JPS5885363A - Engine non-contact ignition device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Conventionally, 1: An exciter coil is provided in a magnet generator driven by the h engine, and a capacitor is charged with the positive direction voltage of this exciter coil, and the negative direction KE of the nuclear exciter coil is charged. By turning on and off the thyristor, the charge stored in the capacitor is violently discharged into the primary coil of the ignition coil, and high electrons are induced in the secondary coil of the ignition coil to ignite the engine.This is a so-called capacitor discharge. Contactless ignition devices of this type are well known.

In this type of non-contact ignition device, when the rotational speed of the engine increases to a predetermined rotational speed before the overspeeding state occurs, the means J-1- for preventing overspeeding of the engine is used. There are various methods of temporarily stopping the engine ignition and methods of rapidly retarding the engine ignition angle.
Although the former method has the advantage of being simple and inexpensive, it has the serious drawback of temporarily stopping the ignition of the engine, which releases unburned gas that is harmful to the human body. Although the latter method does not emit unburned gases that are harmful to the human body, it has the drawback that the structure is extremely complicated and the construction cost is high.

The present invention has been made focusing on point F, and its purpose is to attach a signal coil to the same stator core around which an exciter coil is wound around a magnet generator driven in synchronization with the engine. When the engine speed rises to a predetermined speed before overspeeding, the engine's ignition angle is suddenly retarded to prevent engine overspeed. The objective is to provide an excellent non-contact ignition device with a simple structure and low manufacturing cost.

An embodiment of the present invention shown in FIG. 1 will be described below. In this figure, G is a magnet generator that pivots in synchronization with the engine, and this magnet generator G has a magnet rotor M, a stator core B provided opposite to the rotor M, and a magnet generator G that rotates in synchronization with the engine. It consists of an exciter coil E and a signal coil A wound around an iron core B. Part 1: The signal coil A is connected to the first signal coil A1 by providing an intermediate terminal T as shown in the figure.
and a second signal coil. Next, there is a semiconductor circuit section, and this semiconductor circuit section has a thyristor S4.
, C2, S, capacitors C1, C2, diodes D1 to D7, and resistors R1 to R4, and are connected as shown in the figure. Next, ■ is the ignition coil,
This ignition coil consists of a primary coil W1 connected to the semiconductor circuit section K, and a secondary coil W2 connected to the spark plug P of the engine.

In one embodiment of the present invention configured as described above, first, when the engine is rotated manually or by other methods, the magnet rotor M rotates in synchronization with the engine, and the exciter coil wound around the stator core B rotates. The positive direction voltage V El and the negative direction voltage as shown by the arrows in E.

vE2 is generated alternately, and the positive direction voltage V is also generated in the first and second signal coils A1 and ~ as shown by arrows in the figure
A4. , VA2-1 and the negative direction voltage VA12, "2-
2 occur alternately. And that exciter coil E
The waveforms of the positive and negative direction voltages vE1 and vE2 generated in the first signal coil A1 are shown in FIG.
Figure (b) shows the positive and negative direction voltages vg2. generated in the signal coil A2 in Figure 2. , V E22 waveforms are indicated by the dashed line.

Thus, the positive voltage vE1 generated in the exciter coil E charges the capacitor C1 to the polarity shown in FIG. 1 via the diode D2. The waveform of the charging voltage V C of the capacitor C4 is shown by a solid line in FIG. 2(A). On the other hand, the positive direction voltage ■~-4 generated in the second signal coil A2 charges the capacitor C2 via the diode D6, and the charging voltage of the capacitor C2 is
The waveform of 2 becomes as shown by a solid line in Fig. 2 ( ) →, and this is applied to the gate of thyristor S2 via resistor R5, and at the rotation angle e, which reaches the gate voltage g2 of thyristor S2, When the thyristor S2 is turned on, the thyristor S3 is also turned on.

The ON state of these thyristors S2 and C3 continues until the rotation angle 02' at which the charging voltage vC2 of the capacitor C2 becomes lower than the gate trigger voltage FfEvg2 of the λ risk 82 as shown in FIG. As shown in the figure, this rotation angle 02 is determined by the first and second signal coils A1 and A during normal rotation before the engine rotational speed becomes overspeed.
The rotation angle 03 is set to be before the rotation angle 03 at which the next negative direction voltage vA1-2, '', A2-2 occurs.

Therefore, each time a one-way electric coil V A1. When , occurs, the thyristor S3 is in the OFF state as described above, so the voltage is applied to the gate of the thyristor S1 via the diode D7, and the voltage is applied to the gate of the thyristor S1 as shown in FIG.
As shown in FIG.
As shown in b), the charging voltage VC1 of the capacitor C1 is rapidly discharged to the primary coil W1 of the ignition coil E through the thyristor S1 at the rotation angle 03, a high voltage is induced in the secondary coil W2, and the spark plug of the engine is A high-voltage spark is sent to P to ignite the engine.

