JPH0613377U - Signal generator for internal combustion engine ignition device - Google Patents

Abstract

(57) [Abstract] [Purpose] To make a rotor yoke equipped with a reluctor common to many types of engines. [Arrangement] An arc-shaped first projection 31 and a second projection 32 are provided on the end surface of the rotor yoke 2 on the side of the opening with their positions displaced in the radial and circumferential directions. The signal generating electron 4 includes a fixed yoke 5, a pair of magnetic pole cores 61 and 62 arranged to face the opposed wall portions 51 and 52 of the fixed yoke, and the wall portion 5.
1 and the magnetic pole core 61, and between the wall portion 52 and the magnetic pole core 62, and permanent magnets 71 and 72, respectively, and a magnetic detection element 8 arranged between the magnetic pole cores 61 and 62. The wall portion 51 and the magnetic pole core 61 of the fixed yoke are opposed to the first protrusion 31 of the rotor, and the wall portion 52 and the magnetic pole core 62 are opposed to the second protrusion 32 of the rotor.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a signal generator for an internal combustion engine ignition device, which generates an ignition signal using a magnetic detection element.

[0002]

[Prior art]

 The present invention relates to a signal generator for an internal combustion engine ignition device that generates an ignition signal using a magnetic sensor.

[0003]

[Prior art]

 Generally, in an ignition device for an internal combustion engine, a semiconductor switch for primary current control provided on the primary side of the ignition coil is turned off or turned on to suddenly change the primary current of the ignition coil, and the secondary current of the ignition coil is changed. A high voltage for ignition is induced in the coil.

This type of ignition device requires an ignition signal (a signal for determining the ignition position) to operate the primary current control semiconductor switch at the ignition position of the internal combustion engine. Therefore, in general, a signal generator is attached to an internal combustion engine and the signal obtained from the signal generator is used as an ignition signal, or the engine rotation angle information and speed included in the output signal of the signal generator are used. The ignition position is calculated based on the information and the ignition signal is generated at the ignition position. In any case, in order to drive the ignition device for the internal combustion engine, a signal generator that generates a signal in synchronization with the rotation of the engine is required.

Various types of signal generators have been put into practical use, and one using a magnetic sensor such as a Hall IC is known as one of them. FIG. 6 shows an example of an ignition device using this kind of signal generating device. In this ignition device, the ignition is performed through a rectifier D by the output of an exciter coil EX provided in a magnet generator that rotates in synchronization with the engine. The ernegi storage capacitor C is charged, and at the ignition position of the engine, an ignition signal is given from the signal generator 4 to the gate of the thyristor TH as a semiconductor switch for controlling the primary current so that the thyristor becomes conductive. When the thyristor TH is turned on, the charge of the ignition energy storage capacitor C is discharged through the primary coil L1 of the ignition coil, so that a large magnetic flux change occurs in the iron core of the ignition coil and a high voltage is induced in the secondary coil L2. . Since this high voltage is applied to the spark plug P, sparks fly to the spark plug and the mechanism is ignited.

The signal generator 4 includes a magnetic sensor composed of a Hall element or a Hall IC, and the input terminal 4 a of the magnetic sensor has a DC voltage obtained by rectifying a part of the output of the exciter coil EX. Alternatively, a low drive voltage obtained by a battery is applied, and when a magnetic flux change is applied to the magnetic sensor at the ignition position of the engine, a signal voltage is obtained at the output terminal 4b.

FIGS. 7A and 7B show a structure of a conventional signal generator using a magnetic sensor. This signal generator is composed of a rotor 1 having a reluctor 3 provided on the outer circumference of a peripheral wall portion 21 of a rotor yoke (flywheel) 2 formed of a magnetic material and formed into a substantially cup shape, and a signal generating electron 4. Has become.

