Electrical noise eliminator for igniters

Abstract

To eliminate electrical noise which causes damage to an igniter forming a part of an ignition device of a gasoline engine.SOLUTION: An electrical noise elimination device for an igniter eliminates electrical noise of an igniter forming a part of an ignition device of a gasoline engine. The device includes a sheet-like device body which is adhered and fixed to an outer surface of an igniter case, in which an electric circuit is housed, with an adhesive or a double-sided tape or a fastening tool. The device body is partially formed by an electromagnetic wave absorption sheet which absorbs electromagnetic waves.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention 、 Igniter for Electrical Noise Removal Device Regarding 。 [Background technology]

[0002] The ignition device for a gasoline engine of an automobile or the like is composed of a spark plug, an ignition coil for ignition, and an igniter located above the spark plug and equipped with an electric circuit for controlling ignition timing (see Patent Documents 1 and 2 below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-110167 [Patent Document 2] JP Patent Publication No. Hei 9-112402

[0004] The igniter's electrical circuit is located directly above the ignition coil, and the ignition coil generates a high voltage of 30,000 volts, which creates a spark to burn fuel in the spark plug below it.As a result, high electromagnetic waves are generated from both the ignition coil and the spark plug, causing damage to the igniter's electrical circuit located directly above the ignition coil. Furthermore, to burn fuel efficiently, electricity must be sent to the ignition coil at the correct ignition timing. However, there is a problem in that the igniter's electrical circuit can be damaged by external high-frequency current radiation noise and electromagnetic noise generated by ignition devices, generators, and on-board air conditioners, causing the circuit to malfunction. Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to protect the circuit from electromagnetic noise that can cause damage to the electric circuit of an igniter, and to make the circuit less susceptible to the effects of noise. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides an igniter electrical noise elimination device that eliminates electrical noise from an igniter that constitutes a part of an ignition device of a gasoline engine, and includes: The device has a sheet-like device body that is attached to the outer surface of an igniter case that houses an electric circuit by adhesive, double-sided tape, or a fastener; The device body is at least partially constituted by an electromagnetic wave absorbing sheet that absorbs electromagnetic waves. It is characterized by:

[0007] The device body has an electromagnetic wave absorbing sheet that absorbs electromagnetic waves and an electromagnetic wave reflecting sheet that reflects electromagnetic waves, and the electromagnetic wave reflecting sheet is superimposed on the electromagnetic wave absorbing sheet in a state where it is positioned on the outer side farther from the igniter case than the electromagnetic wave absorbing sheet. It may also be something.

[0008] The aforementioned The device body is equipped with an electromagnetic wave absorbing sheet that has the property of absorbing high-frequency electromagnetic waves. 、 Electromagnetic wave absorbing sheet with the ability to absorb low-frequency electromagnetic waves and may be laminated.

[0009] A plurality of electromagnetic wave absorbing sheets having the property of absorbing low frequency electromagnetic waves are provided on the outer side of the electromagnetic wave absorbing sheets having the property of absorbing high frequency electromagnetic waves. It may also be something.

[0010] A plurality of the electromagnetic wave absorbing sheets are provided, and the electromagnetic wave reflecting sheet is interposed between the electromagnetic wave absorbing sheets. It may also be something.

[0011] The electromagnetic wave absorbing sheet arranged on the inner side, closer to the igniter case than the electromagnetic wave reflecting sheet, has the property of absorbing high frequency electromagnetic waves, and the electromagnetic wave absorbing sheet arranged on the outer side, farther from the igniter case, has the property of absorbing low frequency electromagnetic waves. It may also be something.

[0012] The outer surface of the device body, which is the surface farther from the igniter case, may be covered with a heat-resistant sheet made of a material that is more heat-resistant than the outer surface.

[0013] The device body is the igniter case external surfaceThe electric circuit may be fixed to a flat portion of the electric circuit. [Effects of the Invention]

[0014] By attaching an electrical noise eliminator to the exterior of the igniter, combustion efficiency was improved and both engine noise and vibration were reduced.

