JPH02104976A - Distributor for ignition of internal combustion engine - Google Patents

Abstract

PURPOSE:To enhance the extent of reliability in reducing malfunctions in a signal processing circuit by attaching a cap, with a side electrode, to a housing end, and installing an inductance increment means increasing the extent of inductance in this side electrode. CONSTITUTION:A detecting element 12 consisting of a crank angle sensor and a signal processing means is set up in a housing 1. Plural numbers of cap side electrodes 9 are installed in a cap 7 being detachably installed in the housing 1. Inductance of the side electrode 9 is provided with an inductance increment means 15 consisting of a ferrite ring around a terminal 11. Thus, malfunctions in a signal processing circuit are decreased so that reliability becomes enhanced.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a power distribution device for internal combustion engine ignition.

[Conventional technology]

Figure 3 shows a conventional power distributor of this type, with a housing (1
) is attached to the shaft (2) which is supported through the bushing (
3) A rotor (5) is attached via a blank (4). The rotor (5) is provided with a rotor electrode (6). A cap (7) removably attached to the housing (1) is provided with a plurality of cap side electrodes (9) that form a power distribution gap (8) with the rotor electrode (6). .

The cap (7) is provided with terminals (10) and (11) connected to the coil and the plug, respectively.

Also, inside the housing (1) is a shaft 2).
A detection section (12) consisting of a crank angle sensor and its signal processing means is arranged so as to surround it, and an electromagnetic shielding iron plate cover (13) and an electrostatic Iron plate cover for shield (
14) is provided.

With the above configuration, the rotor (5) rotates together with the shaft (2) that rotates in synchronization with the rotation of the engine, and the rotor electrode (
6) to the cap side electrodes (9) one after another, but at this time, the power distribution gap (8) between the electrodes (6) and (9)
) a spark discharge occurs.

[Problem to be solved by the invention]

In the conventional power distributor configured as described above, unnecessary electromagnetic waves are generated due to the steep capacitive discharge current flowing due to spark discharge in the distribution gap (8), and the iron plate cover for electromagnetic shielding (13) and the electrostatic shielding iron plate cover (1
Although 4) is provided, these alone cannot sufficiently prevent this, and may adversely affect the detection unit (12) consisting of the crank angle sensor and signal processing unit as noise, causing malfunction. There was a problem that there was.

This invention was made to solve the above-mentioned problems, and it is an object of the present invention to obtain a highly reliable power distributor that suppresses the influence of electromagnetic waves caused by spark discharge on a detection section consisting of a crank angle sensor and a signal processing means. With the goal.

[Means to solve the problem]

The internal combustion engine ignition power distribution device according to the present invention is configured to include inductance increasing means for increasing the inductance of the side electrodes.

[Function] The inductance increasing means in the present invention eliminates sudden changes in the secondary current and suppresses the generation of unnecessary electromagnetic waves.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, (15) is an inductance increasing means consisting of a ferrite ring mounted around a terminal (11) connected to a side electrode (9). The other symbols are the same as those of the conventional device, so the explanation will be omitted. In addition,
In the figure, only one of the side electrodes has an inductance increasing means (
15), but in order to maximize the effects of the present invention, it is desirable to provide the inductance increasing means (15) at portions corresponding to all the side electrodes.

In the above configuration, the inductance of the side electrode (9) is increased by providing the inductance increasing means (15) made of a ferrite ring around the terminal (11).

Therefore, when such an embodiment is operated, a spark discharge occurs in the power distribution gap (8), but the side electrodes (
By increasing the inductance of 9), the steepness of the secondary current is suppressed, and when viewed as a waveform, the waveform becomes smoother, and the generation of noise is suppressed, thereby reducing the adverse effect on the detection unit (12). Improved. Therefore, with the same configuration, noise tolerance increases, the probability of malfunctions decreases, and reliability improves. Furthermore, since the noise resistance has been increased, a larger secondary current can be passed. Incidentally, as an example, it was confirmed that the noise tolerance was improved by about 30%. Note that this value is just an example, and it goes without saying that it changes depending on various design quantities.

Note that in the above embodiment, the inductance increasing means (15)
Although a ferrite ring is wrapped around the terminal (11), other materials and installation methods may be used.
For example, as shown in Fig. 2, the terminal (11) and the side electrode (9
), and an inductance increasing means (15) consisting of a helical coil is interposed between the power distribution cap (7
) may be integrally embedded in the mold resin forming the coil.Furthermore, although not shown, an electrical resistor may be used in place of the helical coil shown in FIG.

It should be noted that the above-mentioned embodiment is merely an example shown to facilitate understanding of the present invention, and it goes without saying that various modifications and changes other than those described above can be made within the scope of the spirit of the present invention.

〔Effect of the invention〕

As described above, according to the present invention, in a housing in which a crank angle sensor and a signal processing means are housed, and a cap having a side electrode is attached to the end of the housing, the inductance of the side electrode is The configuration including the increasing inductance increasing means has the effect of reducing malfunctions in the signal processing circuit and providing a highly reliable internal combustion engine ignition power distribution device.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an internal combustion engine addition power distribution device as an embodiment of the present invention, Fig. 2 is a sectional view of main parts showing another embodiment of the invention, and Fig. 3 shows the configuration of a conventional device. FIG. In the figure, (1) is the housing, (7) is the cap,
(9) is a side electrode, and (15) is an inductance increasing means. In addition, the same reference numerals in the drawings indicate the same or corresponding parts of the warehouse 1.

Claims (1)

[Claims] A crank angle sensor and a signal processing means are housed in the housing, and a cap having a side electrode is attached to the end of the housing, and the housing is provided with an inductance increasing means for increasing the inductance of the side electrode. A power distribution device for internal combustion engine ignition featuring: