A road marking system for enhancing radar perception

Abstract

The utility model discloses a road marking for enhancing radar perception, comprising a marking reflective layer, a colorless transparent adhesive layer and a primer layer, wherein the primer layer is coated on the road surface, the colorless transparent adhesive layer is coated on the primer layer, the marking reflective layer is coated on the colorless transparent adhesive layer, the marking reflective layer comprises a coating layer and an octagonal corner reflector, the coating layer is coated on the colorless transparent adhesive layer, and the octagonal corner reflector is evenly distributed and embedded in the coating layer at different angles. The marking of the utility model is embedded with an octagonal corner reflector made of aluminum foil material, which can not only reflect radar electromagnetic waves, making the marking easier to be perceived by the radar of the autonomous driving vehicle, but also reflect light to attract the driver's attention to the marking.

Description

Technical Field

[0001] The utility model belongs to the technical field of road markings, and in particular relates to a road marking for enhancing radar perception. Background Art

[0002] During the driving process of autonomous vehicles, accurate identification of the external environment, especially clear and accurate identification of road infrastructure such as road markings, is the key to ensuring driving safety. At present, autonomous vehicles mainly use laser radar and millimeter wave radar to perceive road markings. These two technologies have their own unique mechanisms, advantages, defects and shortcomings. Laser radar mainly perceives the surrounding environment by emitting pulsed lasers and receiving the signals reflected back. These laser beams can scan the markings on the road surface and construct an accurate three-dimensional model of the surrounding environment by analyzing the intensity and time difference of the reflected signals. In terms of marking detection, laser radar can distinguish markings of different colors and types, and accurately determine their position and shape, but it is greatly affected by bad weather. Millimeter wave radar detects the distance, speed and angle of the target object by emitting millimeter waves and receiving the signals reflected back. In autonomous driving, millimeter wave radar is usually used for vehicle distance and speed measurement, and can also assist in detecting road markings, but millimeter wave radar is insufficient in detecting small objects and is also affected by climate.

[0003] The current road markings are mainly composed of materials such as paint, glass beads and adhesives. These markings have the characteristics of poor wear resistance, insufficient color, limited reflective ability, and poor adaptability to special weather conditions. In special weather conditions such as rain, haze, etc., the visibility of the markings will be greatly reduced due to rain erosion, fog obstruction and other reasons, which may make it difficult for drivers to observe and cause traffic accidents.

[0004] During the driving process, the vehicle may drive on the markings without paying attention to them, which will cause friction and crushing on the markings, resulting in a reduction in the life of the markings. If the markings are incomplete or damaged, it will also cause difficulties in vehicle identification during the driving process of the autonomous vehicle. At the same time, especially in special weather such as rain, snow, fog and haze, the low visibility will make the markings unclear and the vehicle will drive on the markings. Therefore, some technical means are needed to improve this situation. While improving the visibility of the markings in foggy days, it also has a certain durability. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of the utility model is to provide a road marking that enhances radar perception.

[0006] In order to solve the above problems, the utility model adopts the following technical solutions:

[0007] A road marking for enhancing radar perception comprises a marking reflective layer, a colorless transparent adhesive layer and a primer layer, wherein the primer layer is coated on the road surface, the colorless transparent adhesive layer is coated on the primer layer, the marking reflective layer is coated on the colorless transparent adhesive layer, the marking reflective layer comprises a coating layer and an octagonal corner reflector, the octagonal corner reflector is composed of eight corner reflectors perpendicular to each other, the octagonal corner reflector is made of aluminum foil material, the coating layer is coated on the colorless transparent adhesive layer, and the octagonal corner reflectors are evenly distributed at different angles and embedded in the coating layer.

[0008] Preferably, the aluminum foil is a smooth aluminum foil treated with a highly transparent polyester layer.

[0009] Preferably, the color of the aluminum foil is red.

[0010] Preferably, the paint layer is a two-component road marking paint to which active acrylic resin and anti-UV agent are added.

[0011] Preferably, the maximum diameter of the octagonal corner reflector is smaller than the thickness of the coating layer.

[0012] Preferably, the maximum diameter of the octagonal corner reflector is 1 / 2 of the thickness of the coating layer.

[0013] Beneficial effects of the utility model:

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] The utility model embeds an octagonal corner reflector made of aluminum foil material in the marking line, which can not only reflect radar electromagnetic waves, making the marking line easier to be perceived by the radar of the autonomous driving vehicle, but also reflect light to attract the driver's attention to the marking line. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 Schematic diagram of the reflection principle of the corner reflector;

[0018] Figure 3 Identify schematic diagrams for autonomous vehicles;

[0019] Figure 4 Schematic diagram of the structure of an octagonal corner reflector. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1-4 As shown, the utility model provides a technical solution: a road marking for enhancing radar perception, comprising a marking reflective layer 1, a colorless transparent adhesive layer 2 and a primer layer 3, wherein the primer layer 3 is coated on the road surface, the colorless transparent adhesive layer 2 is coated on the primer layer 3, the marking reflective layer 1 is coated on the colorless transparent adhesive layer 2, the marking reflective layer 1 comprises a coating layer 11 and an octagonal corner reflector 12, the octagonal corner reflector 12 is composed of eight corner reflectors perpendicular to each other, the octagonal corner reflector 12 is made of aluminum foil material, the coating layer 11 is coated on the colorless transparent adhesive layer 2, and the octagonal corner reflectors 12 are evenly distributed at different angles and embedded in the coating layer 11.

[0022] When used specifically, Figure 3 As shown in the figure, when the laser radar or millimeter-wave radar around or on the roof of the autonomous driving vehicle emits pulsed laser or millimeter-wave to sense the road markings, the aluminum foil in the markings has stronger electromagnetic reflectivity and light reflectivity, and the aluminum foil is made into a shape consisting of eight corner reflectors. Since the corner reflector is composed of three mutually perpendicular surfaces, that is, three pairs of mirrors, light directed to the corner reflector from any direction will be reflected back by it in the original direction, thereby enhancing the reflection of light. When the vehicle's lights or lasers shine on it: on the one hand, due to the reflection of the vehicle's lights, it will look dazzling and attract the driver's attention; on the other hand, the laser shining on the corner reflector will also be The three pairs of mirrors reflect back multiple laser beams to help identify autonomous driving vehicles; at the same time, aluminum foil also has better electromagnetic reflectivity; in addition, when the radar electromagnetic wave scans the corner reflection, the electromagnetic wave will be refracted and amplified on the metal corner, generating a strong echo signal, and a strong echo target will appear on the radar screen; and the octagonal corner reflector 12 is composed of eight corner reflectors that are perpendicular to each other. On the one hand, such a structure can ensure that the facing surface of the corner reflector can cover 360°, so that light in all directions can be returned in the opposite direction of the original path. On the other hand, it has better stability, which can minimize damage during processing, construction and use.

[0023] The principle of corner reflector is as follows Figure 2As shown, first assume that only mirrors a and b are working, and only velocities v1 and v2 are working. In this case, the light is incident on surface b along AB at a speed of v, and is reflected along the BM direction. Similarly, the second point is reflected on surface a, and after two reflections, it changes to the opposite direction, indicating that the light leaves in a direction parallel to the original light path. When velocity v3 also works, the direction of the photon also changes to the opposite direction after being reflected by two surfaces at points M and G. It can be seen that the three reflections (B, M, G) of the photon cause the direction of the component velocity vector of the photon to be reversed, so the direction of the combined velocity of the photon after reflection is opposite to the original direction of motion. This shows that no matter from which direction the incident light is incident, after being reflected by each plane mirror in the corner reflector, it will be reflected back in the opposite direction to the original direction.

[0024] The marking line of the utility model is embedded with an octagonal corner reflector 12 made of aluminum foil material, which can not only reflect radar electromagnetic waves, making the marking line easier to be perceived by the radar of the autonomous driving vehicle, but also reflect light to attract the driver's attention to the marking line.

[0025] Furthermore, the aluminum foil is a smooth aluminum foil treated with a highly transparent polyester layer. The highly transparent polyester layer treatment of the aluminum foil can improve the reflectivity of the aluminum foil. At the same time, the polyester layer has strong acid resistance, can prevent oxidation and corrosion, and maintain the surface brightness for a long time. Such treatment not only improves the reflectivity of the aluminum foil, but also enhances its durability.

[0026] Furthermore, the color of the aluminum foil is red. When the light from a vehicle shines on the aluminum foil, the red light will have stronger penetrating power under special weather conditions with low visibility such as rain, snow, fog and haze, which is conducive to the driver's attention to the markings.

[0027] Furthermore, the paint layer 11 adopts a two-component road marking paint to which an active acrylic resin and an anti-UV agent are added. The active acrylic resin can prepare a two-component road marking paint with low viscosity and strong adhesion to aluminum foil. The anti-UV agent can effectively improve the durability of the two-component road marking paint. This two-component paint has excellent adhesion, good wear resistance and corrosion resistance, and more importantly, excellent retroreflectivity and good reflective effect.

[0028] Furthermore, the maximum diameter of the octagonal corner reflector 12 is smaller than the thickness of the paint layer 11, so that the octagonal corner reflector 12 can be completely embedded in the paint layer 11, thereby preventing the octagonal corner reflector 12 from protruding from the surface of the paint layer 11 and causing damage to the vehicle.

[0029] Specifically, the maximum diameter of the octagonal corner reflector 12 is 1 / 2 of the thickness of the coating layer 11 .

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A road marking with enhanced radar perception, characterized in that: The invention comprises a road marking reflective layer (1), a colorless transparent adhesive layer (2) and a base coating layer (3), wherein the base coating layer (3) is coated on a road surface, the colorless transparent adhesive layer (2) is coated on the base coating layer (3), the road marking reflective layer (1) is coated on the colorless transparent adhesive layer (2), the road marking reflective layer (1) comprises a coating layer (11) and an octagonal corner reflector (12), the octagonal corner reflector (12) is composed of eight corner reflectors perpendicular to each other, the octagonal corner reflector (12) is made of aluminum foil material, the coating layer (11) is coated on the colorless transparent adhesive layer (2), and the octagonal corner reflectors (12) are evenly distributed at different angles and embedded in the coating layer (11).

2. The road marking with enhanced radar perception according to claim 1, characterized in that The aluminum foil is a smooth aluminum foil treated with a highly transparent polyester layer.

3. The road marking with enhanced radar perception according to claim 1, characterized in that: The color of the aluminum foil is red.

4. The road marking with enhanced radar perception according to claim 1, characterized in that: The maximum diameter of the octagonal corner reflector (12) is smaller than the thickness of the coating layer (11).

5. The road marking with enhanced radar perception according to claim 4, characterized in that: The maximum diameter of the octagonal corner reflector (12) is 1 / 2 of the thickness of the coating layer (11).

Images