CN114577399A - Engine air leakage detection method and detection device - Google Patents
Engine air leakage detection method and detection device Download PDFInfo
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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 of the engine at a first visual angle and a second infrared image of the engine at a second visual angle according to the condition that the power of the engine reaches a first preset value; acquiring the air leakage infrared characteristics of the exhaust pipe; determining that the engine is air-leaking according to the fact that either one of the first infrared image and the second infrared image has the exhaust pipe air-leaking infrared characteristic; the orientation of the first visual angle and the orientation of the second visual angle form a preset included angle. According to the engine air leakage detection method, under the specific working condition of the engine, the infrared characteristics of air leakage 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 of the coincidence of the infrared characteristics of air leakage and the infrared characteristics of the engine on the identification of air leakage of the engine 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 background information related to the present disclosure only and is not necessarily prior art.
The air leakage fault of the engine is one of three leakage faults of the engine, the air leakage fault can lead the technical state of the engine to be poor, if the fault performance of insufficient power occurs, high-temperature gas can also influence wiring harnesses and 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, when the engine is used for testing on a bench, the air inlet pressure is checked through listening, the air leakage is detected by modes such as soapy water and the like, the detection is difficult to perceive, the judgment is missed, and a plurality of problems such as fault points are difficult to find.
In the related technology, the organic compound is utilized to absorb heat in gasification or be ignited by static electricity to cause the difference change with the environmental temperature, the preliminary identification is carried out by comparing the temperature difference between the front and the back, then the filter disc is utilized to identify the specific infrared wavelength of the olefin gas to judge whether the olefin gas leaks, and an alarm logic is set. However, the temperature of the engine is high during operation, the temperature difference of different parts is inconsistent, the temperature change under different working conditions is large, the temperature difference range is large compared with the environment, and the method for identifying the abnormal temperature change in the scheme cannot judge air leakage.
Disclosure of Invention
The invention aims to at least solve the problem that the air leakage detection of an engine is interfered due to high temperature when the engine runs. The purpose is realized by the following technical scheme:
the technical scheme of the first aspect of the invention provides an engine air leakage detection method, which is used for obtaining the running power of an engine; acquiring a first infrared image of exhaust of the engine at a first visual angle and a second infrared image of the engine at a second visual angle according to the condition that the power of the engine reaches a first preset value; acquiring the air leakage infrared characteristics of the exhaust pipe; determining that the engine air leakage is present according to the exhaust pipe air leakage infrared characteristic of either of the first infrared image and the second infrared image; wherein the orientation of the first perspective is different from the orientation of the second perspective.
According to the engine air leakage detection method provided by the invention, the air leakage of the engine can be determined by obtaining the thermal imaging graph of the engine when the thermal imaging graph has the air leakage infrared characteristic. Based on the fact that the engine operating power is in a first preset value, the engine is enabled to operate under the working condition of low load, the supercharging pressure is small at the moment, the exhaust temperature of an exhaust pipeline of the engine is lower than that under the working condition of high load, but is higher than the ambient temperature, and the temperature of the engine is lower, so that the exhaust temperature of the engine is obviously higher than the ambient temperature and the temperature of the engine. The infrared characteristics of the air leakage of the exhaust pipe can be clearly distinguished from the infrared characteristics of the environment and the infrared characteristics of the engine. Under the specific operating power of the engine, the infrared characteristics of the air leakage 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 accuracy of air leakage detection of the engine is improved. In addition, a first infrared image and a second infrared image of the engine are acquired at a first angle and a second angle which are different from each other, and when any one of the first infrared image and the second infrared image has exhaust pipe air leakage infrared characteristics, air leakage of the engine is determined so as to eliminate interference on air leakage identification caused by superposition of the air leakage infrared characteristics and the engine infrared characteristics.
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 infrared characteristics of air leakage of front air after intercooling and air leakage of rear air after intercooling; determining that the engine is air leaking according to the fact that the third infrared image has the intercooling front air intake and air leakage infrared characteristic, or the fourth infrared image has the intercooling front air intake and air leakage infrared characteristic or the intercooling rear air intake and air leakage infrared characteristic, or the fifth infrared image has the intercooling rear air intake and air leakage infrared characteristic; and the second preset value is larger than the first preset value, and the orientation of any two of the first visual angle, the second visual angle and the third visual angle is different.
