Air inlet regulation and control method and equipment for air compressor and medium

Abstract

The embodiment of the invention discloses an air inlet regulation and control method and device of an air compressor and a medium, belongs to the technical field of air compressors, and solves the problem that when the oil gas concentration in an air inlet pipeline is increased, redundant oil is difficult to discharge in a single air inlet pipeline air taking mode, and finally oil leakage of an air outlet of the air compressor is caused. Comprising the steps that oil gas concentration is compared with a preset oil gas concentration threshold value, and a gas inlet switching strategy is determined based on a comparison result; inputting the operation condition of the air compressor and the oil gas concentration into a preset oil leakage detection model to obtain an oil leakage prediction result; on the basis of the oil leakage prediction result, different air inlet amplitude adjustment strategies are matched; based on the air inlet switching strategy and the air inlet amplitude adjusting strategy, a three-way valve arranged on an air inlet pipeline is adjusted and controlled so as to achieve air inlet adjustment and control of the air compressor; wherein the three-way valve is arranged behind the oil gas concentration sensor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air compressors, in particular to an air compressor air intake regulation method, device and medium. BACKGROUND

[0002] During the operation of the air compressor, the oil-gas concentration control of the air intake system is a key factor affecting the working stability and oil leakage problem. In the prior art, the air compressor usually takes air through a single air intake pipe.

[0003] The single air intake pipe air taking method has simple structure and low cost. However, when the oil content of the intake air increases abnormally due to the failure of the supercharger, or the filtering efficiency is low due to the damage of the oil-gas separator, the oil-gas concentration in the air intake pipe will increase, and the high oil-gas concentration will directly enter the internal air compressor, which will not only cause the imbalance of the mixing ratio of the internal lubricating oil and the oil in the intake air, and damage the normal working state of the lubrication system, but also increase the separation difficulty of the oil-gas mixture in the compression process, and the excess oil is difficult to be effectively discharged through the internal separation structure, finally causing the air compressor to leak oil at the air outlet. SUMMARY

[0004] The embodiments of the present application provide an air compressor air intake regulation method, device and medium, which are used to solve the technical problem that when the oil-gas concentration in the air intake pipe increases, the single air intake pipe air taking method cannot discharge the excess oil, and finally causes the air compressor to leak oil at the air outlet.

[0005] The embodiments of the present application adopt the following technical solutions: The embodiments of the present application provide an air compressor air intake regulation method. The method comprises: comparing the oil-gas concentration with a preset oil-gas concentration threshold value, and determining an air intake switching strategy based on the comparison result; inputting the air compressor operating condition and the oil-gas concentration into a preset oil leakage detection model to obtain an oil leakage prediction result; matching different air intake amplitude adjustment strategies based on the oil leakage prediction result; and regulating and controlling a three-way valve arranged on the air intake pipe based on the air intake switching strategy and the air intake amplitude adjustment strategy, so as to realize air compressor air intake regulation; wherein the three-way valve is arranged after an oil-gas concentration sensor.

[0006] In one implementation manner of the present application, the oil-gas concentration is compared with the preset oil-gas concentration threshold value, and the air intake switching strategy is determined based on the comparison result, specifically comprising: when the oil-gas concentration is not greater than the preset oil-gas concentration threshold value, the determined air intake switching strategy is supercharged air intake; and when the oil-gas concentration is greater than the preset oil-gas concentration threshold value, the determined air intake switching strategy is natural aspiration, and a fault code alarm is performed.

[0007] In an implementation form of the present application, before the oil and gas concentration is compared with the preset oil and gas concentration threshold, the method further comprises: setting an initial allowance coefficient based on the air compressor running time; obtaining a set of running parameters corresponding to each component based on the historical database corresponding to the air compressor and the components corresponding to the air compressor; obtaining a regulation coefficient based on the difference between each set of running parameters and the corresponding target parameter set and the importance of each component; adjusting the initial oil and gas concentration threshold based on the regulation coefficient and the initial allowance coefficient to obtain the preset oil and gas concentration threshold.

[0008] In an implementation form of the present application, before the air compressor operating condition and the oil and gas concentration are input into the preset oil leakage detection model, the method further comprises: obtaining oil leakage event data in the historical operation of the air compressor, and labeling and classifying the oil leakage event data according to a preset condition dimension to construct a multi-dimensional historical database; wherein the preset condition dimension at least includes one of load level, environmental parameter and equipment aging degree; constructing a historical oil and gas concentration time curve based on the oil leakage event data, and marking the oil leakage occurrence time and the corresponding condition parameters in the historical oil and gas concentration time curve; based on the multi-dimensional historical database, extracting features of the oil and gas concentration time curve under the same label classification to obtain concentration change features; wherein the concentration change features at least include one of concentration change rate, concentration fluctuation entropy value and concentration curvature; constructing a preset oil leakage detection model based on the oil leakage occurrence time and the concentration change features.

[0009] In an implementation form of the present application, before the air compressor operating condition and the oil and gas concentration are input into the preset oil leakage detection model, the method further comprises: obtaining oil and gas concentration time series data and current condition parameters corresponding to the current operation of the air compressor; based on the current running oil and gas concentration time series data and the current condition parameters, matching the corresponding label classification in the historical database; based on the label classification, calling the preset oil leakage detection model to output a plurality of continuous time intervals and the oil leakage probability corresponding to each time interval to obtain the oil leakage prediction result.

[0010] In an implementation form of the present application, based on the oil leakage prediction result, different air inlet amplitude adjustment strategies are matched, specifically comprising: in the case that the oil leakage prediction result meets the regulation condition, triggering the corresponding switching mode based on the air compressor load parameter and the concentration change rate corresponding to the oil and gas concentration; wherein the switching mode at least includes one of gradual switching mode, acceleration switching mode and emergency switching mode; based on the switching mode, the corresponding air inlet amplitude adjustment strategy is matched; wherein the air inlet amplitude adjustment strategy at least includes the number of adjustment stages and the opening amplitude corresponding to each adjustment stage.

[0011] In an implementation form of the present application, based on the intake port switching strategy and the intake port amplitude adjustment strategy, the three-way valve arranged on the intake pipe is regulated and controlled, specifically including: sending the driving signals corresponding to the intake port switching strategy and the intake port amplitude adjustment strategy to the supercharged intake end corresponding to the three-way valve; and sending the driving signals corresponding to the intake port switching strategy and the intake port amplitude adjustment strategy to the naturally aspirated end corresponding to the three-way valve; based on the driving signals, the opening degrees of the supercharged intake end and the naturally aspirated end in different adjustment stages are complementary.

[0012] In an implementation form of the present application, after the oil-gas concentration corresponding to the intake pipe is obtained through the oil-gas concentration sensor arranged on the engine intake pipe, the method further includes: when the oil-gas concentration of the engine intake pipe meets the preset normal threshold range, but the air compressor still has oil leakage phenomenon, maintaining the rated working state of the air compressor, and collecting multi-dimensional detection data corresponding to the air compressor within a preset time period; wherein the multi-dimensional detection data at least includes one of oil-gas related data and supercharging related data; based on the multi-dimensional detection data, a fault feature analysis model is constructed, and through the fault feature analysis model, if the detection data meets the first fault determination logic, it is determined that the fault source is the abnormality of the oil-gas separation component; wherein the first fault determination logic is that the difference between the oil-gas related data is greater than the preset difference threshold, and the supercharging related data is in the preset rated range; if the detection data meets the second fault determination logic, it is determined that the fault source is the abnormality of the supercharging component; wherein the second fault determination logic is that the difference between the oil-gas related data is not greater than the preset difference threshold, and any one of the supercharging related data is greater than the preset rated range.

[0013] The embodiment of the present application provides an air compressor intake regulation device, including: at least one processor; and a memory in communication connection with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to: compare the oil-gas concentration with the preset oil-gas concentration threshold value, and determine the intake port switching strategy based on the comparison result; input the oil-gas concentration and the operating condition of the air compressor into the preset oil leakage detection model to obtain a leakage prediction result; based on the leakage prediction result, match different intake port amplitude adjustment strategies; based on the intake port switching strategy and the intake port amplitude adjustment strategy, regulate and control the three-way valve arranged on the intake pipe to realize the air compressor intake regulation; wherein the three-way valve is arranged after the oil-gas concentration sensor.

[0014] The non-volatile computer storage medium provided by the embodiment of the application stores computer executable instructions, and the computer executable instructions are configured to: compare the oil gas concentration with a preset oil gas concentration threshold value, determine an air inlet switching strategy based on the comparison result; input the air compressor operating condition and the oil gas concentration into a preset oil leakage detection model to obtain an oil leakage prediction result; match different air inlet amplitude adjustment strategies based on the oil leakage prediction result; and control a three-way valve arranged on an air inlet pipeline based on the air inlet switching strategy and the air inlet amplitude adjustment strategy, so as to realize air inlet control of the air compressor; and the three-way valve is arranged after the oil gas concentration sensor.

[0015] The above at least one technical solution adopted by the embodiment of the application can achieve the following beneficial effects: the embodiment of the application can quickly cut off the high oil gas concentration gas source by comparing the oil gas concentration with the preset oil gas concentration threshold value and switching the air inlet, thereby reducing the oil entering the air compressor from the source and reducing the risk of oil leakage at the air outlet. Secondly, the embodiment of the application can adjust the air inlet strategy in advance by outputting the oil leakage probability in different time intervals, thereby improving the safety and stability of the air compressor operation. In addition, the embodiment of the application can prevent the pipeline pressure from rising and falling suddenly by controlling the opening of the boost air inlet end and the natural suction end through the three-way valve, thereby reducing the impact on the air compressor cylinder. At the same time, the valve control directly acts on the air inlet source, can quickly respond to the strategy instruction, realizes accurate control of the air inlet quality and air inlet quantity of the air compressor, reduces the risk of oil leakage and guarantees stable operation of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the application, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings: Figure 1 A three-way valve installation schematic diagram is provided for the embodiment of the application; Figure 2 A flow chart of an air compressor air inlet control method is provided for the embodiment of the application; Figure 3 A structure schematic diagram of an air compressor air inlet control device is provided for the embodiment of the application. DETAILED DESCRIPTION

[0017] The embodiment of the application provides an air compressor air inlet control method, device and medium.

