JPS62168966A - Ignition distributor for internal combustion engine - Google Patents

Abstract

PURPOSE:To attempt the employment of a distributor which is a small size and light in weight while erroneous ignition is being prevented by arranging a magnetic flux detecting means at a place opposite to a rotor mounted on a distributor shaft and by providing a control circuit in energizing the primary coil of an ignition coil. CONSTITUTION:A drive shaft 4 is rotatably installed in the inside of a distributor main body 1 wherein a distributor shaft 6 is connected with the drive shaft 4. And a rotor 10 is mounted on the distributor shaft 6. Then a magnetic reluctance element 13 which outputs a detected signal upon sensing magnetic flux, is arranged at a place opposite to the outer circumferential surface 10b of the rotor 10. Furthermore, a control circuit 15 which controls electricity in energizing the primary coil of an ignition coil 18, the distributor of a small size and light in weight with improved resistance to vibration can be employed while preventing erroneous ignition.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an ignition power distribution device for an internal combustion engine, and more particularly to an ignition power distribution device integrated with an ignition coil, which is provided with an ignition coil and an energization control circuit for the ignition coil. be.

[Conventional technology]

In recent years, there has been a demand for ignition power distributors for internal combustion engines for vehicles to improve mountability and electrical connection in vehicles, and in order to meet this demand.

For example, what is shown in U.S. Pat. No. 3,888,225 is that a rotation signal generation means for controlling energization of an ignition coil is arranged concentrically with the rotation axis of an ignition distributor, and a power distribution cap provided on the upper part of the ignition distributor is provided with an ignition coil. The coil is placed.

However, in such an ignition distributor, the relatively heavy ignition coil is placed at the top of the distributor body, so
The center of gravity of the entire power distribution device is higher than the attachment part to the internal combustion engine, resulting in poor vibration resistance.Also, in order to prevent the leakage magnetic flux of the ignition coil from having an adverse effect on the rotation signal generation means, the ignition coil is It is necessary to form a gap in the main magnetic flux axis in the closed magnetic circuit core by shifting a predetermined position, and the mounting position of one ignition coil is limited.

Therefore, recently, as shown in, for example, Japanese Patent Publication No. 60-18834, a power distribution device in which an ignition coil is disposed on the side inside the main body has been put into practical use.

[Problems to be Solved by the Invention] However, although this ignition coil mounting method lowers the center of gravity of the power distributor body and improves vibration resistance, the rotation signal generating means housed together with the ignition coil does not produce a signal. Since it uses an electromagnetic induction method that detects changes in magnetic flux as the rotor rotates and controls the energization of the ignition coil, similar to the conventional example described above, leakage magnetic flux is induced when the ignition coil is cut off. In order to prevent the influence of this noise, the rotation signal generating means must be moved to a predetermined location that is not affected by the leakage magnetic flux of the ignition coil. Therefore, the relative position of the ignition coil and the rotation signal generating means is restricted, and the shape, size, etc. of the power distributor are restricted.

The present invention has been made in view of one or more points, and an object of the present invention is to accommodate the ignition coil, the rotation signal generating means, etc. without any restrictions on the arrangement of these parts, and to provide an ignition coil, rotation signal generating means, etc. An object of the present invention is to provide a highly reliable ignition coil-integrated ignition power distribution device that does not cause ignition malfunctions due to the influence of leakage magnetic flux.

[Means for solving problems]

The present invention has been developed because rotation signal generation means for controlling energization of an ignition coil using an electromagnetic induction method used in a conventional ignition power distribution device is easily affected by noise due to leakage magnetic flux generated when one ignition coil is energized or cut off. Instead, the desired objective is achieved by using an ignition coil energization control means that is not affected by the leakage magnetic flux of the ignition coil.

That is, in the present invention, a rotating body having a number of magnetic parts corresponding to the number of cylinders of an internal combustion engine provided at equal intervals on its outer circumferential surface is attached to a power distribution shaft of a power distribution device main body, and a rotating body is mounted opposite to the outer circumferential surface of the rotating body. A magnetic detection means that outputs a detection signal when sensing a magnetic flux is arranged at a position where the magnetic flux is detected, and the magnetic detection means has a magnetic sensitivity level characteristic that is not sensitive to a magnetic flux as large as the leakage flux of the ignition coil. The magnetic flux applied from the magnetic part of the rotating body to the magnetic detecting means is set to be greater than the magnetic sensitivity level of the magnetic detecting means, so that the magnetic flux applied to the magnetic detecting means is configured by a detecting element, and when the rotating body rotates, the magnetic flux is It is set to output a detection signal (if signal) in response to the absolute amount of magnetic flux applied from the magnetic section, and furthermore, the ignition coil is set to be outputted in response to the absolute amount of magnetic flux applied from the magnetic section, and the ignition coil is set to be outputted in response to the absolute amount of magnetic flux applied from the magnetic section. a control circuit for controlling energization of a primary coil;
A secondary coil and an ignition coil having a secondary coil are arranged.

[Effect]

According to the present invention having such a configuration, the magnetic detection means periodically detects the magnetic flux of the magnetic part of the rotating body during rotation of the power distribution shaft, outputs a detection signal, and detects the ignition coil based on this detection signal. The primary coil is controlled to be energized, and when the primary coil is de-energized, a high voltage is induced in the secondary coil and distributed to the 9 spark plugs.

Although leakage magnetic flux is generated from the ignition coil when the primary coil is energized or cut off, the magnetic detection means in the present invention is not sensitive to the leakage magnetic flux, but is sensitive to and detects only the absolute amount of magnetic flux of the magnetic part. Since the signal is output, the detection signal is not affected by noise due to leakage magnetic flux of the ignition coil, and accurate primary coil energization control and ignition operation control without malfunction can be performed.

Therefore, one ignition coil and magnetic detection means (rotation signal generation means) can be used without considering the influence of leakage magnetic flux of the ignition coil.
It can be housed and incorporated inside the power distributor main body.

〔Example〕

An embodiment of the present invention will be explained based on FIGS. 1 to 5.

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a plan view of the magnetizing drum used in this embodiment. In the figure, 1 is the main body of the power distributor, and 2 is a power distribution cap attached to the upper side of the main body 1 of the power distributor.

A shaft insertion portion 3 is provided protruding from the bottom side of the power distributor main body 1, and a drive shaft 4 for driving the power distributor is rotatably inserted into the inside of the power distributor main body 1 through the shaft insertion portion 3. A gear 5 is provided at the lower end of the drive shaft 4, and the rotational force of an internal combustion engine (not shown) is transmitted through the gear 5, so that the drive shaft 4 rotates in proportion to the speed of the internal combustion engine. Further, a power distribution shaft 6 is fitted into the upper end of the drive shaft 4, and this power distribution shaft 6 is connected to the drive shaft 4 via a rotation advance mechanism 7, so that the engine rotational speed increases as the drive shaft 4 rotates. 68 is a power distribution rotor provided at the upper end of the power distribution shaft 6, which rotates at a controlled speed in proportion to , and has rotor electrodes on its upper surface for sequentially distributing the secondary voltage of the ignition coil 18 to spark plugs (not shown), which will be described later. 9 is provided.

10 is a magnetized drum (rotating body) for generating one rotation signal, and its arrangement! Arranged to rotate together with 1lfll16! ! ! It is pivotally attached to the shaft 6. This magnetized drum 10 has an aluminum plate-shaped non-magnetic member 10a formed into a drum shape, and a magnetic paint 11 is coated on the outer peripheral surface 10b of the non-magnetic member 10a, and the magnetic coating 11 is shown in FIG. The number of magnetic recording parts (magnetic parts) 12 corresponding to the number of cylinders of an internal combustion engine is pre-magnetized by a magnetic recording head at equal intervals, alternating with N poles and S poles. In this embodiment, the internal combustion engine has four cylinders, and the magnetic recording sections 12 have four cylinders.
Set it so that it is equally spaced.

Reference numeral 13 denotes a magnetic resistance element disposed inside the power distributor main body 1 so as to face the outer circumferential surface 10b of the magnetized drum 10. An element having a sensitivity level characteristic that is not sensitive to magnetic flux is used, and the magnitude of the magnetic flux of the magnetic recording section 12 described above is set to be equal to the magnetic sensitivity level characteristic of the magnetoresistive element 13. When the magnetoresistive element 13 rotates and passes through the magnetic recording section 12, the magnetic recording section 12
The magnetic detection signal is output in response to the absolute amount of magnetic flux.

14 is a magneto-electric conversion pickup that converts the detection signal of the magnetoresistive element 13 into an electric signal and shapes the waveform.

15 is an ignition coil energization control circuit connected between a battery (not shown) and the primary coil side of the ignition coil 18; Based on ignition coil 18
This is to control the energization intermittently. The ignition coil energization control circuit 15 and the magnetoelectric conversion pig-up 14 are integrally formed as a unit on the magnetoresistive element 13, and the support member 1
6, and the unit thus formed is supported so as to be movable in the radial direction of the power distribution 4i1116 via a position adjustment mechanism (not shown). Magnetized drum 10 and magnetoresistive rope 1
This allows the gap G between 3 and 3 to be adjusted.

Reference numeral 18 denotes an ignition coil, and the ignition coil 18 is disposed at an appropriate position inside the power distributor main body 1.

For example, as shown in FIG. 4, the ignition coil 18 has E-type iron cores 18a and 18b facing each other to form a closed magnetic path, and a gap is formed in the central portions 18c and 18d.
The secondary coil is formed by winding and molding a secondary coil, and a high voltage terminal 19 of the secondary coil is disposed above the ignition coil 18.

20 is a brush provided on the inside upper part of the power distributor cap 2 so as to be in contact with the high voltage terminal 19; 21 is a conductive Yd path; 22 is a brush that is in contact with the rotor electrode 9; 2; 3 is a brush disposed opposite to the rotor electrode 9; A fixed electrode is provided, and a fixed tti pole 23
are arranged at regular intervals in the same number as the cylinders of the internal combustion engine, and the secondary voltage induced in the ignition coil 18 is sequentially distributed to each fixed electrode 23 via the conductive path 21, the brush 22, and the rotor electrode 9. This will be supplied to the spark plug of the internal combustion engine via the high pressure tower 24. Next, the operation of this embodiment will be explained.

When the power distribution shaft 6 rotates in proportion to the rotation of the drive shaft 4, the magnetized drum 1o and the power distribution rotor 8 rotate together with the power distribution shaft 6, and the rotation of the magnetized drum 10 causes the magnetic recording section 12 to sequentially record magnetic resistance. The element 13 rotates while being applied, and when passing through the magnetic recording section 12, the resistance value of the magnetoresistive element 13 changes in response to the absolute amount of magnetic flux, and the magnetoelectric transducer pickup 14 outputs a magnetic detection signal to activate the ignition coil. A control circuit 15 controls energization of the primary coil by the battery.

FIGS. 3(,) to 3(d) show operational waveform diagrams during such ignition coil control.

As shown in FIG. 3(a), 1. When the magnetic recording section 12 passes through the installation part of the magnetoresistive element 13 due to the rotation of the flat drum 10, the absolute amount of the magnetic flux B is detected at the time of passing.
The voltage 1 of this detection signal is shaped into a waveform as shown in FIG. , while passing through the magnetic recording section 12, a current i as shown in FIG. 3(Q) periodically flows through the primary coil. Then, at a time point t2 when the magnetic recording section 12 passes, the primary current i is cut off, and a high voltage v2 is induced in the secondary coil as shown in FIG. 3(d). This high voltage VZ is applied to the distribution rotor 8
is applied to the spark plugs of each cylinder of the internal combustion engine via the rotor electrode 9 and fixed electrode 23.

By the way, even though the ignition coil 18 is of a closed magnetic circuit type, it is a well-known fact that leakage magnetic flux is generated from the magnetic circuit, and in the closed magnetic circuit iron core 18.18b as shown in FIG.
The leakage magnetic flux is radiated radially from the center 0 of one iron core 18a and converges approximately at the center 0 of the other iron core 18b. This leakage magnetic flux extends to the surroundings of the magnetic detection element 13, but since the magnetoresistive element 13 has a magnetic sensitivity level characteristic that is not sensitive to leakage magnetic flux, the magnetic resistance element 13 It is possible to output an appropriate detection voltage vi in response to only the absolute amount of , and perform energization control of the ignition coil without malfunction.

Note that in order to make the magnetoresistive element 13 sensitive to only the absolute amount of magnetic flux of the magnetic recording section 12, the absolute amount of the magnetic flux B applied from the magnetized drum 10 to the magnetoresistive element 13 is set to be higher than the leakage flux of the ignition coil 18. It is only necessary to make it sufficiently large, and in this way, it is possible to prevent the adverse effects of leakage magnetic flux that occurs when the ignition coil 18 is de-energized.

As a means to increase the magnetic flux B applied to the magnetoresistive element 13, for example, it is sufficient to reduce the gap g between the magnetized drum 10 and the magnetoresistive element 13, or to strengthen the magnetic force of the magnetic flux of the magnetic recording section 12. , in this way the magnetoresistive cord 1
The magnetic field applied to 3 can be easily set to more than [number]-0 Gauss.

On the other hand, the leakage magnetic flux induced when the ignition coil is de-energized can reach 1 Gauss even in the vicinity of one ignition coil because the primary ttt current in the ignition coil 18 is about several amperes. do not have. For example: +: The magnitude of the magnetic field generated by a 1.1 OA DC current at a position 2.51 degrees away from the current is 0.8 Gauss 8 degrees.

Furthermore, since the magnetoresistive element 13 does not respond to magnetic flux in the Y direction in FIG. With this arrangement, the magnetoresistive element 13 becomes less susceptible to the adverse effects of the ignition coil's leakage flux during one day.

Therefore, according to this embodiment, problems such as ignition malfunction will not occur even if the ignition coil is affected by leakage magnetic flux, and the ignition coil and magnetoelectric conversion pickup can be installed without any restrictions on their shape or arrangement. As a result, parts such as the ignition coil and magnetization conversion pickup can be efficiently mounted on the lower side of the power distribution device body, lowering the center of gravity of the power distribution device and improving vibration resistance. Since this can be done without being subject to space constraints compared to the TII distribution device, it is possible to increase the mounting density of components within the power distribution device and achieve effects such as making it possible to reduce the size and weight of the power distribution device.

Although this embodiment uses a magnetoresistive element as the magnetic detection means, a Hall element or the like may also be used. Furthermore, the same effect can be obtained by disposing permanent magnets in place of the magnetic recording section 12 made of magnetized magnetic paint on the outer circumferential surface 10b of the magnetized drum 10 in accordance with the number of cylinders.

〔Effect of the invention〕

As described above, according to the present invention, there is no relative restriction on the arrangement of the ignition coil, magnetic detection means, etc., so there is no need to place these parts within the main body of the power distribution device. It is possible to provide a highly reliable ignition power distribution device that can be installed without any problems, can be made smaller and lighter in size, has improved vibration resistance, and does not cause malfunctions in the energization control of the ignition coil.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, FIG. 2 is a plan view of a magnetized drum used in the above embodiment, and FIG.
) to (d) are signal waveform diagrams explaining the operating state of the above embodiment, FIG. 4 is a schematic diagram of the closed magnetic circuit core of the ignition coil J'+4 in the above embodiment, and FIG. FIG. 2 is a perspective view illustrating a magnetically sensitive direction of a magnetoresistive element used in an example. DESCRIPTION OF SYMBOLS 1... Power distributor body, 2... Power distribution cap, 4... Drive shaft, 6... Power distribution shaft, 8... Power distribution rotor, 9... Rotor electrode, 10... Magnetized drum (rotating body) ), 10b...
・Drum outer peripheral surface, 11...Magnetic paint, 12...Magnetic recording section (Magnetic 15...Ignition coil energization control circuit, 18
...Ignition coil, 23...Fixed electrode for power distribution.・-1・ Reference I Diagram Stem 3

Claims (1)

[Scope of Claims] 1. A power distribution shaft that rotates in proportion to the rotation of the internal combustion engine, a power distribution rotor that rotates together with the power distribution shaft, and a rotor of the power distribution rotor are disposed inside a power distribution device body covered with a power distribution cap. In an ignition distributor comprising a fixed electrode for distributing secondary voltage of an ignition coil supplied from the electrode to each spark plug of an internal combustion engine, the distribution shaft is provided with a number of magnetic parts corresponding to the number of cylinders of the internal combustion engine. Rotating bodies arranged at equal intervals on the outer circumferential surface are pivoted,
A magnetic detection means that outputs a detection signal when sensing magnetic flux is disposed at a position facing the outer peripheral surface of the rotating body, and this magnetic detection means is capable of detecting a magnetic flux as large as the leakage flux of the ignition coil. The magnetic flux is applied from the magnetic part of the rotating body to the magnetic detecting means to a level greater than the magnetic sensitive level of the magnetic detecting means. The detection means is set to output a detection signal in response to the absolute amount of magnetic flux applied from the magnetic section when the rotary body rotates, and further, the detection means of the magnetic detection means is provided inside the power distributor main body. A control circuit for controlling energization of the primary coil of the ignition coil based on a signal is provided, and the ignition coil having a primary coil and a secondary coil is installed in a part of the inside of the power distributor body. Ignition distributor for internal combustion engines. 2. The ignition power distributor for an internal combustion engine according to claim 1, wherein the magnetic detection means uses a magnetoresistive element.