JPH0322552Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an internal combustion engine ignition device that prevents malfunctions that occur when the internal combustion engine is reversed.

[Conventional technology]

Figures 4 and 5 are for example Jitsukō 53-25054.
This figure shows a conventional internal combustion engine ignition device disclosed in the publication. In Fig. 4, 1 is a flywheel that rotates in synchronization with the engine, and 1a is a flywheel 1.
The protrusion 2 provided on the protrusion 1a is a pickup that generates an advance angle signal and a retard angle signal in response to changes in the magnetic field caused by the protrusion 1a, and is composed of a magnet and a coil (not shown). Further, in FIG. 5, reference numeral 3 denotes a power generation coil housed in a magnet generator that generates an electromotive force according to the rotation of the engine; 5 is connected to the power generation coil 3 via a diode 4; 3 is a capacitor that charges the ignition voltage; 7 to 10 are diodes that rectify the AC voltage generated in the pickup 2;
The anode of the diode 8 and the cathode of the diode 8 are connected to one end of the pickup 2, and the anode of the diode 9 and the cathode of the diode 10 are connected to the other end of the pickup 2, and the anodes of the diodes 8 and 10 are grounded. 11 is a resistor whose one end is connected to the diode 7, and 6 is a thyristor that discharges the electric charge of the capacitor 5 to the ignition coil 12.The other end of the resistor 11 is connected to the gate of this thyristor 6, and its anode is connected to the diode. 4 and the capacitor 5, and its cathode is grounded.

Next, the operation of the internal combustion engine ignition system configured as described above will be explained. Assuming that the flywheel 1 is rotating clockwise in FIG. 4, the pickup 2 at positions A and B generates positive and negative voltages as shown at A in FIG. 6, respectively. A positive voltage as an advance signal is applied to the gate of thyristor 6 through diodes 7 and 10 and a resistor 11, and a negative voltage as a retard signal is applied to the gate of thyristor 6 through diodes 8 and 9.

When the engine is started, the rotation of the flywheel 1 is low, so the output voltage of the pickup 2 is also low.
The positive voltage that is the advance signal of the pickup 2 is limited by the resistor 11 and cannot reach the trigger voltage V _T of the thyristor 6 as shown in B in FIG. 6, and the thyristor 6 is triggered by the negative voltage that is the retard signal. conducts and generates ignition voltage at the retard position to start the engine.

After the engine starts, the positive voltage that is the advance angle signal increases as the rotation increases and becomes the trigger voltage of thyristor 6 V _T
When the engine reaches the advanced angle position, the thyristor 6 is triggered by the advance angle signal and the ignition voltage is generated at the advanced angle position, so that the engine rotates more stably.

[Problem that the invention attempts to solve]

A conventional internal combustion engine ignition system is configured as described above, and the retard signal is generally set near the top dead center of the engine in consideration of startability. Therefore, at the time of starting, if the engine does not go over the B position where the retard signal occurs from the A position in Figure 4 and is reversed again to the A position due to the compression pressure of the engine, as shown in Figure 6 C. Advance angle position during forward rotation (Fig. 4 A)
A reverse retardation signal is generated at. Since this signal is in the same direction as the retard signal during forward rotation, thyristor 6 is triggered (Fig. 6D) and ignition voltage is generated, and this position is after top dead center in the reverse direction of the engine. There were problems with improper explosions and problems with the butthole, backfire, etc.

This invention was made to solve the above-mentioned problems, and the object is to provide an internal combustion engine ignition system that can prevent incorrect ignition that causes sparking, backfire, etc. at the time of starting.

[Means for solving problems]

The internal combustion engine ignition device according to this invention includes a first signal generating means that generates an advance signal, and a second signal generator that generates a retard signal and does not generate the retard signal when the engine is reversed after generation of the advance signal. The engine is equipped with a signal generating means and an ignition means which generates an ignition voltage based on these output signals by means of a retard signal when starting the engine.

[Effect]

In the internal combustion engine ignition system of this invention, when the engine is reversed after the advance angle signal is generated, the second signal generation means does not generate the retard signal, so the ignition means does not generate the ignition voltage, and the ignition means does not generate an ignition voltage. No explosion occurs.

〔Example〕

FIGS. 1 and 2 are a block diagram and a circuit diagram of an internal combustion engine ignition system according to an embodiment of this invention. In these figures, 1 to 7, 9, 11, 1
2 is similar to the conventional device shown in FIGS. 4 and 5, so corresponding parts are given the same reference numerals and their explanation will be omitted. A second pickup 13 is a second signal generating means for generating a retard signal using a protrusion 1a, one end of which is connected to the gate of the thyristor 6 via a diode 9, and the other end is grounded. That is, the advance angle signal generated from the first pickup 2, which is the first signal generation means, provides a gate signal to the thyristor 6 through the diode 7 and the register 11, and the retard signal generated from the second pickup 13 is applied to the diode 9. It is configured to apply a gate signal to the thyristor 6 through the thyristor 6.

Next, the operation of the internal combustion engine ignition system having such a configuration will be explained. In FIG. 1, if the flywheel 1 is rotating clockwise in the drawing, the first pickup 2 will have a negative voltage and an advance angle signal as shown at 3A in FIG. 3 at positions 1A and 1B. Generates a voltage of Also, the second pick-up 1
3 generates a positive voltage and a negative voltage that become a retard signal as shown in 3B in FIG. 3 at positions 1C and 1D. The gate of the thyristor 6 receives an advance angle signal from the first pickup 2, and an advance angle signal from the second pickup 2.
Retard signals are applied from the pick-up 13,
A gate voltage shown at 3C in FIG. 3 is generated. The advance angle signal is limited by the register 11 and cannot reach the thyristor trigger voltage V _T when the engine is started.
The engine is started using the ignition voltage provided by the retard signal.

On the other hand, if the engine cannot overcome compression top dead center and reverses when starting, the first pick-up 2 will have a
A voltage shown at 3D in FIG. 3 is generated at a position corresponding to A→1B→1B→1A. The second pickup 13 also has a protrusion 1a of the flywheel 1.
are not close to each other and no signal voltage is generated as shown in FIG. 3E, so the gate voltage of the thyristor 6 does not reach the trigger voltage V _T as shown in FIG. 3F, and therefore the thyristor 6 does not conduct. The engine will not explode unexpectedly when reversed. In addition,
In the above embodiment, the ignition device performs jump advance by applying advance angle signal and retard angle signal to the gate of thyristor 6, but electronic advance angle ignition system performs advance angle calculation continuously using advance angle signal as calculation input. Similar effects can be achieved with the device.

[Effect of idea]

As described above, according to the internal combustion engine ignition system of this invention, the second signal generation means is provided, and when the engine cannot overcome compression top dead center and reverses after generating the advance signal, the retard signal is generated. Since the structure is configured to prevent this from occurring, it is possible to prevent an unauthorized explosion from occurring when the engine starts poorly.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an internal combustion engine ignition system according to an embodiment of this invention, Fig. 2 is a circuit diagram of the internal combustion engine ignition system, Fig. 3 is an operating waveform diagram of the internal combustion engine ignition system, and Fig. 4 is a diagram of the internal combustion engine ignition system. A configuration diagram of a conventional internal combustion engine ignition system,
FIG. 5 is a circuit diagram of the internal combustion engine ignition system, and FIG. 6 is an operating waveform diagram of the internal combustion engine ignition system. 1... Flywheel, 2... First pick-up, 3... Generator coil, 5... Capacitor, 6...
...Thyristor, 12...Ignition coil, 13...Second pick-up. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] The first one generates an advance angle signal in synchronization with the rotation of the engine.
a second signal generating means that generates a retard signal in synchronization with the rotation of the engine and does not generate the retard signal when the engine reverses after generating the advance signal; and an ignition device for generating an ignition voltage using the retard signal to start the engine when starting the engine, based on the output signal of the second signal generation device.