Hybrid engine air filtering system and control method thereof

Abstract

According to the air filtering system of the hybrid engine and the control method of the air filtering system, the air filtering system comprises an air filter, a monitoring unit, an alarm unit and a back flushing unit, and the air filter comprises a first-stage air filter and a second-stage air filter which communicate with each other; the control method comprises the steps that the starting duration of the engine is obtained, the air pressure difference between the two sides of the air filters is obtained based on the starting duration of the engine, and the dust concentration of the environment where the vehicle is located is monitored in real time; the reverse blowing duration and the reverse blowing interval are dynamically adjusted according to the actual conditions of the dust concentration and the air pressure difference, the filter element is replaced according to the use duration of the filter element, and unnecessary frequent reverse blowing is avoided, so that the overall efficiency of the system is improved, energy is saved, and waste is reduced.

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] The air filtration system plays 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 filters after being used for a period of time to ensure the filtration effect, which is a rather troublesome method.

[0004] To address this problem, some existing fuel vehicle models perform timed backflushing operations on the air filtration system. However, these systems are mainly operated based on experience and preset schedules, and lack the ability to monitor and dynamically adjust actual operating conditions in real time. Most traditional systems set fixed backflushing intervals, regardless of how environmental conditions change. This may lead to unnecessary frequent backflushing or insufficient backflushing, resulting in energy waste or poor cleaning effects, affecting the filtering effect of the air filter and thus affecting 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 implemented through the following technical solutions: A hybrid engine air filtration system comprises an air filter, a monitoring unit, an alarm unit and a back-blowing unit, wherein the air filter comprises a primary air filter and a secondary air filter which are connected, and the back-blowing unit is used for spraying compressed gas to the primary air filter and the secondary air filter.

[0006] According to a further technical solution, both the primary air filter and the secondary air filter are provided with detachable filter elements.

[0007] 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.

[0008] 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.

[0009] A control method for a hybrid engine air filter system, based on the above hybrid engine air filter system, comprises 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 of the environment where the vehicle is located, and adjusting the backwash duration T and the backwash interval t1 based on a preset adjustment strategy.

[0010] In a further technical solution, the preset adjustment strategy is specifically: The first threshold value P1 and the second threshold value P2 stored in the database are retrieved, wherein P1<P2, and the magnitude relationship between ΔP, P1 and P2 is determined accordingly: If ΔP<P1, then enter S211; if P1≤ΔP<P2, then enter S212; if ΔP≥P2, then enter S213; S211, determining 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 ; In the formula, k t is the back-blowing time proportional coefficient, α is the air pressure difference index factor, β is the dust concentration index factor, k1 is the back-blowing 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.

[0011] According to a further technical solution, the back-blowing pulse frequency in S211 and S212 is dynamically adjusted according to the current usage time of the filter element.

[0012] A further technical solution is to obtain a preset threshold of the total cumulative working time of the engine after the last filter element replacement and a threshold of the current filter element usage time; 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 threshold value of the total cumulative operating time of the engine after the last filter element replacement, or the current filter element usage time exceeds the threshold value of the current filter element usage time, a prompt to replace the filter element is issued.

[0013] According to a further technical solution, the current filter element usage time threshold is determined based on altitude, air humidity and temperature.

[0014] According to a further technical solution, if t<t0, the backflush unit does not work and the process returns to S100.

[0015] In summary, the present invention has the following beneficial effects: 1. Ability to dynamically adjust backflush parameters: By real-time monitoring of air pressure difference and dust concentration, the system can dynamically adjust the backflush duration and backflush interval according to actual conditions, set the appropriate backflush pulse frequency, and make the backflush operation more accurate and effective, ensuring that each backflush operation can efficiently remove dust from the filter element, avoiding unnecessary frequent backflush, thereby reducing the frequency of filter element replacement, improving the overall efficiency of the system, saving energy and reducing waste, and avoiding backflush operations when not needed, thereby extending the service life of the filter element and reducing material costs.

[0016] 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, avoids failure due to excessive use, and adapts to the climatic conditions and working environment in different regions.

[0017] 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.

[0018] 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

[0019] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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. Figure 1 It is a schematic diagram of the control method of the present application. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the examples, but the embodiments of the present invention are not limited thereto. The technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] 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 components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] 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 the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0025] Combined with Figure 1The figure shows a hybrid engine air filtration system and a control method thereof, a hybrid engine air filtration system, including 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.

[0026] Removable filter elements are arranged in the primary air filter and the secondary air filter.

[0027] 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, and 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.

[0028] In one embodiment, the primary air filter cover and the secondary air filter cover can use a snap-on structure with the primary air filter and the secondary air filter to achieve quick assembly.

[0029] 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.

[0030] The monitoring unit comprises a dust concentration monitoring component, an air pressure difference monitoring component and an engine monitoring component.

[0031] 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 backblowing operations. The dust concentration data is the average value of the data obtained by multiple dust concentration sensors.

[0032] 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.

[0033] The engine monitoring component includes an engine sensor for monitoring the engine's startup status and obtaining startup duration data.

[0034] The back-blowing unit is used for blowing compressed gas toward the primary air filter and the secondary air filter.

[0035] 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.

[0036] 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 backflush intensity according to system settings to achieve effective backflush cleaning of the filter element.

[0037] A control method for a hybrid engine air filter system, based on the above hybrid engine air filter system, comprises the following steps: S100, obtaining and determining a magnitude 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 of the environment where the vehicle is located, and adjusting the backwash duration T and the backwash interval t1 based on a preset adjustment strategy.

[0038] In a further technical solution, the preset adjustment strategy is specifically: The first threshold value P1 and the second threshold value P2 stored in the database are retrieved, wherein P1<P2, and the magnitude relationship between ΔP, P1 and P2 is determined accordingly: If ΔP<P1, then enter S211; if P1≤ΔP<P2, then enter S212; if ΔP≥P2, then enter S213; S211, determining 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 ; In the formula, k t is the back-blowing time proportional coefficient, α is the air pressure difference index factor, β is the dust concentration index factor, k1 is the back-blowing 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.

[0039] According to a further technical solution, the back-blowing pulse frequency in S211 and S212 is dynamically adjusted according to the current usage time of the filter element.

[0040] A further technical solution is to obtain a preset threshold of the total cumulative working time of the engine after the last filter element replacement and a threshold of the current filter element usage time; 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 threshold value of the total cumulative operating time of the engine after the last filter element replacement, or the current filter element usage time exceeds the threshold value of the current filter element usage time, a prompt to replace the filter element is issued.

[0041] According to a further technical solution, the current filter element usage time threshold is determined based on altitude, air humidity and temperature.

[0042] According to a further technical solution, if t<t0, the backflush unit does not work and the process returns to S100.

[0043] 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.

[0044] The specific control method embodiment steps are as follows: The control method of this embodiment is applied to a coal truck using a hybrid engine.

[0045] S100, obtaining and determining the relationship between the start-up time t of the engine and a preset start-up time threshold t0.

[0046] 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.

[0047] 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 blowback unit does not work, and the engine sensor continues to monitor the engine startup time.

[0048] For short-time start, that is, t<t0, the system records it as a short-time start. 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.

[0049] 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 dust concentration C of the current environment through the dust concentration sensor.

[0050] S200, retrieve thresholds: The first threshold P1 and the second threshold P2 of the air pressure difference are stored in the system database. For example, in the database, the first threshold P1 of the air pressure difference is 1500Pa, and the second threshold P2 is 3000Pa.

[0051] 3. Make conditional judgment: If ΔP<P1, go to S211; If P1≤ΔP<P2, then enter S212; If ΔP≥P2, proceed to S213.

[0052] S211, slight blockage; 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: Low dust concentration, for example, C is 5mg / m 3 ,t1=120*5 -0.5 ≈53.64 minutes; Medium dust concentration, for example, C is 10 mg / m 3 ,t1=120*20 -0.5 ≈37.92 minutes; High dust concentration, for example, C is 20mg / m 3 ,t1=120*20 -0.5 ≈26.88 minutes.

[0053] 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 backwash duration under different air pressure differences and dust concentrations is calculated.

[0054] For example, at low dust concentration, for example, dust concentration C is 5 mg / m 3For 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; 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; High dust concentration, for example, C is 20mg / m 3 , when ΔP=1200Pa, T≈0.05*(1200) 0.7 * (20) 0.5 ≈60.08 seconds; 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.

[0055] S212, medium blockage treatment; 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.

[0056] S213, severe congestion alarm; 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.

[0057] 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.

[0058] S300, filter replacement time threshold adjustment; Record the total engine operating time since the last filter element replacement and the current filter element usage time.

[0059] Pre-set thresholds: For example, the total cumulative engine operating time threshold after the last filter element replacement is set to 500 hours, and the current filter element usage time threshold is set to 2 months.

[0060] Judgment conditions: If any threshold is exceeded, the central control system will prompt you to replace the filter. Specifically: if the total cumulative operating time of the engine after the last filter replacement exceeds the threshold of the total cumulative operating time of the engine after the last filter replacement, or the current filter usage time exceeds the threshold of the current filter usage time, the central control system will sound an alarm and prompt you to replace the filter.

[0061] Consider environmental factors to adjust the current filter usage time threshold: The current filter usage time threshold can be dynamically adjusted according to altitude, air humidity and temperature.

[0062] The impact of altitude on the current filter usage threshold: As the altitude increases, the air density decreases, and the filter may need to be replaced more frequently. In this case, the current filter usage threshold is lowered.

[0063] The impact of air humidity on the current filter element usage time threshold: In a high humidity environment, the filter element is more likely to be clogged and the replacement cycle needs to be shortened. In this case, the current filter element usage time threshold should be lowered.

[0064] Impact of temperature on the current filter element usage time threshold: Under extreme temperature conditions, the filter element performance may decline and the replacement time needs to be adjusted appropriately. In this case, the current filter element usage time threshold should be lowered.

[0065] Therefore, through intelligent monitoring and dynamic adjustment, the system can adjust the backflush interval and duration according to the actual working conditions, and reasonably adjust the filter element replacement time, thereby extending the filter element life, reducing maintenance costs, and improving the overall reliability of the system. The subsequent system can be continuously optimized and improved to operate stably in various environments to meet user needs.

[0066] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology in this field to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A hybrid engine air filtration system, characterized in that: It 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, and the back-blowing unit is used for spraying compressed gas to the primary air filter and the secondary air filter.

2. The 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.

3. The hybrid engine air filtration system according to claim 1, characterized in that: The monitoring unit includes a dust concentration monitoring component, an air pressure difference monitoring component and an engine monitoring component.

4. The hybrid engine air filtration system according to claim 1, characterized in that: The back-blowing unit comprises an air storage component and a back-blowing control component, wherein the air storage component is used to store part of the air filtered by the primary air filter and the secondary air filter.

5. A control method for a hybrid engine air filtration system, the control method being based on a hybrid engine air filtration system according to any one of claims 1 to 4, characterized in that: The steps include: 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 of the environment where the vehicle is located, and adjusting the backwash duration T and the backwash interval t1 based on a preset adjustment strategy.

6. The control method of a hybrid engine air filtration system according to claim 5, characterized in that: The preset adjustment strategy is specifically: The first threshold value P1 and the second threshold value P2 stored in the database are retrieved, wherein P1<P2, and the magnitude relationship between ΔP, P1 and P2 is determined accordingly: If ΔP<P1, then enter S211; if P1≤ΔP<P2, then enter S212; if ΔP≥P2, then enter S213; S211, determining 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 ; In the formula, k t is the back-blowing time proportional coefficient, α is the air pressure difference index factor, β is the dust concentration index factor, k1 is the back-blowing 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.

7. The control method of a hybrid engine air filtration system according to claim 6, characterized in that: The backflush pulse frequency in S211 and S212 is dynamically adjusted according to the current filter element usage time.

8. The control method of a hybrid engine air filtration system according to claim 5, characterized in that: Obtain the preset total engine operating time threshold after the last filter element replacement and the current filter element 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 threshold value of the total cumulative operating time of the engine after the last filter element replacement, or the current filter element usage time exceeds the threshold value of the current filter element usage time, a prompt to replace the filter element is issued.

9. The control method of a hybrid engine air filtration system according to claim 8, characterized in that: The current filter element usage time threshold is determined based on altitude, air humidity and temperature.

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

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