JPS603484A - Internal-combustion engine stopping device - Google Patents

Abstract

PURPOSE:To provide a small capacity capacitor by providing an engine stopping capacitor for discharging only for a half cycle period of one of an exciter coils. CONSTITUTION:An emitter of PNP transistor 16 is connected to an end of an engine stopping capacitor 9 at the non-earth side, and a collector of this transistor 16 connected to a gate of an engine stopping thyristor 7 through a resistance 8. Also, to the base of the transistor 16 is connected the collector of NPN transistor 18 through a resistance 17 and the emitter of the transistor 18 is earthed. And by the transistors 16, 18 and resistance 17, 19 is formed a discharge controlling switch circuit for conducting current only for a half cycle period conributing to ignition operation of one of exciter coils 6 and allowing the capacitor 9 to discharge through the resistance 8 and a gate cathode of the thyristor 7. Thus, the capacity of the capacitor 9 can be substantially reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for stopping an internal combustion engine.

Conventional technology For equipment that emphasizes ease of operation, such as agricultural equipment and small engine power generation, a magnet generator is constantly connected to the ignition circuit of the internal combustion engine without using a key switch, and rope starts or kick starts are used. This allows for immediate start-up.

If the power source is always connected to the ignition circuit in this way, special means 674 must be taken to stop the engine. Figure 1 shows an example in which the stop device proposed earlier by the present applicant (Utility Model Application No. 126187/1987) is applied to an engine using a capacitor discharge type ignition system. An ignition coil 2 is attached to a cylinder of an engine (not shown) and connected in parallel to both ends of the secondary coil. Reference numeral 3 denotes an ignition energy storage capacitor whose one end is connected to the non-grounded terminal of the primary coil 1a, and a capacitor discharging control capacitor whose cathode faces the grounding side is connected to both ends of the series circuit between the capacitor and the primary coil. Thyristors 4 are connected in parallel. The cathode of a diode 5 is connected to the connection point between the Nyristor 4 and the capacitor 3, and the other end of an exciter coil 5 serving as an ignition power supply coil whose one end is grounded is connected to the anode of the diode 5. The above-mentioned parts constitute a capacitor discharge type ignition device.

In this ignition system, the exciter coil 6 is placed in a magnet generator (not shown) driven by the engine, and generates an alternating current voltage in synchronization with the rotation of the engine. When the exciter coil 6 generates a voltage in the direction of the arrow shown in the figure, the diode 5
through which the capacitor 3 is charged to the polarity shown. Next, when an ignition signal is applied to the thyristor 4 from a signal coil (not shown), the thyristor 4 becomes conductive, and the charge in the capacitor 3 is discharged through the thyristor 4 to the primary coil 1a.

This causes a large magnetic flux change in the iron core of the ignition coil, and a high voltage is generated in the secondary coil.

Therefore, a spark is generated in the spark plug 2, and the spark plug is ignited.

In order to stop the engine, a thyristor 7 for stopping the engine is connected in parallel to the thyristor coil 6, and a capacitor 9 for stopping the engine is connected to the gate of the thyristor 7 via a resistor 8 as a current limiter. One end is connected.

The other end of the capacitor 9 is coupled to the cathode of the silice 7, and the connection point between the capacitor 9 and the resistor 8 is connected to the cathode of a diode 1o. The anode of the diode 10 is connected to one end of a stop command switch 11, and the other end of the switch 11 is connected to the non-ground terminal of the exciter coil 6. The exciter coil 6 (
An initial charging circuit that charges the capacitor 9 from the power supply coil side is configured, and this circuit, the thyristor 7, the resistor 8, and the capacitor 9 constitute an internal combustion engine stop device 12.

When the switch 11 is closed in the above stop device,
A voltage of the polarity shown is generated in the exciter coil 6, and the capacitor 9 is charged to the polarity shown through the diode 10. When capacitor 9 is fully charged, resistor 8
The exciter coil 6 is short-circuited through the thyristor 7 because the ignition signal is given to the thyristor 7 through the thyristor 7 and the thyristor 7 passes through the thyristor 7 . Therefore, charging of the condenser υ3 is blocked and ignition operation is blocked, causing the engine to misfire and its rotational speed to decrease. When the thyristor 7 becomes conductive, the voltage drop between the gate and cathode of the thyristor charges the capacitor 9 through the resistor 8 to the polarity shown. capacitor 9
starts discharging through the resistor 8 when the voltage between the gate and cathode of the thyristor 7 exceeds its peak. The 111 voltage time constant of this capacitor is set so that the discharge continues until the output of the half cycle of the condensate which generated the output of the half cycle in the direction opposite to the arrow shown in the figure from the exhaust to no iter coil 6 rises. Therefore, when an output in the direction of the arrow shown in the figure is generated in the exciter coil, an ignition signal is given to the iris, causing the iris to become conductive. The capacitor 9 is charged again by this conduction of the cyrisk 7, and the above-mentioned operation is repeated. Therefore, while the engine is rotating and a voltage is induced in the exciter coil, the thyristor 7 repeatedly conducts and continues to short-circuit the exciter coil during the half cycle of the exciter coil in the direction of the arrow shown (the half cycle that contributes to the ignition operation). , prevents the ignition operation and stops the crotch.

According to the engine stopping device described above, since a self-reset switch can be used as the switch 11, the stopping device does not operate when restarting the engine, and there is no problem in starting the engine. . However, in the above device, it is necessary to sustain the discharge of the engine stop capacitor 1 and 9 during the half-noise cycle in the direction opposite to the direction of the arrow shown in the diagram of the exciter coil, so the discharge time constant of the capacitor is increased. Therefore, it is necessary to increase the resistance value of the resistor 8. Therefore, it is not possible to increase the charging voltage when charging the capacitor 9 due to the voltage between the gate and cathode of the thyristor 7, and in order to ensure the discharge duration of the capacitor 9, it is necessary to increase the capacitance of the capacitor. there were.

OBJECTS OF THE INVENTION An object of the present invention is to provide an internal combustion quantity stop device that can charge an engine stop condenser to a sufficiently high voltage and thereby reduce the capacity of the capacitor. be.

Structure of the Invention The present invention provides a power supply coil for an ignition device for an internal combustion engine in which the power supply coil is oriented in such a direction that a forward voltage is applied between an anode and a cathode with the output of one half-four-noise contributing to the ignition operation of the power supply coil. An engine stop Nyristor connected in parallel,
an engine stop capacitor connected between the gate cathode of the thyristor via a current limiting element and charged by a voltage drop between the gate cathode of the thyristor; and a stop command switch that is closed when stopping the internal combustion chamber. ,
An internal combustion engine stop device comprising: an initial charging circuit that charges the content 1 from the power supply coil side when the stop command switch is opened; A discharge control switch is connected between the capacitor j and the current limiting element, which conducts only during the cycle and allows discharge to occur between the capacitor j to the current limiting element and the gate horn of the first Noiristor. A guide A-de inserted between the two and having an anode directed toward the go-I side of the silice is connected in parallel to the discharge limiting switch.

With the above configuration, the engine stop capacitor discharges only during the period of one half of the exhaust coil (half one cycle that contributes to ignition operation), so the capacitance of the capacitor is significantly smaller than that of conventional capacitors. can be used.

Example Detailed description of the present invention is given below with reference to the accompanying drawings. do.

FIG. 2 shows an embodiment in which the present invention is applied to a stop device of the type shown in FIG. 1. In FIG. 2, parts equivalent to those in FIG. It is. In this embodiment, a resistor 14 having a sufficiently small resistance value is inserted between the cathode of the engine stop thyristor 7 and the ground, and a resistor 15 is connected in parallel to both ends of the series circuit of the diode 10 and the engine stop capacitor 9. There is. Conden +19
The emitter of a PNPI resistor 16 is connected to one end of the non-grounded side of the transistor 1, and the collectors of the resistor 1 to transistor 16 are connected to the gate of the engine stop thyristor 7 via a resistor 8 as a current limiting element. NPN1 to transistor 18 are connected to the bases of transistors 1 to 16 through resistors 17.
The collector of the transistor is connected, and the emitter of the transistor is grounded. The base of the transistor 18 is connected to the cathode of a diode 20 via a resistor 19, and the anode of the diode 20 is connected to the non-grounded terminal of the exciter coil 6. In this embodiment, the transistor 16, 18 and the resistor 17, 19 conduct the exciter coil 6 only during one half cycle (the half cycle contributing to the ignition operation), and the capacitor 9 connects the resistor 8 and the thyristor 7. 111. Allow discharge between Goo 1 and Power Sword. The switch circuit for the electrical control section is configured (in this embodiment, the gate of the thyristor 7 connects to the capacitor via the diode 22 whose anode is directed toward the side of the thyristor 7). It is connected to one end of 9. Other parts are 4111 similar to the device in Figure 1.
has been completed.

In the embodiment described above, the ignition operation is similar to the device of FIG. When the stop command switch 11 is listening, the capacitor 9 is not charged and the transistor 16 is not conductive! No firing signal is given to the thyristor 7. Therefore, the intercondylar firing is interrupted before the failure. In order to avoid stopping the engine, when the stop command switch 11 is closed, when a voltage is generated in the exciter coil 6 in the direction of the arrow shown in the figure, the capacitor 9 is charged through the diode 10 to the polarity shown in the figure. At this time, a base current flows from the exciter coil 6 to the transistor 19 through the diode 20 and the resistor 19, and an emitter current flows to the transistor 16 through the switch 11 and the diode 10, so that the transistors 16 and 18 become conductive and the thyristor 7 becomes An ignition signal is given to 1 to 1. The thyristor 7 is therefore conductive and the exciting coil 6 is essentially short-circuited through the thyristor and the small resistor 14. This prevents capacitor 3 from charging, causing the 81st valve to misfire. When the Lee iris resistor 7 becomes conductive, a voltage equal to the sum of the voltage drop across the Goomil cathode and the voltage drop across the resistor 14 is applied to the capacitor 9 through the diode 22.
is charged to the polarity shown.

Since the resistance value of the resistor 14 is small and the charging time constant of the capacitor 9 is small, the capacitor 9 is charged to a high voltage approximately corresponding to the peak voltage between the gate and cathode of the thyristor 7. Next, during the half cycle in which a voltage with a polarity opposite to the direction of the arrow shown in the figure is generated in the exciting coil 6, no base current is applied to the transistor 19, and both transistors 16 and 19 are in a cut-off state.
Capacitor 9 is not discharged, and the terminal voltage of the capacitor remains charged. Next] - Kiri ° Ita coil 6
When a voltage is generated in the direction of the arrow shown in the figure, transistors 16 and 19 become conductive as described above, so that the capacitor
A charge of 9 is discharged to the gate of the thyristor 7 through the transistors 1 to 16 and the resistor 8. Therefore, a firing signal is applied to the thyristor 7, which becomes conductive. ■While the valve is rotating and a voltage is induced in the exhaust->no-ita coil, these operations are repeated, and the opening/opening continues to cause misfires, so the engine is reliably stopped.In this way, in the present invention, Since capacitor 9 discharges only one half of the exciter coil (no coil), the capacitance of this capacitor can be made much smaller than before.According to experiments, the capacitor 9 shown in Fig. 1 is used in this device. 1/1 of Ndensa
The idea was to use a capacitor with a capacity of 0.000 to ensure reliable operation. In this case, the capacitor's serrations could be reduced to about 1/300 of the conventional capacitor. ) In the above embodiment, the diode 20 is provided to protect the transistor 18 from the induced voltage in the direction opposite to the illustrated arrow of the exciter coil, and this diode 20 may be omitted if the reverse withstand voltage of the transistor is sufficient. I can do it. Furthermore, the resistor 15 is provided to prevent the firing signal from being given to the switch 11 when the contacts of the switch 11 are immersed in water.The resistance value of this resistor 15 is J3 is set to a sufficiently low value for the small resistance between the contacts of switch 11 so that the voltage appearing across resistor 15 does not reach the trigger level of resistor 7 when switch 11 is immersed in water. .

FIG. 3 shows another embodiment of the present invention, in which the anode of the diode 10 is connected to the cathode of the diode 20 via a resistor 23. The collector of an NPN transistor 24 whose emitter is grounded is connected to the connection point between the resistor 23 and the diode 10.
The base of transistor 24 is connected to the cathode of diode 20 via resistor 25. A stop command switch 11 is connected in parallel between the base of the transistor 24 and ground, so that when the switch is closed, the base and emitter of the transistor 11 are short-circuited.

In the embodiment shown in FIG. 3, when the stop command switch 11 is open, a base current flows to the transistor 9 through the diode 20 and the resistor 25 when a voltage with the polarity in the direction of the arrow shown in the figure is generated in the exciting coil 6. is given, and the 1-transistor is conductive. Therefore, the current fl flowing from the exciting coil through the diode 20 and the resistor 23 flows through the transistor 24, charging the capacitor 9 and firing the thyristor 7.
Salary 1 will not be carried out. Therefore → Noirista 7 is 'IJ'h
...and the engine ignites without any problem. When the stop command switch is closed, the transistor 24 is cut off, so that the tie J-de 20,
Capacitor 1) 9 through resistor 23 and diode 10
is charged, and at the same time an ignition signal is given to the thyristor 7 through the transistor 16.

Therefore, the thyristor 7 becomes conductive and prevents the ignition operation of the engine. The operation after the thyristor 7 becomes conductive until the engine stops is the same as in the previous embodiment. With this configuration, one end of the stop command switch 11 can be grounded, so the configuration of the switch can be simplified.

FIG. 4 shows a further embodiment of the invention in which the diode 10 of FIG. 3 is replaced by a thyrisk 26. The anode of the thyrisk 26 is connected to the non-grounded terminal of the exciter coil 6, and the cathode is connected to the non-grounded terminal of the capacitor 9.

The gate I- of the thyristor 26 is connected to the connection point between the resistor 23 and the collector of the transistor 24, and when the stop command switch 11 is closed, the transistor 24 is connected to the disconnection point f of the transistor 1b.
An ignition signal is given to the thyrisk 26 only when the time is at i, so that charging of the condenser to No. 9 and supply of an ignition signal to the 1 Noirister 7 are performed.

With this configuration, since the capacitor 9 is initially charged through the cyrisk 26 when the switch is closed, the charging time constant at the time of initial charging of the capacitor can be made smaller than in the case shown in FIG. . Follow t switch 11
(It is possible to reliably charge the capacitor 9 even when the battery is closed, and the operation of the stop device can be reliably determined.)
can.

In the above embodiments, a condenser discharge type ignition device is used, but the present invention can be similarly applied to cases where other types of ignition devices are used. For example, as shown in FIG. 5, a switch 30 such as a transistor is connected in parallel to the primary coil (which also serves as an exciter coil) of an ignition coil (which also serves as an exciter coil) disposed in a magnet generator driven by the engine. A well-known PJi type ignition device is used in which ignition is performed by switching the C switch 30 from a conductive state to a 15-off state when the voltage induced in the coil 1a reaches a half-noise in the direction of the arrow shown in the figure. The present invention can also be applied to such cases.

Further, as shown in FIG. 6, a collector-emitter circuit of a transistor 321 is connected in parallel to both ends of the exciter coil 6 via a diode 31, and a thyristor 33 is connected in series to the primary coil 1a. The present invention can also be applied when a known ignition device is used in which the base of thyristor 32 and the anode of thyristor 33 are coupled via diode 34. In this ignition device, spark plugs 2 and 2' are connected between both ends of the secondary coil of the ignition coil and the ground, respectively, and these spark plugs are connected to two cylinders in which there is no problem even if sparks are generated at the same time, e.g. The ignition system shown in Fig. 6 is connected to two cylinders such that when one is at the ignition timing, the other is in the exhaust culm. A base current is applied to the transistors 1 to 32 through the primary coil 1a and the diode 34, and the transistors 1 to 32 conduct.Next, when a firing signal is applied to the thyristor 33 from a signal coil (not shown), the iris conducts accordingly. Then, the 1-run risk 32 is cut off. Therefore, the current flowing from the exciter coil 6 through the diode 31 and the transistor 32 is cut off, and a high voltage is induced in the exciter coil 6. This high voltage is Since the voltage is further increased and applied to the spark plug 2.2'', sparks are generated at both spark plugs at the same time.

In the above embodiment, the resistor 8 is used as the current limiting element, but a semiconductor element such as a diode with the cathode facing the gate of the thyristor 7 can be used as the current limiting element.

In the above embodiment, the stop command switch 11 may be a self-resetting switch (for example, a push button switch) that is closed by manual operation. : + It could be a detection switch that closes when the Ozeki's A-Ile falls below the specified meter.

Effects of the Invention As described above, according to the present invention, a discharge control switch circuit is inserted between the first stop capacitor and the current limiting element, and the discharge control switch circuit is inserted between the first stop capacitor and the current limiting element, so that The switch circuit is made conductive to prevent the capacitor from being struck by lightning W[
Since the capacity of the engine stop capacitor can be made much smaller than before, the capacity of the capacitor 4)
It has the advantage that it can be small and inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing a conventional example, Fig. 3 is a circuit diagram showing an embodiment of the present invention, and Fig. 4 shows changes in terminal voltage of a condenser for near-dead stop with the conventional device and the present invention. FIG. 5 J3 and FIG. 6 are circuit diagrams showing other different embodiments of the present invention. 1... Ignition coil, 2... Spark plug, 3... Ignition energy storage capacitor, 4... Reilly risk,
6... Exciter coil (ignition power supply coil), 7...
・Iristor for interlocking stop, 8...Resistor (current limiting element), 9...Capacitor for separate stop, 10...Diode, 11...Switch for stop command, 12...Machine ll11 stop device, 16.18...1 ~ transistor,
17.19...Resistor, 22...Diode. Procedural amendment (method) October 3, 1980 Kazuo Wakasugi, Commissioner of the Patent Office 1. Indication of the case 11151'6% 2. Name of the invention Internal combustion engine [Liu stop device (134) Kokusan Denki Co., Ltd. 4, Agent 6th floor, Bunzan Building, 4-31-6 Shinkyo, Minato-ku, Tokyo 105 September 27, 1981 Packed with a brief explanation of the drawings of the specification subject to the 6° amendment. 7. Contents of correction

Claims (1)

[Claims] An engine stop device connected in parallel to a power supply coil of an internal combustion engine ignition device in such a direction that a forward voltage is applied between the anode and cathode at the output of one half cycle that contributes to the ignition operation of the power supply coil of the ignition device for an internal combustion engine. a thyristor, an engine stop capacitor connected through a current limiting element between the gate cathode of the thyristor and charged by a voltage drop across the gate cathode of the thyristor, and a stop command capacitor that is closed when the internal combustion engine is stopped. In an internal combustion engine stop device that includes a switch and an initial charging circuit that charges the capacitor from the power supply coil side when the stop command switch is opened, the internal combustion engine stop device is configured such that the engine stops only during the period from the one half of the exhaust coil to the noise coil. A discharge control switch is inserted between the capacitor and the current limiting element, and is electrically conductive to allow the capacitor to discharge between the current limiting element and the gate cathode of the thyristor. An internal combustion engine stopping device characterized in that a diode with an anode facing the t] is connected in parallel to the discharge control switch.