CN114934852A - Filter element cleanliness estimation method and device based on exhaust oxygen concentration - Google Patents
Filter element cleanliness estimation method and device based on exhaust oxygen concentration Download PDFInfo
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000001301 oxygen Substances 0.000 title claims abstract description 76
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 53
- 230000003749 cleanliness Effects 0.000 title claims abstract description 46
- 238000002347 injection Methods 0.000 claims abstract description 23
- 239000007924 injection Substances 0.000 claims abstract description 23
- 238000002485 combustion reaction Methods 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims description 37
- 238000001914 filtration Methods 0.000 claims description 13
- 239000000446 fuel Substances 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 7
- 230000001960 triggered effect Effects 0.000 claims description 7
- 230000004907 flux Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000000875 corresponding effect Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000000243 solution Substances 0.000 description 5
- 239000000428 dust Substances 0.000 description 3
- 230000002596 correlated effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/228—Warning displays
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention provides a filter element cleanliness estimation method and device based on exhaust oxygen concentration, and the method comprises the following steps: determining the air inflow of the engine according to the air inlet humidity, the oil injection quantity and the exhaust oxygen concentration after combustion of the engine; determining the equivalent flow area of the filter screen according to the air inflow, the air inflow density of the engine and the pressure difference between two ends of the filter screen of the engine; judging whether the equivalent flow area is smaller than a preset alarm limit value or not; if yes, triggering an alarm with high filter screen blockage rate; that is, through oxygen concentration sensor accurate calculation engine air input to calculate the air current ability of filter screen in real time through the air input, remind the user to carry out the maintenance based on the state to the filter screen through the alarm.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a filter element cleanliness estimation method and device based on exhaust oxygen concentration.
Background
In order to ensure the air intake cleanliness of the diesel engine, an air filter screen is required to be installed at the air intake end to filter out dust and impurities in the air.
Under the more serious operating mode of dust, the speed that when the filter screen dust accumulation is very fast, causes the filter screen to block up easily to cause the engine air input not enough.
And the filter screen can not be cleaned in time in the prior art, thereby influencing the running function of the diesel engine and causing the damage of the diesel engine.
Disclosure of Invention
In view of this, the present invention aims to provide a method and an apparatus for estimating cleanliness of a filter element based on exhaust oxygen concentration, which are used for accurately calculating air inflow of an engine through an oxygen concentration sensor, calculating air circulation capacity of a filter screen in real time through the air inflow, and reminding a user of performing state-based maintenance on the filter screen through an alarm.
The application discloses in a first aspect, filter element cleanliness estimating method based on exhaust oxygen concentration, including:
determining the air inflow of the engine according to the air inlet humidity, the oil injection quantity and the exhaust oxygen concentration after combustion of the engine;
determining the equivalent flow area of the filter screen according to the air inflow, the air inflow density of the engine and the pressure difference between two ends of the filter screen of the engine;
judging whether the equivalent flow area is smaller than a preset alarm limit value or not;
if yes, an alarm with high filter screen blockage rate is triggered.
Optionally, in the method for estimating the cleanliness of the filter element based on the exhaust gas oxygen concentration, before determining the air intake amount of the engine according to the intake air humidity of the engine, the fuel injection amount, and the exhaust gas oxygen concentration after combustion, the method further includes:
judging whether the engine is in a preset stable working state or not;
and if so, executing the step of determining the air inflow of the engine according to the air inflow humidity, the oil injection quantity and the exhaust oxygen concentration after combustion of the engine.
Optionally, in the method for estimating the cleanliness of the filter element based on the oxygen concentration of the exhaust gas, determining whether the engine is in a preset stable working state includes:
acquiring real-time torque and real-time rotating speed of the engine in real time;
determining a torque sliding average standard deviation of the engine according to the real-time torque; and determining a rotating speed moving average standard deviation of the engine according to the real-time rotating speed;
judging whether the torque and the average standard deviation of the slip are simultaneously met, wherein the torque and the average standard deviation of the slip are smaller than a preset torque limit value, and the rotating speed and the average standard deviation of the slip are smaller than a preset rotating speed limit value;
if so, judging that the engine is in a preset stable working state;
and if not, judging that the engine is not in a preset stable working state.
