JPH0119072B2 - - Google Patents

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 order to make the charging voltage of the ignition capacitor almost uniform from low to high engine speeds, the charging source for the capacitor used a thin wire with a large number of turns, and the capacitor was used mainly at low speeds. It consisted of a low-speed coil for charging, 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.
In addition, the magnet generator was provided with a power generating coil that served as a charging source for the ignition capacitor and a power generating coil that supplied power to other loads such as a battery, respectively.

However, the above-mentioned conventional system (1) requires two coils with different specifications for low-speed and high-speed use as the capacitor charging coil, resulting in a complicated structure. Moreover, the dimensions become larger and the size of the magnet generator becomes larger.

(2) The low-speed charging coil is a thin wire (wire diameter 0.13 to 0.16
mm) are wound in large numbers (3000 to 7000 turns), resulting in poor workability and quality problems.

(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 increase, and the withstand voltage of the ignition coil or semiconductor element will be insufficient.

(4) In addition to the generator coil that serves as a charging source for the ignition capacitor, a separate generator coil with different specifications is required to supply power to other loads such as a battery, which not only makes the generator structure even more complex. , The power generation effect of the generator is also poor. There are problems such as.

In order to solve the above problem, the present invention substantially short-circuits one half-wave output of the generating coil by a first short-circuit connected in parallel with the ignition capacitor. The ignition capacitor is charged by the high voltage of one polarity induced in the generator coil when the short circuit is interrupted, and when the high voltage exceeds a predetermined value, this output is supplied to other loads such as batteries. Furthermore, the other half-wave output of the generator coil is substantially short-circuited by a second short circuit, and the high voltage of the other polarity induced in the generator coil when the second short circuit is interrupted is By supplying power to other loads such as batteries, the generator coil with a large wire diameter and a small number of turns can charge the capacitor well, and also supply power to other loads such as batteries. The present invention aims to not only simplify the structure of the generator, but also improve the power generation efficiency of the generator.

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

First, in the embodiment shown in FIG.
Those with a number of turns of 200 to 600 are used, and in a magnet generator of the same size, the wire diameter is about 4 times thicker than that of a conventional capacitor charging coil, and the number of turns is about 1/10. 2 is a timing sensor that generates an output signal at a reference position, 3a and 3b are charging coils 1
Reverse half-wave output diodes 4a, 4b, 5a, and 5b are connected between the terminals of the generator coil 1 via respective diodes 3a and 11a to extract the reverse half-wave output and supply it to the battery 20, as indicated by the broken line arrow. Two sets of voltage dividing resistors connected in series, their voltage dividing points a ₁ and a ₂
are connected to the gates of each thyristor 6a, 6b. The thyristors 6a, 6b are connected between the base and emitter of the transistor 8 via diodes 31a, 31b. Reference numerals 7a and 7b are base resistors of the transistor 8. This resistor 7a, the thyristor 6a, and the resistors 4a and 5b constitute a first cutoff control circuit, and the resistor 7b and the thyristor 6
b and resistors 4b and 5b constitute a second cutoff control circuit. Further, the transistor 8 is connected between each terminal of the coil 1 and the ground via each diode 32a, 32b, and the diode 32a and the transistor 8 constitute a first short circuit, and the diode 32b and the transistor 8 constitute a first short circuit. 2 short circuits are constructed. 9 and 10 are thyristors 11
A voltage dividing resistor is connected in series between the terminals of the voltage dividing resistor, and its voltage dividing point b is connected to the gate of the thyristor 11. When the positive direction generated voltage shown by the solid line arrow of the coil 1 after the transistor 8 is turned off exceeds the set value, the thyristor is activated. 11 is made conductive. The positive half-wave output of the power generating coil 1 indicated by the solid arrow is supplied to the battery 20 via the thyristor 11, the diode 11b, and the diode 11a. And this thyristor 11, resistor 9,
10 constitutes a high voltage responsive half wave extraction circuit. 12 is a discharge blocking diode, 13 is an ignition capacitor, and 14 uses the positive output of the generating coil 1 as a power source, and uses the output signal of the timing sensor 2 as input to electronically determine the ignition timing and generate an ignition signal. This is a known electronic ignition signal generation circuit. 15 is a DC arc diode, 16 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.When an ignition signal from the ignition signal generation circuit 14 is applied to the gate, the thyristor becomes conductive and transfers the charge in the capacitor 13 to the ignition coil 16. It is supplied to the primary coil 16a. 22 is a known regulator that short-circuits each half-wave output of the generator coil 1 when the negative direction output of the generator coil 1 indicated by the broken line arrow and the cathode voltage of the thyristor 11 exceed the set battery charging voltage.

Next, the magnet generator used in this example includes a rotor magnetized with 12 poles of N and S alternately magnetized at equal intervals, and a ring-shaped stator core with 12 protrusions formed at equal intervals 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 1 receives 6 cycles of no-load per rotation of the rotor of the magnet generator. AC voltage is generated.

Now, when a half-wave output starts to be generated in the generator coil 1 in the direction of the solid arrow in Fig. 1 (positive direction), the coil 1→
A base current flows to transistor 8 in the circuit of resistor 7a → diode 31a → base and emitter of transistor 8 → ground → diode 11a, conduction occurs between the collector and emitter of transistor 8, and the positive half-wave output of coil 1 is short-circuited. be done. At this time, as the short-circuit current of the transistor 8 increases, the voltage drop between the diode 32a and the collector-emitter of the transistor 8 increases, and the resistor 4
The voltage at the connection point _a1 of the voltage divider circuit consisting of a and 5a increases. This voltage is the set value (e.g. short circuit current
When the voltage value (corresponding to 0.5 to 4 A) is reached, the thyristor 6a becomes conductive and short-circuits the base and emitter of the transistor 8, so that the collector-emitter of the transistor 8 is turned off and the short-circuit current is abruptly cut off. At this time, a large induced voltage in the positive direction is generated in the coil 1, and this high voltage causes the capacitor 13 to be connected to the coil 1 → diode 12 → capacitor 13 → diode 15 → ground → diode 11.
Charge the battery sufficiently using circuit a. Further, when the induced voltage exceeds a set value (for example, 100 to 300 V), the voltage at the connection point b of the voltage dividing circuit made up of resistors 9 and 10 increases, and the thyristor 11 becomes conductive. This results in
The positive half-wave output of the coil 1 is supplied to the battery 20 via the thyristor 11, the diode 11b, and the diode 11a, and the battery 20 is charged. By charging the battery 20 in this manner, the positive half-wave output of the coil 1 is suppressed to the battery charging voltage, thereby preventing overvoltage to be applied to each element.

On the other hand, when a half-wave output starts to be generated in the generator coil 1 in the direction of the dashed arrow (negative direction) in FIG.
In this circuit, a base current flows through transistor 8, conduction occurs between the collector and emitter of transistor 8, and the negative half-wave output of coil 1 is short-circuited. At this time, as the short circuit current of transistor 8 increases,
Diode 32b, collector of transistor 8
The voltage drop between the emitters increases, and the resistor 4b,
The voltage at the connection point _a2 of the voltage divider circuit consisting of 5b increases. This voltage is set value (e.g. short circuit current is 0.5~
When the voltage value corresponds to 4A), thyristor 6b
conducts and short-circuits between the base and emitter of transistor 8, so that the collector-emitter of transistor 8 is turned off and the short-circuit current is abruptly cut off. At this time, a large negative induced voltage is generated in the coil 1, and this high voltage causes the diodes 3a,
3b to charge the battery 20. By charging the battery 20 in this manner, the negative half-wave output of the coil 1 is suppressed to the battery charging voltage, thereby preventing overvoltage to be applied to each element.

Also, the negative direction output of the generator coil 1 is set to the set battery charging voltage (for example, the rated voltage of the battery 20).
When the voltage exceeds 12 V (approximately 14 V), the regulator 22 operates to short-circuit the negative half-wave output of the generator coil 1 to prevent the battery 20 from being overcharged.

Further, when the cathode voltage of the thyristor 11 exceeds the set battery charging voltage (for example, about 14V), the regulator 22 operates and the generator coil 1
The positive half-wave output of the thyristor 11 and the diode 11a are short-circuited to prevent the battery 20 from being overcharged. Here, the diode 11b prevents the battery 20 from being shorted through the regulator 22 when the regulator 22 is in operation.

Further, when the ignition timing comes, the thyristor 18 is made conductive by the output of the timing sensor 2 and the ignition signal determined electronically by the ignition signal generation circuit 14, and the charge in the capacitor 13 is transferred to the capacitor 13.
→ Thyristor 18 → Earth → 1 of ignition coil 16
A sudden discharge is caused in the circuit of the secondary coil 16a, a high voltage is obtained in the secondary coil 16b of the ignition coil 16, and an ignition spark is generated at the ignition plug 17.

Here, the ignition signal generated in the ignition signal generation circuit 14 is generated when the half-wave output not supplied to the ignition power source is generated in the generator coil 1 as indicated by the broken line arrow in FIG. is preferred. This is because when the thyristor 18 is turned on by the ignition signal while the coil 1 is generating a half-wave output in the direction of the solid arrow, this half-wave output is short-circuited by the thyristor 18, and the battery charging current is reduced accordingly. This is to prevent this.

The other embodiment shown in FIG. 2 is different from the embodiment shown in FIG. The diodes 31a, 31b, 32a, 32b constitute a short circuit.
is omitted.

In each of the embodiments described above, the battery 20 is used as another load, but a load such as a headlamp may also be used.

Furthermore, in each of the embodiments described above, the coil 1
When the positive induced voltage of thyristor 1 reaches the set value,
1 is made conductive, but the thyristor 11 may be made conductive by the peak point detection circuit immediately after the positive direction induced voltage of the coil 1 exceeds the peak point.

Further, 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, but the output signal of the timing sensor 2 is directly input to the thyristor 18 An ignition signal generation circuit that applies the control signal may also be used.

As described above, in the present invention, when a short circuit current due to the half-wave output on the capacitor charging side of the generating coil is sufficiently flowing through the first short circuit that substantially short-circuits one half-wave output of the generating coil, 1st
The capacitor is charged by the high voltage of one polarity induced in the generator coil when the first short circuit is interrupted, so that the following is described. It has excellent effects.

(1) Conventionally, a capacitor charging coil required two coils with different specifications: a thin wire coil with a large number of turns and a thick wire coil with a small number of turns, but it is now possible to use only a thick wire coil with a small number of turns. The structure is simple and the body size can be reduced.

(2) There is a large degree of freedom in setting the capacitor voltage and secondary voltage, 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.

Furthermore, in the present invention, the high voltage induced in the generator coil is detected when the first short circuit is interrupted, and the generator coil is detected every time this high voltage exceeds a set value or immediately after exceeding the peak point. A short-circuit current flows through a second short-circuit circuit that continues to supply one half-wave output to other loads such as a battery through a high-voltage responsive half-wave extraction circuit, and substantially short-circuits the other half-wave output of the generator coil. When the flow is sufficient, the second
It is equipped with a second cutoff control circuit for breaking the short circuit of The generated output of the generator coil, which serves as the charging source for the capacitor, can be effectively used to supply sufficient power to other loads such as batteries, and the structure of the generator can therefore be simplified. First, it has the excellent effect of improving the power generation efficiency of the generator.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing one embodiment of the apparatus of the present invention, and FIG. 2 is an electric circuit diagram showing another embodiment of the apparatus of the present invention. 1...Generating coil, 3a, 3b...Half wave extraction diode, 4a, 4b, 5a, 5b, 6a,
6b, 7a, 7b, 31a, 31b...Voltage dividing resistor, thyristor, base resistor, diode, 8, 8a, 8b, which constitute the first and second cutoff control circuits.
32a, 32b...Transistors and diodes forming the first and second short circuits, 9, 10, 11
...Voltage dividing resistor and thyristor constituting the high voltage response half-wave extraction circuit, 12...Discharge blocking diode,
13...Ignition capacitor, 14...Electronic ignition signal generation circuit, 16...Ignition coil, 16a...
...Primary coil, 16b...Secondary coil, 17...
Spark plug, 18...Ignition thyristor forming a semiconductor switching element for ignition, 20...Battery.

Claims (1)

[Claims] 1. A first short circuit that substantially shorts the generating coil of the magnet generator and one half-wave output of this generating coil, and when a short circuit current is sufficiently flowing through this first short circuit, this first short circuit a first cutoff control circuit for breaking the short circuit; an ignition capacitor charged by a high voltage induced in the generator coil when the first short circuit is broken; a primary coil; The high voltage induced in the ignition coil having a secondary coil and the generating coil when the first short circuit is interrupted is detected, and the high voltage is detected every time this high voltage exceeds a set value or immediately after exceeding a peak point. A high-voltage responsive half-wave output circuit for continuing to supply one half-wave output of the generating coil to other loads such as a battery, and a second short circuit that substantially short-circuits the other half-wave output of the generating coil. a second cutoff control circuit for cutting off the second short circuit when a sufficient short circuit current is flowing through the second short circuit; and a high voltage induced when the second short circuit is cut off. a reverse half-wave extraction diode for supplying the other load, a discharge blocking diode connected in series in the charging circuit of the capacitor, and an ignition signal generation circuit that generates an ignition signal at the ignition timing; an ignition semiconductor switching element that is electrically connected by an ignition signal from the ignition signal generating circuit to supply the charge charged in the capacitor to the primary coil of the ignition coil; and an ignition plug connected to the secondary coil of the ignition coil. A non-contact ignition device for an internal combustion engine, comprising: