JP2012004238A - Ignition device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of misfire that is caused by conditions such as variations in air-fuel ratio with lean combustion and stratified combustion, smoldering of an ignition plug, and degradation in the inside of a cylinder due to aging.SOLUTION: An ignition device for an internal combustion engine includes a first ignition coil and a second ignition coil in a case, and high voltages generated from the first ignition coil and the second ignition coil are combined and supplied to one ignition plug. As a result, an ignition device for an internal combustion engine is realized which can prevent a misfire caused by adverse conditions, such as variations in air-fuel ratio with lean combustion and stratified combustion, smoldering of an ignition plug and degradation of the inside of a cylinder due to aging, and which can also be easily attached to an engine head.

Description

The present invention relates to an internal combustion engine ignition device.

Conventionally, for example, lean combustion in which an air-fuel mixture having a fuel ratio lower than the stoichiometric air-fuel ratio is burned or stratified combustion is formed by forming a stratified air-fuel mixture in a cylinder in order to improve fuel efficiency. However, it is known that in lean combustion and stratified combustion, there are variations in the air-fuel ratio, and misfires are caused by smoldering spark plugs. And in such a state, what prevents misfire by performing multiple ignition is known.

For example, in Japanese Patent No. 36551304 (hereinafter referred to as “Patent Document 1”), the rise of the secondary voltage is relatively fast and the discharge time is relatively short, and the rise of the secondary voltage is relatively slow. The second ignition coil having a long discharge time characteristic, and the first ignition coil and the second ignition coil are driven independently according to the engine operating state. During the stratified combustion operation, the first ignition coil and the second ignition coil are driven. The ignition coil serves as an ignition control means for driving the first ignition coil earlier than the second ignition coil. Further, the ignition control means drives only the first ignition coil at the time of start-up or operation at a stoichiometric air-fuel ratio or an air-fuel ratio richer than the stoichiometric air-fuel ratio. Further, the ignition control means is configured to perform a predetermined E at a homogeneous lean combustion operation or at a stoichiometric air-fuel ratio.
Only the second ignition coil is driven during the operation of performing EG R at a GR rate or higher.

When a misfire is detected at times other than during stratified combustion operation, the ignition control means drives both the first ignition coil and the second ignition coil. Furthermore, when a misfire is detected during the stratified combustion operation, an ignition device for an internal combustion engine is proposed in which only the first ignition coil is driven as the ignition control means while switching from the stratified combustion operation to the homogeneous combustion operation.

Japanese Patent No. 36551304

However, the above-described conventional ignition device for an internal combustion engine has the following problems. That is, in the ignition device of Patent Document 1, since double ignition is performed on the misfire and the discharge time is lengthened, further conditions such as deterioration inside the cylinder due to secular change and carbon adhering to the spark plug are obtained. When misfires are more likely to occur due to deterioration, normal ignition cannot be performed. Further, the ignition device disclosed in Patent Document 1 does not propose a specific coil to be mounted on the engine.

The present invention has been made in view of the above problems, and prevents misfire caused by further adverse conditions such as air-fuel ratio variations in lean combustion and stratified combustion, smoldering of spark plugs, and deterioration inside the cylinder due to aging. It is an object of the present invention to provide an ignition device for an internal combustion engine that can improve the ignition performance and can be easily attached to an engine head.

In order to solve the above problems, the present invention is configured as follows. That is, according to the first aspect of the present invention, there is provided a case and a primary connector that includes an ignition coil including a primary coil, a secondary coil, and an iron core in the case, and supplies external power to the case. An internal combustion engine ignition device comprising a high-voltage output unit that is disposed and supplies a high voltage to the ignition plug to the case, and the coil housing portion of the case is filled with a mold resin. Each of the ignition coils has an individual primary coil, a secondary coil, and an iron core, and the high-voltage output unit combines the high voltages from the respective ignition coils into one. The ignition device is provided so as to be supplied to one spark plug.

In the above-described configuration, the primary connector may supply external power to the respective ignition coils, and the primary connector for supplying external power to the respective ignition coils may be provided to the case. The ignition coil may be provided individually, and external power may be supplied to the ignition coil individually. The high voltage output section may be formed so as to be embedded in a plug hole of the engine, and the respective ignition coils may be disposed outside the plug hole. Further, the high-voltage output portion is formed of a substantially solid body and is arranged so as to protrude from the lower surface of the case, and the case housing the respective ignition coils has a case fixing portion for fixing to the engine head. There may be at least one, and the high voltage output portion may be fixed to the spark plug by the case fixing portion.

Further, at least one igniter for supplying a primary voltage and an ignition signal may be provided in the case, a high voltage of one of the respective ignition coils is provided in the case, and a current is supplied to the other ignition coil. A diode may be provided to prevent flow. Further, the case may be integrally formed with resin or the like.

As described above, the first ignition coil and the second ignition coil are provided in the case, and the high voltages from the first ignition coil and the second ignition coil are combined and supplied to one ignition plug. By doing so, it is possible to prevent misfires caused by further adverse conditions such as air-fuel ratio variations in lean combustion and stratified combustion, smoldering of spark plugs, deterioration inside the cylinder due to aging, etc., and engine head An ignition device for an internal combustion engine that can be easily attached to the engine can be realized.

1 is a perspective view of an ignition device according to a first embodiment of the present invention. It is BB sectional drawing seen from the arrow (a) direction of the ignition device of FIG.

FIG. 1 is a perspective view of an ignition device according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line BB of the ignition device of FIG.

