JPS60104773A - Ignition device for engine - Google Patents

Abstract

PURPOSE:To secure an accurate timing control motion in an inexpensive structure, by constituting an ignition device so as to make the timing control motion performable by degrees at a time when an engine speed exceeds the specified value by an exciter coil alone, without using a signal coil. CONSTITUTION:A condenser 6 is chargedby a plus side part (a) among generating output parts generated out of an exciter coil 1 with rotation in a magnet rotor 4. On the other hand, when the generation output is turned over to the minus side, a condenser 21 is made to do charging and, after the charging is over, an electric current is made to glow into a resistor 23, a thyristor 12, a varistor 13, etc., in order. Then, when the generation output reaches the peak of a minus side part (b) and the thyristor 12 is conducted, the condenser 6 is made to discharge, generating a spark in a spark plug 10 by means of high voltage at the side of a secondary coil 19. At this juncture, when an engine speed exceeds the specified value, the charged voltage of the condenser 19 exceeds a trigger voltage of a thyristor 16 at a time when the generation output is turned over to the minus side, thereby making the timing control take place.

Description

[Detailed Description of the Invention] This defense relates to an engine ignition system, in which the output of a 1 x citer coil is used to charge a charging/discharging capacitor, and this charging/discharging capacitor is connected to a The first
In order to make the switching element conductive, a low voltage wire is supplied to the primary coil of the ignition coil, and at this point, a high voltage is applied to the spark plug, which generates light in the secondary coil of the ignition coil. J, C generates a spark! (Apply 13'J tJ to the engine's ignition system that is designed to ignite the engine.)

The ignition device is pre-charged with the specified electric current C (1).
In the 4th period, the power of this capacitor was put in danger in the primary coil of the large-1 coil, and the secondary coil of the coil caught fire: 1
A high voltage is applied to the light convex U (J, which causes sparks to fly).

This J, U4I'I:, - in fire boiling, dokuni -
1-It is now possible to configure a ζ fire without using the power generation output of a single coil for charging and discharging. Become.

Therefore, it is widely used as an ignition device 6 for such engines.

In such an ignition device, in order to improve the efficiency of the engine, it is desirable to change the ignition timing according to the rotational speed of the engine. Conventionally, ignition systems have been known that advance the engine speed in stages to bring the -C ignition +1i period forward when the engine speed reaches a predetermined speed. However, conventional ignition devices like this
■In addition to the Kiriitani J-il, a signal coil was used, and the output from this signal coil was used to advance the angle in stages. Therefore, a signal coil is required in addition to the exciter coil, which complicates the structure and has the disadvantage of increasing the cost (-).

The present invention was made in view of these problems, and uses only a single-kilometer coil without using a signal coil to advance the engine when the engine speed reaches a predetermined speed. The object of the present invention is to provide an engine ignition device which improves the efficiency of a C engine.

The present invention has been described above as shown in the figure below for one embodiment.

Figure 1 shows the circuit configuration of the ignition device according to this embodiment.
1b's ignition system is 2 I: 4 ni 1 1 noita 1 ile 1 is installed.This work 4 igniter 1 iron core 2 of ile 1 has a magnetic ignition 3 embedded in it. It faces the outer surface of the magnetic rotor 4 with a small 17 tap.This magnetic J rotor 4 is, for example, -■-
It also serves as the flywheel fixed to the crankshaft 17 of the engine. 1. Furthermore, this capacitor 6 is connected in series with the primary coil 8 of the ignition coil 7.

On the other hand, the secondary coil 9 of the secondary coil 7 is connected to the spark plug 10.

U! A diode 11 is connected to the lρ column. The positive side of the electric condenser 6 is connected to the i) node of the thyristor 12. The cathode of these four Noiristors 12 is the varistor 133
It is connected to the negative side terminal of the above-mentioned 1-turner coil 1 through the uk column circuit of the 0-ter (A-doard 14). The connection point is connected to the connection point between the one-quasiter coil 1 and the diode 5 via the diode 15.

Next, the cathode of the second thyristor 16 is connected to the terminal 1- of the thyristor 12.

The seventh node of the thyristor 16 is connected to the negative terminal of the coil 1, and the gate of the thyristor 16 is connected to the diode 17 at the connection point between the cathode of the thyristor 12 and the varistor 13. and is connected through a series circuit of a resistor 18.

(At the connection point between the diode 17 and the resistor 18, a capacitor 19 and a resistor 2o are connected in parallel with each other, and a capacitor 19J3 and a resistor 20 are connected in parallel with the varistor 13. It is connected.

The cathode side of the C varistor 13 is connected to the capacitor 21.
It is connected to the negative side of the i-1 siter coil 1, indicated by -, via the die A-de 22. Then the capacitor 21 and the diode 22 are connected 1j1
is connected to the gate of the resistor 12 through the resistor 23.

Next, the operation of this ignition system having the 4f configuration as described above will be explained. 1:1-Sighter coil 1 is connected to the rotation of magnetic 6 rotor 4, and is connected to the magnetic b installed on this rotor 4.
J, shown in Figures 2A and 3N, due to the magnetic flux of 3.
This results in a power generation output with a similar waveform. Fig. 2 shows the change in the output voltage of 1 x 1 coil 1 when the engine speed is low, and 3N shows the change in the output voltage of 1 x 1 coil 1 when the engine speed is low. It shows. Among the outputs of this exciter coil 1, a potential difference is generated between the ends of this -1 coil 1 on the positive side a. 5. Charging/discharging m: Current flows in this order through the primary coil 8 of the ignition coil 7, and the exhaust coil 1, and this current charges the charge/discharge condenser 1. The operation of charging the capacitor 6 is the same whether the engine speed is low or low.The voltage of the capacitor 6 charged in this way is shown in FIGS. 2B and 3B. It becomes like this.

The output of exciter coil 1 is! ! ? ] With the rotation of rotation J″-4, as shown in Fig. 2A and 3N,
It will change from the positive side to the negative side. Soshi(
At the beginning of the shift to the negative side, when the engine speed is low, a striking-like action occurs.

When the output of the output terminal 1 is reversed to the negative side, current flows in the order of the output terminal 1, the diode 22, the diode 21, the diode 15, and the terminal terminal 1. When the capacitor 21 is charged by this current, and the condenser 1 and 21 are charged, the output IJ coil 1, diode 22, and resistor 23 are
, the current flows through the thyristor 12, the liJ cathode, the varistor 13, the diode 15, and the exhaust node 1. here? The reason why thyristor 12 has to be wide is that even if the output of thyristor 1 changes to the negative side, until capacitor 21 is charged, thyristor 12
No gate current is supplied to the Therefore, as shown in Fig. 2 Aa3 and B, when the output of the exhaust coil 1 reaches the part b and reaches its peak at around 11 °C, the thyristor 12 finally conducts and the charge in the capacitor 6 is reduced. There will be 11 discharges.

To explain in more detail the operation of this discharge 7u, the negative output of the exciter coil 1 is charged with 21, and then the gate of the thyristor 12 is charged. When a current is supplied to the thyristor 12, the current flows in the following order: condenser 1, thyristor 12, varistor 13, diode 14, ignition coil 7, primary coil 8, and capacitor 6. As a result, the current in the primary coil 8 of the ignition coil 7 suddenly changes.
A high voltage is induced at J, and a spark is generated at the spark plug 10 connected to the secondary coil 9. As a result, the ignition of the engine is interrupted.Furthermore, due to the discharge of the charging/discharging capacitor 6, a current flows through the varistor 13, so that the capacitor 19 is charged by the potential difference between both ends of the varistor 13. That will happen.

The charge in the capacitor 19 is transferred to the capacitor 19, the resistor 18, the gate of the thyristor 16, the l1iJ cathode,
Thyristor 12 goo 1~, same cathode, varistor 13
, a3 and a capacitor U19, and is discharged. At the same time, part of the charge of this capacitor 19 is consumed by a resistor 1A20 connected in parallel to this capacitor 19. Therefore, the change in the electric current J'[ of the C connection 1 and 19 becomes as shown in FIG. 2C, and changes in a sawtooth pattern.

The important thing to note here is that because the engine speed is low and the output of the exciter coil 1 is also small, the discharge of the capacitor V19 causes the thyristor 16's G1 to temporarily exceed the gate trigger current. Although a large current flows through Irista 12, the current of Irista 12 is larger than this.
2 does not turn on. In addition, in this case, the photoelectric voltage of 19 is also low, and the exciter.
Before the output of the coil 1 changes from the positive side to the positive side, the voltage of the capacitor 19 changes to 1-
The voltage will exceed the trigger voltage. Therefore, when the number of revolutions of the -C engine is higher than a predetermined number of revolutions, the capacitor 19 and the second resistor 16 prevent the first relay 12 from becoming conductive, and the "quieter" 1 output? Ji I": does not perform an ignition operation on its own after switching from the positive side to the negative side.

On the other hand, when the engine speed exceeds the predetermined rotation speed, the output of the J-giri alternator coil 1 increases, and the period 1, 'i required for one recycle becomes zero. Since the voltage is reduced, the change in the voltage of the capacitor 19 is as shown in FIG. 3C. What you should pay attention to in this graph is that even if the change in mo is the same sawtooth shape, when the output of ile 1 changes from the positive side to the positive side, The voltage of the terminal 1J19 is above the trigger voltage of the Zyristor 16. Accordingly, the engine rotates once while a current greater than the electric current flows from the gate 19 to the gate of the second glue resistor 16, and the exciter 1 is turned on.
When the output changes from part a to part b, the output of
A signal current is applied to the gate of 2. That is, when the output of I4-Zyta coil 1 changes from the positive side to the negative side, the output of the exhaust coil 1, the anode of the relay 16, the cathode, the goo of the relay 12, IiJ cathode, the varistor 13, and the diode 15. , the current flows in the order of the exciter coil 1, and this causes the 4 Noiristers 1
2 becomes conductive, and the charge/discharge battery 1 is rapidly discharged. Therefore, II lightning voltage is induced in the secondary coil 9 of the ignition coil 7, a spark is generated in the ignition plug 10, and ignition is performed.