By repeating the above operations, the engine is ignited at a rotation angle θ3 and rotates on its own. In this case, the negative direction voltage VF6 generated in the exciter coil E is bypassed to the circuit of the resistor R4, and is applied to the gate of the thyristor S1 via the primary coil W1 of the ignition coil and the resistor R4. Therefore, the gate applied electron vE2 becomes low voltage as shown by the solid line in Figure 2 (a),
Gate trigger voltage of thyristor S1 at rotation angle 05 ■g1
When the rotation angle reaches 05, the thyristor S1 is turned on, but since the capacitor C1Fi has already been discharged at this time, the engine does not ignite at this rotation angle 05.

Next, when the rotational speed of the engine increases to a predetermined rotational speed before the overspeeding state occurs, the positive direction voltage of the second signal coil A2 is charged via the diode D6 from the positive direction voltage of the second signal coil A2-11C. The voltage v'C2 is shown in Figure 2 (
C) changes as shown by the broken line. That is, the second
Since the positive direction voltage vA2-1 of the signal coil A2 increases as the rotation speed increases, the charge of the capacitor C2 also changes from vC2 shown by the solid line to v'C2 shown by the broken line,
As a result, the rotation angle at which the thyristors S2 and C5 described above are shifted from the on state to the on state changes from 02 to 03. - Therefore, when the thyristor S is in the on state, the negative direction voltage VA1. of the first signal coil A1. will occur, so this negative direction lightning 1 A1-2 is the thyristor S3.
The current is short-circuited, and no voltage is applied to the gate of thyristor S1 at all, and as a result, the thyristor S1, which had been turned on at rotation angle 64 and ignited the engine, is replaced by the exciter coil E shown in Fig. 2 (a). negative direction voltage vE
At the rotation angle o5 at which the thyristor S1 is turned on at the reduced voltage V''E of 2, the charging voltage of the capacitor C1 is as shown by the broken line v'0.
As shown in 1, the engine will start to ignite. Therefore, the ignition angle of the engine is rapidly retarded to the C shoulder 15, thereby making it possible to prevent the engine from over-speeding.

As is clear from the above description, according to the present invention, an exciter coil and a signal coil are wound around the same stator core provided in a magnet generator driven in synchronization with the engine, and the forward direction of the front exciter coil is A capacitor is charged with voltage, and when the engine is normally rotating, the signal voltage of the signal coil turns on the thyristor, the charge of the capacitor is transferred to the ignition coil, and the engine is ignited, so that the rotational speed of the engine is increased. By disabling the signal voltage of the signal coil when the rotation speed has increased to a predetermined value before entering the overspeed state, the thyristor is turned on by the negative voltage generated in the exciter coil, thereby increasing the speed of the engine. The ignition angle is abruptly adjusted to 1 angle to prevent engine overspeed. Conventionally, this type of device had an exciter coil and a signal coil wound around separate iron cores attached to a magnet generator. Because it is wound around the same stator core without having to wrap it around the stator core, it can be easily advanced and downsized, and the manufacturing cost can be greatly reduced, and its practical effectiveness is significant. There is something called a dog.

[Brief explanation of drawings]

FIG. 1 is an electrical wiring diagram showing a non-contact ignition device according to an embodiment of the present invention, and FIGS. 21A, 21B, and 21C are voltage waveform diagrams for explaining the operation of the device. In the figure, G is an electric magnet, M is a magnet rotor, B is a stator core, E is an exciter coil, A is a signal coil, A1 is a first signal coil, A2 is a second signal coil, and K is a semiconductor. Circuit section, Sl, C2, C5 are thyristors, C1, C2 are capacitors, D1-D, I are diodes, R1-R4 are resistors, ■ is an ignition coil, Wl is a primary coil', w21
d is a secondary coil, P is a spark plug.

Claims (1)

[Claims] Synchronized with the engine! , the exciter coil and the signal coil are wound around the same fixed center provided with a magnet generator driven by the device 7, and the rE direction of the exciter coil rTh: i
(The capacitor is charged with E, and when the engine is running normally, the signal voltage of the signal coil turns on the thyristor and the entire charge of the capacitor is discharged to the ignition coil to ignite the engine. Before the rotation speed becomes over-rotated, the severity of rotation increases to 17 and p +
-i, by disabling the signal voltage of the signal coil, the negative direction electrons generated by the exciter coil V'ζ turn on the thyristor 17, thereby retarding the ignition angle of the engine to a negative angle; A non-contact ignition device for an engine that prevents the engine from overspeeding.