CN113175401A - Method and device for judging failure of coarse filtration filter element of filter - Google Patents
Method and device for judging failure of coarse filtration filter element of filter Download PDFInfo
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- CN113175401A CN113175401A CN202110528613.2A CN202110528613A CN113175401A CN 113175401 A CN113175401 A CN 113175401A CN 202110528613 A CN202110528613 A CN 202110528613A CN 113175401 A CN113175401 A CN 113175401A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
- F02M37/40—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements with means for detection of clogging
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Abstract
The invention discloses a method and a device for judging failure of a coarse filtration filter element of a filter, and relates to the technical field of filters. The method for judging the failure of the coarse filtration filter element of the filter comprises the following steps: monitoring rough filtration pressure difference in N collection steps in a rough filtration filter element failure monitoring state, calculating rough filtration pressure difference change rate, monitoring pressure after fine filtration in M collection steps if the rough filtration pressure difference change rate is smaller than a rough filtration pressure difference change rate threshold value, and calculating pressure change rate after fine filtration, wherein N and M are positive integers; and if the pressure change rate after the fine filtration is smaller than the pressure change rate threshold value after the fine filtration, judging that the rough filtration filter element is invalid. The method for judging the failure of the coarse filtration filter element of the filter can assist a user to find and replace the failed coarse filtration filter element in time, and further damage to the fine filtration filter element is avoided; the maintenance cost is reduced, and the possibility of fuel system failure is reduced.
Description
Technical Field
The invention relates to the technical field of filters, in particular to a method and a device for judging failure of a rough filtering filter element of a filter.
Background
In the working process of the engine, metal abrasive dust, carbon deposit oxidized at high temperature, colloidal precipitate, water and the like are continuously mixed into fuel oil. Impurities in fuel oil are generally filtered through a fuel filter, so that the impurities are prevented from entering a fuel injection system, and finally the fault of the fuel system is caused.
The fuel filter comprises a coarse filter element and a fine filter element, the coarse filter element is used for separating large-particle impurities and water in fuel, the fine filter element is used for separating small-particle impurities in the fuel, and the coarse filter element and the fine filter element jointly process the large-particle impurities and the small-particle impurities and the water in the fuel to ensure the cleanliness of the fuel. When the coarse filter element fails, the blockage of the fine filter element is increased, the fine filter element may fail under severe conditions, impurities enter the oil injection system, and finally the whole fuel system fails. In the prior art, whether a filter element fails or not is judged by judging whether the oil inlet-return pressure difference is greater than a preset upper limit value of the pressure difference, once the oil inlet-return pressure difference is greater than the preset upper limit value of the pressure difference, a rough filtering filter element and a fine filtering filter element both fail, and impurities may enter a fuel injection system, so that the whole fuel system fails.
Disclosure of Invention
The invention aims to provide a method and a device for judging failure of a coarse filter element of a filter, which can effectively detect the failed coarse filter element in time and avoid failure of a fine filter element, thereby reducing the possibility of failure of a fuel system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for judging failure of a coarse filtration filter element of a filter comprises the following steps:
monitoring rough filtration pressure difference in N collection steps in a rough filtration filter element failure monitoring state, calculating rough filtration pressure difference change rate, monitoring pressure after fine filtration in M collection steps if the rough filtration pressure difference change rate is smaller than a rough filtration pressure difference change rate threshold value, and calculating pressure change rate after fine filtration, wherein N and M are positive integers;
and if the pressure change rate after the fine filtration is smaller than the pressure change rate threshold after the fine filtration, judging that the rough filtration filter element is invalid.
Optionally, before the step of monitoring the coarse filtration pressure difference in N collection steps in the coarse filtration filter element failure monitoring state, the method further comprises the following steps:
and judging whether the coarse filtration filter element enters a failure monitoring state or not.
Optionally, the method for determining whether to enter the coarse filter element failure monitoring state includes: monitoring rough filtration pressure difference and engine speed within set time, judging whether the average value of the rough filtration pressure difference within the set time is greater than a high-pressure failure pressure difference threshold value or not, and whether the engine speed is greater than a high-pressure failure speed threshold value or not, and entering a rough filtration filter element failure monitoring state if the average value of the rough filtration pressure difference and the engine speed are both met; if either one of the two is not satisfied, the monitoring is continued.
Optionally, the method further comprises: and if the rough filtration differential pressure change rate is greater than or equal to the rough filtration differential pressure change rate threshold value, continuing the step of judging whether to enter a rough filtration filter element failure monitoring state.
Optionally, the method further comprises: and if the pressure change rate after the fine filtration is greater than or equal to the pressure change rate threshold after the fine filtration, continuing the step of judging whether to enter the coarse filtration filter element failure monitoring state.
Optionally, the coarse filtration pressure difference change rate threshold is calibrated according to the rotation speed of the engine, the rotation speed of the engine is different, and the coarse filtration pressure difference change rate threshold is different.
Optionally, the post-fine-filtration pressure change rate threshold is calibrated according to fuel oil temperatures, which are different, and the post-fine-filtration pressure change rate threshold is different.
Optionally, the following step is further included after the step of judging that the coarse filter element is failed: and sending the rough filtering filter element failure prompt to a user.
The device for judging the failure of the coarse filtration filter element of the filter is applied to any one of the methods for judging the failure of the coarse filtration filter element of the filter, and comprises a differential pressure sensor and a pressure sensor, wherein the differential pressure sensor is used for detecting the coarse filtration differential pressure, and the pressure sensor is used for detecting the pressure after the fine filtration.
Optionally, the device for judging failure of the filter coarse filtration filter element further comprises an oil temperature sensor, and the oil temperature sensor is used for detecting the oil temperature of fuel in a fuel system.
The invention has the beneficial effects that:
according to the method for judging the failure of the coarse filtration filter element of the filter, when the coarse filtration filter element is damaged or is positioned at the blocking edge and the rotating speed of an engine is higher, the coarse filtration filter element is considered to be possibly failed, and the state of monitoring the failure of the coarse filtration filter element is entered. And under the condition of monitoring the failure of the rough filtering filter element, judging that the rough filtering filter element fails when the pressure difference change rate of the rough filtering filter element is smaller than the rough filtering pressure difference change rate threshold value and the pressure change rate after the fine filtering is smaller than the pressure change rate threshold value after the fine filtering. The method for judging the failure of the coarse filter element of the filter can assist a user to find and replace the failed coarse filter element in time, and further damage to the fine filter element is avoided; early faults are found in time, maintenance cost is reduced, and the possibility of fault occurrence of a fuel system is reduced.
The invention provides a device for judging failure of a coarse filtration filter element of a filter, which comprises a differential pressure sensor and a pressure sensor, wherein the differential pressure sensor is used for detecting coarse filtration differential pressure, and the pressure sensor is used for detecting pressure after fine filtration. And calculating the coarse filtration differential pressure change rate in the N acquisition step lengths through the coarse filtration differential pressure detected by the differential pressure sensor, and comparing the calculated coarse filtration differential pressure change rate with a coarse filtration differential pressure change rate threshold value. And calculating the pressure change rate after fine filtration in M acquisition step lengths through the pressure after fine filtration detected by the pressure sensor, and comparing the calculated pressure change rate after fine filtration with the pressure change rate threshold after fine filtration. The judging device for judging the failure of the coarse filtering filter element of the filter can judge whether the coarse filtering filter element fails or not, and is maintained or replaced according to the judgment result, so that the maintenance cost is reduced, and the possibility of the failure of a fuel system is reduced.
Drawings
FIG. 1 is a first flowchart of a method for determining failure of a coarse filter element of a filter according to an embodiment of the present invention;
fig. 2 is a second flowchart of a method for determining failure of a coarse filter element of a filter according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The filter includes coarse filtration filter core and essence filter core, and the coarse filtration filter core sets up before the essence filter core, and at the filterable in-process of fuel, impurity in the fuel filters impurity and water of great granule through the coarse filtration filter core earlier, then filters impurity and water of less granule through the essence filter core and then gets into oil injection system again. In the working process of the engine, the higher the engine speed is, the higher the fuel pressure in the fuel system is, and the higher the pressure passing through the filter coarse filtering filter element is. If the particles of the impurities in the fuel oil are too large and exceed the filtering capacity of the rough filtering filter element, under normal oil pressure, the large particles of the impurities exceeding the filtering capacity of the rough filtering filter element cannot pass through the rough filtering filter element, so that the rough filtering filter element is blocked, and the rough filtering pressure difference is increased. In the blocked state of the coarse filter element, if the engine speed increases, the oil pressure in the fuel system also increases, and under the impact of a large oil pressure, large-particle impurities which originally exceed the filtering capacity of the coarse filter element can pass through the coarse filter element again, and at this time, the coarse filter pressure difference suddenly decreases. Large-particle impurities passing through the coarse filtering filter element can be accumulated before the fine filtering filter element, so that the fine filtering filter element is blocked, along with the increase of the blocking condition of the fine filtering filter element, the fuel quantity passing through the filter is reduced, the pressure in the fuel system is reduced, the fuel supply is insufficient, even the torque-limiting strategy is started under the serious condition, the fine filtering filter element is caused to lose efficacy, impurities enter the fuel injection system, and finally the whole fuel system is caused to break down.
Along with the continuous blockage of the coarse filtration filter element, the coarse filtration filter element passes through the coarse filtration filter element under high oil pressure, and the coarse filtration filter element can be failed due to the circulation. After the coarse filtration filter element fails, the blocking condition of the fine filtration filter element is increased, and the fine filtration filter element slowly fails.
In order to find out that the coarse filter element fails in time, avoid the fine filter element from failing and reduce the possibility of the fault of the fuel system, as shown in fig. 1, the embodiment provides a method for judging the failure of the coarse filter element of the filter, which comprises the following steps: monitoring rough filtration pressure difference in N collection steps in a rough filtration filter element failure monitoring state, calculating rough filtration pressure difference change rate, monitoring pressure after fine filtration in M collection steps if the rough filtration pressure difference change rate is smaller than a rough filtration pressure difference change rate threshold value, and calculating pressure change rate after fine filtration, wherein N and M are positive integers; and if the pressure change rate after the fine filtration is smaller than the pressure change rate threshold value after the fine filtration, judging that the rough filtration filter element is invalid.
In this embodiment, the rough filtration pressure difference change rate threshold value is a critical value of the rough filtration pressure difference change rate when the rough filtration filter element is in a blocked state to a non-blocked state. In this embodiment, in the state of monitoring failure of the coarse filter element, i.e., the coarse filter element is blocked and is under high pressure oil, the coarse filter element may pass through larger particles of impurities under high pressure oil, which may cause failure of the coarse filter element. When the rough filtration pressure difference change rate is smaller than the rough filtration pressure difference change rate threshold value, the situation shows that impurities blocked in front of the rough filtration filter element pass through the rough filtration filter element, so that the rough filtration pressure difference is suddenly reduced, the rough filtration filter element possibly fails, and then the pressure change rate after fine filtration is continuously judged to determine whether the rough filtration filter element really fails.
Optionally, the coarse filtration pressure difference change rate threshold is calibrated according to the rotating speed of the engine, the rotating speed of the engine is different, and the coarse filtration pressure difference change rate threshold is also different. The method comprises the steps of acquiring a corresponding table of the rotating speed of the engine and a rough filtration differential pressure change rate threshold value through actually acquiring corresponding data of the rotating speed of the engine and the rough filtration differential pressure change rate threshold value, acquiring the rotating speed of the engine in the current state when the rough filtration differential pressure change rate threshold value is determined, and finding out the rough filtration differential pressure change rate threshold value corresponding to the rotating speed of the current engine from the corresponding table.
