WO2012121460A1

WO2012121460A1 - Oil mist detection apparatus having transparent-window contamination detection part, and transparent window contamination detection method for oil mist detection apparatus

Info

Publication number: WO2012121460A1
Application number: PCT/KR2011/006702
Authority: WO
Inventors: 이영우; 김영탁; 김응길; 김세진; 박주원
Original assignee: (주)광산
Priority date: 2011-03-08
Filing date: 2011-09-09
Publication date: 2012-09-13
Also published as: KR101045322B1

Abstract

The present invention relates to an oil mist detection apparatus having a transparent- window contamination detection part and to a transparent-window contamination detection method for oil mist detection apparatus. An oil mist detection apparatus having a transparent-window contamination detection unit according to the present invention comprises luminous elements, light receiving elements and transparent-windows provided in an oil mist detection tube disposed in the interior of an internal combustion engine, and has a transparent-window contamination detection unit comprising: a memory part for storing data for a set contamination reference time for the transparent-window based on the operation of the internal combustion engine, a reference variation in an amount of received light incident on the light receiving elements through the transparent-windows due to an increase in the average pulse voltage applied to the luminous elements prior to exposure to oil mists, and data on an allowable error range for the reference variation in the amount of received light; a sensor for monitoring the operational status of the internal combustion engine; a timer for cumulatively counting the operational periods of the internal combustion engine; and a control part for determining the transparent-windows as contaminated when the cumulative operational periods of the internal combustion engine reaches the set contamination reference time for the transparent-windows, and, for determining the transparent-windows as contaminated and issuing a warning when the internal combustion engine is not operational and the real amount of light incident on the light receiving elements through the transparent-windows is outside the allowable error range for reference variation in the amount of received light.

Description

Oil mist detection device having a floodlight contamination detection unit and a floodlight contamination detection method of the oil mist detection device

The present invention relates to an oil mist detection device having a floodlight contamination detection unit and a floodlight contamination detection method of the oil mist detection device, and more particularly, mechanical friction due to deterioration or wear of the mechanical coupling structure in the crank chamber of the internal combustion engine. Detects whether the light window is contaminated by the light scattering oil mist detection device that detects the concentration of oil mist generated by heating the lubricating oil on the surface by measuring the amount of light emitted through the light window, scattered by the oil mist, and then received by the light window. An oil mist detecting device having a light emitting window contamination detecting unit and a light emitting window contamination detecting method of the oil mist detecting device.

An occasional explosion of the crankcase of an internal combustion engine, such as a medium or large diesel engine used in ships, has been found to be due to the generation of excessive oil mist.

Therefore, in recent years, the internal combustion engines used in ships, etc. are being mandated to install an oil mist detection device that can detect the concentration of the oil mist and notify when it exceeds a certain value.

As a related art of such an oil mist detection apparatus, there is a "oil mist detection apparatus" of JP 10-2008-0058181, which is a prior art document disclosed in Figs. 8 is an overall perspective view of a conventional oil mist detection device, FIG. 9 is a state diagram in which a conventional oil mist detection device is coupled to an engine crankcase, and FIG. 10 is an oil mist detection device having a floodlight contamination detection unit of FIG. 9. It is an internal cross section.

As illustrated in FIGS. 8 to 10, the oil mist detection device according to the related art is emitted from the light emitting device 2, passes through the light emitting window W, collides with the oil mist, and is scattered thereafter. A part of scattered light incident is detected by the light receiving element 3, and a method of detecting the concentration of oil mist by converting the intensity of light received by the light receiving surface, that is, the amount of light received, into an electrical signal such as a voltage.

On the other hand, the oil mist detection device according to the related art has a control device having a contamination abnormality determination unit because a floodlight may be contaminated by the oil mist when time passes according to the operation of the internal combustion engine, thereby reducing the reliability of the oil mist concentration measurement. By measuring and setting the reference value (initial value) for the amount of light received in the absence of oil mist before the floodlight window W is polluted, the actual value is below the pollution determination threshold set below the initial value as the floodlight window is contaminated by the use of the engine. When the measured value of received light drops, it is considered as a contamination and proposes a technique for notifying when the floodlight is cleaned and replaced.

However, the prior art 'oil mist detection device' measures the amount of received light incident on the light-receiving element through the light transmission window separately from whether the internal combustion engine is in operation after use of the internal combustion engine, and then compares it with the pollution determination reference value to the lower pollution determination reference value. If the value of received light is obtained, it is considered to be a contamination, and such measurement is preferably performed at the engine stopped state for the accuracy of the measurement. Therefore, the internal combustion engine mounted on the ship, which requires long-term operation for precision measurement, should be stopped arbitrarily. There was an inconvenience in detecting floodlight contamination.

On the other hand, since the interior of the internal combustion engine may not only oil mist, but also liquid oil fine particles or other foreign matters, the oil mist as well as such oil fine particles or other foreign matters may be contaminated by the light transmission window. In this case, the oil fine particles or other foreign matters on the light transmission window may cause abnormal excessive scattering of light emitted by the light emitting device at a certain intensity in some cases, thereby increasing the light reception value abnormally. However, in the case of the conventional oil mist detection device, if the light reception value abnormally increased due to excessive light scattering does not satisfy the condition below the pollution determination standard value, it is determined that the pollution is not contaminated even though the floodlight is contaminated, and thus, There was a problem that it was impossible to accurately measure the oil mist concentration.

Therefore, the technical problem to be solved by the present invention is to solve the above problems by warning whether the pollution of the floodlight window is determined when the predetermined pollution determination threshold set individually according to the case of the operation and the stop, regardless of the operation of the internal combustion engine Accordingly, the present invention provides an oil mist detection device and a method for detecting oil pollution of an oil mist detection device having a light pollution detection unit that can facilitate the pollution detection of the emission window and ensure continuous operation of the internal combustion engine.

The technical problem to be solved by the present invention is to solve the above problems by causing abnormal excessive scattering of light emitted by a light emitting device at a certain intensity due to oil fine particles or other foreign matter on the contaminated floodlight window, the value of the received light is common Oil mist detection device having a floodlight contamination detection unit that can detect the contamination of the floodlight more precisely by warning that the floodlight is contaminated even if abnormally increased compared to the above, thereby improving the reliability of the oil mist detection device. An object of the present invention is to provide a method for detecting pollution of a floodlight in an oil mist detection device.

The oil mist detection device having a floodlight contamination detection unit according to the present invention for solving the above problems is an oil mist detection device including a light emitting element, a light receiving element and a light emitting window provided in an oil mist detection tube mounted inside an internal combustion engine. as,

Standard change amount of the light reception incident on the light receiving element through the light transmission window according to the set pollution reference time data of the light transmission window according to the operation of the internal combustion engine and the increase in the pulse average voltage applied to the light emitting device before exposure to the oil mist and The memory unit stores the reference change amount tolerance range data of the received light amount, a sensor for detecting the operation of the internal combustion engine, a timer for accumulating the operating time of the internal combustion engine, and a cumulative operating time of the internal combustion engine. When the light transmission window setting pollution reference time is reached, the light transmission window is determined to be contaminated, and when the internal combustion engine is inactive, the light transmission window is incident to the light receiving device through the light transmission window according to the increase in the pulse average voltage applied to the light emitting device. The actual amount of received light does not exceed the reference variation tolerance of the amount of received light. In case of deviation, the floodlight contamination detection unit includes a control unit that warns by determining that the floodlight window is contaminated.

Preferably, the pulse average voltage is cumulatively increased from 1% to 99.9% of the voltage on time with respect to the voltage off time per pulse period as the time increases.

The detection sensor is a vibration detection sensor for detecting the vibration of the internal combustion engine,

The control unit may determine whether the internal combustion engine is operating or not by analyzing the signal of the vibration sensor.

The reference change allowance range of the received light amount is an upper limit reference light receiving amount and a lower limit reference light receiving amount with respect to the reference light receiving amount experimentally measured by the light receiving element incident through the light transmission window according to the increase in the pulse average voltage before the oil mist exposure. It is desirable that this is within ± 10%.

On the other hand, the oil mist detection method of the oil mist detection apparatus according to the present invention for solving the above problems is an oil mist including a light emitting element, a light receiving element and a light emitting window provided in the oil mist detection tube mounted inside the internal combustion engine A method of detecting pollution in a floodlight of a detection device, the method comprising: detecting whether the internal combustion engine is in operation, counting and storing an operating time when the internal combustion engine is in operation, and storing the accumulated operating time of the internal combustion engine Judging whether the set pollution reference time of the floodlight has been reached according to the operation; if the accumulated stored operating time reaches the set pollution reference time, determining that the floodlight is contaminated and warning; Pulse average voltage applied to the light emitting element when in operation Measuring an actual amount of light incident on the light receiving element through the light transmission window according to an increase of, and determining whether the measured light reception amount exceeds a reference variation tolerance of the amount of light received before exposure to the oil mist of the previously stored light transmission window; And determining that the floodlight window is contaminated and warning if the measured light reception amount exceeds a reference variation tolerance of the light reception amount.

In the step of measuring the actual amount of received light incident on the light receiving element, the pulse average voltage is a ratio of the voltage on time to the voltage off time per 1 pulse period as time increases from 1% to 99.9% It is desirable to increase cumulatively.

The step of detecting whether the internal combustion engine is running may detect whether the internal combustion engine is vibrated through a vibration sensor, and when the internal combustion engine is in operation, the vibration detection sensor may be configured according to the vibration generated by the operation of the internal combustion engine. It is desirable to generate a signal.

In the determining whether the measured light receiving amount exceeds a reference variation tolerance of the received light amount before exposure to the oil mist of the previously transmitted light window, the reference variation tolerance of the light receiving amount is equal to the pulse average voltage before the oil mist exposure. It is preferable that the upper limit reference light receiving amount and the lower limit reference light receiving amount are within ± 10% with respect to the reference light receiving amount measured experimentally by the light receiving element incident through the light transmitting window with increasing.

In the determining whether the measured light receiving amount exceeds a reference variation tolerance range of the light receiving amount before exposure to the oil mist of the previously stored light emitting window, the pulse average voltage is off per one pulse period as time increases. If the measured light receiving amount does not exceed the reference variation tolerance of the light receiving amount in the entire period in which the ratio of voltage on time to cumulative increase from 1% to 99.9% does not reach the pollution reference value I do not think.

In the determining whether the measured light receiving amount exceeds a reference variation tolerance range of the light receiving amount before exposure to the oil mist of the previously stored light emitting window, the pulse average voltage is off per voltage period as the time increases. If the measured light receiving amount is less than the lower limit standard light receiving amount of the standard change amount tolerance of the light receiving amount in some of all sections in which the ratio of voltage on time to cumulatively increases from 1% to 99.9%, Due to the general decrease in light scattering, it is determined that the amount of light received by the light receiving element is reduced.

In the determining whether the measured light receiving amount exceeds a reference variation tolerance range of the light receiving amount before exposure to the oil mist of the previously stored light emitting window, the pulse average voltage is off per one pulse period as time increases. When the measured light receiving amount is greater than the upper limit standard receiving amount of the standard change amount tolerance of the received light amount in some sections in which the ratio of the voltage on time to the time is cumulatively increased from 1% to 99.9%, It is determined that the amount of light received by the light receiving element has increased due to an abnormal increase in light scattering.

As described above, according to the oil mist detecting apparatus and the oil mist detecting apparatus of the oil mist detecting apparatus having the floodlight contamination detecting unit according to the present invention, regardless of whether the internal combustion engine is operated or not, the oil mist detecting apparatus can be individually When the predetermined predetermined pollution determination reference value is reached, it is determined that the pollution of the floodlight is determined, and thus there is an advantageous effect to facilitate the detection of the pollution of the floodlight and to ensure continuous operation of the internal combustion engine.

In addition, according to the oil mist detecting apparatus and the oil mist detecting method of the oil mist detecting apparatus having a light emitting window contamination detecting unit according to the present invention, due to the oil fine particles or other foreign matters on the contaminated light emitting window, It is possible to detect the contamination of the floodlight by detecting the pollution of the floodlight even when the value of received light is abnormally increased compared to the general case by inducing the excessive excessive scattering of the emitted light. There is an advantageous effect that can be improved.

1 is a state in which an oil mist detection device having a floodlight contamination detection unit according to an embodiment of the present invention is coupled to an engine crankcase of an internal combustion engine;

FIG. 2 is a cross-sectional view of an oil mist detection device having a floodlight contamination detection unit according to an embodiment of the present invention shown in FIG. 1 taken along line II-II; FIG.