Optionally, in the method for estimating the cleanliness of the filter element based on the oxygen concentration of the exhaust gas, the formula for determining the torque sliding average standard deviation of the engine is as follows:
the rotating speed moving average standard deviation of the engine is determined by the following formula:
wherein σ trq Is the torque running average standard deviation; sigma rpm The rotating speed is the moving average standard deviation; n is the number of sampling points of the current time point; n is i The rotating speed of the ith sampling point is; t is i Torque at the ith sample point;
is the mean rotation speed;
is the mean torque.
Optionally, in the method for estimating the cleanliness of the filter element based on the exhaust oxygen concentration, the formula for determining the intake air amount of the engine is as follows:
wherein the content of the first and second substances,
is the air intake quantity of the engine;
is the exhaust gas oxygen concentration; h s The intake air humidity is the intake air humidity;
the fuel injection quantity of the engine; o is 2 Is the atmospheric oxygen concentration.
Optionally, in the method for estimating the cleanliness of the filter element based on the exhaust oxygen concentration, before determining whether the equivalent flow area is smaller than a preset alarm limit, the method further includes:
and carrying out filtering treatment on the equivalent flow area.
Optionally, in the method for estimating the cleanliness of the filter element based on the exhaust oxygen concentration, determining whether the equivalent flow area is smaller than a preset alarm limit includes:
and judging whether the continuous preset times of the equivalent flow area are all smaller than a preset alarm limit value.
The application second aspect discloses a filter core cleanliness factor pre-estimation device based on exhaust oxygen concentration includes:
the engine air inflow estimation module is used for determining the air inflow of the engine according to the air inflow humidity, the oil injection quantity and the exhaust oxygen concentration after combustion of the engine;
a filter screen airflow flux estimation module for determining an equivalent flow area of the filter screen according to the intake air amount and a pressure difference across the filter screen of the engine;
the fault alarm module is used for judging whether the equivalent flow area is smaller than a preset alarm limit value or not; if yes, an alarm with high filter screen blockage rate is triggered.
Optionally, in the apparatus for estimating cleanliness of a filter element based on oxygen concentration of exhaust gas, the apparatus further includes:
the steady state condition judgment module is used for judging whether the engine is in a preset stable working state or not; if yes, triggering the engine air inflow estimation module, the filter screen air flow quantity estimation module and the fault alarm module to start to operate.
Optionally, in the apparatus for estimating cleanliness of a filter element based on oxygen concentration of exhaust gas, the apparatus further includes:
and the filtering module is used for carrying out filtering processing on the equivalent flow area.
According to the technical scheme, the filter element cleanliness estimation method based on the exhaust oxygen concentration comprises the following steps: determining the air inflow of the engine according to the air inlet humidity and the oil injection quantity of the engine and the oxygen concentration of exhaust gas after combustion; determining the equivalent flow area of the filter screen according to the air inflow, the air inflow density of the engine and the pressure difference between two ends of the filter screen of the engine; judging whether the equivalent flow area is smaller than a preset alarm limit value or not; if yes, triggering an alarm with high filter screen blockage rate; that is, through oxygen concentration sensor accurate calculation engine air input to calculate the air current ability of filter screen in real time through the air input, remind the user to carry out the maintenance based on the state to the filter screen through the alarm.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method for estimating cleanliness of a filter element based on oxygen concentration of exhaust gas according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for estimating filter element cleanliness based on exhaust gas oxygen concentration according to an embodiment of the present disclosure;
FIG. 3 is a flow chart of another method for estimating filter element cleanliness based on exhaust gas oxygen concentration according to an embodiment of the present disclosure;
FIG. 4 is a flow chart of another method for estimating filter element cleanliness based on exhaust gas oxygen concentration according to an embodiment of the present disclosure;
FIG. 5 is a flow chart of another method for estimating filter element cleanliness based on exhaust gas oxygen concentration according to an embodiment of the present disclosure;
FIG. 6 is a flowchart of a method for estimating filter element cleanliness based on exhaust gas oxygen concentration according to an embodiment of the present disclosure;
FIG. 7 is a flow chart of another method for estimating filter element cleanliness based on exhaust gas oxygen concentration according to an embodiment of the present disclosure;
FIG. 8 is a flow chart of another method for estimating filter element cleanliness based on exhaust gas oxygen concentration according to an embodiment of the present disclosure;
FIG. 9 is a flow chart of another method for estimating filter element cleanliness based on exhaust gas oxygen concentration according to an embodiment of the present disclosure;
fig. 10 is a schematic diagram of a filter element cleanliness estimation device based on exhaust gas oxygen concentration according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the application provides a filter element cleanliness estimating method based on exhaust oxygen concentration, and is used for solving the problems that a filter screen cannot be cleaned in time in the prior art, the running function of a diesel engine is influenced, and the diesel engine is damaged.