In this embodiment, the threshold of the pressure change rate after fine filtration refers to a critical value of the pressure change rate after fine filtration from the non-blocking state to the blocking state of the fine filtration filter element. In the state that the rough filtering filter element is blocked, impurities are blocked before the rough filtering filter element and cannot enter the fine filtering filter element, and the fine filtering filter element is in the non-blocking state at the moment. When the rough filtration pressure difference suddenly decreases, namely the rough filtration pressure difference change rate is smaller than the rough filtration pressure difference change rate threshold value, it is indicated that the larger-particle impurities pass through the rough filtration filter element under the impact of high oil pressure, the larger-particle impurities after passing through the rough filtration filter element cannot pass through the fine filtration filter element and are accumulated before the fine filtration filter element, so that the fine filtration filter element is blocked, after the fine filtration filter element is blocked, the pressure change rate after fine filtration is smaller than the pressure change rate threshold value after fine filtration, so that the fine filtration filter element is blocked, namely the impurity particles reaching the fine filtration filter element are larger than the impurity particles which can be filtered by the fine filtration filter element, namely the impurity particles which do not filter the larger particles by the rough filtration filter element are not filtered, and the rough filtration filter element is judged to be invalid.
Optionally, the pressure change rate threshold after fine filtration is calibrated by fuel oil temperature, the fuel oil temperature is different, and the pressure change rate threshold after fine filtration is also different. It can be understood that the higher the fuel temperature is, the more diluted the fuel is, the easier the fuel passes through the filter element; the lower the fuel temperature, the more viscous the fuel and the less likely it will pass through the filter element. The pressure of thinner fuel oil after passing through the fine filter element is lower than that of viscous fuel oil after passing through the fine filter element, so that the fuel oil temperature is different, and the pressure change rate threshold value is different after passing through the fine filter. The pressure change rate threshold value after fine filtration is found out through a corresponding table of the fuel oil temperature and the pressure change rate threshold value after fine filtration, and the corresponding table of the fuel oil temperature and the pressure change rate threshold value after fine filtration is also obtained by actually acquiring the corresponding value of the fuel oil temperature and the pressure change rate threshold value after fine filtration.
According to the method for judging the failure of the coarse filter element of the filter, when the coarse filter element is damaged or is positioned at the blocking edge and the rotating speed of the engine is high, the coarse filter element is considered to be possibly failed, and the state of monitoring the failure of the coarse filter element is entered. And under the condition of monitoring the failure of the rough filtering filter element, judging that the rough filtering filter element fails when the pressure difference change rate of the rough filtering filter element is smaller than the rough filtering pressure difference change rate threshold value and the pressure change rate after the fine filtering is smaller than the pressure change rate threshold value after the fine filtering. The method for judging the failure of the coarse filter element of the filter provided by the embodiment can assist a user to find and replace the failed coarse filter element in time, and further damage to the fine filter element is avoided; early faults are found in time, maintenance cost is reduced, and the possibility of fault occurrence of a fuel system is reduced.
Optionally, in a coarse filtration filter element failure monitoring state, before the step of monitoring the coarse filtration pressure difference in N acquisition steps, the method further includes the following steps: and judging whether the state enters a coarse filtration filter element failure monitoring state. Only when the rough filtering filter element is in a blocking state and the engine speed is high, and the fuel pressure is high, large oil pressure can possibly enable large particle impurities which are blocked in front of the rough filtering filter element and exceed the filtering capacity of the rough filtering filter element to pass through the rough filtering filter element. Large particle impurities that exceed the filtration capacity of the coarse filter element can enlarge the mesh of the coarse filter element, resulting in failure of the coarse filter element. This is a prerequisite for monitoring the rate of change of the coarse filtration pressure difference.
Optionally, the method for determining whether to enter a coarse filtration filter element failure monitoring state includes: monitoring rough filtration pressure difference and engine speed within set time, judging whether the average value of the rough filtration pressure difference within the set time is greater than a high-pressure failure pressure difference threshold value or not, and whether the engine speed is greater than a high-pressure failure speed threshold value or not, and entering a rough filtration filter element failure monitoring state if the average value of the rough filtration pressure difference and the engine speed are both met; if either one of the two is not satisfied, the monitoring is continued.
And judging whether the coarse filtration filter element is blocked or not under the condition that the average value of the coarse filtration pressure difference in the set time is greater than the high-pressure failure pressure difference threshold value. And judging that the fuel pressure is enough to enable impurities blocked in front of the coarse filtering filter element to pass through the coarse filtering filter element if the engine rotating speed is greater than the high-pressure failure rotating speed threshold value. It should be noted that, the setting time is not specifically limited in this embodiment, and those skilled in the art can set the setting time according to actual situations.
In this embodiment, the high pressure failure pressure difference threshold is a pressure difference threshold value from a non-blocking state to a blocking state of the coarse filter element. The high-pressure failure rotating speed threshold value is the rotating speed threshold value of the engine when the rough filtering filter element is in a blockage state to a non-blockage state. When the rough filtration pressure difference is greater than the high-pressure failure pressure difference threshold value within the set time, impurities blocked in the rough filtration filter element may flush out the rough filtration filter element under high oil pressure, and the rough filtration filter element may fail.
Optionally, if the coarse filtration differential pressure change rate is greater than or equal to the coarse filtration differential pressure change rate threshold, continuing to determine whether to enter a coarse filtration filter element failure monitoring state. When the rough filtration differential pressure change rate is greater than or equal to the rough filtration differential pressure change rate threshold value, the rough filtration filter element is still in a blocking state, large particle impurities do not penetrate through the rough filtration filter element, and the rough filtration filter element cannot be caused to fail. At this time, whether the average value of the rough filtration pressure difference in the set time is larger than the high-pressure failure pressure difference threshold value or not and whether the engine rotating speed is larger than the high-pressure failure rotating speed threshold value or not need to be continuously monitored so as to judge whether the rough filtration filter element failure monitoring state is entered or not.
Optionally, if the pressure change rate after fine filtration is greater than or equal to the pressure change rate threshold after fine filtration, continuing to judge whether to enter the step of the coarse filtration filter element failure monitoring state. When the pressure change rate after the fine filtration is greater than or equal to the pressure change rate threshold after the fine filtration, the fine filtration filter element is not blocked, and the impurities passing through the coarse filtration filter element can be filtered by the fine filtration filter element, so that the coarse filtration filter element is not invalid. Under the condition, whether the average value of the rough filtration pressure difference in the set time is larger than the high-pressure failure pressure difference threshold value or not and whether the engine rotating speed is larger than the high-pressure failure rotating speed threshold value or not are continuously monitored so as to judge whether the rough filtration filter element failure monitoring state is entered or not.
Optionally, after the step of determining that the coarse filter element is failed, a coarse filter element failure alert is sent to the user.
The embodiment also provides a device for judging the failure of the coarse filter element of the filter, which is applied to the method for judging the failure of the coarse filter element of the filter. The method for judging the failure of the coarse filter element of the filter is realized by a controller, an engine, an oil temperature sensor, a differential pressure sensor and a pressure sensor are all electrically connected with the controller, a high-pressure failure differential pressure threshold value, a high-pressure failure rotating speed threshold value, a corresponding table of the rotating speed of the engine and a coarse filter differential pressure change rate threshold value, a corresponding table of a fuel oil temperature and a fine filter pressure change rate threshold value and a setting program for judging the failure method of the coarse filter element of the filter are stored in the controller, the oil temperature sensor, the differential pressure sensor and the pressure sensor send signals to the controller, the controller judges according to the received signals and the setting program for judging the failure method of the coarse filter element of the filter, and finally sends a judgment result to a human-computer interaction interface. A user can overhaul the fuel oil rough filtering filter element according to the prompt, and feeds back the oil rough filtering filter element to the controller through overhauled and confirmed option operation, when the selection is confirmed, the prompt disappears, and the controller continues to monitor; when the overhauled is selected, overhaul contents are filled and stored. It should be noted that, connection manners of the engine, the oil temperature sensor, the differential pressure sensor, and the pressure sensor electrically connected to the controller and the operation principle of the controller are already the prior art, and are not described herein again.
As shown in fig. 2, the method for determining failure of a coarse filtration filter element of a filter provided in this embodiment includes the following steps:
and S10, starting the engine.
S20, rough filtration pressure difference and engine speed within set time are monitored, and whether the average value of rough filtration pressure difference within set time is larger than a high-pressure failure pressure difference threshold value and whether the engine speed is larger than a high-pressure failure speed threshold value are judged.
And S30, judging whether the state enters a failure monitoring state of the coarse filtration filter element.
