阅读说明：本技术 挡风玻璃除雾装置的质检方法、装置及存储介质 (Quality inspection method and device for windshield defogging device and storage medium ) 是由 郑博铭 邹朝辉 黄宗浩 杜烨 欧阳惠龙 于 2021-08-12 设计创作，主要内容包括：本发明提供了一种挡风玻璃除雾装置的质检方法、质检装置及计算机可读存储介质,挡风玻璃除雾检装置的质检方法包括获取挡风玻璃的热图像；根据热图像获取挡风玻璃上电阻丝的分布状态；根据分布状态计算挡风玻璃上电阻丝的数量；根据分布状态以及数量生成检测结果。本发明技术方案通过在车辆开启挡风玻璃除雾装置时,通过热成像技术拍摄挡风玻璃的热图像,根据热图像计算出挡风玻璃上电阻丝的数量以及分布状态,以分析车辆的除雾装置是否正常。从而仅通过热图像进行检测,降低检测成本,提高检测的兼容性。(The invention provides a quality inspection method of a windshield defogging device, the quality inspection device and a computer readable storage medium, wherein the quality inspection method of the windshield defogging device comprises the steps of acquiring a thermal image of a windshield; acquiring the distribution state of the resistance wires on the windshield according to the thermal image; calculating the number of the resistance wires on the windshield according to the distribution state; and generating a detection result according to the distribution state and the quantity. According to the technical scheme, when the defogging device for the windshield is started, the thermal image of the windshield is shot through the thermal imaging technology, and the number and the distribution state of the resistance wires on the windshield are calculated according to the thermal image so as to analyze whether the defogging device for the windshield is normal or not. Therefore, detection is carried out only through the thermal image, the detection cost is reduced, and the detection compatibility is improved.)

1. A quality inspection method of a windshield defogging device is characterized by comprising the following steps:

acquiring a thermal image of the windshield;

acquiring the distribution state of the resistance wires on the windshield according to the thermal image;

calculating the number of the resistance wires on the windshield according to the distribution state;

and generating a detection result according to the distribution state and the quantity.

2. The quality inspection method according to claim 1, wherein the step of obtaining the distribution state of the wires on the windshield from the thermal image comprises:

acquiring pixel points on a preset straight line on the thermal image, wherein the preset straight line is intersected with a resistance wire on a windshield;

acquiring temperature information of the pixel points according to the thermal image;

and acquiring the distribution state according to the temperature information.

3. The quality inspection method according to claim 2, wherein the step of obtaining the distribution state based on the temperature information includes:

acquiring the variation trend of the temperature information on the preset straight line;

generating a temperature distribution map according to the temperature information and the variation trend;

and acquiring the distribution state according to the temperature distribution diagram.

4. The quality inspection method according to claim 3, wherein the step of obtaining the distribution state from the temperature distribution map comprises:

and when the temperature information is wavy on the temperature distribution diagram, determining that the resistance wires on the windshield are distributed at intervals along the extension direction of the preset straight line.

5. The quality inspection method according to claim 3, wherein the step of calculating the number of wires on the windshield based on the distribution state includes:

and when the temperature information is wavy on the temperature distribution diagram, determining the number of the resistance wires on the windshield according to the number of wave crests on the temperature distribution diagram.

6. The quality inspection method according to claim 1, further comprising, after the step of generating the inspection result according to the distribution state and the quantity:

comparing the detection result with preset parameters;

acquiring quality information of the resistance wire on the windshield according to the comparison result;

storing the quality information.

7. The quality inspection method according to claim 6, wherein the step of obtaining the quality information of the resistance wire on the windshield based on the comparison result includes:

when the preset distribution state in the preset parameters is the same as the distribution state and the preset number in the preset parameters is the same as the number, judging that the quality of the resistance wire on the windshield is qualified;

and when the preset distribution state in the preset parameters is different from the distribution state or the preset quantity in the preset parameters is different from the quantity, judging that the quality of the resistance wire on the windshield is unqualified.

