JP3412458B2 - Ignition device for internal combustion engine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition device for an internal combustion engine that generates a high ignition voltage for causing spark discharge in an ignition plug at the ignition position of the internal combustion engine.

[0002]

2. Description of the Related Art An internal combustion engine ignition system comprises an ignition signal generating circuit for generating an ignition signal at an ignition position of the internal combustion engine, and an ignition circuit for generating a high voltage for ignition when the ignition signal is generated. . The ignition signal generation circuit obtains the rotation speed information and the rotation angle information from the output of the signal generator attached to the engine, obtains the ignition position at each rotation speed, and generates the ignition signal at the obtained ignition position.

As a signal generator, an inductor type signal having a rotor provided with a reluctor (inductor) consisting of a convex portion or a concave portion and a signal emitting electron for detecting the reluctor of the rotor and generating a signal. Generators are often used. The signal generator used for the inductor type signal generator has an iron core having a magnetic pole portion facing the rotor at its tip, a signal coil wound around the iron core, and a permanent magnet magnetically coupled to the iron core. However, when the reluctor of the rotor begins to face the magnetic pole portion at the tip of the iron core, and when the reluctor finishes facing the magnetic pole portion at the tip of the iron core, changes in the magnetic flux generated in the iron core cause the signal coil to change. A first pulse signal and a second pulse signal having different polarities are induced.

Generally, in this type of signal generator, a first pulse signal is generated at a first rotational angle position where the phase leads the engine top dead center, and the first rotational angle position and the top dead center are generated. The length of the reluctor and the mounting position of the signal emitting electron are set so that the second pulse signal is generated at the second rotation angle position set between and. As described above, since each pulse signal is generated at a specific rotation angle position, it has specific rotation angle position information of the engine, and the pulse signal generation interval has rotation speed information.

The ignition circuit comprises an ignition coil and a primary current control circuit which causes a rapid change in the primary current of the ignition coil when an ignition signal is applied. A high voltage for ignition is generated in the secondary coil of the ignition coil. As the primary current control circuit, a capacitor discharge type circuit that causes a rapid change in the primary current of the ignition coil by discharging the electric charge of the capacitor through the primary coil of the ignition coil when an ignition signal is given, and the ignition coil 2. Description of the Related Art There is known a current interrupting type circuit that causes an abrupt change in the primary current by interrupting the primary current flowing in the primary coil when an ignition signal is given.

[0006]

In an internal combustion engine used for a small displacement scooter or the like, a rotation angle position (crankshaft rotation angle position) obtained by advancing the ignition position by a predetermined angle from top dead center in a low / medium speed range. ), The ignition position is retarded from the medium speed range to the high speed range, and in the range exceeding the set speed (speed limit) of the high speed range, the engine is misfired to limit the running speed. Is required. Further, the ignition device of this type is required to have the cost as low as possible.

In the recent ignition device for an internal combustion engine, when the ignition position is controlled with respect to the rotation speed, a custom IC (an IC custom-made based on a special design) that constitutes a microcomputer or an arithmetic circuit is used. Although the ignition signal generating circuit is often configured by using the ignition signal generating circuit by using an expensive microcomputer or a custom IC, a price commensurate with the ignition device having the relatively simple characteristics as described above can be obtained. There was a problem that it was difficult to reduce the cost.

An object of the present invention is to perform ignition operation at an advanced position in a low and medium speed range without using expensive parts such as a microcomputer and a custom IC, and to operate at a low and medium speed in a range exceeding a set rotational speed. It is an object of the present invention to provide an internal combustion engine ignition device capable of performing an ignition operation at a position retarded from a region.

Another object of the present invention is to cause the ignition operation to be performed at the advanced position in the low / medium speed range, and to be performed at the retarded position from the low / medium speed range in the range exceeding the set rotational speed. An object of the present invention is to provide an internal combustion engine ignition device capable of obtaining a characteristic that causes the engine to misfire in a region exceeding the speed limit.

[0010]

According to the present invention, a first pulse signal is generated at a first rotation angle position in which the phase is advanced from the top dead center of the engine when the internal combustion engine is rotating normally, and the first rotation signal is generated. An inductor-type signal generator that generates a second pulse signal having a polarity different from that of the first pulse signal at a second rotational angular position between the angular position and top dead center; An ignition device for an internal combustion engine, comprising an ignition signal generation circuit for generating an ignition signal for determining an ignition position of an internal combustion engine by inputting a pulse signal of 2 and an ignition circuit for generating a high voltage for ignition when the ignition signal is generated. Related to.

In the present invention, the ignition signal generating circuit performs an integrating operation of charging the first integrating capacitor with the first time constant to generate the first integrating voltage across the first integrating capacitor. A first integration circuit, a first integration capacitor charge stop circuit that interrupts charging of the first integration capacitor while the second pulse signal is generated, and a pulse that is approximately equal to the signal width of the second pulse signal A rectangular wave voltage generating circuit that generates a rectangular wave voltage having a width, and a second integrating capacitor of the second integrating capacitor by performing an integrating operation of charging the second integrating capacitor with a second time constant using the rectangular wave voltage as a power supply voltage. A second integrator circuit that generates a second integrated voltage across both ends;
A reset circuit that almost instantly discharges the electric charge of the first integrating capacitor and the electric charge of the second integrating capacitor when the first pulse signal is generated, and a reference of a level set only while the rectangular wave voltage is being generated. A reference voltage generating circuit for generating a voltage and a first ignition position when the rectangular wave voltage is generated in a state where the first integrated voltage is compared with the reference voltage and the first integrated voltage exceeds the reference voltage. The first ignition position signal generating circuit that generates a signal is compared with the first integrated voltage and the second integrated voltage, and the first integrated voltage is matched with the second integrated voltage at the rotation angle position. A second ignition position signal generating circuit that generates a second ignition position signal using a rectangular wave voltage as a power supply voltage, and an ignition circuit that ignites when either the first ignition position signal or the second ignition position signal is generated. Of the OR circuit configuration that gives the signal Providing a fire signal output circuit.

Further, in the present invention, the first integrated voltage and the second integrated voltage become equal at a position after the second rotational angle position and ahead of the position at which the second pulse signal disappears. Is set to the first time constant and the second time constant, the reference voltage is kept lower than the first integrated voltage when the rotation speed of the internal combustion engine is equal to or lower than the set value, and the rotation speed is set to the set value. The level of the reference voltage is set so that the reference voltage is kept higher than the level of the first integrated voltage while the rectangular wave voltage is generated when the voltage exceeds.

That is, the first position is at a position behind the second rotation angle position and ahead of the position at which the second pulse signal disappears.
Condition that the integrated voltage of is equal to the second integrated voltage, and that the reference voltage is kept lower than the first integrated voltage when the rotation speed of the internal combustion engine is equal to or lower than the set value, the rotation speed is set to the set value. When the first and second times are satisfied, the reference voltage is kept higher than the level of the first integrated voltage while the rectangular wave voltage is generated when Set constant and reference voltage level.

With the above construction, in the low and medium speed region of the engine, the time for charging the first integrating capacitor is sufficiently long, so that the second pulse signal is generated and the first reference voltage is generated. At times, the first integrated voltage is higher than the first reference voltage. Therefore, when the rectangular wave voltage is generated, the first ignition position signal generating circuit generates the first ignition position signal. At this time, since the second ignition position signal has not yet been generated, the ignition signal is given to the ignition circuit when the first ignition position signal is generated.

When the rotational speed of the engine exceeds the set value, the reference voltage exceeds the first integrated voltage, so that the first ignition position signal does not occur. In this state, the second ignition position signal is generated at the rotational angle position where the first integrated voltage and the second integrated voltage are equal to each other, and the second ignition position signal provides the ignition signal to the ignition circuit. Both the time for charging the first integrating capacitor and the time for charging the second integrating capacitor become shorter as the rotation speed of the engine increases, and both the first integrating voltage and the first integrating voltage become Since it decreases at the same rate as the rotation speed increases, the rotation angle position where the first integrated voltage and the second integrated voltage become equal is constant regardless of the rotation speed.

With the above-mentioned configuration, the ignition operation is performed at the advanced position in the low and medium speed range with a simple circuit configuration in which the charge / discharge circuit of the capacitor and the comparison circuit are combined without using a microcomputer or a custom IC. Let
In the region where the rotation speed exceeds the set value, the ignition operation can be performed at the retarded position, and the cost of the ignition device can be reduced.

In the present invention, when it is necessary to prevent the rotational speed of the engine from exceeding the limit value, a reference voltage generating circuit that constantly generates a reference voltage that holds a constant level,
Comparing the first integrated voltage with the reference voltage, allowing the ignition signal to be provided to the ignition circuit from the ignition signal output circuit when the first integrated voltage is higher than the reference voltage;
And a misfire control circuit for inhibiting the ignition signal from being given to the ignition circuit from the ignition signal output circuit when the integrated voltage is lower than the reference voltage.

In this case, when the rotation speed of the internal combustion engine is less than or equal to the speed limit, the first integrated voltage is made higher than the reference voltage at the position where the second ignition position signal is generated, and the rotation speed of the internal combustion engine exceeds the speed limit. In the region, the level of the reference voltage is set so that the first integrated voltage becomes lower than the reference voltage at the position where the second ignition position signal is generated.

As described above, if the misfire control circuit is provided, when the rotational speed of the engine exceeds the speed limit, the first integrated voltage is higher than the reference voltage at the position where the second ignition position signal is generated. Because of the low state, the ignition signal is prevented from being given to the ignition circuit from the ignition signal output circuit, the ignition operation is stopped, and the engine is misfired. This limits the rotational speed of the engine to the speed limit or less.

As described above, if the first integrated voltage used for the calculation of the ignition position is used to determine whether the engine speed exceeds the speed limit, the circuit configuration is simplified. be able to.

[0021]

1 shows an example of the configuration of an internal combustion engine ignition device according to the present invention. In FIG. 1, 1 is an inductor type signal generator mounted on the internal combustion engine, and 2 is a signal generator. An ignition signal generating circuit 3 for generating an ignition signal Vi at an ignition position of an internal combustion engine generates an ignition high voltage Vh when the ignition signal Vi is given, and the ignition plug is attached to a cylinder of the engine. It is an ignition circuit for P.

The signal generator 1 has a reluctor (inductor) composed of a convex portion or a concave portion, and is made of an iron rotor attached to a crankshaft of an engine, and a change in magnetic flux generated by the reluctor of the rotor. Is detected to generate a pulsed signal voltage.

The signal-generating electrons are composed of a magnet-generating iron core having a magnetic pole portion at its tip, and a signal coil 1a wound around the magnet-generating iron core.
And a permanent magnet magnetically coupled to the electronic iron core, the reluctor of the rotor begins to face the magnetic pole portion of the tip of the electronic iron core, and the reluctor is the magnetic pole of the tip of the electronic iron core. When the facing of the unit is completed, the first pulse signal Vs1 and the second pulse signal Vs2 having different polarities are generated in the signal coil 1a.

According to the present invention, when the internal combustion engine is rotating normally, the first rotational angular position θ, which leads the phase of the top dead center of the engine,
The first pulse signal Vs1 is generated at 1, and the polarity is different from that of the first pulse signal Vs1 at the second rotation angle position θ2 set between the first rotation angle position θ2 and the top dead center TDC. Two
The signal generator 1 is configured so as to generate the pulse signal Vs2.

In the present specification, the expression "a pulse signal is generated" means that the pulse signal reaches a level that can be recognized by a circuit.

In this example, as shown in FIG.
The first pulse signal Vs1 and the second pulse signal Vs2 are signals of negative polarity and positive polarity, respectively, and the first pulse signal Vs1 and the second pulse signal Vs2 are respectively first.
Is input to the waveform shaping circuit 4 and the second waveform shaping circuit 5.

As will be described later, the first waveform shaping circuit 4 has the first pulse signal Vs1 at the first rotational angle position θ1 of the engine.
Occurs, a rectangular wave signal Vs1 ′ that is substantially equal to the signal width of the first pulse signal Vs1 is generated, and the second waveform shaping circuit 5 generates the second pulse signal Vs2 when the second pulse signal Vs2 is generated. A rectangular wave signal Vs2 'having a pulse width substantially equal to the signal width of the second pulse signal is generated.

The ignition circuit 3 is a known capacitor discharge type circuit. In this example, one end of the primary coil 301a and one end of the secondary coil 301b are grounded.
And an ignition power supply unit 6 provided on the primary side of the ignition coil.
Of the ignition coil, which is charged to the polarity shown in the figure by the output voltage of the ignition coil, and conducts when the ignition signal Vi is applied to charge the capacitor 302 to the primary coil 301a of the ignition coil.
For discharging through thyristor 303 and diodes 304 connected in antiparallel to both ends of thyristor 303
It has and. In the illustrated example, the ignition capacitor 30
2 is provided on the non-grounded terminal side of the primary coil 301a of the ignition coil and connected in series to the primary coil, and a thyristor 303 is provided at both ends of a series circuit of the primary coil 301a and the ignition capacitor 302, and a cathode thereof is grounded. It is connected with facing side.

The ignition power source unit 6 is an ignition capacitor 302.
A portion for generating a DC voltage for charging the ignition power source section, which includes an exciter coil provided in a magnet generator attached to the engine and a rectifier that rectifies the output of the exciter coil. A DC-DC converter that boosts the output voltage of the battery by a chopper circuit is used. The ignition capacitor 302 is charged to the polarity shown by the output of the ignition power supply unit 6.

In the illustrated ignition circuit 3, when the ignition signal Vi is applied to the discharging thyristor 303, the thyristor 303 becomes conductive. When the thyristor 303 becomes conductive,
Since the electric charge accumulated in the ignition capacitor 302 is discharged through the thyristor 303 and the primary coil 301a of the ignition coil, a large magnetic flux change occurs in the iron core of the ignition coil, and the secondary coil 301b of the ignition coil is ignited. High voltage is induced. Since this ignition high voltage is applied to the ignition plug P, a spark is generated in the ignition plug P and the internal combustion engine is ignited.

The ignition signal generating circuit 2 is the first integrating circuit 2
01, charge stop circuit 202, and rectangular wave voltage generation circuit 2
03, the second integration circuit 204, and the reset circuit 205
A reference voltage generation circuit 206, first and second ignition position generation circuits 207 and 208, and an ignition signal output circuit 20.
9, reference voltage generation circuit 210, misfire control circuit 211
It consists of

The first integrating circuit 201 has a first integrating capacitor C1 whose one end is grounded, a resistor R1 whose one end is connected to the positive terminal of a DC constant voltage power supply circuit (not shown), and the other end of which is connected to the other end of the resistor R1. Diode D1 with anode connected
And a resistor R2 connected between the cathode of the diode D1 and the non-grounded side terminal of the first integrating capacitor C1,
The anode is connected to the non-grounded side terminal of the capacitor C1,
A cathode is provided with a diode D2 connected to a ground circuit through a reset circuit 205, and a constant DC voltage is supplied from a DC constant voltage power supply circuit (not shown) across the series circuit of a resistor R1, a diode D1, a resistor R2 and an integrating capacitor C1. The voltage Vcc is applied.

This first integrator circuit uses a voltage Vcc supplied from a DC constant voltage power supply circuit (not shown) as a power supply voltage and a first integration capacitor C1 through a resistor R1, a diode D1 and a resistor R2 to generate a first time constant. (The first time constant is substantially determined by the resistance values of the resistors R1 and R2 and the electrostatic capacitance of the capacitor C1.) The integral operation of charging is performed and the first integrated voltage Vc1 is applied across the first integrating capacitor C1.
To occur.

The charge stop circuit 202 is the first integration circuit 2
It is provided so as to connect between the anode of the diode D1 of 01 and the output terminal of the second waveform shaping circuit 5,
The charging current supplied from the power supply circuit (not shown) through the resistor R1 during the period when the second pulse signal Vs2 is generated is
Bypassing the integration capacitor C1 of the first integration capacitor C1 to interrupt charging of the first integration capacitor C1.

The rectangular wave voltage generation circuit 203 is a circuit which is controlled by the second waveform shaping circuit 5 to generate a rectangular wave voltage, and which holds a constant level while the second pulse signal Vs2 is generated. A wave voltage (rectangular wave voltage having a pulse width substantially equal to the signal width of the second pulse signal) Vq is generated.

The second integrating circuit 204 has a second integrating capacitor C2 whose one end is grounded, a cathode connected to the non-grounded terminal of the capacitor C2, and an anode connected to the output terminal of the rectangular wave voltage generating circuit 203. Diode D3
And a diode D4 whose anode is connected to the non-ground side terminal of the second integrating capacitor C2 and whose cathode is connected to the ground circuit through the reset circuit 205.
The second integrating circuit 204 uses the rectangular wave voltage Vq as a power supply voltage and sets the second integrating capacitor C2 to a second time constant (the second time constant is determined by the resistance value of the resistor R3 and the capacitance of the capacitor C2). The second integration voltage Vc2 is generated across the second integration capacitor C2 by performing an integration operation of charging with the second integration capacitor C2.

The reset circuit 205, as will be described later,
The switch circuit is made conductive when the first pulse signal Vs1 is generated. When the first pulse signal Vs1 is generated, the charge of the first integrating capacitor C1 and the charge of the second integrating capacitor C2 are almost instantaneously changed. To discharge.

