JPS58197688A - Ignition device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ignition device that ignites a mixture of air and fuel by spark discharge.

A conventional ignition device of this type is shown in FIG. 1 and explained as follows.
In the figure, (1) is a high voltage terminal, (2) is a high voltage terminal (1
), and this center electrode (2) is electrically connected to the ground electrode (4) which is part of the main case (3).
A discharge gap (5) (also referred to as a discharge gap) is formed opposite to the discharge gap. (6) is the center electrode (2) - an insulator that electrically insulates it, and (7) is a gasket for a hermetic seal.

A high voltage generator (not shown) is installed in the combustion chamber of each cylinder of the ignition system #ItFi internal combustion engine configured as described above.
When the high voltage generated by the 1!
J (5) is disconnected and a spark discharge occurs.

With this spark discharge, the sky is 1! l! (5) The mixture of fuel and air in the vicinity is manned and combustion is started.

However, in the above-described conventional ignition device, the discharge gap is fixed, the area where spark discharge occurs is narrow, and a wide ignition surface cannot be obtained. Furthermore, when the ignition energy is increased to improve ignitability, the discharge current tends to concentrate on the surface of the discharge electrode, which has the disadvantage of shortening the life of the electrode.

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and includes forming a discharge gap between a center electrode and side electrodes provided concentrically with respect to the center electrode, During this discharge, a means for generating magnetic flux is provided to interlink with the discharge WL torrent flowing through the discharge, and by moving the arc plasma generated by the discharge, the ignition surface can be expanded and the life of the electrode can be extended. It provides equipment.

The actual M90 of this invention will be explained below with reference to the drawings.

FIG. 2 is a side sectional view showing an ignition device according to one embodiment νη of the present invention. In the same figure, the same reference numerals as in FIG. 1 indicate the same or corresponding parts, and (21) is a ring-shaped ground electrode as a side electrode provided concentrically with the center electrode (Q). A discharge gap (24) is formed in a portion facing the center electrode 0). Also, the grounding cap is made of the magnetic material and forms a magnetic cap in the magnetic circuit together with the external magnetic pole (22) and internal magnetic pole (23) made of the magnetic material. The magnetic gap in the circuit is made to coincide with the discharge gap (24). (25) is an excitation coil for exciting the above-mentioned magnetic circuit, and this excitation coil (25) is supplied with a predetermined current from an excitation Im power source (not shown), and between the above-mentioned magnetic gap, a discharge gap ≠ da (24) is provided. A magnetic circuit is formed so as to generate a magnetic flux (26) that interlinks with the discharge current flowing through the discharge current.

Next, the operation of the above embodiment will be explained. Here, when tfi is supplied from the excitation aS to the excitation coil (25), -to
Generates magnetic flux in a magnetic circuit. Since the ring-shaped ground electrode (21) that constitutes this magnetic circuit is made of a non-magnetic material,
Most of the magnetic energy generated in the magnetic circuit is concentrated near the ring-shaped ground electrode (21) corresponding to the magnetic gap, generating a* (26) in the discharge gap (24).

In this state, a high voltage is applied from a high voltage generator (not shown) through the high voltage terminal (1) to the discharge gap (2) formed by the middle IL7 electrode (2) and the grounded ring-shaped ground electrode (21).
4) During the discharge due to the high voltage applied to 1! A
A spark discharge occurs at (24), and its release ['i! 1. The flow flows. At this time, the arc plasma generated by the discharge is driven by the electromagnetic force generated by the discharge current and the magnetic flux (26) that crosses the current in the direction perpendicular to the flow of the current, that is, in the direction of the glue of the electrode (21). As a result, the arc plasma caused by the discharge spreads in the circumferential direction,
The ignition surface is expanded and a wide flame surface can be formed. In addition, since the arc plasma moves on the electrode surface, the density of the discharge current decreases, resulting in less wear on the electrode.

