JPH0536975Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an oil warning device for an internal combustion engine, and in particular detects a decrease in oil discharge amount due to clogging of a filter element and issues a warning. The present invention relates to an oil warning device for an internal combustion engine that can reliably notify a driver of the occurrence of an abnormal condition beforehand and prevent engine damage by regulating the engine speed to a set value.

[Background Art] In an internal combustion engine, oil is supplied to each part of the engine in order to lubricate the moving parts of each part of the engine and reduce frictional resistance. The oil stored in the oil tank, which is the oil storage section, is filtered to remove foreign matter by the filter element of the oil cleaner installed between the oil tank and the oil pump, and is sucked by the oil pump and supplied to the moving parts of each part of the engine. Provides lubrication.

[Problems to be Solved by the Invention] However, as a result of filtration, foreign matter gradually accumulates in the filter element, causing clogging, which in turn causes the engine to overheat and cause damage due to a decrease in the amount of oil discharged. For this reason, it is necessary to regularly clean or replace the filter element, but maintenance and inspection are complicated and it is possible to forget to clean or replace the filter element, resulting in damage to the engine. .

Therefore, Utility Model Application No. 58-124609 and Utility Model Application No. 59-
A device as disclosed in Japanese Patent No. 27112 was proposed. However, in the former case, when the filter element becomes clogged, the filter element slides to form an opening that directly sucks oil, so foreign matter is directly supplied to the moving parts, causing damage to the engine and causing the driver to experience abnormalities. The occurrence of the condition cannot be known in advance. In addition, the latter system detects the oil level in the crank chamber and issues a warning, but it cannot detect a decrease in the amount of oil discharged to moving parts due to a clogged filter element, which may cause the engine to overheat. There is an inconvenience that may cause damage.

[Purpose of the invention] Therefore, the purpose of this invention is to detect a decrease in the amount of oil due to filter element clogging in advance, generate a trend, and regulate the engine speed to a set value, thereby making it easier for the driver to An object of the present invention is to realize an oil warning device for an internal combustion engine that can reliably notify the occurrence of an abnormal state in advance and prevent damage to the engine.

[Means for solving the problem] In order to achieve this objective, this invention provides an oil cleaner in the middle of the oil passage that communicates the oil reservoir of the internal combustion engine with the oil pump, and also provides an oil cleaner inside the body of the oil cleaner. A filter element for filtering foreign matter is provided in the middle of the oil passage, and the oil passage inside the main body on the downstream side of the filter element is provided with a filter element that prevents the oil discharge amount from increasing before the oil discharge amount of the oil pump becomes less than a specified amount due to clogging. A pressure switch is provided to detect negative pressure, which is the suction pressure, and a warning circuit is activated and issues a warning based on a detection signal of the negative pressure, which is the suction pressure, from the pressure switch, and a rotation speed regulation circuit is used to regulate the engine speed to a set value. It is characterized by having the following.

[Operation] According to the configuration of this invention, when the filter element becomes clogged, the negative pressure that is the suction pressure of the oil passage inside the filter element on the downstream side increases due to the suction of the oil pump. A warning circuit and a rotation speed regulation circuit are activated by a detection signal from a pressure switch that detects negative pressure, which is the increased suction pressure before the oil pump's oil discharge amount drops below the specified amount due to this clogging. and regulates the engine speed to the set value. As a result, a decrease in oil discharge amount due to filter element clogging can be detected in advance by changes in negative pressure, which is suction pressure, and the driver can be reliably notified of the occurrence of an abnormal condition, as well as damage to the engine. can be avoided. Further, since detection is performed using negative pressure, a decrease in the oil discharge amount can be detected without being affected by the discharge pressure (positive pressure) of the oil pump. Furthermore, by providing the filter element and the pressure switch inside the main body of the oil cleaner and configuring them as one body, it is possible to perform a continuity test on the pressure switch at the same time as cleaning the filter element.

[Example] Next, an example of this invention will be described in detail based on the drawings. 1 to 6 show examples of this invention.

In Fig. 1, 2 is oil, 4 is an internal combustion engine,
6 is an oil tank serving as an oil storage section, 8 is an oil pump, and 10 is an oil cleaner. The oil passage 12 that communicates the oil tank 6 and the oil pump 8 includes a first oil passage 12-1 and a second oil passage 12-2. First oil passage 12-1
One end communicates with the oil tank 6, and the other end communicates with the oil cleaner 10. Further, one end of the second oil passage 12-2 communicates with the oil cleaner 10,
The other end communicates with the oil pump 8. This results in
An oil cleaner 10 is provided in the middle of an oil passage 12 that communicates an oil tank 6 and an oil pump 8. The oil 2 stored in the oil tank 6 is transferred to an oil cleaner 10 by an oil pump 8.
Foreign matter is filtered and sucked by the filter element 18, and is supplied to the moving parts of the internal combustion engine 4 through the oil supply passage 14 for lubrication.

The oil cleaner 10 is constructed as shown in FIGS. 2 and 3. Main body 16 of oil cleaner 10
is an upper body 16-1, an intermediate body 16-2, and a lower body 1.
6-3, which are integrally formed with a space inside. The upper body 16-1 has a first passage 12-
1 is in communication with the intermediate body 16-2, and a second passage 1 is connected to the intermediate body 16-2.
2-2 are communicating. A filter element 18 for filtering foreign matter is interposed between the upper body 16-1 and the intermediate body 16-2, and is provided in the middle of the oil passage 12. On the downstream side of this filter element 18, that is, on the second passage 12-2 side, there is a diaphragm 2.
0, and a pressure sensing chamber 22 communicating with the second passage 12-2 is defined between the filter element 18 and one side of the diaphragm 20. This pressure detection chamber 22 is provided with a spring 26 that presses the diaphragm 20 in a direction that reduces the chamber 24 on the other side of the diaphragm 20.

A pressure switch 28 is provided in the chamber 24 on the other side of the diaphragm 20. Pressure switch 28
are two fixed contacts 30, 30 provided on the main body 16.
and a movable contact 32 provided on the diaphragm 20. When the clogging rate of the filter element 18 increases as shown in FIG. 5 and the negative pressure, which is the suction pressure of the oil pump 8 in the pressure detection chamber 22, increases, the discharge amount of the oil 2 increases to a certain constant value as shown in FIG. 4. It gradually decreases in proportion to the negative pressure above. Therefore, the pressure switch 28 is operated with the negative pressure, which is the suction pressure before the discharge amount becomes less than the specified amount, as a warning range. In other words, when the suction pressure is lower than the warning range where the oil discharge amount is maintained at the specified amount, the contacts 30 and 32 come into contact as shown in Fig. 2, and the warning area is reached before the oil discharge amount falls below the specified amount. The strength of the spring 26 is set so that the contacts 30 and 32 are separated from each other as shown in FIG. 3 when the suction pressure becomes negative. As a result, the pressure switch 28 is turned on when the suction pressure is lower than the warning range in which the discharge amount of the oil 2 is maintained at the specified amount, and the pressure switch 28 is turned on when the suction pressure is lower than the warning range where the discharge amount of the oil 2 is maintained at the specified amount. It turns off when it reaches negative pressure, which is the increased suction pressure.

FIG. 6 is a circuit diagram of the oil warning device.

In the figure, 34 is a magneto type CDI type ignition circuit, 36 is a rotation speed regulation circuit, and 38 is a warning circuit.

The CDI ignition circuit 34 rectifies an output generated in a capacitor charging coil 40 by a magnet rotor rotating in synchronization with a crankshaft (not shown) using a diode 42 to charge a capacitor 44. Further, the gate voltage generated in the pulser coil 46 is passed through the diode 48 to the thyristor 5.
When applied to the gate of 0, the charge in the capacitor 44 is discharged and a current flows through the ignition coil 52.
Each spark plug 54 generates a spark. Note that the power supply unit operates a rotation speed regulation circuit 36, which will be described later, using the output of the capacitor charging coil 40.

Next, the rotation speed regulation circuit 36 will be explained.

The rotation speed regulation circuit 36 includes a thyristor 56, a rotation speed detection circuit 58 that turns on and off the thyristor 56, a rotation speed switching circuit 60, and a light emitting diode 62 that displays the regulation state. This rotation speed regulation circuit 36 turns on the thyristor 56 when the pressure switch 28 is turned off due to negative pressure, which is increased suction pressure, before the oil discharge amount becomes less than a specified amount, and regulates the rotation speed to a set value. In Although,
In internal combustion engines, especially outboard engines, if the propeller and hull are not matched, or if the propeller is damaged during use, the engine speed may increase abnormally, damaging the engine or significantly shortening its life. be. Therefore, when over-speeding occurs, the rotation speed is regulated to the first setting value, which is the maximum rotation speed, and when the oil discharge amount becomes negative pressure, which is the increased suction pressure before the oil discharge amount becomes less than the specified amount, the first setting value is set. The rotation speed is regulated by switching to the second set rotation speed, which is a second set value lower than the rotation speed. That is, the anode of the thyristor 56 is connected to the capacitor charging coil 40 provided in the ignition circuit 34, while the cathode is connected to the resistor 64.
It is grounded through. The output end of a rotation speed detection circuit 58 is connected to the gate of this thyristor 56. The rotation speed detection circuit 58 inputs the output of the capacitor charging coil 40, and energizes the gate of the thyristor 56 when the engine rotation speed reaches a first set rotation speed. With this energization, the thyristor 56 short-circuits the capacitor charging coil 40 of the ignition circuit 34, so the spark plug 54 does not generate sparks and the engine speed is regulated to less than the first set speed. In addition, the pressure switch 2 detects the negative pressure that is the increased suction pressure before the oil discharge amount becomes less than the specified amount.
8 is turned off, the rotation speed switching circuit 60 switches to the second set rotation speed that is lower than the first set rotation speed, so the engine speed is regulated to be less than the second set rotation speed.

Further, when the engine speed is regulated below the first and second set speeds, a light emitting diode 62 connected to the cathode of the thyristor 56 via a resistor 66 lights up to display the regulated state.

The warning circuit 38 connects the pressure switch 28 to the battery 68 via an ignition switch 70, a resistor 72, and a diode 74. A capacitor 76 and a resistor 78 are connected in parallel with a diode 74 connected to this pressure switch 28, and this resistor 78 is further connected to the base of a transistor 80 and grounded via a resistor 82. The emitter of the transistor 80 is grounded, and a buzzer 84 and a light emitting diode 86 are connected in parallel between the collector and the ignition switch 70 via a resistor 85, and the collector is connected to the rotation speed switching circuit 60. .

At negative pressure, which is less than the warning range where the filter element 18 has a small clogging rate and the oil discharge amount is maintained at the specified amount, the pressure switch 28 is on, and the current flows through the battery 68, ignition switch 70, and resistor. 72, diode 74, pressure switch 28, and ground. Therefore, no current flows through the base of the transistor 80, and the transistor 80 is turned off. The pressure switch 28 is turned off when the filter element 18 becomes clogged and becomes negative pressure, which is the increased suction pressure in the warning range before the discharge amount becomes less than the specified amount. Therefore, the current flows from the battery 68 to the ignition switch 70 to the resistor 7.
2, the resistor 78, the base of the transistor 80, the emitter of the transistor 80, and ground, and the transistor 80 is turned on. When the transistor 80 is turned on, the transistor 80 is transmitted from the ignition switch 70 via the buzzer 84 and the light emitting diode 86.
Current flows through the collector, emitter, and ground, and a warning is issued by blowing and lighting. Further, the rotation speed switching circuit 60 is short-circuited by the transistor 80 and outputs an output to the rotation speed detection circuit 58 so as to switch from the first set rotation speed to the second set rotation speed.

Next, the action will be explained.

When the magnet rotor rotates in synchronization with a crankshaft (not shown), an electromotive force is generated in the capacitor charging coil 40 and the pulsar coil 46, and the CDI ignition circuit 34 drives the engine.

Then, current flows to the rotation speed detection circuit 58 by the output of the capacitor charging coil 40, and when the engine rotation speed reaches the first set rotation speed, the rotation speed detection circuit 58
8 applies a turn-on voltage to the thyristor 56, and the thyristor 56 is turned on. By turning on the thyristor 56, the capacitor charging coil 4
0, the SILSTAR 56, the resistor 64, and the ground are formed, and the output of the capacitor charging coil 40 becomes short-circuited, and the capacitor 44 is no longer charged. Therefore, no ignition power is supplied to the ignition coil 52, and sparks no longer fly. At this time, when current flows through the thyristor 56, the resistor 6
The voltage divided by voltages 4 and 66 is applied to the light emitting diode 62, and the light emitting diode 62 lights up.
This allows the driver to be notified by displaying that the rotation speed is being regulated.

Since the spark plug 52 no longer sparks, the engine speed decreases, but when the number of rotations falls below the first set number, no output is output from the rotation speed detection circuit 56 to the gate of the thyristor 56. As a result, the thyristor 56 is turned off, the sparks normally occur, and the engine speed increases. When the engine speed increases and reaches the first set speed again, the engine speed is regulated by the above operation. By repeating the above operations, the engine speed is kept almost constant.

Next, when the clogging rate of the filter element 18 of the oil cleaner 10 is small, the pressure detection chamber 22
Since the negative pressure, which is the suction pressure by the oil pump 8, is below the warning range in which the oil discharge amount is maintained at a specified amount, the pressure switch 28 is turned on as shown in FIG. Therefore, the buzzer 84 of the warning circuit 38 does not sound and the light emitting diode 86 does not emit light. Therefore, normal operation can be performed.

When the clogging rate of the filter element 18 increases, the negative pressure that is the suction pressure increases to the warning range before the discharge amount falls below the specified amount, and the pressure switch 2
8 is turned off as shown in FIG. Pressure switch 28
OFF, the transistor 80 of the warning circuit 38 is turned on, turning on the buzzer 84 and making it sound, and turning on the light emitting diode 80 and lighting it up. As a result, the driver is warned of a decrease in oil amount due to clogging, as shown in FIG. 4, before the oil amount decreases.

Furthermore, when the transistor 80 is turned on, the rotation speed switching circuit 60 switches the rotation speed of the second contact point to a rotation speed lower than the first set rotation speed.
Output to 8. For example, the first set rotation speed
6000rpm, the second set rotation speed is 300rpm, and the second
When switching to the set rotation speed, the internal combustion engine 4
When the engine is operating at a rotational speed of 6000rpm, the rotational speed detection circuit 58 activates the thyristor 5 as described above.
6 is turned on, the spark plug 54 does not generate a spark, and the engine speed is regulated to 3000 rpm. At this time, the light emitting diode 62 is simultaneously turned on to inform the driver that the rotation speed is being regulated.

Therefore, a decrease in the amount of oil discharged due to clogging can be detected in advance by a change in negative pressure, which is suction pressure, and a warning can be issued and the engine speed can be regulated. Therefore, by regulating the rotational speed in conjunction with a warning, it is possible to reliably notify the driver of the occurrence of an abnormal condition in advance, and it is possible to avoid engine damage.

In addition, by detecting a decrease in oil discharge amount due to clogging using changes in negative pressure, it is not affected by pressure fluctuations as is the case when detecting using the discharge pressure (positive pressure) of an oil pump, which fluctuates widely. Without,
It can be detected stably. Furthermore, since the filter element 18 and the pressure switch 28 are provided inside the main body 16 of the oil cleaner 10, the filter element 18 can be cleaned at the same time as the light emitting diodes 62, 8.
Although the display is exemplified by 0, it may also be displayed by a lamp or liquid crystal. In addition, the rotation speed switching circuit 60
Although the configuration is such that the rotational speed is regulated instantaneously when the transistor 80 is turned on, it is also possible to set a delay time to regulate the rotational speed.

[Effects of the invention] As described above, according to this invention, a decrease in the oil discharge amount due to clogging of the filter element can be detected in advance by a change in the negative pressure, which is the suction pressure of the oil pump, and a warning can be issued. The engine speed can be regulated to a set value. Therefore, by warning and speed regulation,
The driver can be reliably notified of the occurrence of an abnormal condition in advance, and engine damage can be avoided.

In addition, by detecting a decrease in oil discharge amount due to clogging using changes in negative pressure, it is not affected by pressure fluctuations as is the case when detecting using the discharge pressure (positive pressure) of an oil pump, which fluctuates widely. Without,
It can be detected stably. Furthermore, by providing the filter element and the pressure switch inside the main body of the oil cleaner, the continuity test of the pressure switch can be carried out at the same time as cleaning the filter element, thereby facilitating maintenance and inspection.

Furthermore, by providing a pressure switch between the oil reservoir and the oil pump, it can be used regardless of the number of cylinders in the internal combustion engine, providing great versatility, and the simple structure reduces costs. Of course, the filter element can be reused by cleaning it.

[Brief explanation of the drawing]

The figures show an embodiment of this invention. Figure 1 is a schematic diagram of the device, Figures 2 and 3 are sectional views of the oil cleaner showing the on/off states of the pressure switch, and Figure 4 is a negative pressure and discharge Figure 5 is a diagram showing the relationship between clogging rate and negative pressure, Figure 6 is a diagram showing the relationship between clogging rate and negative pressure.
The figure is a circuit diagram of the device. In the figure, 2 is oil, 4 is an internal combustion engine, 6 is an oil tank, 8 is an oil pump, 10 is an oil cleaner, 12-1 is a first oil passage, 12-2
is the second oil passage, 28 is the pressure switch, and 34 is the second oil passage.
A CDI type ignition circuit, 36 a rotation speed regulation circuit, 38 a warning circuit, 58 a rotation speed detection circuit, 60 a rotation speed switching circuit, 84 a buzzer, and 86 a light emitting diode.

Claims (1)

[Scope of utility model registration request] An oil cleaner is provided in the middle of the oil passage that communicates the oil reservoir of the internal combustion engine with the oil pump, and a filter element for filtering foreign matter is provided in the middle of the oil passage inside the main body of the oil cleaner, and the The oil passage inside the main body is provided with a pressure switch that detects negative pressure, which is the increased suction pressure, before the oil discharge amount of the oil pump becomes less than the specified amount due to clogging, and the suction from this pressure switch is An oil warning device for an internal combustion engine, comprising a warning circuit that activates and issues a warning in response to a detection signal of negative pressure, and a rotation speed regulation circuit that regulates the engine speed to a set value.