The signal generator 4 includes a magnetic path forming member 9 having a central leg 9a, and a magnetic sensor 8 is fixed to the tip of the central leg 9a. The magnetic sensor 8 is composed of a Hall IC, and one surface of the magnetic sensor 8 is attached so as to face the reluctor 3 via a gap. First and second permanent magnets 71 and 72 are attached to both sides of the central leg portion 9a, and one magnetic pole of these magnets faces the reluctor 3 via a gap. The magnetic poles of the permanent magnets 71 and 72 on the side facing the reluctor are differently polarized, and the reluctor 3 faces the first permanent magnet 71 and the magnetic sensor 8. The magnetic flux in the direction indicated by flows through the magnetic sensor 8. When the rotor 1 rotates in the direction indicated by the solid line arrow and the reluctor 3 faces the magnetic sensor 8 and the second permanent magnet 72, a magnetic flux in the direction opposite to the direction indicated by the broken line arrow passes through the magnetic sensor 8. Flowing. Therefore, the magnetic flux passing through the magnetic sensor 8 alternates as the rotor 1 rotates, and an electric signal is output from the magnetic sensor 8 in response to the alternating magnetic flux.

A magnet 10 is usually attached to the inner circumference of the rotor yoke 2, and the rotor yoke and the magnet 10 constitute a rotor of a magnet generator. The rotor yoke 2 has a boss portion 2a at the center of its bottom wall portion, and the boss portion is attached to the rotary shaft of the internal combustion engine. The output of the magnetic generator is used as a power source for the ignition device (in the ignition device of FIG. 6, a charging power source for the capacitor C), a power source for a lighting load, and the like.

[0010]

[Problems to be solved by the device]

 In the above conventional signal generator, the reluctor is provided on the outer circumference of the peripheral wall of the rotor yoke. Therefore, when another member of the engine is fitted on the outer circumference of the peripheral wall portion of the rotor yoke, the position of the reluctor may be restricted thereby.

For example, in an internal combustion engine equipped with a starter motor, a ring gear that meshes with a pinion gear of the starter motor is often fitted around the outer peripheral wall of the rotor yoke. In this case, the axial ring gear fitting position of the rotor yoke differs depending on the engine and is not constant. Therefore, when fitting the ring gear to the rotor yoke, it is necessary to change the axial direction position of the reluctor for each different fitting position of the ring gear, and the rotor yoke is commonly used for many types of engines. There was a problem that I could not do it.

An object of the present invention is to provide an internal combustion engine in which the reluctor does not affect the attachment of other members to the outer circumference of the rotor yoke, so that the rotor yoke can be shared by many types of engines. An object is to provide a signal generator for an ignition device.

[0013]

[Means for Solving the Problems]

 The present invention comprises a rotor in which a reluctor is provided on a rotor yoke formed in a substantially cup shape, and a signal generator that detects a change in magnetic flux generated by the reluctor to generate a signal voltage. Also, the present invention relates to a signal generator for an internal combustion engine ignition device, wherein the position of the reluctor is not affected by the mounting positions of other members mounted on the outer circumference of the peripheral wall of the rotor yoke.

According to the present invention, the first arc-shaped projection that is provided on the end surface of the rotor yoke on the opening side and the rotor in a state of being located radially inward of the first projection. A reluctor is formed by the arc-shaped second projections protruding from the end surface of the yoke on the opening side. The first and second projections of the reluctor are provided coaxially with the rotor yoke and displaced in the circumferential direction.

The signal-generating electrons have first and second wall portions that face each other in the radial direction of the rotor yoke, and a connecting portion that connects the rear end portions of both wall portions to the first wall portion. A fixed yoke having a magnetic pole surface facing the outer peripheral surface of the first projection and the inner peripheral surface of the second projection of the reluctor on the front end side and the front end side of the second wall portion of the reluctor, respectively. A first magnetic pole core having a magnetic pole surface facing the inner peripheral surface of the first projection of the reluctor and facing the inner wall of the reluctor, and a second wall portion of the fixed yoke. The second magnetic pole core having a magnetic pole surface facing the outer peripheral surface of the second protrusion of the reluctor on the tip side, and the first magnetic pole core disposed between the first wall portion and the first magnetic pole core of the fixed yoke. The first magnet magnetized in the opposite direction of the wall portion and the first magnetic pole core, and the second wall portion of the fixed yoke and the second magnetic pole core. A second magnet which is arranged between the first magnet and the second magnet and is magnetized in a direction opposite to the magnetizing direction of the first magnet; and a magnetic detection element which is arranged between the first magnetic pole core and the second magnetic pole core. Constitute.

[0016]

[Action]

 With the above structure, the outer peripheral surface and the inner peripheral surface of the first projection of the reluctor face the magnetic pole surface of the first wall of the fixed yoke for signal emission electrons and the magnetic pole surface of the first magnetic pole core, respectively. In this state, the magnetic flux in one direction flows from the second magnet through the first protrusion of the reluctor to the magnetic detection element, the rotor rotates, and the inner and outer peripheral surfaces of the second protrusion of the reluctor are respectively rotated. In the state of facing the magnetic pole surface of the second wall portion of the fixed yoke and the magnetic pole surface of the second magnetic pole core, magnetic flux in the opposite direction flows from the first magnet through the second protrusion of the reluctor to the magnetic detection element. Therefore, the rotation of the rotor causes a magnetic flux change alternating with the magnetic detection element.

Since the first and second protrusions of the reluctor are provided so as to project from the end face of the rotor yoke on the opening side, the reluctor affects the mounting of parts on the outer circumference of the peripheral wall of the rotor yoke. Never give. Therefore, when another member such as a ring gear is mounted on the outer periphery of the rotor yoke, it is not necessary to change the position of the reluctor according to the mounting position of the component, and the rotor yoke can be mounted on many types of engines. Can be shared.

[0018]

【Example】

 FIG. 1 shows the entire structure of an embodiment of the present invention, and FIG. 2 shows an enlarged main part of FIG. In these drawings, reference numeral 1 denotes a rotor in which a reluctor 3 is provided on a rotor yoke 2 which is made of a magnetic material and is formed in a substantially cup shape. The rotor 1 is attached to a rotary shaft of an internal combustion engine (not shown) by a boss portion 11 provided at the center of the bottom wall portion 22 of the rotor yoke 2. A signal generator 4 is fixed to a crankcase or the like of an engine (not shown), and the signal generator 4 and the rotor 1 constitute a signal generator for an internal combustion engine ignition device.

For the rotor yoke 2, for example, a cup-shaped flywheel of a flywheel magnet generator can be used, and other members such as a ring gear are fitted to the outer periphery of the peripheral wall portion 21 thereof as needed. To be done. In that case, a permanent magnet 10 is attached to the inner circumference of the peripheral wall portion of the rotor yoke (flywheel) 2, and the rotor yoke 2 and the permanent magnet 10 constitute the rotor of the magneto-generator.

As shown in FIG. 2 and FIG. 3B, a first protrusion 31 and a second protrusion 32 project in the axial direction on the opening-side end surface 22 of the peripheral wall portion 21 of the rotor yoke. The reluctor 3 is constituted by the first and second protrusions 31 and 32. The first and second protrusions 31 and 32 are formed in an arc shape, and are provided so that their respective central axes coincide with the central axis of the rotor yoke 2. The first and second protrusions are provided such that the second protrusion 32 is located radially inward of the first protrusion 31 and are displaced from each other in the circumferential direction.

As shown in FIGS. 2 and 3 (A), the signal-generating electron 4 has a fixed yoke 5, first and second magnetic pole cores 61 and 62, first and second magnets 71 and It is composed of 72 and the magnetic detection element 8.

The fixed yoke 5 is made of a magnetic material plate, and connects the first wall portion 51 and the second wall portion 52, which are opposed to each other in the radial direction of the rotor yoke 2, and the rear end portions of the both wall portions. And the outer peripheral surface of the first protrusion 31 of the reluctor and the inner peripheral surface of the second protrusion 32 of the reluctor, respectively, on the respective tip sides of the first and second wall portions 51 and 52. Opposing magnetic pole surfaces 51a and 52a are formed. The first magnetic pole core 61 is arranged so as to face the first wall portion 51 of the fixed yoke, and a magnetic pole surface 61a that faces the inner peripheral surface of the first protrusion 31 of the reluctor is formed on the tip side thereof. There is. The second magnetic pole core 62 is arranged so as to face the second wall portion 52 of the fixed yoke, and a magnetic pole surface 62a facing the outer peripheral surface of the second protrusion 32 of the reluctor is formed on the tip end side thereof. .

The first magnet 71 is disposed between the first wall portion 51 of the fixed yoke and the first magnetic pole core 61, and is arranged in the opposing direction of the first wall portion 51 and the first magnetic pole core 61. Has been magnetized. The second magnet 72 is arranged between the second wall portion 52 of the fixed yoke and the second magnetic pole core 62, and is magnetized in the opposite direction to the first magnet 71. In this embodiment, the first magnet 71 and the second magnet 72 are magnetized so that the first magnetic pole core 61 and the second magnetic pole core 62 are both N poles.

