JPS58211573A - Noise preventive type ignition device - Google Patents

Abstract

PURPOSE:To prevent a high-frequency noise current from flowing out and suppress the generation of noise by connecting a plug, an ignition coil and a distributor by means of a noise preventive type high-tension calbe and providing a resistor at an intermediate part of a rotor electrode. CONSTITUTION:A long resistance plug 1 is provided in each cylinder, and each plug is connected to a corresponding stationary electrode 17 by means of a noise preventive type high-tension cable 13. The long resistance plug 1 has a monolithic resistor 7 having a length l of 8mm. or more, preferably about 15mm.. In addition, the central electrode 16 of a distributor 24 is connected to an ignition coil 27 by a noise preventive type high-tension cable 28. A dielectric 25 such as silicone glass or the like is fixed by caulking 26 to at least one of the upper part and the lower part of the rotor electrode 21 of a rotator 22. Further, a winding type or carbon film type resistor 29 of about 5-20kOMEGA is inserted into the intermediate part of the rotor electrode. By this arrangement, a high-frequency noise current is prevented from flowing out and the generation of a noise field is reduced.

Description

[Detailed description of the invention]

The present invention also applies to an ignition system for an internal combustion engine (A)! +! j
'vr - Radiation of radio wave noise of number at radio frequency θ1ijJ+
I-, l~f, miscellaneous 1, prevention 11'~ ignition system-r
Ru. An automobile ignition system consists of a distributor, spark plug, high-voltage cable, etc., but when a spark discharges in the distributor and spark plug, a large current with a steep rise time flows, and this device generates noise radio waves that interfere with communication. . Such noise radio waves have become a serious social problem as the number of cars increases, and some countries have enacted regulations regulating radio noise from cars. In this situation, it is necessary to reduce this radio noise, that is, noise prevention 1.
As a countermeasure against this, a resistor is enclosed in the ignition glove, and a resistor is inserted into the high-voltage cable. Things are heading in a serious direction, and the situation is such that the measures listed above are not enough.
For example, the gap between the rotor electrode and the fixed upper pole is wider than the conventional one, and the gear knob and the number of rotor electrodes are wider! Gold elliptic acid f1' on the surface, ruptured membrane of the object? However, even with these, the noise prevention effect is still insufficient (furthermore, wide gaps have a large energy loss in the gap, so they require a higher voltage than conventional ignition systems). 1. There are problems other than wave noise, such as making it difficult to prevent leaks. 1. To solve the above problem, the present applicant et al. In other words, it is constructed by combining a distributor with a 711 body (f) addition part, a resistor-containing plug (hereinafter referred to as "long-resistance guraku") with a resistor length significantly longer than the conventional resistor length, and a resistor-containing high-voltage cable. Noise prevention 1), which has a large effect on noise prevention at a low cost, has a negative impact on engine performance. 101265)
are doing. However, even in the device described in 1-, JI! fl Kawacho ζ) Depending on the shape of the intended use and East Germany, the noise protection effect of -C may be somewhat poor, especially in the relatively low frequency band of about 207-100 Mllz. Effect or lack of -4
To be clear, the present invention has been made to solve the problem described in 1-1 above, and provides a noise-proof top-type ignition device that has a sufficient noise prevention effect in all frequency bands. The purpose of the present invention is to achieve the above-mentioned purpose.The present invention achieves the above-mentioned object by applying a resistor with a resistance of approximately 5 to 20 Ω at the intermediate portion (near the intermediate portion is sufficient) of the rotor electrode of the rotor with a dielectric material. By providing a resistor, the high-frequency noise current flowing through the ignition coil through the high-voltage cable is attenuated, and the generation of noise radio waves is suppressed.This will be explained in detail below based on the drawings. First, the above-mentioned device applied by the present applicant and its problems will be explained. Fig. 1 is a partial sectional view of the device described in 1). The noise-proof top type ignition device shown in Fig. One long resistance plug for each cylinder of the internal combustion engine used in the ignition system.