8. The quality inspection method according to claim 1, wherein the step of acquiring the thermal image of the windshield is preceded by the step of:

acquiring vehicle information on a detection station;

when the vehicle information is detected, the vehicle information is stored, and the step of acquiring a thermal image of the windshield is performed.

9. A quality inspection apparatus comprising a thermal imaging camera, a memory, a processor, and a quality inspection program stored on the memory and executable on the processor, wherein:

the thermal imaging camera is used for shooting a thermal image of the resistance wire on the windshield;

the quality inspection program when executed by the processor implements the steps of the quality inspection method according to any one of claims 1 to 8.

10. A computer-readable storage medium, having a quality inspection program stored thereon, which when executed by a processor, implements the steps of the quality inspection method of any one of claims 1 to 8.

Technical Field

The invention relates to the technical field of automobile manufacturing, in particular to a quality inspection method and a quality inspection device for a windshield defogging device and a computer readable storage medium.

Background

Along with the improvement of the driving safety requirement of the whole automobile, more and more automobiles are provided with a rear windshield defogging function. The defogging function is realized by electrifying and heating a resistance wire in the rear windshield. The defogging function of the rear windshield also has different detection means in the whole vehicle manufacturing enterprise.

In the prior art, detection is generally carried out by touching the temperature of the windshield with a human hand after turning on the defogging function. The detection means is easily influenced by the state of an inspector, so that the inspection is missed and misjudged, and the detection guarantee degree is not high. Secondly, also can be when opening the defogging function, whether the resistance wire successfully circular telegram is judged to magnetic flux when detecting the resistance wire circular telegram through electromagnetic induction sensor to whether detect the defogging function and be normal. Such a detection means is limited by the inspection range of the electromagnetic sensor, and when the vehicle height difference is large, it is impossible to share the detection means, and it is necessary to use a plurality of sensors corresponding to different vehicle types. In addition, the electromagnetic induction sensor is expensive, and the detection result is difficult to quantify numerically.

Disclosure of Invention

The invention mainly aims to provide a quality inspection method and a quality inspection device of a windshield defogging device and a computer readable storage medium, and aims to solve the technical problems of low flexibility and high cost of the windshield defogging device in the prior art during quality inspection.

In order to achieve the above object, the present invention provides a quality inspection method for a windshield defogging device, including:

acquiring a thermal image of the windshield;

acquiring the distribution state of the resistance wires on the windshield according to the thermal image;

calculating the number of the resistance wires on the windshield according to the distribution state;

and generating a detection result according to the distribution state and the quantity.

Optionally, the step of acquiring the distribution state of the wires on the windshield from the thermal image includes:

acquiring pixel points on a preset straight line on the thermal image, wherein the preset straight line is intersected with a resistance wire on a windshield;

acquiring temperature information of the pixel points according to the thermal image;

and acquiring the distribution state according to the temperature information.

Optionally, the step of obtaining the distribution state according to the temperature information includes:

acquiring the variation trend of the temperature information on the preset straight line;

generating a temperature distribution map according to the temperature information and the variation trend;

and acquiring the distribution state according to the temperature distribution diagram.

Optionally, the step of obtaining the distribution state according to the temperature distribution map includes:

and when the temperature information is wavy on the temperature distribution diagram, determining that the resistance wires on the windshield are distributed at intervals along the extension direction of the preset straight line.

Optionally, the step of calculating the number of wires on the windshield according to the distribution state includes:

and when the temperature information is wavy on the temperature distribution diagram, determining the number of the resistance wires on the windshield according to the number of wave crests on the temperature distribution diagram.

Optionally, after the step of generating the detection result according to the distribution state and the number, the method further includes:

comparing the detection result with preset parameters;

acquiring quality information of the resistance wire on the windshield according to the comparison result;

storing the quality information.

Optionally, the step of obtaining quality information of the resistance wire on the windshield according to the comparison result includes:

when the preset distribution state in the preset parameters is the same as the distribution state and the preset number in the preset parameters is the same as the number, judging that the quality of the resistance wire on the windshield is qualified;

and when the preset distribution state in the preset parameters is different from the distribution state or the preset quantity in the preset parameters is different from the quantity, judging that the quality of the resistance wire on the windshield is unqualified.

Optionally, the step of acquiring a thermal image of the windshield further comprises, before the step of acquiring a thermal image of the windshield:

acquiring vehicle information on a detection station;

when the vehicle information is detected, the vehicle information is stored, and the step of acquiring a thermal image of the windshield is performed.

In addition, in order to solve the above problems, the present invention further provides a quality inspection apparatus, which includes a thermal imaging camera, a memory, a processor, and a quality inspection program stored in the memory and operable on the processor, wherein:

the thermal imaging camera is used for shooting a thermal image of the resistance wire on the windshield;

the quality inspection program realizes the steps of the quality inspection method when being executed by the processor.

In addition, to solve the above problem, the present invention further provides a computer-readable storage medium, on which a quality inspection program is stored, and the quality inspection program, when executed by a processor, implements the steps of the quality inspection method as described above.

According to the technical scheme, when the defogging device for the windshield is started, the thermal image of the windshield is shot through the thermal imaging technology, and the number and the distribution state of the resistance wires on the windshield are calculated according to the thermal image so as to analyze whether the defogging device for the windshield is normal or not. Therefore, detection is carried out only through the thermal image, the detection cost is reduced, and the detection compatibility is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic flow chart illustrating a first embodiment of a quality inspection method for a defogging device of a windshield according to the present invention;

FIG. 2 is a schematic flow chart illustrating a quality control method of a defogging device for a windshield according to a second embodiment of the present invention;

FIG. 3 is a schematic flow chart illustrating a quality control method of a defogging device for a windshield according to a third embodiment of the present invention;

fig. 4 is a schematic flow chart illustrating a quality inspection method for a defogging device of a windshield according to a fourth embodiment of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a quality inspection method of a windshield defogging device, and please refer to fig. 1, wherein fig. 1 is a schematic flow chart of a first embodiment of the quality inspection method, and the quality inspection method of the windshield defogging device comprises the following steps:

step S10: acquiring a thermal image of the windshield;

step S20: acquiring the distribution state of the resistance wires on the windshield according to the thermal image;

step S30: calculating the number of the resistance wires on the windshield according to the distribution state;

step S40: and generating a detection result according to the distribution state and the quantity.

The defogging device of vehicle means that the even interval sets up a plurality of resistance wires on the windshield of vehicle, and after the defogging device of vehicle opened, the resistance wire that the windshield contains can begin to heat, and the heat of resistance wire conducts to glass to make water smoke evaporation, realize the defogging. Meanwhile, according to the heat conduction principle, the temperature of the position, closest to the resistance wire, on the windshield is the highest, and the change trend of the temperature gradually decreases gradually towards the two sides of the resistance wire.

In order to further improve the automation degree of the quality inspection method of the present invention, the inspection can be directly performed on a production line of a vehicle, and specifically, before step S10, the method further includes the following steps:

step S50: acquiring vehicle information on a detection station;

step S60: when the vehicle information is detected, the vehicle information is stored, and the step of acquiring a thermal image of the windshield is performed.

A quality inspection station is arranged on a production line of the vehicle, and whether the vehicle reaches the quality inspection station is detected by arranging a sensor. For example, a pressure sensor can be arranged on the quality inspection station, and the pressure sensor receives a pressure signal of the vehicle when the vehicle moves to the quality inspection station, so that the vehicle to be detected is judged to reach the quality inspection station; or a camera can be arranged on the quality inspection station, and whether the vehicle reaches the quality inspection station or not can be visually judged by acquiring the image information of the quality inspection station. And when the vehicle reaches the quality inspection station, the defogging device of the vehicle is subjected to quality inspection.