The magnetic detection element 8 is composed of a Hall IC, and is arranged between the first magnetic pole core 61 and the second magnetic pole core 62. A constant voltage DC voltage is applied to the input terminal of the magnetic detection element 8 from a power source (not shown), and the magnetic detection element 8 is sensitive to the magnetic flux generated by the magnetic fields generated by the first and second magnets 71 and 72. Output an electric signal to the output terminal of.

Mounting holes 53a and 53b are provided near both ends of the connecting portion 53 of the fixed yoke, respectively, and the signal generator 4 is screwed through these mounting holes so that the signal generator 4 is not shown in the crankcase of the engine. Etc. are fixed.

In the state shown in FIG. 4A, in which the first protrusion 31 of the reluctor faces the magnetic pole surface 51 a of the first wall portion 51 of the fixed yoke and the magnetic pole surface 61 a of the first magnetic pole core 61, The magnetic flux generated from the first magnet 71 is the N pole of the first magnet 71 → the first magnetic pole core 61 → the first protrusion 31 of the inductor → the first wall portion 51 of the fixed yoke → the first magnet 71. The first magnet 71 is magnetically short-circuited by flowing through the S pole of the second magnet 72, but the magnetic field generated by the second magnet 72 causes the N pole of the second magnet 72 → the second magnetic pole core 62 → Magnetic detection element 8 → first magnetic pole iron core 61 → first protrusion 31 of reluctor → first wall portion 51 of fixed yoke → connecting portion 53 → second wall portion 52 → S pole of second magnet 72 The magnetic flux flows in the path of, and the magnetic flux φa (magnetic flux density Ba) in the direction of the dashed arrow in the figure flows in the magnetic detection element 8.The rotor 1 rotates in the direction shown by the solid arrow in FIG. 3B, and the second protrusion 32 of the reluctor causes the magnetic pole surface 52a of the second wall portion 52 of the fixed yoke and the second magnetic pole core 62 to move. In the state shown in FIG. 4B facing the magnetic pole surface 62a, the magnetic flux from the second magnet 72 is the N pole of the second magnet 72 → the second magnetic pole core 62 → the second protrusion of the reluctor. The second magnet 72 is magnetically short-circuited by the flow of the origin 32 → the second wall portion 52 of the fixed yoke → the S pole of the second magnet 72, but the second magnet 72 is magnetically short-circuited by the magnetic field generated by the first magnet 71. N pole of the first magnet 71 → first magnetic pole core 61 → magnetic detecting element 8 → second magnetic pole core 62 → second protrusion 32 of the reluctor → second wall portion 52 of the fixed yoke → connecting portion 53 → the second The magnetic flux flows in the path from the wall portion 51 of the first magnet 71 to the south pole of the first magnet 71, and the magnetic detection element is indicated by the broken arrow Magnetic flux φa as shown by the opposite direction of the magnetic flux .phi.b (magnetic flux density Bb) flows.

FIG. 5A shows how the magnetic flux density B detected by the magnetic detection element 8 changes when the rotor 1 rotates, with respect to the rotation angle θ. Shows the waveform of the electric signal output from the magnetic detection element (Hall IC) according to the change of the magnetic flux density. When the magnetic flux density Ba increases while the magnetic flux flows in one direction through the magnetic detection element 8 and the magnetic flux density reaches the output operation level + Bt of the Hall IC at the rotation angle position θ1, the output of the magnetic detection element becomes high ( H), the direction of the magnetic flux reverses, and when the magnetic flux density Bb reaches the output operation level -Bt of the Hall IC at the rotation angle position θ2, the output of the magnetic detection element becomes low level (L). When a high level electric signal output is supplied to the semiconductor switch for controlling the primary current of the ignition circuit as an ignition signal, ignition can be performed at the rotational angle position θ1.

Further, there is known an ignition device which calculates an ignition position based on rotation angle information and speed information included in a signal obtained from a signal emitting electron. The signal generator of the present invention uses such an ignition device. It can also be used for the purpose of supplying a signal to the device.