[0018] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0019] The technical solutions proposed in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of a three-way valve installation provided in an embodiment of this application, as shown below. Figure 1 As shown in the diagram, the starting point of the three-way valve installation is the engine intake end, which provides the basic intake air required by the air compressor. Along the airflow direction, an air filter is first connected in series to filter impurities in the intake air, preventing particulate matter from entering subsequent components and causing wear. Downstream of the air filter is an oil-gas separator, whose function is to separate oil mixed in the intake air, reducing the initial oil-gas concentration. Downstream of the oil-gas separator is an oil-gas concentration sensor P, which is directly connected to the intake pipeline and can collect real-time data on the oil-gas concentration of the filtered and separated intake air, providing a core detection signal for subsequent intake mode determination. Downstream of the oil-gas concentration sensor P is a three-way valve connected in series. This three-way valve is the core actuator for intake mode switching, with two intake ports and one outlet port. The two intake ports correspond to the boosted intake path and the naturally aspirated path, respectively, and the outlet port is directly connected to the air compressor intake end, enabling selective output of the two intake modes. The structure also includes an aftertreatment assembly, which is associated with the engine exhaust system and used to treat the exhaust gas emitted by the engine.

[0021] Furthermore, in the embodiment of this application, the oil and gas concentration sensor P collects concentration data that is the key basis for determining whether to switch the intake mode. When P≤P0 is detected, the three-way valve defaults to connecting the booster intake path, and the booster device increases the intake pressure to meet the intake demand of the air compressor under high load conditions. When P>P0 is detected, the three-way valve switches to the natural intake path, cuts off the booster intake with high oil and gas concentration, and avoids excessive oil entering the air compressor.

[0022] Figure 2 A flowchart of an air compressor intake control method provided in this application embodiment is shown below. Figure 1 As shown, the air compressor intake control method includes the following steps: S101. The oil and gas concentration corresponding to the intake manifold is obtained by using an oil and gas concentration sensor installed in the engine intake manifold.

[0023] In an implementation form of the present application, after the engine and the air compressor are started, the sensor continuously monitors the oil-gas concentration in the intake pipeline, and collects the oil-gas concentration data in the engine intake pipeline in real time. The control system receives the oil-gas concentration data in real time and converts it into a specific concentration value, and simultaneously feeds back the concentration value to the display end, thereby providing real-time concentration data support for subsequent comparison of the concentration with the threshold value and determination of the intake port switching strategy.

[0024] In S102, the oil-gas concentration is compared with the preset oil-gas concentration threshold value, and the intake port switching strategy is determined based on the comparison result.

[0025] In an implementation form of the present application, when the oil-gas concentration is not greater than the preset oil-gas concentration threshold value, the determined intake port switching strategy is supercharged intake. When the oil-gas concentration is greater than the preset oil-gas concentration threshold value, the determined intake port switching strategy is natural aspiration, and a fault code alarm is performed.

[0026] Specifically, the oil-gas concentration P in the intake pipeline is continuously monitored. When the oil content of the intake increases due to the failure of the supercharger, or the filtering efficiency of the oil-gas separator is low due to damage, the oil-gas concentration P in the intake pipeline increases. P0 is the intake concentration threshold value accepted by the air compressor, which represents that the oil-gas concentration value of the intake pipeline exceeds the allowable value of the air compressor (or a 20% margin is reserved), and the oil leakage problem occurs at the outlet after entering the air compressor. When P≤P0, the supercharged intake is selected, and the air compressor works normally; when P>P0, the natural aspiration cycle is entered in an emergency, and a fault code is reported, prompting the driver to take emergency measures. The embodiment of the present application can automatically select the intake structure of the air compressor based on the change of the oil-gas concentration, and effectively avoid the oil leakage problem of the air compressor caused by the increase of the oil-gas concentration.

[0027] In an implementation form of the present application, before the oil-gas concentration is compared with the preset oil-gas concentration threshold value, an initial margin coefficient is also set based on the running time length of the air compressor. According to the historical database corresponding to the air compressor and the constituent components corresponding to the air compressor, a set of running parameters corresponding to each constituent component is obtained. Based on the difference between each set of running parameters and the corresponding target parameter set, and the importance of each constituent component, a control coefficient is obtained. Based on the control coefficient and the initial margin coefficient, the initial oil-gas concentration threshold value is adjusted to obtain the preset oil-gas concentration threshold value.

[0028] Specifically, the embodiment of the application first counts the cumulative running time of the air compressor and divides the stages, sets the initial margin coefficient for different running stages, for example: in the new equipment stage, the component performance is stable, the initial margin coefficient is set to 10%-15%; in the medium running stage, the components begin to have slight wear, the initial margin coefficient is set to 18%-22%; in the aging stage, the component performance decays obviously, the initial margin coefficient is set to 25%-30%, to ensure that the initial margin coefficient is adapted to the aging degree of the air compressor equipment. The historical running database of the air compressor is retrieved, and the running parameters corresponding to each core component are extracted from the database, for example: for the supercharger, the supercharging pressure, driving current, vibration frequency and other parameters in the historical running are extracted to form the supercharger running parameter set; for the oil-gas separator, the outlet oil-gas concentration, filtration efficiency, pressure difference and other parameters in the historical running are extracted to form the oil-gas separator running parameter set.

[0029] Further, the target parameter set is set for the supercharger, the oil-gas separator and other components, and the difference between each parameter in the component running parameter set and the corresponding parameter in the target parameter set is calculated. Then, the importance is set according to the influence of the component on the inlet gas concentration, for example: the oil-gas separator directly affects the inlet oil-gas filtration, and the importance is set to 60%; the supercharger affects the inlet gas pressure and indirectly relates to the concentration change, and the importance is set to 40%. Based on the size of the parameter difference and the importance of the component, the final regulation coefficient is obtained by weighted calculation, to realize the quantitative feedback of the component running abnormity.

[0030] Further, the air compressor inlet gas concentration reference threshold is determined, the obtained regulation coefficient is superimposed and calculated with the set initial margin coefficient to obtain the final margin coefficient, and finally the preset oil-gas concentration threshold is calculated according to the formula: preset oil-gas concentration threshold = P_base x (1+final margin coefficient), which reflects the aging influence of the equipment running time and reflects the real-time running state of the core component. Wherein, P_base is the initial oil-gas concentration threshold.

[0031] S103, input the air compressor running condition and oil-gas concentration into the preset oil leakage detection model to obtain the oil leakage prediction result.

[0032] In an implementation form of the present application, the oil leakage event data in the historical operation of the air compressor is acquired, the oil leakage event data is labeled and classified according to preset working condition dimensions, and a multi-dimensional historical database is constructed; wherein the preset working condition dimensions at least include one of load level, environmental parameters and equipment aging degree. The historical oil and gas concentration time curve is constructed based on the oil leakage event data, and the oil leakage occurrence time and corresponding working condition parameters are marked in the historical oil and gas concentration time curve. Based on the multi-dimensional historical database, the oil and gas concentration time curve under the same label classification is feature extracted to obtain concentration change characteristics; wherein the concentration change characteristics at least include one of concentration change rate, concentration fluctuation entropy value and concentration curvature. The preset oil leakage detection model is constructed based on the oil leakage occurrence time and the concentration change characteristics.

[0033] Specifically, all data of oil leakage events in the historical operation process are screened out, and the data need to include the inlet oil and gas concentration at the time of oil leakage, the corresponding running time, and the working condition information related to oil leakage. The screened oil leakage event data is labeled and classified according to preset working condition dimensions, for example: the load level can be divided into low load, medium load and high load labels; the environmental parameters can be divided into labels according to the inlet temperature and environmental humidity in the historical record; the equipment aging degree can be divided into labels according to the cumulative running time of the air compressor at the time of oil leakage event. The classified oil leakage event data is arranged according to the label dimension to form a multi-dimensional historical database covering different working condition scenarios. The complete oil and gas concentration data corresponding to each oil leakage event is extracted from the multi-dimensional historical database, with time as the horizontal axis and oil and gas concentration value as the vertical axis, and the historical oil and gas concentration time curve is constructed for each oil leakage event. The curve needs to completely present the oil and gas concentration change process before, at and after the oil leakage. On each constructed time curve, the specific time node of oil leakage is marked, and the working condition parameter label to which the oil leakage event belongs is supplemented beside the corresponding time node, so that each time curve can reflect the dynamic change of concentration with time, and can also be associated with the corresponding working condition background, reflecting the correlation between oil and gas concentration change and oil leakage event under different working conditions.

[0034] Further, all oil and gas concentration time series curves under the same working condition label classification are screened out from the multi-dimensional historical database, and feature extraction is performed on the group of curves. During the extraction process, at least the following concentration change features are calculated: concentration change rate, which is calculated by selecting the concentration data in the key time period before oil leakage occurs in the curve, calculating the concentration change amplitude per unit time through the ratio of the concentration difference between adjacent time points and the time interval, and reflecting the rate of concentration rise or fall; concentration fluctuation entropy value, which quantifies the fluctuation intensity of the concentration in a period of time by statistical concentration data dispersion, and the higher the fluctuation entropy value, the more unstable the concentration; concentration curvature, which calculates the curvature value of the curve at the key node before oil leakage occurs after smoothing the time series curve, and reflects the turning degree of the concentration change trend. The extracted feature values are associated with the corresponding working condition label to form a concentration change feature set under the label classification.

[0035] Further, all concentration change feature sets under the working condition label classification are sorted out, and the concentration change features in each feature set are associated and analyzed with the corresponding oil leakage occurrence time to determine the relevance of different features to oil leakage. Based on the association relationship, the judgment logic of the model is constructed: after the real-time collected oil and gas concentration time series data are extracted by the same method, they are compared with the feature threshold values under different working condition labels in the model, and if the real-time features meet the oil leakage associated feature conditions under a certain working condition, the model outputs the corresponding oil leakage risk prediction result. At the same time, the data in the multi-dimensional historical database are used as training samples to optimize the feature threshold values and judgment logic of the model, and finally a pre-set oil leakage detection model that can be used for real-time prediction is formed.

[0036] In an implementation manner of the present application, current running oil and gas concentration time series data and current working condition parameters corresponding to the air compressor are acquired. Based on the current running oil and gas concentration time series data and the current working condition parameters, a corresponding label classification is matched in the historical database. Based on the label classification, a pre-set oil leakage detection model is called to output a plurality of continuous time intervals and oil leakage probabilities corresponding to each time interval, and a leakage prediction result is obtained.

[0037] Specifically, the oil and gas concentration sensor installed on the engine intake pipe is used to collect current intake oil and gas concentration data at a preset time interval, and continuous collection is performed for a preset time length to form current running oil and gas concentration time series data, so as to ensure that the data can reflect the dynamic change trend of the concentration with time. At the same time, the current working condition parameters of the air compressor are synchronously collected, which can include the current load level of the air compressor, environmental parameters, and device aging related parameters.

[0038] Further, the current load level is compared with the load labels in the historical database to determine a load label, the current intake temperature and ambient humidity are compared with the environmental parameter labels in the historical database to determine an environmental label, and the current cumulative running time is compared with the equipment aging degree labels in the historical database to determine an aging label. Subsequently, all historical data groups consistent with the current load label, environmental label and aging label are screened out in the historical database to determine the label classification corresponding to the current data. The obtained current oil and gas concentration time series data is subjected to the same feature extraction method as the historical data to obtain the current concentration change feature. The current concentration change feature is input into the preset oil leakage detection model corresponding to the label classification, the preset oil leakage detection model compares the feature value with the preset threshold value, combines the correlation between the concentration feature and the oil leakage occurrence time under the label in the historical database, and outputs a plurality of continuous time intervals and the oil leakage probability corresponding to each interval to finally form a complete oil leakage prediction result.

[0039] In S104, different intake port amplitude adjustment strategies are matched based on the oil leakage prediction result.

[0040] In an implementation manner of the present application, in the case that the oil leakage prediction result meets the regulation condition, a corresponding switching mode is triggered based on the load parameters of the air compressor and the concentration change rate corresponding to the oil and gas concentration, wherein the switching mode at least includes one of a gradual switching mode, an accelerated switching mode and an emergency switching mode. Based on the switching mode, a corresponding intake port amplitude adjustment strategy is matched, wherein the intake port amplitude adjustment strategy at least includes the number of adjustment stages and the opening amplitude corresponding to each adjustment stage.

[0041] Specifically, the oil leakage probability of each continuous time interval is extracted from the oil leakage prediction result. If the oil leakage probability of any time interval is not less than a preset risk threshold value, it is determined that the oil leakage prediction result meets the regulation condition, and the intake port switching mode and amplitude adjustment process need to be started.

[0042] Further, after determining that the regulation condition is met, the current load parameter is retrieved from the air compressor control system, and is divided into low load ≤ 30%, medium load 30%-70%, and high load ≥ 70% according to the ratio of actual output power to rated power, and the concentration change rate corresponding to the current oil gas concentration is calculated. If the current load is low and the concentration change rate is ≤ 0.3 mg / (m³·min), the gradual switching mode is triggered; if the current load is medium and 0.3 mg / (m³·min) < concentration change rate ≤ 0.6 mg / (m³·min), the accelerated switching mode is triggered; if the current load is high or the concentration change rate > 0.6 mg / (m³·min), the emergency switching mode is triggered, ensuring that the switching mode is accurately matched with the current working condition risk level. When the gradual switching mode is triggered, the number of regulation stages is set to 3-4, and the opening amplitude of each stage is distributed according to the principle of small amplitude increment. For example, the target inlet opening amplitude is adjusted to 20%-30% in the initial stage, maintained for 5-8 minutes to ensure slow increase of the inlet air volume; the target inlet opening amplitude is adjusted to 50%-60% in the second stage, maintained for 3-5 minutes to further smoothly transition; the target inlet opening amplitude is adjusted to 80%-90% in the third stage, maintained for 2-3 minutes; and the target inlet opening amplitude is finally adjusted to 100% rated opening amplitude to complete the switching. The duration and amplitude of each stage can be calibrated according to the regulation effect in the low-risk working condition in the historical database, to avoid sudden changes in the air volume of the air compressor caused by too fast regulation.

[0043] Further, when the accelerated switching mode is triggered, the amplitude strategy of a few stages with fast regulation is matched: the number of regulation stages is set to 2-3, and the opening amplitude of each stage is distributed according to the principle of medium amplitude increment. For example, the target inlet opening amplitude is adjusted to 40%-50% in the initial stage, maintained for 2-4 minutes to quickly establish a basic inlet air volume; the target inlet opening amplitude is adjusted to 70%-80% in the second stage, maintained for 1-3 minutes to shorten the transition time; and if a third stage is needed, the target inlet opening amplitude is directly adjusted to 100% rated opening amplitude to complete the switching. This strategy is faster than the gradual mode in reaching the target state on the premise that the change in the inlet air volume does not exceed the tolerance range of the air compressor, is suitable for working conditions with medium rate of concentration increase, and avoids further accumulation of risks. When the emergency switching mode is triggered, the amplitude strategy of single-stage or two-stage fast regulation is matched: if the risk is extremely high, the number of regulation stages is set to 1, and the target inlet opening amplitude is directly adjusted to 100% rated opening amplitude, while the original inlet is quickly closed to 0%; if the risk is relatively high but a slight transition is needed, the number of regulation stages is set to 2, the target inlet opening amplitude is adjusted to 60%-70% in the initial stage, maintained for 1-2 minutes, and the target inlet opening amplitude is directly adjusted to 100% in the second stage, while the original inlet is simultaneously closed. This strategy quickly cuts off the high oil gas concentration inlet to the greatest extent to reduce the risk of oil leakage.

[0044] S105, based on the air inlet switching strategy and the air inlet amplitude adjustment strategy, the three-way valve arranged on the air inlet pipeline is regulated and controlled to realize air inlet regulation and control of the air compressor; wherein the three-way valve is arranged after the oil-gas concentration sensor.

[0045] In an implementation manner of the present application, the driving signals corresponding to the air inlet switching strategy and the air inlet amplitude adjustment strategy are sent to the supercharged air inlet end corresponding to the three-way valve, and the driving signals corresponding to the air inlet switching strategy and the air inlet amplitude adjustment strategy are sent to the naturally aspirated air inlet end corresponding to the three-way valve. Based on the driving signals, the opening degrees of the supercharged air inlet end and the naturally aspirated air inlet end in different adjustment stages are complementary.

[0046] Specifically, the determined air inlet switching strategy and air inlet amplitude adjustment strategy are converted into driving signal parameters recognizable by the three-way valve. For example, if the switching strategy is switched from supercharged air inlet to naturally aspirated air inlet, and the amplitude strategy is 3-stage gradual adjustment, the target driving current parameters of each stage of the naturally aspirated air inlet end and the target driving parameters of the supercharged air inlet end are converted to ensure that the driving signal parameters are accurately matched with the opening degree requirements of the adjustment strategy. Further, through the signal connection line between the air compressor control system and the supercharged air inlet end of the three-way valve, the driving signal is sent in stages according to the analyzed driving parameters. Synchronously, based on the analyzed driving parameters, the driving signal is sent in stages through the signal line between the control system and the naturally aspirated air inlet end of the three-way valve, and the opening degree corresponding to the signal and the supercharged air inlet end are complementary, ensuring the stability of the total air intake of the air inlet pipeline. For example, in the first stage of switching, the driving signal corresponding to 20% opening degree is sent to the naturally aspirated air inlet end, which is complementary to the 80% opening degree of the supercharged air inlet end; in the second stage, the driving signal of 60% opening degree is sent, which is complementary to the 40% opening degree of the supercharged air inlet end; in the third stage, the driving signal of 100% opening degree is sent, which is complementary to the 0% opening degree of the supercharged air inlet end. The driving signal sending time of each stage is synchronized with the supercharged air inlet end, ensuring that the opening degree adjustment of both ends is carried out coordinately.

[0047] Further, in the driving signal sending process, the actual opening degree data of the supercharged air inlet end and the naturally aspirated air inlet end are collected in real time through the opening degree detection assembly of the three-way valve and transmitted to the air compressor control system. The control system compares the collected actual opening degree data with the target complementary opening degree value, and if the deviation of the sum of the actual opening degrees of both ends from the target complementary value in a certain stage is > 5%, a calibration driving signal is immediately sent to the end with larger deviation. Through real-time monitoring and calibration, it is ensured that the opening degrees of both ends always change complementarily in the whole adjustment process, avoiding air intake fluctuation caused by factors such as valve core wear and signal interference.

[0048] In one implementation of this application, when the oil-gas concentration in the engine intake manifold meets a preset normal threshold range, but the air compressor still leaks oil, the air compressor is kept in its rated operating state, and multi-dimensional detection data corresponding to the air compressor is collected within a preset time period. The multi-dimensional detection data includes at least one of oil-gas related data and boost-related data. A fault feature analysis model is constructed based on the multi-dimensional detection data. If the obtained detection data conforms to a first fault determination logic, the fault source is determined to be an abnormality in the oil-gas separation component. The first fault determination logic is that the difference between the oil-gas related data is greater than a preset difference threshold, and all boost-related data are within a preset rated range. If the obtained detection data conforms to a second fault determination logic, the fault source is determined to be an abnormality in the boost-pressure component. The second fault determination logic is that the difference between the oil-gas related data is not greater than a preset difference threshold, and the value of any item in the boost-related data is greater than a preset rated range.

[0049] Specifically, an oil-gas concentration sensor installed in the engine intake manifold continuously monitors the current oil-gas concentration in the intake manifold to determine if it is within a preset normal threshold range. If the concentration is within the normal threshold range, but oil leakage still occurs at the air compressor outlet, it is determined to be an abnormal scenario of normal concentration but oil leakage, requiring the initiation of the fault source location process. After confirming the abnormal scenario, the air compressor is controlled to maintain its rated operating state, and a multi-dimensional data acquisition program is initiated.

[0050] Furthermore, the collected multi-dimensional detection data includes at least the intake manifold oil-gas concentration, the oil-gas concentration at the outlet of the oil-gas separator, the fluid parameters at the outlet of the booster, the operating parameters of the booster, and the air compressor oil leakage status parameters. If the detection data meets the fault determination logic for the oil-gas separator, the fault source is determined to be an abnormality in the oil-gas separator. The fault determination logic for the oil-gas separator is as follows: the difference between the oil-gas concentration in the intake manifold and the oil-gas concentration at the outlet of the oil-gas separator exceeds a preset concentration difference threshold, and the fluid parameters and operating parameters associated with the booster are all within the preset rated range. If the detection data meets the fault determination logic for the booster, the fault source is determined to be an abnormality in the booster. The fault determination logic for the booster is as follows: the difference between the oil-gas concentration in the intake manifold and the oil-gas concentration at the outlet of the oil-gas separator is within a preset normal difference range, and at least one of the fluid parameters and operating parameters associated with the booster deviates from the corresponding preset range, or the deviation of the air compressor oil leakage status parameters from the standard parameters exceeds a preset deviation threshold.

[0051] Figure 3 This is a schematic diagram of the structure of an air compressor intake control device provided in an embodiment of this application. Figure 3The air compressor intake control device is shown, comprising: at least one processor; and a memory in communication with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to: compare the oil gas concentration with a preset oil gas concentration threshold, and determine an air inlet switching strategy based on the comparison result; input the air compressor operating condition and the oil gas concentration into a preset oil leakage detection model to obtain an oil leakage prediction result; match different air inlet amplitude adjustment strategies based on the oil leakage prediction result; and based on the air inlet switching strategy and the air inlet amplitude adjustment strategy, control a three-way valve arranged on an air inlet pipeline to realize air compressor intake control; wherein the three-way valve is arranged after an oil gas concentration sensor.

[0052] The non-volatile computer storage medium provided by the embodiments of the present application stores computer executable instructions, and the computer executable instructions are configured to: compare the oil gas concentration with a preset oil gas concentration threshold, and determine an air inlet switching strategy based on the comparison result; input the air compressor operating condition and the oil gas concentration into a preset oil leakage detection model to obtain an oil leakage prediction result; match different air inlet amplitude adjustment strategies based on the oil leakage prediction result; and based on the air inlet switching strategy and the air inlet amplitude adjustment strategy, control a three-way valve arranged on an air inlet pipeline to realize air compressor intake control; wherein the three-way valve is arranged after an oil gas concentration sensor.

[0053] Each of the embodiments in the present application is described in a progressive manner, and the same or similar parts of each of the embodiments can be referred to each other. Each of the embodiments focuses on the difference from other embodiments. In particular, for the device, equipment, and non-volatile computer storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0054] The above only describes the embodiments of the present application and is not intended to limit the present application. The embodiments of the present application can be variously changed and modified by those skilled in the art. The modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for regulating the intake air of an air compressor, characterized in that, The method includes: The oil and gas concentration in the intake manifold is obtained by using an oil and gas concentration sensor installed in the engine intake manifold. The oil and gas concentration is compared with a preset oil and gas concentration threshold, and an air inlet switching strategy is determined based on the comparison result. The operating conditions of the air compressor and the oil-gas concentration are input into a preset oil leakage detection model to obtain oil leakage prediction results; Based on the oil leak prediction results, different air inlet amplitude adjustment strategies are matched; Based on the inlet switching strategy and the inlet amplitude adjustment strategy, the three-way valve installed on the inlet pipeline is regulated to achieve air compressor intake regulation; wherein, the three-way valve is installed after the oil-gas concentration sensor.

2. The air compressor intake control method according to claim 1, characterized in that, The step of comparing the oil and gas concentration with a preset oil and gas concentration threshold and determining the inlet switching strategy based on the comparison result specifically includes: When the oil and gas concentration is not greater than the preset oil and gas concentration threshold, the determined air inlet switching strategy is boosted air intake; When the oil and gas concentration is greater than the preset oil and gas concentration threshold, the determined intake switching strategy is natural intake, and a fault code alarm is issued.

3. The air compressor intake control method according to claim 1, characterized in that, Before comparing the oil and gas concentration with a preset oil and gas concentration threshold, the method further includes: An initial margin coefficient is set based on the air compressor's operating time; Based on the historical database corresponding to the air compressor and the components corresponding to the air compressor, the set of operating parameters corresponding to different components is obtained. Based on the differences between each set of operating parameters and the corresponding target parameter set, and the importance of each component, the control coefficient is obtained. Based on the control coefficient and the initial margin coefficient, the initial oil and gas concentration threshold is adjusted to obtain the preset oil and gas concentration threshold.

4. The air compressor intake control method according to claim 1, characterized in that, Before inputting the air compressor operating conditions and the oil-gas concentration into the preset oil leak detection model, the method further includes: The system acquires historical oil leakage event data corresponding to the air compressor, and categorizes the oil leakage event data by preset operating condition dimensions to construct a multi-dimensional historical database. The preset operating condition dimensions include at least one of the following: load level, environmental parameters, and equipment aging degree. Based on the oil leak event data, a historical oil and gas concentration time series curve is constructed, and the oil leak occurrence time and corresponding operating parameters are marked in the historical oil and gas concentration time series curve. Based on the multi-dimensional historical database, feature extraction is performed on the time-series curves of oil and gas concentrations under the same label category to obtain concentration change features; wherein, the concentration change features include at least one of concentration change rate, concentration fluctuation entropy value and concentration curvature. Based on the time of oil leakage and the characteristics of concentration change, the preset oil leakage detection model is constructed.

5. The air compressor intake control method according to claim 4, characterized in that, The step of inputting the air compressor operating conditions and the oil-gas concentration into a pre-set oil leak detection model to obtain oil leak prediction results specifically includes: Obtain the current operating oil and gas concentration time-series data and current operating parameters corresponding to the air compressor; Based on the current operating oil and gas concentration time series data and current operating parameters, the corresponding tag classification is matched in the historical database; Based on the label classification, the preset oil leak detection model is invoked to output multiple continuous time intervals and the corresponding oil leak probability for each time interval, thereby obtaining the oil leak prediction result.

6. The air compressor intake control method according to claim 1, characterized in that, The matching of different air intake amplitude adjustment strategies based on the oil leak prediction results specifically includes: When the oil leak prediction result meets the control conditions, a corresponding switching mode is triggered based on the air compressor load parameters and the concentration change rate corresponding to the oil and gas concentration; wherein, the switching mode includes at least one of the following: gradual switching mode, accelerated switching mode, and emergency switching mode. Based on the switching mode, a corresponding air intake amplitude adjustment strategy is matched; wherein, the air intake amplitude adjustment strategy includes at least the number of adjustment stages and the opening amplitude corresponding to each adjustment stage.

7. The air compressor intake control method according to claim 1, characterized in that, The regulation of the three-way valve installed on the intake pipeline based on the intake port switching strategy and the intake port amplitude adjustment strategy specifically includes: Send drive signals corresponding to the intake port switching strategy and the intake port amplitude adjustment strategy to the booster intake port corresponding to the three-way valve; In addition, drive signals corresponding to the air inlet switching strategy and the air inlet amplitude adjustment strategy are sent to the natural air intake end corresponding to the three-way valve. Based on the driving signal, the opening degrees of the boost intake end and the natural intake end change in a complementary manner at different adjustment stages.

8. The air compressor intake control method according to claim 1, characterized in that, After obtaining the fuel-air concentration corresponding to the intake manifold through a fuel-air concentration sensor installed in the engine intake manifold, the method further includes: When the oil-gas concentration in the engine intake manifold meets the preset normal threshold range, but the air compressor still leaks oil, the air compressor is kept in rated operating condition, and multi-dimensional detection data corresponding to the air compressor is collected within a preset time period; wherein, the multi-dimensional detection data includes at least one of oil-gas related data and boosting related data; A fault feature analysis model is constructed based on the multi-dimensional detection data. If the detection data obtained by the fault feature analysis model conforms to the first fault determination logic, the fault source is determined to be an abnormality of the oil-gas separation component. The first fault determination logic is that the difference between the oil-gas related data is greater than a preset difference threshold, and the boosting related data are all within a preset rated range. If the obtained detection data conforms to the second fault determination logic, the fault source is determined to be an abnormality of the booster component; wherein, the second fault determination logic is that the difference between the oil and gas related data is not greater than the preset difference threshold, and the data value of any item in the booster related data is greater than the preset rated range.

9. An air compressor intake control device, characterized in that, The device includes a memory for storing computer program instructions and a processor for executing the program instructions, wherein when the computer program instructions are executed by the processor, the device is triggered to perform the method described in any one of claims 1-8.

10. A non-volatile computer storage medium storing computer-executable instructions, characterized in that, The computer-executable instructions are capable of performing the method described in any one of claims 1-8.

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