CN114577399B - Engine air leakage detection method and detection device - Google Patents
Engine air leakage detection method and detection device Download PDFInfo
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- CN114577399B CN114577399B CN202210057023.0A CN202210057023A CN114577399B CN 114577399 B CN114577399 B CN 114577399B CN 202210057023 A CN202210057023 A CN 202210057023A CN 114577399 B CN114577399 B CN 114577399B
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- 238000001514 detection method Methods 0.000 title claims abstract description 59
- 230000000007 visual effect Effects 0.000 claims abstract description 46
- 238000003331 infrared imaging Methods 0.000 claims description 46
- 238000003384 imaging method Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 description 24
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- 238000001931 thermography Methods 0.000 description 7
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- 238000002309 gasification Methods 0.000 description 1
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- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention relates to an engine air leakage detection method and a detection device, wherein the engine air leakage detection method comprises the following steps: acquiring the running power of an engine; acquiring a first infrared image of exhaust gas of the engine at a first visual angle and a second infrared image of the engine at a second visual angle according to the power of the engine reaching a first preset value; acquiring the infrared characteristics of the leakage of the exhaust pipe; determining engine blow-by based on either of the first infrared image and the second infrared image having an exhaust pipe blow-by infrared feature; the direction of the first visual angle and the direction of the second visual angle form a preset included angle. According to the engine air leakage detection method provided by the invention, under the specific working condition of the engine, the air leakage infrared characteristics of the exhaust pipe can be effectively identified by acquiring the first infrared image and the second infrared image, so that the accuracy of engine air leakage detection is improved, and the interference caused by the superposition of the air leakage infrared characteristics and the engine infrared characteristics on engine air leakage identification is eliminated.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an engine air leakage detection method and device.
Background
This section provides merely background information related to the present disclosure and is not necessarily prior art.
The engine leakage fault is one of three leakage faults of the engine, the technical state of the engine is poor due to the leakage fault, fault manifestations such as insufficient power occur, high-temperature gas can influence wire harnesses, sensors and even cause potential safety hazards to people. At present, the detection of the air leakage fault of the engine mainly depends on manual work, and when the engine is tested on a bench, the air leakage is detected by means of listening to sound, checking air inlet pressure, soapy water and the like, so that the problems of difficulty in detection, omission of judgment, difficulty in finding fault points and the like exist.
In the related art, the difference change between the gasification heat absorption or electrostatic ignition of the organic compound and the environmental temperature is utilized, the preliminary identification is carried out through the comparison of the front temperature difference and the rear temperature difference, then the specific infrared wavelength of the olefin gas is identified and judged by utilizing the filter disc, and an alarm logic is established. However, when the engine is operated, the temperature is higher, the temperature difference of different parts is inconsistent, the temperature change of different working conditions is larger, and compared with the environment, the temperature difference range is larger.
Disclosure of Invention
The invention aims to at least solve the problem that the air leakage detection of an engine is interfered by higher temperature when the engine is in operation. The aim is achieved by the following technical scheme:
According to a first aspect of the present invention, an engine air leakage detection method is provided, and an operation power of an engine is obtained; acquiring a first infrared image of exhaust gas of the engine at a first visual angle and a second infrared image of the engine at a second visual angle according to the power of the engine reaching a first preset value; acquiring the infrared characteristics of the leakage of the exhaust pipe; determining that the engine leaks according to either one of the first infrared image and the second infrared image having the exhaust pipe leak infrared characteristic; wherein the orientation of the first viewing angle is different from the orientation of the second viewing angle.
According to the engine air leakage detection method provided by the invention, the engine air leakage can be determined by acquiring the thermal imaging diagram of the engine when the thermal imaging diagram has the air leakage infrared characteristic. And operating the engine under a low-load working condition based on the engine operating power at a first preset value, wherein the boost pressure is smaller, the exhaust temperature of an engine exhaust pipeline is lower than that under a high-load working condition, but is higher than that under an environment, and the temperature of the engine is lower, so that the engine exhaust temperature is obviously higher than that of the environment and the engine. The infrared characteristic of exhaust pipe leakage can be clearly distinguished from the infrared characteristic of environment and the infrared characteristic of engine. Namely, under the specific running power of the engine, the air leakage infrared characteristics of the exhaust pipe can be effectively identified by acquiring the first infrared image and the second infrared image of the engine, so that the air leakage detection accuracy of the engine is improved. In addition, through obtaining the first infrared image and the second infrared image of the engine at two different angles of first angle and second angle, when either one of them has blast pipe gas leakage infrared characteristic, then confirm the engine gas leakage to eliminate the interference that gas leakage infrared characteristic and the overlapping of engine infrared characteristic caused to the engine gas leakage discernment.