If the rough filtration pressure difference is greater than the high-pressure failure pressure difference threshold value within the set time and the engine rotating speed is greater than the high-pressure failure rotating speed threshold value, entering a rough filtration filter element failure monitoring state, and executing S40;
if either of the two is not satisfied, S20 is executed.
S40, monitoring the rough filtration pressure difference in the N acquisition step sizes, calculating the rough filtration pressure difference change rate, and judging whether the rough filtration pressure difference change rate is smaller than a rough filtration pressure difference change rate threshold value or not; if yes, go to S50; if not, S20 is executed.
S50, monitoring the pressure after fine filtration in the N acquisition step lengths, calculating the pressure change rate after fine filtration, and judging whether the pressure change rate after fine filtration is smaller than the pressure change rate threshold after fine filtration; if so, the coarse filtration filter element is invalid, and S60 is executed; if not, S20 is executed.
And S60, sending a rough filtration filter element failure prompt to a user.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A method for judging failure of a coarse filtration filter element of a filter is characterized by comprising the following steps:
monitoring rough filtration pressure difference in N collection steps in a rough filtration filter element failure monitoring state, calculating rough filtration pressure difference change rate, monitoring pressure after fine filtration in M collection steps if the rough filtration pressure difference change rate is smaller than a rough filtration pressure difference change rate threshold value, and calculating pressure change rate after fine filtration, wherein N and M are positive integers;
and if the pressure change rate after the fine filtration is smaller than the pressure change rate threshold after the fine filtration, judging that the rough filtration filter element is invalid.
2. The method for determining filter coarse filter element failure according to claim 1, wherein, before the step of monitoring coarse filter pressure difference in N acquisition steps in the coarse filter element failure monitoring state, the method further comprises the following steps:
and judging whether the coarse filtration filter element enters a failure monitoring state or not.
3. A method of determining filter coarse filter element failure according to claim 2, wherein the method of determining whether to enter the coarse filter element failure monitoring state comprises: monitoring rough filtration pressure difference and engine speed within set time, judging whether the average value of the rough filtration pressure difference within the set time is greater than a high-pressure failure pressure difference threshold value or not, and whether the engine speed is greater than a high-pressure failure speed threshold value or not, and entering a rough filtration filter element failure monitoring state if the average value of the rough filtration pressure difference and the engine speed are both met; if either one of the two is not satisfied, the monitoring is continued.
4. The method of determining a failure of a filter strainer according to claim 2, further comprising: and if the rough filtration differential pressure change rate is greater than or equal to the rough filtration differential pressure change rate threshold value, continuing the step of judging whether to enter a rough filtration filter element failure monitoring state.
5. The method of determining a failure of a filter strainer according to claim 2, further comprising: and if the pressure change rate after the fine filtration is greater than or equal to the pressure change rate threshold after the fine filtration, continuing the step of judging whether to enter the coarse filtration filter element failure monitoring state.
6. The method of claim 1, wherein the coarse filtration pressure difference change rate threshold is calibrated according to engine speeds, the engine speeds are different, and the coarse filtration pressure difference change rate threshold is different.
7. The method of claim 1, wherein the post-fine filtration pressure change rate threshold is calibrated based on fuel oil temperature, the fuel oil temperature being different, and the post-fine filtration pressure change rate threshold being different.
8. The method of claim 1, further comprising the step of, after the step of determining a failure of a coarse filter element: and sending the rough filtering filter element failure prompt to a user.
9. A device for judging the failure of a rough filter element of a filter, which is applied to the method for judging the failure of the rough filter element of the filter as claimed in any one of claims 1 to 8, and is characterized by comprising a pressure difference sensor and a pressure sensor, wherein the pressure difference sensor is used for detecting the rough filter pressure difference, and the pressure sensor is used for detecting the pressure after fine filtration.
10. The apparatus of claim 9, further comprising an oil temperature sensor for detecting the temperature of the fuel in the fuel system.
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| CN207554242U (en) * | 2017-08-29 | 2018-06-29 | 潍柴重机股份有限公司 | Diesel fuel filter pressure protection and the device of resistance instruction |
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