-cycle output voltage and the rotation angle section in which a negative half-cycle output voltage is generated are respectively used as a charging section and a non-charging section of the capacitor. A capacitor charging circuit that charges the capacitor by the output voltage of the exciter coil in the section; a discharging switch that conducts when an ignition signal is given to discharge the electric charge of the capacitor to the primary coil of the ignition coil; A voltage detection circuit for detecting the output voltage of the magnet generator in the charging section, and a magnet in the non-charging section A reference voltage generation circuit that generates a reference voltage whose level changes according to changes in the output voltage and output frequency of the generator, and a reference signal when the level of the output voltage of the voltage detection circuit matches the level of the reference voltage. A reference signal output circuit, an ignition position calculation means for calculating the ignition position at each rotation speed of the internal combustion engine, and a measurement of the ignition position calculated by the ignition position calculation means when the reference signal is generated. And a calculated ignition position signal generating means for generating a calculated ignition position signal when the measurement of the ignition position is completed, and the reference is irrespective of the peak value and frequency of the output voltage of the magneto generator in the non-charging section. The rate of change in the level of the reference voltage is adjusted so that the signal generation position is constant, and the discharge switch is ignited when the calculated ignition position signal is generated. Capacitor discharge ignition device to provide a degree.

(5) The reference voltage generating circuit comprises a capacitor charged by the output voltage of the voltage detecting circuit and a discharging resistor connected in parallel to the capacitor. Capacitor discharge type internal combustion engine ignition device.

(6) In the above item 5, the reference signal output circuit is provided with a transistor provided so that a base current is applied to make conductive when the output voltage of the voltage detection circuit exceeds a reference voltage. A capacitor discharge type internal combustion engine ignition device as described.

(7) The reference signal output circuit compares the output voltage of the voltage detection circuit with a reference voltage, and produces a different output according to the magnitude relation between the output voltage of the voltage detection circuit and the reference voltage. An ignition device for a capacitor discharge type internal combustion engine according to item 4 or 5 above.

(8) A magnet generator that has at least an exciter coil for charging a capacitor on the stator side and generates an AC voltage in synchronization with the rotation of the internal combustion engine, and an ignition provided on the primary side of the ignition coil. The energy storage capacitor and the rotation angle section in which the exciter coil generates a positive half-cycle output voltage and the rotation angle section in which a negative half-cycle output voltage is generated are respectively used as a charging section and a non-charging section of the capacitor. A capacitor charging circuit that charges the capacitor by the output voltage of the exciter coil in the section; a discharging switch that conducts when an ignition signal is given to discharge the electric charge of the capacitor to the primary coil of the ignition coil; A voltage detection circuit for detecting the output voltage of the magnet generator in the charging section, and a magnet in the non-charging section A reference voltage generation circuit that generates a reference voltage whose level changes according to changes in the output voltage and output frequency of the generator, and a reference signal when the level of the output voltage of the voltage detection circuit matches the level of the reference voltage. A reference signal output circuit, an ignition position calculation means for calculating the ignition position at each rotation speed of the internal combustion engine, and a measurement of the ignition position calculated by the ignition position calculation means when the reference signal is generated. And a calculated ignition position signal generating means for generating a calculated ignition position signal when the measurement of the ignition position is completed, and a peak position of the output voltage of the magneto generator in the non-charge section is detected and a peak detection signal is output. A peak detection circuit, an OR circuit that receives the calculated ignition position signal and the peak detection signal, and bypasses the peak detection signal from the OR circuit when conducting. A mask switch trigger means for triggering the mask switch to conduct in a region where the number of revolutions of the internal combustion engine is equal to or higher than a set value, and the magnet power generation in the non-charging section. The rate of change in the level of the reference voltage is adjusted so that the position where the reference signal is generated is constant irrespective of the peak value and frequency of the output voltage of the machine, and the output of the OR circuit is used as the ignition signal for discharging. An ignition device for a capacitor discharge type internal combustion engine, characterized in that it is provided to a switch.

(9) The peak detection circuit includes a peak detection capacitor, and a first peak detection transistor which is turned on by the negative half cycle output of the exciter coil to which a base current is applied through the peak detection capacitor. A second peak that holds a cutoff state when the first peak detection transistor is in a conductive state and is in a conduction state when the first peak detection transistor is in a cutoff state and outputs a reference signal 9. The capacitor discharge type internal combustion engine ignition device as described in 8 above, which comprises a detection transistor.

