JPH099595A - Signal generator for internal-combustion engine ignition device - Google Patents

Abstract

PURPOSE: To provide a signal generator for an internal-combustion engine ignition device which reduces an error signal voltage induced by vibrations and the malfunction of an ignition device can be prevented. CONSTITUTION: This signal generator is constituted of a rotor 11 which has a recessed region 11a and a projection region 11b in its outer circumference and edge parts 11c, 11d at the boundary between the recessed region and the projection region and a signal generating element 12. The shape of the circumferential surface of the protection region 11b is set so that a distance R between the circumferential surface of the projection region 11b of the rotor 11 and the center of the rotor is maximized in the edge parts 11c, 11d and gradually shortened toward the central part side in the circumferential direction of the projection region 11b from the edge parts 11c, 11d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal generating device for an internal combustion engine ignition device, which generates an ignition signal from a signal emitting electron according to a change in magnetic flux generated by a rotor.

[0002]

2. Description of the Related Art An ignition system for an internal combustion engine generally has a semiconductor switch for controlling a primary current on a primary side of an ignition coil, and the primary current of the ignition coil is supplied by breaking or conducting the semiconductor switch. A sudden change is made to induce a high voltage for ignition in the secondary coil of the ignition coil. In order to determine the ignition position, a signal generator is attached to the internal combustion engine, and a signal obtained from the signal generator is used as an ignition signal to turn on or off the semiconductor switch.

Various types of signal generators have been put into practical use. As one of them, a concave region and a convex region are provided on the outer periphery of a rotating body attached to the rotary shaft of an internal combustion engine to form the concave region and the convex region. A rotor having an edge portion formed at the boundary with the partial area and a magnetic pole portion facing the outer peripheral surface of the rotor with an air gap therebetween, and a signal voltage is generated by a magnetic flux change caused by the rotation of the rotor. Those having a signal emitting electron to induce are widely used.

FIG. 5 shows an example of an ignition circuit for a two-cylinder internal combustion engine using this type of signal generator. In this ignition circuit, an exciter coil EX provided in a magnet generator rotating synchronously with the engine is used. The output charges the ignition energy storage capacitor C through the rectifier D, and the signal voltage generated from the signal generator 12 at the ignition position of the engine is converted into the double-wave rectification circuit R.
Through E, it is given as an ignition signal to a thyristor TH as a primary current control semiconductor switch.
When an ignition signal is applied to the thyristor TH, the thyristor TH is turned on to discharge the electric charge of the ignition energy storage capacitor C through the primary coil L1 of the ignition coil. Due to this discharge, a high voltage is induced in the secondary coil L2 of the ignition coil, this high voltage is applied to the pair of spark plugs P, P, and sparks fly to both spark plugs at the same time. As a result, of the two cylinders to which the spark plugs P, P are respectively attached, the cylinder on the compression stroke side of the engine is ignited.

The signal generator used in this kind of ignition device is often incorporated in a magnet generator provided with an exciter coil EX. 6 and 7 show the configuration of a conventional signal generator incorporated in a magnet generator. The signal generator is a rotor 11 constructed by using a boss portion 5 of a flywheel magnet rotor. , A signal emitting electron 12, and an electron emitting holder 1 made of a magnetic material for attaching the signal emitting electron to a crankcase or the like of an internal combustion engine.
3.

The rotor 11 has a concave region 11a and a convex region 11b arranged in the circumferential direction of a boss made of a magnetic material such as iron.
And edge portions 11c and 11d are formed at the boundary between the concave region 11a and the convex region 11b. The rotor 11 of this example is used when an ignition signal is supplied to an ignition device that ignites a two-cylinder internal combustion engine, and the concave region 11a and the convex region 11b of the rotor 11 each have a circumferential angle of 180 degrees. Formed over the area,
The edge portions 11c and 11d are formed at 180-degree symmetrical positions.