For example, there is known an ignition device that inputs signals generated at the maximum advance position and the minimum advance position of the engine and calculates the ignition position at each rotation speed. When obtaining a signal to be supplied to such an ignition device, the first protrusion 3 1 and the second protrusion 32 forming the reluctor 3 are arranged with a space in the circumferential direction, and at the same time, the first protrusion 3 is arranged. By setting the circumferential distance from the front end of No. 1 to the front end of the second protrusion 32 in accordance with the maximum advance angle width, the angle θ1 at which the signal output of the magnetic detection element rises to a high level and the output signal is at a low level. The angle θ2 at which the engine falls is corresponded to the maximum advance position and the minimum advance position of the engine, respectively.

In the above embodiment, the magnetic detection element 8 is composed of the Hall IC. However, the Hall element is used as the magnetic detection element, and the amplifier circuit and the waveform shaping circuit are connected to the output side as necessary. Good.

[0031]

As described above, according to the present invention, the arc-shaped first projections and the second projections constituting the reluctor are formed on the opening side of the peripheral wall portion of the rotor yoke formed in the cup shape. Since it is provided so as to project from the end surface of the rotor, the reluctor does not affect the mounting of parts on the outer circumference of the peripheral wall of the rotor yoke. Therefore, when another member such as a ring gear is mounted on the outer periphery of the rotor yoke, it is not necessary to change the position of the reluctor according to the mounting position of the component, and the rotor yoke can be used for many types of engines. There is an advantage that can be shared.

[Brief description of drawings]

FIG. 1 is a sectional view showing the overall structure of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the embodiment shown in FIG.

3A is a perspective view showing signal emission electrons used in the embodiment of FIG. 1, and FIG. 3B is a perspective view showing a main part of a rotor used in the embodiment of FIG.

FIG. 4 shows the structure of the essential part of the embodiment shown in FIG.
(A) and (B) show a state in which the first projection of the reluctor faces the first magnetic pole surface of the fixed yoke and a state in which the second projection of the reluctor faces the second magnetic pole surface of the fixed yoke, respectively. FIG.

5A is a diagram showing a waveform of a magnetic flux density detected by the magnetic detection element in the embodiment of FIG. 1, and FIG. 5B is a diagram showing a waveform of an output signal of the magnetic detection element.

FIG. 6 is a connection diagram showing an example of an ignition circuit using a signal obtained from the signal generator of the present invention.

7A and 7B show a structure of a conventional example, where FIG. 7A is a front view and FIG. 7B is a vertical sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotor 2 rotor yoke 3 reluctor 31 1st protrusion 32 2nd protrusion 4 signal generator 5 fixed yoke 51 1st wall part 52 2nd wall part 53 connection part 61 1st magnetic pole core 62 2nd Magnetic pole core 71 First magnet 72 Second magnet 8 Magnetic detection element

Claims (1)

[Scope of utility model registration request] 1. A rotor comprising a rotor yoke formed in a substantially cup shape and provided with a reluctant, and a signal generator for detecting a change in magnetic flux generated by the reluctor to generate a signal voltage. In the signal generating device for an internal combustion engine ignition device, the reluctor is located on an inner side in a radial direction of the arc-shaped first projection protruding from the end surface of the rotor yoke on the opening side. And a second arc-shaped projection protruding from the end surface of the rotor yoke on the side of the opening, the first projection and the second projection being coaxial with the rotor yoke. The first and second wall portions of the rotor yoke, which are opposed to each other in the radial direction of the rotor yoke, are connected to the rear end portions of the both wall portions. A connecting portion and a distal end side of the first wall portion and a second wall portion A fixed yoke having a magnetic pole surface formed on the tip side thereof, the magnetic pole surface facing the outer peripheral surface of the first projection and the inner peripheral surface of the second projection, respectively, and the fixed yoke arranged to face the first wall portion of the fixed yoke. A first magnetic pole core having a magnetic pole surface facing the inner peripheral surface of the first protrusion on the tip side, and a magnetic pole arranged to face the second wall portion of the fixed yoke and facing the outer peripheral surface of the second protrusion. A second magnetic pole core having a surface on the front end side, and a direction in which the first wall portion and the first magnetic pole core oppose each other and are arranged between the first wall portion and the first magnetic pole core of the fixed yoke. Is magnetized in the direction opposite to the magnetizing direction of the first magnet, which is disposed between the first magnet magnetized in the first magnet and the second wall portion of the fixed yoke and the second magnetic pole core. A second magnet, and a magnetic detection element arranged between the first magnetic pole core and the second magnetic pole core. Internal combustion engine ignition device for a signal generator.