In this way, the engine speed exceeds the specified speed, and ■
When the output of the converter coil 1 changes from the positive side to the negative side, the voltage 11 of the capacitor 19 exceeds the voltage of the second four-way resistor 16, and when the voltage exceeds the voltage of the second four-way resistor 16, the knee 1-returner] Immediately after the output voltage of Illustrator 1 changes from the positive side to the negative side, Iristor 12 becomes conductive.
The ignition operation will be performed b. Therefore, compared to the case where the engine rotation speeds are close, the advance angle is tJ at 0 in FIG. 3. Accordingly, the changes in the ignition angle with respect to the engine speed are shown in Figure 4.
When the number of rotations of the engine exceeds a predetermined number of rotations, the angle is advanced in stages.

As shown in 2 below, according to the ignition system according to the actual Filli example, when the engine rotation speed exceeds a predetermined rotation speed, the advance angle is advanced by 11 in stages. In addition, according to the ignition system according to this embodiment, the advance angle operation is mainly performed by the 21st position 19 and the 2nd position iris 6. When the output of the capacitor 19 changes from the positive side to the negative side, in the case where the predetermined rotational speed exceeds λl, The voltage 1F is made to exceed the voltage of the Zyristor 16, which causes the advance angle to become (J) in stages.Therefore, according to this configuration, the circuit configuration Change Jrunomi (・, Vi
It becomes possible to perform advance angle operation without using the %-] file. Therefore, it becomes possible to provide I+ with an ignition device that advances the angle at a low cost.

As described above, the present invention connects the control electrode of the first switching element to the terminal on the side of the exciter coil, and connects the control electrode of the first switching element to the A first capacitor is connected in parallel with H, and the output terminal of the second switching element is connected to the control electrode of the first switching element,
However, when the first switching element becomes conductive, the second switching element is charged by the discharge current of the charging/discharging capacitor.
Control of the second switching element
Connect to the electrode, and if the engine speed is low, use J-1.
:The output of the second one turns to the negative side, and on top of that, the output of the last one changes to the negative side of the first one.
After the first switching element is charged, the ignition operation A'1 becomes conductive, and when the engine speed exceeds a predetermined rotation speed, the second switching element is switched on. J: - [The second switching element is turned on, and the output of the 4-length itacall turns to the negative side. Therefore, according to the present invention, when the number of revolutions of one engine exceeds a predetermined number of revolutions, the ignition operation is advanced in stages. This makes it possible to improve the efficiency of the engine.Furthermore, according to the present invention, this advance angle operation can be performed as a second advance angle operation.
Since this is achieved by the ignition valve and the second switching element, it is possible to provide an ignition system that does not require a signal line and thereby provides an advance angle movement (7l!:(j) at a low cost. becomes possible.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of an engine ignition system according to an embodiment of the present invention, and Figure 2 is a circuit diagram of an engine ignition system according to an embodiment of the present invention.
Figure 3 is a small graph showing the changes in the electric current of the upper coil 1, the upper coil 6, and the capacitor 19.Figure 3 shows that when the engine speed is high, Figure 4 is a graph showing changes in the voltage of the capacitor 19, and graph C shows changes in the ignition angle with respect to the rotational speed of one engine of the ignition system according to this embodiment. In, 1... Exhaust coil 6... Charging/discharging ° Municipal condenser 1) 7... Ignition coil 8... - Secondary coil 9... Secondary coil 10... Spark plug 12... No. 1 thyristor 16...second thyristor 19...second capacitor 21...first condenser 1no.

Claims (1)

[Claims] 1. When the charging/discharging capacitor is charged by the output of 1 key 1 noitani 1 ile, the first switching element connected to this charging/discharging content is made conductive.
supplying the electric charge to the primary coil of the ignition coil,
At this time, the high voltage generated in the secondary coil of the ignition coil is applied to the ignition plug, and the ignition is set to generate a spark and ignite. , the control electrode of the first switching element is connected to the negative terminal of the first switching element coil, and a second electrode is carved in the upper coil so as to be parallel to the first switching element and U. 1 capacitor is connected, and the output end of the second switching element is connected to the control ta11 electrode of the first switching element.
b (a second capacitor 1 charged by the discharge current of the charging/discharging Ichikawa capacitor when the first switching element passes yJ) is connected to the control electrode of the second switching element; , when the engine speed is low, the output of the exciter coil changes to the negative side, and after the first converter is charged by the output of the exciter coil on the my booth side, the first switching cable is When r is the interrogation and the ignition operation is performed tj, when the engine rotation speed exceeds the predetermined rotation speed, the second condenser V is connected to J. Immediately after the output of the coil changes to the negative side, - (the first switching element is made conductive and an ignition operation is performed. , an ignition device for an engine, characterized in that: 2. switching element J3 of the V81;
1j The ignition switch for an engine according to claim 1, wherein the second switching elements are both composed of 1) iris resistors, and their control electrodes are composed of iris. @.