JP2894050B2 - 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 which obtains advance characteristics in a predetermined rotation range of the internal combustion engine.

[0002]

2. Description of the Related Art A signal generator (Japanese Utility Model Publication No. 54-29391) which arranges a magnetic detector such as a Hall IC in a magnet generator driven by an internal combustion engine and generates an ignition signal for determining the ignition timing of the internal combustion engine is known. Proposed. In this signal generator, an ignition signal can be obtained only by arranging a small magnetic detector in the magnet generator, so that the magnet generator can be prevented from becoming large. Further, since a reluctor is not required to change the magnetic flux passing through the magnetic detector, a troublesome process for forming the reluctor on the rotor of the magnet generator is not required.

[0003]

When an ignition device for an internal combustion engine is constructed by using a signal generator constructed by arranging a magnetic detector in a magnet generator as described above, the ignition signal has a pulse waveform. Since the ignition timing is determined by the rise, the advance angle characteristics could not be obtained.

[0004] It is an object of the present invention to provide an ignition device for an internal combustion engine which uses a signal generator constructed by arranging a magnetic detector in a magnet generator and which can obtain an advanced angle characteristic. It is in.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an ignition circuit for controlling a primary current of an ignition coil to generate a high voltage for ignition when an ignition signal is given, and for igniting an ignition timing of an internal combustion engine. The present invention relates to an ignition device for an internal combustion engine including an ignition timing control device for giving an ignition signal to a circuit. Claim 1
In the invention described in the above, the ignition timing control device,
A plurality of magnetic detectors arranged in a magnet generator driven by the internal combustion engine to generate a rectangular wave signal having a predetermined phase difference; An advancing width determining pulse generating circuit for generating an advancing width determining pulse only once per ignition cycle; and a low speed ignition which receives the advancing width determining pulse as input and has a constant angular phase delay from the pulse signal A low-speed timing pulse generation circuit that generates a timing pulse, a charging circuit that charges the integration capacitor at a predetermined rate, a reset circuit that instantaneously discharges the integration capacitor when a low-speed ignition timing pulse is generated, and an advance angle determination An integration circuit with a discharge circuit that discharges the integration capacitor at a fixed rate during the period in which the use pulse is generated, and obtained at both ends of the integration capacitor A lead angle control signal generation circuit that compares the divided voltage with a reference voltage and generates a lead angle control signal when the integrated voltage is lower than the reference voltage, and a lead angle control during generation of a lead angle determination pulse An ignition signal generating circuit for generating an ignition signal when a signal is generated or when a low-speed ignition timing pulse is generated.

[0006] In the invention described in claim 2,
The ignition timing control device includes a pulse generation circuit for determining an advance angle width and a timing pulse generation circuit for low speed, a charging circuit for charging an integration capacitor at a predetermined ratio, and an ignition timing pulse for low speed. An integration circuit having a reset circuit that instantaneously discharges the integration capacitor when a fault occurs, and an integration voltage obtained at both ends of the integration capacitor is compared with a reference voltage. When the pulse continues to the position where the pulse for determination is generated, an ignition signal is generated at the position where the pulse for determining the advance width is generated. The ignition signal generating circuit may generate an ignition signal when a low-speed ignition timing pulse is generated.

[0007] One ignition cycle means a cycle from the time when the ignition operation is performed in each cylinder of the internal combustion engine to the time when the next ignition operation is performed. When one ignition is performed per one rotation of the engine, one rotation period of the engine is one ignition cycle period.

[0008]

When the integrating circuit is constructed as in the first aspect of the present invention, both ends of the integrating capacitor are fixed from the position immediately after the low-speed ignition timing pulse is generated to the position where the advanced angle width determining pulse is generated. Is obtained, and an integrated voltage having a waveform rising with a constant gradient while the pulse for determining the advance angle is generated is obtained.

When the rotational speed of the engine is low, the integrated voltage is equal to or higher than the reference voltage until the low-speed ignition timing pulse is generated. No angle control signal is generated. In this state, an ignition signal is generated when the low-speed ignition timing pulse is generated.

Since the peak value of the integrated voltage decreases as the engine speed increases and the charging time of the integration capacitor decreases, the engine speed exceeds the set value (advance start rotation speed). Then, during the generation of the advance width determination pulse, the integrated voltage becomes lower than the reference voltage, and the advance control signal is generated.

Since the position where the integrated voltage becomes lower than the reference voltage advances as the rotational speed increases, the position where the advance angle control signal is generated advances as the rotational speed increases. In this state, since the ignition signal is generated at the position where the advance control signal is generated, the ignition timing advances as the engine speed increases.

A certain value of the engine speed (advance end rotation speed)
When it rises, an ignition signal is generated at the position where the pulse for determining the advance width is generated. In a rotation region equal to or higher than the advance end rotation speed, ignition is performed at the position where the advance width determination pulse is generated.

Therefore, according to the present invention, the ignition position is constant (the position where the low-speed ignition timing pulse is generated) in the low rotation range below the advance start rotation speed, and the advance start rotation speed is reduced to the advance end rotation speed. In the region up to the number, the ignition timing is linearly advanced, and in the region exceeding the advance end rotation speed, the advancement characteristic in which the ignition timing is constant is obtained.

In the case where the integrating circuit is constructed as in the second aspect of the present invention, a constant value is maintained from the position immediately after the low-speed ignition timing pulse is generated to the position where the next low-speed ignition timing pulse is generated. An integrated voltage that rises with a slope is obtained. When the number of revolutions of the engine is less than the set value, the integrated voltage becomes higher than the reference voltage at a position where the phase is advanced from the position where the pulse for determining the advance angle is generated. A signal is generated.

When the rotational speed of the engine reaches the set value, the state in which the integrated voltage is lower than the reference voltage continues to the position where the pulse for determining the advance width is generated. Generates an ignition signal. If the engine speed exceeds the set value, the state in which the integrated voltage is lower than the reference voltage will continue to the position delayed from the position where the advance width determination pulse is generated. Since the ignition signal is generated at the position where the pulse is generated, the ignition timing is fixed at the position where the pulse for determining the advance width is generated.

Therefore, according to the above-mentioned invention, the characteristic that the ignition timing is constant in a region where the engine speed is less than the set value and the ignition timing is advanced in a stepwise manner at the set speed is obtained.

[0017]

FIG. 1 shows the overall structure of an embodiment of the present invention. In FIG. 1, numeral 1 designates a primary current of an ignition coil when an ignition signal is given. An ignition circuit 2 for generating a high voltage for ignition is an ignition timing control device for giving an ignition signal to the ignition circuit 1 at the ignition timing of the internal combustion engine.

An ignition circuit 1 includes an exciter coil 101 provided in a magnet generator driven by an internal combustion engine,
An ignition coil 102; an ignition energy storage capacitor 104 provided on the primary side of the ignition coil, which is charged through a diode 103 by the output of the positive half cycle of the exciter coil 101; A thyristor 105 provided to discharge the primary coil of the ignition coil, and an exciter coil 101
And a resistor 107 connected in parallel between the gate and cathode of the thyristor 105, and a resistor 107 connected in parallel between the gate and cathode of the thyristor 105, and an ignition attached to the cylinder of the internal combustion engine. Spark plug 1 to which the induced voltage of the secondary coil of the coil is applied
08.

In the above ignition circuit, the output of the positive half cycle of the exciter coil 101 is
Is charged to the illustrated polarity. When the ignition signal Vi is given to the gate of the thyristor 105 at the ignition timing of the internal combustion engine,
The thyristor 105 conducts, and discharges the electric charge of the capacitor 5 to the primary coil of the ignition coil. As a result, a large magnetic flux change occurs in the iron core of the ignition coil, and a high voltage for ignition is generated in the secondary coil of the ignition coil. Since this high voltage is applied to the spark plug 108, a spark is generated in the spark plug, and the engine is ignited.