In some embodiments of the invention, the first viewing angle is a viewing angle facing an exhaust side of the engine; the second view is a view facing a flywheel side of the engine; the third view angle is a view angle facing the air intake side of the engine.
In some embodiments of the invention, the exhaust pipe air leakage infrared characteristic is set as an infrared image characteristic of which the temperature exceeds a preset temperature; the infrared characteristic of the intercooling front air intake leakage is set as an infrared image characteristic with the temperature within a first temperature range; and the infrared characteristic of the intercooled intake air leakage is set as an infrared image characteristic of which the temperature is 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 air leakage of the engine.
In some embodiments of the present invention, after determining the engine air leakage, the engine air leakage detecting method further comprises: determining a leak point position of the engine air leakage; acquiring appearance characteristics of each part of the engine; and determining the air leakage parts according to the positions of the leakage points and the appearance characteristics of all parts of the engine.
In some embodiments of the invention, the determining the location of the leak point of the engine blow-by comprises: determining the position of the missing point according to the first infrared image and the second infrared image; or determining the position of the missing point according to the third infrared image, the fourth infrared image and the fifth infrared image.
In a second aspect of the present invention, an engine air leakage detection device is provided, where the engine air leakage detection device is used to implement an engine air leakage detection method, and 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 condition 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 air leakage infrared characteristics of the exhaust pipe; the control unit is respectively and electrically connected with the first acquisition unit, the second acquisition unit, the first infrared imaging unit and the second infrared imaging unit, and is used for determining the air leakage of the engine according to the infrared characteristic that any one of the first infrared image and the second infrared image has the air leakage of the exhaust pipe; wherein the orientation of the first perspective is different from the orientation of the second perspective.
According to the engine air leakage detection device provided by the invention, the air leakage of the engine can be determined when the thermal imaging graph has the air leakage infrared characteristic by acquiring the thermal imaging graph of the engine. Based on the fact that the engine operating power is at the first preset value, the engine operates under the low-load working condition, the supercharging pressure is small at the moment, the exhaust temperature of an exhaust pipeline of the engine is lower than that of the engine under the high-load working condition, but the relative ambient temperature is higher, and the temperature of the engine is lower, so that the interference of the thermal radiation of the engine on the recognition of the air leakage infrared characteristics in a thermal imaging graph can be effectively reduced, the missing judgment is avoided, and the air leakage detection accuracy of the engine is improved. In addition, a first infrared image and a second infrared image of the engine are acquired at a first angle and a second angle which are different, when any one of the first infrared image and the second infrared image has exhaust pipe air leakage infrared characteristics, air leakage of the engine is determined, and interference caused by superposition of the air leakage infrared characteristics and the engine infrared characteristics on infrared imaging identification is eliminated.
In some embodiments of the present invention, the first infrared imaging unit is further configured to acquire a third infrared image of the exhaust side of the engine at a first view angle according to the operating power of the engine reaching a second preset value; the second infrared imaging unit is further used for acquiring a fourth infrared image of the engine at a second view angle on the flywheel side 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 infrared characteristics of the air leakage before intercooling and the infrared characteristics of the air leakage after intercooling;
the engine air leakage detection device further includes: the third infrared imaging unit is electrically connected with the control unit and 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 air according to the fact that the third infrared image has the intercooling front intake air leakage infrared characteristic, or the fourth infrared image has the intercooling front intake air leakage infrared characteristic or the intercooling rear intake air leakage infrared characteristic, or the fifth infrared image has the intercooling rear intake air leakage infrared characteristic; and the control unit is also used for controlling the alarm device to send alarm information according to the determined air leakage of the engine.
In some embodiments of the invention, the temperature amount range of the color patch imaging of the first infrared imaging unit matches a preset range; the temperature quantity range of color code imaging of the second infrared imaging unit is matched with the first temperature range; the temperature quantity range of color scale 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 parts are designated by like reference numerals throughout the drawings. In the drawings:
FIG. 1 is a flow chart illustrating an engine leak detection method according to an exemplary embodiment;
FIG. 2 is a flow chart illustrating an engine leak detection method according to an exemplary embodiment;
FIG. 3 is a flow chart illustrating an engine leak detection method according to an exemplary embodiment;
FIG. 4 is a schematic diagram illustrating an engine air leak detection device according to an exemplary embodiment;
FIG. 5 is a schematic diagram of an engine and an engine leak detection device according to an exemplary embodiment;
FIG. 6 is a schematic diagram of an engine and an engine leak detection device according to an exemplary embodiment;
FIG. 7 is a flow chart illustrating an engine leak detection method according to an exemplary embodiment.
The reference numbers are as follows:
11-a first acquisition unit, 12-a second acquisition unit, 13-a control unit, 14-an alarm device, 21-a first infrared imaging unit, 22-a second infrared imaging unit, 23-a third infrared imaging unit and 3-an 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" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "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 discussed or illustrated, unless specifically identified as an order of performance. It should also be understood 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 convenience 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. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
According to an embodiment of the present invention, there is provided an engine air leakage detecting 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 of the engine at a first visual angle and a second infrared image of the engine at a second visual angle according to the condition that the power of the engine reaches a first preset value;
step S103: acquiring the infrared characteristics of the air leakage of the exhaust pipe;
step S104: engine air leakage is determined based on whether either of the first infrared image and the second infrared image has an exhaust pipe air leakage infrared characteristic.
In this embodiment, by obtaining a thermal image of the engine, engine blow-by can be determined when the thermal image has blow-by infrared characteristics. Specifically, the temperature of the engine and the engine exhaust temperature state are determined by obtaining the running 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 high relative to the ambient temperature, while the temperature of the engine is low.
The exhaust pipe air leakage infrared characteristic is set to be an infrared image characteristic with the temperature exceeding a preset temperature, and the exhaust temperature under different engine models or different working condition states is different, so that the specific value of the preset temperature needs to be determined according to specific conditions to obtain the accurate exhaust pipe air leakage infrared characteristic. For example, when the normal operating temperature of the engine is 80 ℃ to 105 ℃, and the exhaust temperature of the exhaust pipeline of the engine is more than 200 ℃ when the engine runs at low power, the infrared characteristic of the exhaust pipeline leakage is determined to be a gas infrared imaging image higher than 200 ℃, and the preset temperature is 200 ℃. In other embodiments, the preset temperature may be set to 240 ℃, 260 ℃, 300 ℃ or the like. The ambient temperature may range from-10 c to 35 c, and the engine may range from ambient temperature (e.g., 10 c to 90 c) when the engine is operating at low power, because the engine is near ambient temperature before starting. When the exhaust pipe of the engine leaks, the infrared characteristic of the leakage of the exhaust pipe is a gas infrared imaging image at the temperature of more than 200 ℃, and the exhaust temperature of the engine is obviously higher than the ambient temperature and the temperature of the engine. The infrared characteristics of the air leakage of the exhaust pipe can be clearly distinguished from the infrared characteristics of the environment and the infrared characteristics of the engine, so that the infrared characteristics of the air leakage of the exhaust pipe can be effectively identified by acquiring the first infrared image and the second infrared image, and the accuracy of the air leakage detection of the engine is improved. Specifically, the first visual angle is a visual angle facing an 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 exhaust pipe air leakage infrared characteristics. 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 on the flywheel side of the engine, and the second infrared image is used for eliminating interference on infrared imaging identification caused by superposition of the air leakage infrared characteristic and the engine infrared characteristic. The method comprises the steps of obtaining a first infrared image and a second infrared image of an engine at a first angle and a second angle which are different from each other, and determining that the engine is air-leaking when any one of the first infrared image and the second infrared image has the infrared characteristic of air-leaking of an exhaust pipe. It should be noted that, under a low-load working condition, the temperature of the engine is low, so that the interference of the thermal radiation of the engine on the recognition of the air leakage infrared characteristics in the thermal imaging graph can be effectively reduced, the missing judgment is avoided, and the air leakage detection accuracy of the engine is improved. In this embodiment, when the power of the engine reaches the first preset value, the power is the running power of the engine in the idle state.
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 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 power of the engine reaches a second preset value;
step S203: acquiring infrared characteristics of air leakage of front air after intercooling and air leakage of rear air after intercooling;
step S204: and determining the air leakage of the engine according to the fact that the third infrared image has the infrared characteristic of the front air inlet and air leakage before intercooling, or the fourth infrared image has the infrared characteristic of the front air inlet and air leakage before intercooling or the infrared characteristic of the rear air inlet and air leakage after intercooling, or the fifth infrared image has the infrared characteristic of the rear air inlet and air leakage after intercooling.
