Cut-off line automatic calibration structure and method

Abstract

The invention provides a cut-off line automatic calibration structure and a cut-off line automatic calibration method. The cut-off line automatic calibration structure and the cut-off line automatic calibration method are used for at least solving calibration or safety problems in the prior art. The cut-off line automatic calibration method at least comprises the following steps that a vehicle lamp rotates to a first limit position in the first direction, and first limit position data at least including angle data is obtained; the vehicle lamp rotates to a second limit position in the second direction, and obtained second limit position data at least comprise angle data; and calculating an average value according to the first limit data and the second limit data to obtain a horizontal calibration angle. According to the technical scheme, the automobile lamp is automatically calibrated after being installed, the situation that the cut-off line of the automobile lamp cannot be kept in the horizontal state due to calibration deviation caused by tool position deviation is avoided, according to the technical scheme, after the automobile lamp is automatically calibrated, if the automobile lamp cannot be in the horizontal position, the first limiting position or the second limiting position can be changed for calibration again, and the calibration accuracy is improved. And the cut-off line of the calibrated vehicle lamp is in a horizontal position.

Description

Technical Field

[0001] This application relates to the technical field of headlight adjustment, and particularly to a cut-off line automatic calibration structure and method. Background Art

[0002] The HIAS structure (Horizontal Illumination Adjustment System), i.e., the horizontal illumination adjustment system, is an intelligent headlight system that can dynamically adjust the light distribution and intensity according to the driving state of the two-wheeler, the ambient light conditions, and the surrounding traffic conditions, thereby optimizing the lighting effect and enhancing driving safety and comfort. When the two-wheeler turns, it will make a circular centripetal motion around the inner side of the turn, causing the front of the vehicle to tilt, which in turn causes the headlight to tilt, and the illumination light pattern generated by the headlight will also tilt, resulting in the tilt of the cut-off line of the low beam and the lack of light on the inner side of the turn. The most basic function of the HIAS structure is to solve this problem. It can automatically calibrate the cut-off line so that the cut-off line always remains parallel to the horizontal ground, and the inner side of the turn can also have a lighting light distribution without adding additional lamp beads. However, currently, there is no relatively effective structure and method that can accurately determine the cut-off line as the standard horizontal position so that the cut-off line always remains parallel to the horizontal ground. In the prior art, the angle when the cut-off line of the headlight is horizontal is given at the time of factory production, but this angle is generally measured on a tooling, so the cut-off line at the standard horizontal may be tilted because the tooling is not placed horizontally and does not remain parallel to the ground. In this way, there will always be a certain angle between the vehicle and the ground when driving.

[0003] Even if it maintains a horizontal position, it may not be parallel to the ground. For a relatively curved position on a mountain road, the road surface may tilt at a certain angle. If the right side of the road surface is higher, even if the light cut-off line remains horizontal, the light may shine into the eyes of the driver on the left side, causing danger. Therefore, different road conditions require adjustment to different angles.

[0004] The Chinese patent number "CN110562364 A" with the patent name "A Control Method, Device, and Headlight for an Adaptive Steering Headlight" discloses a control method, device, and headlight for an adaptive steering headlight. The headlight can automatically adjust the headlight according to the vehicle speed, the side inclination angle and the front inclination angle of the headlight mounting seat, reducing the blind area during driving. However, it does not consider the safety of oncoming vehicles. That is, when the inclination angle of the road surface is relatively large, it determines the current state of the headlight mounting seat according to the inclination angle measured by the inclination detection device with respect to the horizontal plane. In this way, if the right side of the road is higher than the left side, the horizontal light may also exceed the safe height, causing danger to oncoming vehicles. Summary of the Invention This application provides a cut-off line automatic calibration structure and method to at least solve the calibration or safety problems existing in the prior art.

[0005] According to the first aspect of the present application, an automatic cut-off line calibration method is provided, which at least includes the following steps: After the vehicle lamp is installed, the vehicle lamp is rotated to the first limit position along the first direction, and the first limit position data is obtained, which at least includes angle data; The vehicle lamp is rotated to the second limit position along the second direction, and the second limit position data is obtained, which at least includes angle data; Calculate the average value according to the first limit data and the second limit data to obtain the horizontal calibration angle.