and a fixed electrode 17 corresponding to the valley ignition grag,
a distributor 24 having a rotor t21 which rotates in time-coordinated relation with the sensor and is positioned so as to approach each of the plurality of fixed IE poles 17 and pass through; Also, a noise-preventing high-voltage cable 13 is connected between the fixed electrode 17 and the corresponding long-resistance grag 1, and a center electrode 16 and the ignition coil 27 are connected. A noise-preventing high-voltage cable 28 is provided. Each part will be explained in detail below. First of all, spark plugs do not affect the engines they work with @I
This ignition device is provided for each cylinder of an internal combustion engine.This ignition device is provided for each cylinder of an internal combustion engine. Although only one long resistance plug 1 is shown in Fig. 1, the other long resistance plugs are also similar. portion 2, a constant discharge electrode 4 fixed to this lower edge, a monolithic resistor 7, and a center electrode 8? t(1, this flag is a monolithic plug with a general resistor/,
/ri
/CL 1 This is a feature. Nao 6. 3 is a side electrode, 5 is a seal ring, 6 is a sealing material, and 9 is an axial head camp. The noise prevention effect of this plug with a resistor is thought to be due to the capacitance between the monolithic resistor 7 and the plug screw part 2 and the filtering effect of the monolithic resistor 7, but the actual monolithic resistor 7 contains a parallel capacitance. High-frequency current flows to the side of the plug through this parallel capacitance or the capacitance between the spark plug and the plug, reducing its effectiveness as a filter. If the resistance material is the same, this parallel capacitance has a resistance length tIJ
″-The smaller it is, the more realistic it is, the length is 12 to 15 rI.
This effect becomes noticeable at around rIII.Next, the distributor 24 has a shaft 14.rubber, top 15.center electrode 161, fixed electrode 17.pi.18.contactor 19.rotor electrode 21.rotor 22, A″ Yanog 2
3FA'tk body 25. Caulking part 26 or 1
, and 20 is a discharge camp between the rotor electrode 21 and the fixed electrode 17. +11b 14 is connected by a gear to the camshaft of the internal combustion engine with which it cooperates. It rotates in synchronization with the engine, and is positioned at position 5 so as to sequentially approach and pass the fixed electrode 17 corresponding to each spark plug. Further, as shown in FIG. 1, a rotor in which a dielectric material 25 (added only to the bottom end portion in FIG. 1) is added to at least one of the end portion or the bottom end portion (of the rotor electrode 21) is called a dielectric-added rotor. In general, there is a strong correlation between the noise radio waves generated by the discharge 111. and the discharge voltage, as shown in Figure 2. When the above-mentioned dielectric added rotor is used, the radiation I in the gearing 20 between the rotor electrode 21 and the fixed electrode 17 is reduced by a small amount, and the generation of noise radio waves can be greatly suppressed1. In the journal Karota, "J-Yudenken 21 and (
7 is made of stainless steel or broken copper ￥Fv, and frost protection; Body 25 is made of silicone thread. ') K Among them/Recon glass and 11・YB 1164A ＠1廿 Suppression H
ill Young Song, heat resistant. Best in terms of cutting properties, arc resistance, corona resistance, etc. This silicon glass is made by impregnating or coating a base material such as glass fiber with a silicone resin such as silicone glass and then hardening it. For example, if stainless steel with a thickness of 0.6 mm is used as the rotor electrode 21 and silicon glass with a thickness of 0.5 mm is used as the dielectric material 25, the air flow in the gap 20 may be
It has been experimentally confirmed that the capacitance pressure is 4 to 5 KV, and the noise electric field strength is reduced by about 15 dB compared to ordinary brass rotor electrodes. Next, a noise-proof high-voltage cable 13 is connected between the fixed electrode 17 and the long resistance grag 1, and a noise-proof upper high-voltage cable 2 is connected between the center electrode 16 and the secondary winding of the ignition coil 27.
Connected by 8.゛This noise-preventing high-voltage cable is called a resistance string commercial voltage cable, and is covered with a braided wire 12 and an insulating system 11, which are insulators.
This carbon-impregnated wire 10 is made of carbon-impregnated wire 10, and has a resistance of 07 m between 8 and 20. Figure 3 shows the combination of ignition plugs, distributors, and high-voltage cables with the above-mentioned noise-proofing measures taken and those without measures, and the measurement results are shown in Figure 4. In FIG. 5, T in parentheses indicates no countermeasure, and A-1) corresponds to A-1) in FIG. In addition, the measurement results shown in Figure 4 are for the 7Q installed in a bonnet-type passenger car.
