Environmental chamber with uniform airflow and control method thereof

Abstract

The invention discloses an environment chamber with uniform airflow and a control method thereof. The environment chamber comprises a chamber main body which is formed into a hollow shell, the air port isolation back plate is fixed in the cabin main body in the mode that the cabin main body is divided into an air supply space and a test space used for containing a test vehicle in the length direction, a main air port capable of being opened and closed and two side air ports are formed in the air port isolation back plate, and the main air port is opposite to the front face of the test vehicle; the two side tuyeres are positioned on two sides of the main tuyere and are positioned on two sides of the tested vehicle when being observed from the length direction; the air supply unit is arranged in the air supply space and is used for blowing air into the test space through the main air port or the two side air ports; the control unit is used for monitoring the air blowing speed of the air supply unit and controlling the main air opening to be closed and the two side air openings to be opened when it is judged that the air speed is below the preset air speed. And / or when it is judged that the air speed is larger than the preset air speed, the main air opening is controlled to be opened and the two side air openings are controlled to be closed. Therefore, uniform and stable airflow control is realized, and the test requirement of the whole vehicle is met.

Description

Technical Field

[0001] The present invention relates to the field of vehicle testing technology, in particular to the field of whole vehicle cold and hot environment testing, and in particular to an environmental chamber with uniform airflow and a control method thereof. Background Art

[0002] With the continuous development of the automobile industry, the performance and safety of automobiles have attracted more and more attention. In order to improve the performance and safety of automobiles, automobile manufacturers are constantly developing new technologies and equipment. Among them, the natural environment chamber for automobile whole vehicle simulation is a very important equipment. Specifically, the natural environment chamber for automobile whole vehicle simulation is a device that can simulate various natural environments, including temperature, altitude, humidity, air pressure, airflow, etc. These will affect the performance and safety of the car, so automobile manufacturers need to use environmental chambers to test the performance of cars in various natural environments.

[0003] However, although the existing environmental chambers have low construction and use costs, the airflow uniformity inside them is poor. Many research results show that the flow field inside the automobile environmental chamber is relatively chaotic, the wind speed distribution at the main fan outlet is uneven, and there is a large gap between the maximum and minimum wind speeds. In particular, it cannot meet the airflow uniformity requirements of the entire vehicle during low-speed and idling tests. Summary of the invention

[0004] Problems to be solved by the invention: In response to the above problems, the installation position and size of the main fan have a certain impact on the flow field of the environmental chamber. Increasing the size of the fan outlet can improve the flow field quality of the environmental chamber test section.

[0005] Therefore, the purpose of the present invention is to provide an environmental chamber with uniform airflow and a control method thereof, which can make the wind speed control in the environmental chamber simpler and more convenient, and the airflow simulation more uniform with low construction cost, simple structure, convenient operation and reliable control, thereby compensating for the current situation of unstable airflow at low speed and idle speed in the environmental chamber and meeting the requirements of vehicle testing.

[0006] Technical means to solve the problem: The present invention provides an environmental chamber with uniform airflow, which comprises: a cabin body formed as a hollow shell; An air vent isolation back plate, which is fixed in the cabin body in a manner of dividing the cabin body into an air supply space and a test space for accommodating a test vehicle along the length direction, and the air vent isolation back plate is provided with an openable and closable main air vent and two side air vents, the main air vent is opposite to the front of the test vehicle, and the two side air vents are located on both sides of the main air vent and on both sides of the test vehicle when viewed from the length direction; an air supply unit, which is disposed in the air supply space and is used to blow air into the test space through the main air port or the two side air ports; and A control unit, which is used to monitor the blowing wind speed of the air supply unit, and when it is judged that the wind speed is below the preset wind speed, control the main air outlet to close and the two side air outlets to open; and / or when it is judged that the wind speed is greater than the preset wind speed, control the main air outlet to open and the two side air outlets to close.

[0007] Alternatively, in the present invention, an extended air duct tube is provided at one side of the main air outlet located at the test space, and the air supply unit blows air toward the test vehicle through the main air outlet along the extended air duct tube.

[0008] Alternatively, in the present invention, the air supply unit includes a fan and an air duct pipe, the fan is arranged at the air inlet end of the air duct pipe, the air outlet end of the air duct pipe is sealed and connected to the main air outlet, and the fan is used to blow air to the test vehicle through the air duct pipe and the main air outlet.

[0009] Alternatively, in the present invention, the air duct pipe is an L-shaped air duct pipe, and a plurality of guide blades are provided at the bending portion thereof.

[0010] Alternatively, in the present invention, the tube wall of the air duct pipe is provided with at least two opening and closing air outlets, and the opening and closing air outlets connect the interior of the air duct pipe with the air supply unit, and the control unit is further used to control the opening and closing air outlets to open when it is judged that the wind speed is below the preset wind speed; and to control the opening and closing air outlets to close when it is judged that the wind speed is greater than the preset wind speed, and the fan is also used to blow air to the two side air outlets through the air duct pipe and the opening and closing air outlets.

[0011] Alternatively, in the present invention, a sunlight simulation device is further provided on the top of the test space, and a top air vent is further provided on the air vent isolation back plate, which is located above the main air vent and opposite to the sunlight simulation device, and the air supply unit is further used to blow air to the sunlight simulation device through the top air vent.

[0012] Alternatively, in the present invention, an opening is provided in the middle of the air outlet isolation back plate, and a movable sealing door is installed on the opening, and the movable sealing door is used to adjust the opening area of ​​the opening, and the opening area of ​​the opening is the main air outlet. The control unit is also connected to the movable sealing door, and is used to adjust the position of the main air outlet or close the main air outlet by controlling the movable sealing door.

[0013] Alternatively, in the present invention, the movable sealing door includes a first sealing door arranged above the opening and a second sealing door arranged below the opening, and the first sealing door and the second sealing door can be opened and closed up and down along the height direction of the cabin body to adjust the position and opening of the main air outlet.

[0014] Alternatively, in the present invention, the environmental chamber further comprises a lifting device, and the lifting device is used to control the air supply unit to rise and fall synchronously with the position of the main air outlet.