[0015] In addition, by fixing the electrical noise eliminator to the outer surface of the igniter, , improved combustion efficiency and increased torque in gasoline engines. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a plan perspective view of an electrical noise removal device for an igniter according to one embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing the state in which the electrical noise removal device for an igniter according to the present invention is attached to the outer surface (top surface) of an igniter case. [Figure 3] FIG. 3 is a graph showing the measured values ​​of the concentration (ppm / volume ratio) of hydrocarbons (HC) in the exhaust gas emitted during idling from a vehicle with the igniter electrical noise eliminator device of this invention attached to the outer surface (top surface) of the igniter case. [Figure 4] Figure 4 is a graph showing the engine rotation torque values ​​before and after the seat was installed. DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment of the present invention is shown in FIGS. An igniter 3 is fixed integrally to the top of the ignition coil 4, and an electric circuit 2 of the igniter is built into the upper part of an igniter case 3a (made of resin). The igniter electric noise eliminator 1 is in the form of a tape, and the igniter electric noise eliminator 1 is provided on its underside with an electromagnetic wave absorbing sheet E having the property of absorbing high frequency electromagnetic waves in the range of 100 MHz to 3 GHz. The upper side of the igniter electrical noise eliminator 1 is provided with two layers of electromagnetic wave absorbing sheets B and C, which have the property of absorbing low frequency electromagnetic waves in the range of several MHz to 1 GHz. The igniter electrical noise removal device 1 is provided with an electromagnetic wave reflective sheet D made of copper foil between the upper electromagnetic wave absorbing sheets B and C that absorb low frequencies and the lower electromagnetic wave absorbing sheet E that absorbs high frequencies. The electrical noise removal device for an igniter 1 is provided with a heat-resistant sheet A made of heat-resistant resin at the top position (the outer surface that is the surface farther from the igniter case 3a). An adhesive sheet F is provided at the bottom of the electromagnetic wave absorbing sheet E that absorbs high frequency waves, so that it can be easily fixed to the outer surface (top) of the igniter 3. The electromagnetic wave absorbing sheets B, C, and E may be commercially available electromagnetic wave absorbing sheets.

[0018] (How to use the sheet) If there are other accessories such as an air cleaner above Igniter 3, move them temporarily. Once the igniter 3 is exposed, cut the igniter electrical noise eliminator 1 into pieces using scissors or similar to fit the shape and number of igniters 3, and secure them to the flat, outer surface (top) of the igniter case 3a using an adhesive sheet (double-sided tape). Return any auxiliary equipment, such as the air cleaner, that you moved earlier to their original locations.

[0019] By closely fixing the igniter electrical noise removal device 1 to the outer surface of the igniter case 3a, the following effects (phenomena) were obtained. Symptoms observed included a reduction in engine noise, a change in the quality of the engine noise, and a reduction in vibration of the engine itself. In addition, combustion efficiency improved, resulting in an increase in the rotational torque of the gasoline engine. Furthermore, by laminating electromagnetic wave reflection sheet D, which is overlaid on the electromagnetic wave absorption sheets B, C, and E and reflects electromagnetic waves, it is possible to minimize the adverse effects on the igniter's electrical circuitry of electromagnetic waves generated not only by the electromagnetic radiation waves generated from the ignition coil and spark plug, but also by electromagnetic waves generated from auxiliary equipment around the engine such as external generators and air conditioners. Furthermore, by laminating an electromagnetic wave absorbing sheet having the property of absorbing high frequency electromagnetic waves and an electromagnetic wave absorbing sheet having the property of absorbing low frequency electromagnetic waves, it is possible to absorb electromagnetic waves in a wide frequency band.

[0020] Running the engine generates electromagnetic waves that have a negative effect on the electrical system, preventing it from performing at its full potential. In particular, combustion systems have high voltages and are in an environment where high-frequency currents are likely to be generated. The igniter circuit that controls the ignition timing of the spark plugs receives low-voltage signals from the computer that controls the engine, so it is easily affected by radiation from high-frequency currents and is prone to disruption of proper transmission timing. In addition, many of the engine's peripheral devices, such as generators and air conditioners, as well as the engine itself, are equipped with components that generate electromagnetic waves, making the car itself a mass of noise. By attaching the electrical noise eliminator 1 for igniters to the top of the igniter, the effects of radiation of electromagnetic waves and high-frequency currents can be reduced, allowing the circuit to exhibit its original performance, combustion to occur with accurate ignition timing, and the engine's original performance to be brought out. This is expected to increase engine torque and horsepower. In particular, low-speed torque increases, eliminating the need for excessive accelerator operation, making it possible to improve fuel efficiency depending on accelerator operation. Vehicles with small engine displacement, such as light cars, will benefit greatly. (Seat performance test results)

