JPH06167267A - Electronic advance angle type ignition coil integral type power distributor - Google Patents

Abstract

PURPOSE:To reduce the noise superposed with the output signal of an electromagnetic pick-up by suppressing the influence of the leak magnetic flux supplied from an ignition coil which is given to the electromagnetic pick-up. CONSTITUTION:As for a power distributor having electromagnetic pick-ups 10, 11, and 12, power switching unit 14, and an ignition coil 17 built in, the electromagnetic pick-up 10 is installed on a housing 2, and the electromagnetic pick-ups 11 and 12 are installed on both the sides in the axial direction of a base 5, and all the electromagnetic pick-ups 10, 11, and 12 are arranged at the position symmetrical with the ignition coil 17, for the revolution center of the power distributor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic advance type ignition coil integrated type distributor for an internal combustion engine.

[0002]

2. Description of the Related Art Due to demands for miniaturization and integration of parts of an electronic advance ignition system for an internal combustion engine, it is known to arrange an electromagnetic pickup, a power switching unit and an ignition coil together in a distributor. . For example,
The official skill number 89-19448 can be mentioned.

With the above-mentioned structure, a plurality of electromagnetic pickups which output as a rotation signal are required in view of the function of the ignition system. Conventionally, the electromagnetic pickups are individually assembled in the housing and the bearing base.

In accordance with this, a plurality of signal rotors are independently mounted on the shaft. Some of the electromagnetic pickups detect a change in magnetic flux by a rotating signal rotor, generate a signal, and transmit the signal to a control unit on the engine side via a lead wire extending from the electromagnetic pickup. The control unit processes this input signal and inputs the ignition signal to the power switching unit in the distributor via the lead wire, and the power switching unit flows to the primary coil of the ignition coil by this signal. Interrupts the existing primary current.

When the primary current is cut off in the ignition coil,
Generate a high voltage in the secondary coil.

[0006]

In the above-mentioned prior art, the magnetic flux leaking from the inside of the ignition coil diverges to the surroundings at the moment when the primary current of the ignition coil is cut off, and the magnetic flux is interlinked with the electromagnetic pickup to pick up the pickup signal. Occurs as noise, and if this noise is input to the control unit on the engine side, there is a problem that malfunction occurs.

An object of the present invention is to provide a highly reliable power distributor which does not have the above problems, that is, has a small amount of noise superimposed on a pickup signal.

[0008]

The above object can be achieved by the following constitution. That is, all of the plurality of electromagnetic pickups are arranged at positions symmetrical to the ignition coil with respect to the rotation center of the distributor.

In order to make this possible, one electromagnetic pickup is attached to the housing and one electromagnetic pickup is attached to each side of the bearing base in the axial direction.

[0010]

[Operation] Each signal rotor that rotates integrally with the shaft,
When the signal rotors and the electromagnetic pickups face each other, the voltage generated in each electromagnetic pickup is output to the control unit on the engine side. The control unit processes this input signal and inputs the ignition signal to the power switching unit via the harness.

Based on this input signal, the power switching unit controls the primary current from the battery flowing in the primary coil in the ignition coil. The ignition coil generates a high voltage in the secondary coil inside the ignition coil when the primary current is cut off. This high voltage is applied to the spark plug of each cylinder of the engine through the center electrode of the cap, the rotor head, and the side electrode of the cap.

Here, at the moment when the primary current is cut off, magnetic flux leaks from the ignition coil to the surroundings, and this magnetic flux interlinks with the pole pieces of each electromagnetic pickup, so that noise is superimposed on the pickup signal.

In order to reduce the interlinkage of the leakage magnetic flux with the pole pieces of each electromagnetic pickup, the magnetic flux is interlinked orthogonally with the pole pieces of each electromagnetic pickup, and the leakage magnetic flux amount is also reduced. As described above, the respective electromagnetic pickups are arranged at symmetrical positions at the farthest distance from the ignition coil with respect to the rotation center of the distributor.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIGS. 1 and 2, the shaft 1 rotates in synchronization with the rotation of an engine (not shown). The shaft 1
One is a bearing 3 which is connected to the housing 2, the other is integrated with the shaft 1 and is clamped by a retainer plate 4 to a base 5 which is attached to the inner circumference of the upper portion of the housing 2. It is rotatably mounted by a bearing 6.

Signal rotors 7 and 8 are attached to the shaft 1 between the bearings 3 and 6, and a signal rotor 9 is attached to the upper portion of the bearing 6 so as to rotate integrally with the shaft 1. .

Magnetic pickups 10, 11 and 12 which are sensitive to magnetic flux are opposed to the signal rotors 7, 8 and 9, respectively, and change in magnetic flux due to rotation of the signal rotors 7, 8 and 9 is detected, and Electromagnetic pickup 10, 11, 1
A voltage is induced inside 2. This voltage is input to a control unit (not shown) via the harness 13.
The input signal is processed in this control unit,
The ignition signal is input to the power switching unit 14 in the distributor via the harness 13. Based on this signal, the power switching unit 14 causes the primary stay from the battery (not shown) flowing in the primary coil in the ignition coil 17 mounted on the inner stay 15 of the housing 2 together with the magnetic shielding plate 16. Control the current.

When the primary current is cut off, the ignition coil 17 produces a high voltage in the secondary coil in the ignition coil.

This voltage is applied to the center electrode 19 of the cap 18.
And is applied to the spark plug of each cylinder of the engine (not shown) via the rotor head 20 and the cap side electrode 21.

Here, the electromagnetic pickup 10 is fixed to the housing 2 and the electromagnetic pickups 11 and 12 are provided.
Are attached to both sides of the base 5 in the axial direction.

FIGS. 3 and 4 show the arrangement of the ignition coil and the electromagnetic pickup in the distributor, and FIG. 3 shows that the electromagnetic pickup is located in the first quadrant and the fourth quadrant with respect to the axes X and Y with respect to the center of rotation. And each electromagnetic pickup 22, 23
For the pole pieces 24, 25 and coils 26, 27 of
When the primary current of the ignition coil 28 is cut off, the magnetic flux φ outside the ignition coil 28 is different from the magnetic flux φ inside the ignition coil 28.
R leaks.

The magnetic flux φR is applied to the pole pieces 24, 2
By interlinking with 5, the electromagnetic flux pickup 22,
There is a risk of malfunction if noise is superimposed on the output signal of 23 and is input to the control unit on the engine side. Therefore, as shown in FIG. 4, the electromagnetic pickups 22, 2 are
By arranging 3 on the X axis symmetrical to the ignition coil 28, it becomes the farthest from the ignition coil 28,
The magnetic flux φR itself interlinking with the electromagnetic pickups 22 and 23 is reduced, and the magnetic flux φR orthogonally interlinking with the pole pieces 24 and 25 becomes the main, and the coils 26 and 27 are
The amount of noise that is sensitive to is reduced.

However, it is not possible to mount a plurality of electromagnetic pickups on the distributor in a position symmetrical with the ignition coil so as to be stacked in a line in the axial direction.

Therefore, by mounting one electromagnetic pickup on the housing and two electromagnetic pickups on both sides in the axial direction of the base, it is possible to arrange them all symmetrically with the ignition coil.

[0025]

According to the present invention, the leakage magnetic flux from the ignition coil is prevented from interlinking without shielding the electromagnetic pickup itself, and further, the pole piece is located at a position orthogonal to the polepiece. By only disposing the electromagnetic pickup, noise superimposed on the output signal of the electromagnetic pickup can be reduced and reliability can be improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a distributor main body without a harness showing an embodiment of the present invention.

FIG. 2 is a plan view in which a cap and a rotor head are removed from a distributor main body.

FIG. 3 is a layout diagram showing a conventional electromagnetic pickup position.

FIG. 4 is a layout view of an electromagnetic pickup showing an embodiment of the present invention.

[Explanation of symbols]

2 ... Housing, 5 ... Base, 10, 11, 12 ... Electromagnetic pickup, 17 ... Ignition coil, 22, 23 ... Electromagnetic pickup, 24, 25 ... Pole piece, 28 ... Ignition coil.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F02P 15/00 303 E

Claims (2)

[Claims] 1. A shaft that rotates in synchronization with rotation of an engine,
A plurality of signal rotors attached to the shaft and rotating integrally with the shaft, a plurality of electromagnetic pickups that generate a signal by detecting a change in magnetic flux accompanying the rotation of the signal rotors, a signal of the electromagnetic pickups Is input to a control unit on the engine side, an ignition signal from the control unit is input to a power switching unit in the distributor, and the power switching unit is a battery flowing in a primary coil of an ignition coil in the distributor. In the distributor for interrupting the primary current from the ignition coil to generate a high voltage on the secondary side of the ignition coil, all of the plurality of electromagnetic pickups are connected to the ignition coil based on the center of rotation of the distributor. On the other hand, the electronic advance type ignition coil integrated type power distributor, which is arranged symmetrically. 2. The electronic advance type ignition coil integrated distributor according to claim 1, wherein the electromagnetic pickups are mounted on both sides in the axial direction of the base holding the bearing of the shaft and in the opposite direction to the base. The electric advance type ignition coil integrated type power distribution device, which is characterized in that