JPS6214374Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an ignition device for an internal combustion engine.

In the conventional type, an elongated inductor is provided on the rotor side of the magnet generator, and the positive half wave and negative half wave generated in the signal generator at the rising and falling positions of this inductor are used to generate low speed signals. , each fixed area was obtained at high speed.

However, in the conventional type described above, a long and narrow inductor is provided on the outer periphery of the rotor according to the advance angle width, so if the advance angle width is large, a long inductor that matches the angle must be hammered out. However, there was a problem in that the processing technology was difficult.

In order to solve the above problems, this invention adds a signal capacitor to the signal generator and changes the shape of the inductor from an elongated shape (ellipse shape) to two protrusions, making it easier to process the inductor. The purpose is to

The present invention will be described below with reference to embodiments shown in the drawings. In FIG. 1, 2 is a signal generator, 3 is a capacitor charging coil of a magnet generator driven by a 4-cycle internal combustion engine, 4 is a main capacitor, 5 is a main thyristor as a main semiconductor switching element,
6 is an auxiliary thyristor as an auxiliary semiconductor switching element, 7 is a signal capacitor, 8 is a transformer as advance angle signal generating means, 9 is a resistor for adjusting a time constant, and 10 is a resistor. 11 to 17 are diodes, 18 is an ignition coil, and 19 is a spark plug.

Fig. 2 shows the configuration of the peripheral part of the signal generator applied to the device shown in Fig. 1. 1 is the iron bowl rotor of a four-pole magnet generator equipped with a capacitor charging coil 3, and the maximum advance angle of its outer circumference is shown in Fig. 2. There are small circular pin-shaped protrusions 1a and 1b at two locations: the position and the lowest advance angle position.
is provided by stamping. Further, the signal generator 2 includes a magnet 2a, a core 2b, and a signal coil 2c wound around the core 2b, and at a position where the core 2b faces the protrusions 1a and 1b, the signal generator 2 becomes a magnet generator. It is fixed to the stator of. As a result, the signal coil 2c of the signal generator 1 has a third
As shown in Figure a, each time the protrusions 1a and 1b face the core 2b of the signal generator 2, the half-wave outputs α' and β are of one polarity (negative direction) and the other polarity (positive direction).
A one-cycle signal having half-wave outputs α and β' is generated. That is, one cycle each at the maximum advance angle position and the minimum advance angle position per rotation of the rotor 1, a total of 2 cycles.
Generates an intermittent alternating current signal. Also,
Two cycles of continuous alternating current voltage are generated in the capacitor charging coil 3 for each rotation of the rotor 1.

Next, the operation of the above configuration will be explained.
The main capacitor 4 is charged via the diodes 13 and 17 by the positive output of the capacitor charging coil 3, and when a gate signal is applied to the main thyristor 5 at the ignition timing, the main thyristor 5 becomes conductive.
The electric charge charged in the main capacitor 4 is transferred to the ignition coil 1.
By discharging through the primary side of 8, a high voltage is generated on its secondary side, and an ignition spark is generated at the ignition plug 19.

Next, the timing at which this ignition spark occurs, i.e.
Control of ignition timing will be explained. Since the negative direction output of the capacitor charging coil 3 is supplied to the primary side of the transformer 8 via the diode 12, a signal is generated on the secondary side of the transformer 8 every time a negative direction output is generated in the capacitor charging coil 3. , this signal is applied to the gate of the auxiliary thyristor 6 via the diode 11. Furthermore, the negative half-wave outputs α' and β generated in the signal generator 2 are also connected to the diodes 14 and 1.
5 and is applied to the gate of the auxiliary thyristor 6 by a path indicated by a broken line. As a result, the gate of the auxiliary thyristor 6 is supplied with the negative half-wave outputs α' and β of the signal generator 2 and the output obtained by half-wave rectifying the secondary output of the transformer 8 by the diode 11, as shown in FIG. A gate signal shown by is applied. When this gate signal becomes equal to or higher than the gate trigger level V _GT of the auxiliary thyristor 6, the auxiliary thyristor 6 becomes conductive. Further, the signal capacitor 7 is charged by the positive half-wave outputs α and β' generated in the signal generator 2 via the diode 16 through the path shown by the solid line as shown in FIG. 3b. Then, the charge in the signal capacitor 7 is applied as a gate signal to the main thyristor 5 due to the conduction of the auxiliary thyristor 6, thereby making the main thyristor 5 conductive. Here, the electric charge charged in the signal capacitor 7 by the positive direction half-wave output β' generated later in the signal generator 2 at the lowest advance position is discharged through the resistor 9, and the resistance of this resistor 9 is The value is set to such a value that the charge in the signal capacitor 7 is completely discharged by the time the negative half-wave output α' is generated in the signal generator 2 at the maximum advance position. . Therefore, the signal generator 2 at the maximum advance position
Even if the negative half-wave output α' generated first exceeds the gate trigger level V _GT of the auxiliary thyristor 6 and the thyristor 6 becomes conductive, the signal capacitor 7 is not charged, so the main No gate signal is applied to the thyristor 5.

Furthermore, as the voltage generated by the capacitor charging coil 3 increases as the engine speed increases, the secondary output of the transformer 8 increases and its rising slope angle increases. As _the engine speed increases from _{N 1} to N ₂ to N ₃ , _the signal changes as shown in FIG. advance towards.

However, during low speed rotation, the secondary output of the transformer 8 does not reach the gate trigger level V _GT of the auxiliary thyristor 6, as shown in FIG. By making the auxiliary thyristor 6 conductive with the negative half-wave output β generated by the auxiliary capacitor 7, and applying the charged charge of the auxiliary capacitor 7 as a gate signal to the main thyristor 5,
The main thyristor 5 is made conductive and ignited. Here, since the output generated by the signal generator 2 has a waveform with a steep rise, the ignition position in the low speed range is fixed at the lowest advance position where the half-wave output β is generated.

When the rotational speed increases and the secondary output of the transformer 8 exceeds the gate trigger level V _GT of the auxiliary thyristor 6, the auxiliary thyristor 6 becomes conductive as the engine speed increases, as shown in Fig. 3d above. The timing is advanced, and the conduction of the auxiliary thyristor 6 causes the charged charge of the auxiliary capacitor 7 to be applied to the main thyristor 5 as a gate signal, so the conduction timing of the main thyristor 5, that is, the ignition timing is also advanced. When the engine speed exceeds a predetermined value, the auxiliary thyristor 6 becomes conductive earlier than the positive half-wave output α generated at the maximum advance position of the signal generator 2; Since the signal capacitor 7 is not charged before the generation of this half-wave output α, no gate signal is applied to the main thyristor 5 before the generation of this half-wave output α. The ignition position is fixed at the maximum advance position where this half-wave output α is generated. This results in
The ignition advance angle characteristic shown in FIG. 4 is obtained with respect to the engine speed N.

FIG. 5 shows another embodiment of the present invention, in which the auxiliary thyristor 6 is connected to the anode and cathode circuit (main circuit) of the main thyristor 5, in contrast to the one shown in FIG.
The polarity of the signal generator 2 is reversed to generate an output with a polarity opposite to that shown in FIG. Then, the signal capacitor 7 is charged via the diode 16 by the half-wave output in the negative direction, and the charge in the capacitor 7 is transferred to the gate of the main thyristor 5 via the signal generator 2 and the time constant adjustment resistor 9a. It is designed so that the voltage is applied. Note that 10a is a resistor connected between the gate and cathode of the auxiliary thyristor 6.
In the case shown in FIG. 5, the same ignition advance angle characteristic as that shown in FIG. 1 can be obtained.

In each of the above embodiments, one capacitor charging coil 3 is used, but two capacitor charging coils, one for low speed and one for high speed, may be used.

Further, in each of the above-described embodiments, the transformer 8 operated by the negative half-wave output of the capacitor charging coil 3 was used as the advance angle signal generating means. Anything that generates it can be used; for example, a generator coil provided separately from the capacitor charging coil 3 in a magnet generator can be used.

Furthermore, in each of the above embodiments, a thyristor was used as each semiconductor switching element, but
Other semiconductor switching devices such as transistors can also be used.

In each of the above-mentioned embodiments, the present invention was applied to a capacitor discharge type ignition device, but a non-contact type ignition device that has an ignition power source including a magnet generator and determines ignition timing by turning on and off a semiconductor switching element is also applicable. The present invention can be applied to other types of ignition devices as long as they are ignition devices.

As described above, in the present invention, two protrusions made of a magnetic material are provided at two locations on the outer periphery of the rotor of the magnet generator at the maximum advance angle position and the minimum advance angle position, and A signal generator is placed at a position where the protrusions face each other, and the signal generator generates a one-cycle signal having a half-wave output of one polarity and a half-wave output of the other polarity each time these protrusions face each other. The half-wave output of one polarity that occurs first in one cycle of the signal generated in the generator is applied to the signal circuit of the auxiliary semiconductor switching element, and the half-wave output of the other polarity that occurs later is applied to the signal capacitor. Since this charged charge is applied to the signal circuit of the main semiconductor switching element, not only can a single signal generator determine the fixed advance angle at high speed and the fixed advance angle at low speed. The inductor can be easily constructed by punching out two small protrusions on the outer periphery of the rotor, and has the excellent effect of being easy to process.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing one embodiment of the device of the present invention, FIG. 2 is a perspective view schematically showing the configuration around the signal generator in the device shown in FIG.
Waveform diagrams of various parts for explaining the operation of the illustrated device, Part 4
The figure is an ignition advance angle characteristic diagram for the device shown in Figure 1,
FIG. 5 is an electric circuit diagram showing the main structure of another embodiment of the device of the present invention. DESCRIPTION OF SYMBOLS 1... Rotor of magnet generator, 1a, 1b... Protrusion, 2... Signal generator, 3, 4, 13... Capacitor charging coil of magnet generator constituting ignition power supply, main capacitor, diode, 5... ...Main thyristor as main semiconductor switching element, 6...
Auxiliary thyristor as an auxiliary semiconductor switching element, 7... Signal capacitor, 8... Transformer as advance angle signal generating means, 14, 15... Diode, 18... Ignition coil.

Claims (1)

[Scope of utility model registration request] an ignition power source including an ignition coil and a magnet generator;
A main semiconductor switching element for controlling the energy supplied to the ignition coil from the ignition power supply by electrical conduction to generate ignition sparks in the ignition plug, and a main semiconductor switching element connected in series with a signal circuit or a main circuit of the main semiconductor switching element. an auxiliary semiconductor switching element connected to the auxiliary semiconductor switching element, an advance angle signal generation means for generating an advance angle signal whose rise angle changes depending on the engine rotational speed to bring the auxiliary semiconductor switching element into conduction, and a rotor of the magnet generator. Two protrusions made of magnetic material are provided at two locations on the outer periphery, at the maximum advance angle position and the minimum advance angle position, and the protrusions are provided at positions facing these two protrusions. A signal generator that generates a one-cycle signal having a half-wave output of one polarity and a half-wave output of the other polarity; A diode for applying a half-wave output to the signal circuit of the auxiliary semiconductor switching element, and a half-wave output of the other polarity generated later in one cycle of the signal generated in the signal generator, and this charged charge is charged. an ignition device for an internal combustion engine, comprising: a signal capacitor for applying a signal to a signal circuit of the main semiconductor switching element.