CN111104926A - Device and method for detecting bubble amount of cooling water vapor of engine - Google Patents
Device and method for detecting bubble amount of cooling water vapor of engine Download PDFInfo
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- CN111104926A CN111104926A CN201911405923.4A CN201911405923A CN111104926A CN 111104926 A CN111104926 A CN 111104926A CN 201911405923 A CN201911405923 A CN 201911405923A CN 111104926 A CN111104926 A CN 111104926A
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- bubble
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- engine
- identification software
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 239000000498 cooling water Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 239000010453 quartz Substances 0.000 claims abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000007872 degassing Methods 0.000 claims description 13
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 description 5
- 238000009835 boiling Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000110 cooling liquid Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/50—Context or environment of the image
- G06V20/52—Surveillance or monitoring of activities, e.g. for recognising suspicious objects
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- G06T5/70—
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/44—Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components
Abstract
The invention discloses a device and a method for detecting the bubble amount of cooling water vapor of an engine, wherein the detection method comprises the following steps: the bubble identification software reads an image of the water-gas mixture in the transparent quartz tube from the high-definition camera; converting the image into a gray image by using bubble identification software; and the bubble identification software carries out noise reduction processing on the gray level image. Carrying out contour detection on bubbles in the gray level image by using bubble identification software, and calculating to obtain the number of the bubbles; and calculating the volume of the air bubble by the air bubble identification software according to the size of the air bubble outline. The method for detecting the bubble amount of the engine cooling water can identify the bubbles in the engine cooling water, and can identify the number of the bubbles and the diameter and the volume of the bubbles.
Description
Technical Field
The invention relates to the field of detection of bubble amount in a cooling water pipeline, in particular to a method for detecting the bubble amount of cooling water of an engine.
Background
Forced degassing circulation systems of automobile engines are standard fittings of automobile factories from the beginning of the nineties, but degassing capacity and bubble quantity are used as performance indexes of the systems, and effective detection means are lacked all the time. The existing engine adopts high-temperature cooling and EGR technology, air bubbles generated by partial boiling of a water jacket are allowed to exist in a cooling water system circulation, so that the working load of a forced degassing circulation system of an automobile engine is greatly increased, and the degassing capability faces new challenges. A large amount of bubbles generated by local boiling can cause serious insufficiency of water flow to a great extent, thereby affecting the cooling function of an engine, and can cause faults such as heat crack of a cylinder cover bottom plate, cracking of an EGR cooler and the like in serious cases, so that a bubble amount detection method of engine cooling water is developed and established, and a bubble amount risk key item evaluation and verification means is provided for the development of the engine. At present, a method for detecting the bubble amount of engine cooling water is mainly realized by detecting the void fraction in the cooling water.
The method for detecting the void fraction in the cooling water in the prior art mainly comprises the following steps:
1. a rapid valve closing method: and two quick cut-off valves are arranged in a front section and a rear section of the pipeline, the two cut-off valves are quickly closed during detection, a section of fluid containing bubbles is obtained by intercepting, the volume Vl of the fluid in the section of fluid is weighed, and the volume Vg of the bubbles is obtained by subtracting Vl from the total flow volume Vt between the two quick cut-off valves.
2. A capacitance method: the liquid and the gas have different dielectric constants, when the concentration of the gas in the liquid and the distribution of the gas in the liquid are changed, the equivalent dielectric constant of the fluid containing the bubbles is changed, so that the measured capacitance value of the fluid containing the bubbles is changed, and the size of the capacitance value reflects the size and the distribution condition of the content of the bubbles.
3. A system pressure fluctuation detection method: aiming at the characteristic that the pressure of an engine closed water system is controlled by a pressure valve, the corresponding bubble generation amount can be calculated by measuring the fluctuation of the system pressure and through a proper algorithm. The change of the system pressure is caused by the volume change of the cooling liquid, the volume change of the system cooling liquid can be obtained through the measurement of the system pressure change and the conversion of an algorithm, and then the amount of bubbles generated by the engine can be calculated.