Referring to fig. 1, the method for estimating the cleanliness of a filter element based on the concentration of exhaust gas oxygen comprises the following steps:
s101, determining the air inflow of the engine according to the air inflow humidity, the oil injection quantity and the oxygen concentration of the exhaust after combustion of the engine.
It should be noted that the air intake amount of the engine can be obtained by calculating the air intake humidity, the fuel injection amount of the engine, and the oxygen concentration in the exhaust gas after combustion.
The NOx emission concentration sensor which is generally installed on the diesel engine can obtain an exhaust oxygen concentration signal C O2 The air inlet humidity signal H can be acquired by the air inlet humidity sensor arranged on the vehicle body s . Of course, the fuel injection quantity can be obtained through corresponding sensors, and can also be obtained through calculation, and the description is omitted here, and the decision can be determined according to actual conditions, all in the protection scope of the application.
The specific process of determining the air intake amount of the engine is not repeated herein, and may be determined according to the actual situation, all of which are within the protection scope of the present application.
S102, determining the equivalent flow area of the filter screen according to the air inflow, the air inflow density of the engine and the pressure difference between two ends of the filter screen of the engine.
It should be noted that the equivalent flow area is small when a large number of particles are attached to the screen, and the equivalent flow area is large when a small number of particles are attached to the screen.
Therefore, the equivalent flow area of the filter screen can be determined in the step, and the equivalent flow area is used as a factor for judging whether the blockage condition exists in the subsequent step.
And S103, judging whether the equivalent flow area is smaller than a preset alarm limit value or not.
The specific value of the preset alarm limit value is not repeated here, and is determined according to the actual situation, and is within the protection range of the application.
If the equivalent flow area is smaller than the preset alarm limit, step S104 is executed.
And S104, triggering an alarm with high filter screen blockage rate.
The alarm mode can be whistle, text display and the like, and is not repeated here any more, and the alarm mode can be determined according to actual conditions and is within the protection scope of the application.
That is, the filter screen needs to be cleaned at this time, so that the cleaned engine can operate better.
Specifically, referring to fig. 9, the filtered equivalent flow area is compared with a preset alarm limit value, and when the equivalent flow area is continuously detected for a plurality of times and is smaller than the preset alarm limit value, an alarm M with a high filter screen blockage rate is triggered.
Referring to fig. 9, it is determined whether the current flow area a is smaller than a preset alarm limit a threshold Obtaining a timing chart of the flow area A of the current volume and an early warning line (namely a preset alarm limit value A) threshold ) Above the pre-warning line, an alarm with a high filter screen clogging rate is triggered.
In the embodiment, the air inflow of the engine is determined according to the air inflow humidity, the oil injection quantity and the oxygen concentration of the exhaust after combustion of the engine; determining the equivalent flow area of the filter screen according to the air inflow, the air inflow density of the engine and the pressure difference between two ends of the filter screen of the engine; judging whether the equivalent flow area is smaller than a preset alarm limit value or not; if yes, triggering an alarm with high filter screen blockage rate; that is, through oxygen concentration sensor accurate calculation engine air input to calculate the air current ability of filter screen in real time through the air input, remind the user to carry out the maintenance based on the state to the filter screen through the alarm.
In practical application, referring to fig. 2, before determining the intake air amount of the engine according to the intake air humidity, the fuel injection amount and the exhaust gas oxygen concentration after combustion in step S102, the method further includes:
s201, judging whether the engine is in a preset stable working state.
It should be noted that, because the estimation of the air circulation capacity of the filter screen needs to be performed under a relatively stable air intake condition, it needs to be determined whether the engine works in a relatively stable working state, so that the estimation accuracy is improved; that is to say, when being in and predetermine steady operating condition, it is high to predict the precision, when not being in and predetermine steady operating condition, it is low to predict the precision.
And if the engine is in a preset stable working state, executing the step S101, and determining the air inflow of the engine according to the air inlet humidity, the oil injection quantity and the exhaust oxygen concentration after combustion of the engine.
In practical applications, referring to fig. 3, the step S201 of determining whether the engine is in the preset stable operating state includes:
and S301, acquiring real-time torque and real-time rotating speed of the engine in real time.
It should be noted that the real-time torque and the real-time rotation speed of the engine may be obtained by corresponding sensors respectively.
S302, determining the torque sliding average standard deviation of the engine according to the real-time torque; and determining the rotating speed moving average standard deviation of the engine according to the real-time rotating speed.
It should be noted that, the determination of the torque moving average standard deviation of the engine and the determination of the rotating speed moving average standard deviation of the engine are not specifically limited herein, and may be determined as the case may be, and are within the protection scope of the present application.
And S303, judging whether the torque and the sliding average standard deviation are simultaneously met, wherein the torque and the sliding average standard deviation are smaller than a preset torque limit value, and the rotating speed and the sliding average standard deviation are smaller than a preset rotating speed limit value.
It should be noted that specific values of the preset torque limit value are not described in detail herein, and are all within the protection scope of the present application depending on the actual situation.
The specific value of the preset rotation speed limit value is not repeated one by one here, and the specific value is determined according to actual conditions and is within the protection range of the application.
If the torque moving average standard deviation is smaller than the preset torque limit and the rotating speed moving average standard deviation is smaller than the preset rotating speed limit, step S304 is executed.
And S304, judging that the engine is in a preset stable working state.
If not, the torque running average standard deviation is smaller than the preset torque limit, and the rotating speed running average standard deviation is smaller than the preset rotating speed limit, step S305 is executed.
And S305, judging that the engine is not in a preset stable working state.
In practical applications, the equation used to determine the torque running average standard deviation of the engine in step S302 is:
the equation involved in determining the moving average standard deviation of the engine' S speed involved in step S302 is:
wherein σ trq Is the torque running average standard deviation; sigma rpm The rotating speed is the moving average standard deviation; n is the number of sampling points of the current time point, namely the number of sampling points of the moving average window; n is i For the rotation of the ith sampling pointSpeed; t is a unit of i Torque at the ith sample point;
is the mean rotation speed;
is the mean torque.
Specifically, referring to fig. 6, the real-time torque T and the real-time rotation speed n are input into the corresponding calculation model using the formula
The model output torque moving average standard deviation sigma trq Sum rotation speed moving average standard deviation sigma rpm (ii) a Moving the torque by the mean standard deviation σ trq Sum rotation speed moving average standard deviation sigma rpm Input to a corresponding judging module, wherein the formula adopted by the judging module is
A calculation enable signal E is obtained which can be applied to other modules in the system to trigger the execution of the corresponding steps.
In practical applications, the above formula for determining the intake air amount of the engine in step S101 is:
wherein, the first and the second end of the pipe are connected with each other,
is the air intake quantity of the engine;
is the exhaust gas oxygen concentration; hs is the intake air humidity;
the fuel injection quantity of the engine; o is 2 Is the atmosphereThe oxygen concentration.
That is, the intake air amount is positively correlated with the exhaust gas oxygen concentration and the fuel injection amount; the intake air amount is inversely correlated with the intake air humidity signal.
Specifically, referring to FIG. 7, exhaust gas oxygen concentration
Air inlet humidity signal Hs and fuel injection quantity
Is input into a corresponding calculation model which adopts the formula
The model outputs the air input
Wherein the intake air amount is a fresh air intake air amount.
In practical applications, the formula for determining the equivalent flow area of the filter screen is as follows:
wherein A is the equivalent flow area;
is the air input; rho 1 Is the charge density; and delta P is the pressure difference between two ends of the filter screen.
In practical application, referring to fig. 4, before determining whether the equivalent flow area is smaller than the preset alarm limit in step S103, the method further includes:
s401, filtering the equivalent flow area.
Specifically, the equivalent flow area a of the filter screen is calculated, and signal denoising and filtering are performed through a first-order low-pass filter, so that an equivalent flow area signal a after filtering is obtained.