The reference voltage generating circuit 206 is a circuit for generating the reference voltage Vf1 of a set level only while the rectangular wave voltage is being generated. Illustrated reference voltage generation circuit 206
Is a resistance R4 and R4 to which a square wave voltage Vq is applied.
It is composed of a series circuit of 5 (resistive voltage dividing circuit) and divides the rectangular wave voltage Vq to output the reference voltage Vf1 across the resistor R5.

The first ignition position signal generating circuit 207 compares the first integrated voltage Vc1 with the reference voltage Vf1 and generates the rectangular wave voltage Vq in a state where the first integrated voltage Vc1 exceeds the reference voltage Vf1. In the illustrated ignition position signal generation circuit 207, the first integrated voltage Vc1 and the reference voltage Vf1 are input to the non-inverting input terminal and the inverting input terminal, respectively. First comparator CP1
And the output terminal of the comparator CP1 and the rectangular wave voltage generation circuit 2
And a resistor R6 connected between the output terminal and the output terminal of the switch.

The second ignition position signal generating circuit 208
Compares the first integrated voltage Vc1 with the second integrated voltage Vc2, and uses the rectangular wave voltage Vq as the power supply voltage at the rotation angle position where the first integrated voltage Vc1 matches the second integrated voltage Vc2. The ignition position signal generating circuit 208 shown in the figure is a circuit for generating the second ignition position signal Vi2. The first integration voltage Vc1 and the second integration voltage Vc2 are input to the inverting input terminal and the non-inverting input terminal, respectively. 2 comparator CP2 and the comparator CP
The resistor R7 is connected between the output terminal of 2 and the output terminal of the rectangular wave voltage generating circuit Vq.

The ignition signal output circuit 209 comprises an OR circuit which gives the ignition signal Vi to the ignition circuit 3 when either the first ignition position signal Vi1 or the second ignition position signal Vi2 is generated. The illustrated ignition signal output circuit is an output terminal of the first ignition position signal generation circuit 207 (comparator CP1
Output terminal) of which diode is connected to the anode D5
And a diode D6 whose anode is connected to the output terminal of the second ignition position signal generating circuit 208 (output terminal of the comparator CP2) and whose cathode is commonly connected to the cathode of the diode D5. D
The common connection point of the cathodes of 6 is the thyristor 3 of the ignition circuit 3.
It is connected to the gate of 03.

The reference voltage generating circuit 210 comprises a series circuit (resistor voltage dividing circuit) of resistors R8 and R9 to which an output voltage of a DC constant voltage power source circuit (not shown) is applied, and divides the power source voltage to form a resistor R9. A DC reference voltage Vf2 that constantly maintains a constant level is generated at both ends of.

The misfire control circuit 211 is composed of a third comparator CP3 whose output terminal is connected to the gate of the thyristor 303 of the ignition circuit 3. The third comparator CP3 has a non-inverting input terminal and an inverting input terminal, respectively. First integrated voltage V
c1 and the reference voltage Vf2 are input. This misfire control circuit compares the first integrated voltage Vc1 with the reference voltage Vf2,
When the first integrated voltage Vc1 is higher than the reference voltage Vf2, the ignition signal Vi is allowed to be given to the ignition circuit 3 from the ignition signal output circuit 209, and the first integrated voltage Vc1 is higher than the reference voltage Vf2. The ignition signal Vi is prohibited from being supplied to the ignition circuit 3 from the ignition signal output circuit 209 when it becomes low.

The first waveform shaping circuit 4 and the second waveform shaping circuit 4 shown in FIG.
The waveform shaping circuit 5, the charge stop circuit 202, the rectangular wave voltage generation circuit 203, and the reset circuit 205 can be configured as shown in FIG. 2, for example.

The first waveform shaping circuit 4 shown in FIG. 2 has an NPN transistor TR1 whose emitter is grounded, and a resistor R10 connected between the collector of the transistor TR1 and the positive output terminal of a DC power supply circuit (not shown). And a resistor R11 connected between the base of the transistor TR1 and the positive output terminal of the DC power supply circuit, and a diode D10 connected between the base of the transistor TR1 and the ground (emitter) with its anode facing the ground side. And transistor TR1
Resistor R12 and capacitor C, one end of which is connected to the base of
The parallel circuit of 10 and the diode D11 having the anode connected to the other end of the parallel circuit of the resistor R12 and the capacitor C10, the cathode of the diode D11 is the signal coil 1
It is connected to the non-grounded side terminal of a.

In the waveform shaping circuit 4, when the signal coil 1a does not generate the first pulse signal Vs1 having the negative polarity, the base current is applied to the transistor TR1 from the power supply circuit (not shown) through the resistor R11. TR1 is on. At this time, the potential of the collector of the transistor TR1 is kept substantially at the ground potential. When the signal coil 1a generates a first pulse signal Vs1 in the direction of the dashed arrow in the figure and the pulse signal Vs1 exceeds the voltage across the capacitor C10, the signal coil 1a-
The current I1 flows through the path of the diode D10-resistor R12-diode D11-signal coil 1a, and a forward voltage drop occurs across the diode D11. This voltage is the transistor T
Since the base-emitter of R1 is reverse biased, the transistor TR1 is turned off and the potential of its collector becomes high level. Therefore, as shown in FIG. 3B, a rectangular wave signal Vs1 'having a pulse width substantially equal to the signal width of the first pulse signal Vs1 is obtained between the collector of the transistor TR1 and the ground.

The second waveform shaping circuit 5 includes an NPN transistor TR2 whose emitter is grounded, a parallel circuit of a resistor R13 and a capacitor C11 whose one end is connected to the base of the transistor TR2, and a parallel circuit of the resistor R13 and a capacitor C11. Diode D12 whose cathode is connected to the other end of the circuit
The anode of the diode D12 is connected to the non-ground side terminal of the signal coil 1a.

In the second waveform shaping circuit 5, the transistor TR2 is off when the signal coil 1a does not generate the positive second pulse signal Vs2. The signal coil 1a generates the second pulse signal Vs2, and the signal Vs2
When s2 exceeds the voltage across the capacitor C11, a base current flows through the transistor TR2 and the transistor TR2
Turns on. Therefore, as shown in FIG. 3D, a high level state is maintained between the collector and emitter of the transistor TR2 when the second pulse signal Vs2 is not generated, and the second pulse signal Vs2 is generated. A rectangular wave signal Vs2 'that maintains the low level state is obtained only during the operation.

In the charge stop circuit 202, the cathode is connected to the collector of the transistor TR2 and the anode is connected to the anode of the diode D1 in FIG.
By shunting the current supplied from the power supply circuit (not shown) through the resistor R1 from the first integrating capacitor C1 when the second pulse signal Vs2 is generated and the transistor TR2 is turned on. , Interrupt the charging of the first integrating capacitor C1. When the second pulse signal Vs1 disappears and the transistor TR2 is turned off, the charging of the first integrating capacitor C1 is restarted.

The rectangular wave voltage generation circuit 203 includes a PNP transistor TR3 whose emitter is connected to the positive output terminal of a constant voltage DC power supply circuit (not shown), and a transistor TR.
It consists of a resistor R14 connected between the base of the transistor 3 and the collector of the transistor TR2.
The collector of 3 is connected to the connection point of the diode D3 and the resistor R4 and the connection point of the resistors R6 and R7 in FIG.
In this rectangular wave voltage generating circuit 203, the second pulse signal Vs2 is being generated, and the transistor TR3 of the second waveform shaping circuit 5 is in the on state while the transistor TR2 is in the on state. Therefore, the transistor T
Between the collector of R3 and ground, as shown in Fig. 3 (E),
A rectangular wave voltage Vq that maintains a constant level while the second pulse signal Vs2 is generated is obtained.

The reference voltage generating circuit 206 divides the rectangular wave voltage Vq by resistors R4 and R5 to generate a reference voltage Vf1.
(FIG. 3I).

The reset circuit 205 includes an NPN transistor TR4 whose emitter is grounded and a transistor TR4.
Of the transistor TR4 and the collector of the transistor TR1 of the first waveform shaping circuit 4, and a diode D14 having an anode connected to the ground side between the base of the transistor TR1 and the ground. Thus, the collector of the transistor TR4 is connected to the common connection point of the cathodes of the diodes D2 and D4 in FIG.

In this reset circuit, when the first pulse signal Vs1 is generated and the transistor TR1 of the first waveform shaping circuit 4 is turned off, the power supply circuit (not shown) passes through the resistor R10 and the capacitor C12. A pulsed base current is applied to TR4. As a result, the transistor TR4 becomes conductive for a very short time, and the charges of the first and second integrating capacitors C1 and C2 are discharged almost instantly through the diodes D2 and D4 and the transistor TR4 (the first and second integrating circuits are Will be reset).

The voltage Vr in FIG. 3C is the transistor TR.
4 shows the collector-emitter voltage, and the voltage V
r is the transistor T when the first pulse signal Vc1 is generated.
It goes low for a short time when R4 is turned on.

As described above, the first integrating capacitor C1
Is a first time constant from the moment when the transistor TR4 is turned off after being instantly discharged through the transistor TR4 of the reset circuit 205 which is turned on for a short time when the first pulse signal is generated. Be charged.
Then, while the second pulse signal Vs2 is being generated, the charging of the first integrating capacitor C1 is interrupted by the charge stop circuit 202, the second pulse signal Vs2 disappears and the transistor TR2 is turned off. 1 integration capacitor C1
Charging is resumed.

Therefore, as shown in FIGS. 3 (F) and 3 (I), both ends of the first integrating capacitor C1 are located immediately after the generation position (first rotation angle position) of the first pulse signal Vs1. After rising from a position with a constant slope, a constant level is maintained while the second pulse signal is generated, and after the second pulse signal disappears, it rises with a constant slope and charges to the power supply voltage. After that, a first integrated voltage Vc1 having a waveform that returns to zero when the first pulse signal Vs1 is generated is obtained.

The second integrating capacitor C2 is instantaneously discharged through the transistor TR4 of the reset circuit 205 when the first pulse signal is generated, and then the second integration capacitor C2 is generated during the second period during which the second pulse signal Vs2 is generated. It is charged with the time constant of.

Therefore, as shown in FIG. 3F, the second pulse signal Vs1 is applied across the second integrating capacitor C2.
The second integrated voltage Vc2 having a waveform that rises with a constant slope while the voltage is generated is obtained.

In the ignition device shown in FIG. 1, the first integrated voltage Vc1 is delayed by the second integrated angle Vc1 at the position θ3 which is delayed from the second rotational angle position θ2 and advanced from the position at which the second pulse signal Vs2 disappears. Resistances R1 and R are set so as to be equal to the voltage Vc2.
A first time constant determined by the resistance value of 2 and the capacitance of the capacitor C1 and a second time constant determined by the resistance value of the resistor R3 and the capacitance of the capacitor C2 are set.

When the rotational speed N of the internal combustion engine is less than or equal to the set value N1, the reference voltage Vf1 is kept lower than the first integrated voltage Vc1, and when the rotational speed exceeds the set value N1, the rectangular wave voltage is During generation, the reference voltage Vf1 is maintained higher than the level of the first integrated voltage Vc1,
The level of the reference voltage Vf1 is set.

Further, when the rotation speed of the internal combustion engine is less than or equal to the limit speed, the first integrated voltage Vc1 exceeds the reference voltage Vf2 at the position where the second ignition position signal Vi2 is generated, and the rotation speed of the internal combustion engine is limited. The level of the reference voltage Vf2 is set such that the first integrated voltage Vc1 becomes lower than the reference voltage Vf2 at the position where the second ignition position signal is generated when the speed is reached.

