Hybrid engine air filtration system and control method thereof

Abstract

The present invention provides a hybrid engine air filtration system and a control method thereof. The air filtration system includes an air filter, a monitoring unit, an alarm unit and a back-blowing unit, wherein the air filter includes a primary air filter and a secondary air filter that are connected to each other, and the back-blowing unit is used to spray compressed gas into the primary air filter and the secondary air filter. The control method includes obtaining the engine startup time, obtaining the air pressure difference on both sides of the air filter based on the engine startup time, and monitoring the dust concentration in the vehicle environment in real time, dynamically adjusting the back-blowing duration and back-blowing interval according to the actual dust concentration and air pressure difference, and replacing the filter element according to the filter element usage time, thereby avoiding unnecessary frequent back-blowing, thereby improving the overall efficiency of the system, saving energy and reducing waste.

Description

Technical Field

[0001] The present invention relates to the field of air filtration systems, and in particular to a hybrid engine air filtration system and a control method thereof. Background Art

[0002] Air filtration systems play a vital role in modern engines, especially in hybrid engine applications. The main function of the air filter is to remove dust, particulate matter and other pollutants contained in the air entering the engine to protect the engine from wear and damage. Efficient air filtration not only helps to extend the service life of the engine, but also improves fuel efficiency and reduces emissions.

[0003] Currently, traditional air filtration systems need to be dusted or replaced with new filter elements after being used for a period of time to ensure the filtration effect. This method is rather troublesome.

[0004] To address this issue, some existing fuel-powered vehicles perform timed backflushing operations on the air filtration system. However, these systems operate primarily based on experience and preset schedules, lacking the ability to monitor actual operating conditions in real time and dynamically adjust. Most traditional systems set fixed backflushing intervals, regardless of changing environmental conditions. This can lead to unnecessary frequent backflushing or insufficient backflushing, resulting in energy waste or poor cleaning effects, affecting the filtration effectiveness of the air filter and, consequently, engine performance. Summary of the Invention

[0005] The purpose of the present invention is to provide a hybrid engine air filtration system and a control method thereof. To solve the above problems, the present invention is achieved through the following technical solutions:

[0006] A hybrid engine air filtration system includes an air filter, a monitoring unit, an alarm unit and a backflush unit, wherein the air filter includes a primary air filter and a secondary air filter that are connected to each other, and the backflush unit is used to spray compressed gas into the primary air filter and the secondary air filter.

[0007] According to a further technical solution, both the primary air filter and the secondary air filter are provided with detachable filter elements.

[0008] According to a further technical solution, the monitoring unit includes a dust concentration monitoring component, an air pressure difference monitoring component and an engine monitoring component.

[0009] According to a further technical solution, the back-blowing unit includes an air storage component and a back-blowing control component, and the air storage component is used to store part of the air filtered by the primary air filter and the secondary air filter.

[0010] A control method for a hybrid engine air filtration system is provided. The control method is based on the above-mentioned hybrid engine air filtration system and includes the following steps:

[0011] S100, obtaining and determining the relationship between the engine startup time t and a preset startup time threshold t0;

[0012] S200 , if t≥t0, obtaining the air pressure difference ΔP on both sides of the air filter and the dust concentration C of the vehicle environment, and adjusting the backflush duration T and the backflush interval t1 based on a preset adjustment strategy.

[0013] Further technical solution, the preset adjustment strategy is specifically:

[0014] Retrieve the first threshold value P1 and the second threshold value P2 stored in the database, where P1 < P2, and determine the magnitude relationship between ΔP, P1, and P2 accordingly:

[0015] If ΔP<P1, then enter S211; if P1≤ΔP<P2, then enter S212; if ΔP≥P2, then enter S213;

[0016] S211. Determine the backflush duration T and the backflush interval t1 according to the dust concentration C and the air pressure difference ΔP:

[0017] T=k t *(ΔP) α *(C) β ;

[0018] t1=k1*C n ;

[0019] Where k t is the backwash time proportional coefficient, α is the air pressure difference index factor, β is the dust concentration index factor, k1 is the backwash interval proportional coefficient, n is the dust concentration index factor, and n<0;

[0020] The backflush unit performs backflush at a backflush pulse frequency of 10 times per second, and returns to S100 after the backflush work is completed;

[0021] S212, the backflush unit performs backflush operation at a backflush pulse frequency of 15 times per second until ΔP < P1, and returns to S211;

[0022] S213: The alarm unit prompts shutdown.

[0023] As a further technical solution, the backflush pulse frequency in S211 and S212 is dynamically adjusted according to the current usage time of the filter element.

[0024] A further technical solution is to obtain a preset threshold of the total cumulative engine operating time since the last filter element replacement and a threshold of the current filter element usage time;

[0025] Get the total cumulative engine operating time since the last filter element replacement, as well as the current filter element usage time;

[0026] Compare the total accumulated engine operating time after the last filter element replacement and the current filter element usage time with the preset total accumulated engine operating time threshold after the last filter element replacement and the current filter element usage time threshold respectively;

[0027] If the total cumulative operating time of the engine after the last filter element replacement exceeds the total cumulative operating time threshold of the engine after the last filter element replacement, or the current filter element usage time exceeds the current filter element usage time threshold, a prompt to replace the filter element is issued.

[0028] According to a further technical solution, the current filter element usage time threshold is determined based on altitude, air humidity and temperature.

[0029] According to a further technical solution, if t<t0, the backflush unit does not work and the process returns to S100.

[0030] In summary, the present invention has the following beneficial effects:

[0031] 1. Ability to dynamically adjust backflushing parameters: By real-time monitoring of air pressure difference and dust concentration, the system can dynamically adjust the backflushing duration and backflushing interval according to actual conditions, set the appropriate backflushing pulse frequency, and make the backflushing operation more accurate and effective, ensuring that each backflushing operation can effectively remove dust from the filter element, avoiding unnecessary frequent backflushing, thereby reducing the frequency of filter element replacement, improving the overall efficiency of the system, saving energy and reducing waste, and avoiding backflushing operations when not needed, thereby extending the service life of the filter element and reducing material costs.

[0032] 2. The system dynamically adjusts the filter replacement time according to the engine's operating hours and environmental factors to ensure that the filter works in the best condition, avoid failure due to excessive use, and adapt to the climatic conditions and working environment in different regions.

[0033] 3. It can monitor the air pressure difference in real time and issue an alarm when it reaches a certain threshold, reminding the driver or maintenance personnel to take timely measures to avoid system failure caused by severe blockage.

[0034] 4. Through timely and effective back-blowing operations, the system can maintain a stable intake pressure, ensuring that the engine always works in the best condition, thereby improving the vehicle's power performance and fuel economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 It is a schematic diagram of the control method of this application. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto. The technical solutions in the examples of the present application are clearly and completely described. Obviously, the described examples are only part of the examples of the present application, not all of the examples. Based on the examples in the present application, all other examples obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, the terms "first," "second," and so on, used in this application are for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0040] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0042] Combined with attachment Figure 1 The figure shows a hybrid engine air filtration system and its control method. A hybrid engine air filtration system includes an air filter, a monitoring unit, an alarm unit and a back-blowing unit, wherein the air filter adopts a double-layer filtration design, including a primary air filter and a secondary air filter connected to each other. The primary air filter is used for primary filtration of the air, and the secondary air filter is used for secondary filtration of the air. The primary filtration can remove most of the particulate impurities, and the secondary filtration can improve the filtration effect, ensuring that the air entering the engine or the range-extended engine reaches the optimal cleanliness.

[0043] Removable filter elements are provided in the primary air filter and the secondary air filter.

[0044] Specifically, in order to simplify the maintenance process and improve work efficiency, the primary filter and the secondary filter are equipped with quickly removable filter elements. The primary air filter and the secondary air filter can be opened, such as installing the filter elements in the primary air filter and the secondary air filter, and then using bolts to install the primary air filter cover and the secondary air filter cover on the primary air filter and the secondary air filter respectively.

[0045] In one embodiment, a snap-fit ​​structure can be used between the primary air filter cover and the secondary air filter cover and the primary air filter and the secondary air filter to achieve quick assembly.

[0046] The detachable filter element design can facilitate operators to regularly clean or replace the filter element and check the primary air filter or the secondary air filter. The snap-on structure or the bolt-fixed structure of the primary air filter cover and the secondary air filter cover can reduce downtime and ensure the continuous and efficient operation of the coal pan car.

[0047] The monitoring unit includes a dust concentration monitoring component, an air pressure difference monitoring component and an engine monitoring component.

[0048] The dust concentration monitoring component includes at least two high-precision dust concentration sensors, which detect the dust concentration in the vehicle's surrounding environment in real time and provide concentration data for subsequent backflushing operations. The dust concentration data is the average value of the data obtained by multiple dust concentration sensors.

[0049] The air pressure differential monitoring component includes an air pressure differential gauge. The air pressure differential gauge uses a high-precision pressure sensor and is installed on both sides of the filtration system to accurately measure the pressure difference between the inlet and outlet gases, which serves as an important reference for evaluating the degree of filter element blockage.

[0050] The engine monitoring component includes an engine sensor for monitoring the engine's startup status and obtaining startup duration data.

[0051] The back-blowing unit is used for blowing compressed gas toward the primary air filter and the secondary air filter.

[0052] The back-blowing unit includes an air storage component and a back-blowing control component. The air storage component includes an air storage tank for storing part of the air filtered by the primary air filter and the secondary air filter to ensure that there is sufficient air source support for the back-blowing process.

[0053] The backflush control component is an intelligent backflush controller that integrates components such as solenoid valves and timers. It automatically controls the backflush frequency and intensity according to system settings to achieve effective backflush cleaning of the filter element.

[0054] A control method for a hybrid engine air filtration system is provided. The control method is based on the above-mentioned hybrid engine air filtration system and includes the following steps:

[0055] S100, obtaining and determining a relationship between the engine startup time t and a preset startup time threshold t0;

[0056] S200 , if t≥t0, obtaining the air pressure difference ΔP on both sides of the air filter and the dust concentration C of the vehicle environment, and adjusting the backflush duration T and the backflush interval t1 based on a preset adjustment strategy.

[0057] Further technical solution, the preset adjustment strategy is specifically:

[0058] Retrieve the first threshold value P1 and the second threshold value P2 stored in the database, where P1 < P2, and determine the magnitude relationship between ΔP, P1, and P2 accordingly:

[0059] If ΔP<P1, then enter S211; if P1≤ΔP<P2, then enter S212; if ΔP≥P2, then enter S213;

[0060] S211. Determine the backflush duration T and the backflush interval t1 according to the dust concentration C and the air pressure difference ΔP:

[0061] T=k t *(ΔP) α *(C) β ;

[0062] t1=k1*C n ;

[0063] Where k t is the backwash time proportional coefficient, α is the air pressure difference index factor, β is the dust concentration index factor, k1 is the backwash interval proportional coefficient, n is the dust concentration index factor, and n<0;

[0064] The backflush unit performs backflush at a backflush pulse frequency of 10 times per second, and returns to S100 after the backflush work is completed;

[0065] S212, the backflush unit performs backflush operation at a backflush pulse frequency of 15 times per second until ΔP < P1, and returns to S211;

[0066] S213: The alarm unit prompts shutdown.

[0067] As a further technical solution, the backflush pulse frequency in S211 and S212 is dynamically adjusted according to the current usage time of the filter element.

[0068] A further technical solution is to obtain a preset threshold of the total cumulative engine operating time since the last filter element replacement and a threshold of the current filter element usage time;

[0069] Get the total cumulative engine operating time since the last filter element replacement, as well as the current filter element usage time;

[0070] Compare the total accumulated engine operating time after the last filter element replacement and the current filter element usage time with the preset total accumulated engine operating time threshold after the last filter element replacement and the current filter element usage time threshold respectively;

[0071] If the total cumulative operating time of the engine after the last filter element replacement exceeds the total cumulative operating time threshold of the engine after the last filter element replacement, or the current filter element usage time exceeds the current filter element usage time threshold, a prompt to replace the filter element is issued.

[0072] According to a further technical solution, the current filter element usage time threshold is determined based on altitude, air humidity and temperature.

[0073] According to a further technical solution, if t<t0, the backflush unit does not work and the process returns to S100.

[0074] The method of replacing the filter element is to replace the filter element in the secondary air filter into the primary filter, and replace the new filter element in the secondary filter to avoid waste. Because the secondary filter element is relatively clean, it can be placed in the primary filter for initial filtration.

[0075] The specific control method embodiment steps are as follows:

[0076] The control method of this embodiment is applied to a coal-carrying vehicle using a hybrid engine.

[0077] S100: Obtain and determine the relationship between the engine startup time t and a preset startup time threshold t0.

[0078] The startup time threshold can be set to t0 = 5 minutes. If it is less than 5 minutes, it is judged as a short startup and the backflush unit does not work.

[0079] The engine sensor monitors the current engine startup time t in real time. For example, when t=4 minutes, t<t0, that is, the engine startup time is less than 5 minutes, the backflush unit does not work, and the engine sensor continues to monitor the engine startup time.

[0080] For short-time startup, i.e., t<t0, the system records it as a short-time startup. Considering that no significant dust accumulation will occur in a short time, the backflush function is not activated to save energy and protect the equipment.

[0081] If t≥t0, for example, when t=10 minutes, that is, the engine startup time is greater than or equal to 5 minutes, the system obtains the air pressure difference ΔP on both sides of the air filtration system through the air pressure difference sensor, and obtains the current environmental dust concentration C through the dust concentration sensor.

[0082] S200 , retrieving threshold values: The first threshold value P1 and the second threshold value P2 of the air pressure difference are stored in the system database. For example, in the database, the first threshold value P1 of the air pressure difference is 1500 Pa, and the second threshold value P2 is 3000 Pa.

[0083] 3. Make conditional judgments:

[0084] If ΔP<P1, go to S211;

[0085] If P1≤ΔP<P2, then go to S212;

[0086] If ΔP ≥ P2, proceed to S213.

[0087] S211, minor congestion;

[0088] 1. Adjust the backflush interval time t1 according to the formula t1=k1*C n , set k1 = 120 minutes, n = -0.5, calculate the backflush interval time under different dust concentrations:

[0089] Low dust concentration, for example, C is 5mg / m 3 ,t1=120*5 -0.5 ≈53.64 minutes;

[0090] Medium dust concentration, for example, C is 10 mg / m 3 ,t1=120*20 -0.5 ≈37.92 minutes;

[0091] High dust concentration, for example, C is 20 mg / m 3 ,t1=120*20 -0.5 ≈26.88 minutes.

[0092] 2. Adjust the backflush duration T: According to the formula T=k t *(ΔP) α *(C) β , set k t =0.05, α=0.7, β=0.5, and the backflush duration under different air pressure differences and dust concentrations was calculated.

[0093] For example, under low dust concentration, for example, the dust concentration C is 5mg / m 3 For the sake of convenience, the air pressure difference ΔP is taken as 1200Pa: At this time, T≈0.05*(1200) 0.7 * (5) 0.5 ≈30.04 seconds;

[0094] Medium dust concentration, for example, C is 10 mg / m 3 , when ΔP=1200Pa, T≈0.05*(1200) 0.7 * (10) 0.5 ≈42.53 seconds;

[0095] High dust concentration, for example, C is 20 mg / m 3 , when ΔP=1200Pa, T≈0.05*(1200) 0.7 * (20) 0.5 ≈60.08 seconds;

[0096] Under the three dust concentrations of high, medium and low, the backflush unit performs backflush at a backflush pulse frequency of 10 times per second until the calculated backflush duration T is reached, and then returns to S100.

[0097] S212, medium blockage treatment;

[0098] For example, if ΔP=1600Pa, which is greater than P1 of 1500Pa, the backflush unit will backflush at a backflush pulse frequency of 15 times per second until the air pressure difference ΔP drops below P1, and then returns to S211.

[0099] S213, severe congestion alarm;

[0100] The alarm prompts, ΔP≥P2, that is, the air pressure difference ΔP is greater than the set second threshold value P2. For example, when the air pressure difference = 3200Pa, it is greater than the second threshold value of 3000Pa, triggering the alarm unit to prompt the driver or maintenance personnel to stop the machine and check the filter element.

[0101] The back-blowing pulse frequency in S211 and S212 is dynamically adjusted according to the current usage time of the filter element. For example, the back-blowing pulse frequency increases according to the increase in the usage time of the current filter element. When the filter element is used for a long time, the back-blowing pulse frequency can be appropriately increased in S211 and S212. For example, in S211, the back-blowing pulse frequency is increased to 12 times per second, and in S212, the back-blowing pulse frequency is increased to 17 times per second.

[0102] S300, filter replacement time threshold adjustment;

[0103] Record the total engine operating hours since the last filter element replacement and the current filter element usage time.

[0104] Pre-set thresholds:

[0105] For example, the threshold for the total engine operating time after the last filter element replacement is set to 500 hours, and the threshold for the current filter element usage time is set to 2 months.

[0106] Judgment conditions:

[0107] If any threshold is exceeded, the central control system will prompt you to replace the filter element. Specifically: if the total cumulative working time of the engine after the last filter element replacement exceeds the total cumulative working time threshold of the engine after the last filter element replacement, or the current filter element usage time exceeds the current filter element usage time threshold, the central control system will alarm and prompt you to replace the filter element.

[0108] Consider environmental factors to adjust the current filter usage time threshold:

[0109] The current filter usage time threshold can be dynamically adjusted according to altitude, air humidity and temperature.

[0110] Impact of altitude on the current filter usage threshold: As altitude increases, air density decreases, and filters may need to be replaced more frequently. In this case, the current filter usage threshold is lowered.

[0111] The impact of air humidity on the current filter usage threshold: In a high humidity environment, the filter is more likely to clog, requiring a shorter replacement cycle. In this case, the current filter usage threshold should be lowered.

[0112] Impact of temperature on the current filter usage threshold: Under extreme temperature conditions, filter performance may deteriorate, requiring appropriate adjustment of replacement schedules. In this case, the current filter usage threshold should be lowered.

[0113] Therefore, through intelligent monitoring and dynamic adjustments, the system can adjust the backflush interval and duration according to actual operating conditions, and rationally adjust the filter replacement time, thereby extending filter life, reducing maintenance costs, and improving overall system reliability. Subsequent system optimization and improvement will ensure stable operation in various environments and meet user needs.

[0114] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand and implement the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A control method for a hybrid engine air filtration system, characterized in that: The air filtration system includes an air filter, a monitoring unit, an alarm unit and a backflush unit, wherein the air filter includes a primary air filter and a secondary air filter that are connected to each other, and the backflush unit is used to spray compressed gas into the primary air filter and the secondary air filter; The control method includes the following steps: S100, obtaining and determining the relationship between the engine startup time t and a preset startup time threshold t0; S200, if t≥t0, obtaining the air pressure difference ΔP on both sides of the air filter and the dust concentration C in the vehicle environment, and adjusting the backflush duration T and the backflush interval t1 based on a preset adjustment strategy; The preset adjustment strategy is specifically: Retrieve the first threshold value P1 and the second threshold value P2 stored in the database, where P1 < P2, and determine the magnitude relationship between ΔP, P1, and P2 accordingly: If ΔP<P1, then enter S211; if P1≤ΔP<P2, then enter S212; if ΔP≥P2, then enter S213; S211. Determine the backflush duration T and the backflush interval t1 according to the dust concentration C and the air pressure difference ΔP: T=k t *(ΔP) α *(C) β ; t1=k1*C n ; Where k t is the backwash time proportional coefficient, α is the air pressure difference index factor, β is the dust concentration index factor, k1 is the backwash interval proportional coefficient, n is the dust concentration index factor, and n<0; The backflush unit performs backflush at a backflush pulse frequency of 10 times per second, and returns to S100 after the backflush work is completed; S212, the backflush unit performs backflush operation at a backflush pulse frequency of 15 times per second until ΔP < P1, and returns to S211; S213: The alarm unit prompts shutdown.

2. The control method of a hybrid engine air filtration system according to claim 1, characterized in that: The primary air filter and the secondary air filter are both provided with detachable filter elements; the control method also includes dynamically adjusting the backflush pulse frequency in S211 and S212 according to the current usage time of the filter element.

3. The control method of a hybrid engine air filtration system according to claim 1, characterized in that: Get the preset threshold of the total engine operating time after the last filter replacement and the current filter usage time threshold; Get the total cumulative engine operating time since the last filter element replacement, as well as the current filter element usage time; Compare the total accumulated engine operating time after the last filter element replacement and the current filter element usage time with the preset total accumulated engine operating time threshold after the last filter element replacement and the current filter element usage time threshold respectively; If the total cumulative operating time of the engine after the last filter element replacement exceeds the total cumulative operating time threshold of the engine after the last filter element replacement, or the current filter element usage time exceeds the current filter element usage time threshold, a prompt to replace the filter element is issued.

4. The control method of a hybrid engine air filtration system according to claim 3, characterized in that: The current filter element usage time threshold is determined based on altitude, air humidity and temperature.

5. The control method of a hybrid engine air filtration system according to claim 1, characterized in that: If t<t0, the backflush unit does not work and the process returns to S100.

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