(10) A magnet generator having at least an exciter coil for charging a capacitor on the stator side, which generates an AC voltage in synchronization with the rotation of the internal combustion engine, and an ignition provided on the primary side of the ignition coil. The energy storage capacitor and the rotation angle section in which the exciter coil generates a positive half-cycle output voltage and the rotation angle section in which a negative half-cycle output voltage is generated are respectively used as a charging section and a non-charging section of the capacitor. A capacitor charging circuit that charges the capacitor by the output voltage of the exciter coil in the section, a discharge switch that conducts when an ignition signal is given and discharges the electric charge of the capacitor to the primary coil of the ignition coil, and an internal combustion engine A reference signal generating circuit for generating a reference signal at a reference position for starting measurement of the ignition position of the internal combustion engine; Ignition position calculation means for calculating the ignition position at each rotation speed, a reference voltage generation circuit for generating a reference voltage whose level changes with changes in the output voltage and output frequency of the magneto generator in the non-charging section, and A voltage detection circuit for detecting the output voltage of the magneto generator in the non-charge section, and a level of the output voltage of the voltage detection circuit in the process of increasing the level of the output voltage of the magneto generator in the non-charge section toward a peak value. Generates the reference signal when the output voltage level of the magneto-generator in the non-charging section goes past the peak and drops, and the reference voltage of the output voltage of the voltage detection circuit is referred to. A reference signal / fixed ignition position signal generation circuit that generates a fixed ignition position signal when the voltage level matches, and an ignition position calculation when the reference signal is generated. A calculation ignition position signal generating means for generating a calculation ignition position signal when the measurement of the ignition position calculated by the step is completed and the measurement of the ignition position is completed; and the calculation ignition position signal and the fixed ignition position signal. As an input, an OR circuit that gives the ignition signal to the discharge switch when either of the ignition position signals is input is provided, and the peak value and the frequency of the output voltage of the magneto generator in the non-charging section are included. An ignition device for a capacitor discharge internal combustion engine, wherein the rate of change in the level of the reference voltage is adjusted so that the position at which the reference signal is generated is constant regardless of the condition.

(11) The reference signal / fixed ignition position signal generating circuit includes a transistor switch which operates by being supplied with a base current by the output voltage of the voltage detecting circuit through the reference voltage generating circuit, and a magnet in the non-charging section. A level for detecting a change in the voltage level generated across the transistor switch when the level of the output voltage of the voltage detection circuit matches the level of the reference voltage in the process of the output voltage of the generator dropping past the peak. A detection circuit, and the transistor switch when the output voltage level of the voltage detection circuit coincides with the reference voltage level in the process in which the output voltage of the magneto-generator in the non-charging section rises toward the peak. Using the change in the voltage level occurring across both ends as the reference signal, the output of the level detection circuit is changed to the fixed ignition. The capacitor discharge type internal combustion engine ignition device according to the above item 10, which is used as a position signal.

[0144]

As described above, according to the present invention, the output voltage of the magnet generator in the non-charging section in which the ignition energy storage capacitor is not charged is determined by the output voltage and the output frequency of the magnet generator. The reference signal generating circuit is configured to generate the reference signal when the threshold level changes with the change, and the peak value and frequency of the output voltage of the magneto generator in the non-charging section are determined. The rate of change of the threshold level is adjusted so that the position where the reference signal is generated is constant regardless of the reference position.Therefore, without using a signal generator, the output waveform of the magnet generator is used to change the reference position. Can be detected.
Therefore, the signal generator can be omitted and the structure of the magnet generator can be simplified, and the device can be downsized and the cost can be reduced.

Further, according to the invention described in claims 6 to 8, the fixed ignition position signal is generated so that the ignition signal is given to the discharge switch even when the microcomputer cannot operate. There is an advantage that the engine can be operated even when it cannot operate.

According to the invention described in claim 7, the output voltage level of the voltage detection circuit is higher than the reference voltage in the process of increasing the output voltage level of the magneto-generator in the non-charging section toward the peak. Since the reference signal is generated when the level matches and the ignition signal is given to the discharge switch when the output of the magnet generator reaches the peak, the fixed ignition position signal is generated at the delayed position. It is possible to retard the ignition position at the time of starting when the microcomputer cannot operate, and prevent the Ketchin phenomenon from occurring at the time of starting the engine.

Further, according to the invention described in claim 8, in the process in which the output voltage level of the magneto-generator in the non-charging section rises toward the peak, the output voltage level of the voltage detection circuit becomes equal to the reference voltage. A reference signal is generated when the level matches the level, and an ignition signal is given to the discharge switch when the level of the output voltage of the magneto-generator matches the level of the reference voltage in the process of passing the peak and decreasing. Therefore, the retard angle width of the ignition position in a state where the microcomputer cannot operate can be made larger than that according to the invention described in claim 7, and it is more effective that the Ketchin phenomenon occurs at the time of starting the engine. Can be prevented.

[Brief description of drawings]

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

FIG. 2 is a circuit configuration diagram showing a configuration of another embodiment of the present invention.

FIG. 3 is a circuit configuration diagram showing still another embodiment of the present invention.