[0015] Alternatively, in the present invention, the environmental chamber further includes a differential pressure gauge, which is disposed on the air outlet isolation back plate for monitoring the pressure difference between the air supply space and the test space, and the control unit is further used to receive the pressure difference information sent by the differential pressure gauge, and control the main air outlet to close and the two side air outlets to open when it is determined that the wind speed is below a preset wind speed and the pressure difference is within a preset range.

[0016] The present invention also provides a control method for the environmental chamber based on the above-mentioned uniform airflow, comprising: Adjust the test wind speed required by the test vehicle through the air supply unit; Calculating the difference between the test wind speed and the preset wind speed; When it is judged that the difference is less than or equal to zero, the main air vent is controlled to be closed and the two side air vents are controlled to be opened; when it is judged that the difference is greater than zero, the main air vent is controlled to be opened and the two side air vents are controlled to be closed.

[0017] Alternatively, in the present invention, the air supply unit includes a blower for blowing air, and the step of adjusting the test wind speed required for the test vehicle by the air supply unit includes: determining whether the test wind speed is greater than the preset wind speed, When it is judged that the test wind speed is greater than the preset wind speed, the speed of the fan is adjusted according to the monitored real-time wind speed until the wind speed blown by the fan reaches the test wind speed; when it is judged that the test wind speed is below the preset wind speed, the speed of the fan is directly adjusted to the speed corresponding to the test wind speed.

[0018] Alternatively, in the present invention, the control method further includes: monitoring the pressure difference between the air supply space, i.e., the front side of the air outlet isolation back plate, and the test space, i.e., the rear side of the air outlet isolation back plate; judging whether the pressure difference is within a preset range, and when it is judged that the difference is less than or equal to zero and the pressure difference is within the preset range, controlling the main air outlet to close and the two side air outlets to open.

[0019] Effect of the invention: The environmental chamber according to the present invention can achieve uniform and stable airflow control and better meet the requirements of vehicle testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an environmental test chamber of the prior art; Figure 2 This is a schematic diagram of the structure of the environmental chamber of the first embodiment of the present invention; Figure 3 is a front view of the vent isolation back plate of the environmental cabin according to the first embodiment of the present invention; Figure 4 is a schematic structural diagram of an environmental chamber according to a second embodiment of the present invention; Figure 5 It is a front view of the vent isolation back plate of the environmental chamber of the second embodiment of the present invention.

[0021] Description of reference numerals: 100-cabin body; 110-air supply space; 120-test space; 1-first side air outlet; 2-second side air outlet; 3-main air outlet; 4-top air outlet; 5-guide vane; 51-guide duct; 6-movable sealing door; 61-first sealing door; 62-second sealing door; 7-lifting base; 8-air outlet isolation back plate; 9-fan; 10-air duct pipe; 11-support column; 13-extension air duct pipe; 18-opening and closing air outlet; M1-wind speed detector; Dp-differential pressure gauge; P1, P2-differential pressure sensors; 200-test vehicle. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the following embodiments. It should be understood that the following embodiments are only used to illustrate the present invention, not to limit the present invention. The same or corresponding reference numerals in the figures represent the same components, and repeated descriptions are omitted. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, and those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0024] like Figure 1As shown, in order to achieve the same wind speed at the front end of the test vehicle as the actual wind speed, the existing environmental test chamber usually adopts a front fan with an open air outlet such as a square air outlet. In order to simulate the real driving environment, the oncoming wind speed is guaranteed to be the same as the current vehicle speed. When the vehicle speed is low or idling, the oncoming wind speed tracks the vehicle speed, and the outlet wind speed is low. However, in order to ensure the stability of the temperature and humidity in the environmental test chamber, the additional wind speed when the circulating fan in the chamber is working will increase the wind speed on the surface of the vehicle body, making the airflow uniformity worse. Specifically, when the circulating fan (not shown) is working, the airflow direction is also from the front of the vehicle to the rear of the vehicle. When the wind speed in front of the vehicle is low, this part of the additional airflow will increase the wind speed flowing through the surface of the vehicle body, resulting in poor airflow uniformity. Sometimes, the additional wind speed can be as high as 2.5m / s, which seriously affects the test accuracy when the vehicle is at low speed or idling.

[0025] In order to solve the above-mentioned shortcomings of the existing environmental test chamber, the present invention provides an environmental chamber with uniform airflow, which can ensure the uniformity of airflow when the test vehicle is at low speed or idle speed, and better meet the requirements of vehicle testing. The environmental chamber of the present invention is described below with reference to the accompanying drawings. Figure 2 and Figure 4 The left side of the center paper is defined as the front, and the right side is defined as the back.

[0026] (Example 1) like Figure 2 and Figure 3 As shown, the environmental chamber according to the first embodiment of the present invention includes: a cabin body 100; and an air supply unit (the fan 9 and the air duct 10 described in detail later), an air outlet isolation back plate 8, a differential pressure gauge Dp, a wind speed sensor M1, a power unit and a control unit installed in the cabin body 100. Among them, the power unit is electrically connected to the devices that need power supply, such as the fan 9, the differential pressure gauge Dp, the wind speed sensor M1 and the control unit in the cabin body 100, to provide power for them. In order to simplify the diagram, the power unit and the control unit are not drawn, and they can be configured using the known technology in the art, and no further details are given here. In addition, although not shown in the figure, the cabin body 100 should also include a return air unit for recovering the airflow blown into the test space 120 described later by the air supply unit, and other structures commonly found in vehicle test environmental chambers, such as a hub for the test vehicle 200 to simulate normal driving.

[0027] The cabin body 100 of the present invention is described in detail below. The cabin body 100 is formed as a hollow shell with a certain hardness, and can accommodate at least a test vehicle 200 (the test vehicle 200 in the figure is only an example, and the environmental chamber of the present invention can provide a whole vehicle test for various types of vehicles). In this embodiment, the cabin body 100 is formed in a rectangular parallelepiped shape, but is not limited thereto. In addition, in some embodiments, the cabin body 100 is formed in a movable type, but is not limited thereto.