The ignition timing control device 2 includes a plurality of magnetic detectors arranged at predetermined intervals in a rotational direction in a magnet generator driven by an internal combustion engine to generate rectangular wave signals having a predetermined phase difference. Width pulse generating circuit for outputting a pulse for determining the advance width only once per ignition cycle of the internal combustion engine with rectangular wave signals obtained from the detectors 200a and 200b and the plurality of magnetic detectors 200a and 200b as inputs. 201, a low-speed timing pulse generating circuit 202 which receives a lead angle width determining pulse Vp1 as input and generates a low-speed ignition timing pulse Vp2 having a constant angular phase delayed from the pulse, an integrating capacitor 203, A reset circuit 204 for instantaneously discharging the integrating capacitor when the ignition timing pulse Vp2 is generated; A charging circuit for charging the integration capacitor 203 through the circuit 205 and the diode 206,
A discharge circuit 20 comprising a constant current circuit 207 and a switch circuit 208 for discharging the integration capacitor 203 at a constant rate during the generation of the advance angle width determination pulse Vp1.
9 and a reference voltage generating circuit 210 for generating a reference voltage Vr.
A lead angle control signal generating circuit 211 for comparing an integrated voltage Vc obtained at both ends of the integrating capacitor with a reference voltage Vr and generating a lead angle control signal Vs when the integrated voltage Vc is lower than the reference voltage Vr; An ignition signal generation circuit 212 that generates an ignition signal when an advance control signal is generated while the advance width determination pulse Vp1 is generated, or when a low-speed ignition timing pulse Vp2 is generated. I have.

In this example, a charging circuit for charging the integrating capacitor 203 through an integrating capacitor 203, a constant current circuit 205 and a diode 206, and a reset circuit 20
4 and a circuit for discharging the integration capacitor 203 through the constant current circuit 207 and the switch circuit 208, constitute an integration circuit.

The advance width determining pulse generation circuit 201 receives rectangular wave signals obtained from a plurality of magnetic detectors 200a and 200b, and simultaneously outputs a plurality of square wave signals obtained from the magnetic detectors 200a and 200b to a high level. And a pulse signal Vp for inputting the pulse signal Vp, and a pulse Vp1 for determining the advance width and a pulse Vp1 corresponding to an inverted version of the pulse signal Vp. And an inverting amplifying circuit 201b for generating a pulse Vp1 '(a pulse having the same phase and pulse width as the pulse Vp).

Each of the magnetic detectors 200a and 200b is formed of, for example, a Hall IC, and detects a magnetic flux generated from each magnetic pole of the rotor of the magnet generator, and a rectangular wave signal whose level changes each time the polarity of the magnetic flux is inverted. Vq1 and Vq2 are output.

In the present invention, the rectangular wave signals Vq1 and Vq1
The angular interval between the magnetic detectors and the magnetic pole arrangement of the rotor of the magnet generator (magnet rotor) so that the period during which q2 is at the high level or the period at the same time is at the same time occurs only once per ignition cycle. (Pole arc angle and pole interval of each magnetic pole)
Is set.

As an example, FIGS. 5 and 6 show the configuration of a magnet rotor when two magnetic detectors are arranged in an eight-pole magnet generator, and the arrangement of the magnetic detectors. In these figures, reference numeral 21 denotes a flywheel magnet rotor. The flywheel magnet rotor 21 includes a cup-shaped flywheel 22 and four arc-shaped rotors fixed to the inner periphery of a peripheral wall portion 22a of the flywheel. It consists of permanent magnets 23a to 23d. The four magnets 23a to 23d are arranged side by side at equal angular intervals with a relatively narrow gap therebetween, and each magnet is magnetized so as to form two magnetic poles, so that a total of eight magnetic poles are provided. M1 to M8 are configured. The magnetization direction of each magnetization region is the radial direction of the flywheel. In FIG. 5, the regions magnetized to form the N-pole rotor magnetic poles are hatched, and the regions magnetized to form the S-pole rotor magnetic poles are marked by countless black dots. The respective magnetized areas are indicated by the arrows. The blank portion of each magnet indicates a non-magnetized region.

The armature core 24 is a ring-shaped multipole core in which eight salient pole portions 24b1 to 24b8 are protruded from a yoke portion 24a formed in an annular shape. The salient pole portions 24b1 to 24b8 each have a power generating coil. 25a1 to 25a8 are wound.

The first magnetic detectors 200a and 200b are attached to axial ends of pole pieces P (see FIG. 6) provided at the tips of two adjacent salient poles 24b1 and 24b2, respectively. It is opposed to the magnetic pole of the magnet rotor.

In the present embodiment, the magnet rotors are set so that the period in which the outputs of the first and second magnetic detectors 200a and 200b are simultaneously at the low level occurs only once per rotation of the magnet rotor 21. Are set, the pole arc angle of each magnetic pole, and the angle interval between the first and second magnetic detectors. In the illustrated example, the magnetic poles M1, M3,
The polar arc angles (magnetic pole widths) of M5, M6 and M7 are set equal. The polar arc angles of the magnetic poles M2 and M4 are also set equal, but the polar arc angles of these magnetic poles are equal to the magnetic poles M1 and M3.
, M5, M6 and M7 are set smaller than the polar arc angles. The magnetic pole M8 is set smaller than the polar arc angles of the magnetic poles M2 and M4.

In the present embodiment, the magnet rotor 21 is
Rotates clockwise at. The change in the magnetic flux φ1 detected by the first magnetic detector 200a when the magnet rotor 21 rotates is as shown in FIG. 3 (B), and the first magnetic detector 200a A rectangular wave signal V1 as shown in FIG. The change in the magnetic flux φ2 detected by the second magnetic detector 8 is as shown in FIG. 3 (A).
A rectangular wave signal V2 shown in FIG.

The arithmetic circuit 201a is composed of a NOR circuit, and generates a pulse signal Vp as shown in FIG. 3 (E) while the rectangular wave signals V1 and V2 are simultaneously at the low level. In the present embodiment, the generation position θ1 of the pulse signal Vp
Is set to be equal to the maximum advance position of the engine, and the signal width of the pulse signal Vp is set to be equal to the advance angle width.

The inverting amplifier circuit 201b outputs the pulse signal Vp
Are generated, and a pulse Vp1 '(a pulse having the same phase and the same waveform as the pulse Vp) is generated by inverting the pulse Vp1 (FIG. 3F).

Low-speed timing pulse generating circuit 202
Generates a low-speed ignition timing pulse Vp2 whose phase is later than that of the advance width determination pulse Vp1. In this embodiment, as shown in FIG. 3 (G), the lead angle determining pulse Vp1
The ignition timing pulse Vp2 for low-speed operation is generated at the disappearance position θ2.

The integration capacitor 203 is charged at a constant current from a DC power supply (not shown) through a constant current circuit 205 and a diode 206. Since the switch circuit 208 conducts during the period in which the lead angle determining pulse Vp1 is generated, the charge of the integration capacitor 203 is discharged at a constant current through the constant current circuit 207 and the switch circuit 208. When the low-speed ignition timing pulse Vp2 is generated, the reset circuit 204 instantaneously discharges the charge of the integrating capacitor 203. When the low-speed ignition timing pulse Vp2 is extinguished, the reset circuit 204 stops operating, and thus the charging of the integration capacitor 203 is restarted. Therefore, at both ends of the integration capacitor 203, as shown in FIG. 3 (H), after the low-speed ignition timing pulse Vp2 rises at a constant slope from the position where it disappeared, the advance angle determination pulse Vp1 is generated. An integrated voltage Vc having a waveform that falls at a constant gradient for a certain period and returns to zero when the low-speed ignition timing pulse Vp2 is generated is obtained.

