JPS6040871Y2 - Internal combustion engine stop device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved structure of an internal combustion engine stopping device.

As shown in FIG. 1, a conventional one-touch stopping device for an internal combustion engine using a magnet generator charges a capacitor 8 by pressing a self-returning manual switch 5 for stopping, and transfers the discharge current of the capacitor 8 to a thyristor 6. is supplied to the gate of the thyristor 6 for a certain period of time to make the anode and cathode of the thyristor 6 conductive for a certain period of time, thereby short-circuiting the power supply and stopping the internal combustion engine.

However, in the conventional device described above, the capacitor 8 is charged via the self-resetting manual switch 5, and the discharged charge of the capacitor 8 is supplied to the gate of the thyristor 6 to make the thyristor 6 conductive. If the thyristor 6 is destroyed for some reason, there is a problem in that the internal combustion engine cannot be stopped even if the self-resetting manual switch 5 is kept pressed.

In order to solve the above problem, the present invention connects a first resistor with a relatively small resistance value to a self-resetting manual switch, and makes the thyristor conductive by the voltage drop that occurs between the terminals of this resistor. A second resistor with a relatively small resistance value is connected in series with the anode/cathode circuit of the thyristor,
By charging the holding capacitor with the voltage drop across this resistor and supplying this charged charge to the anode/cathode circuit of the thyristor as a conduction holding current, self-holding operation during normal stop operation and restart operation immediately after stop are possible. It is an object of the present invention to provide an internal combustion engine stopping device that can stop an internal combustion engine by continuing to press a self-resetting manual switch even when a sirisk is destroyed without causing any damage.

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

In the first embodiment shown in FIG. 2, 1 is an ignition coil (also serves as a generator coil serving as an ignition power source) provided in a magnet generator driven by an internal combustion engine, and 1a and 1b are 1
A secondary coil and a secondary coil, 2 is a circuit breaker that is switched on and off in synchronization with the internal combustion engine, 3 is a capacitor for protecting the contacts of circuit breaker 2, 4
is a spark plug.

5 is a self-resetting manual switch for stopping, 6 is a thyristor, ? , 11, 12.13 are diodes, 8 is a holding capacitor, 9 is a resistor, and 10.21 is a second resistor with a relatively small resistance value.
, the first resistor, and 22 are internal combustion engine stopping devices according to the present invention.

Next, the operation of the above configuration will be explained.

By pressing the self-resetting manual switch 5 to turn it on, a current flows in the path of the primary coil 1a → switch 5 → first resistor 21 → primary coil 1a during the half cycle of the power supply in which the anode side of the thyristor 6 becomes positive. Due to the voltage drop generated between the terminals of the first resistor 21, the diode 7 → thyristor 6 (gate → cathode) → resistor 10
A current flows through the path of → diode 13 → primary coil 1a, and thyristor 6 becomes conductive.

When this thyristor 6 becomes conductive, most of the current from the primary coil 1a flows from the primary coil 1a to the thyristor 6 (anode to cathode) to the second resistor 10 to the diode 13.
→Since the path of the primary coil 1a is almost short-circuited, there is almost no change in the primary current due to the opening and closing of the interrupter 2,
Sufficient high voltage is no longer generated in the secondary coil 1b, causing the spark plug 4 to misfire.

Furthermore, when the thyristor 6 becomes conductive, the voltage drop across the second resistor 10 causes the voltage drop from the cathode of the thyristor 6 to the diode 11.
→Capacitor 8→Diode 13 path connects capacitor 8
is charged to the polarity shown.

Furthermore, when the switch 5 is turned off, the electric charge charged in the capacitor 8 is transferred from the capacitor 8 (+ side) → the resistor 9 → the diode 12 → the thyristor 6 (anode → cathode) → the second resistor 10 → the capacitor 8 (one side) is discharged by the circuit of
In order to supply the holding current to the thyristor 6, the thyristor 6
is maintained in a conductive state for a time constant time by capacitor 8 and resistor 9.degree. 10.

Here, since a forward voltage is periodically alternately generated in the primary coil 1a with respect to the thyristor 6, the time constant of the capacitor 8 and resistors 9, 10 that maintain the conduction state of the thyristor 6 is set to a rotation speed that allows the engine to be stopped. By setting the number of cycles to one cycle or more, when the thyristor 6 is forward biased, the capacitor 8 is recharged by the voltage drop across the second resistor 10, and thereafter, the charging → holding current supply is repeated until the engine stops. The current from the coil 1a is continued to be short-circuited by the thyristor 6.

After the engine stops, no voltage is generated in the primary coil 1a and the capacitor 8 is no longer charged, so the capacitor 8
The thyristor 6 is turned off when the charged charge decreases below the holding current in a short period of time.

Thereby, the internal combustion engine can be restarted immediately after being stopped.

In addition, even if the thyristor 6 is destroyed for some reason, by continuing to press the self-recovery manual switch 5,
Most of the current from the primary coil 1a flows through the primary coil 1.
a → stop switch 5 → first resistor 21 → primary coil 1a
The internal combustion engine can be stopped because the path continues to be short-circuited.

Here, the first resistor 21 is connected to the gate of the thyristor 6, and the capacitor 8 is charged by the voltage drop of the second resistor 10 connected in series with the anode/cathode circuit of the thyristor 6, and this charged charge is transferred. Since it is supplied to the anode of the thyristor 6 to maintain continuity, the first resistor 21
does not adversely affect the charging and discharging of the capacitor 8.

Therefore, the first resistor 21 does not impair the self-holding operation of the thyristor 6 during normal stopping operation or the restarting operation immediately after stopping.

FIG. 3 shows a second embodiment in which the present invention is applied to a non-contact type ignition device using a transistor 14 and a transistor control circuit 15 instead of the interrupter 2.

Figure 4 shows a third embodiment in which the present invention is applied to a capacitor charging/discharging type ignition device, in which 16 is a diode, 17 is a capacitor, 18 is a thyristor, 19 is a thyristor control circuit, and 20 is a magnet generator power generator. Ignition coil 1' with coil
is provided outside the magnet generator, separate from the generator coil 20.

As described above, in this invention, when the self-resetting manual switch is pressed and the generated output of the generating coil becomes positive, the thyristor immediately becomes conductive and the thyristor for stopping the engine is turned on until the engine is surely stopped. The engine can be stopped reliably due to continuous conduction, and the time constant of the discharge circuit of the holding capacitor that supplies holding current to the thyristor for stopping the engine can be one cycle or more at the engine speed that can be stopped. Therefore, even if the engine is restarted immediately after stopping, the charge in the holding capacitor will be completely discharged before attempting to restart, so there will be no problem in restarting the engine. This has an excellent effect.

In addition, since the holding capacitor is charged by the voltage drop of the second resistor with a small resistance value only when it is desired to stop, there is no loss of ignition energy associated with charging this capacitor, and the withstand voltage of the holding capacitor is also small. It has an excellent effect that it can be used with anything.

Furthermore, it has the excellent effect of being able to stop the internal combustion engine by continuing to press the self-resetting manual switch even in the event of a thyristor failure, without impairing the self-holding operation during normal stopping operation or the restarting operation immediately after stopping. be.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram showing a conventional device, and FIGS. 2 to 4 are electrical circuit diagrams showing first to third embodiments of the device of the present invention, respectively. 1... Ignition coil that also serves as the generating coil of the magnet generator, 5... Self-resetting manual switch for stopping, 6... Thyristor, 8... Holding capacitor, 10... Second resistor, 20...
... Generator coil of magnet generator, 21 ... First resistor, 22 ... Internal combustion engine stop device.

Claims (1)

[Scope of utility model registration request] Between the terminals of the generating coil of the magnet generator that serves as the ignition power source, there is a self-resetting manual switch for stopping and a first switch with a relatively small resistance value.
At the same time, a series circuit is connected between the anode/cathode circuit of Cyrisk and a second resistor having a relatively small resistance value, and the connection point between the switch 5 and the first resistor is connected. A holding capacitor connected to the gate of the thyristor and charged by a voltage drop across the second resistor is connected between terminals of the second resistor;
An internal combustion engine stopping device characterized in that the charge charged in the capacitor is supplied as a conduction holding current to the anode/cathode circuit of the thyristor.