[0028] Here, the internal volume of the cabin body 100 (specifically, the volume of the test space 120 described later) is preferably such that at least the front of the test vehicle 200 is at least 3 meters away from the front inner wall of the cabin body 100 (here, the front inner wall is the air outlet isolation back plate 8 described later) and the rear of the vehicle is at least 3 meters away from the rear inner wall of the cabin body 100, so as to ensure that sufficient operating space is reserved for vehicle fixed equipment. The two sides of the vehicle are at least 3 meters away from the two inner walls of the cabin body 100, respectively, to ensure that the area where the wind flows can be away from the vehicle during low-speed and idle tests, so as to reduce the impact on the airflow around the vehicle. In addition, in the height direction, the distance from the floor of the cabin body 100 to the top plate is at least 5 meters, so as to provide sufficient height to facilitate the installation of the sunlight simulation equipment described later on the top of the cabin body.

[0029] Preferably, the top of the cabin body 100 can be provided with a reinforcement device (e.g., a reinforcement frame) to place corresponding sunlight simulation equipment and air ducts and other equipment, and the above equipment can be used to adjust the temperature, humidity, light, wind speed and other environmental parameters in the environmental cabin to ensure the data stability of the vehicle test. More preferably, each side wall of the cabin body 100 is provided with a polyurethane foam board with heat preservation and moisture retention functions, thereby reducing the heat exchange between the environmental cabin and the outside as much as possible to reduce the energy consumption of the equipment.

[0030] The following is a detailed description of the tuyere isolation back plate 8 of the present invention. Figure 2 and Figure 3 The vent isolation back plate 8 is fixed inside the cabin body 100 in the form of dividing the internal space of the cabin body 100 into an air supply space 110 where the air supply unit is located and a test space 120 where the test vehicle 200 is located. Specifically, in this embodiment, the cabin body 100 is formed in a rectangular parallelepiped shape, and the vent isolation back plate 8 has the same shape as the cross section of the rectangular parallelepiped in the longitudinal direction, and is arranged perpendicular to the axis of the rectangular parallelepiped in the longitudinal direction. Figure 2 As shown, the air vent isolation back plate 8 is arranged inside the cabin body 100 at a more forward side relative to the center line of the cabin body 100 to ensure that the size of the test space 120 is sufficient to accommodate the test vehicle 200.

[0031] Preferably, the tuyere isolation back plate 8 can be fixed inside the cabin body 100 in the following manner: a plurality of fixing joints are respectively provided on the two side inner walls of the cabin body 100, and the tuyere isolation back plate 8 can be fixed to the plurality of fixing joints by means of screws or buckles. Thus, if the environmental cabin requires equipment upgrade or maintenance, the tuyere isolation back plate 8 can be disassembled to achieve replacement or maintenance, thereby improving the scalability of the environmental cabin. Alternatively, the tuyere isolation back plate 8 can be fixed to the cabin body 100 by other connection methods, such as welding, clamping, bonding, etc. The present invention is not limited thereto.

[0032] Furthermore, if Figure 2and Figure 3 As shown, four air vents 1 to 4 are provided on the air vent isolation back plate 8. Specifically, the main air vent 3, the first side air vent 1, the second side air vent 2 and the top air vent 4, wherein the main air vent 3, the first side air vent 1 and the second side air vent 2 are set to be openable and closable, and the air supply unit can blow out the wind required for the test to the test vehicle 200 in the test space 120 through the main air vent 3, the first side air vent 1 and the second side air vent 2. In this embodiment, the main air vent 3 is arranged near the center of the air vent isolation back plate 8 as an air vent facing the test vehicle 200, and is formed in a rectangular shape. The first side air vent 1 and the second side air vent 2 are arranged on the left and right sides of the main air vent 3, and the first side air vent 1 and the second side air vent 2 are formed in a slender shape as parking air vents. The top air vent 4 is arranged above the main air vent 3, and the top air vent 4 is formed in a slender shape as a normally open air vent. In addition, although the shapes of the air vents 1 to 4 are described above, they are not limited thereto. For example, the air vent 3 can be formed into a circular shape, a diamond shape, etc., as long as a large area ventilation can be achieved. The air vents 1, 2, 4 can be formed into a fence shape, a slit shape, a porous shape, etc., as long as their respective functions can be achieved.

[0033] In a preferred embodiment, an extended air duct 13 is provided on one side of the main air outlet 3 facing the test space. By providing the extended air duct 13, the distance between the main air outlet 3 and the test vehicle 200 can be indirectly shortened. It is ensured that the airflow blown out from the main air outlet 3 can be blown directly to the test vehicle, thereby improving the authenticity of the simulation. In addition, the airflow blown out through the extended air duct 13 can improve the uniformity and stability of the airflow.

[0034] As described above, the wind required for the test flows out through the air vents 1 to 4 of the air vent isolation back plate 8. Generally speaking, the size of the main air vent 3 can be, for example, 1.3m×1m, but is not limited thereto. The air vent size is closely related to the size of the test vehicle, the maximum wind speed of the required airflow, the fan power, the investment cost, etc., and can be determined according to the actual design requirements of the environmental chamber. In addition, the maximum wind speed in the environmental chamber can be set to 180kph, for example, but is not limited thereto, and can be determined according to the test objectives, as long as the investment cost, safety and other issues caused by excessive wind speed are avoided.