In the conventional signal generator, the rotor 1
The outer peripheral surface of the concave region 11a of No. 1 is formed in the shape of a cylindrical surface having a radius R0 that shares the central axis O with the boss portion 5 as a rotating body, and the outer peripheral surface of the convex region 11b is the same as that of the boss portion 5. It is formed in the shape of a cylindrical surface having a radius R1 (R1> R0) sharing the central axis O.

The signal-generating electrons 12 are generated in the convex region 11 of the rotor.
An iron core 14 having, at one end, a magnetic pole portion 14a facing the outer peripheral surface of b via an air gap 19 having a gap length G1 and one magnetic pole (N pole in this example) magnetically coupled to the other end of the iron core. The magnet 15, the signal coil 16 wound around the iron core 14, and the electron-generating holder 13 made of an iron plate. The electronic holder 13 has a plate-shaped base 13a,
It has a yoke portion 13b standing upright from the center of the base portion 13a, and one end of the yoke portion 13b is magnetically coupled to the other magnetic pole (S pole in this example) of the permanent magnet 15. Case 1 in which the iron core 14 around which the signal coil 16 is wound, the magnet 15, and the yoke portion 13b of the electronic holder 13 are made of resin.
7 is housed, a resin 18 is cast in the case 17, and the part housed in the case is fixed by molding with the casting resin. Mounting holes 13c and 13c are provided at both ends of the base portion 13a of the electronic generating holder 13, and the signal generating device 12 is fixed to a crankcase or the like of an engine (not shown) by a screw penetrating these mounting holes.

In the above signal generator, it is assumed that the boss portion 5 rotates in the direction of the arrow CCW shown, and the magnetic pole portion of the signal generator 12 is in the section where the rotation angle position θ is in the range of θ = 0 ° to 180 °. 14a is in a state of facing the outer peripheral surface of the convex portion area 11b of the rotor, and the magnetic pole portion 14a is in a state of facing the outer peripheral surface of the concave portion area 11a of the rotor 11 in the section of θ = 180 ° to 360 °. In this case, the air gap length between the magnetic pole portion 14a of the signal generating electron and the outer peripheral surface of the rotor 11 is θ =, as shown by the solid line in FIG.
The constant value G1 in the section of 0 ° to 180 °, θ = 180
Constant value G0 = [= G1 + (R1
-R0)]. The magnitude of the magnetic flux of the signal emitting electrons 12 passing through the iron core 14 suddenly increases as the air gap length between the magnetic pole portion 14a and the outer peripheral surface of the rotor 11 decreases, and generally the curve shown by the solid line in FIG. Changes non-linearly. FIG. 8 (B) shows the relationship between the rotational angle position θ of the rotor 11 and the magnetic flux passing through the iron core 14. The magnetic flux flowing through the iron core in the section of θ = 0 ° to 180 ° corresponding to the air gap length. Shows an almost constant value φ 1. θ = 0 ° and 180 °
When the rotor edge portions 11c and 11d respectively pass through the magnetic pole portion 14a at the rotational angle position of, the magnetic flux flowing through the iron core changes abruptly between φ1 and φ0, and due to this abrupt change of the magnetic flux, the signal coil of the signal generator is generated. Signal voltages Vs1 and Vs2 having different polarities are induced in 16. These signal voltages are shown in FIG.
As shown in (C), it occurs at angular positions of θ = 0 ° and 180 °. In the ignition device shown in FIG. 5, these signal voltages Vs1 and Vs2 are given as ignition signals to the primary current controlling semiconductor switch TH of the ignition circuit through the double wave rectifying circuit RE.

[0010]

In the rotor used in the above-mentioned conventional signal generator, the outer peripheral surface of the convex region 11b is formed in the shape of a cylindrical surface sharing the central axis with the rotor provided with the rotor. Therefore, the air gap length between the outer peripheral surface of the convex region 11b and the magnetic pole portion 14a of the signal generating electron 12 is normally constant over the entire convex region 11b during rotation of the engine. Therefore, the signal voltage is induced in the signal emitting electrons only when the edges 11c and 11d formed at the boundary between the concave region 11a and the convex region 11b of the rotor 11 pass through the magnetic pole portion 14a of the signal emitting electron.

However, when the rotating shaft of the engine equipped with the rotor provided with the rotor vibrates in the direction perpendicular to the central axis of the rotating shaft due to the resonance phenomenon occurring during the operation of the engine, the convex portion of the rotor is thereby generated. The air gap length between the outer peripheral surface of the region 11b and the magnetic pole portion 14a of the signal emitting electron fluctuates, for example, as indicated by the broken line in FIG.
The air gap length G1 in the normal state between the magnetic pole portion 14a of the signal emitting electron and the outer peripheral surface of the convex portion area 11b of the rotor is set to a relatively small value, as shown in FIG. As shown in (A), when the air gap length fluctuates between G1a and G1b centering on G1 due to vibration, the magnetic flux passing through the iron core 14 of the signal-generating electron is between φ1a and φ1b centering on the magnetic flux φ1. Fluctuates greatly with (Fig. 8
(B) The waveform of the broken line and FIG. 9). Due to the change in magnetic flux due to this vibration, the signal coil 16 of the signal generator 12 is moved to the signal coil 16 shown in FIG.
A relatively large abnormal signal voltage Vse having a waveform shown by a broken line in (C) is induced. When such an abnormal signal voltage occurs, the primary current control semiconductor switch of the ignition circuit is triggered to cause abnormal ignition in the engine at a position other than the normal ignition position, or high ignition voltage generated at the normal ignition position. There was a problem that it decreased.

An object of the present invention is to provide an abnormal signal generated when the gap length between the outer peripheral surface of the convex portion area of the rotor and the magnetic pole portion of the signal generator fluctuates due to lateral vibration of the rotating shaft during operation of the engine. An object of the present invention is to provide a signal generator for an internal combustion engine ignition device, which can reduce the magnitude of the voltage to prevent abnormal ignition of the engine and adverse effects on the ignition voltage at the normal ignition position.

[0013]

According to the present invention, a concave region and a convex region are provided on the outer periphery of a rotating body attached to a rotary shaft of an internal combustion engine, the concave region and the convex region being arranged in the circumferential direction. An electric signal is generated by detecting a change in magnetic flux caused by an edge portion of the rotor, which has a rotor having an edge portion formed at a boundary portion and a magnetic pole portion facing the outer circumference of the rotor through an air gap. The present invention relates to a signal generator for an internal combustion engine ignition device, which includes a signal generator.

In the present invention, the distance between the outer peripheral surface of the convex region and the center of the rotating body has a maximum value at the edge portion, and the convex portion is gradually reduced as the distance from the edge portion increases. The shape of the outer peripheral surface of the region was set.

In the present invention, the outer peripheral surface of the recessed area is formed in the shape of a cylindrical surface sharing the central axis with the rotating body, and the outer peripheral surface of the protruding area passes through the central portion in the circumferential direction of the rotating body. Can be formed in a cylindrical surface shape having a central axis at a position eccentric to the opposite side of the central axis of the rotating body from the central axis of the rotating body along a straight line extending in the radial direction.

When a cup-shaped flywheel attached to the rotary shaft of an internal combustion engine is used as the rotating body, the convex region and the concave region are formed on the outer circumference of the peripheral wall of the flywheel, and the flywheel is formed. A rotor is constituted by the peripheral wall portion of.

When the boss portion of the flywheel attached to the rotator of the internal combustion engine is used as the rotating body, the convex region and the concave region are formed on the outer periphery of the boss portion, and the boss portion of the flywheel is formed. The above constitutes the rotor.

As the above-mentioned electrons, one having an iron core having a magnetic pole portion at its tip, a permanent magnet magnetically coupled to the iron core, and a signal coil wound around the iron core can be used.

[0019]

As in the present invention, the distance between the outer peripheral surface of the convex region on the outer periphery of the rotating body and the center of the rotating body becomes maximum at the edge portion, and gradually decreases as the distance from the edge portion increases. When the shape of the outer peripheral surface of the convex area is set, the gap length between the magnetic pole portion of the signal emitting electron and the outer peripheral surface of the convex area of the rotor becomes minimum at the edge portion, and gradually increases as the distance from the edge portion increases. It will become. Therefore, when the rotor rotates and the edge portion passes through the magnetic pole portion of the signal generating electron, a large magnetic flux change occurs in the signal generating electron as in the case of the conventional signal generating device, and a normal signal voltage is applied to the signal coil. Occurs.

Further, while the engine is rotating, when the magnetic pole portion of the signal generating electron is opposed to the intermediate position of the convex portion area of the rotor, lateral vibration occurs in the rotor, and the vibration causes an air gap length. Even if the change occurs, the change in the air gap length occurs around the gap length larger than the gap length at the edge portion, and thus the change in the magnetic flux of the signal-generating electrons is relatively small. Therefore, the magnitude of the erroneous signal voltage induced in the signal coil due to the lateral vibration of the rotor can be reduced, and the erroneous signal voltage triggers the primary current control semiconductor switch of the ignition circuit to malfunction the ignition circuit. You can eliminate the fear.

If the outer peripheral surface of the convex region of the rotor is formed into a cylindrical surface having a central axis at a position eccentric to the opposite side of the central axis of the rotor from the central region of the rotor, The outer peripheral surface can be easily formed by turning or the like.

[0022]

1 to 3 show an embodiment of a signal generator for an internal combustion engine ignition device according to the present invention. It should be noted that parts that are the same as the parts shown in FIGS. 6 and 7 are given the same reference numerals.

FIG. 1 shows a state in which a signal generator is combined with a flywheel magnet generator. In FIG. 1, 1 is a flywheel magnet rotor, 2 is a flywheel magnet generator stator, and 3 is an internal combustion engine. An advance base plate for manually advancing or retarding the ignition device.

The flywheel magnet rotor 1 has a cup-shaped flywheel 4 made of a magnetic material, a boss portion 5 provided at the center of a bottom wall portion 4a of the flywheel, and a peripheral wall portion 4b of the flywheel 4. A main permanent magnet 6 fixed to the inner periphery of the engine and a ring gear 7 fixed to the outer periphery of the peripheral wall portion 4b of the flywheel 4 are provided, and a tapered hole 5a formed in the boss portion 5 is provided with an engine not shown. The rotary shaft is fitted and the boss portion 5 and the rotary shaft are fastened using a screw means to be attached to the engine. The ring gear 7 is used for meshing the output gear of the electric starter that starts the internal combustion engine.

The stator 2 of the flywheel magnet generator is
A stator core 8 having magnetic poles facing the magnetic poles of the main permanent magnet 6 with a gap wound between an exciter coil 9 for ignition power supply and a power-generating coil 10 for lighting / charging, which is fixed. The child is attached to a crankcase or the like of an engine (not shown).

The signal generator according to the present embodiment includes a rotor 11 constructed by using a boss portion 5 as a rotating body, and a signal generator for generating an electric signal in response to a change in magnetic flux generated by the rotor 11. 12 and an electron emission holder 13 for attaching the signal emission electron 12 to the advance base plate 3. The advance base plate 3 to which the signal generator 12 is attached is rotatably held by a crankcase or the like of an engine (not shown),
The ignition position can be advanced or retarded by manually rotating the advance base plate 3.

As shown in FIGS. 2 and 3, the rotor 11 is provided with a concave region 11a and a convex region 11b, which are arranged in the circumferential direction, on the outer periphery of the boss portion 5 as a rotating body. The edge portions 11c and 11d are formed at the boundary between the convex area 11b and the convex area 11b.