4. A water flow fluctuation detection method: when the engine reaches a thermal equilibrium state at a rated power point and a maximum torque point respectively, the two working conditions with the highest thermal load risk are adopted, and the air bubble amount is correspondingly maximized. When the degassing capacity of the rack degassing system is good, in the transparent observation tube of the expansion water tank return water tube, the return water is clear, when the bubbles are confirmed to be discharged, the water inlet flow of the engine is recorded, then the degassing circulating water flow in the degassing tube is blocked, the bubbles do not pass through the steam-water separation link of the expansion water tank, are all left in the cooling system of the engine to circulate, and after entering the water pump, the water flow of the engine is changed, the changed water flow is recorded, and is subtracted from the water flow under the condition that the bubbles are discharged, and the difference value is the bubble amount under the working condition. The characteristic relation between the water pump flow and the bubble quantity can be obtained through a water pump performance test table test, and the bubble quantity is converted through comparison. The interim error may be corrected by empirical parameters.
The detection precision of the methods is low, the installation is complex, some methods need special equipment for customizing the size of the cooling water pipe of the engine, and the methods cannot detect the number of the bubbles.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a device and a method for detecting the bubble amount of engine cooling water, which can identify bubbles in the engine cooling water and can identify the number of the bubbles and the diameter and the volume of the bubbles.
In order to achieve the purpose, the invention provides a device for detecting the amount of cooling water vapor bubbles of an engine, which comprises a transparent quartz tube, an expansion water tank and a water tank, wherein the transparent quartz tube is connected with the engine and the expansion water tank through a degassing pipeline; and the high-definition camera is connected with the processor through a cable, and the processor is internally provided with bubble identification software.
In a preferred embodiment, the lens of the high definition camera is aligned with the transparent quartz tube.
In order to achieve the above object, the present invention provides a method for detecting an amount of engine cooling water vapor bubbles, using the above detection device, the method comprising: the bubble identification software reads an image of the water-gas mixture in the transparent quartz tube from the high-definition camera; converting the image into a gray image by using bubble identification software; carrying out noise reduction processing on the gray level image by using bubble identification software; carrying out contour detection on bubbles in the gray level image by using bubble identification software, and calculating to obtain the number of the bubbles; and calculating the volume of the air bubble by the air bubble identification software according to the size of the air bubble outline.
In a preferred embodiment, the detection method further comprises: the bubble rate in the cooling water was obtained by dividing the volume of the bubbles by the flow volume of the transparent quartz tube.
Compared with the prior art, the detection device and the detection method for the bubble quantity of the engine cooling water can identify the bubble quantity and the bubble volume of the engine cooling water on line in real time, and provide a test and monitoring means for the control index of the bubble quantity of the cooling water in the efficient boiling heat exchange technology of the engine.
Drawings
FIG. 1 is a schematic structural diagram of a detection apparatus according to an embodiment of the present invention;
FIG. 2 is a bubble image of a detection method according to an embodiment of the present invention;
fig. 3 is a flowchart of bubble image recognition of a detection method according to an embodiment of the present invention.
Description of the main reference numerals:
1-a processor, 2-a high-definition camera, 3-a transparent quartz tube, 4-an expansion water tank, 5-a degassing pipeline and 6-an engine.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a detection apparatus according to an embodiment of the present invention. According to a preferred embodiment of the present invention, an apparatus for detecting the amount of engine cooling water vapor bubbles includes: the engine 6 is connected with the expansion water tank 4 through the degassing pipe 5 and the transparent quartz tube 3. The lens of the high-definition camera 2 is right opposite to the transparent quartz tube 3. The high-definition camera 2 transmits the acquired image to the processor 1 installed with the bubble recognition software through a cable. When the engine runs, gas generated in the cooling water system flows to the expansion water tank 4 through the transparent quartz tube 3 of the degassing tube 5 in the form of water-gas mixture. When the water-gas mixture flows through the transparent quartz tube 3, the high-definition camera 2 collects images of the water-gas mixture and transmits the images to the processor 1, and the bubble amount is identified and calculated by the bubble identification software.