1 and 2, the case 30 forming the outer shape of the ignition device 60 is formed by integral molding in a box shape having one opening surface. Further, the case 30 is formed with two case fixing portions 32 on the surface substantially perpendicular to the opening surface of the case 30 for fixing the ignition device 60 to an engine head (not shown). Further, a high-voltage output portion 34 for supplying a high voltage to the spark plug is formed on the bottom surface of the case 30 so as to protrude into a plug hole formed in the upper portion of the engine (not shown).

The coil housing portion of the case 30 includes a first ignition coil 70 and a second ignition coil 80, and each of the first ignition coil 70 and the second ignition coil 80 is individually provided with a plurality of thin plates. An iron core 14 formed by laminating a core, a primary coil 10 in which a primary winding is wound around the outer periphery of a primary bobbin formed of resin on the outer periphery of the iron core 14, and the primary coil 10 The secondary coil 12 is formed by winding a secondary winding around 3000 turns on the outer periphery of a secondary bobbin formed of resin on the outer periphery of the coil 10. Further, an igniter 20 for supplying a primary voltage and an ignition signal to the first ignition coil 70 and the second ignition coil 80 is provided in the case 30 to the first ignition coil 70 and the second ignition coil 80. The igniter 20 is individually connected to the first ignition coil 70 and the second ignition coil 80, and the igniter 20 is individually connected to the first ignition coil 70 and the second ignition coil 80. A primary voltage and an ignition signal are supplied to the primary coil 10 of the second ignition coil 80.

Further, a primary connector 24 for connecting a battery (not shown) and an ignition device control unit such as an external ECU (not shown) to the side surface of the case 30 is provided for each of the first ignition coil 70 and the second ignition coil 80 individually. One end of each primary connector 24 is connected to a battery and an ignition device controller such as an external ECU, and the other end of each primary connector 24 is connected to the first ignition coil 70 and the second ignition coil 70. The ignition coil 80 is individually connected to the primary coil 10 and the respective igniters 20. Further, a diode 22 for preventing a high voltage of one of the respective ignition coils 70.80 from flowing through the other ignition coil 70.80 is provided inside the bottom surface of the case 30. Provided in each of the second ignition coils 80, one end of the diode 22 is connected to the first ignition coil 70 and the secondary coil of the second ignition coil 80, and the other end of the diode 22 is connected to the second ignition coil 80. The high voltage output unit 34 is connected.

Further, the high voltage output unit 34 integrates the high voltage output from the first ignition oil 70 and the second ignition coil 80 via the diode 22 into one connection with the diode 22. Wired. Further, the case 30 is filled with a thermosetting mold resin 50 so as to achieve electrical insulation of the ignition device 10 and physical fixation of each member.

Further, the high voltage from the first ignition coil 70 and the second ignition coil 80 is supplied to the ignition plug from the high voltage output section 34 through a conductive member accommodated in the plug hole. Further, the first ignition coil 70 and the second ignition coil 80 are arranged outside the plug hole, and the case fixing portion 32 and the engine head are fixed with screws, so that the ignition plug and the electric ignition coil are electrically connected. It is connected.

As a modification of the above-described embodiment, the primary connector 22 provided in the case 30 is integrated into one, and the voltage from the battery and the control signal from the ignition device controller such as an external ECU are sent to the first ignition coil 70. And may be supplied to both of the second ignition coils 80. Further, the number of the igniters 20 may be arbitrarily changed according to design circumstances, and the ignition control of the ignition device 60 may be performed outside the ignition device 60. Further, the iron core 14 may use a dust core, and the formation position and number of the case fixing portions 32 formed on the case 30 may be arbitrarily changed according to design matters. The formation position and shape of the high-voltage output portion 34 to be formed may be arbitrarily changed according to design matters.

10: 1 primary coil
12: Secondary coil
14: Iron core
20: Igniter
22: Diode
24: Primary connector
30: Case
32: Case fixing part
34: High voltage output section
50: Mold resin
60: Ignition system
70: First ignition coil
80: Second ignition coil

Claims (8)

A case, and an ignition coil including a primary coil, a secondary coil, and an iron core in the case;
A primary connector for supplying power from the outside to the case;
The case includes a high voltage output section for supplying a high voltage to the spark plug,
In the internal combustion engine ignition device in which the coil housing portion of the case is filled with mold resin,
A first ignition coil and a second ignition coil in the case;
Each of the ignition coils has a separate primary coil, secondary coil and iron core,
The ignition apparatus according to claim 1, wherein the high-voltage output unit is provided so that high voltages from the respective ignition coils are combined and supplied to one ignition plug.   The ignition device according to claim 1, wherein the primary connector supplies power from the outside to the respective ignition coils.   A primary connector for supplying power from the outside to the respective ignition coils in the case is individually provided in the respective ignition coils, and power from the outside is individually supplied to the ignition coils. Item 2. The ignition device according to Item 1. The high-voltage output part is formed so as to be embedded in a plug hole of the engine,
The ignition device according to any one of claims 1 to 3, wherein each of the ignition coils is disposed outside the plug hole. The high-voltage output portion is composed of a substantially solid body and is disposed so as to protrude from the lower surface of the case,
The case containing the respective ignition coils has at least one case fixing portion for fixing to the engine head.
The ignition device according to any one of claims 1 to 4, wherein the high-voltage output portion is fixed to the spark plug by the case fixing portion.   The ignition device according to any one of claims 1 to 5, further comprising at least one igniter for supplying a primary voltage and an ignition signal in the case.   The diode according to any one of claims 1 to 6, further comprising a diode for preventing a high voltage of one of the respective ignition coils from flowing through the other ignition coil in the case. The ignition device described.   The ignition device according to any one of claims 1 to 7, wherein the case is integrally formed of resin or the like.

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