[0035] The control unit of the present invention is described in detail below. The control unit is used to monitor the blowing wind speed of the air supply unit (i.e., the test wind speed required by the test vehicle), and when the blowing wind speed of the air supply unit is below the preset wind speed, control the main air outlet 3 to close and open the first side air outlet 1 and the second side air outlet 2; or when the blowing wind speed of the air supply unit is greater than the preset wind speed, control the main air outlet 3 to open and close the first side air outlet 1 and the second side air outlet 2. The preset wind speed corresponds to the preset speed of the test vehicle, and is used to distinguish whether the test vehicle 200 is a low speed or idle speed test or a medium or high speed test. When the speed of the test vehicle 200 is below the preset speed, it indicates that the speed of the test vehicle 200 is low speed or idle speed; when the speed of the test vehicle 200 is greater than the preset speed, the speed of the test vehicle 200 is medium or high speed higher than low speed and idle speed. Specifically, when the test vehicle 200 is tested at a low speed or idle speed, the main air vent 3 is closed and the first side air vent 1 and the second side air vent 2 are opened. At this time, the air supply unit blows out the circulating wind required by the cabin body 100 into the test space through the first side air vent 1 and the second side air vent 2 to simulate the real wind speed airflow when the vehicle is at a low speed or idle speed. When the test vehicle 200 is tested at a medium speed or high speed, the main air vent 3 is opened and the first side air vent 1 and the second side air vent 2 are closed. At this time, the air supply unit only blows out the headwind required by the test vehicle 200 to the test vehicle 200 in the test space 120 through the main air vent 3 to simulate the headwind when the vehicle is traveling at a medium speed or high speed. Among them, the preset wind speed can be, for example, 3kph, but is not limited thereto, and can be adaptively changed according to the specific test model. In addition, the preset wind speed can also be a preset vehicle speed, and the control unit can also directly monitor the test vehicle speed of the test vehicle, and control the opening and closing of the above-mentioned air vents 1, 2, and 3 by judging the magnitude relationship between the test vehicle speed and the preset vehicle speed.

[0036] Furthermore, the relationship between the blowing wind speed and the preset wind speed can be determined by the difference between the blowing wind speed and the preset wind speed. Specifically, the control unit first calculates the difference between the blowing wind speed and the preset wind speed; secondly, determines the size of the difference, and when it is determined that the difference is less than or equal to zero, controls the main air outlet 3 to be closed and the first side air outlet 1 and the second side air outlet 2 to be opened; when it is determined that the difference is greater than zero, controls the main air outlet 3 to be opened and the first side air outlet 1 and the second side air outlet 2 to be closed. This realizes the above-mentioned air outlet opening and closing control.

[0037] More specifically, the main air vent 3 faces the front grille air inlet of the test vehicle 200, and the first side air vent 1 and the second side air vent 2 are located on both sides of the main air vent 3. When viewed from the front (in the length direction of the cabin body), they are located on the left and right sides of the test vehicle 200 relative to the test vehicle. When the test vehicle 200 is at a medium or high speed, the air supply unit blows out the required headwind speed of the test vehicle 200 through the main air vent 3. When the test vehicle 200 is at a low speed or idling state, the air supply unit blows out the circulating air required by the environmental chamber through the first side air vent 1 and the second side air vent 2. The circulating air flows through both sides of the test vehicle, which will not affect the airflow distribution on the surface of the vehicle body, thereby ensuring the uniformity and stability of the airflow.

[0038] In addition, the top vent 4 is a normally open vent, which is used to balance the air pressure between the air supply space 110 and the test space 120 of the environmental chamber. Specifically, the first side vent 1 and the second side vent 2 and the main vent 3 need to be opened and closed alternately according to the vehicle speed. Therefore, if the opening and closing timing of the two is not properly coordinated, the pressure difference on both sides of the vent isolation back plate 8 will cause the vent isolation back plate 8 to deform or be damaged. Therefore, by setting the top vent 4 as a normally open vent, it is ensured that the air on both sides of the top vent 4 is connected, so that the air pressure balance can be ensured, and then the vent isolation back plate 8 is ensured not to be deformed or damaged. In addition, when the test vehicle is at a low speed or idling, that is, when the main air outlet 3 is closed, when the air supply unit blows air into the test space through the first side air outlet 1 and the second side air outlet 2, the air flow of the air supply unit can also pass through the top air outlet 4 to cool the equipment located on the top of the cabin body 100, such as the sunlight simulation equipment. In addition, if the cooling amount required by the sunlight simulation equipment is insufficient, the opening of the first side air outlet 1 and the second side air outlet 2 can be reduced, or even the first side air outlet 1 and the second side air outlet 2 can be completely closed so that all air flows out through the top air outlet 4, which can increase the air flow through the sunlight simulation equipment and improve the cooling effect.

[0039] Preferably, the main air outlet 3, the first side air outlet 1 and the second side air outlet 2 can be opened and closed by the following structure: opening and closing parts such as rolling doors, sliding doors or blinds are arranged on the main air outlet 3, the first side air outlet 1 and the second side air outlet 2. The control unit can realize the opening and closing of the main air outlet 3, the first side air outlet 1 and the second side air outlet 2 by controlling the above components.

[0040] In a preferred embodiment, when the control unit determines that the speed of the test vehicle 200 is below the preset wind speed, the control unit controls the main air outlet 3 to close, and the first side air outlet 1 and the second side air outlet 2 to open synchronously (that is, the opening time of the first side air outlet 1 and the second side air outlet 2 is preferably the same as the closing time of the main air outlet 3), thereby ensuring the normal outflow of airflow.

[0041] Furthermore, the closing timing of the main air vent 3 is preferably coupled with the pressure difference between the front and rear sides of the air vent isolation back plate 8. Specifically, when the vehicle is at high or medium speed, the wind speed is also relatively large, so the air flow blown out by the air supply unit is relatively large, causing the pressure difference between the front and rear sides of the air vent isolation back plate 8 to exceed the normal value. If the vehicle speed is reduced to low speed or idle speed at this time, and the main air vent 3 is closed, the air vent isolation back plate 8 is easily damaged due to the excessive pressure difference. Therefore, it is necessary to delay the closing of the main air vent 3 and reduce the fan speed at the same time, and then close the main air vent 3 after reducing the pressure difference to a preset range, so as to avoid the air vent isolation back plate 8 being damaged by pressure due to the excessive pressure difference. Specifically, the coupling of the closing timing of the main air vent 3 and the pressure difference between the front and rear sides of the air vent isolation back plate 8 can be achieved by the differential pressure gauge Dp described below.

[0042] The differential pressure gauge Dp of the present invention is described in detail below. The differential pressure gauge Dp is disposed on the air outlet isolation back plate 8 and is electrically connected to the control unit, and is used to monitor the pressure difference between the front side and the rear side of the air outlet isolation back plate 8 (i.e., the pressure difference between the air supply space 110 and the test space 120), and transmit the pressure difference information to the control unit. When the control unit determines that the pressure difference is within the preset range, the control unit controls the main air outlet 3 to close and controls the first side air outlet 1 and the second side air outlet 2 to open. Specifically, Figure 2 As shown, differential pressure sensors P1 and P2 of the differential pressure gauge Dp are respectively arranged on the left and right side walls of the vent isolation back plate 8, which are used to measure the pressure difference between the air supply space 110 and the test space 120. More specifically, the differential pressure sensor P1 is arranged in the air supply space 110, and is used to detect the pressure in the air supply space 110. The differential pressure sensor P2 is arranged in the test space 120, and is used to detect the pressure in the test space 120. The differential pressure gauge Dp determines the pressure difference information by comparing the pressure detected by the differential pressure sensor P1 and the differential pressure sensor P2. In this embodiment, if the pressure difference between the front and rear sides of the vent isolation back plate 8 is too large, it is easy to cause damage to the vent isolation back plate 8. Therefore, by monitoring the pressure difference on both sides, when the pressure difference on both sides is within the preset range, the main vent 3 is closed, which can prevent the vent isolation back plate 8 from being damaged by pressure due to closing the main vent 3 when the pressure difference on both sides is too large. The preset range is preferably -50Pa to +50Pa, but is not limited thereto, and the preset range can be determined according to the material, fixing method or fixing parts of the tuyere isolation back plate 8. For example, when the tuyere isolation back plate 8 is made of a material with higher strength, the preset range can also be set to a larger range, or when the tuyere isolation back plate 8 is installed by clamp fixing, the pressure strength it withstands will also be different according to the shape and strength of the equipped clamp, so the preset range can also be adjusted accordingly.

[0043] The air supply unit of the present invention is described in detail below. The air supply unit is installed in the air supply space 110 of the cabin body 100, and includes: an air duct pipe 10, a fan 9, a support column 11 and a plurality of guide blades 5. Specifically, the air duct pipe 10 is an L-shaped air duct pipe 10, including: a connected horizontal extension section and a vertical extension section. The end of the horizontal extension section of the air duct pipe 10 (the air outlet end of the air duct pipe 10) is sealed and connected to the main air outlet 3, and the fan 9 is installed at the top of the vertical extension section of the air duct pipe 10 (the air inlet end of the air duct pipe 10). As a result, the fan 9 is connected to the main air outlet 3 through the air duct pipe 10, and the wind blown by the fan 9 is blown from the main air outlet 3 to the test vehicle 200 in the test space 120 through the air duct pipe 10. In addition, one end of the support column 11 is connected to the bottom plate of the cabin body 100, and the other end is supported by the horizontal extension section of the air duct 10, so that the air duct 10 is installed in the air supply space 110 through the support column 11, but it is not limited thereto. The air duct 10 can also be suspended in the air supply space 110 by a suspension or other device. In addition, Figure 2 In the embodiment, the opening of the vertical extension section of the air duct pipe 10 is arranged upward, but it can also be arranged downward. The present invention does not limit the installation and setting method of the air duct pipe 10. The air duct pipe 10 may not be L-shaped, but may be S-shaped or other shapes such as horizontal branches. The advantage of setting it to L-shape is that it can reduce its footprint, and the L-shape can also reduce the wind speed and stabilize the airflow, preventing the overly turbulent airflow from affecting the measurement accuracy.

[0044] In addition, a plurality of guide blades 5 are arranged at the corner between the horizontal extension section and the vertical extension section of the air duct 10, and the plurality of guide blades 5 are arranged at intervals so as to form a plurality of guide channels 51 between the plurality of guide blades 5 and between the guide blades 5 and the inner wall of the air duct 10. Thus, the wind blown out by the fan 9 is guided by the guide channel 51, thereby reducing the wind resistance at the corner. In addition, the shape of the guide blade 5 is preferably streamlined, and the number and installation position of the guide blade 5 can be confirmed in advance through simulation tests. The installation angle of the guide blade 5 can be determined in advance as a fixed angle through tests as described above, or can be set to be adjusted in real time according to test requirements such as wind speed and air volume. In addition, during the debugging process, by measuring the uniformity of the temperature, humidity, and wind speed on the surface of the main air outlet 3, and according to the test results of the uniformity, equipment such as a flow equalizer can also be installed in the air duct 10 to further improve the uniformity of the air outlet.

[0045] Furthermore, an opening and closing air port 18 is provided on the pipe wall of the air duct pipe 10, connecting the interior of the air duct pipe and the air supply space 110. Preferably, there are two opening and closing air ports 18, and the two opening and closing air ports 18 are arranged in the horizontal extension section of the air duct pipe 10 relative to the first side air port 1 and the second side air port 2. The fan 9 can supply air to the first side air port 1 and the second side air port 2 through the two opening and closing air ports 18 of the air duct pipe 10, so as to blow air to both sides of the test vehicle 200. Specifically, when the test vehicle is at a medium or high speed, the main air vent 3 is opened, the opening and closing air vent 18 of the air duct 10 is closed, the first side air vent 1 and the second side air vent 2 are closed, and the fan 9 blows out the required oncoming wind to the test vehicle 200 only through the main air vent 3; when the test vehicle is at a low speed or idling, the main air vent 3 is closed, the opening and closing air vent 18 of the air duct 10 is opened, the first side air vent 1 and the second side air vent 2 are opened, and the fan 9 blows out circulating wind to both sides of the test vehicle 200 through the opening and closing air vent 18 of the air duct 10 and the first side air vent 1 and the second side air vent 2 (at this time, the wind of the fan 9 will also be blown into the upper part of the test space 120 through the top air vent 4 to cool the sunlight simulation device above). In this way, the uniformity and stability of the air flow are ensured. Preferably, due to the presence of the opening and closing air vents 18, the first side air vents 1 and the second side air vents 2 can also be set as normally open air vents, that is, the opening and closing of the first side air vents 1 and the second side air vents 2 relative to the main air vent 3 is indirectly realized through the opening and closing air vents 18; or the opening and closing air vents 18 can also be normally open air vents, that is, the opening and closing of the first side air vents 1 and the second side air vents 2 relative to the main air vent 3 is realized by the opening and closing of the first side air vents 1 and the second side air vents 2 themselves. Alternatively, as mentioned above, the opening and closing air vents 18, the first side air vents 1 and the second side air vents 2 are all set as openable and closable air vents. More preferably, a connecting air duct (not shown) is connected between the two opening and closing air vents 18 and the first side air vents 1 and the second side air vents 2, and the fan 9 can blow air to the first side air vents 1 and the second side air vents 2 through the air duct pipe 10 and the connecting air duct. It is also possible that, instead of blowing air to the first side air vents 1 and the second side air vents 2 through the fan 9, another fan and air duct can be separately set for the first side air vents 1 and the second side air vents 2. In addition, there may be more than two opening and closing air ports 18. The present invention does not limit the specific form of the air supply unit.

[0046] The wind speed detector M1 of the present invention is described in detail below. The wind speed detector M1 is disposed at the outlet end of the air duct 10 to detect the wind speed at the outlet end. Preferably, it is disposed on the main air outlet 3. More preferably, it is disposed at the outlet end of the extended air duct pipe 13. Thus, the detected wind speed is more consistent with the wind speed of the test vehicle 200 in direct contact, thereby reducing errors.

[0047] Here, we first explain the general steps of testing a vehicle through an environmental chamber. Of course, the following sequence of steps is only an example. First, the operator accelerates the test vehicle on the hub to the desired test vehicle. At this time, the hub will generate a rotation speed corresponding to the test speed of the vehicle. The air supply unit will then receive the rotation speed and blow the corresponding test wind speed to the test vehicle in the test space based on the rotation speed. When simulating the headwind received by the test vehicle, it is necessary to ensure that the wind speed of the headwind is the same as the speed of the vehicle. Therefore, when simulating the headwind, the test wind speed needs to be the same as the test vehicle speed. Based on this, the use of the wind speed detector M1 of the present invention in the environmental chamber testing process is explained. When the air supply unit adjusts the test wind speed required by the test vehicle, it will first determine whether the test wind speed is greater than the above-mentioned preset wind speed V1. When it is determined that the test wind speed is greater than the preset wind speed V1, the wind speed detector M1 is used to detect the current wind speed blown by the fan in real time and adjust the rotation speed of the fan 9, thereby realizing the adjustment of the wind speed at the air outlet (specifically, the wind speed is monitored while the rotation speed of the fan 9 is adjusted, and the adjustment is stopped when the wind speed reaches the test wind speed); when it is determined that the test wind speed is less than the preset wind speed V1, since the error of the actual measured value of the wind speed detector M1 increases at this time (when the wind speed is low, the airflow disturbance is large, and the accuracy of the wind speed measured by the wind speed detector M1 will become lower, so the error of the actual measured value increases), the speed of the fan 9 is directly adjusted to the speed corresponding to the test wind speed to realize the control of the wind speed at the air outlet (specifically, the speed of the fan 9 is directly adjusted to the speed corresponding to the test wind speed through the mapping relationship table described later). Among them, the preset wind speed V1 can be determined during the actual test process. During the test, the wind speed is adjusted in real time according to the speed of the test vehicle. The reason for this test is that at low speeds, the airflow in front of the vehicle is relatively low, which leads to inaccurate sensor testing, which in turn causes the fan speed to fluctuate. The speed fluctuation will cause the airflow to be unstable, which can easily lead to a vicious cycle. After separate control, the instability of low-speed airflow can be avoided.

[0048] More specifically, during the test process, a mapping relationship table can be established between the rotation speed of the fan 9 and the actual wind speed value detected by the wind speed detector M1, the air temperature, etc., so that the rotation speed of the fan 9 corresponding to the preset wind speed can be determined by looking up the table during the vehicle test, and this is used as the control variable of the wind speed at the air outlet. The mapping relationship table can be obtained through multiple experiments, that is, the mapping relationship table of the corresponding relationship is obtained by multiple tests of the fan rotation speed at any temperature and any wind speed. Therefore, when a certain wind speed is required, the required rotation speed of the fan is directly obtained using the mapping relationship table.

[0049] The following describes the general working process of the control cabin in the vehicle medium speed or high speed test state and the low speed or idle speed test state of the present invention.

[0050] In the vehicle's medium-high speed test state, the wind speed detected by the wind speed detector M1 exceeds the preset wind speed V1. At this time, the open and close air vents 18 are closed, the main air vents 3 are opened, and the airflow of the fan 9 is all blown from the main air vents 3 to the test vehicle 200; when the vehicle is transformed into a low-speed or idle test state, the required wind speed (wind speed below the preset wind speed V1) is found using the mapping relationship table, and the speed of the fan 9 is adjusted to the corresponding speed. At the same time, the control unit closes the main air vents 3, opens the open and close air vents 18 and the side air vents 1 and 2, and the airflow of the fan 9 is blown from the open and close air vents 18 and the side air vents 1 and 2 to the two sides of the test vehicle 200. Conversely, when the vehicle is transformed into a medium-high speed test state, the required medium-high speed wind speed is found using the mapping relationship table, and the speed of the fan 9 is adjusted to the corresponding speed. At the same time, the control unit opens the main air vents 3, closes the open and close air vents 18 and the side air vents 1 and 2, and the airflow of the fan 9 is blown from the main air vents 3 to the front of the test vehicle 200.

[0051] Based on the above, since the main air vent 3 of the air vent isolation back plate 8 can be opened and closed, compared with the open air outlet, the main air vent 3 can be closed when the vehicle is idling or slow. It can ensure that there is no wind in front of and around the vehicle at idle and slow speeds, and achieve the test goal of zero idle airflow. When the main air vent 3 is closed, the side air vents 1 and 2 are opened to maintain the circulating airflow in the cabin, ensuring that the temperature and humidity in the cabin are within the required range, and the top air vent 4 ensures the cooling of the lighting equipment. As a result, the circulating air in the environmental cabin flows normally, ensuring that the environmental conditions are more stable and closer to reality. At low speeds, the airflow uniformity is better, the uniform airflow can cover the entire vehicle surface, and the test results are more accurate.

