JPS58195071A - Ignition device of engine - Google Patents

Abstract

PURPOSE:To increase a discharge current and discharge time, by plurally providing capacitors and discharging the other capacitor immediately after completion of a discharge of one capacitor in a contactless ignition device of capacitor charge discharge type. CONSTITUTION:Ignition power generated in a generating coil 1 charges the first capacitor 3a and the second capacitor 3b. At ignition timing of an engine, charged electricity of the first capacitor is discharged to a primary coil 5 by the first thyristor 11, and an oscillating current of the coil 5 charges a signal capacitor 14 through a voltage drop of a resistor 13. In accordance with attenuation of the oscillating current, earth potential and terminal potential of + polarity of the capacitor 14 are inverted, and the second thyristor 16 is triggered to discharge the capacitor 3b to the third closed circuit. In this way, a discharge current and discharge time are increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine ignition system that has a long discharge duration and a large discharge current value to improve ignition performance.

In general, CDI ignition devices have the advantage of being resistant to plug fouling, but have a short discharge duration and are inferior to current ignition systems in terms of ignition ability. Therefore, engine ignition systems that extend the discharge duration have been proposed.
On the contrary, since the discharge current value and energy density are lowered, the ignitability cannot be sufficiently improved, and furthermore, there are disadvantages such as a decrease in the fouling resistance of the plug.

Therefore, an object of the present invention is to provide an engine ignition system that increases ignition energy, particularly discharge duration, and has multiple ignition features without losing the features of ti CDI.

In order to achieve such an object, the present invention includes a power generation coil that supplies ignition power, a first diode and a second diode that divide and rectify the output of this power generation coil, and a power generation coil that is charged with the rectified output. A first capacitor and a second capacitor forming a first closed circuit that is triggered by a signal voltage generated in the signal coil and causes the charged charge of the first capacitor to flow to the primary coil 1 of the ignition coil. The first capacitor is charged in the opposite direction by the discharged charge discharged in the first thyristor and this first closed circuit, and the second closed circuit passes the charged charge to the gate and the primary coil of the ignition coil. a signal capacitor that is charged by a portion of the discharge current that flows through the second closed circuit; and a signal capacitor that is triggered by the charging voltage charged to this signal capacitor and that and a second thyristor forming a third closed circuit for flowing charging charge to the primary coil of the ignition coil, and will be described in detail below using examples.

FIG. 1 is a circuit diagram showing an embodiment of an engine ignition system according to the present invention. In the same figure, (1) ii is a generator coil forming an ignition power source, (2&) and (2b) are a first diode and a second diode that rectify the output of the generator coil (1), respectively, (3a) and (3b) are ) are the first and second rectifier diodes (2a) and (
2b) a first capacitor and a second capacitor charged with the rectified output by (4) the primary coil (
5) and a secondary coil (6), the cocidenser (
When the charged charges in 3a) and (3b) are discharged through this secondary coil (5), the ignition coil that generates a high voltage in (6) this secondary coil, and (7) this ignition coil. A spark plug that sparks when a high voltage is applied to the coil (4); (8) is a signal coil that generates an ignition signal; (9) is a signal coil that generates an ignition signal;
) is the diode whose 7th node is connected to one end of this signal coil (8), (10) is the gate resistor connected between the cathode of this diode (9) and the ground, and (11) is the gate to which the ignition signal is applied. When , the first thyristor, ji2) ld reverse direction diode, (13)
Fl A low resistance value resistor connected in series with this reverse diode (12), (14) Fi signal capacitor, (15
) is the diode, (16) is the second thyristor, (17
) I/i is a diode whose cathode is connected to the 7 node of this second thyristor (16) and whose anode is connected to ground, the gate resistance of the second thyristor (17,!).

Note that the first capacitor (3aJ - the first thyristor (11) - the primary coil (5) of the ignition coil (4) constitutes a first closed enclosure ik'i, and the first capacitor (3λ ) The primary coil (5) of the ignition filter (4) - the resistor (13) - the reverse diode (12) constitute a second closed circuit, and the capacitor (3b) of the front hole 1 and 2 - the second
A third closed circuit is formed by the thyristor (16) and the primary coil (5) of the ignition coil (4).

Next, we will discuss the operation of the engine ignition system with the above configuration in the second section.
This will be explained with reference to FIG. 2(a) to FIG. 2(a). First, the ignition power generated in the generator coil (1) is jtth x
diode (2a) and second diode (2b)
It is divided into two parts and rectified. The rectified ignition power charges the first capacitor (3m) and the second capacitor (3b), so the first and second capacitors
capacitors (3a) and (3b) tit, maintain a predetermined voltage. - On the other hand, when a signal voltage is generated in the signal coil (8) at the ignition timing of the engine, this signal voltage diode (9) is connected to the first thyristor (11).
applied to the gate of Therefore, this first thyristor (11) becomes conductive. Therefore, the first capacitor (3a) is charged 1! Electrical power #I is discharged to the primary coil (5) of the ignition coil (4) via the first thyristor (11) in the conductive state. Therefore, a high voltage is generated in the secondary coil (6) of this ignition coil (4), and the spark plug (7)
cause the flames to fly. Then, this discharge current line eventually becomes the first
The capacitor (3a) of is charged in the opposite direction. Then, when this first capacitor (3a) is charged in the opposite direction,
A current flows in the second closed circuit in the opposite direction to the first current, but due to the voltage drop across the resistor (13) due to this current, -
The current passes through the diode (15) and charges the signal capacitor (14) to the polarity shown. In this way, since the excitation current flows, the secondary coil (6) of the ignition coil (4)
), an oscillating voltage shown in Figure 2 (a) is generated, causing the spark plug (7) to spark. Then, the first capacitor (3a
), the discharge eventually stops as the energy stored in it decays. While the signal capacitor (14) is being charged, the shearth potential is higher than the potential of the single-polarity terminal shown in FIG.
At the time 1+ position shown in the figure (IL), the ground potential and the potential of the signal capacitor (149+ polarity terminal) are reversed, so the charge of the signal capacitor (14J) is transferred to the second thyristor (16, resistance≦13
) for the signal >yy+<”) (7) -4(7)f/1., , gate,,gf#st,b+b・This second cyrisk (16
) is triggered and becomes conductive. Therefore, due to the conduction of this @2 cyrisk (16), the charge charged in the second capacitor (3b) is discharged to the third closed circuit, and therefore flows to the primary coil (5) of the ignition coil (4). Therefore, the secondary coil (6) of the ignition coil (4) has a second
The oscillating voltage shown in Figure (b) is generated. This oscillating voltage is applied to the first capacitor (3a) <! :Second capacitor (3
As long as the energy in b) is the same, the oscillating voltage will be similar to the oscillating voltage shown in FIG. 2(a). Therefore, the voltage generated in the secondary coil (6) of the ignition coil (4) is
Since the oscillating voltage shown in Fig. 2(c), which is a combination of the oscillating voltage shown in Fig. 2(a) and the oscillating voltage shown in Fig. 2(c), is applied, one cycle is longer than discharge by a single capacitor. Ru. At this time, the voltage is suppressed to a constant value by the discharge gap of the spark plug (7), but the discharge current is doubled as shown in FIG. 2(a).

In addition, in the above embodiment, the case where one cycle is extended by using the second thyristor has been explained.
Second Sai Ij, 181.1. It is possible to extend the discharging time by sequentially connecting N stages of circuits each including a second reverse diode, a second resistor, a second signal capacitor, and a third signal capacitor. Of course. It goes without saying that each capacitor can be converted into two plugs by feeding power to separate ignition coils.

As described above in detail, according to the engine ignition device according to the present invention, the discharge current and discharge time can be increased, so that ignition performance can be improved. Moreover, depending on the design value of the primary inductance of the ignition coil, it is possible to obtain a discharge time equivalent to that of the new current interrupt system, and the engine can be reliably ignited without impairing the stain resistance of the spark plug, which is a feature of CDI. There are effects such as being able to.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of an engine ignition system according to the present invention, and FIGS. 2(a) to 2(d) #'i are diagrams showing waveforms of various parts in FIG. 1. (1)...Generating coil, (2&)...First diode, (2b)...Second diode, (3a
)...First capacitor, (3b+...Second
capacitor, (4)...Ignition coil, (5)...
・・Primary: 1(ru, (6)・・・・Secondary coil, (7)
...Spark plug, (8) ...Signal coil, (9
)... Diode, (10)... Resistor, (11
)...First thyristor, (12)...Reverse diode, (13)...-Resistor, (14)...
Signal capacitor, (15)... Diode, (
16)...Second thyristor, (17)...
Conflict diode, (18)... life gate resistance. Note that the same reference numerals indicate the same or equivalent parts. Agent Shin Kuzuno −

Claims (2)

[Claims] (1) A generating coil that supplies ignition power, a first diode and a second diode that divide and rectify the output of this generating coil, and a capacitor of tJcl and a second diode that are each charged with the rectified output. The first capacitor, which is triggered by the signal voltage generated in the signal coil, causes the charged charge of the first capacitor to flow to the primary coil of the ignition coil.
The first thyristor forming a closed circuit and the discharge charge discharged in the first closed circuit #! The first capacitor is charged in the opposite direction, and the resistor and reverse diode form a second closed circuit that allows the charged charge to flow to the primary coil of the ignition coil, and a portion of the discharge current flows to the second closed circuit. Triggered by the signal capacitor being charged and the charging voltage charged to this signal capacitor, the second
and a second thyristor forming a third closed circuit for flowing the charged charge of the capacitor to the primary coil of the ignition coil,
An engine ignition system characterized by extending the current flowing through the primary coil of an ignition coil and causing a doubled discharge current to flow. (2) A circuit including a second reverse diode, a second resistor, a second signal capacitor, and a third thyristor is sequentially connected in eight stages to the second thyristor of the third closed circuit. An engine ignition system according to claim 1, characterized in that: