Radar light-transmitting temperature box for testing intelligent networked automobile
By introducing translucent glass and heating systems into the lidar test box, the problem of inability to monitor point cloud performance in the existing technology is solved, and high-precision testing under different temperature and humidity conditions is achieved, ensuring the reliability of lidar Test.
Patent Information
- Application Number
- CN202411675403.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2024-12-27
AI Technical Summary
The existing lidar temperature and humidity test chamber lacks test equipment to monitor point cloud performance during temperature experiments, and cannot effectively detect the performance of lidar under different temperature and humidity conditions.
A radar translucent temperature box for intelligent connected vehicle testing is designed, using translucent glass, air guide channel, heating module and heating wire, and the heating module and heating wire are controlled to work when the temperature changes through the joint control module. Reduce fogging and frost from translucent glass and improve testing accuracy.
It realizes the point cloud performance of lidar in a temperature and humidity test environment, improves the accuracy and reliability of radar testing, and ensures effective performance detection of lidar under different temperature and humidity conditions.
Smart Images
Figure CN119199808A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of laser radar testing equipment, and in particular to a radar light-transmitting temperature chamber for testing intelligent networked vehicles. Background Art
[0002] With the development of intelligent connected vehicle technology, the intelligent and connected functions of automobiles are gradually being commercialized, and autonomous vehicles are in a critical period of moving from L2+ to L3 and above, which will inevitably be accompanied by the coordinated development of autonomous vehicle environmental perception systems, decision-making systems, and execution systems. As one of the high-precision components for environmental perception of intelligent connected vehicles, LiDAR detects the surrounding environment of the vehicle and processes information through the reflection of laser signals. Its accuracy and reliability directly affect the driving safety and driving experience of autonomous vehicles. How to objectively evaluate the reliability of LiDAR has always been a difficult problem in the field of environmental perception and information processing of intelligent connected vehicles.
[0003] The LiDAR temperature and humidity test chamber is a device used to test the performance of LiDAR under different temperature and humidity conditions. The LiDAR temperature and humidity test chamber can simulate different climatic environmental conditions, including high and low temperature operation and storage, temperature cycle, high temperature and high humidity, low temperature and low humidity, and condensation test. The temperature range is usually from -40℃ to +150℃, and the humidity range is from 20% to 98%RH. The test equipment is suitable for adaptability tests of electrical and electronic products, components, parts and their materials in high and low temperature environments.
[0004] Existing lidar temperature and humidity test chambers usually adopt a fully sealed solution and lack test equipment to monitor point cloud performance during temperature experiments. Summary of the invention
[0005] To achieve the above-mentioned purpose and other related purposes, the present invention discloses a radar light-transmitting temperature box for testing intelligent connected vehicles, including: a test box, a light-transmitting window is opened on the side of the test box, and light-transmitting glass is arranged at the light-transmitting window.
[0006] Furthermore, a mounting fixture for fixing the light-transmitting glass to a test box is provided at the connection between the light-transmitting glass and the light-transmitting window, the mounting fixture comprises a front fixture and a rear fixture, the rear fixture is detachably connected to the test box, the rear fixture is provided with a window matching the size of the light-transmitting glass, the light-transmitting glass is installed in the window, bosses matching the size of the light-transmitting window are fixedly provided around the window, the bosses are clamped with the light-transmitting window, the front fixture cover is provided on the rear fixture and is connected to the rear fixture by bolts, and the front fixture is connected to the test box by fasteners.
[0007] Furthermore, heating wires are arranged around the light-transmitting glass.
[0008] Furthermore, the test box is provided with a heating component, which includes an air guide channel and a heating module. The heating module is arranged on the test box, the air guide channel is hollow, one end of the air guide channel is fixedly connected to the air outlet of the heating module, and the other end of the air guide channel points to the light-transmitting glass.
[0009] Furthermore, the air guide channel adopts a Laval nozzle design.
[0010] Furthermore, the air outlet direction of the air guide channel is parallel to the surface of the light-transmitting glass, and the air outlet of the air guide channel is located at the edge of one side of the light-transmitting glass. A wind collecting plate for blocking the hot air from the air guide channel is fixedly arranged on the surface of the test box. The wind collecting plate is arranged around the light-transmitting glass, and the opening of the wind collecting plate is opposite to the air outlet of the air guide channel.
[0011] Furthermore, the cross-section of the wind collecting plate is arc-shaped.
[0012] Furthermore, a radar isolation cover is arranged in the test box, and the radar isolation cover includes a supporting frame and a shielding surface, and the shielding surface is arranged outside the supporting frame, and the shielding surface is used to change the echo direction of the radar wave, consume the energy of the radar wave and weaken the reflection of the radio wave.
[0013] Furthermore, the inner wall of the front window of the inner box of the test box and the left and right sides are covered with low-reflective material.
[0014] Furthermore, the test box is provided with a temperature sensor and a joint adjustment and control module, and the joint adjustment and control module controls the heating module and the heating wire according to the temperature, including: The temperature sensor feeds back the temperature inside the box and the temperature of the glass; When doing low temperature experiments, the heating module does not start when the room temperature is 20℃-0℃, and the heating wire power is the first power value; When the temperature drops from 0℃ to -40℃, the heating module is controlled to increase linearly from 0w to the second power value, and the heating wire around the glass increases to the third power value; During the high temperature and high humidity experiment, when the temperature sensor detects that the glass temperature is 10°C different from the ambient temperature, the heating module is controlled to increase linearly from 0w to the fourth power value, and the heating wire power is increased to the fifth power value.
[0015] By adopting the above technical solution, light-transmitting glass is arranged on the test box, so that when the laser radar is tested in the test box, the detection signal can be transmitted to the outside through the light-transmitting glass, and the test performance of the laser radar can be detected in the temperature and humidity test environment, so that the point cloud performance can be monitored during the temperature and humidity experiment; by setting the air guide channel, heating module and heating wire, and controlling it by the joint adjustment and control module, when the light-transmitting glass is fogged and frosted, the heating module and the heating wire work, reducing the possibility of fogging of the light-transmitting glass, thereby reducing the impact on the light transmittance of the light-transmitting glass and improving the accuracy of the radar test. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. The accompanying drawings are used to better understand the present solution and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, among which:
[0017] Figure 1 The overall schematic diagram of the test box; Figure 2 An exploded view showing the connection relationship of the mounting fixture; Figure 3 It is an exploded view from another angle used to illustrate the connection relationship of the mounting fixture.
[0018] Figure numerals: 1. test box; 2. mounting fixture; 21. front fixture; 22. rear fixture; 3. air guide channel; 4. sealing strip; 5. heating wire; 6. light-transmitting glass; 61. anti-reflection film; 62. quartz glass; 7. air collecting plate; 8. boss. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.
[0020] Reference Figure 1 An embodiment of the present invention provides a radar light-transmitting temperature chamber for testing an intelligent connected vehicle, comprising a test chamber 1, a light-transmitting window is provided on a side of the test chamber 1, and a light-transmitting glass 6 is provided at the light-transmitting window.
[0021] The above-mentioned test box 1 is a laser radar temperature and humidity test box 1 known to technical personnel in this field, and is internally provided with a heating system, a humidification system, a refrigeration system, a dehumidification system and an air circulation system. When the laser radar is subjected to a temperature and humidity test, the staff adjusts the heating system, the refrigeration system, the humidification system and the dehumidification system accordingly, so that the temperature and humidity environment in the test box 1 changes according to the test requirements, thereby meeting the needs of testing the laser radar in a variety of different temperature and humidity environments.
[0022] Specifically, refer to Figure 2 and Figure 3The above-mentioned light-transmitting glass 6 includes two layers of quartz glass 62 and three layers of anti-reflection film 61. The anti-reflection film 61 and the quartz glass 62 are arranged alternately. The glass is a silicon dioxide structure, high purity, and high-temperature melting. The high light transmittance of the quartz glass 62 mainly comes from its unique structure and manufacturing process. Quartz glass 62 is a glass composed of a single component of silicon dioxide (SiO2), which is usually divided into two categories: transparent quartz glass 62 and opaque quartz glass 62 (fused quartz). Transparent quartz glass 62 is made of crystal or silicon tetrachloride as raw materials and melted at high temperature. The SiO2 content is above 99.95%, and the SiO2 content of high-purity quartz glass 62 can reach above 99.999%. This high purity ensures that the quartz glass 62 has extremely high optical uniformity and transparency. Quartz glass 62 is composed of a network skeleton composed of pure SiO4 tetrahedrons, with strong silicon-oxygen bonds and a compact structure, which makes it have very high mechanical strength and heat resistance, small thermal expansion coefficient, and good chemical stability. This structural characteristic enables the quartz glass 62 to maintain high light transmittance in a high temperature environment. Without the anti-reflection film 61, the visible light transmittance of the quartz glass 62 is generally above 85%, and the transmittance can be increased to above 92% after adding the anti-reflection film 61. The light transmittance of the quartz glass 62 in the infrared region is also very excellent.
[0023] In terms of the material selection of the three-layer anti-reflection film 61, common materials include silicon dioxide (SiO2), magnesium fluoride (MgF2), etc. The refractive index of these materials can be controlled by adjusting the thickness of the deposited film. By adjusting the thickness and refractive index of the film layer, it is possible to achieve anti-reflection of light of a specific wavelength, reduce reflection and increase transmission. The superposition of the three-layer anti-reflection film 61 ensures that the transmittance in the 905nm-1550nm band is higher than 90%, which can meet the high temperature environment above 100°C.
[0024] As mentioned above, by arranging the light-transmitting glass 6 on the test box 1, when the laser radar is tested in the test box 1, the detection signal can be transmitted to the outside through the light-transmitting glass 6, and the test performance of the laser radar can be detected in the temperature and humidity test environment, thereby monitoring the point cloud performance during the temperature and humidity experiment.
[0025] Reference Figure 2 and Figure 3A mounting fixture 2 for fixing the light-transmitting glass 6 to the test box 1 is provided at the connection between the light-transmitting glass 6 and the light-transmitting window. The mounting fixture 2 includes a front fixture 21 and a rear fixture 22. The rear fixture 22 is detachably connected to the test box 1. The rear fixture 22 is provided with a window matching the size of the light-transmitting glass 6. The light-transmitting glass 6 is installed in the window. A boss 8 matching the size of the light-transmitting window is fixedly provided around the window. The boss 8 is snap-fitted with the light-transmitting window. The front fixture 21 is covered on the rear fixture 22 and connected to the rear fixture 22 by bolts. The front fixture 21 is connected to the test box 1 by a fast wire. A sealing strip 4 is provided between the front fixture 21 and the rear fixture 22. The sealing strip 4 reduces the possibility of air leakage and water leakage. The mounting fixture 2 is easy to disassemble. When the light-transmitting glass 6 needs to be replaced, the mounting fixture 2 is removed from the test box 1, and then the front fixture 21 and the rear fixture 22 are separated, and then the light-transmitting glass 6 is replaced, thereby improving the efficiency of disassembling and replacing the light-transmitting glass 6.
[0026] Reference Figure 2 and Figure 3 The test box 1 is provided with a heating component, the heating component includes an air guide channel 3 and a heating module, the heating module is arranged on the test box 1, the air guide channel 3 is hollow, one end of the air guide channel 3 is fixedly connected to the air outlet of the heating module, and the other end of the air guide channel 3 points to the light-transmitting glass 6. The air guide channel 3 adopts a Laval nozzle design, and the air outlet direction of the air guide channel 3 is parallel to the surface of the light-transmitting glass 6. The air outlet of the air guide channel 3 is located at one side edge of the light-transmitting glass 6. The front clamp 21 is fixedly provided with an air gathering plate 7 for blocking the hot air of the air guide channel 3. The air gathering plate 7 is arranged around the light-transmitting glass 6, and the opening of the air gathering plate 7 is directly opposite to the air outlet of the air guide channel 3. The cross-section of the air gathering plate 7 is an arc-shaped setting.
[0027] In the process of high temperature to low temperature / low temperature to high temperature, the light-transmitting glass 6 will be fogged or frosted due to the rapid change of temperature, which seriously affects the light transmittance of the glass and thus affects the accuracy of the experiment. At this time, the heating module is turned on, and hot air is sent out from the channel opening of the air guide channel 3, and the heat is transferred to the outer surface of the glass through the macroscopic movement of the surrounding gas by thermal convection. When the gas is heated, its density changes, causing the gas to flow, thereby bringing heat from the air to the outer surface of the glass, and then through the heat conduction method, the heat is transferred from the high-temperature part of the outer surface of the glass to the low-temperature part of the inner layer of the glass through the collision of microscopic particles (such as electrons, atoms and molecules) inside the glass to achieve heating.
[0028] Inspired by the Laval nozzle principle, when gas flows in a pipe, the flow rate is related to the cross-sectional area of the pipe. The flow rate is high where the cross-section is small, and low where the cross-section is large. The design of the Laval nozzle air duct allows the airflow to gradually contract in the front half of the nozzle, and then gradually expand after reaching a narrow throat. This design allows the airflow to continuously accelerate as it passes through the nozzle, thereby generating a huge thrust that ultimately reaches the farthest end of the glass, solving the problem of fogging at the farthest end of the glass.
[0029] Since the hot air is accelerated from the air duct and then ejected in a fan-shaped divergent manner, the air collecting plate 7 is set to be arc-shaped, and the gas forms a vortex in the air collecting hood, which greatly increases the residence time of the hot air on the glass surface and significantly improves the heating efficiency.
[0030] The inner layers of the air guide channel 3 and the air collecting plate 7 are installed with heat insulation cotton to prevent scalding accidents. The heat insulation cotton can also better buffer the airflow and increase the residence time of the airflow on the glass surface, thereby improving the defog and defrost effects.
[0031] A heating wire 5 is also arranged in the mounting fixture 2. The heating wire 5 is arranged around the light-transmitting glass 6 and is used for auxiliary heating of the light-transmitting glass 6, thereby further improving the defogger and defroster effect.
[0032] The test box 1 is provided with a radar isolation cover, which includes a supporting frame and a shielding surface. The shielding surface is sleeved outside the supporting frame and is used to change the echo direction of the radar wave, consume the energy of the radar wave and weaken the reflection of the radio wave.
[0033] The radar isolation cover is composed of a supporting frame and a shielding surface. The shielding surface is usually made of sprayed metal mesh or microwave absorbing materials. These materials can change the echo direction of radar waves or consume the energy of radar waves, weaken the reflection of radio waves, and prevent the inner wall of the box and multiple radar laser reflections from affecting the accuracy of experimental data. The radar isolation cover is equipped with heat dissipation holes, which ensure the uniformity of the temperature and humidity environment around the radar and avoid overheating of the radar surface.
[0034] The inner wall of the front window of the inner box of the test box 1 and the left and right sides are covered with low-reflective materials. The low-reflective materials are coated with one or more layers of thin films on the surface of the material, and the interference effect of different optical materials on light is used to reduce reflection. The light is reflected twice on the anti-reflection layer, which interferes with the original reflected light, thereby eliminating the reflected light and enhancing the incident light. The inner wall of the front window of the inner box and the left and right sides are covered with low-reflective materials, and the reflectivity in the 905nm-1550nm band is not higher than 10%.
[0035] The test box 1 is provided with a temperature sensor and a joint adjustment and control module, and the joint adjustment and control module controls the heating module and the heating wire 5 according to the temperature, including: The temperature sensor feeds back the temperature inside the box and the temperature of the glass; When doing low temperature experiments, the heating module is not started when the room temperature is 20℃-0℃, and the power of the heating wire 5 is the first power value; When the temperature drops from 0°C to -40°C, the heating module is controlled to increase linearly from 0w to the second power value, and the heating wire 5 is increased to the third power value; During the high temperature and high humidity experiment, when the temperature sensor detects that the glass temperature differs from the ambient temperature by 10°C, the heating module is controlled to increase linearly from 0W to the fourth power value, and the power of the heating wire 5 is increased to the fifth power value.
[0036] Preferably, in the embodiment of the present invention, the first power value is set to 100W, the second power value is set to 2000W, the third power value is set to 200W, the fourth power value is set to 3300W, and the fifth power value is set to 300W.
[0037] The control logic of the joint debugging and control module can also be set by technicians in this field, which will not be described here.
[0038] This embodiment provides a radar light-transmitting temperature box for testing intelligent networked vehicles. A light-transmitting glass 6 is arranged on the test box 1, so that when the laser radar is tested in the test box 1, the detection signal can be transmitted to the outside through the light-transmitting glass 6, and the test performance of the laser radar can be detected in the environment of temperature and humidity testing, so that the point cloud performance can be monitored during the temperature and humidity experiment; by setting the air guide channel 3, the heating module and the heating wire 5, and controlling it by the joint adjustment and control module, when the light-transmitting glass 6 is fogged and frosted, the heating module and the heating wire 5 work, reducing the possibility of fogging of the light-transmitting glass 6, thereby reducing the impact on the transmittance of the light-transmitting glass 6, and improving the accuracy of the radar test. It can be understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used here have the same meaning as the general understanding of ordinary technicians in the field to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and unless specifically defined, they will not be interpreted with idealized or overly formal meanings.
[0039] For the method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the embodiments of the present invention are not limited by the order of the actions described, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.
[0040] It can be known from the description of the above implementation modes that those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be essentially or partly contributed to the prior art in the form of a software product, which can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which can be a personal computer, a server or a network device, etc.) to execute the methods described in the various implementation modes of the present application or certain parts of the implementation modes.
[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A radar light-transmitting temperature box for testing intelligent networked vehicles, characterized in that: include: A test box (1) is provided with a light-transmitting window on the side of the test box (1), and light-transmitting glass (6) is arranged at the light-transmitting window.
2. The radar light-transmitting temperature chamber for testing intelligent networked vehicles according to claim 1, characterized in that: A mounting fixture (2) for fixing the light-transmitting glass (6) and the test box (1) is provided at the connection between the light-transmitting glass (6) and the light-transmitting window. The mounting fixture (2) comprises a front fixture (21) and a rear fixture (22). The rear fixture (22) is detachably connected to the test box (1). The rear fixture (22) is provided with a window matching the size of the light-transmitting glass (6). The light-transmitting glass (6) is installed in the window. Bosses (8) matching the size of the light-transmitting window are fixedly provided around the window. The bosses (8) are clamped with the light-transmitting window. The front fixture (21) is covered on the rear fixture (22) and connected to the rear fixture (22) by bolts. The front fixture (21) is connected to the test box (1) by fasteners.
3. The radar light-transmitting temperature chamber for testing intelligent networked vehicles according to claim 2, characterized in that: Heating wires (5) are arranged around the light-transmitting glass (6).
4. The radar light-transmitting temperature chamber for testing intelligent networked vehicles according to claim 1, characterized in that: The test box (1) is provided with a heating component, the heating component comprising an air guide channel (3) and a heating module, the heating module being arranged on the test box (1), the air guide channel (3) being hollow, one end of the air guide channel (3) being fixedly connected to the air outlet of the heating module, and the other end of the air guide channel (3) pointing to the light-transmitting glass (6).
5. The radar light-transmitting temperature chamber for testing intelligent networked vehicles according to claim 4, characterized in that: The air guide channel (3) adopts a Laval nozzle design.
6. The radar light-transmitting temperature chamber for testing intelligent networked vehicles according to claim 4, characterized in that: The air outlet direction of the air guide channel (3) is parallel to the surface of the light-transmitting glass (6), and the air outlet of the air guide channel (3) is located at a side edge of the light-transmitting glass (6). A wind collecting plate (7) for blocking hot air from the air guide channel (3) is fixedly arranged on the surface of the test box (1), and the wind collecting plate (7) is arranged around the light-transmitting glass (6), and the opening of the wind collecting plate (7) is directly opposite to the air outlet of the air guide channel (3).
7. The radar light-transmitting temperature chamber for testing intelligent networked vehicles according to claim 6, characterized in that: The cross section of the wind collecting plate (7) is arranged in an arc shape.
8. The radar light-transmitting temperature chamber for testing intelligent networked vehicles according to claim 1, characterized in that: The test box (1) is provided with a radar isolation cover, which comprises a support frame and a shielding surface, wherein the shielding surface is sleeved outside the support frame, and the shielding surface is used to change the echo direction of the radar wave, consume the energy of the radar wave, and weaken the reflection of the radio wave.
9. The radar light-transmitting temperature chamber for testing intelligent networked vehicles according to claim 1, characterized in that: The inner wall of the front viewing window of the inner box of the test box (1) and the left and right sides are covered with low-reflective material.
10. The radar light-transmitting temperature chamber for testing intelligent networked vehicles according to claim 1, characterized in that: The test box (1) is provided with a temperature sensor and a joint adjustment and control module, and the joint adjustment and control module controls the heating module and the heating wire (5) according to the temperature, including: The temperature sensor feeds back the temperature inside the box and the temperature of the glass; When performing a low temperature experiment, the heating module is not started when the room temperature is 20°C-0°C, and the power of the heating wire (5) is the first power value; When the temperature drops from 0°C to -40°C, the heating module is controlled to increase linearly from 0W to the second power value, and the heating wire (5) is increased to the third power value; During the high temperature and high humidity experiment, when the temperature sensor detects that the glass temperature differs from the ambient temperature by 10°C, the heating module is controlled to increase linearly from 0W to the fourth power value, and the power of the heating wire (5) is increased to the fifth power value.