In addition, RFID label information can be set on the vehicle, the vehicle information is identified through the reader and stored in the memory, and after the quality inspection is finished, the detection result of the part of the object to be inspected is related to the corresponding RFID label, so that the operator can trace the quality inspection result and judge which vehicle has quality problems.

It should be noted that, in the present invention, the thermal image of the windshield is obtained for detection, and therefore the defogging device of the vehicle needs to be turned on before the detection, in this embodiment, the defogging device may be turned on in advance by manual intervention, or may be turned on by remote control in a wifi manner, for example, and after waiting for a certain preset time (for example, 20 seconds), step S10 is executed again, so as to improve the accuracy of the detection.

After the thermal image is obtained, the temperature distribution condition on the windshield is obtained according to the thermal image, the temperature between two adjacent resistance wires is in a descending trend according to the heat conduction principle, and the temperature at the position of the resistance wire is the highest. Therefore, the distribution state and the number of the resistance wires can be analyzed according to the temperature distribution condition on the thermal image. Aiming at vehicles of different models, the distribution state and the number of the arranged resistance wires are different. In this embodiment, the detected distribution state is compared with the number, so that whether all resistance wires on the vehicle normally work can be known, and when the distribution state and the number are not in accordance with the expectation of the vehicle, it indicates that the defogging device of the vehicle has a quality problem.

It can be understood that, in this embodiment, in order to avoid misjudgment, a preset temperature value may be set, and when the temperature on the thermal image is lower than the preset temperature value, the position indicates the non-resistance wire region, so as to prevent the interference of the windshield frame from affecting the detection accuracy.

In order to further improve the automation degree of the quality inspection method, the detection result is obtained and then directly compared, specifically, after the step S40, the method further includes the following steps:

step S70: comparing the detection result with preset parameters;

step S80: acquiring quality information of the resistance wire on the windshield according to the comparison result;

step S90: storing the quality information.

Before detection, preset parameters of the vehicle to be detected are stored in the system, and the preset parameters of the vehicle to be detected can comprise the preset number, the preset distribution state and the like of the resistance wires on the windshield of the vehicle. And after the detection result is generated, comparing the detection result with preset parameters to judge whether the defogging device on the vehicle can normally operate or not and whether the installation quantity and the installation distribution of the resistance wires meet the expectation or not. Specifically, when a preset distribution state in the preset parameters is the same as the distribution state and a preset number in the preset parameters is the same as the number, judging that the quality of the resistance wire on the windshield is qualified; and when the preset distribution state in the preset parameters is different from the distribution state or the preset quantity in the preset parameters is different from the quantity, judging that the quality of the resistance wire on the windshield is unqualified.

According to the technical scheme, when the defogging device for the windshield is started, the thermal image of the windshield is shot through the thermal imaging technology, and the number and the distribution state of the resistance wires on the windshield are calculated according to the thermal image so as to analyze whether the defogging device for the windshield is normal or not. Therefore, detection is carried out only through the thermal image, the detection cost is reduced, and the detection compatibility is improved.

Further, referring to fig. 2, fig. 2 is a flowchart illustrating a second embodiment of the quality inspection method according to the present invention, and step S20 includes the following steps:

step S21: acquiring pixel points on a preset straight line on the thermal image, wherein the preset straight line is intersected with a resistance wire on a windshield;

step S22: acquiring temperature information of the pixel points according to the thermal image;

step S23: and acquiring the distribution state according to the temperature information.

In this embodiment, after the thermal image is acquired, one preset straight line is selected from the thermal image, and the preset straight line is intersected with the resistance wire. It should be noted that, in order to ensure the uniformity of defogging of the vehicle, the resistance wires are arranged on the windshield in a manner of uniform interval distribution. Therefore, after the preset straight line is selected, the preset straight line is perpendicular to the intersection of the resistance wires, so that each resistance wire can pass through the extension line of the preset straight line.

And after the preset straight line is selected, acquiring the temperature information of each pixel point on the preset straight line through the thermal image. According to the heat conduction principle, the temperature of the position, closest to the resistance wire, on the windshield is highest, and the change trend of the temperature gradually decreases gradually towards the two sides of the resistance wire. And the preset straight line passes through each resistance wire in sequence, so that the temperature information on each pixel point on the preset straight line can generate continuous fluctuation change.

When the temperature information on each pixel point on the preset straight line is detected to have continuous fluctuation, the selected preset straight line passes through each resistance wire once. In the embodiment, the preset straight line and the resistance wire are vertically arranged as an example for explanation, so that the distribution condition of the resistance wire is reversely deduced. Specifically, when the preset straight line is selected along the length direction of the windshield, the resistance wires are uniformly arranged at intervals along the width direction of the windshield; when the preset straight line is selected along the width direction of the windshield, the resistance wires are arranged at equal intervals along the length direction of the windshield.

Further, referring to fig. 3, fig. 3 is a flowchart illustrating a third embodiment of the quality inspection method according to the present invention, wherein step S23 includes the following steps:

step S231: acquiring the variation trend of the temperature information on the preset straight line;

step S232: generating a temperature distribution map according to the temperature information and the variation trend;

step S233: and acquiring the distribution state according to the temperature distribution diagram.

According to the above, the temperature information on each pixel point on the preset line may have continuous fluctuation. Therefore, in this embodiment, the pixel points on the preset straight line are taken as the X axis, the temperature information is taken as the Y axis to generate a coordinate system, and any direction of the preset straight line is taken as a reference, and the temperature information corresponding to each pixel point is sequentially identified in the coordinate system, so as to generate the temperature distribution map.

In this embodiment, in order to improve the detection accuracy of the quality inspection method according to the present invention. When the temperature distribution diagram is distributed in a similar sine wave shape, the selected preset straight line sequentially passes through each resistance wire, namely when the temperature information is in a wave shape on the temperature distribution diagram, the resistance wires on the windshield are determined to be distributed at intervals along the extending direction of the preset straight line; however, when the temperature distribution diagram is a stable straight line, the selected preset straight line does not pass through any resistance wire, namely the direction of the preset straight line is selected wrongly, and an alarm is sent out in time to prompt an operator to adjust in time.

Further, referring to fig. 4, fig. 4 is a flowchart illustrating a fourth embodiment of the quality inspection method according to the present invention, wherein step S30 includes the following steps:

step S31: and when the temperature information is wavy on the temperature distribution diagram, determining the number of the resistance wires on the windshield according to the number of wave crests on the temperature distribution diagram.

According to the above, according to the heat conduction principle, the temperature of the position on the windshield closest to the resistance wire is the highest, and the change trend of the temperature gradually decreases gradually towards the two sides of the resistance wire. Therefore, in the embodiment, the number of the peaks on the temperature distribution diagram, that is, the position where the temperature of the preset straight line passes through is the highest, that is, the position where the resistance wire is located, is identified, so that the number of the resistance wires can be determined according to the number of the peaks on the temperature distribution diagram, that is, the number of the peaks is the number of the resistance wires.

For convenience of computer identification, the resistance value of the resistance wire mounted on the vehicle can be obtained according to the vehicle model, a peak detection radius R is set according to the resistance value of the resistance wire, the pixel point on the preset straight line is taken as i, the temperature from the point i-R to the point i + R is obtained and compared with the temperature of i, and if the temperature of i is the highest, the temperature is taken as the peak point.

In addition, in order to solve the above problems, the present invention further provides a quality inspection apparatus, which includes a thermal imaging camera, a memory, a processor, and a quality inspection program stored in the memory and operable on the processor, wherein:

the thermal imaging camera is used for shooting a thermal image of the resistance wire on the windshield;

the quality inspection program realizes the steps of the quality inspection method when being executed by the processor.

The defogging device of vehicle means that the even interval sets up a plurality of resistance wires on the windshield of vehicle, and after the defogging device of vehicle opened, the resistance wire that the windshield contains can begin to heat, and the heat of resistance wire conducts to glass to make water smoke evaporation, realize the defogging. Meanwhile, according to the heat conduction principle, the temperature of the position, closest to the resistance wire, on the windshield is the highest, and the change trend of the temperature gradually decreases gradually towards the two sides of the resistance wire.

In order to further improve the automation degree of the quality inspection method, the vehicle production line can be directly used for detecting, a quality inspection station is arranged on the vehicle production line, and a sensor is arranged for detecting whether the vehicle reaches the quality inspection station. For example, a pressure sensor can be arranged on the quality inspection station, and the pressure sensor receives a pressure signal of the vehicle when the vehicle moves to the quality inspection station, so that the vehicle to be detected is judged to reach the quality inspection station; or a camera can be arranged on the quality inspection station, and whether the vehicle reaches the quality inspection station or not can be visually judged by acquiring the image information of the quality inspection station. And when the vehicle reaches the quality inspection station, the defogging device of the vehicle is subjected to quality inspection.

In addition, RFID label information can be set on the vehicle, the vehicle information is identified through the reader and stored in the memory, and after the quality inspection is finished, the detection result of the part of the object to be inspected is related to the corresponding RFID label, so that the operator can trace the quality inspection result and judge which vehicle has quality problems.

It should be noted that, in the present invention, the thermal image of the windshield is obtained for detection, so that the defogging device of the vehicle needs to be turned on before the detection, in this embodiment, the defogging device may be turned on in advance by manual intervention, or may be turned on by remote control in a wifi manner, for example, and after waiting for a certain preset time (for example, 20 seconds), the thermal image of the windshield is obtained, so as to improve the accuracy of the detection.

After the thermal image is obtained, the temperature distribution condition on the windshield is obtained according to the thermal image, the temperature between two adjacent resistance wires is in a descending trend according to the heat conduction principle, and the temperature at the position of the resistance wire is the highest. Therefore, the distribution state and the number of the resistance wires can be analyzed according to the temperature distribution condition on the thermal image. Aiming at vehicles of different models, the distribution state and the number of the arranged resistance wires are different. In this embodiment, the detected distribution state is compared with the number, so that whether all resistance wires on the vehicle normally work can be known, and when the distribution state and the number are not in accordance with the expectation of the vehicle, it indicates that the defogging device of the vehicle has a quality problem.

It can be understood that, in this embodiment, in order to avoid misjudgment, a preset temperature value may be set, and when the temperature on the thermal image is lower than the preset temperature value, the position indicates the non-resistance wire region, so as to prevent the interference of the windshield frame from affecting the detection accuracy.

In order to further improve the automation degree of the quality inspection method, the detection result is directly compared, and the preset parameters of the vehicle to be inspected are stored in the system before the detection, wherein the preset parameters of the vehicle to be inspected can comprise the preset number, the preset distribution state and the like of the resistance wires on the windshield of the vehicle. And after the detection result is generated, comparing the detection result with preset parameters to judge whether the defogging device on the vehicle can normally operate or not and whether the installation quantity and the installation distribution of the resistance wires meet the expectation or not. Specifically, when a preset distribution state in the preset parameters is the same as the distribution state and a preset number in the preset parameters is the same as the number, judging that the quality of the resistance wire on the windshield is qualified; and when the preset distribution state in the preset parameters is different from the distribution state or the preset quantity in the preset parameters is different from the quantity, judging that the quality of the resistance wire on the windshield is unqualified.

According to the technical scheme, when the defogging device for the windshield is started, the thermal image of the windshield is shot through the thermal imaging technology, and the number and the distribution state of the resistance wires on the windshield are calculated according to the thermal image so as to analyze whether the defogging device for the windshield is normal or not. Therefore, detection is carried out only through the thermal image, the detection cost is reduced, and the detection compatibility is improved.

In addition, to solve the above problem, the present invention further provides a computer-readable storage medium, on which a quality inspection program is stored, and the quality inspection program, when executed by a processor, implements the steps of the quality inspection method as described above.

The defogging device of vehicle means that the even interval sets up a plurality of resistance wires on the windshield of vehicle, and after the defogging device of vehicle opened, the resistance wire that the windshield contains can begin to heat, and the heat of resistance wire conducts to glass to make water smoke evaporation, realize the defogging. Meanwhile, according to the heat conduction principle, the temperature of the position, closest to the resistance wire, on the windshield is the highest, and the change trend of the temperature gradually decreases gradually towards the two sides of the resistance wire.

In order to further improve the automation degree of the quality inspection method, the vehicle production line can be directly used for detecting, a quality inspection station is arranged on the vehicle production line, and a sensor is arranged for detecting whether the vehicle reaches the quality inspection station. For example, a pressure sensor can be arranged on the quality inspection station, and the pressure sensor receives a pressure signal of the vehicle when the vehicle moves to the quality inspection station, so that the vehicle to be detected is judged to reach the quality inspection station; or a camera can be arranged on the quality inspection station, and whether the vehicle reaches the quality inspection station or not can be visually judged by acquiring the image information of the quality inspection station. And when the vehicle reaches the quality inspection station, the defogging device of the vehicle is subjected to quality inspection.

In addition, RFID label information can be set on the vehicle, the vehicle information is identified through the reader and stored in the memory, and after the quality inspection is finished, the detection result of the part of the object to be inspected is related to the corresponding RFID label, so that the operator can trace the quality inspection result and judge which vehicle has quality problems.

It should be noted that, in the present invention, the thermal image of the windshield is obtained for detection, so that the defogging device of the vehicle needs to be turned on before the detection, in this embodiment, the defogging device may be turned on in advance by manual intervention, or may be turned on by remote control in a wifi manner, for example, and after waiting for a certain preset time (for example, 20 seconds), the thermal image of the windshield is obtained, so as to improve the accuracy of the detection.

After the thermal image is obtained, the temperature distribution condition on the windshield is obtained according to the thermal image, the temperature between two adjacent resistance wires is in a descending trend according to the heat conduction principle, and the temperature at the position of the resistance wire is the highest. Therefore, the distribution state and the number of the resistance wires can be analyzed according to the temperature distribution condition on the thermal image. Aiming at vehicles of different models, the distribution state and the number of the arranged resistance wires are different. In this embodiment, the detected distribution state is compared with the number, so that whether all resistance wires on the vehicle normally work can be known, and when the distribution state and the number are not in accordance with the expectation of the vehicle, it indicates that the defogging device of the vehicle has a quality problem.

It can be understood that, in this embodiment, in order to avoid misjudgment, a preset temperature value may be set, and when the temperature on the thermal image is lower than the preset temperature value, the position indicates the non-resistance wire region, so as to prevent the interference of the windshield frame from affecting the detection accuracy.

In order to further improve the automation degree of the quality inspection method, the detection result is directly compared, and the preset parameters of the vehicle to be inspected are stored in the system before the detection, wherein the preset parameters of the vehicle to be inspected can comprise the preset number, the preset distribution state and the like of the resistance wires on the windshield of the vehicle. And after the detection result is generated, comparing the detection result with preset parameters to judge whether the defogging device on the vehicle can normally operate or not and whether the installation quantity and the installation distribution of the resistance wires meet the expectation or not. Specifically, when a preset distribution state in the preset parameters is the same as the distribution state and a preset number in the preset parameters is the same as the number, judging that the quality of the resistance wire on the windshield is qualified; and when the preset distribution state in the preset parameters is different from the distribution state or the preset quantity in the preset parameters is different from the quantity, judging that the quality of the resistance wire on the windshield is unqualified.

According to the technical scheme, when the defogging device for the windshield is started, the thermal image of the windshield is shot through the thermal imaging technology, and the number and the distribution state of the resistance wires on the windshield are calculated according to the thermal image so as to analyze whether the defogging device for the windshield is normal or not. Therefore, detection is carried out only through the thermal image, the detection cost is reduced, and the detection compatibility is improved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.