3 is a block diagram illustrating an oil mist detection device having a floodlight contamination detection unit according to an embodiment of the present invention;

4 is a graph showing the voltage pattern measured by the vibration detection sensor of the floodlight contamination detection unit according to an embodiment of the present invention during the stop and the operation of the internal combustion engine,

FIG. 5 is a diagram illustrating the operation of the internal combustion engine, and the upper graph shows the pulse average voltage applied to the light emitting device of the oil mist detection apparatus according to an embodiment of the present invention at a voltage off time per one pulse period as time increases. The graph shows a cumulative increase in the ratio of the voltage on time to the light emitting device, and the lower graph is incident to the light receiving device through the light transmission window before the oil mist exposure when the pulse average voltage applied to the light emitting device increases with time. A graph showing the standard received light experimentally measuring the amount of received light received, the upper and lower reference light received at the determination of contamination, and the actual measured change in received light after exposure to oil mist,

FIG. 6 is a graph continuously converting a pulse average voltage applied to a light emitting device into an analog average voltage as time increases, which is the upper graph of FIG. 5;

7 is a flow chart sequentially illustrating a method of detecting a pollution of a window of an oil mist detection apparatus having a floodlight contamination detection unit according to an embodiment of the present invention;

8 is an overall perspective view of a conventional oil mist detection device,

9 is a state diagram in which a conventional oil mist detection device is coupled to an engine crankcase of an internal combustion engine, and

10 is an internal cross-sectional view of the oil mist detection device having the floodlight contamination detection unit of FIG. 9.

* Explanation of symbols on main parts of the drawings *

DESCRIPTION OF SYMBOLS 1 Oil mist detection apparatus 100 Oil mist detection part

110: oil mist detection tube 112: oil mist outflow inlet

120: light emitting element 125: light receiving element

140: lens 150: floodlight

200: floodlight contamination detection unit 210: memory unit

220: detection sensor 230: timer

240 control unit 250 display unit

Specific details of other embodiments are included in the detailed description and drawings.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and those skilled in the art to which the present invention pertains. It is provided to fully inform the scope of the invention, and the invention is defined only by the scope of the claims.

Like reference numerals refer to like elements throughout. Embodiments described herein will be described with reference to ideal state diagrams, cross-sectional views, configuration block diagrams, graphs, and flow charts of the present invention.

Hereinafter, an oil mist detection device having a floodlight contamination detection unit and a floodlight contamination detection method of the oil mist detection device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

First, an oil mist detection apparatus having a floodlight contamination detection unit according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6.

1 is a state in which an oil mist detection device having a floodlight contamination detection unit according to an embodiment of the present invention is coupled to an engine crankcase of an internal combustion engine, and FIG. 2 is according to an embodiment of the present invention shown in FIG. 1. Sectional drawing which cut | disconnected and showed the oil mist detection apparatus which has a floodlight contamination detection part along the II-II line, FIG. 3 is a block diagram of the oil mist detection apparatus which has a floodlight contamination detection part which concerns on one Embodiment of this invention, FIG. Is a graph showing a voltage pattern measured by the vibration detection sensor of the floodlight contamination detection unit according to an embodiment of the present invention during and during the operation of the internal combustion engine, and FIG. The pulse average voltage applied to the light emitting device of the oil mist detecting apparatus according to an embodiment of the present invention is for the voltage off time per one pulse period as the time increases. The graph shows that the ratio of the on time is cumulatively increased, and the lower graph is incident to the light receiving device through the light transmission window before the oil mist exposure when the pulse average voltage applied to the light emitting device increases with time. A graph showing a reference received light experimentally measured the amount of received light, the upper and lower reference light received by the determination of contamination, and the actual measured change in received light after exposure to oil mist, and FIG. 6 is applied to the light emitting device according to an increase in time, which is an upper graph of FIG. 5. It is a graph that continuously converts the pulse average voltage to analog average voltage.

The oil mist detection apparatus 1 having the floodlight contamination detection unit according to an embodiment of the present invention includes an oil mist detection unit 100 and a floodlight contamination detection unit 200.

As illustrated in FIGS. 1 to 3, the oil mist detection unit 100 detects an oil mist concentration inside the engine during operation of the internal combustion engine, and is inserted into and coupled to the engine crank case 10. The oil mist outlet inlet 112 and a light emitting device 120, a light receiving device 125, a lens 140 and a light-emitting window 150 embedded in the inside of the one side is included. Since the oil mist detection unit 100 is described in detail in the above-described [Background Art], a detailed description thereof will be omitted.

The floodlight pollution detection unit 200 measures whether the floodlight 150 of the oil mist detection unit 100 is contaminated differently while the internal combustion engine is operated and stopped, i.e., when the internal combustion engine is not in operation. If it is determined that the pollution of the floodlight 150 to the manager to inform the time of cleaning or replacement of the floodlight 150. To this end, the floodlight contamination detection unit 200 is configured to include a memory unit 210, a detection sensor 220, a timer 230, a control unit 240, and a display unit 250.

The memory unit 210 stores information data regarding a set pollution reference time of the floodlight 150 according to the operation of the internal combustion engine. Information regarding the set contamination reference time is considered that the floodlight 150 is gradually contaminated by oil mist, oil fine particles or other foreign substances generated inside the crankcase due to the operation of the internal combustion engine in consideration of the operating conditions or the situation of the internal combustion engine. It is information on a pollution arrival time that requires cleaning or replacement of the floodlight 150, and is time information that is actually measured and averaged experimentally.

In addition, the memory unit 210 has a pulse on / off ratio applied to the light emitting device 120 before the oil mist of the floodlight 150 is exposed, that is, in a state where the floodlight 150 is clean. In response to the change in the average voltage applied to the light emitting device 120 according to the change of the reference light receiving amount and the tolerance range data of the change in the amount of light received by the light receiving element 125 through the light transmission window 150 is stored. .

The detection sensor 220 detects whether the internal combustion engine is operating, and in this embodiment, a vibration detection sensor such as a vibrator or a vibration coil is used. In addition, the vibration sensor may be provided using an acceleration sensor.

The timer 230 accumulatively counts each operating time T ₁ , T ₂ , T ₃ , and T _{n of} the internal combustion engine, and transmits information about the total operating time of the internal combustion engine to the controller 240.

When the cumulative operating time of the internal combustion engine transmitted from the timer 230 reaches the floodlight setting pollution reference time, the controller 240 determines that the floodlight 150 is contaminated and warns it through the display unit 250. In addition, when the internal combustion engine is inactive due to the anchoring of a ship or the like, the controller 240 may emit light according to a change in a pulse on / off ratio applied to the light emitting device 120. In response to the change in the average voltage applied to the light receiving element 125 through the light receiving element 125, if the actual amount of light received outside the standard change amount tolerance range of the light receiving amount is determined that the light emitting window 150 is contaminated and warned do.

Meanwhile, the controller 240 is configured to simultaneously control the light emitting device 120 and the light receiving device 125 of the oil mist detector 100, as illustrated in FIG. 3, but the oil mist detector 100 is a separate controller 240. You may have

The display unit 250 is provided as a visual or audio display means that can display a warning of the pollution state of the floodlight 150 to the administrator.

Hereinafter, the method of detecting the pollution of the floodlight of the oil mist detection apparatus according to the exemplary embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7.

FIG. 7 is a flowchart sequentially illustrating a method of detecting a pollution of a window of an oil mist detection apparatus having a floodlight contamination detecting unit according to an exemplary embodiment of the present invention.

As shown in FIG. 7, the method of detecting pollution of the floodlight of the oil mist detection apparatus according to the exemplary embodiment of the present invention first detects whether the internal combustion engine is running using the vibration sensor 220 (S10).

As shown in FIG. 4, when the vibration sensor 220 is vibrated by the operation of the internal combustion engine, a signal due to vibration during each operation time T ₁ , T ₂ , T ₃ , and T _n , namely, an on voltage (Logic High). ) And off voltage (Logic Low) are alternately generated. When the internal combustion engine is stopped, only the off voltage signal is generated during the stop time (T _off ). Therefore, when the voltage signal sensed from the vibration sensor 220 is input, the controller 240 can easily check whether the internal combustion engine is operating.

As a result of detecting whether the internal combustion engine is running (S10), when the control unit 240 determines that the internal combustion engine is in operation, the control unit 240 receives the information on the accumulated operating time of the counted internal combustion engine. The accumulated total operating time (T ₁ , T ₂ , T ₃ , T _n ) information is updated and stored in real time in the memory unit 210 (S20).

Thereafter, the controller 240 determines whether the total cumulative operating time of the internal combustion engine stored in the memory unit 210 that is updated in real time reaches the floodlight setting pollution reference time previously stored in the memory unit 210 (S30). .

As a result of the determination of the control unit (S30), when the operation time accumulated in the memory unit 210 reaches the floodlight setting pollution reference time, it is determined that the floodlight 150 is contaminated and the contamination is displayed on the display unit 250. By alerting the manager of the time of cleaning or replacing the floodlight 150 (S40). As described above, according to the method for detecting pollution of the window using the oil mist detection device 1 having the floodlight contamination detection unit 200 according to an embodiment of the present invention, each operation time of the internal combustion engine in the state where the internal combustion engine is in operation ( If the total operating time of T ₁ , T ₂ , T ₃ , and T _n ) is already measured experimentally and reaches the stored floodlight setting pollution reference time, it may be determined that the floodlight 150 is contaminated and alert. Therefore, it is not necessary to stop the internal combustion engine arbitrarily to check whether the floodlight 150 is contaminated as in the prior art, which is suitable for measuring the pollution of the floodlight of an oil mist detection device installed in an internal combustion engine such as a ship requiring long-term continuous operation. There is this.

On the other hand, when the internal combustion engine is stopped and stopped due to the ship's berth, etc., the incident light enters the light receiving element 125 through the light transmission window 150 due to the increase in the pulse average voltage applied to the light emitting element 120. The actual amount of received light is measured (S22).

As shown in the upper part of FIG. 5, the pulse average voltage has a ratio of the voltage application time T _ON to the voltage off time T _OFF per one pulse period T _{PERIOD as the} time increases from 1%. Cumulative increase to 99.9%. That is, as shown in FIG. 6, since the pulse average voltage increases not as a constant but increases as time increases, the light emitting device 120 does not emit light with a constant intensity, but as the time increases, the emission intensity increases.

As shown in FIG. 2, not only the oil mist 5 but also the oil fine particles or other foreign matter 6 may be included in the internal combustion engine. Therefore, the oil mist 5, as well as the oil fine particles or other foreign matter 6 may be buried in the floodlight 150 to contaminate the floodlight 150.

Such oil fine particles or other foreign matters 6 may impede light scattering only for light emitted from the light emitting device 120 at a predetermined light intensity by applying a specific pulse average voltage even when contaminating the light emitting window 150. Increasingly, the measured amount of received light varies greatly. On the other hand, when the pulse average voltage is not applied, light scattering inhibition or increase is minimal, and the value of the received light amount does not change significantly, but the light emitting window 150 is not contaminated even though the light emitting window 150 is contaminated. You can also judge. Therefore, in order to solve this problem, the present invention, unlike the prior art, increases the pulse average voltage applied to the light emitting device 120 at a voltage off time T _OFF per one pulse period T _PERIOD according to an increase in time. By accumulating and increasing the ratio of the voltage application time (T _ON ) from 1% to 99.9%, the light emitting device 120 emits light at various light intensities so that the contamination of the floodlight 150 can be more accurately measured.

Next, based on the measurement result (S22) of the received light amount, the control unit 24 actually exceeds the standard change amount tolerance range of the received light amount before the oil mist exposure of the light transmission window 150 previously stored in the memory unit 210. It is determined by comparing with each other whether or not (S32).

Here, the reference variation tolerance range of the received light amount is a reference received light experimentally measured the amount of light incident on the light receiving element 125 according to the increase in the pulse average voltage before the oil mist exposure of the light transmission window 150 as shown in FIG. It is a range provided so that the contamination determination upper limit reference light receiving amount and the contamination determination lower limit reference light receiving amount may be within ± 10%, and preferably within the range of ± 5%. The tolerance range is preferably set within a range defined by the user as an error tolerance available range for the accuracy and reliability of the reference received quantity, which is a change in the received quantity of experimentally measured.

However, the standard change amount tolerance range of the received light amount can be added or subtracted based on the information measured through the experiment according to the operating state of the internal combustion engine, the performance of the light transmission window 150, and the like.

As a result of the determination of the control unit 240, when the measured light receiving amount exceeds the standard change amount tolerance range of the light receiving amount (S34), it is determined that the light transmission window 150 is contaminated and warns it to the display unit 250 (S40).

Referring to this step in more detail with reference to FIG. 5, first, as can be seen from the actual measured light receiving amount 1 curve, as the time increases, the pulse average voltage is applied to a voltage off time per one pulse period ( on) When the light reception amount measured in the entire section where the ratio of time is increased from 1% to 99.9% does not exceed the standard change amount tolerance range of the light reception amount, the control unit 240 emits light through the oil fine particles or other foreign matters. It is determined that the contamination of 150 is small and light scattering inhibition or increase is small, so that the floodlight 150 is in a normal state without contamination.

Also, as can be seen from the actual measured light receiving amount 2 curve, if the pulse average voltage increases with time, the ratio of voltage on time to voltage off time per pulse period is from 1% to 99.9%. When the received light amount measured in some sections (Tb and subsequent sections) of the cumulative increase is smaller than the lower limit standard received light amount of the standard change amount tolerance range of the received light amount, the controller 240 controls the floodlight window due to oil fine particles or other foreign matters. It is determined that the amount of light received by the light receiving element 125 is significantly reduced due to the general light scattering inhibition due to the contamination of 150, and the display unit 250 warns that the light transmission window 150 is contaminated.

On the other hand, as can be seen from the actual measured light reception 3 curve, if the pulse average voltage increases with time, the ratio of the voltage on time to the voltage off time per pulse period accumulates from 1% to 99.9%. When the received light amount measured in some sections (sections after Ta) of all the increased sections is larger than the upper limit reference received amount of light in the standard change amount tolerance range of the received light amount, the controller 240 transmits the light emitting window 150 by oil fine particles or other foreign substances. It is determined that the amount of light received by the light receiving element 125 is excessively increased due to abnormal light scattering due to contamination of the light emitting device 125, and the display unit 250 warns that the floodlight 150 is contaminated.

Although the preferred embodiment of the present invention has been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of the process using the basic concept of the present invention as defined in the following claims are also possible. It belongs to the scope of the invention.

As described above, according to the oil mist detecting apparatus and the oil mist detecting apparatus of the oil mist detecting apparatus having the floodlight contamination detecting unit according to the present invention, regardless of whether the internal combustion engine is operated or not, the oil mist detecting apparatus can be individually When the predetermined predetermined pollution determination reference value is reached, the control unit judges that the floodlight is contaminated and alerts the display unit to facilitate the detection of the pollution of the floodlight and to ensure continuous operation of the internal combustion engine.

In addition, according to the oil mist detecting apparatus and the oil mist detecting apparatus of the oil mist detecting apparatus having the light emitting window contamination detecting unit according to the present invention, due to the oil fine particles or other foreign matter on the contaminated light emitting window, it is specified by the light emitting element. It is an industrially useful invention that can detect the contamination of the floodlight more precisely by determining that the floodlight is polluted even when the light reception value is abnormally increased due to the abnormal excessive scattering of the light emitted by the intensity.

Claims

An oil mist detecting apparatus including a light emitting element, a light receiving element, and a light emitting window provided in an oil mist detecting tube mounted inside an internal combustion engine,
Reference change amount of the light reception incident to the light receiving element through the light transmission window according to the set pollution reference time data of the light transmission window according to the operation of the internal combustion engine and the increase in the pulse average voltage applied to the light emitting device before exposure to the oil mist and A memory unit for storing reference variation tolerance range data of received light amount;
A detection sensor for detecting whether the internal combustion engine is operating;
A timer for accumulating counting operating time of the internal combustion engine, and
If the cumulative operating time of the internal combustion engine reaches the floodlight setting pollution reference time, it is determined that the floodlight is contaminated, and when the internal combustion engine is inactive, the light emission is caused by an increase in the average pulse voltage applied to the light emitting device. A control unit which determines that the light transmission window is contaminated and warns when the actual light reception amount incident to the light receiving element through the window is out of a standard variation tolerance range of the light reception amount
Floodlight pollution detection unit comprising a
Oil mist detection device having a.
In claim 1,
The pulse average voltage is cumulatively increased from 1% to 99.9% of the ratio of voltage on time to voltage off time per pulse period as time increases.
An oil mist detection device having a floodlight contamination detection unit.
In claim 1,
The detection sensor
Vibration detection sensor for detecting the vibration of the internal combustion engine,
The control unit
Analyzing the signal of the vibration sensor to determine whether the internal combustion engine is running or not
An oil mist detection device having a floodlight contamination detection unit.
In claim 1,
The reference variation tolerance of the received light amount is
The upper limit reference light receiving amount and the lower limit reference light receiving amount are within ± 10% of the reference light receiving amount experimentally measured by the light receiving element through the light transmission window according to the increase of the pulse average voltage before the oil mist exposure.
An oil mist detection device having a floodlight contamination detection unit.
A method of detecting pollution of a light window of an oil mist detection device including a light emitting element, a light receiving element, and a light emitting window provided in an oil mist detection tube mounted inside an internal combustion engine,
Detecting whether the internal combustion engine is running;
Accumulating and storing an operating time when the internal combustion engine is operating as a result of the detection;
Determining whether the accumulated and stored operating time reaches a set pollution reference time of the floodlight window according to the operation of the internal combustion engine;
Determining that the floodlight is contaminated and warning when the cumulative stored operation time reaches a predetermined pollution reference time;
Measuring the actual amount of light incident on the light receiving element through the light transmission window according to the increase in the pulse average voltage applied to the light emitting element when the internal combustion engine is not running;
Determining whether the measured amount of received light exceeds a reference variation tolerance of the amount of received light prior to exposure to oil mist of the previously transmitted light window; and
Determining that the floodlight window is contaminated and warning if the measured light reception amount exceeds a standard variation tolerance of the light reception amount
Containing
Floodlight contamination detection method of oil mist detection device.
In claim 5,
In the step of measuring the actual amount of received light incident on the light receiving element,
The pulse average voltage is cumulatively increased from 1% to 99.9% of the ratio of voltage on time to voltage off time per pulse period as time increases.
Floodlight contamination detection method of oil mist detection device.
In claim 5,
Detecting whether the internal combustion engine is running,
The vibration sensor detects whether the internal combustion engine is vibrated,
When the internal combustion engine is in operation, the vibration detecting sensor generates a signal according to vibration generated by the operation of the internal combustion engine.
Floodlight contamination detection method of oil mist detection device.
In claim 6,
In the step of determining whether the measured light receiving amount exceeds the standard change amount tolerance range of the light receiving amount before exposure to the oil mist of the previously transmitted light window,
The reference variation tolerance of the received light amount is
The upper limit reference light receiving amount and the lower limit reference light receiving amount are within ± 10% of the reference light receiving amount experimentally measured by the light receiving element through the light transmission window according to the increase of the pulse average voltage before the oil mist exposure.
Floodlight contamination detection method of oil mist detection device.
In claim 8,
In the step of determining whether the measured light receiving amount exceeds the standard change amount tolerance range of the light receiving amount before exposure to the oil mist of the previously transmitted light window,
The measured amount of received light is measured over the entire period in which the ratio of the voltage on time to the voltage off time per pulse period is increased from 1% to 99.9% as the pulse average voltage increases with time. If the standard variation does not exceed the tolerance range, it is determined that the floodlight does not reach the pollution threshold.
Floodlight contamination detection method of oil mist detection device.
In claim 8,
In the step of determining whether the measured light receiving amount exceeds the standard change amount tolerance range of the light receiving amount before exposure to the oil mist of the previously transmitted light window,
The measured amount of received light is measured in some of all sections in which the ratio of the voltage on time to the voltage off time per pulse period is increased from 1% to 99.9% as the pulse average voltage increases with time. When the amount of light received by the light receiving element is reduced due to the general decrease in light scattering due to the pollution of the light transmission window when the amount of received light is smaller than the lower limit of standard received light tolerance
Floodlight contamination detection method of oil mist detection device.
In claim 8,
In the step of determining whether the measured light receiving amount exceeds the standard change amount tolerance range of the light receiving amount before exposure to the oil mist of the previously transmitted light window,
The measured amount of received light is measured in some of all sections in which the ratio of the voltage on time to the voltage off time per pulse period is increased from 1% to 99.9% as the pulse average voltage increases with time. When the light receiving amount is larger than the upper limit reference light receiving amount tolerance range, it is determined that the light receiving amount incident on the light receiving element is increased due to abnormal light scattering due to the pollution of the light transmission window.
Floodlight contamination detection method of oil mist detection device.