The signal generator of this embodiment is for a two-cylinder internal combustion engine ignition device that uses one signal generator to generate an ignition signal at 180-degree intervals. In this signal generator, the concave region 11a and the convex region 11 of the rotor 11 are
b is formed so as to extend over a region of 180 degrees in the circumferential direction, and the edge portions 11c and 11d are formed at symmetrical positions apart from each other by 180 degrees. The outer peripheral surface of the recessed area 11a is formed in the shape of a cylindrical surface having a radius R0 with the central axis O of the boss portion 5 as the central axis. Further, the outer peripheral surface of the convex region 11b is eccentric by a distance δ from the central axis O of the boss portion 5 to the opposite side of the convex region along a straight line passing through the central portion in the circumferential direction and extending in the radial direction of the boss portion 5. It is formed in the shape of a cylindrical surface having a radius R1 having a central axis at the position O ', and the distance R between the outer peripheral surface of the convex area 11b and the central axis O of the boss portion 5 is the outer circumference of the convex area. The edges 11c and 11d on the surface show the maximum value (approx. R1), and gradually decrease from the edges 11c and 11d toward the central portion in the circumferential direction of the convex area 11b, and the center of the convex area increases. The minimum value (R1 -δ) is shown in the part.

The signal emitting electron 12 has a structure similar to that of the signal emitting electron shown in FIGS. 6 and 7, and has an iron core 14 having a magnetic pole portion 14a at one end and one magnetic pole (this magnetic pole) at the other end of the iron core. In the example, the N pole) is magnetically coupled to the permanent magnet 15 and the iron core 14
The signal coil 16 is wound around and the electronic holder 13 is provided. The electronic holder 13 has mounting holes 13c, 1
3 c has a base portion 13 a having both ends, and a yoke portion 13 b standing upright in a direction perpendicular to the plate surface of the mounting portion from the central portion of the base portion 13 a.
The yoke portion 13b of (1) is magnetically coupled to the other magnetic pole (S pole in this example) of the permanent magnet 15. The magnet 15, the iron core 14, and the signal coil 16 are housed in a case 17 made of resin together with the yoke portion 13b of the electronic holder, and a resin 18 is cast in the case 17 so that each part is put in the case by the resin. It is fixed.

The signal emitting electrons 12 are arranged such that the magnetic pole portion 14a faces the outer peripheral surface of the convex portion area 11b of the rotor with the air gap 19 in between. In the present embodiment, the electronic generating holder 13 is fixed to the advance base plate 3 with a screw that penetrates the mounting holes 13c, 13c of the electronic generating holder 13 (see FIG. 1).

The magnetic pole portion 14a of the signal emitting electron 12 and the boss portion 5
Let D be the distance from the central axis O of the magnetic pole portion 14a.
The air gap length G between the rotor and the outer peripheral surface of the convex region 11b of the rotor is such that the magnetic pole portion 14a is the edge portion 11c of the rotor,
The minimum value G1 = D-R1 when facing 11d.
(Approximate value), and shows the maximum value G2 = D-R1 + [delta] when the magnetic pole portion 14a comes into a state of facing the central portion in the circumferential direction of the convex portion region 11b of the rotor. Also, the magnetic pole portion 14a
Is facing the recessed region 11a of the rotor, the gap length between the magnetic pole portion 14a and the outer peripheral surface of the recessed region 11a becomes a constant value G0 = D-R0.

Now, the boss portion 5 is rotated in the direction shown by the arrow CCW in FIG. 2, and the magnetic pole portion 14a of the signal generating electron is in the convex portion area 11b of the rotor in the section where the rotational angle position θ is θ = 0 ° to 180 °.
Is in a state of facing the outer peripheral surface of, and θ = 180 ° to 360
It is assumed that the magnetic pole portion 14a faces the recessed region 11a of the rotor in the section of °. At this time, the air gap length between the magnetic pole portion 14a of the signal generating electron and the outer peripheral surface of the rotor 11 changes as shown by a solid line in FIG. 4A with respect to the rotation angle position θ. Since the magnetic flux of the signal-generating electrons passing through the iron core 14 (iron core magnetic flux) changes as shown in FIG. 9 depending on the air gap length, the magnetic flux flowing through the iron core 14 is shown by a solid line in FIG. It changes like the curve shown by. That is, the section (θ =
180 ° to 360 °), the iron core magnetic flux has an almost constant value φ0.
In the section (θ = 0 ° to 180 °) where the magnetic pole portion 14a faces the outer peripheral surface of the convex portion area 11b of the rotor, the magnetic pole portion 14a gradually changes with the change of the rotation angle position. Further, the iron core magnetic flux shows a maximum value φ1 in the vicinity of θ = 0 ° and 180 ° and a minimum value in the position of θ = 90 °. Signal coil 1
In FIG. 6, a signal voltage having a waveform as shown by the solid line in FIG. 4C, for example, is induced in proportion to the temporal change of the iron core magnetic flux of the signal emitting electron. At the positions of θ = 0 ° and 180 °, a large magnetic flux change suddenly occurs, and at that time, large signal voltages Vs1 and Vs2 which become ignition signals are induced, respectively.
In the section of θ = 0 ° to 180 °, the change in the magnetic flux occurs gently, so that the signal coil 1 is affected by the change in the magnetic flux in this section.
The voltage induced in 6 can be made small enough not to cause misfiring.

Due to the vibration of the rotary shaft of the internal combustion engine, the boss portion 5
Is generated in the rotor, and the horizontal shake occurs in the convex portion area 11b of the rotor.
And the magnetic pole portion 14a of the signal generating electron 12 are opposed to each other, the air gap length between the magnetic pole portion 14a of the signal generating electron and the outer peripheral surface of the convex portion region 11b of the rotor is
For example, as shown by a broken line curve in FIG. 4A, the air gap length G fluctuates between Ga and Gb above and below the air gap length G when there is no vibration. Due to this variation in the air gap length, the iron core magnetic flux of the signal emitting electron 12 also varies between φa and φb as shown by the broken line curve in FIG. 4 (B). A voltage having a waveform as shown by the broken line in FIG. 4C is induced.

In the present invention, when the air gap length fluctuates due to the vibration when the magnetic pole portion 14a of the signal emitting electron faces the intermediate position in the circumferential direction of the outer peripheral surface of the convex portion area 11b of the rotor, the air gap length fluctuates. As illustrated in FIG. 9, since the air gap length fluctuates between Ga and Gb above and below the air gap length G which is larger than the air gap length G1 at the edge portions 11c and 11d of the rotor, the fluctuation of the gap length. The fluctuation range of the iron core magnetic flux of the signal generating electron 12 due to the above can be made much smaller than the fluctuation range of the magnetic flux generated when the air gap length changes due to vibration in the conventional signal generator. Therefore, the magnitude of the erroneous signal voltage induced in the signal coil 16 due to the fluctuation of the air gap length due to the vibration can be made much smaller than that of the conventional one, and the erroneous operation of the ignition circuit can be eliminated by the erroneous signal voltage. You can

In the above-described embodiment, the convex portion area 11 of the rotor is used.
The outer peripheral surface of b is centered at a position eccentric to the side opposite to the convex region 11b from the central axis of the boss 5 along a straight line passing through the center in the circumferential direction and extending in the radial direction of the boss 5 as a rotating body. Although formed in the shape of a cylindrical surface having an axis, the outer peripheral surface of the convex area 11b has the maximum distance between the outer peripheral surface of the convex area and the center of the boss 5 at the edge portions 11c and 11d. It should be formed in a shape that indicates a value and becomes gradually shorter as it goes from the edge portion toward the central portion side in the circumferential direction of the convex region 11b (away from the edge portion). It is not limited to. For example, it is formed in the shape of an elliptic cylinder having a minor axis on a straight line extending in the radial direction of the boss portion 5 through the central portion of the outer peripheral surface of the convex region 11b and extending in the radial direction of the boss portion 5 and sharing a central axis. You may.