As shown in fig. 1, fig. 2 is a flow chart of bubble image recognition of a detection method according to an embodiment of the present invention. According to a preferred embodiment of the present invention, a method for detecting the amount of engine cooling water vapor bubbles using the above detection device, the method includes: the bubble identification software reads an image of the water-gas mixture in the transparent quartz tube 3 from the high-definition camera 2; converting the image into a gray image by using bubble identification software; and the bubble identification software carries out noise reduction processing on the gray level image. Carrying out contour detection on bubbles in the gray level image by using bubble identification software, and calculating to obtain the number of the bubbles; the bubble identification software obtains the volume of the bubbles through calculation according to the size of the bubble outline; and finally, dividing the volume of the bubbles by the flow volume of the transparent quartz tube to obtain the bubble rate in the cooling water.
In summary, the device and the method for detecting the amount of bubbles in engine cooling water according to the present invention can identify the number of bubbles and the diameter of the bubbles by identifying the bubbles in the engine cooling water using the bubble identification software by using a visual identification method, thereby calculating the amount of bubbles in the engine cooling water. The method has the characteristics of low cost, convenience in installation, real-time dynamic detection and high detection precision.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (4)
1. A detection device for detecting the amount of bubbles in engine cooling water, comprising:
the transparent quartz tube is connected with the engine and the expansion water tank through a degassing pipeline; and
and the high-definition camera is connected with the processor through a cable, and the processor is internally provided with bubble identification software.
2. The apparatus for detecting the amount of engine-cooling water vapor bubbles according to claim 1, wherein a lens of the high-definition camera is aligned with the transparent quartz tube.
3. A method for detecting the amount of engine cooling water vapor bubbles is characterized by comprising the following steps:
the bubble identification software reads an image of the water-gas mixture in the transparent quartz tube from the high-definition camera;
the bubble identification software converts the image into a gray image;
the bubble identification software carries out noise reduction processing on the gray level image;
the bubble identification software carries out contour detection on bubbles in the gray level image and obtains the number of the bubbles through calculation; and
and the bubble identification software obtains the volume of the bubbles through calculation according to the size of the bubble outline.
4. The method for detecting the amount of engine-cooling water vapor bubbles according to claim 3, further comprising: and dividing the volume of the bubbles by the flow volume of the transparent quartz tube to obtain the bubble rate in the cooling water.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911405923.4A CN111104926A (en) | 2019-12-31 | 2019-12-31 | Device and method for detecting bubble amount of cooling water vapor of engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911405923.4A CN111104926A (en) | 2019-12-31 | 2019-12-31 | Device and method for detecting bubble amount of cooling water vapor of engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112733604A (en) * | 2020-12-08 | 2021-04-30 | 宁波汇纳机械有限公司 | Cooling liquid impurity detection platform and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008057340A (en) * | 2006-08-29 | 2008-03-13 | Toyota Motor Corp | Exhaust gas heat recovering device of internal combustion engine |
| CN202710481U (en) * | 2012-07-11 | 2013-01-30 | 长安大学 | Device for identifying and measuring air bubble in high-concentration dispersed multiphase flow |
| JP2016145556A (en) * | 2015-02-09 | 2016-08-12 | トヨタ自動車株式会社 | Cooling water control device |
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2019
- 2019-12-31 CN CN201911405923.4A patent/CN111104926A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008057340A (en) * | 2006-08-29 | 2008-03-13 | Toyota Motor Corp | Exhaust gas heat recovering device of internal combustion engine |
| CN202710481U (en) * | 2012-07-11 | 2013-01-30 | 长安大学 | Device for identifying and measuring air bubble in high-concentration dispersed multiphase flow |
| JP2016145556A (en) * | 2015-02-09 | 2016-08-12 | トヨタ自動車株式会社 | Cooling water control device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112733604A (en) * | 2020-12-08 | 2021-04-30 | 宁波汇纳机械有限公司 | Cooling liquid impurity detection platform and method |
| CN112733604B (en) * | 2020-12-08 | 2022-11-22 | 黑龙江省爱格机械产品检测有限公司 | Cooling liquid impurity detection platform and method |
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