Measured by installing an ignition device on a 1500cc internal combustion engine.1
This is the result. Also, E indicates the level of regulations. As can be seen from Figure 4, if there is a part without countermeasures even in 11al locations (A, 13.C), the overall level is determined by the largest noise component generated from the part without countermeasures, so the noise The inhibitory effect will be significantly reduced. Then - (if all three measures are taken 1), only in case (1)) 1゛0~-) 0 (the thickness of the group @L can be suppressed 14
) 1゜The results in Figure 4 show that all 11♂ISRs have been taken countermeasures.
2 Cases 1) Odor-C is above the regulatory level. However, in the low frequency range of 20 to 1.00 Mllz. It can be seen that there is little leeway to change the legal regulation level. Next, FIGS. 5(a) and 5(b) are diagrams showing the measurement results in the case of a truck, and (a) is a diagram showing the measurement results for 4 cycles of 2000 c.
In the case of a cab-over type truck equipped with a 4-cycle 1500cc internal combustion engine, (0) shows the case of a two-box bonnet type truck equipped with a 4-cycle 1500cc internal combustion engine Z. As can be seen from Fig. 5, even if all measures are taken, depending on the vehicle type, 20~100M117. The low frequency range may exceed the legal regulation level Ef. It is necessary to further improve the noise suppression effect at t4.
+ro. There are no details as to why the noise level is so high in the case of the 1 car model shown in Figure 5. However, it is probably related to the shape of the vehicle, the height of the internal combustion engine, etc. 1. Lower the noise 'radio waves around 20-100M1lZ' described in 1-1. I performed the analysis of the gods at this time.The result is the following.'14j Akira L Tko. Door installation rib, L-evening rotor' electrode 21 and fixed electrode 1
The high-frequency noise current caused by the spark discharge voltage between the fixed electrode 17 and the spark plug 1 is generated by the noise-preventing high-voltage cable 1 between the fixed electrode 17 and the spark plug 1.
3 and a noise-proof high-voltage cable 28 between the center electrode 16 and the ignition coil 27. As a result, noise radio waves are radiated using the 9-way noise-proof high-voltage cable 13.18 as a kind of antenna. However, the noise-preventing high-voltage cable 13 is generally 60 to 70 cm long, and one end is ultimately grounded through the long resistance plug 1, so the attenuation of the noise current is limited. Furthermore, since the effective length of the antenna is short, the generation of noise radio waves is sufficiently reduced. However, the noise-proof high-voltage cable 28 is generally short (about 30 cm) in length (and has a low-resistance ignition coil 27 at its tip and a primary side gate (the primary winding of the ignition coil and the battery). The noise that was not attenuated by the high-voltage cable 28 is connected to the ignition coil 27. or 1°)
It flows to the primary lead wire and has a long wavelength of 20 to 100.
Since there is little attenuation near t'v111z, noise radio waves are radiated using the ignition coil and lead wire as antennas. The present invention has been made based on the above consideration, and by providing a barrier at the intermediate portion of the rotor' electrode of the dielectric-added rotor, the noise current flowing to the noise-preventing high-voltage cable 28 is attenuated. It's a small thing. FIG. 6 is a diagram showing one embodiment of the rotor of the present invention. The same reference numerals as in FIG. 1 indicate the same parts. In FIG. 6, reference numeral 29 denotes a resistor inserted into the middle portion of the rotor electrode 21, and for example, a wire-wound type resistor or a carbon film type resistor can be used. Also, the resistance value of the resistor 29 is 5
~2 OKΩ approximately. Ignition energy transmitted from the ignition coil through the contact 19 passes through the resistor 29 and is transmitted to the discharge end (tip) of the rotor electrode 21. According to the present invention, a kind of RC
By forming a filter and thereby attenuating the high-frequency noise current and reducing the noise current flowing through one ignition coil 2 and the lead wire beyond it, noise radio waves can be suppressed. FIG. 7 is a diagram showing actual measured values of noise electric field strength when the ignition device of the present invention is used, and is (a) in FIG. The measurement conditions for (middle) correspond to (a) and (middle) in Fig. 5. W, In Fig. 7, 1) has the same characteristics as Fig. 5,

【・】
indicates the legal regulation level, and F indicates the characteristic of the present invention. Note that the characteristics shown in FIG. 7 are as follows:
This shows the case where a wire-wound resistor is used. Furthermore, it has been confirmed whether the noise prevention effect will be further improved if the contactor 19 is made of ceramic fukusu or the like (resistance barbs). From FIG.
o Ml17. It is possible to reduce the noise level in the area and bring it to a value well below the legal regulation level by 1 shin. As described in 1-1, in the present invention, the W wave noise is generated from one ignition device, or is generated from each of the distributor, spark plug, and Ichikawa cable that make up this ignition device a, and is further radiated from these individual parts. The maximum electric field strength of 1 IIL wave noise or 7 + radio wave noise is,
Focusing on the fact that the radio noise emitted from these individual parts is dominated by the largest one, measures to prevent radio noise may be effective even if measures are taken for each of the above individual parts separately. It was confirmed through experiments that countermeasures were needed for the entire system, and measures were taken for all parts to suppress the generation of radio noise across the entire range from the low frequency range to the high frequency range. It has the effect of making things easier.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of an example of a noise prevention type ignition device to which the present invention is applied, Fig. 2 is a relationship diagram between discharge pressure and noise radio wave level, Fig. 6 is a combination diagram of noise prevention measures, Figures 4 and 5 are frequency characteristic diagrams of noise electric field strength, Figure 6 is an embodiment of the rotor of the present invention, and Figure 7 is a frequency characteristic diagram of noise electric field strength, with explanations of the various 1° signs. 1...Long resistance glug 2...Glug screw part 5.
...Side electrode 4...Emission TFT electrode 5...
Seal ring 6...Seal material 7...Monolithic resistor 8...Center electrode 9...Shaft head cap
10... Carbon impregnated wire 11... Insulating sheath
12... Braided wire 13... Noise prevention type high voltage cable 14... Shaft 15... Rubber cap 16... Center electrode 17... Fixed electrode 18.
... Spring 19 ... Contact 20 ... Discharge gap 21 ... Rotor electrode 22 ... Rotor 23 ... Cap 24 ... Distributor 25 ... Dielectric 26 ... Caulking part 27
...Ignition coil 28...Noise-preventing cylinder pressure cable 29...Resistance body representative patent attorney Junnosuke Nakamura

Claims (1)

[Claims] It is equipped with a spark plug, a distributor, and a high voltage cable connecting between the large LK plug and the distributor and between the ignition coil and the distributor, and is used as one spark plug in an L two ignition system with a resistance length of 8 mm. A long resistance plug is used as a WfJ voltage cable, and a noise-proof high voltage cable with a resistance is used as a distributor. body r to j addition, ka')
Use a distributor with a resistor between the poles of the rotor 'Ib' and use a distributor with a resistor between the poles! Noise-preventing ignition device with unique features.