In the above embodiment, the rotor is constructed such that the distance between the outer peripheral surface of the convex region 11b and the center of the rotor is at the minimum value at the center of the convex region 11b in the circumferential direction. There is. However, according to the present invention, the convex portion area 11 of the rotor is used.
The distance between the outer peripheral surface of b and the center of the rotating body shows the maximum value at the edge portion, and becomes shorter as the distance from the edge portion increases, that is, as it goes from the edge portion toward the central portion side in the circumferential direction of the convex region. It is sufficient that the distance between the outer peripheral surface of the convex region 11b and the center of the rotating body shows a minimum value at a position slightly deviated from the circumferential center of the convex region 11b of the rotor. You may comprise a rotor in.

In the above embodiment, the recessed area 11 of the rotor
Although the a and the convex region 11b are formed on the outer periphery of the boss portion 5 of the flywheel and the rotor is constituted by the boss portion, the concave region and the convex region are magnetic so that they can be attached to the rotating shaft of the internal combustion engine. It may be formed on the outer periphery of the peripheral wall portion of a cup-shaped flywheel made of a material, and the rotor may be configured by the peripheral wall portion of the flywheel.

In the above embodiment, the recessed area 11 of the rotor
The signal generating device for the two-cylinder internal combustion engine ignition device is configured by forming the a and the convex region 11b over the region of 180 degrees in the circumferential direction and providing one signal generating electron. , N (n is an odd number, for example, 3) signal emitting electrons are arranged at equal angular intervals in the circumferential direction, and n sets (for example, 3 sets) of ignition circuits are used. The present invention can also be applied to the case of configuring a signal generator that supplies a signal to an ignition device that ignites an internal combustion engine of a cylinder.

In the above embodiment, the convex portion area 11b on the outer periphery of the rotating body is formed over the area of 180 degrees in the circumferential direction,
Two signal voltages Vs1 and Vs2 having different polarities, which are generated once per rotation by one signal electron, are used as ignition signals, respectively. Generally, m (m is an integer) number of signal electrons are generated in the circumferential direction. M ignition circuits are used at equal angular intervals, and one of two signal voltages with different polarities, which are generated once per rotation by each signal electron, is used as an ignition signal for each ignition circuit. It is possible to configure a signal generator that supplies a signal to an ignition device that ignites a cylinder internal combustion engine. In this case, the angular width in the circumferential direction of the convex portion area of the rotor is arbitrary.

[0040]

As described above, according to the present invention, the distance between the outer peripheral surface of the convex region provided on the outer periphery of the rotating body and the center of the rotating body exhibits the maximum value at the edge portion, and the edge portion has the maximum value. Since the magnetic pole portion of the signal-generating electron is facing the intermediate position of the outer peripheral surface of the convex portion area of the rotor, the signal is generated by the fluctuation of the air gap length due to the vibration of the engine. The magnitude of the erroneous signal voltage induced in the coil can be reduced. Therefore, there is an advantage in that the ignition circuit can be prevented from malfunctioning due to an erroneous signal voltage caused by vibration, and the engine can be operated stably.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a state in which a signal generator for an internal combustion engine ignition device and a flywheel magnet generator according to an embodiment of the present invention are combined.

FIG. 2 is a partially sectional front view showing an embodiment of a signal generator for an internal combustion engine ignition device according to the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

4 is an example of a change in the air gap length between the magnetic poles of the signal emitting electrons and the outer peripheral surface of the rotor shown in FIG. 2, an example of a change in the iron core magnetic flux of the signal emitting electrons, and induction of a signal coil. FIG. 7 is a waveform diagram showing an example of changes in voltage with respect to a rotation angle θ.

FIG. 5 is a circuit diagram showing an example in which the signal generator is applied to a capacitor discharge type internal combustion engine ignition circuit.

FIG. 6 is a partially sectional front view showing a conventional signal generator for an internal combustion engine ignition device.

7 is a cross-sectional view taken along the line BB of FIG.