[0021] The graph in FIG. 3 shows the change in hydrocarbon (HC) concentration in the exhaust gas before and after the installation of the electrical noise removal device for an igniter of the present invention in a gasoline engine. (Environmental data during performance testing) Vehicle manufacturer: Mitsubishi Motors Sales Co., Ltd. Vehicle name and specifications: Town Box 660cc turbo model Registration year: 2019 Measuring equipment: HORIBA automobile exhaust gas measuring instrument MEXA-324L Measurement date: Sunday, April 25, 2021 Measurement conditions: Test vehicle is fully warmed up (engine water temperature 55°C or higher) and idling Measurement method: Insert the measuring device sensor into the exhaust port of the test vehicle and measure the value after one minute. Measurement results: Figure 3 shows the HC (hydrocarbon) concentration in the engine before and after installation. According to the above experiment, the HC concentration was 50 ppm before the igniter electrical noise eliminator was installed, but after installation, the measured value was halved to 25 ppm. The reason for this halving is thought to be that the igniter electrical noise eliminator suppresses electrical noise that has a negative effect on the igniter, allowing the igniter to perform at its best and promoting engine combustion, which in turn reduces the hydrocarbon (HC) concentration in the exhaust gas. The graph in FIG. 4 shows the change in rotational torque before and after the installation of the electrical noise removal device for an igniter of the present invention on a gasoline engine. (Environmental data during performance testing) Vehicle manufacturer: Mazda Motor Corporation Vehicle name and specifications: Demio 15MB 1500cc Registration year: 2016 Measuring equipment: Dynapac automobile engine power measuring instrument Measurement date: Sunday, July 4, 2021 Measurement conditions: The test vehicle is fully warmed up (engine water temperature is 55°C or higher) and power is taken directly from the axle. Measurement method: A measuring device is connected to the drive wheels of the test vehicle with the tires removed, and the engine is run up to its limiting speed while a load is applied by the measuring device. The computer attached to the measuring device analyzes the data and displays the numerical values. Measurement results: The measured values ​​were set at 2000 rpm, 3000 rpm, and 4300 rpm, and the torque at each rotation range was compared. Differences were observed between the 2000-3000 rpm range and the 4300 rpm range, with an increase in torque particularly in the low rotation range. The above experiment confirmed that the installation of an igniter electrical noise elimination device promotes engine combustion, increases torque in the low rotation range, and makes up for the lack of torque at low speeds. [Explanation of symbols]

[0022] 1 Electrical noise eliminator for igniters 2 Electrical circuit (built into the igniter case) 3 Igniter 3a Igniter Case 4 ignition coil A Heat-resistant sheet B. Electromagnetic wave absorbing sheet (for low frequencies) C. Electromagnetic wave absorbing sheet (for low frequencies) D. Electromagnetic wave reflective sheet E Electromagnetic wave absorbing sheet (for high frequency) F. Adhesive sheet (double-sided tape)

Claims

1. An igniter electrical noise removal device that removes electrical noise from an igniter that constitutes a part of an ignition device of a gasoline engine, The device has a sheet-like device body that is fixed to the outer surface of an igniter case that houses an electric circuit by adhesive, double-sided tape, or a fastener; the device body has an electromagnetic wave absorbing sheet that absorbs electromagnetic waves and an electromagnetic wave reflecting sheet that reflects electromagnetic waves, The electromagnetic wave reflection sheet is positioned on the outer side, farther from the igniter case than the electromagnetic wave absorption sheet, and is laminated on the electromagnetic wave absorption sheet.

1. An electrical noise elimination device for an igniter.

2. The device body is formed by laminating an electromagnetic wave absorbing sheet having the property of absorbing high-frequency electromagnetic waves and an electromagnetic wave absorbing sheet having the property of absorbing low-frequency electromagnetic waves.

2. The electrical noise eliminator device for an igniter according to claim 1.

3. A plurality of electromagnetic wave absorbing sheets having the property of absorbing low frequency electromagnetic waves are stacked on the outer side of an electromagnetic wave absorbing sheet having the property of absorbing high frequency electromagnetic waves.

3. The electrical noise eliminator device for an igniter according to claim 2.

4. A plurality of the electromagnetic wave absorbing sheets are provided, and the electromagnetic wave reflecting sheet is interposed between the electromagnetic wave absorbing sheets, The electromagnetic wave absorbing sheet arranged on the inner side, closer to the igniter case than the electromagnetic wave reflecting sheet, has the property of absorbing high frequency electromagnetic waves, and the electromagnetic wave absorbing sheet arranged on the outer side, farther from the igniter case, has the property of absorbing low frequency electromagnetic waves.

2. The electrical noise eliminator device for an igniter according to claim 1.

5. The outer surface of the device body, which is the surface farther from the igniter case, is covered with a heat-resistant sheet made of a material more heat-resistant than the outer surface.

2. The electrical noise eliminator device for an igniter according to claim 1.

6. The device body is fixed to a flat portion on the outer surface of the igniter case, the flat portion being close to the electric circuit.

2. The electrical noise eliminator device for an igniter according to claim 1.

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