[0006] Compared with the prior art, the automatic cut-off line calibration method of the present application has the following beneficial effects: After the vehicle lamp is installed, automatic calibration is performed to avoid calibration deviation caused by the position deviation of the tooling, so that the cut-off line of the vehicle lamp cannot maintain a horizontal state. According to the technical solution of the present application, after the vehicle lamp is automatically calibrated, if it cannot be in a horizontal position, the first limit position or the second limit position can be changed to re-perform the calibration until the cut-off line of the vehicle lamp is in a horizontal position after calibration. In this way, when the vehicle running on the road surface is tilted, the tilt angle of the vehicle is obtained through sensors such as a gyroscope, and the motor is used to control the vehicle lamp to rotate in the reverse direction by a corresponding angle with the horizontal calibration angle as the initial angle.

[0007] According to the second aspect of the present application, an automatic cut-off line calibration method is provided, which at least includes the following steps: After the vehicle lamp is installed, the vehicle lamp is rotated to the first limit position along the first direction, and the first limit position data is obtained. The first limit position data at least includes distance data or angle data; The vehicle lamp is rotated to the second limit position along the second direction, and the second limit position data is obtained. The first limit position data at least includes distance data or angle data; Obtain the horizontal calibration angle and the horizontal calibration distance according to the first limit data and the second limit data; The horizontal calibration angle is the average value of the angle of the first limit position and the angle of the second limit position, and the horizontal calibration distance is the distance data obtained when the vehicle lamp is at the horizontal calibration angle.

[0008] Compared with the prior art, the automatic cut-off line calibration method of the present application has the following beneficial effects: The headlight is automatically calibrated after installation to avoid calibration deviation caused by the position deviation of the tooling, which may prevent the cut-off line of the headlight from remaining horizontal. According to the technical solution of this application, after the headlight is automatically calibrated, if it cannot be in a horizontal position, the first limit position or the second limit position can be changed to re-calibrate until the cut-off line of the headlight is horizontal after calibration. In this way, when the vehicle is tilted during driving on the road surface, the tilt angle of the vehicle can be obtained through sensors such as a gyroscope, and the motor is used to control the headlight to rotate in the reverse direction by a corresponding angle with the horizontal calibration angle as the initial angle. In addition, some road surfaces are in a non-horizontal state, especially on winding mountain roads, where the outer side is generally higher than the inner side. At this time, the cut-off line of the headlight is parallel to the road surface, and the light on the inner side is lower. Compared with the relatively horizontal cut-off line of the headlight, oncoming vehicles are less likely to be dazzled, making the oncoming vehicle safer. Although the distance sensor can accurately measure the distance, for uphill and downhill roads, even if the inner and outer sides of the road are at the same height, the distance measured by the distance sensor will change significantly. Therefore, it needs to be used in conjunction with other sensors, such as setting multiple distance sensors or setting angle sensors, etc.

[0009] In an implementable embodiment, the headlight uses two distance sensors on the left and right to measure the distances between the left and right sides and the ground. When the two distance sensors on the left and right obtain the same distance on a horizontal road surface, this distance can be recognized as the horizontal calibration distance. In this way, it is simpler to obtain the horizontal calibration distance.

[0010] In an implementable embodiment, when the vehicle is driving, if the distance data obtained by the left distance sensor is greater than the horizontal calibration distance and the distance data obtained by the right distance sensor is less than the horizontal calibration distance, the left side of the headlight rotates downward, that is, the right side of the headlight rotates upward; if the distance data obtained by the left distance sensor is less than the horizontal calibration distance and the distance data obtained by the right distance sensor is greater than the horizontal calibration distance, the left side of the headlight rotates upward, that is, the right side of the headlight rotates downward. This can ensure that the cut-off line is parallel to the road surface.

[0011] In an implementable embodiment, when the vehicle is driving, if the distance data obtained by the left distance sensor is greater than the distance data obtained by the right distance sensor, the left side of the headlight rotates downward, that is, the right side of the headlight rotates upward, until the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor; if the distance data obtained by the left distance sensor is less than the distance data obtained by the right distance sensor, the left side of the headlight rotates upward, that is, the right side of the headlight rotates downward, until the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor. This can make the cut-off line parallel to the road surface faster under complex road conditions.

[0012] In an implementable embodiment, if the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor and greater than the horizontal calibration distance, the irradiation angle of the vehicle lamp is reduced until the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor and equal to the horizontal calibration distance; if the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor and less than the horizontal calibration distance, the irradiation angle of the vehicle lamp is increased until the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor and equal to the horizontal calibration distance. In this way, when going uphill or downhill, it can be ensured that the cut-off line of the vehicle lamp is basically parallel to the road surface.

[0013] According to the third aspect of the present application, a cut-off line automatic calibration structure is provided, including a base, a lens module mounting bracket, and a driving motor. The driving motor drives the lens module mounting bracket to rotate relative to the base. The base is provided with a first limiting rib and a second limiting rib, and the lens module mounting bracket is provided with a first limiting end and a second limiting end. When the lens module mounting bracket rotates to the first extreme position along the first direction, the first limiting end abuts against the first limiting rib, and when the lens module mounting bracket rotates to the second extreme position along the second direction, the second limiting end abuts against the second limiting rib. This facilitates the cut-off line calibration after the vehicle lamp is installed.

[0014] According to the fourth aspect of the present application, a cut-off line automatic calibration structure is provided, including a base, a lens module mounting bracket, a driving motor, a first distance sensor, and a second distance sensor. The driving motor drives the lens module mounting bracket to rotate relative to the base. The lens module mounting bracket is provided with the first distance sensor and the second distance sensor. The first distance sensor and the second distance sensor are symmetrically arranged on the left and right sides of the center of the lens module mounting bracket. The first distance sensor can measure the distance between the left side of the lens module mounting bracket and the ground, and the second distance sensor can measure the distance from the right side of the lens module mounting bracket to the ground. Such a design realizes the detection of the road surface through two distance sensors, ensuring that the vehicle lamp is parallel to the road surface.

[0015] In an implementable embodiment, the first distance sensor and the second distance sensor form a certain angle, the first distance sensor is inclined forward to the left, and the second distance sensor is inclined forward to the right. A third distance sensor is provided at the center of the first distance sensor and the second distance sensor, and the third distance sensor is inclined forward. In complex road conditions, it can be judged whether the vehicle is in an uphill or downhill state according to the distance sensors. If all the sensor data is larger than the calibration distance, it can be determined that the vehicle is in a state of decreasing slope. It is necessary to lower the height of the vehicle lamp and adjust the angle according to the sizes of the left and right distance sensors. In addition, adding distance sensors can avoid misjudgment of the angle caused by partial occlusion of some distance sensors. The distance sensors can only be used as auxiliary angle correction tools, but they will fail in many special usage cases.

[0016] In one implementable embodiment, the lens module mounting bracket is provided with a hemispherical hole and a conical hole. There is a mounting plate behind the lens module mounting bracket, and the mounting plate is provided with a hemispherical groove and a cylindrical hole. When the mounting plate is mounted behind the lens module mounting bracket, the hemispherical hole and the hemispherical groove can be spliced to form a spherical cavity. The first distance sensor, the second distance sensor or the third distance sensor is provided with a spherical positioning portion and a cylindrical portion. The spherical positioning portion can be mounted in the spherical cavity, and the cylindrical portion passes through the conical hole. There is a positioning groove on the side of the conical hole, and a positioning piece is arranged in the positioning groove. The positioning piece is provided with a positioning hole, and the positioning hole matches the cylindrical portion so that the cylindrical portion can be mounted in the positioning hole. The positioning piece is locked by a locking member. Such a design facilitates calibrating the initial angle of the sensor, enabling a better headlight adjustment reference for headlights at different vehicle speeds and different distances.

[0017] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become easily understandable through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By referring to the accompanying drawings and reading the following detailed description, the above and other objects, features, and advantages of the exemplary embodiments of the present application will become easily understandable. In the drawings, several embodiments of the present application are shown in an exemplary rather than restrictive manner, where: In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0019] Figure 1 A three-dimensional schematic diagram of the cut-off line automatic calibration structure according to an embodiment of the present application is shown; Figure 1 ; Figure 2 A three-dimensional schematic diagram of the cut-off line automatic calibration structure according to an embodiment of the present application is shown; Figure 2 ; Figure 3 A schematic diagram of the relative position of the base and the lens module mounting bracket when the cut-off line automatic calibration structure according to an embodiment of the present application is in the initial position is shown; Figure 4 A schematic diagram of the relative position of the base and the lens module mounting bracket when the cut-off line automatic calibration structure according to an embodiment of the present application is in the second limit position is shown; Figure 5 Shows Figure 1 An enlarged schematic diagram at position B in Figure 6 A front view schematic diagram of the cut-off line automatic calibration structure according to an embodiment of the present application is shown; Figure 7 Shows Figure 6 An enlarged schematic diagram at position C in Figure 8 Shows Figure 6Schematic cross-sectional view at A-A in [the figure]; Figure 9 shows Figure 8 Enlarged schematic view at D in [the figure]; Figure 10 shows Figure 9 Schematic view of the position of the distance sensor after angle adjustment in [the figure]; Figure 11 Exploded schematic view showing the automatic cut-off line calibration structure; Figure 12 Schematic flowchart showing the automatic cut-off line calibration method according to an embodiment of the present application; Figure 13 Schematic control flowchart showing that the automatic cut-off line calibration method according to an embodiment of the present application maintains parallelism with the ground; Figure 14 Top view schematic of the distance trajectory line measured by the distance sensor of the automatic cut-off line calibration structure according to an embodiment of the present application; Figure 15 Side view schematic of the distance trajectory line measured by the distance sensor of the automatic cut-off line calibration structure according to an embodiment of the present application. Detailed implementation manners

[0020] To make the objectives, features, and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0021] As Figure 12 shown, an automatic cut-off line calibration method includes at least the following steps: After the vehicle lamp is installed, the vehicle lamp is rotated to the first extreme position along the first direction, and the first extreme position data is obtained, including at least angle data; the vehicle lamp is rotated to the second extreme position along the second direction, and the second extreme position data is obtained, including at least angle data; the average value is calculated based on the first extreme data and the second extreme data to obtain the horizontal calibration angle. At least part of the structure of the vehicle lamp in the embodiment of the present application can be rotated under the drive of a motor, such as the lens module or the whole vehicle lamp rotates.

[0022] Generally, vehicle headlights are driven by a motor. After the headlight is installed and the power-on module is activated, the relationship between the rotation direction of the motor and the installation direction of the encoder is determined first. When the motor rotates forward until it cannot rotate, wait for the motor torque to return to zero, and then record the positive angle on the encoder. When the motor rotates backward until it cannot rotate, wait for the motor torque to return to zero, and then record the negative angle on the encoder. According to the number of bits of the encoder and the range of code value changes, average the positive angle and the negative angle, and record the average value as the mechanical zero calibration, that is, the horizontal calibration angle when the cut-off line is in the horizontal position. After the calibration is completed, use the horizontal calibration angle as the initial value of the cut-off line of the headlight. After that, no matter how the vehicle rotates, the motor will always rotate in the opposite direction by the same angle to ensure that the cut-off line is always in the horizontal position. The rotation angle of the vehicle can be obtained by relying on a gyroscope, and the same technical effect can also be obtained by using other angle sensors.

[0023] As Figures 1-4 shown, an automatic cut-off line calibration structure is mainly used on the headlights of two-wheeled vehicles, including a base 2, a lens module mounting bracket 1, and a drive motor 3. The drive motor 3 drives the lens module mounting bracket 1 to rotate relative to the base 2. The base 2 is provided with a first limiting rib 21 and a second limiting rib 22, and the lens module mounting bracket 1 is provided with a first limiting end 11 and a second limiting end 12. When the lens module mounting bracket rotates in the first direction to the first extreme position, the first limiting end 11 abuts against the first limiting rib 21. When the lens module mounting bracket rotates in the second direction to the second extreme position, the second limiting end 12 abuts against the second limiting rib 22.

[0024] As Figure 3 shown, for the convenience of viewing the limiting structure, hide the redundant and irrelevant limiting components. At this time, in the initial position, the lens module mounting bracket 1 and the base 2 have the same symmetry plane. As Figure 4 shown, the second limiting end 12 abuts against the second limiting rib 22, and the lens module mounting bracket 1 is in the second extreme position.

[0025] As Figure 12 shown, in an implementable embodiment, an automatic cut-off line calibration method includes at least the following steps: After the headlight is installed, rotate the headlight in the first direction to the first extreme position, and obtain the first extreme position data. The first extreme position data includes at least distance data or angle data. Rotate the headlight in the second direction to the second extreme position, and obtain the second extreme position data. The first extreme position data includes at least distance data or angle data. Obtain the horizontal calibration angle and the horizontal calibration distance according to the first extreme data and the second extreme data. The horizontal calibration angle is the average of the angle at the first extreme position and the angle at the second extreme position, and the horizontal calibration distance is the distance data obtained when the headlight is at the horizontal calibration angle.

[0026] As Figure 13As shown, in an implementable embodiment, when the vehicle headlight is at the horizontal calibration angle position on a horizontal road surface, the headlight uses two distance sensors on the left and right to measure the distances from the left and right sides to the ground. When the two distance sensors on the left and right obtain the same distance on the horizontal road surface, this distance can be recognized as the horizontal calibration distance. If the two distance sensors on the left and right obtain different distances, it is necessary to check whether the horizontal calibration angle is accurate, that is, whether the cut-off line of the headlight is at the horizontal position when the headlight is at the horizontal calibration angle. If it is at the horizontal position, adjust the distance sensors so that the values of the left and right distance sensors are the same.

[0027] In an implementable embodiment, when the vehicle is running, if the distance data obtained by the left distance sensor is greater than the horizontal calibration distance and the distance data obtained by the right distance sensor is less than the horizontal calibration distance, the left side of the headlight turns downward, that is, the right side of the headlight turns upward, that is, it rotates counterclockwise; if the distance data obtained by the left distance sensor is less than the horizontal calibration distance and the distance data obtained by the right distance sensor is greater than the horizontal calibration distance, the left side of the headlight turns upward and the right side of the headlight turns downward, that is, it rotates clockwise. Under normal circumstances, when the distance becomes larger, it is necessary to turn downward. In special cases, the distance sensor may fail. To determine whether it fails, the real-time data of the distance sensor can be compared with the horizontal calibration distance. The horizontal calibration distance is the minimum distance, and the first limit position and the second limit position are the maximum distances. Usually, the data is considered normal within this range. Of course, the gyroscope and the headlight angle also need to be considered comprehensively. The inclination angle of a two-wheeled vehicle is much larger than that of a four-wheeled vehicle. For example, the inclination angle of a motorcycle on a race track is 60° - 65°, forming an angle of 25° - 30° with the ground. The friction inclination angle of an ordinary scooter can generally be about 40°. In this case, one of the distance sensors may fail. Therefore, first use the gyroscope to obtain the inclination angle of the vehicle, control the headlight to be close to the horizontal position, and then use the distance sensor to measure the distance. If the distances are different, it means that the road surface is uneven, and then make fine adjustments so that the cut-off line of the headlight is basically parallel to the road surface. In this way, when meeting on a road surface with a certain inclination angle on the inside and outside of the lane, it can be safer.

[0028] Such as Figure 14As shown in the figure, this figure shows the distance trajectory lines measured by the distance sensors in different situations from a top-down perspective. The solid lines represent the trajectory line 41 of the first left distance sensor, the trajectory line 51 of the second right distance sensor, and the measurement trajectory line 61 of the third distance sensor at the center position when the vehicle headlights are in the horizontal position. To increase the difference in the distances of the first left distance sensor and the second right distance sensor, the included angle between the first left distance sensor and the second right distance sensor can be increased. When the vehicle headlights are in the horizontal position, it can be seen that the lengths of the trajectory lines of the first left distance sensor and the second right distance sensor are the same; the double-dashed lines are the trajectory lines of the first left distance sensor and the second right distance sensor and the measurement trajectory line of the third distance sensor at the center position when the left side of the vehicle headlights is higher than the right side. It can be seen that the trajectory line of the first left distance sensor becomes significantly longer, the trajectory line of the second right distance sensor is slightly shortened, and the measurement trajectory line of the third distance sensor is slightly lengthened; the dashed lines are the trajectory lines of the first left distance sensor and the second right distance sensor and the measurement trajectory line of the third distance sensor at the center position when the left side of the vehicle headlights is lower than the right side. It can be seen that the trajectory line of the first left distance sensor is slightly shortened, the trajectory line of the second right distance sensor becomes significantly longer, and the measurement trajectory line of the third distance sensor is slightly lengthened.

[0029] As Figure 15 shown in the figure, this figure shows the changes in the distance trajectory lines measured by the distance sensors under different road surfaces from a side view. Suppose the height of the vehicle headlights is 1 meter, and a target point 10 meters directly ahead is measured. Assume that the included angle between the left and right distance sensors is 60°. The distance value obtained by detecting on a horizontal road surface is 11.55 meters. If the road surface slopes upward like the upper inclined dotted line 71 in the figure, the value will be less than 11.55 meters. If the road surface slopes downward like the lower arc dashed line 72 in the figure, the value will be higher than 11.55 meters. Therefore, the driving condition of the vehicle can be judged based on the distance, and the headlight angle can be adjusted. When the distance sensor values on both the left and right are lower than 11.55 meters, the height of the headlight cut-off line can be increased. When the distance sensor values on both the left and right are higher than 11.55 meters, the height of the headlight cut-off line can be decreased.

[0030] In an implementable embodiment, when the vehicle is driving, if the distance data obtained by the left distance sensor is greater than the distance data obtained by the right distance sensor, the left side of the vehicle headlights rotates downward, that is, the right side of the vehicle headlights rotates upward, until the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor; if the distance data obtained by the left distance sensor is less than the distance data obtained by the right distance sensor, the left side of the vehicle headlights rotates upward, that is, the right side of the vehicle headlights rotates downward, until the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor.

[0031] In an implementable embodiment, if the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor and greater than the horizontal calibration distance, the irradiation angle of the vehicle lamp is reduced until the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor and equal to the horizontal calibration distance; if the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor and less than the horizontal calibration distance, the irradiation angle of the vehicle lamp is increased until the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor and equal to the horizontal calibration distance.

[0032] As Figures 1-11 shown, a cut-off line automatic calibration structure is mainly used on the vehicle lamp of a two-wheeled vehicle, and includes a base 2, a lens module mounting bracket 1, a drive motor 3, a first distance sensor 4, and a second distance sensor 5. The drive motor 3 drives the lens module mounting bracket 1 to rotate relative to the base 2. The lens module mounting bracket 1 is provided with the first distance sensor 4 and the second distance sensor 5. The first distance sensor 4 and the second distance sensor 5 are symmetrically arranged on the left and right sides of the center of the lens module mounting bracket 1. The first distance sensor 4 can measure the distance between the left side of the lens module mounting bracket 1 and the ground, and the second distance sensor 5 can measure the distance from the right side of the lens module mounting bracket 1 to the ground. The lens module mounting bracket 1 at least mounts a lens module. The LED lamp beads can be fixed on the base 2 or can rotate with the lens module mounting bracket 1. In an implementable embodiment, the first distance sensor 4 and the second distance sensor 5 form a certain angle, the first distance sensor 4 is inclined forward to the left, and the second distance sensor 5 is inclined forward to the right. A third distance sensor is provided at the center of the first distance sensor 4 and the second distance sensor 5, and the third distance sensor is inclined directly forward. The included angles between the first distance sensor 4 and the second distance sensor 5 and the horizontal plane are between 10° and 50°, the included angle between the first distance sensor 4 and the second distance sensor 5 is between 5° and 60°, and the smaller the included angle is set as the irradiation distance of the vehicle lamp is farther.

[0033] In an implementable embodiment, the lens module mount 1 is provided with a hemispherical hole 13 and a tapered hole 14. Behind the lens module mount 1, there is a mounting plate 15. The mounting plate 15 is provided with a hemispherical groove 16 and a cylindrical hole 17. When the mounting plate 15 is mounted behind the lens module mount 1, the hemispherical hole 13 and the hemispherical groove 16 can be spliced to form a spherical cavity 18. The first distance sensor 4, the second distance sensor 5 or the third distance sensor 6 is provided with a spherical positioning portion 7 and a columnar portion 8. The spherical positioning portion 7 can be mounted into the spherical cavity 18, and the columnar portion 8 passes through the tapered hole 14. A positioning groove 19 is provided on the side of the tapered hole 14, and a positioning piece 9 is provided in the positioning groove 19. The positioning piece 9 is provided with a positioning hole 10, and the positioning hole 10 matches the columnar portion 8 so that the columnar portion 8 can be mounted in the positioning hole 10. The positioning piece 9 is locked by a locking member 20. The positioning piece 9 is made of a metal material with a small thickness and high strength. The locking member 20 can be a locking screw. At least two positioning pieces 9 are provided. The first distance sensor 4 and the second distance sensor 5 can share one positioning piece 9, the first distance sensor 4 and the second distance sensor 5 can each use one positioning piece 9, and the third distance sensor 6 uses a positioning piece 9 alone. The positioning piece 9 can be provided with a Y-shaped structure or a T-shaped structure of a paddle to facilitate controlling the position of the positioning piece 9. Two positioning pieces 9 can be stacked in the positioning groove 19, and the same locking screw can be used for locking. To ensure force balance, two locking screws can be provided.

[0034] As Figure 9 and Figure 10 shown, the first distance sensor 4 and the second distance sensor 5 have the same design as the third distance sensor 6. The third distance sensor 6 is mounted in the spherical cavity 18 and can rotate and move at an angle. After the positioning piece 9 is locked, the third distance sensor 6 is also locked at a specific angle. The specific angle can be determined according to the headlight irradiation distance. The lidar and millimeter-wave radar have a relatively long detection distance and can monitor the road conditions farther away, but the price is also relatively high. The ultrasonic sensor and the infrared sensor have a relatively short detection distance, but the price is relatively low. Different configurations can be selected according to different vehicle models. Of course, if cost is not considered, more than 3 distance sensors can be provided to detect the distances at different near and far positions.

[0035] It should be understood that the various forms of the processes shown above can be used, and steps can be reordered, added or deleted. For example, the steps recited in this application can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this application can be achieved, and no limitation is made herein.

[0036] Furthermore, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, "a plurality of" means two or more unless specifically defined otherwise.

[0037] As described above, the above are only specific embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims described.

Claims

1. An automatic cut-off line calibration method, characterized in that: At least include the following steps, After the vehicle lamp is installed, the vehicle lamp is rotated to the first limit position along the first direction, and the first limit position data is obtained, which at least includes angle data; The vehicle lamp is rotated to the second limit position along the second direction, and the second limit position data is obtained, which at least includes angle data; Calculate the average value according to the first limit data and the second limit data to obtain the horizontal calibration angle.

2. An automatic cut-off line calibration method, characterized in that: At least include the following steps, After the vehicle lamp is installed, the vehicle lamp is rotated to the first limit position along the first direction, and the first limit position data is obtained. The first limit position data at least includes distance data or angle data; The vehicle lamp is rotated to the second limit position along the second direction, and the second limit position data is obtained. The first limit position data at least includes distance data or angle data; Obtain the horizontal calibration angle and the horizontal calibration distance according to the first limit data and the second limit data; The horizontal calibration angle is the average value of the angle at the first limit position and the angle at the second limit position, and the horizontal calibration distance is the distance data obtained when the vehicle lamp is at the horizontal calibration angle.

3. The automatic cut-off line calibration method according to claim 2, characterized in that: The vehicle lamp uses two distance sensors on the left and right to measure the distances between the left and right sides and the ground. When the two distance sensors on the left and right obtain the same distance on a horizontal road surface, this distance can be recognized as the horizontal calibration distance.

4. The automatic calibration method for the cut-off line according to claim 2, characterized in that: When the vehicle is driving, if the distance data obtained by the left distance sensor is greater than the horizontal calibration distance and the distance data obtained by the right distance sensor is less than the horizontal calibration distance, then the left side of the vehicle lamp rotates downward, that is, the right side of the vehicle lamp rotates upward; if the distance data obtained by the left distance sensor is less than the horizontal calibration distance and the distance data obtained by the right distance sensor is greater than the horizontal calibration distance, then the left side of the vehicle lamp rotates upward, that is, the right side of the vehicle lamp rotates downward.

5. The automatic cut-off line calibration method according to claim 2, characterized in that: When the vehicle is driving, if the distance data obtained by the left distance sensor is greater than the distance data obtained by the right distance sensor, then the left side of the vehicle lamp rotates downward, that is, the right side of the vehicle lamp rotates upward, until the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor; if the distance data obtained by the left distance sensor is less than the distance data obtained by the right distance sensor, then the left side of the vehicle lamp rotates upward, that is, the right side of the vehicle lamp rotates downward, until the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor.

6. The automatic calibration method of the cut-off line according to any one of claims 2-5, characterized in that: If the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor and is greater than the horizontal calibration distance, then reduce the irradiation angle of the vehicle lamp until the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor and is equal to the horizontal calibration distance; if the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor and is less than the horizontal calibration distance, then increase the irradiation angle of the vehicle lamp until the distance data obtained by the left distance sensor is the same as the distance data obtained by the right distance sensor and is equal to the horizontal calibration distance.

7. An automatic cut-off line calibration structure, characterized in that: It includes a base (2), a lens module mounting bracket (1), and a driving motor (3). The driving motor (3) drives the lens module mounting bracket (1) to rotate relative to the base (2). The base (2) is provided with a first limiting rib (21) and a second limiting rib (22). The lens module mounting bracket (1) is provided with a first limiting end (11) and a second limiting end (12). When the lens module mounting bracket (1) rotates to the first extreme position along the first direction, the first limiting end (11) abuts against the first limiting rib (21). When the lens module mounting bracket (1) rotates to the second extreme position along the second direction, the second limiting end (12) abuts against the second limiting rib (22).

8. An automatic cut-off line calibration structure, characterized in that: It includes a base (2), a lens module mounting bracket (1), a driving motor (3), a first distance sensor (4), and a second distance sensor (5). The driving motor (3) drives the lens module mounting bracket (1) to rotate relative to the base (2). The lens module mounting bracket (1) is provided with a first distance sensor (4) and a second distance sensor (5). The first distance sensor (4) and the second distance sensor (5) are symmetrically arranged on the left and right sides of the center of the lens module mounting bracket (1). The first distance sensor (4) can measure the distance between the left side of the lens module mounting bracket (1) and the ground. The second distance sensor (5) can measure the distance between the right side of the lens module mounting bracket (1) and the ground.

9. The automatic cut-off line calibration structure according to claim 8, wherein: The first distance sensor (4) and the second distance sensor (5) form a certain angle, the first distance sensor (4) inclines left - frontward, and the second distance sensor (5) inclines right - frontward. A third distance sensor (6) is provided at the center of the first distance sensor (4) and the second distance sensor (5), and the third distance sensor (6) inclines straight forward.

10. The automatic cut-off line calibration structure according to claim 9, characterized in that: The lens module mounting bracket (1) is provided with a hemispherical hole (13) and a tapered hole (14). A mounting plate (15) is provided behind the lens module mounting bracket (1). The mounting plate (15) is provided with a hemispherical groove (16) and a cylindrical hole (17). When the mounting plate (15) is mounted behind the lens module mounting bracket (1), the hemispherical hole (13) and the hemispherical groove (16) can be spliced to form a spherical cavity (18). The first distance sensor (4), the second distance sensor (5), or the third distance sensor (6) is provided with a spherical positioning portion (7) and a columnar portion (8). The spherical positioning portion (7) can be mounted into the spherical cavity (18). The columnar portion (8) passes through the tapered hole (14). A positioning groove (19) is provided on the side of the tapered hole (14). A positioning piece (9) is provided in the positioning groove (19). The positioning piece (9) is provided with a positioning hole (10). The positioning hole (10) matches the columnar portion (8) so that the columnar portion (8) can be mounted in the positioning hole (10). The positioning piece (9) is locked by a locking member (20).

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