The integral voltage Vc is input to the advance control signal generation circuit 211 together with the reference voltage Vr. The advance angle control signal generation circuit 211 is composed of a voltage comparator, and generates a low level output when the integrated voltage Vc is equal to or higher than the reference voltage Vr, and outputs a high level output when the integrated voltage Vc becomes lower than the reference voltage Vr. Is output as the lead angle control signal Vs (FIG. 3I).

The ignition signal generating circuit 212 includes a diode D
1 and D2. One of the input terminals 212a has a pulse Vp1 'and an advance control signal Vs
, And the low-speed ignition timing signal Vp2 is input to the other input terminal 212b. The potential of one input terminal 212a of the ignition signal generation circuit 212 is a pulse V
It goes high when the AND condition between p1 'and the advance control signal Vs is satisfied. That is, if the advancing control signal Vs is generated while the advancing width determining pulse Vp1 is being generated, the potential of one input terminal 212a of the ignition signal generating circuit 212 becomes high level, so that the advancing control signal Vs Is generated, the ignition signal Vi is output from the ignition signal generation circuit 212.

When the advance control signal Vs is not generated while the advance width determination pulse Vp1 is generated, the ignition signal Vi is generated when the low-speed ignition timing pulse Vp2 is generated.
Is output.

When the engine speed N is low, FIG.
As shown in (I), the ignition timing pulse for low speed V
Until the generation of p2, the integrated voltage Vc is equal to or higher than the reference voltage Vr, so that the advanced control signal Vs is not generated while the advanced width determination pulse Vp1 is generated. In this state, the ignition signal Vi is generated when the low-speed ignition timing pulse Vp2 is generated at the position of the angle θ2.

Since the peak value of the integrated voltage Vc decreases as the engine speed increases and the charging time of the integrating capacitor decreases, the engine speed exceeds the set value (advance start rotation speed). , The integrated voltage Vc becomes lower than the reference voltage Vr while the advance width determination pulse Vp1 is being generated, and the advance control signal Vs is generated.

Since the position where the integrated voltage becomes lower than the reference voltage advances as the rotational speed increases, the advance control signal V
The position θ3 where s occurs (see FIG. 3I) advances with an increase in the rotational speed. In this state, since the ignition signal Vi is generated at the position where the advance control signal Vs is generated, the ignition timing advances as the engine speed increases.

A certain value of the engine speed (advance end rotation speed)
Rises to the position θ at which the advance width determination pulse Vp1 is generated.
1 causes the ignition signal to be generated. In a rotation region equal to or higher than the advance end rotation speed, ignition is performed at the generation position θ1 of the advance angle width determination pulse Vp1.

Therefore, according to the above-described embodiment, as shown in FIG. 4, the ignition position is constant (the low-speed ignition timing pulse generation position θ2) in the low rotation speed region below the advance start rotation speed N1. The ignition timing is linearly advanced in the range from the advance start rotation speed N1 to the advance end rotation speed N2, and the ignition timing is constant (= θ) in the range beyond the advance end rotation speed N2.
The lead angle characteristic of 1) is obtained.

FIG. 2 shows an embodiment in which each part of FIG. 1 is made more specific. In this embodiment, the arithmetic circuit 201a constituting the advance angle width determining pulse generation circuit 201 includes a NOR circuit.
The inverting amplifier circuit 201b includes transistors TR1 and TR2 and resistors R1 to R4. When the outputs of the magnetic detectors 200a and 200b go low at the same time, the NOR circuit generates a high-level pulse Vp. While the pulse Vp is being generated, the transistor TR
1 conducts, and a pulse Vp1 for determining the advance angle (inverted pulse of the pulse Vp) as shown in FIG. Since the transistor TR1 is turned off while the transistor TR1 is turned on, an inverted pulse Vp1 'of the pulse Vp1 is obtained at the collector of the transistor TR1.

Low-speed timing pulse generating circuit 202
Is composed of a monostable multivibrator composed of capacitors C1 and C2, resistors R5 and R6, and NAND circuits ND1 and ND2, and is triggered by the leading edge of an advance width determination pulse Vp1 as shown in FIG. A low-speed ignition timing pulse Vp2 having a constant time width is output.