In addition, the engine air leakage detection method according to the present invention may further have the following additional technical features:
In some embodiments of the invention, the engine air leakage detection method further comprises: acquiring a third infrared image of the engine at a first visual angle, a fourth infrared image of the engine at a second visual angle and a fifth infrared image of the engine at a third visual angle according to the fact that the running power of the engine reaches a second preset value; acquiring an intercooling forward air inlet air leakage infrared characteristic and an intercooling rear air inlet air leakage infrared characteristic; determining that the engine leaks according to whether the third infrared image has the intercooling forward air-intake air-leakage infrared feature, or whether the fourth infrared image has the intercooling forward air-leakage infrared feature or the intercooling post-intake air-leakage infrared feature, or whether the fifth infrared image has the intercooling post-intake air-leakage infrared feature; wherein the second preset value is greater than the first preset value, and any two of the first viewing angle, the second viewing angle and the third viewing angle are oriented differently.
In some embodiments of the invention, the first viewing angle is a viewing angle facing an exhaust side of the engine; the second viewing angle is a viewing angle of a flywheel side facing the engine; the third viewing angle is a viewing angle facing an intake side of the engine.
In some embodiments of the present invention, the exhaust pipe leakage infrared feature is set as an infrared image feature with a temperature exceeding a preset temperature; the infrared characteristic of air leakage of the air before intercooling is set as an infrared image characteristic of which the temperature is in a first temperature range; the infrared characteristic of air leakage of the air intake after intercooling is set as the infrared image characteristic of the temperature in a second temperature range.
In some embodiments of the invention, the engine air leakage detection method further comprises: and sending alarm information according to the determined engine air leakage.
In some embodiments of the present invention, after determining the engine air leakage, the engine air leakage detection method further includes: determining the leakage point position of the engine leakage; obtaining appearance characteristics of each part of the engine; and determining the leaked parts according to the positions of the leakage points and the appearance characteristics of the parts of the engine.
In some embodiments of the invention, the determining the leak location of the engine leak comprises: determining the position of the leakage point according to the first infrared image and the second infrared image; or determining the position of the leakage point according to the third infrared image, the fourth infrared image and the fifth infrared image.
A second aspect of the present invention provides an engine air leakage detection device for implementing an engine air leakage detection method, the engine air leakage detection device including: the first acquisition unit is used for acquiring the running power of the engine; the first infrared imaging unit is used for acquiring a first infrared image of the exhaust side of the engine at a first visual angle according to the fact that the power of the engine reaches a first preset value; the second infrared imaging unit is used for acquiring a second infrared image of the flywheel side of the engine at a second visual angle according to the fact that the power of the engine reaches a first preset value; the second acquisition unit is used for acquiring the leakage infrared characteristics of the exhaust pipe; the control unit is electrically connected with the first acquisition unit, the second acquisition unit, the first infrared imaging unit and the second infrared imaging unit respectively and is used for determining the engine leakage according to the fact that any one of the first infrared image and the second infrared image has the exhaust pipe leakage infrared characteristics; wherein the orientation of the first viewing angle is different from the orientation of the second viewing angle.
According to the engine air leakage detection device provided by the invention, the engine air leakage can be determined by acquiring the thermal imaging diagram of the engine when the thermal imaging diagram has the air leakage infrared characteristic. Based on the engine running power at a first preset value, the engine runs under a low-load working condition, the supercharging pressure is smaller at the moment, the exhaust temperature of an engine exhaust pipeline is lower when the exhaust temperature is in a relatively high-load working condition, but the relative environment temperature is higher, the temperature of the engine is lower, the interference of engine heat radiation on the infrared characteristics of gas leakage identified in a thermal imaging diagram can be effectively reduced, the omission judgment is avoided, and the accuracy of the gas leakage detection of the engine is improved. In addition, through obtaining the first infrared image and the second infrared image of engine at two different angles of first angle and second angle, when either of them has blast pipe gas leakage infrared characteristic, then confirm the engine gas leakage to eliminate the interference that gas leakage infrared characteristic and engine infrared characteristic coincidence caused infrared imaging discernment.
In some embodiments of the present invention, the first infrared imaging unit is further configured to obtain a third infrared image of an exhaust side of the engine at a first viewing angle according to an operation power of the engine reaching a second preset value; the second infrared imaging unit is further used for obtaining a fourth infrared image of the flywheel side of the engine at a second visual angle according to the fact that the power of the engine reaches a second preset value; the second acquisition unit is also used for acquiring the air leakage infrared characteristics of the intercooling forward air inlet and the air leakage infrared characteristics of the intercooling after air inlet;
The engine air leakage detection device further includes: the third infrared imaging unit is electrically connected with the control unit and is used for acquiring a fifth infrared image of the air inlet side of the engine at a third visual angle according to the fact that the power of the engine reaches a second preset value; the alarm device is electrically connected with the control unit; the control unit is further configured to determine that the engine leaks according to the third infrared image having the mid-cooling forward intake air leakage infrared feature, or the fourth infrared image having the mid-cooling forward intake air leakage infrared feature or the mid-cooling post-intake air leakage infrared feature, or the fifth infrared image having the mid-cooling post-intake air leakage infrared feature; the control unit is also used for controlling the alarm device to send alarm information according to the determined engine air leakage.
In some embodiments of the present invention, the range of temperature of the color patch imaging of the first infrared imaging unit matches a preset range; the temperature range of color code imaging of the second infrared imaging unit is matched with the first temperature range; the temperature range of the color code imaging of the third infrared imaging unit is matched with the second temperature range.
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Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a flowchart illustrating an engine leak detection method according to an exemplary embodiment;
FIG. 2 is a flowchart illustrating an engine leak detection method according to an exemplary embodiment;
FIG. 3 is a flowchart illustrating an engine leak detection method according to an exemplary embodiment;
FIG. 4 is a schematic diagram illustrating an engine leak detection apparatus according to an exemplary embodiment;
FIG. 5 is a schematic diagram illustrating an engine leak detection apparatus and an engine according to an exemplary embodiment;
FIG. 6 is a schematic diagram illustrating an engine leak detection apparatus and an engine according to an exemplary embodiment;
fig. 7 is a flowchart illustrating an engine leak detection method according to an exemplary embodiment.
The reference numerals are as follows:
11-first acquisition unit, 12-second acquisition unit, 13-control unit, 14-alarm device, 21-first infrared imaging unit, 22-second infrared imaging unit, 23-third infrared imaging unit, 3-engine.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Accordingly, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.
According to an embodiment of the present invention, there is provided an engine air leakage detection method, as shown in fig. 1, including the steps of:
step S101: acquiring the running power of an engine;
Step S102: acquiring a first infrared image of exhaust gas of the engine at a first visual angle and a second infrared image of the engine at a second visual angle according to the power of the engine reaching a first preset value;
Step S103: acquiring the infrared characteristics of the leakage of the exhaust pipe;
Step S104: engine blow-by is determined from either of the first infrared image and the second infrared image having an exhaust pipe blow-by infrared feature.
In this embodiment, by acquiring a thermal image of the engine, engine blow-by may be determined when the thermal image has a blow-by infrared signature. Specifically, the temperature of the engine and the engine exhaust temperature state are determined by taking the operating power of the engine. Understandably, the higher the operating power of the engine, the higher the temperature of the engine itself and the engine exhaust temperature. When the engine is running at low power, the exhaust temperature of the engine exhaust line is relatively high with respect to the ambient temperature, while the temperature of the engine is low.
The exhaust pipe leakage infrared characteristic is set to be an infrared image characteristic with the temperature exceeding the preset temperature, and because the exhaust temperatures of different engine models or different working conditions are different, the specific value of the preset temperature is required to be determined according to specific conditions by the exhaust pipe leakage infrared characteristic so as to obtain the accurate exhaust pipe leakage infrared characteristic. For example, when the engine is operated at a normal operating temperature in the range of 80 ℃ to 105 ℃ and the engine is operated at a low power, and the exhaust temperature of the engine exhaust line is greater than 200 ℃, the exhaust pipe is determined to be a gas infrared imaging image characterized by the exhaust pipe leakage infrared being greater than 200 ℃, and the preset temperature is 200 ℃. In other embodiments, the preset temperature may also be set at 240 ℃, 260 ℃, 300 ℃, etc. The ambient temperature may be in the range of-10 c to 35 c, and since the engine is similar to ambient temperature prior to start-up, the temperature of the engine ranges from ambient temperature (e.g., 10 c) to 90 c when the engine is operated at low power. The engine is operated under low load when the power of the engine reaches a first preset value, the supercharging pressure is small, the air inlet pipeline has little air leakage even if leakage points exist, when an engine exhaust pipe leaks air, the infrared characteristic of the air leakage of the exhaust pipe is a gas infrared imaging image higher than 200 ℃, and the exhaust temperature of the engine is obviously higher than the ambient temperature and the engine temperature. The infrared features of the exhaust pipe leakage can be clearly distinguished from the infrared features of the environment and the infrared features of the engine, so that the infrared features of the exhaust pipe leakage can be effectively identified by acquiring the first infrared image and the second infrared image, and the accuracy of the engine leakage detection is improved. Specifically, the first viewing angle is a viewing angle opposite to the exhaust side of the engine, the first infrared image is an engine infrared image of the exhaust side, and the first infrared image is used for acquiring the air leakage infrared characteristic of the exhaust pipe. The second visual angle is a visual angle opposite to the flywheel side of the engine, the second infrared image is an engine infrared image of the flywheel side of the engine, and the second infrared image is used for eliminating interference caused by superposition of the air leakage infrared characteristic and the engine infrared characteristic on infrared imaging identification. By acquiring a first infrared image and a second infrared image of the engine at two different angles, a blow-by of the engine is determined when either of the two has an exhaust pipe blow-by infrared feature. The engine has lower temperature under the low-load working condition, so that the interference of the heat radiation of the engine on the infrared characteristics of the air leakage identified in the thermal imaging diagram can be effectively reduced, the air leakage judgment is avoided, and the accuracy of the air leakage detection of the engine is improved. In this embodiment, when the power of the engine reaches the first preset value, the running power of the engine in the idle state is obtained.
In some embodiments of the present invention, as shown in FIG. 2, an engine air leakage detection method includes:
step S201: acquiring the running power of an engine;
Step S202: acquiring a third infrared image of the engine at the first visual angle, a fourth infrared image of the engine at the second visual angle and a fifth infrared image of the engine at the third visual angle according to the fact that the power of the engine reaches a second preset value;
step S203: acquiring an intercooling forward air inlet air leakage infrared characteristic and an intercooling rear air inlet air leakage infrared characteristic;
Step S204: and determining engine air leakage according to the fact that the third infrared image has the air leakage infrared characteristic of the air inlet before the middle cooling, or the fourth infrared image has the air leakage infrared characteristic of the air inlet before the middle cooling or the air leakage infrared characteristic of the air inlet after the middle cooling, or the fifth infrared image has the air leakage infrared characteristic of the air inlet after the middle cooling.
In this embodiment, the second preset value is greater than the first preset value, and the power of the engine reaches the second preset value, that is, the engine operates under the high load condition. The higher the operating power of the engine, the higher the temperature of the engine itself and the engine exhaust temperature. According to different working conditions of the engine, the air leakage faults are different in performance, the supercharging pressure is smaller under low load, and at the moment, even though the air inlet pipeline has leakage points, the air leakage is rarely shown. In the high-load working condition of the engine, the supercharging pressure is larger, the temperature of the air intake after supercharging is relatively higher, and the air intake leakage has obvious characteristics. The infrared image characteristic of the air leakage of the air before intercooling is set to be the infrared image characteristic of the temperature in a first temperature range; the infrared characteristic of air leakage of the air intake after intercooling is set as the infrared image characteristic of the temperature in the second temperature range. Specifically, because the inter-cooling front air inlet temperature and the inter-cooling rear air inlet temperature of different engine models or different working conditions have differences, the inter-cooling front air inlet air leakage infrared characteristic and the inter-cooling rear air inlet air leakage infrared characteristic need to determine the infrared characteristic which is suitable for the temperature according to specific conditions. For example, the exhaust temperature of the engine is higher than 200 ℃, the intake temperature before intercooling is between 80 ℃ and 160 ℃, the intake temperature after intercooling is between 40 ℃ and 60 ℃, then the infrared imaging image of the gas with the infrared characteristic of the air leakage of the intercooling advance air is 80 ℃ to 160 ℃, and the infrared imaging image of the gas with the infrared characteristic of the air leakage of the intercooling advance air is 40 ℃ to 60 ℃. At this time, the first temperature range is 80 to 160℃and the second temperature range is 40 to 60 ℃. The temperature of the exhaust pipe air leakage, the air leakage of the air inlet before intercooling and the air leakage of the air inlet after intercooling is higher than the ambient temperature. And under the high-load working condition of the engine, the temperature of the engine is between 80 ℃ and 105 ℃, so that the temperature of the exhaust pipe air leakage, the temperature of the inter-cooling front air leakage and the temperature of the inter-cooling rear air leakage are greatly different from the temperature of the engine, and the air leakage infrared characteristics of the exhaust pipe air leakage, the air leakage of the inter-cooling front air leakage and the air leakage of the inter-cooling rear air leakage can be clearly distinguished from the environment infrared characteristics and the engine infrared characteristics. In this embodiment, the second preset value is the rated power of the engine.
Specifically, the first view angle is a view angle opposite to the exhaust side of the engine, the third infrared image is an engine infrared image of the exhaust side, and the third infrared image is used for acquiring the air leakage infrared characteristic of the intercooling forward air inlet pipeline. The second view angle is a view angle opposite to the flywheel side of the engine, the fourth infrared image is an engine infrared image of the flywheel side of the engine, and the fourth infrared image is used for acquiring the air leakage characteristics of the intercooling pipeline and the exhaust side air inlet pipeline. The third view angle is a view angle opposite to the air inlet side of the engine, and the fifth infrared image is an engine infrared image of the air inlet side and is used for acquiring the air leakage infrared characteristics of the air inlet pipeline after intercooling. Therefore, when the third infrared image has the infrared feature of the air leakage of the air before the middle cooling, or the fourth infrared image has the infrared feature of the air leakage of the air before the middle cooling, or the infrared feature of the air leakage of the air after the middle cooling, or the fifth infrared image has the infrared feature of the air leakage of the air after the middle cooling, the air leakage of the engine can be determined. In this embodiment, according to the difference of the exhaust pipe leakage temperature, the charge air leakage temperature before intercooling and the charge air leakage temperature after intercooling, different color code imaging temperature ranges are respectively set, specifically, the color code imaging temperature ranges of the first infrared image and the third infrared image acquired at the first view angle are set to 80-300 ℃, the color code imaging temperature ranges of the second infrared image and the fourth infrared image acquired at the second view angle are set to 40-100 ℃, the color code imaging temperature ranges of the fifth infrared image acquired at the third view angle are set to 20-60 ℃, the exhaust side, the charge side and the flywheel side are distinguished by different color code settings, and the detection time is determined according to the engine operation condition characteristics, so that the influence of the engine heat radiation is avoided as much as possible, and the interference is eliminated.
In some embodiments of the present invention, an engine air leakage detection method includes: and sending out alarm information according to the determined air leakage of the engine, so that a detector can acquire the air leakage information.
In some embodiments of the present invention, as shown in fig. 3, after determining the engine air leakage, the engine air leakage detection method further includes the steps of:
step S301: determining the leakage point position of the engine leakage;
Step S302: obtaining appearance characteristics of each part of the engine;
step S303: and determining the leaked parts according to the positions of the leakage points and the appearance characteristics of the parts of the engine.
In this embodiment, in step S301, determining the position of the leakage point of the engine air leakage specifically includes determining the position of the leakage point according to the first infrared image and the second infrared image, and when the exhaust pipe air leakage infrared feature appears in the first infrared image or the second infrared image, obtaining the position of the leakage point of the engine air leakage according to the position of the exhaust pipe air leakage infrared feature in the first infrared image or the second infrared image. Or determining the position of the leakage point according to the third infrared image, the fourth infrared image and the fifth infrared image. Further, the gas infrared characteristic gas diffuses and the temperature is reduced, and the temperature at the common leakage point is the highest, so that the highest temperature point in the exhaust pipe leakage infrared characteristic is determined as the leakage point position. In general, the leak characteristics are relatively irregular and can be detected by visual algorithms. In step S302, appearance characteristics of each part of the engine, for example, appearance characteristics of key parts of an exhaust system of the engine, such as a supercharger, an intake pipe, an exhaust pipe, an intercooler pipe, etc., are obtained, and the leakage part can be determined by combining the information of the leakage point position with the appearance characteristics of each part of the engine. Specifically, the positions of the missing points are generally coordinate data information obtained according to the infrared image, and the appearance characteristics of each part of the engine are specifically the appearance images under the same visual angle as the infrared image characteristics of the determined positions of the missing points, wherein the appearance characteristics of each part comprise the shape of each part, the area where each part is located and the coordinate information of the outlines of the parts. Substituting the coordinate data of the positions of the leakage points into the appearance characteristic images of all parts of the engine to determine the parts with the positions of the leakage points. In detail, the appearance characteristics of each part of the engine comprise appearance characteristic images of each part under three visual angles of a first visual angle, a second visual angle and a third visual angle, the appearance characteristic images of each part obtained under the first visual angle correspond to a first infrared image and a third infrared image, the appearance characteristic images of each part obtained under the second visual angle correspond to a second infrared image and a fourth infrared image, and the appearance characteristic images of each part obtained under the third visual angle correspond to a fifth infrared image. When the information of the leakage point position is determined through the first infrared image or the third infrared image, the leakage parts are determined by combining the appearance characteristic images of the parts obtained under the first visual angle. When the information of the leakage point position is determined through the second infrared image or the fourth infrared image, the leaking parts are determined by combining the appearance characteristic images of the parts obtained under the second visual angle. When the information of the leakage point position is determined by the fifth infrared image, the leaking part is determined by combining the appearance characteristic images of the parts obtained under the third visual angle. Specifically, the information such as the appearance, the position and the like of each part is processed and analyzed through pattern recognition, so that the recognition of each part is realized, and then the leakage point position data and the appearance characteristic data of each part are extracted through machine learning, so that the part with air leakage is determined according to a preset algorithm.
According to an exemplary embodiment of the present invention, there is provided an engine air leakage detection method, as shown in fig. 7, including the steps of:
step S401: the engine is operated according to the technological requirements;
step S402: judging whether the running power of the engine reaches a first preset value, if so, executing a step S403, and if not, executing a step S401;
step S403: acquiring a first infrared image of exhaust gas of an engine at a first viewing angle and a second infrared image of the engine at a second viewing angle;
Step S404: judging whether the first infrared image or the second infrared image has the air leakage characteristic, if so, executing a step S406, otherwise, executing a step S405;
step S405: the engine continues to run;
step S406: determining a position of a leakage point according to the temperature characteristics of the first infrared image or the second infrared image;
Step S407: judging whether the running power of the engine reaches a second preset value, if so, executing a step S408, and if not, executing a step S405;
step S408: acquiring a third infrared image of the engine at the first view angle, a fourth infrared image of the engine at the second view angle and a fifth infrared image of the engine at the third view angle;
step S409: judging whether the third infrared image or the fourth infrared image or the fifth infrared image has the air leakage characteristic, if so, executing the step S410, otherwise, ending;
Step S410: determining the position of the leakage point according to the temperature characteristics of the third infrared image or the fourth infrared image or the fifth infrared image;
Step S411: obtaining appearance characteristics of each part of the engine;
Step S412: and determining the leaked parts according to the positions of the leakage points and the appearance characteristics of the parts of the engine.
In this embodiment, the engine is started first, and the engine is operated according to a process requirement, when the engine operating power reaches a first preset value, a first infrared image of exhaust gas of the engine at a first viewing angle and a second infrared image of the engine at a second viewing angle are obtained, if the first infrared image or the second infrared image has a gas leakage feature, gas leakage of the engine is described, then a position of a leakage point is determined according to a temperature feature of the first infrared image or the second infrared image, appearance features of each part of the engine are obtained, the part of the gas leakage is determined according to the position of the leakage point and the appearance feature of each part of the engine, and after the part of the gas leakage is determined, gas leakage fault warning is performed. If the first infrared image or the second infrared image has no air leakage characteristic, the engine continues to run, when the running power of the engine reaches a second preset value, a third infrared image of the engine at the first visual angle, a fourth infrared image of the engine at the second visual angle and a fifth infrared image of the engine at the third visual angle are obtained, whether the third infrared image or the fourth infrared image or the fifth infrared image has the air leakage characteristic is judged, if the third infrared image or the fourth infrared image or the fifth infrared image has the air leakage characteristic, the air leakage of the engine is determined, the position of a leakage point is determined according to the temperature characteristic of the third infrared image or the fourth infrared image or the fifth infrared image, the appearance characteristic of each part of the engine is obtained, the air leakage part is determined according to the position of the leakage point and the appearance characteristic of each part of the engine, and then fault alarming is carried out.
According to an embodiment of the present invention, there is provided an engine air leakage detection device, as shown in fig. 4 to 6, including: the first acquisition unit 11, the first infrared imaging unit 21, the second infrared imaging unit 22, the second acquisition unit 12, the control unit 13, and the alarm device 14. The first acquisition unit 11 is for acquiring the operating power of the engine 3. The first infrared imaging unit 21 is an infrared imager, and when the power of the engine 3 reaches a first preset value, the first infrared imaging unit 21 is configured to acquire a first infrared image of the exhaust side of the engine 3 at a first viewing angle. The second infrared imaging unit 22 is an infrared imager, and when the power of the engine 3 reaches a first preset value, the second infrared imaging unit 22 is configured to acquire a second infrared image of the flywheel side of the engine 3 at a second viewing angle. The second acquisition unit 12 is used for acquiring the exhaust pipe leakage infrared characteristic. The control unit 13 is configured to determine that the engine 3 is leaking based on either one of the first infrared image and the second infrared image having an exhaust pipe leak infrared characteristic. The control unit 13 issues an alarm message in response to determining that the engine leaks air, controlling the alarm device 14. The alarm device 14 may be a speaker, and the alarm is achieved by playing voice or presetting sound waves, or the alarm device 14 is a display screen, and the alarm is achieved by displaying image alarm information.
In this embodiment, the temperature of the engine 3 is lower under the low-load working condition of the engine 3, so that the interference of the heat radiation of the engine 3 on the infrared characteristics of the air leakage identified in the thermal imaging diagram can be effectively reduced, the air leakage detection accuracy of the engine 3 is improved, and the air leakage detection is avoided.
In some embodiments of the present invention, the first infrared imaging unit 21 is further configured to obtain a third infrared image of the exhaust side of the engine 3 at a first viewing angle according to the power of the engine 3 reaching a second preset value, where the first viewing angle is a viewing angle opposite to the exhaust side of the engine 3, the third infrared image is an infrared image of the engine 3 at the exhaust side, and the third infrared image is used to obtain an infrared feature of air leakage of the intercooler air intake pipeline. The second infrared imaging unit 22 is further configured to obtain a fourth infrared image of the flywheel side of the engine 3 at a second viewing angle according to the power of the engine 3 reaching a second preset value, where the second viewing angle is a viewing angle opposite to the flywheel side of the engine 3, the fourth infrared image is an infrared image of the engine 3 on the flywheel side of the engine 3, and the fourth infrared image is used to obtain the air leakage characteristics of the intercooler pipeline and the exhaust side air intake pipeline. The second acquiring unit 12 is further configured to acquire an intercooling forward air-intake air-leakage infrared characteristic and an intercooling post air-intake air-leakage infrared characteristic; the engine air leakage detection device further includes: the third infrared imaging unit 23 is configured to obtain a fifth infrared image of the air intake side of the engine 3 at a third viewing angle according to the power of the engine 3 reaching a second preset value, where the third viewing angle is a viewing angle opposite to the air intake side of the engine 3, and the fifth infrared image is an infrared image of the engine 3 at the air intake side, and is configured to obtain an air leakage infrared characteristic of the air intake pipeline after intercooling. The third infrared image has an inter-cooling front intake air leakage infrared feature, or the fourth infrared image has an inter-cooling front intake air leakage infrared feature or an inter-cooling rear intake air leakage infrared feature, or the fifth infrared image has an inter-cooling rear intake air leakage infrared feature, and the control unit 13 may determine that the engine 3 is leaking. The technical scheme provided by the embodiment is used for detecting whether the air inlet and air leakage faults exist in the engine 3 under the high-load working condition of the engine 3.
In some embodiments of the present invention, the range of temperature of the color patch imaging of the first infrared imaging unit matches the preset range; the temperature range of color code imaging of the second infrared imaging unit is matched with the first temperature range; the temperature range of the color code imaging of the third infrared imaging unit is matched with the second temperature range so as to be set into different temperature differences and color code imaging according to the difference of the temperature range and the effect detected by the infrared imaging unit, thereby facilitating image identification. For example, when the exhaust temperature of the engine 3 is greater than 200 ℃, the pre-charge air temperature is between 80 ℃ and 160 ℃, and the post-charge air temperature is between 40 ℃ and 60 ℃, the exhaust pipe leakage infrared image is a gas infrared imaging image with the pre-charge air leakage infrared characteristic of 80 ℃ to 160 ℃ and the post-charge air leakage infrared characteristic of 40 ℃ to 60 ℃. Therefore, the temperature range of the color code imaging of the first infrared imaging unit 21 is set to 80-300 ℃, so that the first infrared image and the third infrared image acquired by the first imaging unit can respectively cover the exhaust pipe air leakage infrared characteristic and the intercooler air leakage infrared characteristic, and the exhaust pipe air leakage infrared characteristic can be clearly shown in the first infrared image or the intercooler air leakage infrared characteristic can be clearly shown in the third infrared image characteristic. The temperature range of the color code imaging of the second infrared imaging unit 22 is set to 40-100 ℃, so that the second infrared image and the fourth infrared image acquired by the second imaging unit can respectively cover the infrared characteristics of air intake and air leakage after intercooling. The temperature range of the color code imaging of the third infrared imaging unit 23 is set to be 20-60 ℃, so that the fifth infrared image acquired by the third imaging unit can cover the infrared characteristics of the air intake and air leakage after the intercooling, and the infrared characteristics of the air intake and air leakage after the intercooling can be clearly shown in the characteristics of the fifth infrared image.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (7)
1. An engine air leakage detection method, characterized in that the detection method comprises:
Acquiring the running power of an engine;
acquiring a first infrared image of exhaust gas of the engine at a first visual angle and a second infrared image of the engine at a second visual angle according to the power of the engine reaching a first preset value;
acquiring the infrared characteristics of the leakage of the exhaust pipe;
Determining that the engine leaks according to either one of the first infrared image and the second infrared image having the exhaust pipe leak infrared characteristic;
wherein the orientation of the first viewing angle is different from the orientation of the second viewing angle;
the engine air leakage detection method further includes:
Acquiring a third infrared image of the engine at the first visual angle, a fourth infrared image of the engine at the second visual angle and a fifth infrared image of the engine at the third visual angle according to the fact that the running power of the engine reaches a second preset value;
Acquiring an intercooling forward air inlet air leakage infrared characteristic and an intercooling rear air inlet air leakage infrared characteristic;
Determining that the engine leaks according to whether the third infrared image has the intercooling forward air-intake air-leakage infrared feature, or whether the fourth infrared image has the intercooling forward air-leakage infrared feature or the intercooling post-intake air-leakage infrared feature, or whether the fifth infrared image has the intercooling post-intake air-leakage infrared feature;
Wherein the second preset value is greater than the first preset value, and any two of the first viewing angle, the second viewing angle and the third viewing angle are oriented differently;
after determining the engine air leakage, the engine air leakage detection method further comprises the following steps:
Determining the leakage point position of the engine leakage;
obtaining appearance characteristics of each part of the engine;
Determining the leakage parts according to the leakage point positions and the appearance characteristics of the parts of the engine;
The appearance characteristics of all parts of the engine are specifically appearance images under the same visual angle as the infrared image characteristics of the determined leakage point positions, and the appearance characteristics of all parts comprise the shape of all parts, the area where the parts are positioned and the coordinate information of the outlines of the parts;
The power of the engine reaches a first preset value, namely the running power of the engine in an idle state; the second preset value is the rated power of the engine.
2. The engine air leakage detection method according to claim 1, wherein,
The first viewing angle is a viewing angle facing an exhaust side of the engine;
the second viewing angle is a viewing angle of a flywheel side facing the engine;
the third viewing angle is a viewing angle facing an intake side of the engine.
3. The engine air leakage detection method according to claim 1, wherein,
The exhaust pipe leakage infrared characteristic is set as an infrared image characteristic with the temperature exceeding a preset temperature;
the infrared characteristic of air leakage of the air inlet before intercooling is set as an infrared image characteristic of which the temperature is in a first temperature range;
the infrared characteristic of air leakage of the air intake after intercooling is set as the infrared image characteristic of the temperature in the second temperature range.
4. The engine air leakage detection method according to claim 1, characterized in that the engine air leakage detection method further comprises:
And sending alarm information according to the determined engine air leakage.
5. The engine leak detection method of claim 1, wherein the determining a leak location of the engine leak comprises:
determining the position of the leakage point according to the first infrared image and the second infrared image;
Or alternatively, the first and second heat exchangers may be,
And determining the position of the leakage point according to the third infrared image, the fourth infrared image and the fifth infrared image.
6. An engine air leakage detection device for implementing the engine air leakage detection method according to any one of claims 1 to 5, characterized in that the engine air leakage detection device includes:
the first acquisition unit is used for acquiring the running power of the engine;
the first infrared imaging unit is used for acquiring a first infrared image of the exhaust side of the engine at a first visual angle according to the fact that the power of the engine reaches a first preset value;
The second infrared imaging unit is used for acquiring a second infrared image of the flywheel side of the engine at a second visual angle according to the fact that the power of the engine reaches a first preset value;
the second acquisition unit is used for acquiring the leakage infrared characteristics of the exhaust pipe;
a control unit electrically connected with the first acquisition unit, the second acquisition unit, the first infrared imaging unit and the second infrared imaging unit respectively,
The control unit is used for determining the engine leakage according to the fact that any one of the first infrared image and the second infrared image has the exhaust pipe leakage infrared characteristic;
The first infrared imaging unit is further used for obtaining a third infrared image of the exhaust side of the engine at a first visual angle according to the fact that the running power of the engine reaches a second preset value;
the second infrared imaging unit is further used for obtaining a fourth infrared image of the flywheel side of the engine at a second visual angle according to the fact that the power of the engine reaches a second preset value;
The second acquisition unit is also used for acquiring the air leakage infrared characteristics of the intercooling forward air inlet and the air leakage infrared characteristics of the intercooling after air inlet;
The engine air leakage detection device further includes:
the third infrared imaging unit is electrically connected with the control unit and is used for acquiring a fifth infrared image of the air inlet side of the engine at a third visual angle according to the fact that the power of the engine reaches a second preset value;
the alarm device is electrically connected with the control unit;
The control unit is used for determining the engine air leakage according to the fact that the third infrared image has the intercooling forward air inlet air leakage infrared characteristic, or the fourth infrared image has the intercooling forward air leakage infrared characteristic or the intercooling rear air inlet air leakage infrared characteristic, or the fifth infrared image has the intercooling rear air inlet air leakage infrared characteristic; the control unit is also used for controlling the alarm device to send alarm information according to the determined engine air leakage.
7. The engine air leakage detection device according to claim 6, wherein,
The temperature range of color code imaging of the first infrared imaging unit is matched with a preset range;
The temperature range of color code imaging of the second infrared imaging unit is matched with the first temperature range;
the temperature range of the color code imaging of the third infrared imaging unit is matched with the second temperature range.
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