FIGS. 3 and 4 show voltage waveforms at various parts of the ignition device of FIG. 1. FIG. 3 shows the case where the rotation speed of the internal combustion engine is equal to or lower than the set value N1, and FIG. 4 shows the rotation speed. Indicates that the value exceeds the set value N1.

When the rotation speed N is less than the set value N1,
Since the charging time of the first integrating capacitor C1 is sufficiently long, the peak value of the first integrating voltage obtained across the capacitor C1 is high. Therefore, as shown in FIG. 3 (I), the first integrated voltage Vc1 always exceeds the reference voltage Vf1, and the output terminal of the first comparator CP1 is as shown in FIG. 3 (J). It is always in a non-grounded state (state in which the potential Vcp1 of the output terminal is not 0). Therefore, when the rectangular wave voltage generating circuit 203 generates a rectangular wave voltage at the second rotational angle position θ2, the first ignition position signal Vi1 is given to the diode D5 of the ignition signal output circuit 209 through the resistor R6. Since the ignition signal Vi is given to the thyristor 303 of the ignition circuit 3 by the first ignition position signal Vi1, the thyristor 303 becomes conductive and the ignition capacitor 3
The electric charge of 02 is discharged through the primary coil 301a of the ignition coil. As a result, the ignition high voltage Vh is generated in the secondary coil 301b of the ignition coil 301, and the engine is ignited.

After the ignition operation is performed at the second rotation angle position θ2, the first integrated voltage is obtained at the rotation angle position θ3 between the second rotation angle position θ2 and the position where the second pulse signal disappears. When Vc1 becomes equal to the second integrated voltage Vc2, the output terminal of the second comparator CP2 becomes non-grounded (the potential Vcp2 of the output terminal of the comparator CP2 is not 0) and the rectangular wave voltage generation circuit 203 The second ignition position signal Vi2 is applied to the diode D6 of the ignition signal output circuit 209 through the resistor R7. At this time, the ignition signal has already been applied to the thyristor 303 of the ignition circuit by the first ignition position signal Vi1. The second ignition position signal Vi2 does not affect the ignition operation.

As the rotation speed of the internal combustion engine increases, the time for charging the first integrating capacitor C1 becomes shorter,
The first integrated voltage Vc1 becomes lower. In the region where the rotation speed N of the internal combustion engine exceeds the set value N1, as shown in FIG. 4 (F), when the signal coil is generating the second pulse signal (the first rotation angle position and the second rotation angle position Since the reference voltage Vf1 exceeds the first integrated voltage Vc1 (in the section between the rotation angle position of the first comparator CP1) and the second pulse signal Vs2 of the first comparator CP1. The output terminal is grounded (the potential Vcp1 of the output terminal is 0).
In this state, the first ignition position signal Vi1 is not generated even if the rectangular wave voltage Vq is generated, and the anode of the diode D5 of the ignition signal output circuit 209 is kept at the ground potential. Next, when the first integrated voltage Vc1 becomes equal to the second integrated voltage Vc2 at the rotation angle position θ3 between the second rotation angle position θ2 and the position where the second pulse signal disappears, FIG. As shown, since the output terminal of the second comparator CP2 is not grounded and the second ignition position signal Vi2 is generated, the second ignition position signal Vi2 is generated.
The ignition position signal Vi2 of the thyristor 30 of the ignition circuit 3
Ignition signal Vi (FIG. 4I) is applied to 3. Therefore, in the region where the engine rotation speed exceeds the set value N1, ignition is performed at the rotation angle position θ3 which is later than the second rotation angle position θ2. First integrated voltage Vc1 and second integrated voltage Vc2
Becomes lower at the same rate as the engine speed increases, so the position θ3 at which both integrated voltages are equal becomes constant.

Therefore, according to the ignition device of FIG. 1, as shown in FIG. 7, in the region where the engine rotation speed N is equal to or lower than the set value N1, the second rotation which is the generation position of the second pulse signal Vs2 is performed. Ignition is performed at the angular position θ2, and the rotation speed N is the set value N.
In the region exceeding 1, the ignition operation is performed at the position θ3 which is delayed from the second rotation angle position. That is, it is possible to obtain an ignition characteristic in which the ignition operation is performed at the advanced ignition position in the low and medium speed range of the engine, and the ignition position is retarded in the middle and high speed range of the engine.

In FIG. 7, BTDC (Before Top D
ead Center) means that the arrow direction of the vertical axis in the figure is the advance direction with respect to the top dead center.

In the ignition device of FIG. 1, when the engine rotates in the reverse direction, the signal coil 1a generates the first pulse signal Vs1 having the negative polarity at the second rotation angle θ2, and the position of the first rotation angle position θ1. Generates a positive second pulse signal Vs2. Therefore, the ignition characteristics when the engine is reversed are shown in FIG.
As shown in. In FIG. 8, θo is a position where the first integrated voltage Vc1 becomes equal to the second integrated voltage Vc2 when the engine rotates in the reverse direction, and is a position further retarded than the first rotational angle position. Further, in FIG. 8, ATDC (After Top Dead)
(center) means that the direction of the arrow shown on the vertical axis of the figure is the retard direction with respect to the top dead center.

As shown in FIG. 8, when the engine rotates in the reverse direction, the ignition position is significantly retarded from the top dead center when the engine runs at a low speed. Therefore, the engine tries to rotate in the reverse direction when the engine starts. Even if force is exerted, the engine can barely produce power and its reversal is not maintained.
Therefore, when the ignition device is configured as shown in FIG. 1, the ignition device can be provided with a function of preventing reverse rotation of the engine.

