JPH0517431Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an alarm device that issues an alarm when engine oil is insufficient, and in particular uses an ignition device that has a self-trigger type ignition circuit as an ignition circuit. Regarding improvements to alarm devices.

(Prior Art) In general, if an engine continues to be operated with an insufficient amount of engine oil or radiator cooling water, it may cause engine trouble. Also,
When the amount of brake oil decreases, the brakes become harder to apply. For this reason, it has conventionally been possible to detect the operational status of these various parts and, for example, when the level of engine oil decreases, the engine's ignition signal is grounded to automatically stop the engine or generate an alarm. It is often configured to do so.

As this type of prior art, for example,
There is one disclosed in No. 56271. According to this,
Out of the primary voltage of the ignition coil of the self-trigger type ignition device, extract the voltage of the polarity on the side that does not contribute to ignition,
This voltage is used to drive the alarm means.

(Problems to be Solved by the Invention) By the way, when a piezoelectric buzzer is provided in this type of alarm device, a configuration for applying a stable voltage to the piezoelectric buzzer is required.

In view of these circumstances, an object of the present invention is to provide a simple-configuration alarm device that utilizes a self-trigger type ignition device as a power source and takes advantage of the characteristics of a piezoelectric buzzer.

(Means for Solving the Problem) In order to achieve this object, according to the present invention, an induced voltage is induced in the primary side 12a of the ignition coil 12 using the rotor 10 rotating in synchronization with the engine as a field. The engine ignition circuit 1 includes an engine ignition circuit 1 that induces an ignition voltage on the secondary side 12b of the ignition coil 12 by controlling on/off the current flowing through the coil on the primary side 12a based on changes in the induced voltage, and a smoothing capacitor 21. 1 of the ignition coils 12
A rectifier circuit 2 that extracts a polarity voltage that does not contribute to ignition among the induced voltages induced in the next side 12a, a piezoelectric buzzer 3 as an alarm means driven by the output of the rectifier circuit 2, and a switch that detects a state that should be alarmed. A circuit in which the piezoelectric buzzer 3 and the oil level detection switch 4 are connected in series is connected in parallel to the capacitor 21 of the rectifier circuit 2.

According to such a configuration, it is possible to stably apply voltage to the voltage driving means by using the voltage on the side that does not contribute to ignition of the self-trigger type ignition device,
Moreover, a large current does not flow through the switch means for detecting the operating state.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a system diagram of an engine warning device according to an embodiment of the present invention. According to the figure, this engine alarm device includes a self-trigger type ignition circuit 1, a rectifier circuit 2, a piezoelectric buzzer 3 as an alarm means, and a float type oil level detection switch 4 as a switch means. .

The self-trigger type ignition circuit 1 includes a permanent magnet 11 fixed around a rotor 10 that rotates in synchronization with the engine, and an ignition coil 12 using the rotor 10 as a field.
An ignition voltage is induced on the secondary side 12b of the ignition coil 12 by inducing an induced voltage on the primary side 12a of the ignition coil 12 and controlling on/off the current flowing through the coil on the primary side 12a based on changes in the induced voltage. . Such on/off control is performed by transistor 1
This is done by a rectifier circuit equipped with 3 and 14. That is, when the rotor 10 rotates as the engine rotates, one of the ignition coils 12 uses the rotor 10 as a field.
An alternating voltage is induced on the next side 12a. This voltage is first applied to the base of transistor 13 via resistors 15 and 16. Therefore, the transistor 13 is turned on, and an induced current flows back through the coil of the primary side 12a via the transistor 13. At this time, transistor 14 is still in the off state. However, since the induced voltage generated in the coil on the primary side 12a is simultaneously applied to the voltage dividing circuit made up of resistors 17 and 18, the voltage at contact a of this circuit gradually increases. This increased voltage is applied to the base of the transistor 14 via the voltage stabilizing capacitor 19, and therefore, when this voltage exceeds a certain value, the transistor 14 is turned on. When transistor 14 turns on, transistor 1
Since the base voltage of transistor 3 drops to ground potential, transistor 13 quickly turns off. Therefore, the current flowing through the primary side 12a of the ignition coil 12 is abruptly interrupted, generating a high voltage on the secondary side 12b, and igniting the spark plug G connected to the secondary side 12b. At this time, a voltage as shown in FIG. 2 is generated on the primary side 12a of the ignition coil 12 by one rotation of the rotor 10.

A rectifier circuit 2 is connected to the coil on the primary side 12a of the ignition circuit 1 as described above. This rectifier circuit 2 is
Rectifier diode 20 and smoothing capacitor 2
1, and extracts a polar voltage (+ side in FIG. 2) that does not contribute to ignition out of the induced voltage on the primary side 12a of the ignition coil 12.
A piezoelectric buzzer 3 serving as an alarm and a detection switch 4 for detecting a decrease in engine oil are connected in series to the output end of the rectifier circuit 2. That is, a series circuit of the piezoelectric buzzer 3 and the detection switch 4 is connected in parallel to the capacitor 21 of the rectifier circuit 2. Here, piezoelectric buzzer 3
The device has a diaphragm made of a piezoelectric element and generates vibrations by applying a predetermined voltage, and almost no current flows therethrough. The engine oil level detection switch 4 is constructed by fixing a reed switch 41 at a predetermined position in the oil pan and surrounding the reed switch 41 with a float 42 equipped with a magnet 43. While there is sufficient oil, the float 42 is at a higher position than the reed switch 41 and the contact of the switch 41 is open, but when the oil falls below a certain level, the float 42 is located at the reed switch 41. Therefore, the contacts of the reed switch 41 are closed, and the piezoelectric buzzer 3 is connected to the ignition coil 1 through the rectifier circuit 2.
Among the induced voltages on the primary side 12a of 2, a polar voltage (+ side in FIG. 2) that does not contribute to ignition is applied.
At this time, most of the applied voltage is applied to the piezoelectric buzzer 3, but since almost no current flows through the piezoelectric buzzer 3 itself and the smoothing capacitor 21 is connected in parallel, a stable voltage is maintained. can be applied.

Moreover, level detection switch 4 and piezoelectric buzzer 3
Because they are connected in series, almost no current flows through the contacts, and no large surge current flows when they are turned on. Therefore, the level detection switch 4 may have a small capacity contact. By the way, in order to stabilize the voltage applied to the piezoelectric buzzer 3, it is possible to connect the smoothing capacitor 21 in parallel to both ends of the piezoelectric buzzer 3, but in this case, the smoothing capacitor 21 and the level detection switch 4 are connected in series. In addition, a large surge current flows directly through the contacts when they are turned on, so the contact capacity must be increased. On the other hand, according to the present invention, as described above, the piezoelectric buzzer 3 can prevent the large surge current from flowing, so the capacity of the contact can be reduced.

(Effects of the invention) As explained above, the alarm device using the ignition device according to the invention has the following effects.

An alarm device can be obtained with a simple configuration in which a self-trigger ignition circuit is used as a power source, a switch for detecting a state to be alarmed and a piezoelectric buzzer are connected in series, and a smoothing capacitor is connected in parallel with these.

The piezoelectric buzzer is activated by the polarity voltage that does not contribute to ignition among the induced voltage on the primary side of the ignition coil, but in this case, since a smoothing capacitor is connected in parallel, a stable voltage can be supplied to the piezoelectric buzzer. can.

Since the detection switch for the alarm condition and the piezoelectric buzzer are connected in series, almost no current flows through the contacts, making it possible to reduce the capacity of the detection switch.

The present invention is not limited to the above embodiments and modifications, and various other embodiments and modifications are possible within the technical scope of the present invention, and equivalent components may be used. It will be clear to those skilled in the art that interchanges are possible. For example, the detection of the operating state is not limited to engine oil level detection, but the present invention can be applied to various detections such as radiator cooling water and brake oil.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an alarm device using an ignition device according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the operation of main parts of the embodiment of the present invention. In the drawings, 1 is a self-triggered ignition circuit; 2 is a self-triggered ignition circuit;
3 is a rectifier circuit, 3 is a piezoelectric buzzer, 4 is an oil level detection switch, 10 is a rotor, 11 is a rotor field, 12 is an ignition coil, and 21 is a capacitor.

Claims (1)

[Claims for Utility Model Registration] (1) An induced voltage is induced in the primary side of the ignition coil using a rotor that rotates in synchronization with the engine as a field, and based on the change in this induced voltage, the coil on the primary side is an engine ignition circuit that induces an ignition voltage on the secondary side of the ignition coil by on/off control of a flowing current, and a smoothing capacitor that does not contribute to ignition out of the induced voltage induced on the primary side of the ignition coil; A rectifier circuit that takes out a polar voltage, a piezoelectric buzzer as an alarm means driven by the output of the rectifier circuit, and a switch means for detecting a state to be alarmed, and the piezoelectric buzzer and the switch means are connected in series. An alarm device using an ignition device, characterized in that a circuit is connected in parallel to a capacitor of the rectifier circuit. (2) The alarm device using an ignition device according to claim 1, wherein the switch means is a level detection switch that detects the level of lubricating oil in the engine. (3) Utility Model Registration An alarm device using an ignition device according to claim 1 or 2, wherein the switch means detects the level of lubricating oil in the engine.