JPS58183863A - Contactless igniting apparatus for internal-combustion engine - Google Patents

Abstract

PURPOSE:To charge a capacitor effectively, by short-circuiting one half-wave output of a generator coil by a short-circuiting semiconductor switching element while supplying the other half-wave output to other load in a contactless igniting apparatus for an internal combustion engine. CONSTITUTION:One half-wave output of a generator coil 1 is supplied to the base of a transistor 8 and the positive half-wave output is short-circuited. In this state, the voltage drop of the transistor 8 is increased. When the voltage drop of the transistor 8 reaches a prescribed value, a thyristor 6 is energized and the short-circuit current is interrupted abruptly. A capacitor is also charged by the high voltage. Further, when the induced voltage becomes higher than a prescribed value, a thyristor 11 is energized and the positive half-wave output is supplied to a battery 20. On the other hand, the other half-wave output of the coil 1 is supplied to the battery 20 via a diode and charges the same. With such as arrangement, it is enabled to prevent heating of the coil 1 and to reduce the size of the thyristor or other component parts.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a capacitor discharge type non-contact ignition device for an internal combustion engine.

Conventionally, in this type of cage, in order to make the charging voltage of the capacitor almost uniform from low engine speeds to islands, the charging source for the capacitor was a thin wire with a large number of turns, and the capacitor was charged mainly during low speed rotation. It consisted of a low-speed coil and a high-speed coil with a thick wire diameter and a small number of turns that charged the capacitor mainly during high-speed rotation, and the capacitor was directly charged by the output of these two coils.

However, the conventional system described above requires two coils with different specifications for low-speed and high-speed use as the ill capacitor charging coil, resulting in a complicated structure. Also, the dimensions become larger (3) The size of the magnet generator becomes larger.

(2) The low-speed charging coil is a thin wire (wire diameter 0.13 to 0.1
6m) is wound a lot (3000 to 70oO times), so workability is poor and quality problems are likely to occur.

(3) If an attempt is made to increase the secondary voltage, ie, the capacitor voltage, at low speeds, the secondary voltage, ie, the capacitor voltage at medium and high speeds will become too loud, and the heat resistance of the ignition coil or semiconductor element will be insufficient. There are problems such as.

In order to solve the above problem, the present invention substantially short-circuits one half-wave output of the power generating coil by a short-circuiting semiconductor switching element connected in parallel with the capacitor.
When this semiconductor switching element is cut off, the capacitor is charged by the high voltage induced in the generator coil, and the other half-wave output of the generator coil is supplied to other loads using a diode, which generates power with a large wire diameter and a small number of turns. It is an object of the present invention to provide a non-contact ignition device for an internal combustion engine that can satisfactorily charge a capacitor with a coil and can supply power to other loads while suppressing heat generation in each element.

(4) The present invention will be explained below with reference to embodiments shown in the drawings.

First, in the first embodiment shown in FIG.
It has been used 00 to 600 times, and in a magnet generator of the same size, the wire diameter is about 4 times larger than that of a conventional capacitor charging coil, and the number of turns is about 1/1O. 2
is a timing sensor that generates an output signal at the reference position,
3a and 3b are reverse half-wave output diodes 1 for extracting the reverse half-wave output shown by the dashed arrow of the charging coil l and supplying it to the battery 20. 4.5 is a diode lla between the terminals of the generating coil l. With voltage dividing resistors connected in series with each other,
The voltage dividing point a is connected to the gate of the thyristor 6.

This thyristor 6 is connected between the base and emitter of a transistor 8. 7 is the base resistance of the transistor 8, and this resistance 7. The thyristor 6 and the resistor 4.5 constitute a cut-off control circuit. Further, the transistor 8° constitutes a short-circuiting semiconductor switching element that short-circuits the forward output of the coil 1. 9.10 is connected between the terminals of thyristor 11 (5
) A voltage dividing resistor is connected in series through the diode 9a, and its voltage dividing point is connected to the gate of the thyristor 11. When the voltage generated in the coil 1 after the transistor 8 is turned off exceeds the set value, the thyristor 11 is turned off. It is designed to conduct electricity.

Then, the positive half-wave output of the generator coil 1 indicated by the solid arrow is supplied to the battery 20 via the thyristor 11 and the diode lla. And this thyristor 11. Resistor 9.10 and diode 9a.