[0052] (Example 2) The structure of the second embodiment of the present invention is basically the same as that of the first embodiment, and the difference lies in the structure related to the main air outlet 3. The second embodiment of the present invention sets the main air outlet 3 to be movable up and down, so that the environmental chamber of the present invention can adapt to vehicles of different heights. Here, only the lifting structure of the main air outlet 3 that is different from the first embodiment is described in detail, and the same structure is not repeated.

[0053] Specifically, if Figure 4 and Figure 5 As shown, the middle part of the air outlet isolation back plate 8 has an opening with a movable sealing door 6 installed. The movable sealing door 6 can adjust the opening area of ​​the opening along the height direction. The area where the opening is opened is the main air outlet 3. The movable sealing door 6 adjusts the position of the main air outlet 3 by adjusting the opening area of ​​the opening.

[0054] Specifically, the movable sealing door 6 includes a first sealing door 61 disposed above the opening and a second sealing door 62 disposed below the opening. The first sealing door 61 and the second sealing door 62 can adjust the opening position and opening degree of the opening in the up and down directions. Figure 5As shown, when the first sealing door 61 is closed downward to the upper third of the opening, and the second sealing door 62 is closed upward to the lower third of the opening, the middle third of the opening retained between the first sealing door 61 and the second sealing door 62 is the main air outlet 3. In addition, although shown in the figure, if the main air outlet 3 needs to be moved upward to the upper third of the opening, it is only necessary to fully open the first sealing door 61 and close the second sealing door 62 upward to the middle third of the opening (i.e., two-thirds), at which time the upper third of the opening retained between the first sealing door 61 and the second sealing door 62 is the main air outlet 3. Thus, by adjusting the opening and closing positions of the first sealing door 61 and the second sealing door 62, the position of the main air outlet 3 can be adjusted. It should be noted that the above description of dividing the opening into three sections of one-third is only for the convenience of explanation, and does not limit the main air outlet adjustment position of the present invention to the three positions. The main air outlet 3 of the present invention can be adjusted to any position of the opening by adjusting the opening of the first sealing door 61 and the second sealing door 62. In addition, the first sealing door 61 and the second sealing door 62 can also completely close the opening, thereby closing the main air outlet 3. Specifically, the main air outlet 3 can be closed by completely connecting the first sealing door 61 and the second sealing door 62.

[0055] Optionally, the first sealing door 61 and the second sealing door 62 are rolling curtain sealing doors, and the opening and closing of the opening and the adjustment of the main air outlet position can be achieved by rolling up and extending the first sealing door 61 and the second sealing door 62. Alternatively, the first sealing door 61 and the second sealing door 62 are lifting sealing doors, and the opening and closing of the opening and the adjustment of the main air outlet position can be achieved by lifting the first sealing door 61 and the second sealing door 62. The present invention does not limit the specific form of the movable sealing door 6.

[0056] In addition, to ensure the normal circulation of airflow, the air duct pipe 10 and the extended air duct pipe 13 which are sealed and connected to the main air outlet 3 are also provided with corresponding lifting devices corresponding to the adjustment of the main air outlet 3. Specifically, the support column 11 in the first embodiment can be replaced with a lifting base 7, and the height of the air duct pipe 10 and the extended air duct pipe 13 can be adjusted by the lifting base 7 in a manner synchronized with the position adjustment of the main air outlet 3. The lifting base 7 can, for example, drive the air duct pipe 10 and the extended air duct pipe 13 to rise and fall by means of a hydraulic cylinder, a screw drive, or the like.

[0057] In addition, the upper edge of the air outlet end of the air duct pipe 10 is sealed against the lower end of the first sealing door 61, the lower edge of the air outlet end of the air duct pipe 10 is sealed against the upper end of the second sealing door 62, and the two sides of the air outlet end of the air duct pipe 10 are slidably sealed against the two sides of the opening; correspondingly, the air inlet end of the extended air duct pipe 13 is sealed against the lower end of the first sealing door 61, the lower edge of the air inlet end of the extended air duct pipe 13 is sealed against the upper end of the second sealing door 62, and the two sides of the air inlet end of the extended air duct pipe 13 are slidably sealed against the two sides of the opening. As a result, the air duct pipes 10, 13 and the main air outlet 3 rise or fall synchronously, so that the original relative position of the seal remains unchanged, the sealing effect remains unchanged, and the air duct pipe 10 and the extended air duct pipe 13 are sealed against the main air outlet 3.

[0058] In this embodiment, the lifting base 7 is placed on the bottom surface of the cabin body 100, but is not limited thereto. For example, it can also be hung on the inner wall of the cabin body 100, as long as the lifting function can be achieved. In addition, the position of the fan 9 can be fixed or can be lifted and lowered with the air duct 10.

[0059] In addition, although not shown in the figure, the present invention is also provided with a control device for simultaneously controlling the opening and closing of the lifting base 7, the first sealing door 61 and the second sealing door 62. The control device can be, for example, the control unit in the above-mentioned embodiment 1. The control device can achieve synchronous control through a control method, which will not be repeated here.

[0060] Thus, the height of the main air outlet 3 is adjusted by the movable sealing door 6 and the lifting base 7, so that the air supply unit can blow air into the test space at different heights, thereby making the environmental chamber of the present invention adaptable to vehicles of different heights.

[0061] In another specific embodiment, the present invention further provides a method for controlling an environmental chamber with uniform airflow based on the above embodiment, comprising: Adjust the test wind speed required by the test vehicle through the air supply unit; Calculating the difference between the test wind speed and the preset wind speed; When it is judged that the difference is less than or equal to zero, the main air outlet 3 is controlled to be closed and the two side air outlets 1 and 2 are opened; when it is judged that the difference is greater than zero, the main air outlet 3 is controlled to be opened and the two side air outlets 1 and 2 are closed.

[0062] In another specific embodiment, the test wind speed required for the test vehicle is adjusted by the air supply unit, including: judging whether the test wind speed is greater than the preset wind speed, and when judging that the test wind speed is greater than the preset wind speed, adjusting the rotation speed of the fan according to the monitored real-time wind speed until the wind speed blown by the fan reaches the test wind speed; and when judging that the test wind speed is below the preset wind speed, directly adjusting the rotation speed of the fan to a rotation speed corresponding to the test wind speed.