In the ignition device shown in FIG. 1, when the rotational speed of the engine is equal to or lower than the speed limit N2 set in the high speed region, as shown in FIG. Since the first integrated voltage Vc1 exceeds the reference voltage Vf2 at a position further advanced, the third comparator CP is generated when the second pulse signal Vs2 is generated as shown in FIG. 5C.
The output terminal of 3 is not grounded (the potential Vcp3 of the output terminal of the comparator CP3 is not 0). Therefore, the third comparator CP3 forming the misfire control circuit 211 is connected to the ignition circuit 3
The ignition operation is performed normally without affecting the supply of the ignition signal to the.

On the other hand, the engine speed is limited to the limit value N2.
When it exceeds, the position where the first integrated voltage Vc1 exceeds the reference voltage Vf2 comes to lag behind the position θ3 where the second ignition position signal Vi2 is generated, and the first integrated voltage Vc1 exceeds the reference voltage Vf2. Since the ignition signal is not applied to the ignition circuit 3 until then, the ignition position is delayed, and the increase in the rotational speed of the engine is suppressed. When the rotation speed of the engine further increases, the first integrated voltage Vc1 is kept lower than the reference voltage Vf2 during the period in which the second pulse signal is generated, as shown in FIG. 6B. , The third comparator C while the rectangular wave voltage Vq is generated as shown in FIG. 6 (C).
The state where the output terminal of P3 is grounded (potential Vcp of the output terminal
3 is held at 0). In this state, all the ignition signals output from the ignition signal output circuit 209 are bypassed from the ignition circuit 3 through the output stage of the third comparator CP3, and the ignition signal is not given to the ignition circuit 3.
The ignition operation ceases and the engine is misfired. By these operations, the rotation speed of the engine is limited to the speed limit or less.

In the ignition device of FIG. 1, the ignition power source unit 6
Is constituted by a DC-DC converter that boosts the voltage of the battery and outputs a voltage for charging the capacitor 302, after the thyristor 303 is turned on,
In order to facilitate the commutation to the off state, a circuit is provided to stop the operation of the DC-DC converter while the second pulse signal Vs2 is generated, and the ignition power supply unit 6 to the capacitor 302 and the thyristor 303 are provided. It is desirable that no voltage be applied to the.

In order to ensure commutation of the thyristor 303, DC must be maintained during the generation of the second pulse signal Vs2.
It is desirable to provide a circuit for stopping the operation of the DC converter and a circuit for reducing the signal width of the second ignition position signal Vi2 so as to increase the commutation margin time of the thyristor 303.

FIG. 9 shows the second ignition position signal generating circuit 20.
8 shows an example in which a signal width shortening circuit is provided. In this example, the first integrated voltage Vc1 and the second integrated voltage Vc2 are respectively applied to the non-inverting input terminal and the inverting input terminal of the second comparator CP2. Has been entered. The base of an NPN transistor TR5 is connected to the output terminal of the comparator CP2 via a capacitor C15, and the emitter of the transistor TR5 is grounded. A diode D15 is connected between the base of the transistor TR5 and the ground, with its anode facing the ground side, and a resistor R15 is connected between the base of the transistor TR5 and the positive output terminal of a DC constant voltage power supply circuit (not shown). ing. In addition, the resistor R is connected to the output terminal of the comparator CP2.
The cathode of the diode D16 is connected via 16 and the anode of the diode D16 is connected to the output terminal (collector of the transistor TR3) of the rectangular wave voltage generation circuit 203 shown in FIG. Further, a resistor R17 is connected between the collector of the transistor TR5 and the anode of the diode D16, and the collector of the transistor TR5 serves as the output terminal of the second ignition position signal generating circuit 208 so that the ignition signal output circuit 209 shown in FIG. Connected to the anode of diode D6.

Ignition position signal generation circuit 208 shown in FIG.
, The first integrated voltage Vc1 is equal to the second integrated voltage Vc2
When the output terminal of the comparator CP2 is in a non-grounded state, the base current flows to the transistor TR5 through the resistor R15, so that the transistor TR5 has a higher current level.
5 is conductive, and the potential of the collector of the transistor TR5 is almost at the ground level. In this state, the capacitor C15 is charged with the polarity shown by the output voltage Vq of the rectangular wave voltage generation circuit 103. The second integrated voltage Vc2 becomes equal to the first integrated voltage Vc1 and the comparator C
When the output terminal of P2 is grounded, the electric charge of the capacitor C15 is discharged through the output stage of the comparator CP2 and the diode D15, and at the same time, the current flowing from the power supply circuit (not shown) through the resistor R15 and the comparator C15. It flows through the output stage of CP2. Therefore, the transistor TR5 is in the cut-off state for a short period until the charging of the capacitor C15 in the opposite direction to the illustrated polarity is completed, and the collector of the transistor TR5 has a width as shown in FIG. 10 (B). Narrow pulsed second ignition position signal Vi2
Is obtained.

In the example shown in FIG. 9, the transistor TR5
The capacitor C15, the resistors R15 to R17, and the diodes D15 and D16 constitute a signal width shortening circuit that shortens the signal width of the second ignition position signal Vi2. By providing the signal width shortening circuit in this way, as shown in FIG. 10B, the signal width of the second ignition position signal Vi2 is shortened so that the second pulse signal Vs2 disappears ( Since the ignition signal can be extinguished at a position that is a predetermined angle Δθ before the position at which the ignition power supply unit 6 starts the boosting operation),
The commutation allowance time of the thyristor 303 can be lengthened to ensure the commutation of the thyristor.

[0077]

As described above, according to the present invention, a simple circuit configuration in which a charge / discharge circuit for a capacitor and a comparison circuit are combined is used without using a microcomputer or a custom IC, and it can be used in low and medium speed regions. Since the ignition operation can be performed at the angled position and the ignition operation can be performed at the retarded position in the region where the rotation speed exceeds the set value, there is an advantage that the cost of the ignition device can be reduced.

