CN113236456A - Method, device and equipment for detecting running state of filter and storage medium - Google Patents
Method, device and equipment for detecting running state of filter and storage medium Download PDFInfo
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- CN113236456A CN113236456A CN202110675828.7A CN202110675828A CN113236456A CN 113236456 A CN113236456 A CN 113236456A CN 202110675828 A CN202110675828 A CN 202110675828A CN 113236456 A CN113236456 A CN 113236456A
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/03—Mounting or connecting of lubricant purifying means relative to the machine or engine; Details of lubricant purifying means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/10—Indicating devices; Other safety devices
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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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/02—Air cleaners
- F02M35/08—Air cleaners with means for removing dust, particles or liquids from cleaners; with means for indicating clogging; with by-pass means; Regeneration of cleaners
- F02M35/09—Clogging indicators ; Diagnosis or testing of air cleaners
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The embodiment of the application discloses a method, a device, equipment and a storage medium for detecting the running state of a filter, the method is applied to an engine, the engine comprises a plurality of filter groups, each filter group comprises a plurality of filters and at least one pressure difference sensor, the effective running time of each filter is within a first preset time range, the number of the pressure difference sensors is less than that of the filters, and the method comprises the following steps: acquiring a differential pressure value measured by at least one differential pressure sensor in the group; determining whether each pressure difference value can represent the pressure difference of the filter or not according to each pressure difference value; if the detected pressure difference value cannot represent the pressure difference of any filter, determining the operation time of the filter group; and if the operation time of the filter reaches a second preset time, determining that the operation state of the filter group is abnormal. The utilization rate of each filter is improved under the condition of ensuring the normal operation of each filter.
Description
Technical Field
The application relates to the technical field of engines, in particular to a method, a device, equipment and a storage medium for detecting the running state of a filter.
Background
The filter is a filter that filters impurities or gas through filter paper. Generally, the automobile filter is an accessory of an engine and is divided into the following parts according to different filtering functions: oil filters, fuel filters (gasoline filters, diesel filters, oil-water separators, hydraulic filters), air filters, air-conditioning filters, and the like. The air filter, the engine oil filter, the fuel oil filter and the air-conditioning filter are respectively used for filtering a medium in the lubricating system and the combustion system, a motor air inlet system and a carriage air circulating system.
At present, a regular maintenance mode is adopted by various main engine plants and engine manufacturers of an air filter, a fuel filter, an oil filter and engine oil of a diesel engine, for example, the maintenance period is 10 kilometers, and when the maintenance period reaches 10 kilometers, a user needs to go to a station to replace the filter and the engine oil.
In actual operation, because the vehicle types, the vehicle operation conditions, the operation areas and the oil consumption of the whole vehicle matched with the same engine are different, and are influenced by the actual fuel oil filling quality and the engine oil quality, the maintenance period of the filter does not reach the actual service life in the specified maintenance mileage, and a large margin may be provided in advance. If the engine reaches in advance, the faults of engine aftertreatment blockage, insufficient power, flameout, fuel injector part damage, early engine abrasion and the like can be caused. If a large margin is left, the filter element is replaced, the waste of the function of the filter element is caused, and the shutdown time and the maintenance cost of a user are increased.
Disclosure of Invention
The embodiment of the application provides a method, a device, equipment and a storage medium for detecting the running state of a filter, which are used for improving the utilization rate of each filter under the condition of ensuring the normal running of each filter.
In a first aspect, an embodiment of the present application provides a method for detecting an operating state of a filter, the method being applied to an engine, the engine including a plurality of filter groups, wherein each filter group includes a plurality of filters and at least one differential pressure sensor, an effective operating time period of each filter is within a first preset time period range, and a number of the differential pressure sensors is smaller than the number of the filters, the method including:
acquiring a differential pressure value measured by at least one differential pressure sensor in the group;
determining whether each of the pressure differential values is indicative of a pressure differential across the filter based on each of the pressure differential values;
if the detected pressure difference value cannot represent the pressure difference of any one filter, determining the operation time of the filter group;
and if the operation time of the filter reaches a second preset time, determining that the operation state of the filter group is abnormal.
In the embodiment of the application, because the effective operation time of each filter in the same filter group is within the first preset time range, the pressure difference sensors with the number less than that of the filters can be used for detection; and aiming at each filter group, when the detected differential pressure value cannot represent the differential pressure of any filter, determining the operation state of the filter group without using the differential pressure, and determining the operation time of the filter group when the operation time reaches a second preset time. Different filter element fault judgment logics are adopted according to actual operation conditions, and compared with the application of unified judgment logics in the prior art, on one hand, the performance of each filter is fully utilized, and on the other hand, the normal operation of each filter is also ensured; the convenience of filter maintenance and maintenance is improved.
In some exemplary embodiments, determining whether each differential pressure value is indicative of the differential pressure across the filter is performed by:
if the differential pressure change rate of each differential pressure sensor in a preset period is positive, determining that each differential pressure value can represent the differential pressure of a filter bound with the differential pressure sensor corresponding to the differential pressure value;
if the differential pressure change rate of a part of differential pressure sensors in a preset period is positive and the differential pressure change rate of a part of differential pressure sensors is negative, determining that the differential pressure of the filter bound by the differential pressure sensor with the negative change rate is represented by the differential pressure value of any differential pressure sensor with the positive change rate and the filter bound by the differential pressure sensor with the positive change rate;
and if the differential pressure change rate of each differential pressure sensor in the preset period is negative, determining that each differential pressure value cannot represent the differential pressure of any filter.
In the embodiment, whether each differential pressure value can represent the differential pressure of each filter is determined by the positive and negative of the differential pressure change rate of each differential pressure sensor in the preset period. Therefore, when the filter element fault is judged subsequently, whether the judgment is carried out by using the preset pressure difference threshold or the preset time length can be accurately determined. The accuracy of filter core fault diagnosis is improved.
In some exemplary embodiments, after determining whether each of the pressure difference values is indicative of the pressure difference across the filter based on each of the pressure difference values, the method further comprises:
and if the detected pressure difference value represents the pressure difference of each filter, judging whether the pressure difference value reaches a preset pressure difference threshold, and if so, determining that the filter element of the filter bound by the pressure difference sensor corresponding to the pressure difference value reaching the preset pressure difference threshold fails.
In the embodiment, when the detected differential pressure value can represent the differential pressure of each filter, the operation of each filter is normal, and at the moment, the filter element fault of the filter bound by the differential pressure sensor corresponding to the differential pressure value reaching the preset differential pressure threshold is determined by directly applying the relation between the differential pressure value and the preset differential pressure threshold. In this scenario, the performance of each filter can be fully utilized by performing the determination with the preset differential pressure threshold.
In some exemplary embodiments, if the differential pressure change rate of a partial differential pressure sensor is positive and the differential pressure change rate of a partial differential pressure sensor is negative in a preset period, after determining that the differential pressure of the filter bound by the differential pressure sensor with the negative change rate is characterized by the differential pressure value of any differential pressure sensor with the positive change rate, the method further includes:
and judging whether the determined pressure difference value representing the filter reaches a preset pressure difference threshold value, and if so, determining that the operation state of the filter group is abnormal.
In the above embodiment, if the differential pressure value with the positive differential pressure change rate (the filter which operates normally) and the differential pressure value with the negative differential pressure change rate (the filter which has a fault and needs to replace the filter element) are used, the positive differential pressure value which can represent the differential pressure of the filter is compared with the preset differential pressure threshold, and the abnormal operation state of the filter group is determined when the preset differential pressure threshold is reached. Therefore, the problem of inaccurate filter element fault judgment caused by the fact that the differential pressure of the filter with the filter element replaced is used for representing the differential pressure of the filter without the filter element replaced can be avoided.
In some exemplary embodiments, before obtaining the differential pressure value measured by at least one differential pressure sensor in the group, the method further includes:
determining that a speed of the engine is greater than or equal to an idle speed.
According to the embodiment, the pressure difference sensor is started to perform pressure difference detection when the rotating speed of the engine is greater than or equal to the idling rotating speed, the load of the pressure difference sensor is reduced, and the running state of the filter judged under the idling working condition is more accurate.
In a second aspect, an embodiment of the present application provides a device for detecting an operating state of a filter, the device is integrated in an engine, the engine includes a plurality of filter groups, each filter group includes a plurality of filters and at least one differential pressure sensor, an effective operating time period of each filter is within a first preset time period range, the number of differential pressure sensors is less than the number of filters, and the device includes:
the data acquisition module is used for acquiring a differential pressure value measured by at least one differential pressure sensor in the group;
a first determining module for determining whether each of the pressure differential values is indicative of a pressure differential across the filter based on each of the pressure differential values;
the second determining module is used for determining the operation time of the filter group when the detected differential pressure value cannot represent the differential pressure of any one filter;
and the third determining module is used for determining that the operation state of the filter group is abnormal when the operation time of the filter reaches a second preset time.
In some exemplary embodiments, the first determination module is specifically configured to determine whether each pressure differential value is indicative of a pressure differential across the filter by:
if the differential pressure change rate of each differential pressure sensor in a preset period is positive, determining that each differential pressure value can represent the differential pressure of a filter bound with the differential pressure sensor corresponding to the differential pressure value;
if the differential pressure change rate of a part of differential pressure sensors in a preset period is positive and the differential pressure change rate of a part of differential pressure sensors is negative, determining that the differential pressure of the filter bound by the differential pressure sensor with the negative change rate is represented by the differential pressure value of any differential pressure sensor with the positive change rate and the filter bound by the differential pressure sensor with the positive change rate;
and if the differential pressure change rate of each differential pressure sensor in the preset period is negative, determining that each differential pressure value cannot represent the differential pressure of any filter.
In some exemplary embodiments, the filter further includes a fourth determining module, configured to, after determining whether each pressure difference value can represent the pressure difference of the filter according to each pressure difference value, if the detected pressure difference value represents the pressure difference of each filter, determine whether the pressure difference value reaches a preset pressure difference threshold, and if so, determine that a filter element of the filter bound by the pressure difference sensor corresponding to the pressure difference value reaching the preset pressure difference threshold fails.
In some exemplary embodiments, the filter pack further includes a fifth determining module, configured to determine, after a pressure difference value of any one of the pressure difference sensors with a positive change rate is used to represent a pressure difference of a filter bound by the pressure difference sensor with a negative change rate, whether the determined pressure difference value representing the filter reaches a preset pressure difference threshold value, and if so, determine that an operation state of the filter pack is abnormal.
In some exemplary embodiments, the engine further comprises a sixth determining module for determining that the engine speed is greater than or equal to the idle speed before obtaining the differential pressure value measured by at least one differential pressure sensor in the group.
In a third aspect, an embodiment of the present application provides an apparatus, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of any one of the methods when executing the computer program.
In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having stored thereon computer program instructions, which, when executed by a processor, implement the steps of any of the methods described above.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic application scenario diagram of a method for detecting an operating state of a filter according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating an application scenario of another method for detecting an operating state of a filter according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart illustrating a method for detecting an operating condition of a filter according to an embodiment of the present disclosure;
FIG. 4 is a schematic flow chart illustrating a method for detecting an operating condition of a filter using a differential pressure sensor according to an exemplary embodiment of the present disclosure;
FIG. 5 is a schematic flow chart illustrating a method for detecting an operating condition of a filter using two differential pressure sensors according to an embodiment of the present disclosure;
FIG. 6 is a schematic structural diagram of a device for detecting an operating condition of a filter according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of an apparatus according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
For convenience of understanding, terms referred to in the embodiments of the present application are explained below:
idling: idle speed is not a speed but refers to an operating condition; when the engine is idling, the engine is called idling; that is, when the engine is running, if the accelerator pedal is completely released, the engine is in an idle state; the speed at which the engine idles is referred to as an idle speed.
Any number of elements in the drawings are by way of example and not by way of limitation, and any nomenclature is used solely for differentiation and not by way of limitation.
In a specific practical process, at present, regular maintenance modes are adopted by various main engine plants and engine manufacturers of diesel engines such as air filters, fuel filters, oil filters and engine oil, for example, the maintenance period is 10 kilometers, and when the maintenance period reaches 10 kilometers, a user needs to go to a station to replace the filters and/or the engine oil.
In actual operation, because the vehicle types, the vehicle operation conditions, the operation areas and the oil consumption of the whole vehicle matched with the same engine are different, and are influenced by the actual fuel oil filling quality and the engine oil quality, the maintenance period of the filter does not reach the actual service life in the specified maintenance mileage, and a large margin may be provided in advance. If the engine reaches in advance, the faults of engine aftertreatment blockage, insufficient power, flameout, fuel injector part damage, early engine abrasion and the like can be caused. If a large margin is left, the filter element is replaced, the waste of the function of the filter element is caused, and the shutdown time and the maintenance cost of a user are increased.
To this end, the present application provides a method for detecting an operating state of a filter, the method being applied to an engine including a plurality of filter groups, each filter group including a plurality of filters and at least one differential pressure sensor, an effective operating period of each filter being within a first preset period, the number of differential pressure sensors being smaller than the number of filters, the method including: acquiring a differential pressure value measured by at least one differential pressure sensor in the group; determining whether each pressure difference value can represent the pressure difference of the filter or not according to each pressure difference value; if the detected pressure difference value cannot represent the pressure difference of any filter, determining the operation time of the filter group; and if the operation time of the filter reaches a second preset time, determining that the operation state of the filter group is abnormal. The utilization rate of each filter is improved under the condition of ensuring the normal operation of each filter.
After introducing the design concept of the embodiment of the present application, some simple descriptions are provided below for application scenarios to which the technical solution of the embodiment of the present application can be applied, and it should be noted that the application scenarios described below are only used for describing the embodiment of the present application and are not limited. In specific implementation, the technical scheme provided by the embodiment of the application can be flexibly applied according to actual needs.
The method for detecting the operating state of the filter in the embodiment of the present application is applied to an engine including a plurality of filter groups, and the method in the embodiment of the present application is applicable to each filter group. Each filter group comprises a plurality of filters and at least one differential pressure sensor, the effective operation time of each filter is within a first preset time range, and the number of the differential pressure sensors is smaller than that of the filters, so that the number of the differential pressure sensors can be saved, and the differential pressure sensors do not need to be arranged on each filter.
Referring to fig. 1, it is a schematic view of an application scenario of a method for detecting an operating state of a filter according to an embodiment of the present application.
Taking three filters (a fuel coarse filter, a fuel fine filter and an oil filter) as an example, the three filters are used as a filter group, and the effective operation time (service life) of the three filter groups is within a first preset time range (for example, the difference is less than 1 hour), that is, the service life is close to that of the three filter groups. Thus, in fig. 1, a differential pressure sensor is taken as an example, the differential pressure sensor may be disposed on any one of the filters (for example, on the fine fuel filter), the differential pressure value measured by the differential pressure sensor may represent the differential pressure of the fine fuel filter, and since the service life of each filter in the same group of filters is relatively close, the differential pressure value measured by the differential pressure sensor may also represent the differential pressure of other filters (the coarse fuel filter and the oil filter) in the group.
Referring to fig. 2, it is a schematic view of an application scenario of a method for detecting an operation state of a filter according to an embodiment of the present application.
Taking three filters (a fuel coarse filter, a fuel fine filter and an oil filter) as an example, the three filters serve as a filter group, and the effective operation time (service life) of the three filter groups is within a first preset time range (for example, the difference is less than 1 hour), that is, the service life is close to that of the three filter groups. Thus, in fig. 2, two differential pressure sensors are taken as an example, the two differential pressure sensors may be disposed on any two filters (for example, one disposed on the fuel fine filter and one disposed on the oil filter), and the differential pressure measured by any one differential pressure sensor represents the differential pressure of the third differential pressure sensor (the fuel coarse filter).
Of course, the method provided in the embodiment of the present application is not limited to be used in the application scenarios shown in fig. 1 and fig. 2, and may also be used in other possible application scenarios, and the embodiment of the present application is not limited. Functions that can be implemented by each device in the application scenarios shown in fig. 1 and fig. 2 will be described together in the following method embodiments, and will not be described in detail herein.
To further illustrate the technical solutions provided by the embodiments of the present application, the following detailed description is made with reference to the accompanying drawings and the detailed description. Although the embodiments of the present application provide method steps as shown in the following embodiments or figures, more or fewer steps may be included in the method based on conventional or non-inventive efforts. In steps where no necessary causal relationship exists logically, the order of execution of the steps is not limited to that provided by the embodiments of the present application.
The following describes the technical solution provided by the embodiment of the present application with reference to the application scenarios shown in fig. 1 and fig. 2.
Referring to fig. 3, an embodiment of the present application provides a method for detecting an operating state of a filter, including the following steps:
s301, obtaining a differential pressure value measured by at least one differential pressure sensor in the group.
And S302, determining whether each pressure difference value can represent the pressure difference of the filter or not according to each pressure difference value.
S303, if the detected differential pressure value cannot represent the differential pressure of any filter, determining the operation time of the filter group.
S304, if the operation time of the filter reaches a second preset time, determining that the operation state of the filter group is abnormal.
In the embodiment of the application, because the effective operation time of each filter in the same filter group is within the first preset time range, the pressure difference sensors with the number less than that of the filters can be used for detection; and aiming at each filter group, when the detected differential pressure value cannot represent the differential pressure of any filter, determining the operation state of the filter group without using the differential pressure, and determining the operation time of the filter group when the operation time reaches a second preset time. Different filter element fault judgment logics are adopted according to actual operation conditions, and compared with the application of unified judgment logics in the prior art, on one hand, the performance of each filter is fully utilized, and on the other hand, the normal operation of each filter is also ensured; the convenience of filter maintenance and maintenance is improved.
Referring to S301, the filter is prone to malfunction only when the rotation speed of the engine is greater than or equal to the idle rotation speed, that is, the filter is prone to malfunction only when the rotation speed of the engine is greater than or equal to the idle rotation speed, and the filter is generally not prone to malfunction if the rotation speed of the engine is less than the idle rotation speed. Therefore, when it is determined that the engine speed is equal to or higher than the idle speed in order to reduce the processing load and increase the processing speed, the pressure difference sensors are opened to detect the pressure difference in the filter.
Illustratively, since each filter group includes filters that are effective for operating for a period of time within a first predetermined period of time, indicating that the respective filters are approaching or equal in life, the other filters may also reach life when one of the filters reaches life within the same filter group.
The service lives of the filters in different groups have no obvious relationship, and the differential pressure measured by at least one differential pressure sensor in the group is obtained for each group of filters. In a specific example, taking fig. 1 and 2 as an example, for example, in fig. 1, there is a differential pressure sensor which can be disposed on any one of the filters, so that the differential pressure value measured by the differential pressure sensor indicates the differential pressure value of each filter. For example, in fig. 2, there are two differential pressure sensors, which may be disposed on any two filters, may be disposed according to the type of filter (one on the oil filter and one on the fuel filter, for example, one on the fuel fine filter, optionally), or may be disposed according to the importance of the filter to the engine. In fig. 2, two differential pressure sensors are provided on the oil filter and the fuel fine filter, for example, in which case the differential pressure of the fuel fine filter may also be indicative of the differential pressure of the fuel coarse filter.
Referring to S302, since a differential pressure sensor is not provided on each filter in order to save the number of differential pressure sensors, that is, there is not a directly measured differential pressure value for each filter. Thus, to determine whether each filter of the filter stack is malfunctioning, it is determined from the measured pressure differential values whether each pressure differential value is indicative of a pressure differential across the filter.
Specifically, it is determined whether each differential pressure value is indicative of the differential pressure across the filter by:
in the first case, if the differential pressure change rate of each differential pressure sensor in the preset period is positive, it is determined that each differential pressure value can represent the differential pressure of the filter bound by the differential pressure sensor corresponding to the differential pressure value.
The preset period may be 5 minutes, the first time is t, and the second time is t +5, and the differential pressure change rate is a quotient of a difference value between the differential pressure measured at the time t +5 and the differential pressure measured at the time t and 5. The change rate is positive, namely the pressure difference measured at the moment t +5 is greater than the pressure difference measured at the moment t, and when the pressure difference is in a rising trend in the preset period, the normal work of each filter is indicated. At the moment, each detected pressure difference value can represent the pressure difference of the filter bound by the pressure difference sensor corresponding to the pressure difference value. Taking fig. 1 and 2 as an example, in fig. 1, the differential pressures obtained by the differential pressure sensor 0 at different times are represented as P01, P02, P03, P04, P05, P06 … … P0m, where m represents the mth time. In fig. 2, the differential pressures obtained by the differential pressure sensor 1 at different times are denoted as P11, P12, P13, P14, P15, and P16...... P1n, where n denotes the nth time; the differential pressures obtained by the differential pressure sensor 2 are denoted as P21, P22, P23, P24, P25, and P26. Thus, the differential pressure obtained by the differential pressure sensor 1 can represent the differential pressure of the fuel coarse filter and the fuel fine filter, and the differential pressure obtained by the differential pressure sensor 2 can represent the differential pressure of the oil filter.
In this case, as the filter operates, its differential pressure may become greater and greater, and its service life may not be reached, but the filter may also malfunction when the differential pressure value increases to a preset differential pressure threshold (a service life differential pressure according to a theoretical design). Therefore, whether the pressure difference value reaches the preset pressure difference threshold value or not is directly judged, and if yes, the filter element fault of the filter bound by the pressure difference sensor corresponding to the pressure difference value reaching the preset pressure difference threshold value is determined. In this case, the predetermined pressure difference threshold may be determined according to the actual operation condition of each filter, and the filter may not normally operate if the predetermined pressure difference threshold is exceeded. Still taking the above fig. 1 and fig. 2 as an example, in fig. 1, if the obtained P0m at the present time reaches the preset differential pressure threshold P, it indicates that the fuel fine filter is faulty, and since only one differential pressure sensor is arranged in the group of filters and the service lives of the three filters are close, it is determined that the fuel coarse filter and the oil filter may also reach the service lives at this time, a dashboard or an alarm lamp may flash to prompt a user, and the user may select to replace only the filter element of the fuel fine filter or replace the filter element of the fuel coarse filter or the oil of the oil filter together according to the actual needs, and the advantage of replacing only the filter element is that the fuel coarse filter and the oil filter can be utilized to a greater extent, and at worst, the subsequent differential pressure detection is inaccurate; the advantage of changing together is that can be as few as possible take apart the engine, protect the engine, the bad place is that fuel coarse strainer and oil cleaner probably not reach life yet, and the utilization ratio is lower.
In the second case, if the differential pressure change rate of the partial differential pressure sensor in the preset period is positive and the differential pressure change rate of the partial differential pressure sensor is negative, the differential pressure of the filter bound by the differential pressure sensor with the negative change rate and the filter bound by the differential pressure sensor with the positive change rate are represented by the differential pressure value of any differential pressure sensor with the positive change rate.
Taking fig. 2 as an example, in the selected preset period, the differential pressure change rate V2 of the differential pressure sensor 2 is positive, which indicates that the filter (oil filter) bound by the differential pressure sensor 2 operates normally; the differential pressure change rate V1 of the differential pressure sensor 1 is negative, which indicates that the filter (fuel fine filter) bound by the differential pressure sensor 1 has a fault in operation, the operation condition of the fuel coarse filter is unknown, and at this time, a user can be prompted to replace the filter element of the fuel fine filter by the flickering of an instrument panel or an alarm lamp. At this time, the differential pressure sensor 1 and the differential pressure sensor 2 continue to perform differential pressure detection, and it may happen that the operation time of the fuel fine filter after the filter element is replaced is longer than that of the fuel coarse filter without the filter element being replaced, and the differential pressure detected by the differential pressure sensor 1 cannot represent the differential pressure of the fuel fine filter, so that although the differential pressure of each filter can be continuously detected by each differential pressure sensor, the differential pressure of the filter after the filter element is replaced has little meaning for judging whether the filter element needs to be replaced, at this time, the differential pressure of the differential pressure sensor with the positive change rate is used for representing the differential pressure of the differential pressure sensor with the negative change rate, and whether the filter fails is judged by using the differential pressure.
In this case, it is determined whether the determined differential pressure value indicative of the filter reaches a preset differential pressure threshold value, and if so, it is determined that the operating state of the filter group is abnormal. Also as an example in fig. 2, after the filter element of the fine fuel filter is replaced, the differential pressure measured by the differential pressure sensor 2 is compared with a preset differential pressure threshold value to determine whether the operation state of the filter group is abnormal. In this example, if the differential pressure of the differential pressure sensor 1 reaches the preset differential pressure threshold, it is determined that the oil filter is faulty, and the filter element of the fuel fine filter has been replaced, but the operating condition of the fuel coarse filter is unknown, and at this time, the user may be prompted to replace the filter element or the engine oil by blinking of an instrument panel or an alarm lamp, and the user may select to replace only the faulty filter element or replace all the filter elements together according to actual needs.
And in the third situation, if the differential pressure change rate of each differential pressure sensor in the preset period is negative, determining that each differential pressure value cannot represent the differential pressure of any filter.
Because the pressure difference change rate of each pressure difference sensor is negative within the preset time, which indicates that the filter element of the filter bound with the pressure difference sensor is in fault, the detected pressure difference value cannot represent the pressure difference of any filter, namely, the relation between the pressure difference and the preset pressure difference threshold value cannot be used for judging whether the filter is in fault or not.
In this case, the operating time of the filter stack is determined, as related to S303, if the detected differential pressure value is not indicative of the differential pressure of any one of the filters.
At this time, the operating time of the respective filter group is determined, which may include two parts, the operating time T1 before the filter cartridge replacement and the operating time T2 after the filter cartridge replacement, and then the operating time T is T1+ T2, that is, the operating time of the filter group.
Referring to S304, if the operating time period of the filter reaches the second preset time period, it is determined that the operating state of the filter group is abnormal.
If the operation time of the filter reaches a second preset time (maintenance period of theoretical design), the abnormal operation state of the filter group can be determined, and a user can select to replace part of filter elements or all the filter elements according to actual conditions. In a specific example, if the lives (effective operating periods) of the respective filters are the same, the second preset period may refer to the effective operating period; if the respective filter lives are different, the second preset period of time may be an average of the respective lives.
In order to make the technical solution of the present application easier to understand, three filters and one differential pressure sensor, and three filters and two differential pressure sensors are explained. FIG. 4 is a schematic flow chart diagram illustrating a method of detecting an operating condition of a filter; fig. 5 shows a schematic flow diagram of a method for detecting an operating state of a filter.
Referring to fig. 4, the differential pressure sensor 0 is disposed on the fuel fine filter, and when the engine speed is greater than or equal to the idle speed (when the engine speed is less than the idle speed, an ECU (Electronic Control Unit) does not read differential pressure data), it is determined whether a differential pressure change rate in a preset period is greater than zero, if so, when the pressure continues to increase, it is determined whether the detected differential pressure reaches a preset differential pressure threshold, and if so, an instrument panel or an alarm lamp flashes to prompt a user to replace the filter element and/or the engine oil. If the pressure difference change rate in the preset period is smaller than zero, the filter element of the fuel fine filter is determined to be damaged, the ECU gives an alarm, a damaged part is judged, the instrument panel or the alarm lamp flickers, a user is prompted to replace the damaged filter element, and other filter elements continue to be used. The ECU records T1 of the running time, accumulates T2 of the running time of a new filter element, and when the sum of T1 and T2 reaches a damaged and fixed period (maintenance period of theoretical design), the ECU judges that the filter element needs to be replaced, at the moment, an instrument panel or an alarm lamp flickers to prompt a user to replace the damaged filter element, and the user can replace the fuel filter, the oil filter and engine oil together.
Referring to fig. 5, a differential pressure sensor 1 is disposed on a fuel fine filter, a differential pressure sensor 2 is disposed on a fuel coarse filter, when the engine speed is greater than or equal to the idle speed (when the engine speed is less than the idle speed, an ECU does not read differential pressure data), whether a differential pressure change rate in a preset period is greater than zero is determined for a differential pressure detected by each differential pressure sensor, if so, when the pressure continues to increase, whether the detected differential pressure reaches a preset differential pressure threshold is determined, and if the differential pressure of one differential pressure sensor reaches the preset differential pressure threshold or the differential pressures of two differential pressure sensors reach the preset differential pressure threshold, an instrument panel or an alarm lamp flashes to prompt a user to replace a filter element and/or engine oil.
If the differential pressure change rates of the two differential pressure sensors in the preset period are smaller than zero, the fact that the filter element of the fuel fine filter is damaged is determined, the ECU gives an alarm, the damaged part is judged, the instrument panel or the alarm lamp flickers, a user is prompted to replace the damaged filter element, and other filter elements continue to be used. The ECU records T1 of the running time, accumulates T2 of the running time of a new filter element, and when the sum of T1 and T2 reaches a damaged and fixed period (maintenance period of theoretical design), the ECU judges that the filter element needs to be replaced, at the moment, an instrument panel or an alarm lamp flickers to prompt a user to replace the damaged filter element, and the user can replace the fuel filter, the oil filter and engine oil together.
If one of the differential pressure change rates of the two differential pressure sensors (for example, the differential pressure of the differential pressure sensor 1) in the preset period is less than zero, after the instrument panel or the alarm lamp flickers to prompt a user to replace the filter element of the damaged filter element, the data of the differential pressure sensor 2 is used for comparing with a preset differential pressure threshold value to determine whether the filter element needs to be replaced. Similarly, if the differential pressure of the differential pressure sensor 2 is less than 0, after the instrument panel or the alarm lamp flickers to prompt the user to replace the filter element of the damaged filter element, the data of the differential pressure sensor 1 is used to compare with the preset differential pressure threshold value to determine whether the filter element needs to be replaced.
In the embodiment, the differential pressure sensor monitors in real time, and ECU calculation and analysis logic, an instrument panel or an alarm lamp of fewer differential pressure sensors are used for visual reminding; the installation cost is low, the flexible maintenance can be realized, and the user cost and the unplanned shutdown time are reduced; the engine is slightly changed, the elastic maintenance of the filter is realized, and the severe or abnormal working condition and malignant fault are avoided; the design capability of the filter is fully utilized, and the maintenance and operation cost of a user is reduced.
As shown in fig. 6, based on the same inventive concept as the method for detecting the operating state of the filter, the embodiment of the present application further provides a device for detecting the operating state of the filter, the device is integrated in an engine, the engine comprises a plurality of filter groups, each filter group comprises a plurality of filters and at least one differential pressure sensor, the effective operating time of each filter is within a first preset time range, the number of the differential pressure sensors is less than the number of the filters, and the device comprises a data acquisition module 61, a first determination module 62, a second determination module 63 and a third determination module 64.
The data acquisition module 61 is configured to acquire a differential pressure value measured by at least one differential pressure sensor in the group;
a first determination module 62 for determining whether each pressure differential value is indicative of a differential pressure across the filter based on each pressure differential value;
a second determining module 63, configured to determine an operation duration of the filter group when the detected differential pressure value cannot represent a differential pressure of any one of the filters;
the third determination module 64 is configured to determine that the operational state of the filter group is abnormal when the operational duration of the filter reaches a second predetermined duration.
In some exemplary embodiments, the first determination module 62 is specifically configured to determine whether each differential pressure value is indicative of a differential pressure across the filter by:
if the differential pressure change rate of each differential pressure sensor in the preset period is positive, determining that each differential pressure value can represent the differential pressure of the filter bound with the differential pressure sensor corresponding to the differential pressure value;
if the differential pressure change rate of a part of differential pressure sensors in a preset period is positive and the differential pressure change rate of a part of differential pressure sensors is negative, determining that the differential pressure of the filter bound by the differential pressure sensor with the negative change rate is represented by the differential pressure value of any differential pressure sensor with the positive change rate and the filter bound by the differential pressure sensor with the positive change rate;
and if the differential pressure change rate of each differential pressure sensor in the preset period is negative, determining that each differential pressure value cannot represent the differential pressure of any filter.
In some exemplary embodiments, the filter further includes a fourth determining module, configured to, after determining whether each pressure difference value can represent a pressure difference of the filter according to each pressure difference value, determine whether the pressure difference value reaches a preset pressure difference threshold if the detected pressure difference value represents the pressure difference of each filter, and if so, determine that a filter element of the filter bound by the pressure difference sensor corresponding to the pressure difference value reaching the preset pressure difference threshold fails.
In some exemplary embodiments, the filter pack further includes a fifth determining module, configured to determine, after a pressure difference value of any one of the pressure difference sensors with a positive change rate is used to represent a pressure difference of a filter bound by the pressure difference sensor with a negative change rate, whether the determined pressure difference value representing the filter reaches a preset pressure difference threshold value, and if so, determine that an operation state of the filter pack is abnormal.
In some exemplary embodiments, the engine speed determination module is further configured to determine that the engine speed is greater than or equal to an idle speed before obtaining the differential pressure value measured by the at least one differential pressure sensor in the group.
The detection device for the filter running state and the detection method for the filter running state provided by the embodiment of the application adopt the same inventive concept, can obtain the same beneficial effects, and are not repeated herein.
Based on the same inventive concept as the method for detecting the operating state of the filter, the embodiment of the present application further provides a device, which may be specifically (a control device or a control system inside the smart device, or an external device communicating with the smart device, for example) a desktop computer, a portable computer, a smart phone, a tablet computer, a Personal Digital Assistant (PDA), a server, or the like. As shown in fig. 7, the device may include a processor 701 and a memory 702.
The Processor 701 may be a general-purpose Processor, such as a Central Processing Unit (CPU), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present Application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; the computer storage media may be any available media or data storage device that can be accessed by a computer, including but not limited to: various media that can store program codes include a removable Memory device, a Random Access Memory (RAM), a magnetic Memory (e.g., a flexible disk, a hard disk, a magnetic tape, a magneto-optical disk (MO), etc.), an optical Memory (e.g., a CD, a DVD, a BD, an HVD, etc.), and a semiconductor Memory (e.g., a ROM, an EPROM, an EEPROM, a nonvolatile Memory (NAND FLASH), a Solid State Disk (SSD)).
Alternatively, the integrated units described above in the present application may be stored in a computer-readable storage medium if they are implemented in the form of software functional modules and sold or used as independent products. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially implemented or portions thereof that contribute to the prior art may be embodied in the form of a software product stored in a storage medium, and including several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods of the embodiments of the present application. And the aforementioned storage medium includes: various media that can store program codes include a removable Memory device, a Random Access Memory (RAM), a magnetic Memory (e.g., a flexible disk, a hard disk, a magnetic tape, a magneto-optical disk (MO), etc.), an optical Memory (e.g., a CD, a DVD, a BD, an HVD, etc.), and a semiconductor Memory (e.g., a ROM, an EPROM, an EEPROM, a nonvolatile Memory (NAND FLASH), a Solid State Disk (SSD)).