[0063] In another specific embodiment, the control method further includes: Monitor the pressure difference between the air supply space 110, i.e., the front side of the air outlet isolation back plate 8, and the test space 120, i.e., the rear side of the air outlet isolation back plate 8; determine whether the pressure difference is within a preset range, and when it is determined that the difference is less than or equal to zero and the pressure difference is within the preset range, control the main air outlet 3 to close and the two side air outlets 1 and 2 to open.

[0064] The above specific implementations further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above is only a specific implementation of the present invention and is not limited to the protection scope of the present invention. Without departing from the purpose of the basic characteristics of the present invention, the present invention can be embodied in various forms. Therefore, the implementation forms in the present invention are used for illustration rather than limitation. Since the scope of the present invention is limited by the claims rather than the specification, and all changes within the scope defined by the claims or within the equivalent scope of the scope defined by the claims should be understood to be included in the claims. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An environmental chamber with uniform airflow, characterized in that: have: a cabin body formed as a hollow shell; An air vent isolation back plate, which is fixed in the cabin body in a manner of dividing the cabin body into an air supply space and a test space for accommodating a test vehicle along the length direction, and the air vent isolation back plate is provided with an openable and closable main air vent and two side air vents, the main air vent is opposite to the front of the test vehicle, and the two side air vents are located on both sides of the main air vent and on both sides of the test vehicle when viewed from the length direction; an air supply unit, which is arranged in the air supply space and is used to blow air into the test space through the main air outlet or the two side air outlets; as well as A control unit, which is used to monitor the blowing wind speed of the air supply unit, and when it is judged that the wind speed is below the preset wind speed, control the main air outlet to close and the two side air outlets to open; and / or when it is judged that the wind speed is greater than the preset wind speed, control the main air outlet to open and the two side air outlets to close.

2. The environmental chamber with uniform airflow according to claim 1, characterized in that: An extended air duct is provided at one side of the main air outlet located at the test space, and the air supply unit blows air toward the test vehicle through the main air outlet along the extended air duct.

3. The environmental chamber with uniform airflow according to claim 1, characterized in that: The air supply unit includes a fan and an air duct pipe, wherein the fan is arranged at the air inlet end of the air duct pipe, and the air outlet end of the air duct pipe is sealed and connected to the main air outlet, and the fan is used to blow air to the test vehicle through the air duct pipe and the main air outlet.

4. The environmental chamber with uniform airflow according to claim 3, characterized in that: The air duct pipe is an L-shaped air duct pipe, and a plurality of guide blades are arranged at the bending part thereof.

5. The environmental chamber with uniform airflow according to claim 3, characterized in that: The wall of the air duct is provided with at least two opening and closing air ports, and the opening and closing air ports connect the interior of the air duct with the air supply unit. The control unit is also used to control the opening and closing vents to open when it is determined that the wind speed is below a preset wind speed; and to control the opening and closing vents to close when it is determined that the wind speed is greater than the preset wind speed. The fan is also used to blow air toward the two side air outlets through the air duct and the open and close air outlets.

6. The environmental chamber with uniform airflow according to claim 1, characterized in that: A sunlight simulation device is also provided on the top of the test space, and a top vent is also provided on the vent isolation back plate, which is located above the main vent and opposite to the sunlight simulation device. The air supply unit is also used to blow air to the sunlight simulation device through the top air outlet.

7. The environmental chamber with uniform airflow according to claim 1, characterized in that: An opening is provided in the middle of the air outlet isolation back plate, and a movable sealing door is installed on the opening. The movable sealing door is used to adjust the opening area of ​​the opening, and the opening area of ​​the opening is the main air outlet. The control unit is also connected to the movable sealing door, and is used to adjust the position of the main air outlet or close the main air outlet by controlling the movable sealing door.

8. The environmental chamber with uniform airflow according to claim 7, characterized in that: The movable sealing door comprises a first sealing door arranged above the opening and a second sealing door arranged below the opening. The first sealing door and the second sealing door can be opened and closed up and down along the height direction of the cabin body to adjust the position and opening of the main air outlet.

9. The environmental chamber with uniform airflow according to claim 7, characterized in that: Also includes: A lifting device is used to control the air supply unit to rise and fall synchronously with the position of the main air outlet.

10. The environmental chamber with uniform airflow according to claim 1, characterized in that: Also includes: A differential pressure gauge is provided on the air outlet isolation back plate and is used to monitor the pressure difference between the air supply space and the test space. The control unit is also used to receive the pressure difference information sent by the differential pressure gauge, and when it is determined that the wind speed is below a preset wind speed and the pressure difference is within a preset range, control the main air outlet to close and the two side air outlets to open.

11. A control method for an environmental chamber with uniform airflow based on any one of claims 1 to 10, characterized in that: include: Adjust the test wind speed required by the test vehicle through the air supply unit; Calculating the difference between the test wind speed and the preset wind speed; When it is judged that the difference is less than or equal to zero, the main air vent is controlled to be closed and the two side air vents are controlled to be opened; when it is judged that the difference is greater than zero, the main air vent is controlled to be opened and the two side air vents are controlled to be closed.

12. The control method according to claim 11, characterized in that: The air supply unit includes a blower for blowing air, and the method of adjusting the test wind speed required by the test vehicle through the air supply unit includes: Determine whether the test wind speed is greater than the preset wind speed, When it is determined that the test wind speed is greater than the preset wind speed, the rotation speed of the fan is adjusted according to the monitored real-time wind speed until the wind speed blown by the fan reaches the test wind speed; When it is determined that the test wind speed is below the preset wind speed, the rotation speed of the fan is directly adjusted to a rotation speed corresponding to the test wind speed.

13. The control method according to claim 11, characterized in that: Also includes: Monitor the pressure difference between the air supply space, i.e., the front side of the air outlet isolation back plate, and the test space, i.e., the rear side of the air outlet isolation back plate; Determine whether the pressure difference is within a preset range, When it is determined that the difference is less than or equal to zero and the pressure difference is within a preset range, the main air vent is controlled to be closed and the two side air vents are controlled to be opened.

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