The reset circuit 204 has a thyristor Th1
And the resistors R8 and R9. When the low-speed ignition timing pulse Vp2 is generated, the thyristor Th1 is turned on to discharge the integrating capacitor 203.

The constant current circuit 205 is composed of a field effect transistor FET1 and a variable resistor VR1. The integrating capacitor 203 is charged at a constant current from a DC power supply (not shown) through the FET1, the variable resistor VR1 and the diode 206. It has become. The magnitude of the charging current can be adjusted by the variable resistor VR1.

The constant current circuit 207 comprises a field effect transistor FET2 and a variable resistor VR2, and the switch circuit 208 comprises a transistor TR3 and resistors R10 and R1.
It consists of one. When the lead angle determining pulse Vp1 is generated, the transistor TR3 conducts, so that the electric charge of the integrating capacitor 203 is discharged at a constant current through the FET2, the variable resistor VR2 and the transistor TR3. The magnitude of the discharge current can be adjusted by the variable resistor VR2. By adjusting the resistance values of the variable resistors VR1 and VR2, the advance start rotation speed and the advance end rotation speed can be adjusted.

The reference voltage generation circuit 210 includes a resistor R12 and a Zener diode ZD1, and outputs a reference voltage Vr across the Zener diode ZD. The overall operation of the specific embodiment shown in FIG. 2 is similar to the operation already described with reference to FIG.

FIG. 7 shows an embodiment of the second aspect of the present invention. In this embodiment, the constant current circuit 207 and the switch circuit 208 constituting the discharge circuit are omitted from the integration circuit of FIG. I have. The integrated voltage Vc obtained at both ends of the integrating capacitor 203 is applied to the base of the transistor TR4 through the Zener diode ZD2. The emitter of the transistor TR4 is grounded, and the collector is connected to the anode of the diode D1. Diode D1
Is connected to the cathode of a diode D2, and the anode of the diode D2 is supplied with a low-speed ignition timing pulse Vp2. Diodes D1 and D2, transistor TR4, and zener diode ZD2 for providing a reference voltage constitute ignition signal generating circuit 212 '. Other points are the same as those in the example shown in FIG.

In the embodiment shown in FIG.
5 and the integrating capacitor 203 through the diode 206
Is charged at constant current, and the ignition timing pulse Vp2 for low speed
Occurs, the thyristor Th1 conducts, and the charge of the integrating capacitor 203 is discharged. Therefore, at both ends of the integrating capacitor 203, as shown in FIG. 8D, the ignition timing pulse Vp2 for low speed rises at a constant gradient immediately after the generation of the ignition timing pulse Vp2 for low speed, and the next ignition timing pulse Vp2 for low speed occurs. An integrated voltage Vc having a waveform that returns to zero when it occurs is obtained.

When the rotation speed of the engine is less than the set value, the integrated voltage Vc becomes higher than the Zener voltage Vz (reference voltage) of the Zener diode ZD2 at a position where the phase is advanced from the generation position θ1 of the advance angle width determination pulse Vp1. As a result, the transistor TR4 is turned on, so that the ignition signal Vi is generated by the pulse Vp1 '.
Is not given. In this state, the ignition signal Vi is given when the low-speed ignition timing pulse Vp2 is generated at the position of the angle θ2.

When the engine speed reaches the set value, the integrated voltage Vc is lower than the Zener voltage of the Zener diode ZD2 (the transistor TR4 is turned off).
Continue to the position where the advance width determining pulse Vp1 is generated, the ignition signal Vi is given by the pulse Vp1 'at the generation position θ1 of the advance width determining pulse Vp1.

When the engine speed exceeds the set value, the state in which the integrated voltage is lower than the Zener voltage of the Zener diode ZD2 (the state in which the transistor TR4 is shut off) is later than the generation position θ1 of the advance width determination pulse. However, in this state, the ignition signal Vi is generated at the position where the pulse width determining pulse Vp1 is generated, and thus the ignition timing is fixed at the position where the pulse width determining pulse is generated.

Therefore, according to the embodiment of FIG. 7, as shown in FIG. 9, the ignition timing .theta.i is fixed (= .theta.2) in a region where the engine speed is less than the set value N1, and the step is performed at the set speed N1. Thus, the characteristic that the ignition timing is advanced is obtained.

FIGS. 10 and 11 show examples of the configuration of a DC power supply circuit that can be used in each of the above embodiments. In the example shown in FIG. 10, a capacitor C3 is connected to both ends of the exciter coil 101 shown in FIG. 1 via a diode D3 and a resistor R3, and a Zener diode ZD3 is connected in parallel to both ends of the capacitor C3. In this example, the capacitor C3 is charged through the diode D3 and the resistor R13 by the induced voltage of the positive half cycle of the exciter coil 101. Since the charging voltage of the capacitor C3 is limited by the Zener voltage of the Zener diode ZD3, a substantially constant DC voltage is obtained across the capacitor C3. This DC voltage corresponds to FIG. 1, FIG. 2 or FIG.
Is applied to the DC power supply terminal of each circuit shown in FIG.

The DC power supply circuit shown in FIG. 11 has a diode D4 having an anode connected to one end of the exciter coil 101 and the ground, and an anode connected to the other end of the exciter coil 101 and the ground. A thyristor Th2 having a cathode connected to the ground side at both ends of the diode D5, and a thyristor Th2 connected to both ends of the diode D5.
It comprises a capacitor 5 connected to both ends of the diode D5 through a diode D6, a Zener diode ZD4 and a resistor R14 connected between the anode and the gate of the thyristor Th2 and between the gate and the cathode, respectively.

In the DC power supply circuit shown in FIG. 11, the capacitor C5 is charged through the diode D6 by the induced voltage of the negative half cycle of the exciter coil 101.
When the charging voltage of the capacitor C5 reaches the set value, the Zener diode ZD4 conducts and triggers the thyristor Th2, so that the thyristor Th2 conducts and bypasses the charging current of the capacitor C5 from the capacitor. Therefore, the voltage across the capacitor C5 is limited to a set value or less, and a substantially constant DC voltage is obtained across the capacitor C5. This DC voltage is applied to the DC power supply terminal of each circuit of each of the above embodiments.

In the above embodiment, the case where the ignition circuit of the capacitor discharge type is used is taken as an example. However, the high voltage induced in the power supply coil is further ignited by interrupting the current flowing in the power supply coil. A current interruption type ignition circuit configured to obtain a high voltage for ignition by boosting by a coil or a high voltage for ignition by interrupting a current flowing from a battery to a primary coil of an ignition coil. The present invention can be applied to a case where a current interruption type ignition circuit is used.

[0058]

As described above, according to the present invention, a magnetic detector is arranged in a magnet generator to provide one magnet per ignition cycle.
It is possible to obtain a characteristic in which the ignition timing is linearly advanced in a predetermined rotation region or a characteristic in which the ignition timing is advanced in a stepped manner at a set rotation speed, by using a signal generator configured to obtain a pulse signal of two times. it can. Therefore, it is possible to obtain an ignition device for an internal combustion engine that obtains a predetermined advancement characteristic by utilizing a feature of a signal generator using a magnetic detector that it is not necessary to increase the size of a magnet generator.

[Brief description of the drawings]

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

FIG. 2 is a circuit diagram showing an embodiment in which each part of FIG. 1 is made concrete;

FIGS. 3A to 3I are waveform diagrams showing a waveform of a magnetic flux detected by a magnetic detector and a signal waveform of each part in the embodiment of FIGS. 1 and 2;

FIG. 4 is a diagram showing advance angle characteristics obtained by the embodiment of FIG. 1;

FIG. 5 is a configuration diagram showing a configuration of a signal generation device used in an embodiment of the present invention.

FIG. 6 is a sectional view taken along line OA of FIG. 5;

FIG. 7 is a circuit diagram showing a main part of another embodiment of the present invention.