Further, in the present invention, when the misfire control circuit is provided, the ignition device can be provided with the function of limiting the rotational speed of the engine. In this case, since the first integrated voltage used to calculate the ignition position is used to determine whether the engine speed exceeds the speed limit, the rotation speed can be increased without complicating the circuit configuration. It can have the function of limiting the speed.

[Brief description of drawings]

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

FIG. 2 is a circuit diagram showing a specific configuration example of a portion shown in the block diagram of FIG.

FIG. 3 shows a case where the rotation speed of the internal combustion engine is below a set value.
FIG. 3 is a waveform diagram showing waveforms of signals appearing at various parts of the ignition device of FIG.

FIG. 4 is a waveform diagram showing a waveform of a signal appearing in each part of the ignition device of FIG. 1 when the rotation speed of the internal combustion engine exceeds a set value.

5 is a waveform diagram showing a waveform of a signal appearing in each part of the ignition device of FIG. 1 when the rotation speed of the internal combustion engine is equal to or lower than the speed limit.

FIG. 6 is a waveform diagram showing waveforms of signals appearing at various parts of the ignition device of FIG. 1 when the rotation speed of the internal combustion engine exceeds the speed limit.

FIG. 7 is a diagram showing an ignition characteristic obtained by the ignition device of FIG. 1 when the internal combustion engine is rotating normally.

FIG. 8 is a diagram showing an ignition characteristic obtained by the ignition device of FIG. 1 when the internal combustion engine rotates in the reverse direction.

9 is a circuit diagram showing a modified example of a second ignition position signal generation circuit used in the ignition device of FIG.

10 is a waveform diagram showing signal waveforms at various parts of the circuit of FIG.

[Explanation of symbols]

1 signal generator 2 Ignition signal generation circuit 201 First integrating circuit 202 Charge stop circuit 203 Square wave voltage generation circuit 204 Second integrating circuit 205 reset circuit 206 Reference voltage generation circuit 207 First ignition position signal generation circuit 208 Second ignition position signal generation circuit 209 Ignition signal output circuit 3 ignition circuit 4 First waveform shaping circuit 5 Second waveform shaping circuit 6 Ignition power supply

Continuation of the front page (56) Reference JP 62-271965 (JP, A) JP 61-283765 (JP, A) JP 1-134072 (JP, A) JP 62-228670 (JP , A) JP 62-233478 (JP, A) JP 5-1652 (JP, A) JP 58-148271 (JP, A) Actual development 59-79564 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F02P

Claims (2)

(57) [Claims] 1. A first pulse signal is generated at a first rotation angle position, which has a phase leading from the top dead center of the engine during normal rotation of the internal combustion engine, to generate the first rotation angle position and the top dead center. An inductor-type signal generator that generates a second pulse signal having a polarity different from that of the first pulse signal at a second rotation angle position between the first pulse signal and the second pulse signal. An ignition device for an internal combustion engine, comprising: an ignition signal generation circuit that generates an ignition signal that determines an ignition position of an internal combustion engine as an input; and an ignition circuit that generates a high voltage for ignition when the ignition signal is generated. The signal generating circuit includes a first integrating circuit configured to perform an integrating operation of charging the first integrating capacitor with a first time constant to generate a first integrating voltage across the first integrating capacitor; While the second pulse signal is being generated, the first A charge stop circuit for interrupting the charging of the integration capacitor, a rectangular wave voltage generation circuit for generating a rectangular wave voltage having a pulse width substantially equal to the signal width of the second pulse signal, and the rectangular wave voltage as a power supply voltage. A second integration circuit that generates a second integration voltage across the second integration capacitor by performing an integration operation of charging the second integration capacitor with a second time constant; and the first pulse signal. And a reset circuit that discharges the charge of the first integrating capacitor and the charge of the second integrating capacitor almost instantaneously, and a reference voltage of a set level only while the rectangular wave voltage is being generated. A first reference voltage generating circuit for comparing the first integrated voltage with the reference voltage and generating a first rectangular wave voltage when the first integrated voltage exceeds the reference voltage. A first ignition position signal generating circuit that generates a fire position signal and the first integrated voltage and the second integrated voltage are compared with each other, and a rotation angle at which the first integrated voltage matches the second integrated voltage. A second ignition position signal generating circuit for generating a second ignition position signal by using the rectangular wave voltage as a power supply voltage at a position, and when either the first ignition position signal or the second ignition position signal is generated. An ignition signal output circuit having an OR circuit configuration for giving an ignition signal to the ignition circuit, wherein the ignition signal output circuit is provided at a position delayed from the second rotation angle position and advanced from a position at which the second pulse signal disappears. The first time constant and the second time constant are set so that the integrated voltage of 1 becomes equal to the second integrated voltage, and the reference voltage is set to the first value when the rotation speed of the internal combustion engine is equal to or less than a set value. Holds a state lower than the integrated voltage of The level of the reference voltage is set so that the reference voltage is maintained higher than the level of the first integrated voltage during the generation of the rectangular wave voltage when the frequency exceeds the set value. A characteristic ignition device for an internal combustion engine. 2. A reference voltage generating circuit for generating a reference voltage which always holds a constant level, and a comparison between the first integrated voltage and the reference voltage, wherein the first integrated voltage is higher than the reference voltage. While allowing the ignition signal to be given to the ignition circuit from the ignition signal output circuit, and when the first integrated voltage is lower than the reference voltage, from the ignition signal output circuit to the ignition circuit. A misfire control circuit for prohibiting an ignition signal from being given to the first internal voltage at the position where the second ignition position signal is generated when the rotation speed of the internal combustion engine is equal to or lower than a speed limit. The first integrated voltage is lower than the reference voltage at the position where the second ignition position signal is generated when the rotation speed reaches the speed limit, and the first integrated voltage is lower than the reference voltage. Time constant of 1 An ignition device according to claim 1, characterized in that the level of the reference voltage is set.