JPS59557Y2 - Engine lubricating oil pressure drop warning device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a lubricating oil pressure drop warning device for an engine.

Conventional engine lubricating oil pressure drop alarm systems have been designed to issue an alarm when a lubricating oil pressure switch detects that the lubricating oil pressure has fallen below a specified pressure. is set to a lower value than the lubricating oil pressure when idling, so even if some abnormality occurs in the lubricating oil system, the lubricating oil pressure will drop to the specified pressure when the engine speed is high. Rare.

Furthermore, even if it were to go down, it would take a lot of time, and there would be a delay in issuing a warning, which could lead to burnout of the bearing metal, etc.

This proposal addresses the above-mentioned problems, and includes an alarm, a pressure comparison device that compares the detected value of lubricating oil pressure with high and low level setting values of the same lubricating oil pressure, and a detected value of engine rotation speed. A rotation speed comparison device that compares the high and low level setting values of the engine rotation speed, and a rotation speed comparison device that compares the engine rotation speed with the high and low level setting values.
When the lubricating oil pressure is within the range of the low level set value and is below the low level setting value, or when the engine rotation speed is above the high level setting value and the lubricating oil pressure is below the high level setting value. The lubricating oil pressure drop warning device for an engine is characterized in that the lubricating oil pressure drop warning device for an engine is characterized by comprising: a control device that sends an activation signal to the alarm; When the hydraulic pressure decreases,
An object of the present invention is to provide an improved lubricating oil pressure drop alarm device that can promptly issue an alarm and prevent burnout accidents occurring in bearing metals, etc.

The lubricating oil pressure drop alarm system for the engine of this invention includes an alarm as described above, and a detection value of the lubricating oil pressure and a high or high level of the same lubricating oil pressure.
A pressure comparator device that compares a detected value of engine rotation speed with a low level setting value; When the lubricant pressure is within the range of the level setting value and is below the low level setting value, or when the engine speed is above the high level setting value and the lubricating oil pressure is below the high level setting value. The system is equipped with a control device that sends an activation signal to the alarm, and when an abnormality occurs in the lubricating oil system and the lubricating oil pressure decreases, an alarm can be immediately issued and the alarm can be activated to prevent damage to the bearing metal, etc. This has the effect of preventing burnout accidents.

Next, the lubricating oil pressure drop alarm system for an engine according to the present invention will be explained with reference to an embodiment shown in FIG. ~7 is a comparator, 8 is an F-V converter, 9
12 is a reference setter.

The reference setting device 9 sends a voltage signal corresponding to a preset high level lubricating oil pressure P2kg/cm2 (see Figure 2), and the reference setting device 10 outputs a voltage signal corresponding to a preset low level lubricating oil pressure P1kg. /cm□ (see Fig. 2), and the reference setter 11 sends out a voltage signal corresponding to a preset engine rotational speed RPM1 rpm (see Fig. 2). The reference setting device 12 sets the engine rotation speed RPM1r set in advance.
A voltage signal corresponding to an engine rotational speed RPM2rpm higher than pm is sent out.

Also, 13 to 15 are AND elements, 16 is an inverter, and 17
is an OR element, and 1B is an alarm equipped with a buzzer and lamp.

In this embodiment, the comparators 4 and 5 serve as a pressure comparator, the comparators 6 and 7 serve as a rotational speed comparator, and the AND elements 13 to 1
5 inverter 16 and OR element 17 each correspond to a control device.

Next, the operation of the engine lubricating oil pressure drop warning device will be explained.

When the power switch is turned on, a lubricating oil pressure detector 1 that detects lubricating oil pressure sends a signal corresponding to the detected lubricating oil pressure to comparators 4 and 5.

At this time, the lubricating oil pressure P is transmitted from the reference setter 9 to the comparator 4.
Since a reference signal equivalent to 2 kg/cm' is sent,
If the output from the lubricating oil pressure detector 1 to the comparator 4 is less than the lubricating oil pressure P2 kg/Cm'', the comparator 4 sends out a bi-level signal (hereinafter referred to as an H signal).

At this time, a reference signal corresponding to the lubricating oil pressure P1 kg/cm2 is sent from the reference setting device 10 to the comparator 5, so that the output from the lubricating oil pressure detector 1 to the comparator 5 is the lubricating oil pressure P1. kg/c111" or less, the comparator 5 outputs a bi-level signal (hereinafter referred to as an H signal).
Further, if the output from the lubricating oil pressure detector 1 to the comparator 5 is equal to or higher than the lubricating oil pressure PI kg/clII'', the comparator 5 sends out an H signal.

On the other hand, the engine rotation speed detector 2, which detects the engine rotation speed, sends a pulse signal proportional to the detected engine rotation speed to the F-V converter 8.
The converter 8 converts the pulse signal into a voltage signal,
Send to comparator 6.7.

At this time, a reference signal corresponding to the engine rotational speed PRMlrpm is sent from the reference setting device 11 to the comparator 6, so if the output from the F-V converter 8 to the comparator 6 is less than or equal to the engine rotational speed RPM1rPm. , the comparator 6 receives the L signal, and the output from the F-V converter 8 to the comparator 6 is the engine rotational speed RPM l rp
If it is greater than or equal to m, the comparator 6 sends out an H signal.

Also, at this time, a reference signal corresponding to the engine rotational speed RPM 2 rpm is sent from the reference setter 12 to the comparator 7, so that the reference signal corresponding to the engine rotation speed RPM 2 rpm is sent from the F-V converter 8 to the comparator 7.
If the output to the engine rotation speed RPM is less than 2 rpm, the comparator 7 outputs an L signal to the F-V converter 8.
The output from the comparator 7 is the engine rotation speed RPM2r.
If it is above pm, the comparator 7 sends out an H signal.

Therefore, as inverter 6, the engine rotation speed is RPM.
When the RPM is 1 rpm or less, the H signal is output, RPM 1 rpm
In the above cases, an L signal is sent out.

In addition, the input to the AND element 13 is that the lubricating oil pressure is P2kg.
/cxn□ or less, the H signal is output from the comparator 4, and when the engine rotation speed is RPM 2 rpm or more, the H signal is output from the comparator 7. It sends an H signal only when it enters.

In addition, the input to the AND element 14 is that the lubricating oil pressure is P1kg.
/cm□ or less, the H signal is output from the ratio below 5, and the engine rotation speed is RPM1 to RPM2 rpm.
and the H signal output from the ND element 15, and the AND element 14 sends out the H signal only when these two H signals are input.

Further, the OR element 17 sends an H signal to the alarm 18 to sound a buzzer or light a lamp only when an H signal is received from either the AND element 13, 14 or the lubricating oil level switch 3.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing an embodiment of an engine lubricating oil pressure drop warning device according to the present invention, and FIG. 2 is an explanatory diagram showing the relationship between engine rotational speed and lubricating oil pressure. 4.5...Pressure comparison device, 6,7...Rotation speed comparison device, 13-17...Control device, 18...Alarm device.

Claims (1)

[Scope of utility model registration request] An alarm device, a pressure comparison device that compares the detected value of lubricating oil pressure with the high and low level setting values of the same lubricating oil pressure, and a pressure comparator that compares the detected value of the engine rotational speed with the high and low level setting values of the same engine rotational speed. a rotational speed comparison device that compares the rotational speed of the engine when the rotational speed of the engine is within the range of the high and low level setting values and the lubricating oil pressure is below the low level setting, or when the engine rotational speed is within the range of the high level setting value. A lubricating oil pressure drop warning device for an engine as described above, further comprising a control device that sends an activation signal to the alarm when the lubricating oil pressure is below the high level set value.