JPS60201070A - Contactless ignition device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To permit to enlarge degree of freedom for selecting the generating position of ignition signal by inserting a capacitor charging circuit into a voltage responsive conduction circuit. CONSTITUTION:The voltage responsive conduction circuit 44, conducted by a voltage higher than a generating voltage in a charging coil 1 upon short-circuit of a capacitor charging coil 1 and lower sufficiently than a high voltage induced in the charging coil upon intercepting a short-circuit circuit, is inserted into the charging circuit for a capacitor. According to this method, the output of the charging coil is prevented from being short-circuited by a semi-conductor switching element even when an ignition signal is being generated upon short-circuit of the charging coil. Further, degree of freedom for selecting the generating position of the ignition signal may be enlarged. Furthermore, when the voltage, which conducts the voltage responsive conduction circuit, is set higher than a no- load voltage generated in the charging coil subsequent to a high voltage induced upon intercepting the short-circuit circuit, the ignition signal may be generated in any position except a time when the high voltage of short time is induced upon intercepting the short-circuit circuit.

Description

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

[Prior art]

Conventionally, as a product of this kind, Japanese Patent Application Laid-Open No. 58-172463
As shown in Publication No. G, the half-wave output of the capacitor charging coil is short-circuited, and when this short-circuit current flows beyond a predetermined value, the short-circuit is opened and a high voltage is induced in the charging coil.
Therefore, it is being considered that a capacitor can be charged using this high voltage.

However, in the conventional device described above, when the half-wave output on the capacitor charging side is generated in the charging coil, the ignition cyrisk is made conductive, and the charged charge of the capacitor is supplied to the primary coil of the ignition coil, and the ignition is started. When the plug is lit, the half-wave output of the capacitor charging side of the charging coil will be short-circuited by the ignition silicate, causing excess current to flow through the ignition silicate, which may be damaged by heat. Therefore, the generation position of the ignition signal to conduct the ignition signal must be set when the anti-capacitor charging side half-wave output is generated in the charging coil, and the degree of freedom of selection is small. There's a problem.

[Purpose of the invention]

In order to solve the above-mentioned problems, the present invention provides a voltage-responsive conduction circuit of a capacitor that conducts with a voltage higher than the voltage generated in the charging coil when the charging coil is short-circuited and sufficiently lower than the high voltage induced in the charging coil when the short-circuit is interrupted. By inserting it into the charging circuit, even if an ignition signal is generated when the charging coil is short-circuited, the output of the charging coil can be prevented from being short-circuited by the ignition semiconductor switching element, and the position where the ignition signal is generated can be prevented. The purpose is to increase the degree of freedom in selection.

Furthermore, by setting the voltage at which the voltage-responsive conduction circuit conducts to be higher than the no-load voltage generated in the charging coil following the high voltage induced when the short circuit is interrupted, a short period of voltage is applied when the short circuit is interrupted. An object of the present invention is to be able to generate an ignition signal at any position other than when the ignition signal is induced, thereby further increasing the degree of freedom in selecting the position at which the ignition signal is generated.

〔Example〕

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

In Fig. 1, ζ and ■ are the capacitor charging coils of the magnet generator, for example, wire diameter 0.3 to 1.0 fins, number of turns 20.
0 to 600 times are used. 2 is a timing sensor that generates each half-wave output signal in the positive direction and negative direction at the highest advance angle position and the lowest advance angle position; 3 is a short-circuiting diode that short-circuits the reverse direction output of the charging coil l; 4.5 is a short-circuiting diode Voltage dividing resistors are connected in series between the terminals of the capacitor charging coil 1, and the voltage dividing point a is connected to the gate of the thyristor 6, and the voltage generated in the positive direction of the coil 1 is set to a relatively small first set value ( For example, when the voltage exceeds 2 to 3 V, the Cyrisk 6 becomes conductive. This cyrisk 6 is connected between the base and emitter of the transistor 8. Reference numeral 7 denotes a Heas resistance of the transistor 8, and this resistance 7, the Sirisk 6, and the resistance 4.5 constitute a cutoff control circuit. Further, the transistor 8 serves as a short-circuiting semiconductor switching element that short-circuits the forward output of the coil 1. 9.10 is a voltage dividing resistor connected in series between the terminals of the coil 1, the voltage dividing point of which is connected to the gate of the thyristor 11, and the positive direction induced in the coil 1 after the transistor 8 turns 0 and FF. The second set value where the high voltage is relatively large (e.g. 100-300 V)
If the voltage exceeds this level, a short circuit will occur. The zyristor 11 and the resistor 9. IO constitutes a high voltage responsive short circuit. 13 is an ignition capacitor; 14 is a known electronic ignition signal generator that uses the positive output of the charging coil 1 as a power source and inputs the output signal of the timing sensor 2 to electronically determine the ignition timing and generate an ignition signal. It is a circuit. 15 is the DC arc da/f auto, 16 is the ignition coil, 16a is its primary coil, and 16b is its 2nd coil.
Next is the coil.

Reference numeral 17 indicates an ignition plug, and 1B indicates an ignition sirisk which is a semiconductor switching element for ignition, and conducts when the ignition signal from the ignition signal generation circuit 14 is applied to the gate, transferring the charge in the capacitor 13 to the ignition coil 16. It is supplied to the primary coil 16a. 19 is a resistance. 12
For example, a charging control circuit inserted into the charging circuit of the capacitor 13, and a diode 40 connected between its anode and cathode.
and a resistor 41 are connected, and a resistor 42 is connected between the gate and the cathode, so that the positive direction generated voltage of the charging coil 1 is between the first set value and the second set value. When the voltage exceeds a third set value (for example, about 20 V), conduction occurs. A voltage-responsive conduction circuit 44 is constituted by the SIRISK 12, the diode 40, and the resistors 41 and 42.

Next, the structure of the magnet generator used in this example will be explained. In FIG. 2, 30 is a bowl-shaped rotor, and 31 is a ring-shaped main magnet fixed to the inner circumferential surface of the rotor 30, which is magnetized with 12 poles alternately <N and S at equal intervals as shown in the figure. 3
2 is a ring-shaped stake core fixed to the side wall of the internal combustion engine, and on its outer periphery there are protrusions 322 to 3 of 12111i1.
2ff are formed at equal intervals. Reference numeral 33 denotes a lamp load coil which is wound around each of the ten protrusions 3'2C to 321 and connected in series with each other, and serves as a power source for a load such as a lamp. 34 is a boss fixed to the crankshaft of the inner MAti by a bolt (not shown);
A rotor 30 is fixed to 4 via a rivet (not shown). 35 is an ignition signal timing sensor fixed to the side wall of the internal combustion engine on the outer periphery of the rotor 30, and includes a permanent magnet 35a magnetized in the radial direction, a core 35b fixed to the permanent magnet 35a, and a sensor wound around the core 35b. coil 2
It becomes more. Reference numeral 36 denotes protrusions made of a magnetic material provided on the outer periphery of the rotor 30 at intervals corresponding to the ignition advance width.A core 35b is provided at a position facing this protrusion 36, and the core 35b and the protrusion 36 Due to the change in magnetic flux due to the opposing positions, each half-wave output voltage in the positive direction and in the negative direction is generated in the sensor coil 2 at the highest advance angle position and the lowest advance angle position, as shown in FIG. 3 (fl). , the coil 1 is wound around the two protrusions 32a and 32b and connected in series with each other, and as the main magnet 31 rotates, the capacitor charging coil 1 is connected to the capacitor charging coil 1 of the magnet generator as shown in FIG.
Six cycles of no-load AC voltage are generated per rotation of the motor.

Now, when charging coil 1 begins to generate a half-wave output in the direction of the solid line arrow (positive direction) in Fig. 1, coil 1 - resistor 7 - 1 -
A base current flows through the transistor 8 in the base-eminter-to-ground circuit of the run risk 8, conduction occurs between the collector and emitter of the transistor 8, and the output of the coil 1 is short-circuited. At this time, the transistor 8 shown at +81 in Fig. 3
As the short-circuit current increases, the voltage drop between the collector and emitter of transistor 8 increases, and the voltage at connection point a of the voltage divider circuit made up of resistors 4 and 5 increases. When this voltage reaches a set value (for example, a voltage value corresponding to a short-circuit current of 0.5 to 4 A, a terminal voltage of coil 1 of 2 to 3 V), Cyrisk 6 becomes conductive and short-circuits between the base and emitter of transistor 8. The voltage between the collector and emitter of the transistor 8 is 0FFL, and the short circuit current is abruptly cut off. At this time, a large induced voltage is generated in the coil 1 as shown by the solid line in FIG.
Fully charge the capacitor 13, diode 15, and ground circuit as shown in Figure 3 (C1).Also, when the induced voltage exceeds the set value (for example, 100 to 300 V),
The voltage at the connection point S of the voltage divider circuit made up of resistors 9 and 10 rises, the thyristor 11 becomes conductive, and the terminals of the coil L are short-circuited, preventing overvoltage and causing a current to flow due to the no-load voltage generated after the induced voltage. This prevents heat generation in the resistor 4.7, and furthermore, the armature reaction causes the diode 3 in the opposite direction to
Keep the current value small. On the other hand, the reverse output of the coil 1 (indicated by the broken line arrow in Figure 1) is short-circuited by the diode 1-3 to prevent excessive reverse voltage from being applied to the f-lister, 11, and transistor 8, and to By passing a reverse current through the armature, the armature reaction suppresses the magnitude of the subsequent positive output, reducing the current in the coil l (Fig. 3(e)) and the current in the sensor f. Jru. This prevents heat generation in the coil 1, resistors 1-3, resistors 4, 5.
7 can be downsized.

Also, when the ignition timing comes, the timing sensor 2 shown in Figure 3 (
The ignition signal determined electronically by the ignition signal generation circuit 14 causes the cyrisk 11) to conduct, and the charging type 1;;i of the condenser 9'13 to be connected to the condenser 1
3-Sirisk 18-Earth-1 The circuit of the primary coil 16a of the ignition coil 16 is suddenly hk-U, the secondary coil of the ignition coil 16 1.6. Obtain high voltage at b, spark plug 1
Generates an ignition spark at 7.

Here, the electronic ignition signal generation circuit 14 gradually advances the ignition signal generation position from the lowest advance position to the maximum advance position as the engine speed increases.
Immediately after i, a high voltage is induced in the -C coil 1 and the capacitor 13 is charged to a predetermined value or more, and then the thyristor 12 is cut off. Since it is only time,
At other times, when the ignition signal is generated and the thyrisk 18 becomes conductive, the output of the coil 1 will not be short-circuited by the thyrisk 18. Therefore, not only at the angle θt shown in FIG. 3 where a negative direction output is generated in the charging coil 1, but also while a positive direction output is generated in the charging coil 1, the transistor 8 is cut off and the coil 1 receives a high voltage. It becomes possible to generate an ignition signal in the range of angle θ2 shown in FIG. 3 from when a voltage is induced for a short time until the next high voltage is generated, and the degree of freedom in selecting the ignition position can be increased.

Here, even if the transistor 8 is cut off and a high voltage is generated in the charging coil 1, this high voltage is lower than the second set value when the engine is running at low speed, so the circuit 11 does not conduct, and in this case After the capacitor 13 is charged with a high voltage and the Cyrisk 12 is cut off, a positive no-load voltage is generated in the coil 1 as shown by the broken line in Figure 3 (bl), so this no-load voltage (For example, about 15V at engine speed 11,000 rpm)
It is necessary to set the third set value to a value (for example, about 20 V) such that when the voltage 8 becomes conductive, the cyrisk 12 does not become conductive by Nf degrees. Then, as the engine speed increases, the high voltage induced in the charging coil 1 increases and the engine speed increases.
It becomes higher than the second set value at about 000 rpm,
The Lee iris resistor 11 becomes conductive, and the positive output of the charging coil 1 after the high voltage is generated is also short-circuited by the cyrisk 1 as shown by the solid line in Figure 3(b), so the coil 1 is not loaded following the high voltage. No voltage is generated, but a small short circuit voltage of about 1 to 2V.

Here, if the high voltage response short circuit including the thyristor 11 is not provided, as the engine speed increases, the no-load voltage generated in the charging coil l following the high voltage gradually increases until the maximum speed. , it is necessary to set the third annotation value higher than the no-load voltage at this maximum rotation speed.

FIG. 4 shows another embodiment of the present invention, in which the embodiment shown in FIG.
In addition to supplying the load such as the battery 20 via F'3a and 3b, a high voltage higher than a predetermined value induced in the charging coil 1 is also supplied to the diodes lla and 11 by conduction of the thyristor 11.
11. The battery 20 is supplied to the battery 20 via the power supply terminal b. Here, 22a and 22b are regulators, and since the rated voltage of the battery 20 is about 6V or 12V, the set voltage of the regulators 22a and 22b is also set to a value slightly higher than 6V or 12V.
When the SIRISK 11 is conductive, the high voltage of the coil 1 is supplied to the battery 20, but the output of the coil 1 is substantially short-circuited through the SIRISK 11, the diodes 1"lla, llb, and the battery 20 or the regulator 22b. At this point, Cyrisk 18
Even if it becomes conductive, Cyrisk 12 will not become conductive again.

In each of the above-described embodiments, the third set value is set to a voltage higher than the no-load voltage that is subsequently generated in the charging coil 1 when the high voltage responsive circuit does not operate when a high voltage is generated in the charging coil 1. was set, but the number of engine times is lo0
At a relatively low rotational speed of about 0 rpm, the Cyrisk 11 becomes conductive and the positive output of the charging coil 1 is short-circuited. If the ignition signal generation circuit 14 is made to generate all the ignition signals in the range of θ 3, the terminal voltage of the charging coil l (
By setting the third set value to a value slightly higher than 2 to 3 V), it is possible to vary the generation position of the ignition signal within the range of 02 in FIG.

When setting the third setting value to such a low value,
As shown in FIG.
As shown in FIG. tb+, a Zener diode 46 and a diode 45 can be connected in series to form a voltage responsive conduction circuit 44B.

Also, if the advance angle range is 03 in Figure 3, it is also possible to use Figure 5 (Figure 5).
Voltage-responsive conduction circuits 44A and '44B shown in al, lb)
In this case, the high voltage responsive short circuit shown in FIG. 1 may not be used.

In each of the embodiments described above, the electronic ignition signal generation circuit 14 which electronically determines the ignition timing by inputting the output signal of the timing sensor 2 was used. An ignition signal generation circuit that applies the control signal may also be used.

In this case, it is suitable for use in a device in which the generation position of the ignition signal is changed by a mechanical governor mechanism, or in a device in which the ignition timing fluctuates due to some reason.

In addition, the present invention is particularly effective when using a multi-pole magnet generator in which the crank angle range per cycle of the charging coil 1 is narrow, but when using a small-pole magnet generator such as 2-pole or 4-pole. is also effective to some extent.

〔Effect of the invention〕

As described above, in the present invention, 1Ili<
, and a voltage-responsive conduction circuit that conducts at a voltage sufficiently lower than the high voltage induced in the charging coil when the short-circuit semiconductor switching element is cut off is inserted into the capacitor charging circuit, so that the charging coil receives a half-wave output on the anti-capacitor charging side. The ignition signal is generated not only when the ignition signal is generated, but also when the output of the charging coil is short-circuited by the shorting semiconductor switching element when the capacitor charging side half-wave output is generated in the charging coil. Also, since the voltage-responsive conduction circuit is cut off, it is possible to prevent the half-wave output on the charging side of the capacitor of the charging coil from being short-circuited due to conduction of the ignition semiconductor switching element. This has the excellent effect of increasing the degree of freedom of selection.

Further, when the high voltage induced in the charging coil exceeds a set value when the short-circuiting semiconductor switching element is cut off, this high voltage is substantially short-circuited by the high-voltage responsive short circuit, and the voltage-responsive conduction circuit is made conductive. By setting the voltage higher than the no-load voltage that occurs following the high voltage in the charging coil when the high voltage response short circuit does not operate when the high voltage is generated, the short circuit semiconductor switching element is cut off. An excellent effect is that the ignition signal can be generated at any position other than when a short voltage is induced in the charging coil, further increasing the degree of freedom in selecting the position at which the ignition signal is generated. There is.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing one embodiment of the device of the present invention, and FIG.
The figure is a bottom view showing a magnet generator applied to the device shown in FIG. 1, FIG. 3 is a waveform diagram of each part to explain the operation of the device shown in FIG. 1, and FIG. 4 is a diagram showing another embodiment of the device of the present invention. Electric circuit diagram, FIG. 5 (al and bl are electric circuit diagrams respectively showing two other embodiments of the voltage-responsive conduction circuit applied to the device of the present invention. ■...Condenser charging coil, 4, 5 ,6.7...
i! 8. Sirisk, a voltage dividing resistor that makes up the disconnection control circuit. -... resistance, 8...Silisk forming a short-circuit semiconductor switching element, 9.10.11... Voltage dividing resistor and Silisk forming a high-voltage responsive short circuit, 13...]
1ndenza, 14...Electronic ignition power generation times v8.1
6...Ignition co-il, 16a...primary secondary 2-r,
16b...Secondary coil, 17...Ignition plug, 18.For ignition? 17 Ignition sirisk forming a conductor switching element, 44, IIA, 44B... Voltage-responsive conduction circuit. Representative Patent Attorney Takashi Okabe Figure 2

Claims (1)

[Claims] (11) A capacitor charging coil of a magnet generator, a short-circuiting semiconductor switching element that substantially shorts the single-power half-wave output of this charging coil, and a short-circuiting semiconductor switching element that causes a short-circuit current to flow through the short-circuiting semiconductor switching element. a cutoff control circuit for cutting off the short-circuiting semiconductor switching element when there is sufficient flow;
A capacitor that is charged by the high voltage induced in the charging coil when the shorting semiconductor switching element is cut off, an ignition coil that has a primary coil and a secondary coil, and a capacitor that is inserted into the charging circuit of the capacitor. , a voltage-responsive conduction circuit that conducts with a voltage higher than the voltage generated by the charging coil when the shorting semiconductor switching element is turned on and sufficiently lower than the high voltage induced in the charging coil when the shorting semiconductor switching element is cut off;
an ignition signal generation circuit that generates an ignition signal at the ignition timing;
an ignition semiconductor switch puffer element that is made conductive by an ignition signal from the ignition signal generation circuit and supplies the charge charged in the capacitor to the primary coil of the ignition coil; and an ignition switch connected to the secondary coil of the ignition coil. A non-contact ignition device for an internal combustion engine, comprising a plug. (2) When a sufficient short-circuit current flows through the capacitor charging coil of the magnet generator, a short-circuiting semiconductor switching element that substantially shorts one half-wave output of this charging coil, and this short-circuiting semiconductor switching element, this occurs. a cutoff control circuit for cutting off the short-circuit semiconductor switching element;
a capacitor charged by a high voltage induced in the charging coil when the short-circuiting semiconductor switching element is cut off; an ignition coil having a primary coil and a secondary coil; a high-voltage responsive short-circuit circuit that detects an induced high voltage and substantially short-circuits the high voltage when the high voltage exceeds a set value; and a semiconductor switching element for short-circuiting that is inserted into the charging circuit of the capacitor. Sufficiently lower than the high voltage induced in the charging coil at the time of interruption, and lower than the no-load voltage generated in the charging coil following the high voltage when the high voltage response short circuit does not operate when this high voltage is generated. A voltage-responsive conduction circuit that conducts with a high voltage, an ignition signal generation circuit that generates an ignition signal at the ignition timing, and an ignition signal from this ignition signal generation circuit conducts to transfer the charge in the capacitor to one of the ignition coils.
A non-contact ignition device for an internal combustion engine, comprising an ignition semiconductor switching element for supplying ignition to a secondary coil, and an ignition plug connected to a secondary coil of the ignition coil.