Specifically, this step is responsible for calculating the air flow capacity of the screen, i.e., the equivalent flow area of the screen. Therefore, an atmospheric pressure sensor is required to be installed on a vehicle body, an air pressure sensor is installed behind a filter screen of an engine air inlet, and the difference between the measured values of the atmospheric pressure sensor and the air pressure sensor is obtained to obtain the pressure difference between two ends of the filter screen; the engine intake air density can be obtained by reading and looking up a table through an ambient temperature sensor and an atmospheric pressure sensor which are arranged on a vehicle body. And calculating the equivalent flow area A of the filter screen, and performing signal noise reduction and filtering through a first-order low-pass filter to obtain a filtered equivalent flow area signal A.
Referring to fig. 8, the intake air amount
Intake air density ρ 1 The pressure difference delta P between two ends of the filter screen is input into a corresponding calculation model, and the formula adopted by the model is
The output of the model is filtered to obtain the final equivalent flow area a.
In practical application, referring to fig. 5, the step S103 of determining whether the equivalent flow area is smaller than the preset alarm limit includes:
s501, judging whether the continuous preset times of the equivalent flow area are smaller than a preset alarm limit value.
That is, the number of times less than the preset alarm limit is set.
The preset number of times may be 1 time or at least 2 times, which is not described herein any more, and is within the scope of the present application depending on the actual situation.
Another embodiment of the application provides a filter core cleanliness factor estimation device based on exhaust oxygen concentration.
Referring to fig. 10, the device for estimating the cleanliness of the filter element based on the oxygen concentration of the exhaust gas comprises:
the engine air inflow estimation module 102 is configured to determine an air inflow of the engine according to an intake humidity of the engine, an injection amount of the engine, and an exhaust oxygen concentration after combustion.
And a filter screen airflow flux estimation module 103 for determining the equivalent flow area of the filter screen based on the intake air amount and the pressure difference across the filter screen of the engine.
The fault alarm module 104 is used for judging whether the equivalent flow area is smaller than a preset alarm limit value; if yes, an alarm M with high filter screen blockage rate is triggered.
The working process and principle of each module are referred to the filter element cleanliness estimation method based on exhaust gas oxygen concentration in detail, which is provided by the above embodiment, and the details are not repeated here, and are determined according to the actual situation, and are all within the protection scope of the present application.
In the embodiment, the engine air inflow estimation module determines the air inflow of the engine according to the air inflow humidity, the oil injection quantity and the oxygen concentration of exhaust gas after combustion of the engine; a filter screen air flow estimation module determines an equivalent flow area of the filter screen according to the air intake amount, the air intake density of the engine and a pressure difference between two ends of the filter screen of the engine; the fault alarm module judges whether the equivalent flow area is smaller than a preset alarm limit value or not; if yes, triggering an alarm M with high filter screen blockage rate; that is, through oxygen concentration sensor accurate calculation engine air input to calculate the air current ability of filter screen in real time through the air input, remind the user to carry out the maintenance based on the state to the filter screen through the alarm.
In practical applications, referring also to fig. 6, the device for estimating cleanliness of a filter element based on oxygen concentration of exhaust gas further includes:
the steady state condition judgment module 101 is used for judging whether the engine is in a preset stable working state or not; and if so, triggering the engine air inflow estimation module, the filter screen air flow estimation module and the fault alarm module to start running.
For details of the working process and principle of the steady-state condition judgment module 101, reference is made to the filter element cleanliness estimation method based on exhaust oxygen concentration provided in the above embodiment, which is not described herein any more, and all that is required is within the protection scope of the present application, depending on the actual situation.
In practical application, filter core cleanliness factor estimation device based on exhaust oxygen concentration still includes:
and a filtering module (not shown) for performing filtering processing on the equivalent flow area.
The working process and principle of the filtering module are referred to the filter element cleanliness estimation method based on exhaust oxygen concentration in detail, which is provided by the embodiment, and the method is not repeated here, and is determined according to the actual situation, and is all within the protection scope of the present application.
Features described in the embodiments in the present specification may be replaced with or combined with each other, and the same and similar portions among the embodiments may be referred to each other, and each embodiment is described with emphasis on differences from other embodiments. In particular, the system or system embodiments, which are substantially similar to the method embodiments, are described in a relatively simple manner, and reference may be made to some descriptions of the method embodiments for relevant points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A filter element cleanliness estimation method based on exhaust oxygen concentration is characterized by comprising the following steps:
determining the air inflow of the engine according to the air inlet humidity, the oil injection quantity and the exhaust oxygen concentration after combustion of the engine;
determining the equivalent flow area of the filter screen according to the air inflow, the air inflow density of the engine and the pressure difference between two ends of the filter screen of the engine;
judging whether the equivalent flow area is smaller than a preset alarm limit value or not;
if yes, an alarm with high filter screen blockage rate is triggered.
2. The method for estimating cleanliness of a filter element based on exhaust gas oxygen concentration according to claim 1, wherein before determining an intake air amount of an engine according to intake air humidity, fuel injection amount and exhaust gas oxygen concentration after combustion, the method further comprises:
judging whether the engine is in a preset stable working state or not;
and if so, executing the step of determining the air inflow of the engine according to the air inflow humidity, the oil injection quantity and the oxygen concentration of the exhaust after combustion of the engine.
3. The exhaust gas oxygen concentration-based filter element cleanliness estimation method according to claim 2, wherein the judging whether the engine is in a preset steady working state comprises:
acquiring real-time torque and real-time rotating speed of the engine in real time;
determining a torque running average standard deviation of the engine according to the real-time torque; and determining a rotating speed moving average standard deviation of the engine according to the real-time rotating speed;
judging whether the torque and the rotating speed are simultaneously met, wherein the torque and the rotating speed are less than a preset torque limit value, and the rotating speed are less than a preset rotating speed limit value;
if so, judging that the engine is in a preset stable working state;
and if not, judging that the engine is not in a preset stable working state.
4. The exhaust gas oxygen concentration-based filter element cleanliness estimation method according to claim 3, wherein the torque sliding mean standard deviation of the engine is determined by the formula:
the formula used to determine the rotating speed moving average standard deviation of the engine is:
wherein σ trq Is the torque running average standard deviation; sigma rpm The rotating speed is the rotating speed sliding average standard deviation; n is the number of sampling points of the current time point; n is i The rotating speed of the ith sampling point is; t is i Torque at the ith sample point;
is the mean rotation speed;
is the mean torque.
5. The exhaust oxygen concentration-based filter element cleanliness estimation method according to claim 1, wherein the engine intake air amount is determined by the following formula:
wherein the content of the first and second substances,
is the air intake quantity of the engine;
is the exhaust gas oxygen concentration; h s The intake air humidity is the intake air humidity;
the fuel injection quantity of the engine; o is 2 Is the atmospheric oxygen concentration.
6. The exhaust gas oxygen concentration-based filter element cleanliness estimation method according to claim 1, before determining whether the equivalent flow area is smaller than a preset alarm limit value, further comprising:
and carrying out filtering treatment on the equivalent flow area.
7. The exhaust gas oxygen concentration-based filter element cleanliness estimation method according to claim 1, wherein the judging whether the equivalent flow area is smaller than a preset alarm limit value comprises:
and judging whether the continuous preset times of the equivalent flow area are all smaller than a preset alarm limit value.
8. The utility model provides a filter core cleanliness factor pre-estimation device based on exhaust oxygen concentration which characterized in that includes:
the engine air inflow estimation module is used for determining the air inflow of the engine according to the air inflow humidity, the oil injection quantity and the exhaust oxygen concentration after combustion of the engine;
a strainer airflow flux estimation module for determining an equivalent flow area of the strainer based on the intake air amount and a pressure differential across a strainer of the engine;
the fault alarm module is used for judging whether the equivalent flow area is smaller than a preset alarm limit value or not; if yes, an alarm with high filter screen blockage rate is triggered.
9. The exhaust gas oxygen concentration-based filter element cleanliness estimation device according to claim 8, further comprising:
the steady state condition judgment module is used for judging whether the engine is in a preset stable working state or not; and if so, triggering the engine air inflow estimation module, the filter screen airflow flux estimation module and the fault alarm module to start to operate.
10. The exhaust gas oxygen concentration-based filter element cleanliness estimation device according to claim 8, further comprising:
and the filtering module is used for carrying out filtering processing on the equivalent flow area.
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