JPS585096Y2 - internal combustion engine ignition system - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a capacitor discharge type internal combustion engine ignition system that uses a magnet generator as a charging source for a capacitor.

Conventionally, in the case of internal combustion engine ignition systems for multiple cylinders with two or more cylinders,
Generally, since a timing signal generator with several cylinders is required, the structure becomes complicated, and the disadvantage is that the magnet generator becomes bulky and the cost increases.

In order to eliminate the above drawbacks, the present invention provides capacitor discharge circuits for several sets of cylinders, connects the capacitor discharge circuit for the second cylinder in series with the thyristor of the capacitor discharge circuit for the first cylinder, and uses one timing signal. The generator generates an ignition signal corresponding to the number of cylinders, the first ignition signal operates the thyristor for the first cylinder to ignite, and the second ignition signal operates the thyristor for the first cylinder to ignite the first cylinder. In cooperation with the 2-cylinder thyristor, the 2nd cylinder side is ignited, and the 2nd cylinder side is ignited.
The cylinder thyristor detects the output of the capacitor charging coil, determines the polarity, and operates only when one side is polarized, making it possible to independently ignite the cylinder with a single timing signal generator. The object of the present invention is to provide an internal combustion engine ignition device that has a simple structure and is inexpensive.

The present invention will be described below with reference to embodiments shown in the drawings.

In FIG. 1, 1 is a capacitor charging coil of a magnet generator, 2 is a timing signal generator, 3. B.

5. 10, 13, 16, 1B are diodes, 4°9 is a capacitor, 14. '15 is a thyristor, 17 is a transformer, 17a and 17b are its primary and secondary coils, 6,
11 is the ignition coil 6a, 11a is its primary coil, 6
b and 1ib are the secondary coils, and 7 and 12 are spark plugs.

Next, a case where the above configuration is applied to an ignition system for a two-cylinder 90° crank internal combustion engine using a four-pole magnet generator will be described.

As shown in Fig. 2a, two cycles of alternating current voltage are generated in the capacitor charging coil IK for each rotation of the internal combustion engine, and when voltage is generated in the direction of the solid line arrow in Fig. 1, the capacitor charging coil IK changes from the capacitor depowering coil 1 to the diode 3 to Capacitor 4 → Parallel circuit of diode 5 and primary coil/'I/6a of ignition coil 6 → Earth, and capacitor charging coil 1 → Diode 8
→ Capacitor 9 → Diode 10 and ignition coil/I/11
1. Each capacitor 4 in the next coil 11a → ground circuit
, 9 are respectively charged as shown in FIG. 2 C2b.

When the polarity of the voltage generated by the capacitor charging coil 1 is in the direction of the broken line arrow in FIG. 1, the capacitor charging coil 1
→ Earth → Primary coil 17a of transformer 17 → Diode 16, energize in the circuit, and the secondary coil 1 of transformer 17
The voltage shown in FIG. 2e is generated at 7b and makes the thyristor 14 conductive, but since the thyristor 15 is not conductive at this time, the charge in the capacitor 4 is not discharged.

Next, at time t1, when the voltage shown in FIG.
Thyristor 15 → ground → discharge in the circuit of the primary coil 11a of the ignition coil 11, and the secondary coil 1 of the ignition coil 11
．． A high voltage is generated at 1b, and an ignition spark is obtained at the ignition plug 12.

In this case, the charge in the capacitor 4 is not discharged because the thyristor 14 is non-conductive.

, Next, when a voltage starts to be generated in the capacitor charging coil 1 in the direction of the dashed arrow in FIG.
Next, the thyristor 14 is made conductive by the output of the coil 17b, and when the output shown in FIG. 2a is generated in the timing signal generator 2 at time . The load is discharged through the circuit of capacitor 4 → thyristor 14 → thyristor 15 → earth → 11th coil of ignition coil 6, 7I/6a, and the spark plug?
Get a spark from VC.

By repeating the above operation, one ignition is performed in each cylinder at unequal intervals of 90° and 270° crank angles per revolution of the internal combustion armor.

Here, the diode 5.10 is for increasing the duration of the spark arc.

In the embodiment shown in FIG. 1, a resistor 19 is maintained as shown by the broken line instead of the transformer 17, and when the output of the capacitor charging coil 1 is in the direction of the broken line arrow, the first timing signal of the timing signal generator 2 is transferred to the thyristor. 15 to ignite the spark plug 12, and when the output of the capacitor charging coil 1 rises in the direction of the solid line arrow, the second timing signal of the timing signal generator 2 is applied to the thyristor 15.
may be applied to make this thyristor 15 conductive, and in conjunction with the conduction of the thyristor 14 due to the rising voltage of the capacitor charging coil /1/1 in the direction of the solid line arrow, the spark plug I may be ignited.

It can also be applied to a two-cylinder 180° crank internal combustion engine using a six-pole magnet generator.

In this case, in order to balance the capacitor charging pressures of each cylinder, one charging control signal is added to the timing signal generator, and the unnecessary capacitor charging side half-wave output of the capacitor charging coil is short-circuited by the thyristor 15. It's better to do so.

As described above, in the present invention, each capacitor is charged by the output of the capacitor charging coil, and the first output of the timing signal generator conducts a predetermined cyrisk to generate an ignition spark in a predetermined cylinder. , the polarity of the output of the capacitor charging coil is detected and the thyristors of the other cylinders are made conductive, and both thyristors are connected in series, and when the second output of the timing generator is generated, both thyristors are made conductive and the thyristors of the other cylinders are made conductive. Since ignition sparks are generated at the same time in the cylinder, only one timing signal generator can generate multiple ignition signals and, if necessary, charging control signals.
Multiple discharge circuits are independently controlled by the ignition signal generated by the timing signal generator, and each cylinder has 90° and 270° crank unequal ignition intervals with a simple configuration and low cost.
An excellent effect is that independent ignition for multiple cylinders such as 80° crank ignition can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an electric circuit diagram showing an embodiment of the present invention, and FIG. 2 is a waveform diagram of each part to explain the operation of the embodiment. 1... Capacitor charging coil of magnet generator, 2
...timing signal generator, 8,4...
・Diode and capacitor that constitute the second charge amount path,
6゜11...Ignition coil, 6a, 14...
...The primary coil and thyristor of the ignition coil 6 that constitute the second discharge circuit, 8, 9...The diode and the capacitor that constitute the first charging circuit, 11a, 15...
...The primary coil and thyristor of the ignition coil 11 that constitute the first discharge circuit.

Claims (1)

[Scope of utility model registration request] First and second charging that includes at least a capacitor charging coil of a magnet generator, each diode and each capacitor connected to the capacitor charging coil, and charges each of the capacitors via each of the diodes with the output of the capacitor charging coil. a circuit including at least each thyristor connected to each capacitor of each charging circuit and a primary coil of each ignition coil, and conduction of each said thyristor transfers the charged charge of each said capacitor to one of said each ignition coil.
first and second discharge circuits that discharge through the next coil; connected to the gate of the thyristor of the first discharge circuit; and after each of the capacitors is charged, two half-wave outputs are sent to the capacitor charging coil; and the other half-wave output are generated (′
・One timing that generates an ignition signal at each time
and a thyristor of the second discharge circuit has its gate connected to the capacitor charging coil, and after each capacitor is charged, a second ignition signal is sent to the timing signal generator. conductive when a half-wave output in the same direction as that generated is generated in the capacitor charging coil, and the thyristor of the second discharge circuit is connected in series with the thyristor of the first discharge circuit, An internal combustion engine ignition system characterized in that the charge in the capacitor of the second discharge circuit is discharged through the primary coil of the ignition coil only when both the thyristors are conductive.