11a constitutes a high voltage responsive half wave extraction circuit. 1
2 is a discharge blocking diode, 13 is an ignition capacitor,
Reference numeral 14 denotes a known electronic ignition signal generation circuit which uses the positive direction output of the generator coil 1 as a power source and receives the output signal of the timing sensor 2 as an input to electronically determine the ignition timing and generate an ignition signal. 15 is a diode for DC arc, 1
6 is an ignition coil, 16a is its primary coil, and 16b is its secondary coil. Reference numeral 17 denotes an ignition plug, and 18 an ignition thyristor serving as a semiconductor switching element for ignition, which becomes conductive when the ignition signal from the ignition signal generation circuit 14 is applied to the gate (6), and charges the capacitor 13 with charge. is supplied to the primary coil 16a of the ignition coil 16. 19 is a resistance.

Reference numeral 22 is a known regulator that short-circuits the negative output of the generator coil 1, indicated by a broken line arrow, when it exceeds a predetermined value.

Next, the magnet generator used in this example is N,
S rotor with 12 poles magnetized alternately at equal intervals, and 1 pole on the outer periphery.
The generator coil 1 is wound around the two protrusions of the stator core and connected in series with each other, and as the rotor rotates, the generator coil As shown in Figure 2 (al), six cycles of non-negative AC voltage are generated per one rotation of the rotor of the magnet generator.

Now, when a half-wave output in the direction of the solid arrow in Figure 1 (positive direction) begins to occur in the generator coil l, the coil 1 - resistor 7 -> base/emitter ground of transistor 8 - diode ll
In the circuit a, a base current flows through the transistor 8, conduction occurs between the collector and the emitter of the transistor 8, and the positive half-wave output of the coil 1 is short-circuited. At this time, as the short-circuit current of transistor 8 increases, as shown in FIG. When this voltage reaches a set value (for example, a voltage value corresponding to a short circuit current of 0.5 to 4 A), the thyristor 6 becomes conductive and the transistor 8
Since the base and emitter of transistor 8 are shorted,
The voltage between the collector and emitter of is 0FFL, and the short circuit current is abruptly cut off. At this time, in coil l! @2 Figure (C1
As shown, a large induced voltage is generated, and this voltage causes the capacitor 13 to be connected to the coil L - diode 12 -> capacitor 13 - diode 15 -> ground -> diode L.
With the circuit la, charge the battery sufficiently as shown in Figure 2 (dl).Also, the induced voltage is set at the set value (e.g. lOO~300 V).
), the voltage at the connection point of the voltage dividing circuit made up of resistors 9 and 10 increases, and the thyristor 11 becomes conductive. As a result, the positive half-wave output of the coil 1 is supplied to the battery 20 via the thyristor 11 and the diode lla, and the battery 20 is charged by the current shown in FIG. 2 (fl). By charging the battery 20, the positive half-wave output of the coil 1 is suppressed and overvoltage to each element is prevented.On the other hand, the reverse half-wave output of the coil 1 (indicated by the broken line arrow in FIG. 1) is generated by the diode 3a, battery 20 via 3b
is supplied to charge the battery 20 with a current indicated by tg+ in FIG. By charging the battery 20 in this way, the reverse half-wave output of the coil 1 is suppressed, preventing excessive reverse voltage from being applied to the thyristor 6.11 and the transistor 8, and causing reverse current to flow through the coil l. As a result, due to the armature reaction, the magnitude of the subsequent positive direction output is suppressed, and the current in coil l (second
(b)) and reduce the current of the thyristor 6. This prevents the coil l from generating heat and the thyristor 6,
The resistance can be reduced to 4.5°7.

Also, when the ignition timing is reached, the thyristor 18 is activated by the output of the timing sensor 2 shown in FIG.
conducts, and transfers the charge in the capacitor 13 to the capacitor 13
- Thyristor 18 - Earth → Rapidly discharge in the circuit of the primary coil 16a of the ignition coil 16,
The next coil 16b+lr [pressure is obtained and an ignition spark is generated at the ignition plug 17.

Here, the ignition signal generated in the ignition signal generation circuit 14 is:
It is preferable that the half-wave output not provided to the ignition power source is generated in the generator coil l as indicated by the broken line arrow in FIG. 1. This is because if the thyristor 18 is turned on by the ignition signal while the coil l is generating a half-wave output in the direction of the solid arrow, this half-wave output will be short-circuited by the thyristor 18, and the battery charging current will decrease accordingly. ,
This is to prevent this.

FIG. 3 shows the battery voltage and battery charging current characteristics with respect to the engine speed in the first embodiment, where characteristic A is the battery voltage and characteristic B is the case where the output of coil 1 is used only for battery charging. The battery charging current of
Characteristic C shows the buffer charging current in the circuit shown in Figure 1 in which the (lO) output of coil l is used for both battery charging and ignition power supply, and the output of coil l is used for both battery charging and ignition power supply. Even if the output of the coil I is used only for battery charging, a battery charging current almost the same as that obtained when the output of the coil I is used only for battery charging can be obtained.

The fld diagram shows a second embodiment of the present invention, which is similar to the first embodiment described above.
In contrast to the embodiment, the generator coils la and lb have a phase difference of 120° from each other as a magnet generator.

lc and each of these coils la.

Connect lb and lc in a three-phase Y type, and connect diodes 3a to 3d.
, 11a and a thyristor 11, and is connected to a battery 20 through a three-phase full-wave rectifier, of which a portion of the negative phase half-wave output is used as an ignition power source. In FIG. 4, instead of connecting the cathode of the thyristor 11 to the battery 20, the cathode of the thyristor 11 may be connected to a lamp 23 as shown by the broken line, and the lamp 23 may be turned on.

FIG. 5 shows a third embodiment of the present invention, in which the above-mentioned 112
In contrast to the embodiment, the voltage of the half-wave output on the buff battery charging side of the generator coil 1a-1c is adjusted by a known single-phase full-wave short-circuit type regulator 22a, and the regulator 22a in parentheses is
Single-phase full-wave I! The battery 20 is charged using the IIl device 3 depending on the direction of the coils 1a-1c.

According to this embodiment, a circuit can be constructed using a single-phase full-wave short-circuit regulator 3o with a full-wave rectifier that is currently commercially available. Here, the cathode of the thyristor 11 may be connected to the anode side of the diode 3c.

Figure 16 shows the 184th embodiment of the present invention, in which the first
In contrast to the embodiment, the diode 12a and the resistor 32 are controlled by the induced voltage of the coil 1 so that the conduction control timing of the thyristor 11 at low speed is immediately after the induced voltage of the coil 1 exceeds the peak point after the transistor 8 is cut off. The charge of the capacitor 33 charged via the diode 31 and the programmable unijunction transistor 34
The signal is supplied to the gate of the thyristor 11 via the thyristor 11. According to this embodiment, even during low-speed rotation when the induced voltage in the coil l when the transistor 8 is cut off is lower than the set value, the induced voltage after charging the capacitor in the coil l when the transistor 8 is cut off causes the battery to
0 can be charged. Here, the resistor 9 and the diode 9a may be omitted so that the thyristor 11 becomes conductive immediately after the induced voltage of the coil 1 exceeds the peak point after the transistor 8 is cut off even when the rotational speed becomes high. . FIG. 7 shows a fifth embodiment of the present invention. In contrast to the second embodiment described above, two generating coils la and lb which generate outputs in the same phase are used, and each terminal is connected to a three-phase full-wave rectifier. It was designed to connect to. If you do this,
The diameter and number of turns of the coil la can be arbitrarily set according to the charging of the battery 20, and the coil wire diameter and the number of turns of the coil 1b can be set according to the ignition power source.

FIG. 8 shows a 1186 embodiment of the present invention, in which the output of the coil l is supplied to the lamp 40 instead of the battery 20 in the first embodiment, and the negative direction output of the coil l is connected to the resistor. 51 and die (13) An ignition signal generating circuit 14a is used which supplies the ignition signal to the gate of the thyristor 18 via the ode 52. In FIG. 8, reference numeral 41 represents an operation switch for turning on and off the lamp 40, and 42 represents a resistor connected to the coil 1 when the lamp 40 is turned off.

In each of the above embodiments, the resistor 9,
10. The high voltage responsive half wave extraction circuit including the thyristor 11 can also be omitted.

In each of the embodiments described above, the electronic ignition signal generation circuit 14 uses the output signal of the timing sensor 2 as a human power to electronically determine the ignition timing, or the ignition signal generation circuit uses the negative direction output of the coil 1 as the ignition signal. 14a was used, but the output signal of the timing sensor 2 is directly transmitted to the thyristor 1.
It is also possible to use an ignition signal generating circuit that applies the signal as the control atOI number of 8.

As described above, in the present invention, the short-circuiting semiconductor switching element that substantially short-circuits one half-wave output of the generating coil is supplied with a short-circuit current due to the half-wave output on the charging side of the capacitor (14) of the generating coil. and a cutoff control circuit for cutting off the shorting semiconductor switching element when the shorting semiconductor switching element is sufficiently flowing. Since the other half-wave output is supplied to other loads by the reverse half-wave extraction diode, there are excellent effects as described below.

(11) Conventionally, two coils with different specifications were required as a capacitor charging coil: a coil with a large number of turns using m wire and a coil with a small number of turns using a thick wire. The structure is simple and the body size can be reduced.

(2) The degree of freedom in setting the capacitor voltage and secondary voltage is large, sufficient ignition performance can be obtained from low speeds, and starting performance can be improved.

(3) Since there is no need to use thin wire as a capacitor charging coil, quality problems can be resolved.

(4) The armature reaction caused by supplying the other half-wave output of the generator coil to the load by the reverse half-wave extraction diode suppresses the half-wave output of one of the generator coils, reducing the current flowing through each element. As a result, power can be effectively supplied to other loads while suppressing the heat generation of each of these elements.

Furthermore, in the present invention, the voltage induced in the generating coil is detected when the short-circuiting semiconductor switching element is cut off,
Every time this voltage exceeds the set value, the half-wave output from one side of this generator coil continues to be supplied to the other load, so the induced voltage in the generator coil is held down to the set value, and the unnecessary voltage that occurs continuously thereafter Not only can power be effectively supplied to other loads by supplying power to other loads, but also the heat generation of each element can be further suppressed, and the heat generation of the generating coil can also be suppressed. .

[Brief explanation of drawings]

FIG. 1 is an electrical circuit diagram showing a first embodiment of the device of the present invention.
Fig. 12 is a waveform diagram of various parts to explain the operation of the device shown in Fig. 1, Fig. 3 is a battery voltage and current characteristic diagram with respect to the engine rotation speed of the device shown in Fig. 1, and Figs. 4 to 8 are diagrams of the present invention. FIG. 6 is an electrical circuit diagram showing second to 1116th embodiments of the device; ■... Capacitor charging coil, 3a to 3d... Diode for reverse half-wave extraction, 4, 5, 6.7... Voltage dividing resistor, thyristor, base resistor, configuring the cutoff control circuit, 8...
...Transistor forming a short-circuit semiconductor switching element, 9.10.9a, 11...^ Voltage dividing resistor, diode 1 thyristor, 12.
...Discharge blocking diode, 13...Capacitor, 1
4...Electronic ignition signal generation circuit. 14a... Ignition signal generation circuit, 16... Ignition coil. 16a...Primary coil, 16b...Secondary coil, 1
DESCRIPTION OF SYMBOLS 1... Ignition plug, 18... Ignition thyristor forming a semiconductor switching element for ignition, 20... Battery as other load, 23.40... Lamp as other load. Representative Patent Attorney Takashi Okabe (17)

Claims (1)

[Claims] (Sufficient short-circuit current flows through the generating coil of the 11-magnet generator, a shorting semiconductor switching element that substantially shorts the half-wave output of one of the generating coils, and this shorting semiconductor switching element) a cutoff control circuit for cutting off the short-circuiting semiconductor switching element when the short-circuiting semiconductor switching element is cut off; a capacitor that is charged by a high voltage induced in the generating coil when the shorting semiconductor switching element is cut off; and a primary coil and a secondary coil. An ignition coil having a coil, a reverse half-wave extraction diode for supplying the other half-wave output of the generating coil to another load, an ignition signal generation circuit that generates an ignition signal at ignition timing, and this ignition coil. an ignition semiconductor switching element that is electrically connected by an ignition signal from a signal generation circuit to supply the charge charged in the capacitor to the primary coil of the ignition coil; and an ignition device connected to the secondary coil of the ignition coil (1); A non-contact ignition device for an internal combustion engine comprising: (2) a generating coil of a magnet generator, a short-circuiting semiconductor switching element that substantially short-circuits one half-wave output of this generating coil, and this short-circuiting semiconductor switching element; When a short-circuit current is sufficiently flowing through the element, a cut-off control circuit is provided to cut off this short-circuit switching element, and when the short-circuit semiconductor switching element is cut off, the generator coil is charged by a high voltage induced in the generator coil. an ignition coil having a primary coil and a secondary coil; a reverse half-wave extraction diode for supplying the other half-wave output of the generating coil to another load; and a short-circuiting semiconductor switching element. The high voltage induced in the generator coil at the time of interruption is detected, and each time this high voltage exceeds a set value, the half-wave output of one of the generator coils is sent to the other load or another load different from this load. A high voltage response half-wave extraction circuit that continues to supply a high voltage, a discharge blocking diode connected in series in the charging circuit of the capacitor, an ignition signal generation circuit that generates an ignition signal at the ignition timing, and this ignition signal generation (2) ) an ignition semiconductor switching element that is turned on by an ignition signal from a circuit to supply the charge charged in the capacitor to the primary coil of the ignition coil;
A non-contact ignition device for an internal combustion engine, comprising a spark plug connected to a secondary coil.