FIG. 3 shows another embodiment of the invention, and shows an excitation coil (2
5) and instead of using excitation bombs, use magnets) (3
1), a magnetic flux (26)-i is generated so as to be interlinked with the discharged current flowing into the discharge gap (24), and the same effect as in the above-mentioned embodiment can be obtained in this embodiment. It will be done. In FIG. 3, the same reference numerals as in FIG. 2 indicate the same or corresponding parts.

FIG. 4 is a wiring diagram showing an ignition device according to still another embodiment of the present invention. The ignition device Wt of this example is #! 2
As shown in the figure, a discharge gap (24) is formed by the center electrode (2) and the ring-shaped ground electrode (21), and the ground electrode (21) is magnetically connected to the outer magnetic pole (22) and the inner magnetic pole (23). The structure of the magnetic gap in the circuit and the excitation of this magnetic circuit by the excitation coil (25) are similar to the above-mentioned embodiments, but the excitation coil (25) is replaced by a high-engineered aluminum ignition circuit (50). ) is inserted into the high potential side of the excitation coil (25) to generate magnetic flux using the discharge current flowing through the excitation coil (25). In addition, in FIG. 4, (40) ii ignition system main body (41) represents a batch IJ, (42) an ignition control circuit, (43) an ignition coil, and (44) a switching element, respectively.
The ignition control circuit (42) generates an ignition signal corresponding to the ignition timing. Here, when the switching element (4+) is turned off by the ignition signal generated by the ignition control circuit (42), the current flowing to the primary circuit of the ignition coil (43) is cut off, and the voltage is applied to the secondary circuit. generated. Then, this voltage is applied to fi (24) during discharge of the ignition device main body (40) through the DC blocking diode (45), and spark discharge occurs. At this time, capacitor (48) Fi
Assuming that the high voltage generated from the direct #La voltage power source (4I) is accumulated, the accumulated charge in the capacitor (4a) is 1! during the discharge of the ignition device body (40). i (24).

This allows the discharge current to flow into the exciting coil (25) and generate magnetic flux corresponding to the current. In the figure, (46) Fi high voltage blocking diode, (49)
is the flywheel diode, and (51) is the magnetic field.

Fig. 5 shows yet another embodiment of the present invention, and the differences from Fig. 4 are: - excitation coil (25) for exciting the magnetic circuit;
is provided in the ground ring of the discharge circuit constituting the flat energy key circuit (50), and the same effects as in the above embodiment can be achieved.

As described above, the ignition device of the present invention allows the arc plasma generated by the discharge in the discharge gap to interact with the magnetic field.
Since it is moved by action, the ignition surface is expanded and ignition performance is improved. Moreover, it has an excellent effect of increasing the life of t&.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a conventional ignition device main body, and FIG. 2 is a side sectional view showing an ignition device according to an embodiment of the present invention.
FIG. 3 is a side sectional view showing an ignition device according to another embodiment of the invention, and FIGS. 4 and 5 are wiring diagrams showing ignition devices according to still other embodiments of the invention. (1)...pressure terminal, (2)...center electrode, (
3)...Main case, (6)...-insulator, (T
)...Gasket, (21)...Ring-shaped ground electrode, (22...Outer magnetic pole, (23)--Inner magnetic pole, (24)・m-・Discharge gap, (25 )・e...Excitation coil, (26)...Magnetic flux, (31)...Magnet, (50)...High energy ignition circuit. Agent Shin Kuzuno - Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] (1) A discharge gap is formed between a center electrode and a side electrode provided concentrically with respect to the center electrode, and the discharge current flows through the discharge gap. An ignition device characterized by being equipped with means for generating magnetic flux. (2) Ignition device #I7t according to claim 1, wherein the means for generating magnetic flux comprises an excitation coil and an excitation power source. (3) The ignition device according to claim 1, wherein the means for generating magnetic flux comprises a magnet. (4) The ignition device according to claim 2, characterized in that the discharge wLt current flows through the excitation coil. (5) The magnetic gap in the magnetic circuit that generates the magnetic flux is aligned with the discharge gap. Claim 1 characterized in that
A dot enlarging device according to any one of items 1 to 4.