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

FIG. 5 is a circuit configuration diagram showing still another embodiment of the present invention.

FIG. 6 is a circuit configuration diagram showing still another embodiment of the present invention.

FIG. 7 is a waveform diagram showing a magnetic flux interlinking with the exciter coil and an induced voltage in the exciter coil.

FIG. 8 shows a case where the reference position is determined by using the boundary position between the falling edge of the positive half cycle and the rising edge of the negative half cycle of the exciter coil, and the peak output of the negative half cycle of the exciter coil. It is the diagram which compared and showed the characteristic of the change with respect to the number of rotations of a reference (standard) position when a reference (standard) position is determined using a position.

FIG. 9 is a waveform diagram showing signals at various parts of the embodiment of FIG.

FIG. 10 is a flowchart showing an algorithm of a main routine executed by a microcomputer in the embodiment of the present invention.

FIG. 11 is a flowchart showing an algorithm of an interrupt routine executed by a microcomputer in the embodiment of the present invention.

FIG. 12 is a circuit diagram showing a configuration example of a peak detection circuit used in an embodiment of the present invention.

FIG. 13 is a circuit configuration diagram showing a configuration of a conventional ignition device.

FIG. 14 is a waveform diagram showing signal waveforms of respective parts of the ignition device of FIG.

[Explanation of symbols]

 1 Magnetogenerator 3 Ignition circuit 4 Microcomputer 8 OR circuit 9 Calculation ignition position signal supply circuit 11 Reference voltage generation circuit 12 Reference signal output circuit 13 Reference signal generation circuit 14 Fixed ignition position signal mask circuit

Claims (8)