8 is an example of a change in the air gap length between the magnetic poles of the signal emitting electrons and the outer peripheral surface of the rotor shown in FIG. 6, an example of a change in the iron core magnetic flux of the signal emitting electrons, and an induced voltage of the signal coil. FIG. 6 is a waveform diagram showing an example of the change of the.

9 is a diagram showing an example of the relationship between the air gap length of the signal-generating electrons shown in FIGS. 2 and 6 and the iron core magnetic flux of the signal-generating electrons.

[Explanation of symbols]

 EX Exciter coil D Rectifier C Ignition energy storage capacitor L1 Ignition coil primary coil L2 Ignition coil secondary coil P Spark plug TH Thyristor RE Double wave rectifier circuit 1 Flywheel magnet rotor 2 Stator 3 Advance base plate 4a Bottom wall 4b Peripheral wall 5 Boss 5a Tapered hole 6 Main permanent magnet 7 Ring gear 8 Stator core 9 Exciter coil 10 Generator coil 11 Rotor 11a Recessed area 11b Convex area 11c, 11d Edge 12 Signal generator 13 Electronic generator Holder 14 Iron core 14a Magnetic pole part 15 Permanent magnet 16 Signal coil 17 Case 19 Air gap

Claims (6)

[Claims] 1. A concave region and a convex region arranged in the circumferential direction are provided on the outer periphery of a rotating body attached to a rotary shaft of an internal combustion engine, and an edge portion is formed at a boundary portion between the concave region and the convex region. And a signal generator that has magnetic poles facing each other on the outer circumference of the rotor through an air gap and detects a magnetic flux change caused by an edge of the rotor to generate an electric signal. In the signal generator for an internal combustion engine ignition device, the distance between the outer peripheral surface of the convex region and the center of the rotating body shows a maximum value at the edge portion, and becomes gradually shorter as the distance from the edge portion increases. A signal generating device for an internal combustion engine ignition device, wherein a shape of an outer peripheral surface of the convex region is set in the. 2. A concave region and a convex region arranged in the circumferential direction are provided on the outer circumference of a rotating body attached to a rotary shaft of an internal combustion engine, and an edge portion is formed at a boundary between the concave region and the convex region. And a signal generator that has magnetic poles facing each other on the outer circumference of the rotor through an air gap and detects a magnetic flux change caused by an edge of the rotor to generate an electric signal. In the signal generator for an internal combustion engine ignition device, the outer peripheral surface of the recessed area is formed in the shape of a cylindrical surface that shares a central axis with the rotating body, and the outer peripheral surface of the protruding area is a central portion in the circumferential direction. It is formed in the shape of a cylindrical surface having a central axis at a position eccentric to the opposite side of the central axis of the rotating body from the central axis of the rotating body along a straight line extending in the radial direction of the rotating body. Signal generation for internal combustion engine ignition device Location. 3. The rotating body is a peripheral wall portion of a cup-shaped flywheel attached to a rotary shaft of an internal combustion engine,
The signal generating device for an internal combustion engine ignition device according to claim 1 or 2, wherein the convex region and the concave region are formed on an outer periphery of a peripheral wall portion of the flywheel, and the peripheral wall portion of the flywheel constitutes the rotor. . 4. The rotator is a boss portion of a flywheel attached to a rotary shaft of an internal combustion engine, the convex region and the concave region are formed on an outer periphery of the boss portion, and the boss portion of the flywheel is The rotor which constitutes the rotor according to claim 1.
Alternatively, the signal generator for the internal combustion engine ignition device according to item 2. 5. The signal generating electron is composed of an iron core having the magnetic pole portion at its tip, a permanent magnet magnetically coupled to the iron core, and a signal coil wound around the iron core. A signal generator for an internal combustion engine ignition device according to claim 1. 6. The signal-generating electron comprises an iron core having the magnetic pole portion at its tip, a permanent magnet magnetically coupled to the iron core, and a magnetic detection element for detecting a magnetic flux flowing in the iron core. 5. The signal generator for an internal combustion engine ignition device according to any one of items 1 to 4.