The above embodiments are only used to describe the technical solutions of the present application in detail, but the above embodiments are only used to help understanding the method of the embodiments of the present application, and should not be construed as limiting the embodiments of the present application. Modifications and substitutions that may be readily apparent to those skilled in the art are intended to be included within the scope of the embodiments of the present application.
Claims (10)
1. A method of detecting an operating condition of a filter, the method being applied to an engine including a plurality of filter groups, wherein each filter group includes a plurality of filters and at least one differential pressure sensor, an effective operating period of each filter is within a first preset period, and the number of differential pressure sensors is smaller than the number of filters, the method comprising:
acquiring a differential pressure value measured by at least one differential pressure sensor in the group;
determining whether each of the pressure differential values is indicative of a pressure differential across the filter based on each of the pressure differential values;
if the detected pressure difference value cannot represent the pressure difference of any one filter, determining the operation time of the filter group;
and if the operation time of the filter reaches a second preset time, determining that the operation state of the filter group is abnormal.
2. The method of claim 1, wherein determining whether each pressure differential value is indicative of the pressure differential across the filter is performed by:
if the differential pressure change rate of each differential pressure sensor in a preset period is positive, determining that each differential pressure value can represent the differential pressure of a filter bound with the differential pressure sensor corresponding to the differential pressure value;
if the differential pressure change rate of a part of differential pressure sensors in a preset period is positive and the differential pressure change rate of a part of differential pressure sensors is negative, determining that the differential pressure of the filter bound by the differential pressure sensor with the negative change rate is represented by the differential pressure value of any differential pressure sensor with the positive change rate and the filter bound by the differential pressure sensor with the positive change rate;
and if the differential pressure change rate of each differential pressure sensor in the preset period is negative, determining that each differential pressure value cannot represent the differential pressure of any filter.
3. The method of claim 2, wherein after determining from each of the pressure differential values whether each of the pressure differential values is indicative of a pressure differential across the filter, further comprising:
and if the detected pressure difference value represents the pressure difference of each filter, judging whether the pressure difference value reaches a preset pressure difference threshold, and if so, determining that the filter element of the filter bound by the pressure difference sensor corresponding to the pressure difference value reaching the preset pressure difference threshold fails.
4. The method of claim 2, wherein if the differential pressure change rate of the partial differential pressure sensor is positive and the differential pressure change rate of the partial differential pressure sensor is negative in the preset period, after determining that the differential pressure of the filter bound by the differential pressure sensor with the negative change rate is characterized by the differential pressure value of any differential pressure sensor with the positive change rate, the method further comprises:
and judging whether the determined pressure difference value representing the filter reaches a preset pressure difference threshold value, and if so, determining that the operation state of the filter group is abnormal.
5. The method of claim 1, further comprising, prior to obtaining the differential pressure value measured by at least one differential pressure sensor in the group:
determining that a speed of the engine is greater than or equal to an idle speed.
6. A device for detecting the operating condition of filter groups, the device being integrated in an engine, the engine comprising a plurality of filter groups, wherein each filter group comprises a plurality of filters and at least one differential pressure sensor, the effective operating duration of each filter is within a first preset duration range, the number of differential pressure sensors is smaller than the number of filters, the device comprising:
the data acquisition module is used for acquiring a differential pressure value measured by at least one differential pressure sensor in the group;
a first determining module for determining whether each of the pressure differential values is indicative of a pressure differential across the filter based on each of the pressure differential values;
the second determining module is used for determining the operation time of the filter group when the detected differential pressure value cannot represent the differential pressure of any one filter;
and the third determining module is used for determining that the operation state of the filter group is abnormal when the operation time of the filter reaches a second preset time.
7. The apparatus of claim 6, wherein the first determination module is specifically configured to determine whether each differential pressure value is indicative of a differential pressure across the filter by:
if the differential pressure change rate of each differential pressure sensor in a preset period is positive, determining that each differential pressure value can represent the differential pressure of a filter bound with the differential pressure sensor corresponding to the differential pressure value;
if the differential pressure change rate of a part of differential pressure sensors in a preset period is positive and the differential pressure change rate of a part of differential pressure sensors is negative, determining that the differential pressure of the filter bound by the differential pressure sensor with the negative change rate is represented by the differential pressure value of any differential pressure sensor with the positive change rate and the filter bound by the differential pressure sensor with the positive change rate;
and if the differential pressure change rate of each differential pressure sensor in the preset period is negative, determining that each differential pressure value cannot represent the differential pressure of any filter.
8. The device according to claim 7, further comprising a fourth determining module, configured to, after determining whether each pressure difference value can represent the pressure difference of the filter according to each pressure difference value, determine whether the pressure difference value reaches a preset pressure difference threshold value if the detected pressure difference value represents the pressure difference of each filter, and if so, determine that a filter element of the filter bound by the pressure difference sensor corresponding to the pressure difference value reaching the preset pressure difference threshold value is faulty.
9. An apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of any one of claims 1 to 5 are implemented when the computer program is executed by the processor.
10. A computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, implement the steps of the method of any one of claims 1 to 5.
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