JPH034785Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal combustion engine ignition device, and particularly to an instruction device for a rotation speed control operation that prevents the rotation speed of an internal combustion engine from rising above a predetermined rotation speed.

If the rotational speed control circuit controls the induced voltage of the generator coil when the internal combustion engine rotational speed reaches a predetermined value, the internal combustion engine rotational speed will not rise above the predetermined rotational speed even in the event of an abnormality. It is possible to prevent breakdowns, damage, etc. when the speed of the engine becomes higher than necessary. Since such an abnormal state is not desirable, it is necessary to quickly restore the normal operating state, and for this purpose, it is necessary to promptly notify the driver that the control operation is being performed.

This invention was made in view of the above-mentioned circumstances, and the purpose of this invention is to provide a means for detecting an abnormal state related to the rotational speed of an internal combustion engine and instructing that a control operation is being performed; By providing means for shunting the current flowing through the indicating means when the voltage applied to the indicating (displaying) means reaches a predetermined value, there is no need for a special power supply or circuit to indicate the control operating state. Even if the set rotation speed of the rotation speed control circuit that performs control operations is set over a wide range from low speed values to high speed values, the control operation status can be easily determined.
Another object of the present invention is to provide a highly reliable, simple, and inexpensive internal combustion engine ignition device that can prevent damage to the indicating means due to overvoltage.

This invention will be explained in detail below based on the embodiment shown in the drawings.

In the figure, 1 is a generator coil of a generator (for example, a magnet generator) driven by the engine, and 2 is a signal coil that generates an ignition signal in response to the ignition timing of the engine, which is attached to the above-mentioned magnet generator. It generates an AC output signal that is synchronized with the rotation of the engine. 3 is an ignition circuit, such as a capacitor charging/discharging type or a current interrupting type using a transistor, which is connected to the output terminal of the generating coil 1;
4 is an ignition coil that receives the ignition output of the ignition circuit 3 on its primary side and generates high voltage on its secondary side; is ignition coil 4-2
An ignition plug that discharges a spark in response to a voltage on the next side; 6 a frequency-voltage converter that receives an ignition signal from the signal coil 2 and generates a voltage output according to the rotational speed of the internal combustion engine; 7 a frequency-voltage converter 6; This is a switch circuit that works to short-circuit the output signal generated at the output terminal of the generator coil 1 in response to the voltage output of the generator coil 1, thereby disabling the ignition circuit 3. The switch circuit consists of a switching element such as a thyristor, and rotates together with the frequency-voltage converter 6. This constitutes a numerical control circuit. Reference numeral 8 denotes an indicator lamp as an indicating means connected between the output terminal of the generator coil 1 and the switch circuit 7, and the induced voltage of the generator coil 1 is released to the ground by the switch circuit 7 via the indicator lamp 8. At this time, the indicator lamp lights up to indicate that the rotation speed control circuit is operating. 9 is a switching element (for example, a thyristor) provided to shunt the overcurrent of the indicator lamp 8; 10 is connected between the gate and anode of the switching element 9, and the voltage applied to the indicator lamp 8 is set to a predetermined value; A constant voltage diode is turned on to provide a trigger current to the switching element 9 when the voltage reaches a certain value, and 11 is a power supply circuit that supplies power to the frequency-voltage converter 6.

Next, the operation will be explained. Each output of the generator coil 1 and the signal coil 2 is supplied to an input terminal of an ignition circuit 3 in accordance with the rotation of the internal combustion engine. As described above, the ignition circuit 3 receives the output signal of the signal coil 2 at a predetermined ignition timing using the induced voltage of the generator coil 1 as an energy source for the ignition spark, and supplies energy to the ignition coil 4. A high voltage is generated on the secondary side of the receiver, and an ignition spark is generated at the ignition plug 5. On the other hand, the ignition signal of the signal coil 2 is also supplied to a frequency-voltage converter 6, and the frequency-voltage converter 6 generates an output proportional to the ignition signal of the signal coil 2, that is, the rotational input signal. Also,
Since the frequency of this rotation input signal is proportional to the rotation speed of the internal combustion engine, the voltage output of the frequency-voltage converter 6 is proportional to the rotation speed of the internal combustion engine.

The switch circuit 7 receives the voltage output from the frequency-voltage converter 6, and is made up of a transistor, thyristor, etc., which becomes conductive when the output reaches a predetermined threshold. Of the AC output, the positive voltage is released to the ground. Therefore, when the rotational speed of the internal combustion engine increases and the output of the frequency-voltage converter 6 reaches a predetermined threshold, the switch circuit 7 becomes conductive and the positive voltage output of the generator coil 1 returns to the ground potential via the indicator lamp 8. , the ignition circuit 3 is disabled and the ignition spark of the ignition plug 5 is extinguished. As a result, the rotational speed of the internal combustion engine decreases and the voltage output of the frequency-voltage converter 6 becomes lower than a predetermined threshold, so the switch circuit 7 becomes non-conductive and the output of the generator coil 1 is again given to the ignition circuit 3. An ignition spark is generated at the ignition plug 5, thereby making it possible to maintain the rotational speed of the internal combustion engine at approximately a predetermined value.

Here, when the switch circuit 7 becomes conductive, a current of several hundred milliamperes flows to the indicator lamp 8 when the ignition circuit 3 uses a capacitor charge/discharge type ignition system, and several amperes when the ignition circuit 3 uses a transistor ignition system, resulting in a current of several watts to more than ten watts. Can light up a lamp.

The indicator lamp 8 actually repeats blinking due to the positive voltage output of the generating coil 1, but since the frequency of the output of the generating coil 1 is high, visually it appears to be continuously lit. This allows the driver to be informed that the rotational speed control circuit is in operation, that is, that a control operation is being executed. In addition, it is preferable to use a lamp that matches the voltage generated by the generator coil 1 at the set rotation speed of the rotation speed control circuit and the rated power of the indicator lamp 8 so that the driver can easily determine when the control operation is being performed. . Further, the constant voltage diode 10 is set to a threshold value slightly higher than the peak value of the voltage when the indicator lamp 8 is lit at the rated voltage. Even if the rotation speed control circuit operates, the internal combustion engine has inertia, so the rotation speed may rise above the rotation speed setting of the rotation speed control circuit. In some cases, the rotation speed may be set even higher.
In these cases, the voltage applied to the indicator lamp 8 increases as the rotation speed increases, and the voltage applied to the voltage regulator diode 1 increases.
Since the predetermined threshold value of 0 is exceeded, the constant voltage diode 10 becomes conductive, triggering the switching element 9 to become conductive, short-circuiting both ends of the indicator lamp 8, and shunting the excess current. As a result, no overcurrent flows through the indicator lamp 8, and a current within the rated range from the zero voltage output of the generator coil 1 to the voltage at which the constant voltage diode 10 conducts flows.
It is possible to prevent the indicator lamp 8 from being damaged or having a shortened lifespan. When the voltage applied to the indicator lamp 8 is below the predetermined threshold value of the voltage regulator diode 10, the voltage regulator diode 10 is not conductive, so the switching element 9 is also non-conductive, and the current flowing through the indicator lamp 8 is divided. Not routed. Therefore, the indicator lamp 8 is kept at a substantially constant brightness that makes it easy to always determine when the rotational speed control circuit is operating.

As described above, according to the present invention, there is provided an indicating means for indicating that the rotation speed control circuit is operating due to the induced voltage of the generator coil when the internal combustion engine is abnormally rotating, and the When the voltage reaches a predetermined value, the simple structure of simply adding a means to shunt the current flowing to the indicating means can sufficiently achieve the purpose of notifying the driver of the abnormal state of the internal combustion engine. It protects against overvoltage (overcurrent), prevents damage, and extends its life.Also, even if the set rotation speed of the rotation speed control circuit is made variable, the voltage applied to the indicating means is always kept almost constant, and the indication is maintained. This has the great effect of making it easier to identify the means, and furthermore, since the indicating means is operated by the induced voltage of the disabled generating coil, there is no need to provide another power supply circuit, and the device can be configured easily.

Although a lamp was used as the indicating means in the above embodiment, the same effect can be expected by using a light emitting element such as a light emitting diode, a buzzer, a meter, etc. instead, and the above embodiment also uses a lamp as the indicating means. Although a switching element and a constant voltage diode are used as a means for shunting the current flowing through the circuit, similar effects can be expected with other switching elements or circuits such as a side cap that becomes conductive when a predetermined voltage is reached.

[Brief explanation of the drawing]

The figure is an electrical circuit diagram showing an embodiment of the internal combustion engine point device according to the invention. In the figure, 1 is a power generation coil, 2 is a signal coil, 3 is an ignition circuit, 6 is a frequency-voltage converter, and 7
8 is a switch circuit, 8 is a display lamp, 9 is a switching element, 10 is a constant voltage diode, and 11 is a power supply circuit.

Claims (1)

[Claims for Utility Model Registration] (1) An ignition circuit that is connected to the output terminal of a generator coil and generates an ignition output using its induced voltage as an ignition source, and an ignition circuit that generates an ignition signal in synchronization with the rotation of an internal combustion engine. , this ignition signal activates the ignition circuit, a signal coil receives the ignition signal of this signal coil, generates a voltage output according to the rotation speed of the internal combustion engine, and when this voltage output reaches a predetermined value, the a rotational speed control circuit that disables the ignition circuit to reduce the rotational speed of the internal combustion engine; and a rotational speed control circuit that is connected between the rotational speed control circuit and the output terminal of the generator coil, and the rotational speed control circuit controls the ignition circuit. an indicating means for instructing that the rotation speed control circuit is operating in response to the induced voltage when disabled; and a current flowing through the indicating means when the voltage applied to the indicating means reaches a predetermined value. an internal combustion engine ignition device, comprising: shunt means for shunting the voltage to keep the voltage applied to the indicating means substantially constant. (2) The internal combustion engine ignition device according to claim (1) of the utility model registration, wherein the indicating means is a lamp. (3) The internal combustion engine ignition device according to claim (1) of the utility model registration, wherein the indicating means is a light emitting diode. (4) The internal combustion engine ignition system according to claim (1) of the utility model registration, wherein the indicating means is a buzzer. (5) The internal combustion engine ignition system according to claim (1) of the utility model registration, wherein the indicating means is a meter. (6) A utility model registration request in which the rotation speed control circuit includes a frequency-voltage converter connected to a signal coil and a switch circuit connected between the frequency-voltage converter and indicating means. Range of (1)
Internal combustion engine ignition system as described in . (7) Utility model registration claim 1, wherein the shunt means comprises a switching element connected to both ends of the indicating means, and a constant voltage diode connected between the anode and gate of the switching element. The internal combustion engine ignition system described in paragraph (1). (8) The internal combustion engine ignition system according to claim (7), wherein the switching element is a thyristor. (9) The internal combustion engine ignition system according to claim (1), wherein the shunt means is a side switch connected to both ends of the indicating means.