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 a 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 fault is different in performance, the supercharging pressure is low under low load, and even if a leakage point exists in the air inlet pipeline, the air leakage performance is less. Under the high-load working condition of the engine, the supercharging pressure is higher, the air inlet temperature is relatively higher after supercharging, and the air inlet and leakage have obvious characteristics at the moment. The infrared characteristic of the intercooling front air inlet air leakage is set as an infrared image characteristic of which the temperature is in a first temperature range; and the infrared characteristic of the air intake and leakage after intercooling is set as the infrared image characteristic of the temperature in the second temperature range. Specifically, since the intercooling front intake air temperature and the intercooling rear intake air temperature have differences in different engine models or different working condition states, the infrared characteristic of the intercooling front intake air leakage and the infrared characteristic of the intercooling rear intake air leakage need to be determined according to specific conditions. For example, when the exhaust temperature of the engine is more than 200 ℃, the temperature of the cold air before entering is between 80 ℃ and 160 ℃, and the temperature of the cold air after entering is between 40 ℃ and 60 ℃, the infrared characteristic of the cold air before entering and leaking is a gas infrared imaging image at 80 ℃ to 160 ℃, and the infrared characteristic of the cold air after entering and leaking is a gas infrared imaging image at 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 air leakage of the exhaust pipe, the air leakage of the intercooling front air inlet and the air leakage of the intercooling rear air inlet 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 intercooling front air leakage and the intercooling 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 intercooling front air leakage and the intercooling 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 facing an 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 air leakage infrared characteristics of a front air pipeline before intercooling. The second visual angle is a visual 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 air leakage characteristics of the intercooling pipeline and the exhaust side air inlet pipeline. The third visual angle is a visual angle which is 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 air leakage infrared characteristics of the air inlet pipeline after intercooling. Therefore, when the third infrared image has the infrared characteristic of the intercooling front intake air leakage, or the fourth infrared image has the infrared characteristic of the intercooling front intake air leakage or the infrared characteristic of the intercooling rear intake air leakage, or the fifth infrared image has the infrared characteristic of the intercooling rear intake air leakage, the engine air leakage can be determined. In the embodiment, different color scale imaging temperature ranges are respectively set according to different air leakage temperatures of the exhaust pipe, the front air leakage temperature during intercooling and the rear air leakage temperature during intercooling, specifically, the color scale imaging temperature ranges of the first infrared image and the third infrared image acquired at the first visual angle are set to be 80-300 ℃, the color scale imaging temperature ranges of the second infrared image and the fourth infrared image acquired at the second visual angle are set to be 40-100 ℃, and the color scale imaging temperature range of the fifth infrared image acquired at the third visual angle is set to be 20-60 ℃, so that the exhaust side, the air inlet side and the flywheel side are distinguished through different color scale settings, the detection time is determined according to the operating condition characteristics of the engine, the influence of the heat radiation of the engine is avoided as much as possible, and the interference is eliminated.
In some embodiments of the present invention, an engine leak detection method includes: and sending alarm information according to the determined air leakage of the engine, so that the detector can acquire 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 detecting method further comprises the steps of:
step S301: determining the position of a leakage point of the air leakage of the engine;
step S302: the method comprises the steps of obtaining appearance characteristics of all parts of the engine;
step S303: and determining the leaked parts according to the positions of the leakage points and the appearance characteristics of all parts of the engine.
In this embodiment, in step S301, determining the position of the engine leakage point specifically includes determining the position of the leakage point according to the first infrared image and the second infrared image, and when the first infrared image or the second infrared image has the exhaust pipe leakage infrared feature, obtaining the position of the engine leakage point according to the position of the exhaust pipe leakage infrared feature in the first infrared image or the second infrared image. Or determining the position of the missing point according to the third infrared image, the fourth infrared image and the fifth infrared image. Further, the infrared characteristic gas of the gas diffuses, the temperature is reduced, and the temperature at the common leakage point is the highest, so that the highest temperature in the infrared characteristic of the gas leakage of the exhaust pipe is determined as the position of the leakage point. Generally, the air leakage characteristics are irregular and can be detected by a visual algorithm. In step S302, appearance characteristics of each component of the engine, for example, appearance characteristics of key components of an exhaust system of the engine, such as a supercharger, an intake and exhaust pipe, an inter-cooling pipeline, etc., are obtained, and the leaked component can be determined by combining information of the position of the leakage point and the appearance characteristics of each component of the engine. Specifically, the missing point position is generally coordinate data information acquired according to the infrared image, the appearance characteristic of each part of the engine is specifically an appearance image at the same viewing angle as the infrared image characteristic of the determined missing point position, and the appearance characteristic of each part includes the shape, the located area and the coordinate information of the part outline. And substituting the coordinate data of the positions of the missing points into the appearance characteristic image of each part of the engine to determine the part at the positions of the missing points. In detail, the appearance characteristics of each component of the engine include appearance characteristic images of each component at three viewing angles, namely, a first viewing angle, a second viewing angle and a third viewing angle, the appearance characteristic image of each component obtained at the first viewing angle corresponds to the first infrared image and the third infrared image, the appearance characteristic image of each component obtained at the second viewing angle corresponds to the second infrared image and the fourth infrared image, and the appearance characteristic image of each component obtained at the third viewing angle corresponds to the fifth infrared image. And when the information of the position of the leakage point is determined through the first infrared image or the third infrared image, determining the leaked parts by combining the appearance characteristic images of the parts obtained under the first visual angle. And when the information of the positions of the leaking points is determined through the second infrared image or the fourth infrared image, determining the parts leaking the air by combining the appearance characteristic images of the parts obtained under the second visual angle. And when the information of the position of the leakage point is determined through the fifth infrared image, determining the leaked parts by combining the appearance characteristic images of the parts obtained under the third visual angle. Specifically, information such as the appearance and the position of each part is processed and analyzed through pattern recognition, so that each part is recognized, and then the position data of the leakage point and the appearance characteristic data of each part are extracted through machine learning to determine the leaked part according to a preset algorithm.
According to an exemplary embodiment of the present invention, there is provided an engine air leakage detecting method, as shown in fig. 7, including the steps of:
step S401: the engine runs 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, otherwise, executing a step S401;
step S403: 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;
step S404: judging whether the first infrared image or the second infrared image has air leakage characteristics, if so, executing a step S406, otherwise, executing a step S405;
step S405: the engine continues to run;
step S406: determining the 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 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;
step S409: judging whether the third infrared image or the fourth infrared image or the fifth infrared image has air leakage characteristics, if so, executing a step S410, otherwise, ending;
step S410: determining the position of a leakage point according to the temperature characteristics of the third infrared image, the fourth infrared image or the fifth infrared image;
step S411: the method comprises the steps of obtaining appearance characteristics of all parts of the engine;
step S412: and determining the leaked parts according to the positions of the leakage points and the appearance characteristics of all parts of the engine.
In the embodiment, an engine is started firstly, the engine is enabled to run according to process requirements, when the running power of the engine reaches a first preset value, 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 are obtained, if the first infrared image or the second infrared image has air leakage characteristics, air leakage of the engine is indicated, then the position of a leakage point is determined according to the temperature characteristics of the first infrared image or the second infrared image, the appearance characteristics of each part of the engine are obtained, the part with air leakage is determined according to the position of the leakage point and the appearance characteristics of each part of the engine, and after the part with air leakage is determined, air leakage fault alarm is carried out. If the first infrared image or the second infrared image has no air leakage characteristic, the engine continues to operate, when the operating power of the engine reaches a second preset value, 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, judging whether the third infrared image, the fourth infrared image or the fifth infrared image has an air leakage characteristic, if the third infrared image, the fourth infrared image or the fifth infrared image has the air leakage characteristic, determining that the engine is air leaked, determining the positions of the leakage points according to the temperature characteristics of the third infrared image, the fourth infrared image or the fifth infrared image, acquiring the appearance characteristics of each part of the engine, and determining the air leakage parts according to the positions of the leakage points and the appearance characteristics of all parts of the engine, and performing air leakage fault alarm after determining the air leakage parts.
According to an embodiment of the present invention, there is provided an engine air leakage detecting device, as shown in fig. 4 to 6, including: a first acquisition unit 11, a first infrared imaging unit 21, a second infrared imaging unit 22, a second acquisition unit 12, a control unit 13, and an alarm device 14. The first obtaining unit 11 is used for obtaining the running 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 angle of view. The second infrared imaging unit 22 is an infrared imager, and when the power of the engine 3 reaches the 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 angle of view. The second acquiring unit 12 is used for acquiring the exhaust pipe air leakage infrared characteristics. The control unit 13 is configured to determine that the engine 3 is air-leaking from either of the first infrared image and the second infrared image having an exhaust pipe air-leakage infrared characteristic. The control unit 13 controls the alarm device 14 to issue alarm information according to the determined engine air leakage. The alarm device 14 may be a speaker that realizes an alarm by playing a voice or presetting a sound wave, or the alarm device 14 may be a display screen that realizes an alarm by displaying image alarm information.
In this embodiment, engine 3 is under low load operating mode, and engine 3's temperature is lower, can effectively reduce 3 thermal radiation of engine and to discerning the interference of gas leakage infrared characteristic in the thermal imaging picture, avoids lou to judge, improves 3 gas leakage detection's of engine rate of accuracy.
In some embodiments of the present invention, the first infrared imaging unit 21 is further configured to obtain, according to that the power of the engine 3 reaches a second preset value, a third infrared image of the exhaust side of the engine 3 at a first view angle, where the first view angle is a view angle directly facing 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 characteristic of air leakage of the front air pipeline during inter-cooling. The second infrared imaging unit 22 is further configured to acquire a fourth infrared image of the flywheel side of the engine 3 at a second viewing angle according to the fact that the power of the engine 3 reaches a second preset value, where the second viewing angle is a viewing angle facing the flywheel side of the engine 3, the fourth infrared image is an infrared image of the engine 3 at the flywheel side of the engine 3, and the fourth infrared image is used to acquire air leakage characteristics of the intercooler pipeline and the exhaust-side air intake pipeline. The second obtaining unit 12 is further configured to obtain infrared characteristics of the intake air leakage before intercooling and infrared characteristics of the intake air leakage after intercooling; 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 fact that the power of the engine 3 reaches a second preset value, where the third viewing angle is a viewing angle directly facing 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 used for obtaining an air leakage infrared characteristic of the intercooling rear air intake pipeline. If the third infrared image has the infrared characteristic of the front intake air leakage during the inter-cooling, or the fourth infrared image has the infrared characteristic of the front intake air leakage during the inter-cooling, or the infrared characteristic of the rear intake air leakage during the inter-cooling, or the fifth infrared image has the infrared characteristic of the rear intake air leakage during the inter-cooling, the control unit 13 may determine that the engine 3 is leaking air. The technical scheme provided by the embodiment is used for detecting whether the engine 3 has an air inlet and air leakage fault under the high-load working condition of the engine 3.
In some embodiments of the present invention, the temperature amount range of color patch imaging of the first infrared imaging unit matches a preset range; the temperature quantity range of color code imaging of the second infrared imaging unit is matched with the first temperature range; the temperature quantity scope of the color mark formation of image of third infrared imaging unit matches with second temperature range in order to set different difference and color mark formation of image according to the difference of infrared imaging unit detection temperature scope and effect to make things convenient for image recognition. For example, when the exhaust temperature of the engine 3 is greater than 200 ℃, the cold inlet air temperature is between 80 ℃ and 160 ℃ before cold, and the cold inlet air temperature is between 40 ℃ and 60 ℃, the exhaust pipe air leakage infrared characteristic is a gas infrared imaging image with the cold inlet air leakage infrared characteristic of 80 ℃ to 160 ℃ before cold in a gas infrared imaging image with the temperature higher than 200 ℃, and the cold inlet air leakage infrared characteristic is a gas infrared imaging image with the temperature of 40 ℃ to 60 ℃. Therefore, the temperature range of color scale imaging of the first infrared imaging unit 21 is set to be 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 mid-cold front intake air leakage infrared characteristic, and the exhaust pipe air leakage infrared characteristic can be clearly displayed in the first infrared image or the mid-cold front intake air leakage infrared characteristic can be clearly displayed in the third infrared image characteristic. The temperature range of color scale imaging of the second infrared imaging unit 22 is set to be 40-100 ℃, so that the second infrared image and the fourth infrared image acquired by the second imaging unit can cover the infrared characteristics of air intake and air leakage after intercooling respectively. The temperature range of color scale 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 air intake and air leakage after intercooling, and the infrared characteristics of air intake and air leakage after intercooling can be clearly displayed in the fifth infrared image characteristics.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
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 of the engine at a first visual angle and a second infrared image of the engine at a second visual angle according to the condition that the power of the engine reaches a first preset value;
acquiring the air leakage infrared characteristics of the exhaust pipe;
determining that the engine air leakage is present according to the exhaust pipe air leakage infrared characteristic of either of the first infrared image and the second infrared image;
wherein the orientation of the first perspective and the orientation of the second perspective are different.
2. The engine air leakage detection method according to claim 1, further comprising:
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 a third visual angle according to the fact that the running power of the engine reaches a second preset value;
acquiring infrared characteristics of air leakage of front air after intercooling and air leakage of rear air after intercooling;
determining that the engine is air leaking according to the fact that the third infrared image has the intercooling front air intake and air leakage infrared characteristic, or the fourth infrared image has the intercooling front air intake and air leakage infrared characteristic or the intercooling rear air intake and air leakage infrared characteristic, or the fifth infrared image has the intercooling rear air intake and air leakage infrared characteristic;
and the second preset value is larger than the first preset value, and the orientation of any two of the first visual angle, the second visual angle and the third visual angle is different.
3. The engine air leakage detecting method according to claim 2,
the first view angle is a view angle facing an exhaust side of the engine;
the second view is a view facing a flywheel side of the engine;
the third view angle is a view angle facing the air intake side of the engine.
4. The engine air leakage detecting method according to claim 2,
the air leakage infrared characteristic of the exhaust pipe is set to be an infrared image characteristic that the temperature exceeds a preset temperature;
the infrared characteristic of the intercooling front air intake leakage is set as an infrared image characteristic of which the temperature is in a first temperature range;
and the infrared characteristic of the intercooled intake air leakage is set as an infrared image characteristic of which the temperature is in a second temperature range.
5. The engine air leakage detection method according to claim 1, further comprising:
and sending alarm information according to the determined air leakage of the engine.
6. The engine air leakage detection method according to claim 2, wherein after determining that the engine is air-leaked, the engine air leakage detection method further comprises:
determining a leak point position of the engine air leakage;
acquiring appearance characteristics of each part of the engine;
and determining the air leakage parts according to the positions of the leakage points and the appearance characteristics of all parts of the engine.
7. The engine air leakage detection method according to claim 6, wherein said determining a leak point location of the engine air leakage includes:
determining the position of the missing point according to the first infrared image and the second infrared image;
or the like, or, alternatively,
and determining the position of the missing point according to the third infrared image, the fourth infrared image and the fifth infrared image.
8. An engine air leakage detection device for implementing the engine air leakage detection method according to any one of claims 1 to 7, characterized by comprising:
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 condition 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 infrared characteristics of the air leakage of the exhaust pipe;
a control unit which is respectively and electrically connected with the first acquisition unit, the second acquisition unit, the first infrared imaging unit and the second infrared imaging unit,
the control unit is used for determining the engine air leakage according to the fact that either one of the first infrared image and the second infrared image has the infrared characteristics of the exhaust pipe air leakage.
9. The engine air leakage detecting device according to claim 8,
the first infrared imaging unit is further used for acquiring 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 acquiring a fourth infrared image of the engine at a second view angle on the flywheel side 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 infrared characteristics of the air leakage before intercooling and the infrared characteristics of the air leakage after intercooling;
the engine air leakage detection device further includes:
the third infrared imaging unit is electrically connected with the control unit and 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 air leakage of the engine according to the fact that the third infrared image has the infrared characteristic of the intercooling front air inlet air leakage, or the fourth infrared image has the infrared characteristic of the intercooling front air inlet air leakage or the infrared characteristic of the intercooling rear air inlet air leakage, or the fifth infrared image has the infrared characteristic of the intercooling rear air inlet air leakage; and the control unit is also used for controlling the alarm device to send alarm information according to the determined air leakage of the engine.
10. The engine air leakage detecting device according to claim 9,
the temperature range of color code imaging of the first infrared imaging unit is matched with a preset range;
the temperature quantity range of color code imaging of the second infrared imaging unit is matched with the first temperature range;
the temperature quantity range of color scale imaging of the third infrared imaging unit is matched with the second temperature range.
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