JPS6048990B2 - Signal generator for non-contact ignition device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal generator for a non-contact ignition device, and is particularly used in an internal combustion engine, and includes a magnetic core disposed at the center of a signal generator coil, and a magnetic induction generator that rotates synchronously with the internal combustion engine. The present invention relates to a signal generator for a non-contact ignition device that generates an output voltage by forming a magnetic circuit between the signal generator and the output voltage.

Conventional signal generators for non-contact sparklers compensate for performance in the low rotation range by simply increasing the operating sensitivity of the electronic circuit, so the ratio between the signal voltage and noise such as leakage magnetic flux ( The problem was that the signal-to-noise ratio (SIN ratio) deteriorated and it malfunctioned due to radio noise. SUMMARY OF THE INVENTION An object of the present invention is to provide a signal generator for a non-contact ignition device that generates a sufficient output voltage even in a low rotation range and enables the design of an electronic circuit that is resistant to disturbances such as radio noise. In the present invention, an outer wall made of a magnetic material is provided on the outer circumferential side of the signal generating coil so that the effective magnetic flux during signal generation can be increased by reducing the leakage magnetic flux that crosses the signal generating coil.

Hereinafter, embodiments of the present invention will be explained based on the drawings while comparing them with conventional examples.

Figures 1 to 3 show one embodiment of the present invention, in which a signal generator for a non-contact ignition device is a disc-shaped signal generator fixed to a crank case (not shown) of an internal combustion engine. It has a pulser base 1, and a hole 2 is provided in the center of the pulser base 1.

A magnetic inductor 3' fixed to a rotating shaft (not shown) of an internal combustion engine is fitted into the hole 2 of the pulser base 1, and the magnetic inductor 3 is made of a magnetic material and has a cylindrical shape. , a plurality of magnetic modulation parts 4 are provided at the distal end portion and protrude in the radial direction with a constant width dimension W. Magnetic modulation section 4
Pulsar base 1 is centered around the area where the tip passes through during rotation.
A cylindrical magnetic core 5 is erected on the upper surface of the holder. A cylindrical signal generating coil 6 is arranged around this magnetic core 5 at its outer periphery.
is fitted, and the tip of the magnetic core 5 is connected to the signal generating coil 6.
It protrudes from the upper end, and its outer circumferential surface faces the magnetic modulation section 4 . Further, a magnetic core bottom portion 7 having an outer diameter close to the signal generating coil 6 is formed at the lower end of the magnetic core 5, and a permanent magnet 8 is interposed between the magnetic core bottom portion 7 and the pulser base 1. There is.

Two mounting seats 9 are provided on the magnetic core bottom 7 at the outer periphery of the signal generating coil 6, and the mounting seats 9 are formed high by a certain dimension so as to surround the outer periphery of the signal generating coil 6. It forms the outer wall 10 of the coil 6.

The signal generating coil 6 and the magnetic core 5 are fixed together with the permanent magnet 8 to the pulsar base 1 by screws 11 at a mounting seat 9 serving as an outer wall 10.

In the above configuration, when the magnetic flux from the permanent magnet 8 faces the magnetic core 5 and the magnetic modulation part 4 of the magnetic inductor 3,
In other words, when the magnetic coupling is tight, the magnetic circuit flows from the permanent magnet 8 to the magnetic core 5 as shown by the arrow in FIG.
Flows from the tip of the magnet to the magnetic inductor 3 through the magnetic modulator 4, and is filtered from the pulser base 1 to the permanent magnet 8.

The magnetic flux at that time is −Φ. There is. Also, when the magnetic inductor 3 rotates and the magnetic coupling with the magnetic core 5 becomes loose, the generator coil 6
A mounting seat 9 as an outer wall 10 whose outer surface is made of a magnetic material.
Since the signal generating coil 6 is surrounded by The magnetic flux crossing the generator coil 6 becomes almost zero.

On the other hand, in the conventional example shown in FIG. 4, the mounting seat 13 of the magnetic core 123 has the same thickness as the magnetic core bottom 14, and the magnetic potential inside the signal generating coil 6 is high, so the magnetic flux Φ leaks from the magnetic core 12. In the meantime, a line Φ1 intersects with the signal generating coil 6 as shown by the arrow.

4. Therefore, the voltage generated by the signal generator coil 6 is expressed as e and the magnetic flux Φ. In the conventional example, Ecc(Φ.

-ΦI) In the embodiment of the present invention, EccOe is obtained, and it is clear that the generated voltage e is larger in the embodiment of the present invention than in the conventional example under the same conditions, and as a result, in the low rotation range ignition performance can be improved.

According to this embodiment, as described above, the output of the signal generator for the non-contact spark ignition device in the low rotation range can be improved, and the startability of the internal combustion engine can be improved.

Furthermore, by using the signal generator for a non-contact ignition device of this embodiment, it is possible to design an electronic circuit that is resistant to disturbances such as radio wave noise. In addition, in this example, the mounting seat part formed integrally with the magnetic core was used as the outer wall, but if it were to surround the outer surface of the signal generation coil, a separate cup-shaped member made of magnetic material could be used. The same effect as in the seventh embodiment can be obtained even if the following is installed. In addition, in conventional signal generators for non-contact ignition devices, multiple signal generator coils were installed on the pulsar base in order to obtain the advance angle required by the internal combustion engine, which had the drawback of high cost and the inability to downsize. Ah, it was.

However, in this embodiment, the width W of the magnetic modulator 4 is made equal to the advance angle in degrees, and attention is paid to the fact that the voltage generated in the signal generator coil 6 is when the magnetic flux changes.
Since the advance angle can be obtained using the two signals generated when the two corners of the magnetic core 5 face the magnetic core 5, there is no need to use a plurality of signal generating coils.

That is, by separating the positive and negative poles of the voltage generated in one signal generating coil 6 and generating a signal as a signal voltage at a predetermined advance angle, one signal generating coil can be omitted.

The magnetic inductor 3 rotates as the internal combustion engine rotates, and when the magnetic modulator 4 approaches and passes the magnetic core 5, the magnetic flux Φ is generated when it begins to face the magnetic core 5 and when it moves away from it.

An increase or decrease occurs in the voltage, and a voltage is generated in the signal generating coil 6. In this embodiment, the phase angle θ formed with respect to the center of the magnetic core by the width W of the magnetic modulation section 4 is made equal to the advance angle required by the internal combustion engine.

Therefore, the phase difference between the positive voltage and the negative voltage generated in the signal generator coil 6 is also equal to θ as shown in FIG. 5, and by inputting these two positive and negative signal voltages to a control circuit (not shown) , it is possible to easily construct a signal generator for a non-contact spark device that advances the angle by θ with one signal generator coil. According to this embodiment, the signal generating coil is required in half compared to the conventional one, making the device less expensive and more compact, making it possible to store the internal combustion engine in a narrow space.

Although FIG. 5 shows that the positive voltage leads the negative voltage, the effect is exactly the same even if this is reversed.
The present invention provides a signal generator for a non-contact ignition device, which has a structure in which part or all of the outer periphery of the signal generation coil is surrounded by an outer wall made of a magnetic material, so that sufficient output can be achieved even in a low rotation range. This has the effect of providing a signal generator for a non-contact ignition device that generates voltage.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a signal generator for a non-contact ignition device according to the present invention, FIG. , a sectional view showing when the magnetic modulation part is separated from the magnetic core, FIG. 4 is a sectional view showing the state in which the magnetic modulation part of a conventional signal generator for a non-contact ignition device is separated from the magnetic core, and FIG. FIG. 2 is a diagram showing a signal generation state of the signal generator for a non-contact ignition device according to the present invention. 11... Pulsar base, 3... Magnetic inductor, 4... Magnetic modulation section, 5... Magnetic core, 6... Signal power generation Coil, 7... Bottom of magnetic core, 8... Permanent magnet, 9... Mounting seat as outer wall, 10... Outer wall.

Claims (1)

[Claims] 1. A plate-shaped pulsar base, a cylindrical signal generating coil disposed on the pulsar base via a permanent magnet, and a signal generating coil having a bottom portion formed between the permanent magnet and the signal generating coil. and a magnetic inductor, which is provided at the center of the pulser base and has a plurality of magnetic modulation parts protruding in the radial direction facing the magnetic core at its tip. A signal generator for a non-contact ignition device, characterized in that a part or the entire outer periphery of the signal generating coil is surrounded by an outer wall made of a magnetic material. 2. The generator for a non-contact flashlight device according to claim 1, characterized in that the magnetic core and the outer wall are connected at the bottom of the magnetic core to form an integral structure. 3. A signal generator for a non-contact ignition device according to claim 2, characterized in that the mounting seat portion of the bottom of the magnetic core is raised to form an outer wall. 4 In claim 1, the width W in the rotational direction facing the magnetic core of the magnetic modulation section provided to protrude in the radial direction at the tip of the magnetic inductor is determined based on the speed required by the internal combustion engine to which the signal generator is attached. A signal generator for a non-contact flashing device, characterized in that it is set equal to angular degrees.