[Claims] 1. A magneto generator having at least an exciter coil for charging a capacitor on a stator side, which generates an AC voltage in synchronization with rotation of an internal combustion engine, and ignition energy provided on a primary side of an ignition coil. A storage capacitor and a rotation angle section in which the exciter coil generates a positive half-cycle output voltage and a rotation angle section in which a negative half-cycle output voltage is generated are a charging section and a non-charging section of the capacitor, respectively, and the charging section. In the internal combustion engine, a capacitor charging circuit that charges the capacitor by the output voltage of the exciter coil, a discharge switch that conducts when an ignition signal is given, and discharges the electric charge of the capacitor to the primary coil of the ignition coil, A reference signal generation circuit that generates a reference signal at the reference position for starting the measurement of the ignition position,
Ignition position calculation means for calculating the ignition position at each rotation speed of the internal combustion engine, and measurement of the ignition position calculated by the ignition position calculation means when the reference signal is generated is started and measurement of the ignition position is completed. In the ignition device for a capacitor discharge type internal combustion engine, which comprises an operation ignition position signal generating means for generating an operation ignition position signal, and which gives an ignition signal to the discharge switch when the operation ignition position signal is generated, The signal generation circuit detects that the level of the output voltage of the magneto generator in the non-charge section matches the threshold level whose magnitude changes in accordance with the change of the output voltage and the output frequency, and outputs the reference signal. The reference signal is generated regardless of the peak value and frequency of the output voltage of the magneto generator in the non-charging section. As the location is fixed, capacitor discharge ignition device for an internal combustion engine wherein the rate of change of the threshold level is adjusted. 2. A magnet generator having at least an exciter coil for charging a capacitor on a stator side, which generates an AC voltage in synchronization with rotation of an internal combustion engine, and ignition energy provided on a primary side of an ignition coil. A storage capacitor and a rotation angle section in which the exciter coil generates a positive half-cycle output voltage and a rotation angle section in which a negative half-cycle output voltage is generated are a charging section and a non-charging section of the capacitor, respectively, and the charging section. In the internal combustion engine, a capacitor charging circuit that charges the capacitor by the output voltage of the exciter coil, a discharge switch that conducts when an ignition signal is given, and discharges the electric charge of the capacitor to the primary coil of the ignition coil, A reference signal generation circuit that generates a reference signal at the reference position for starting the measurement of the ignition position,
Ignition position calculation means for calculating the ignition position at each rotation speed of the internal combustion engine, and measurement of the ignition position calculated by the ignition position calculation means when the reference signal is generated is started and measurement of the ignition position is completed. In the ignition device for a capacitor discharge type internal combustion engine, which comprises an operation ignition position signal generating means for generating an operation ignition position signal, and which gives an ignition signal to the discharge switch when the operation ignition position signal is generated, The signal generation circuit includes a reference voltage generation circuit that generates a reference voltage whose level changes according to changes in the output voltage and output frequency of the magneto generator in the non-charge section, and an output voltage of the magneto generator in the non-charge section. And a voltage detection circuit for detecting the voltage, and outputs the standard signal when the level of the output voltage of the voltage detection circuit matches the level of the reference voltage. A reference signal output circuit, and a change in the level of the reference voltage so that the position at which the reference signal is generated is constant regardless of the peak value and the frequency of the output voltage of the magneto generator in the non-charging section. An ignition device for a capacitor discharge type internal combustion engine, characterized in that the ratio is adjusted. 3. The reference voltage generating circuit includes a capacitor charged by the output voltage of the magneto generator in the non-charging section, and a discharging resistor connected in parallel to the capacitor. An ignition device for a capacitor discharge type internal combustion engine according to item 1. 4. The reference signal output circuit is configured such that the output voltage level of the voltage detection circuit is equal to the reference voltage in the process of increasing the output voltage level of the magneto generator in the non-charging section toward the peak value. The reference signal generating switch which operates when the level is matched is provided, and the change in the voltage across the switch when the reference signal generating switch operates is used as the reference signal. Capacitor discharge type internal combustion engine ignition device. 5. The reference level detection circuit, wherein the reference signal output circuit takes different states depending on whether the output voltage level of the voltage detection circuit is equal to or lower than the reference voltage level or exceeds the reference voltage level. Switch and the reference level detection when the output voltage level of the voltage detection circuit becomes equal to or lower than the reference voltage level in the process of the output voltage level of the magneto-generator in the non-charging section passing a peak and decreasing. 5. A capacitor discharge type internal combustion engine ignition device according to claim 2, further comprising a level change detection circuit that detects a change in voltage level across the switch for outputting the reference signal. 6. An OR circuit to which the calculated ignition position signal and a reference signal are input, a mask switch provided so as to bypass the reference signal from the OR circuit when conducting, an internal combustion engine Further provided is a mask switch trigger means for triggering and conducting the mask switch in a region where the rotation speed is equal to or higher than a set value, and the output of the OR circuit is given to the discharge switch as the ignition signal. The ignition device for a capacitor discharge internal combustion engine according to any one of claims 2, 3, 4 and 5. 7. A peak detection circuit for detecting the peak position of the output voltage of the magneto generator in the non-charge section and outputting a peak detection signal, and an OR circuit for inputting the calculated ignition position signal and the peak detection signal. And a masking switch provided so as to bypass the peak detection signal from the OR circuit when conducting, and triggering the masking switch in a region where the rotation speed of the internal combustion engine is equal to or higher than a set value. 5. The ignition device for a capacitor discharge type internal combustion engine according to claim 4, further comprising a mask switch trigger means for electrically connecting the discharge switch with the output of the OR circuit being given to the discharge switch as the ignition signal. 8. A magnet generator that has at least an exciter coil for charging a capacitor on the stator side, generates an AC voltage in synchronization with the rotation of an internal combustion engine, and ignition energy provided on the primary side of the ignition coil. A storage capacitor and a rotation angle section in which the exciter coil generates a positive half-cycle output voltage and a rotation angle section in which a negative half-cycle output voltage is generated are a charging section and a non-charging section of the capacitor, respectively, and the charging section. In the internal combustion engine, a capacitor charging circuit that charges the capacitor by the output voltage of the exciter coil, a discharge switch that conducts when an ignition signal is given, and discharges the electric charge of the capacitor to the primary coil of the ignition coil, A reference signal generation circuit that generates a reference signal at the reference position for starting the measurement of the ignition position,
Ignition position calculation means for calculating the ignition position at each rotation speed of the internal combustion engine, and measurement of the ignition position calculated by the ignition position calculation means when the reference signal is generated is started and measurement of the ignition position is completed. A capacitor discharge type internal combustion engine ignition device, comprising: an arithmetic ignition position signal generating means for generating an arithmetic ignition position signal when applying the ignition signal to the discharge switch when the arithmetic ignition position signal is generated. A reference voltage generation circuit that generates a reference voltage whose level changes with changes in the output voltage and output frequency of the magneto generator in the charging section; and a voltage detection circuit that detects the output voltage of the magneto generator in the non-charging section. , The level of the output voltage of the voltage detection circuit in the process of increasing the level of the output voltage of the magneto generator in the non-charging section toward the peak value The reference signal is generated when it matches the level of the reference voltage, and the output voltage of the voltage detection circuit outputs the reference voltage in the process of the output voltage level of the magneto-generator in the non-charging section decreasing past the peak. Of the reference ignition signal and the fixed ignition position signal generating circuit for generating a fixed ignition position signal when the level of the ignition position signal and the fixed ignition position signal are input. And an OR circuit for giving an ignition signal to the discharge switch, to make the position where the reference signal is generated constant regardless of the peak value and the frequency of the output voltage of the magneto generator in the non-charging section. As described above, the ignition device for a capacitor discharge type internal combustion engine, wherein the rate of change in the level of the reference voltage is adjusted.