8 (A) to 8 (D) are waveform diagrams showing signal waveforms of respective parts in FIG. 7;

FIG. 9 is a diagram showing advance angle characteristics obtained by the embodiment of FIG. 7;

FIG. 10 is a circuit diagram showing an example of a DC power supply circuit that can be used in an embodiment of the present invention.

FIG. 11 is a circuit diagram showing another example of a DC power supply circuit that can be used in an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ignition circuit, 2 ... Ignition magnetic control circuit, 200a, 20
0b: magnetic detector, 201: pulse generation circuit for determining the advance angle width, 202: timing pulse generation circuit for low speed, 20
3 integration capacitor, 204 reset circuit, 205
Constant current circuit for integrating capacitor charging, 206 ... diode, 207 ... constant current circuit for integrating capacitor discharging, 20
9: discharge circuit, 210: reference voltage generation circuit, 211: advance angle control signal generation circuit, 212: ignition signal generation circuit, TR
4 ... transistor, ZD2 ... Zener diode.

Claims (2)

(57) [Claims] An ignition circuit for controlling a primary current of an ignition coil to generate a high voltage for ignition when an ignition signal is applied, and an ignition for applying an ignition signal to the ignition circuit at an ignition timing of an internal combustion engine. An ignition device for an internal combustion engine comprising a timing control device, wherein the ignition timing control device is disposed in a magnet generator driven by the internal combustion engine and generates a plurality of magnetic detection signals that generate a rectangular wave signal having a predetermined phase difference. An advancing width determination pulse generating circuit that outputs an advancing width determination pulse only once per ignition cycle of an internal combustion engine, using a rectangular wave signal obtained from the plurality of magnetic detectors as an input; A low-speed timing pulse generating circuit that receives a width-determining pulse as input and generates a low-speed ignition timing pulse having a fixed angular phase delayed from the advancing width determining pulse; A charging circuit that charges at a predetermined rate, a reset circuit that instantaneously discharges the integration capacitor when the low-speed ignition timing pulse is generated, and the integration capacitor during a period in which the advance width determination pulse is generated. An integration circuit having a discharge circuit for discharging at a fixed rate; and comparing an integrated voltage obtained at both ends of the integration capacitor with a reference voltage, generating an advance control signal when the integrated voltage is lower than the reference voltage. An advanced angle control signal generation circuit that generates the advanced signal when the advanced angle control signal is generated while the advanced angle width determination pulse is generated, or when the low speed ignition timing pulse is generated. An ignition signal generating circuit for generating the ignition signal. 2. An ignition circuit for generating a high voltage for ignition by controlling a primary current of an ignition coil when an ignition signal is given, and an ignition for giving an ignition signal to the ignition circuit at an ignition timing of an internal combustion engine. An ignition device for an internal combustion engine comprising a timing control device, wherein the ignition timing control device is disposed in a magnet generator driven by the internal combustion engine and generates a plurality of magnetic detection signals that generate a rectangular wave signal having a predetermined phase difference. An advancing width determining pulse generating circuit for generating an advancing width determining pulse only once per ignition cycle of an internal combustion engine by using a rectangular wave signal obtained from the plurality of magnetic detectors as an input; A low-speed timing pulse generating circuit for generating a low-speed ignition timing pulse having a fixed angular phase delayed from the pulse signal for a pulse for determining a width; An integration circuit comprising a charging circuit for charging the battery together, a reset circuit for instantaneously discharging the integration capacitor when the low-speed ignition timing pulse is generated, and a reference voltage obtained by integrating the voltage obtained at both ends of the integration capacitor. When the state in which the integrated voltage is lower than the reference voltage as compared with continues to the position of generation of the advance width determination pulse, the ignition signal is generated at the generation position of the advance width determination pulse,
An ignition signal generation circuit for generating the ignition signal when a low-speed ignition timing pulse is generated when the integrated voltage becomes equal to or higher than the reference voltage at a position where the phase is advanced from the generation position of the advance angle width determination pulse. An ignition device for an internal combustion engine, comprising: