Semi-wind tunnel system for automobile test environment simulation and control method thereof

Abstract

The invention relates to the field of vehicle environment testing, in particular to a semi-wind tunnel system for vehicle testing environment simulation and a control method of the semi-wind tunnel system. The air supply unit, the air return unit, the circulation unit, the power unit, the power generation recovery unit and the control unit are installed on the system body. Wherein the air supply unit and the vehicle test position are correspondingly arranged on the front side of the system main body, the air return unit and the vehicle test position are correspondingly arranged on the rear side of the system main body, and the circulation unit and the vehicle test position are correspondingly arranged on the upper side of the system main body. The power generation recovery unit and a vehicle test position are correspondingly arranged on the lower side of the system main body. According to the semi-wind tunnel system for automobile test environment simulation, the defects of the environment simulation cabin and the heat energy wind tunnel are avoided, the advantages of the environment simulation cabin and the heat energy wind tunnel are integrated, and the semi-wind tunnel system for automobile test environment simulation is uniform in temperature and humidity, stable in airflow, low in manufacturing cost and low in energy consumption.

Description

Technical Field

[0001] The invention relates to the field of vehicle environmental testing, and in particular to a semi-wind tunnel system for simulating an automobile testing environment and a control method thereof. Background Art

[0002] In automobile development, environmental simulation (sometimes referred to as ring model) testing is an important tool. Automobile environmental simulation chambers mainly include environmental simulation chambers and thermal wind tunnels, which are used to test automobiles and study their aerodynamic performance. For example, Tongji University Shanghai Ground Transportation Wind Tunnel Center has released a whole vehicle environmental simulation test chamber, which improves the control accuracy and efficiency of the original temperature and humidity control and intake and exhaust altitude simulation. At the same time, it has added a whole vehicle chassis dynamometer and fast charging equipment, and has made explosion-proof designs and treatments for flammable gases such as hydrogen, which can better meet the experimental needs of whole vehicles and parts.

[0003] However, although the environmental simulation cabin has low cost and short construction period, the temperature, humidity and airflow uniformity in the cabin are poor, especially during low-speed and idling tests, which makes it difficult to meet the test requirements. In contrast, the thermal wind tunnel is an experimental device that can artificially generate and control airflow to simulate the flow of gas around the car, measure the effect of airflow on objects and observe physical phenomena. It is used to simulate the test environment (temperature, humidity, light, wind speed, etc.) required for the test. Its temperature, humidity and airflow uniformity are good, but it has the disadvantages of long construction period, high cost and high operating energy consumption. Summary of the invention

[0004] Problems to be solved by the invention: In view of the above problems, the purpose of the present invention is to provide a semi-wind tunnel system for automobile test environment simulation and a control method thereof, which can avoid the shortcomings of environmental simulation cabins and thermal wind tunnels while combining the advantages of both, and provide automobile test environment simulation equipment with uniform temperature and humidity, stable airflow, low cost and low energy consumption for automobile development.

[0005] Technical means to solve the problem: The present invention provides a semi-wind tunnel system for simulating an automobile test environment, comprising: a system body; and an air supply unit, an air return unit, a circulation unit, a power unit, a power generation recovery unit, and a control unit installed on the system body; wherein the air supply unit is arranged at the front side of the system body corresponding to a vehicle test position, the air return unit is arranged at the rear side of the system body corresponding to the vehicle test position, the circulation unit is arranged at the upper side of the system body corresponding to the vehicle test position, and the power generation recovery unit is arranged at the lower side of the system body corresponding to the vehicle test position.

[0006] It may also be that in the present invention, The control unit is used to control the operation of the entire system, and is connected to the air supply unit, the return air unit, the circulation unit, the power unit, and the power generation recovery unit, and performs the following control: Opening the return air unit to allow the vehicle to enter the system body; Controlling the circulation unit to adjust the system body until a specified test condition is reached; Controlling the power generation recovery unit to simulate vehicle road running resistance to meet relevant test requirements; and The air supply unit, the air return unit, and the circulation unit are controlled to provide corresponding front wind according to the vehicle speed to simulate the actual driving process.

[0007] It may also be that in the present invention, The air supply unit comprises: a relay fan, an air supply duct, an air supply cabin and a partition wall; wherein, The partition wall is located inside the system body and divides it into the air supply cabin and the vehicle test space. The air supply cabin is connected to the installation space of the relay fan. One end of the air supply duct is connected to the installation space of the relay fan, and the other end is connected to the circulation unit.

[0008] It may also be that in the present invention, The partition wall includes: a front air supply port corresponding to the test vehicle; a plurality of idle side air outlets located on both sides of the front air supply port; a plurality of idle upper air outlets located above the front air supply port and the idle side air outlet; and an air outlet guide vane arranged near the front air supply port in a form protruding toward the vehicle test space.

[0009] It may also be that in the present invention, The front air supply port is formed into an openable and closable structure, the idle side air outlet is arranged on both sides of the front air supply port and is formed into a slit shape, the idle upper air outlet is arranged on the upper side of the partition wall and is formed into a small window shape, and the air outlet guide blade is formed into a structure with an adjustable blade angle.

[0010] It may also be that in the present invention, The control unit controls as follows: When the vehicle is traveling at high or medium speed, the front air supply port on the partition wall is opened, so that the circulation unit and the air supply unit work together, and the power generation recovery unit is preferentially used to supply power to the air supply unit and the circulation unit; When the vehicle is running at a low speed or idling, the front air supply port on the partition wall is closed, the circulation unit is operated and the relay fan is stopped, and the power unit supplies power to the air supply unit.

[0011] It may also be that in the present invention, The return air unit includes a return air cabin, a return air duct and a return air outlet guide vane; wherein, The return air compartment is connected to the vehicle test space in the system body via an opening located at the rear side of the system body, one end of the return air duct is connected to the return air compartment, and the other end is connected to the circulation unit, and the return air outlet guide vane is installed near the opening on the rear side of the system body in a form protruding toward the vehicle test space.

[0012] It may also be that in the present invention, The circulation unit includes: a circulation fan, a cooling heat exchanger and a heating heat exchanger; wherein, The circulation fan is installed in the circulation unit on a side close to the return air unit, the heating heat exchanger is installed in the circulation unit on a side close to the air supply unit, and the cooling heat exchanger is installed in the circulation unit between the circulation fan and the heating heat exchanger.

[0013] It may also be that in the present invention, The power generation recovery unit is connected to the air supply unit, the power unit, and the control unit, and includes a chassis dynamometer and a transformer; wherein: The chassis dynamometer receives power from the power unit to provide running resistance when the vehicle is running at a low speed or idling, and receives running power from the vehicle to generate electricity when the vehicle is running at a high speed, thereby supplying power to the air supply unit via the transformer.

[0014] The present invention also provides a control method based on the above-mentioned semi-wind tunnel system, comprising: Opening the return air unit to allow the vehicle to enter the system body; Controlling the circulation unit to adjust the system body until a specified test condition is reached; Controlling the power generation recovery unit to simulate vehicle road running resistance to meet relevant test requirements; and The air supply unit, the air return unit, and the circulation unit are controlled to provide corresponding front wind according to the vehicle speed to simulate the actual driving process, wherein: When the vehicle is traveling at a high or medium speed, the circulation unit and the air supply unit are made to work together, and the power generation recovery unit is made to supply power to the air supply unit and the circulation unit preferentially; When the vehicle is running at a low speed or idling, the circulation unit is operated and the relay fan is stopped, and the power unit supplies power to the circulation unit.

[0015] Effect of the invention: According to the present invention, a semi-wind tunnel system for simulating the automobile test environment can be provided which avoids the disadvantages of an environmental simulation cabin and a thermal wind tunnel while integrating the advantages of both, thereby achieving uniform temperature and humidity, stable airflow, low cost, and low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a half wind tunnel system according to an embodiment of the present invention from a front view perspective; Figure 2 is a schematic structural diagram of a partition wall 61 of an air supply unit of a semi-wind tunnel system; Figure 3 It is a schematic diagram of the structure of the half wind tunnel system from a bird's-eye view; Explanation of symbols: 1-circulation fan; 2-relay fan; 3-cooling heat exchanger; 4-heating heat exchanger; 5-test vehicle; 6-air supply cabin; 61-partition wall; 7-return air cabin; 8-chassis dynamometer; 9-air supply duct; 10-return air duct; 11-vehicle front air supply outlet; 12-idle side air outlet; 13-idle upper air outlet; 14-return air outlet guide vane; 15-air outlet guide vane. DETAILED DESCRIPTION

[0017] 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.

[0018] 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.

[0019] Hereinafter, the semi-wind tunnel system for simulating the automobile test environment of the present invention will be described with reference to the above-mentioned drawings, and Figure 1 The left side of the paper is defined as the back, and the right side is defined as the front. Figure 1 As shown, a semi-wind tunnel system for simulating an automobile test environment according to an embodiment of the present invention comprises: a system body B; and an air supply unit, a return air unit, a circulation unit, a power unit, a power generation recovery unit, and a control unit installed on the system body B. Specifically, the system body B is formed as a hollow shell with a certain hardness, and at least the test vehicle 5 can be accommodated inside. In this embodiment, the system body B is formed in a rectangular parallelepiped shape, but is not limited thereto. In some embodiments, the system body B is formed in a movable type, but is not limited thereto. In some embodiments, in addition to at least covering the test vehicle 5, the test space in front, behind, left and right of the test vehicle 5 should be ensured after the test vehicle 5 is fixed. Preferably, the distance from the front of the vehicle to the inner wall is at least 3m, the distance from the rear of the vehicle to the inner wall is at least 3m, and the distance from the two sides of the vehicle to the inner wall is at least 3m. In the height direction, it is at least 5m from the floor to the top plate to facilitate the installation of the sunlight simulation equipment. In addition, the system body B is usually composed of steel plates with insulation, and glue is used to seal between the steel plates to avoid water ingress in a high temperature environment to affect the insulation effect.

[0020] The air supply unit is arranged at the front side of the system body B, and includes: a relay fan 2, an air supply duct 9, an air supply cabin 6, and a partition wall 61. Specifically, the system body B has an opening at a position corresponding to the vehicle test position on the front side surface, and the relay fan 2 is installed at the front side of the opening, so as to provide airflow during vehicle testing. The installation space (also called cabin) of the relay fan 2 can be as follows: Figure 1 As shown, it protrudes outward from the system body B, and can also be accommodated in the system body B. In this embodiment, a grille for uniform airflow is installed at the opening on the front side surface of the system body B. In addition, in this embodiment, the relay fan 2 adopts an axial flow fan with a narrow axial direction, but is not limited to this. In addition, in this embodiment, the entire system mainly adopts the method of circulating air flow inside to save energy and speed up the stabilization time of temperature and humidity. In addition, a supplementary port for external air flow (not shown) can also be added to the return air duct 10 described later.

[0021] The air supply duct 9 is formed in a cylindrical shape, one end of which is connected to the installation space of the relay fan 2, and the other end is connected to the circulation unit described later, so that the air supply unit and the circulation unit are connected. Figure 1 It is shown as being installed outside the system body B, but it can certainly be installed inside the system body B.

[0022] The air supply cabin 6 is formed on the front side of the system body B through a partition wall 61 and is connected to the relay fan 2. Specifically, the partition wall 61 is located inside the system body B and divides it into the air supply cabin 6 and the vehicle test space. The air supply cabin 6 is connected to the installation space of the relay fan 2 through an opening on the front side surface of the system body B. More specifically, Figure 2 As shown, the partition wall 61 includes: a front air supply port 11 corresponding to the test vehicle 5, a plurality of idle side air outlets 12 located on both sides of the front air supply port 11, a plurality of idle upper air outlets 13 located above the front air supply port 11 and the idle side air outlet 12, and an air outlet guide vane 15 arranged near the front air supply port 11 in a form of protruding toward the automobile test space.

[0023] More specifically, in this embodiment, the front air outlet 11 is located at the lower center of the partition wall 61, and is formed into a door shape that can be opened and closed, but as long as the functions of opening and closing described later can be realized, the specific form is not limited. After the front air outlet 11 is opened, the wind from the air supply unit (to be precise, the relay fan 2) can pass through the air supply cabin 6, and after the airflow is guided by the air outlet guide blade 15, it is sent to the vehicle body (specifically, the front side of the vehicle). The idle side air outlet 12 is opened on both sides of the front air outlet 11, that is, on both sides of the partition wall 61, for example, in a slit shape, and the opening direction of the idle side air outlet 12 is away from the test vehicle 5 to ensure that the airflow will not affect the airflow around the test vehicle 5 when it flows through. Specifically, the idle side air outlet 12 can be formed into a shutter type, for example, to even and guide the airflow, and it is preferred to adjust the blade angle on the shutter to make it away from the test vehicle 5, and guide the airflow (wind) to the outside. The idle upper air outlet 13 opens on the upper side of the partition wall 61, for example, in the shape of a small window, and the opening direction of the idle upper air outlet 13 faces the sunlight simulation device to ensure that the airflow will not affect the airflow around the test vehicle when it flows through, and can also cool the sunlight simulation device. Specifically, for example, a shutter with adjustable blade angle can be provided on the idle upper air outlet 13, and the blade angle of the shutter is adjusted to guide the airflow (wind) to the upper side in the same way as mentioned above. The air outlet guide vane 15 is installed on the air supply cabin 6 in a form protruding toward the automobile test space, and the blade angle can be adjusted. Specifically, when the air outlet guide vane 15 is installed, for example, the blade fixing angle can be determined by testing the air flow at different speeds to minimize the air pressure fluctuation of the center line of the test vehicle 5 and the most stable pressure gradient. In this embodiment, the air outlet guide vane 15 is three blades, but is not limited to this.

[0024] The return air unit is arranged at the rear side of the system body B, and includes a return air cabin 7, a return air duct 10 and a return air outlet guide vane 14. Specifically, the system body B has an opening at a position corresponding to the automobile test position on the rear side surface, and the return air cabin 7 is connected to the automobile test space in the system body B through the opening, and the return air outlet guide vane 14 is installed at the opening of the rear side surface of the system body B in the form of protruding toward the automobile test space, and the blade angle can be adjusted. Specifically, when the return air outlet guide vane 14 is installed, the blade fixing angle can be determined by testing the minimum air pressure fluctuation of the center line of the test vehicle 5 at different speeds of the air flow, and the most stable pressure gradient. In addition, in this embodiment, the return air outlet guide vane 14 is three blades, but it is not limited to this. In addition, in this embodiment, since the fixing angles of the return air outlet guide vane 14 and the outlet guide vane 15 are related to the vehicle size and the size of the internal space of the cabin, they cooperate with each other, so that the return air flow can have a certain guiding effect, which is further conducive to the stability of the air flow around the vehicle. The return air duct 10 is formed in a cylindrical shape, one end of which is connected to the return air compartment 7, and the other end is connected to the circulation unit described later, so that the return air unit and the circulation unit are connected. Figure 1 As shown, it is installed outside the system body B, but it can also be installed inside the system body B. In addition, in this embodiment, the return air cabin 7 can also serve as a vehicle entrance and exit. When the test vehicle 5 enters or exits, the front and rear walls of the return air cabin 7 can be opened to form a passage for the test vehicle 5 to enter or exit the system body B.

[0025] The circulation unit is arranged on the upper side of the system body B, and includes: a circulation fan 1, a cooling heat exchanger 3 and a heating heat exchanger 4. Specifically, the circulation fan 1 is installed in the circulation unit near the opening of the return air duct 10. In the present embodiment, the circulation fan 1 is preferably an axial flow fan, but is not limited to this. In some embodiments, the circulation unit may also adopt a fresh air system, an air conditioning system, etc. The heating heat exchanger 4 is installed in the circulation unit near the opening of the supply air duct 9. In the present embodiment, the heating heat exchanger 4 is preferably a plate heat exchanger, but is not limited to this. The cooling heat exchanger 3 is installed between the circulation fan 1 and the heating heat exchanger 4 in the circulation unit. In the present embodiment, the cooling heat exchanger 3 is preferably a plate heat exchanger, but is not limited to this. In addition, in the present embodiment, a sunlight simulation device is provided at the top of the system body B and below the circulation unit. In addition, in the present embodiment, the installation position and installation order of the circulation fan 1, the cooling heat exchanger 3 and the heating heat exchanger 4 are preferably as follows. Figure 1 The configuration is shown, but it can be adjusted appropriately according to the function. In the present embodiment, the cooling heat exchanger 3 and the heating heat exchanger 4 mainly play the functions of heating and cooling.

[0026] In this embodiment, when the airflow circulates, the airflow Figure 1In this embodiment, the circulation unit can be as follows Figure 1 As shown, it is installed outside the system body B, but it can also be installed inside the system body B. In addition, the air supply duct 9 and the air return duct 10 can be installed in different ways according to the installation positions of the air supply unit, the air return unit and the circulation unit, and can adopt structures known in the art, which are not particularly limited here.

[0027] The power generation recovery unit is arranged on the lower side of the system body B, and is mainly used to provide resistance during the driving process of the test vehicle 5, including a chassis dynamometer 8 and a transformer. Specifically, the chassis dynamometer 8 includes: a hub, a motor, a force measurement component, and a speed measurement component. The motor, the force measurement component, and the speed measurement component are respectively connected to the hub, and the motor provides power to the hub. In some test situations, the hub provides power / resistance for the test vehicle 5. In addition, in this embodiment, the power generation recovery unit is connected to the air supply unit and the power unit. Specifically, the chassis dynamometer 8 is electrically connected to the relay fan 2 via a transformer and the control unit described later, and the relay fan 2 receives power from the chassis dynamometer 8 for power supply. More specifically, when the car is at low speed / idling or initially started, the chassis dynamometer 8 receives power supply from the power unit and works (for motor resistance loading, etc.), and when the car is at high speed, its motor will generate additional power output due to the driving power of the car. In order to avoid power waste, in this embodiment, the power is transferred to the relay fan 2 for use. In other words, for example, when the vehicle speed is high, the chassis dynamometer 8 is equivalent to a generator and generates a large amount of electricity, which is supplied to the relay fan 2 through a transformer to provide the power required by the relay fan 2. Figure 1 It is shown as being installed outside the system body B, but it can certainly be installed inside the system body B.

[0028] The power unit is used to supply power to the entire system, and is connected to the air supply unit, the return air unit, the circulation unit and the control unit respectively. It can be an external power supply mechanism arranged outside the system, or it can be an internal power supply mechanism arranged inside and can be externally charged when necessary. For example, when the test vehicle 5 is an electric car, the power unit can be an external power supply system or a generator, or a rechargeable battery pack, etc. In addition, the power unit can also have both external power supply and internal power supply modes. In addition, in some embodiments, when the power generation recovery unit itself does not have a power structure, the power unit can also be connected to the power generation recovery unit.

[0029] The control unit is electrically connected to the air supply unit, the return air unit, the circulation unit, the power unit, and the power generation recovery unit, respectively, and is used to control the operation of the entire system, including a plurality of sensors (not shown). Specifically, in this embodiment, the control unit controls as follows: opening the wall of the return air cabin 7, after the operator places the test vehicle 5 in the system body B, controlling the cooling heat exchanger 3 and the heating heat exchanger 4 in the circulation unit to adjust the temperature in the system body B, controlling the chassis dynamometer 8 to simulate the vehicle's road driving resistance when the vehicle is driving, so that it meets the relevant test requirements, controlling the air supply unit, the return air unit, and the circulation unit to provide corresponding front wind following the vehicle speed, so as to simulate the front wind of the actual driving vehicle and provide vehicle heat dissipation, and at the same time, measuring specific indicators (such as temperature, etc.) in the semi-wind tunnel system through a plurality of sensors (such as temperature sensors, etc.) during the whole process for real-time monitoring, storage, and calculation, etc.

[0030] More specifically, the control unit controls as follows.

[0031] When the vehicle is traveling at high or medium speed, the front air supply port 11 on the partition wall 61 is opened, and the wall on one side of the return air cabin 7 is opened to connect the return air cabin 7 with the vehicle test space, so that inside the system, the airflow of the target temperature, humidity and wind speed is blown out through the air supply cabin 6, guided by the air outlet guide vane 15 and flows through the surface of the test vehicle 5, and then enters the return air duct 10 through the return air cabin 7, enters the circulation unit and contacts the cooling heat exchanger 3 and the heating heat exchanger 4, and then returns to the air supply cabin 6 through the air supply duct 9 and the relay fan 2. During the whole process, since the air supply cabin 6 and the return air cabin 7 are two empty cabins that are larger than the air duct, the high-speed circulating airflow decreases in speed after entering the two spaces, the static pressure increases, and the outlet airflow becomes more uniform (for example, the static pressure value at the air outlet is equal everywhere).

[0032] At this time, the circulating fan 1 and the relay fan 2 are made to work together and provide air circulation power at the same time, so as to simulate the airflow around the test vehicle 5 during the test process, and then ensure that the wind speed in front of the vehicle is maintained at the target value and the cabin environmental parameters are stable, that is, the temperature and humidity of the airflow can be kept stable during the circulation process. In addition, when the two work synchronously, the circulating fan 1 is the main one and the relay fan 2 is the auxiliary one. When the vehicle speed or environmental conditions change, the speed of the relay fan 2 is adjusted first to maintain the speed of the circulating fan 1, so that the energy consumption can be reduced while maintaining the stability of the environmental parameters and the airflow around the vehicle, that is, the airflow powered by the circulating fan 1 passes through the cooling heat exchanger 3 and the heating heat exchanger 4 in time, so that the outlet temperature and humidity are more stable. After the speed of the relay fan 2 is adjusted, the airflow speed will be reduced, but the corresponding temperature and humidity will not change or change slightly.

[0033] In addition, the air supply unit is supplied with power through the power recovery unit in priority, and a power unit is added when necessary. Specifically, the chassis dynamometer 8 has a large power generation capacity, and the relay fan 2 also requires a large power, so that the two can be matched, that is, supply and demand are balanced. Therefore, the power generation of the chassis dynamometer 8 is supplied to the relay fan 2 through a transformer, and then the power generation of the balanced chassis dynamometer 8, the actual power of the relay fan 2 and the external power supply are compared to make full use of the power generation of the field equipment to reduce the external power supply energy consumption and operating costs. Specifically, if the power generation of the chassis dynamometer 8 is consistent with or slightly larger than the actual power of the relay fan 2, the relay fan 2 can operate normally without external power input. If the power generation of the chassis dynamometer 8 is larger, the extra power can be converted into heat consumption, and if the power generation of the chassis dynamometer 8 is less than the actual power of the relay fan 2, the external part only needs to supplement the insufficient power.

[0034] When the vehicle is running at a low speed or idling, close the front air supply port 11 on the partition wall 61, open the wall on one side of the return air compartment 7 to connect the return air compartment 7 with the vehicle test space, and the circulating air flows out through the idle side air outlet 12 and the idle upper air outlet 13 arranged around the front air supply door 11, flows around the test vehicle 5, and passes through the return air compartment 7 for the next circulation. In this process, no airflow passes near and at the front of the test vehicle 5, thereby ensuring that the wind speed around the vehicle body is zero and the idling effect can be guaranteed, so that the vehicle idling environment can be better simulated, which is beneficial to the test effect of the front-end thermal management. Specifically, if Figure 3 As shown, after closing the front air supply vents 11, air flows from the front to the rear of the test vehicle 5 on both sides (as shown by the arrows). At this time, there is almost no airflow in the space around the test vehicle 5 (in the yellow area), but there is airflow flowing in the space slightly away from the test vehicle 5 (outside the yellow area). The impact of these airflows on the test vehicle 5 is minimal, but the stability of the airflow in the cabin can be maintained.

[0035] At this time, the circulation fan 1 is operated and the relay fan 2 is stopped. In other words, the temperature and humidity stability of the environmental chamber and the required minimum wind speed are maintained only by the circulation fan 1, which can reduce the overall energy consumption.

[0036] Furthermore, the air supply unit is preferably powered by the power unit.

[0037] The present invention also provides a control method based on the above-mentioned semi-wind tunnel system, comprising: Opening the return air unit to allow the vehicle to enter the system body; Controlling the circulation unit to adjust the system body until a specified test condition is reached; Controlling the power generation recovery unit to simulate vehicle road running resistance to meet relevant test requirements; and The air supply unit, the air return unit, and the circulation unit are controlled to provide corresponding front wind according to the vehicle speed to simulate the actual driving process, wherein: When the vehicle is traveling at a high or medium speed, the circulation unit and the air supply unit are made to work together, and the power generation recovery unit is made to supply power to the air supply unit and the circulation unit preferentially; When the vehicle is running at a low speed or idling, the circulation unit is operated and the relay fan is stopped, and the power unit supplies power to the circulation unit.

[0038] It can be seen that the semi-wind tunnel system according to the present invention adopts a circulating fan combined with a relay fan to circulate the airflow to adapt to the airflow stability of the test vehicle idle and high-speed tests. The front parking damper adopts a closable partition wall structure, which can ensure that the airflow around the vehicle is zero during low-speed and idle tests. In addition, during the test, the chassis dynamometer is used as a power generation device, which is associated with the relay fan power distribution system through a transformer, etc., to achieve power recovery and reuse, thereby reducing costs. Therefore, the semi-wind tunnel system for automobile test environment simulation according to the present invention avoids the shortcomings of the environmental simulation cabin and the thermal wind tunnel while combining the advantages of the two, and can achieve uniform temperature and humidity, stable airflow, low cost, and low energy consumption.

[0039] 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. A semi-wind tunnel system for simulating a vehicle test environment, characterized in that: It includes: a system body; and an air supply unit, an air return unit, a circulation unit, a power unit, a power generation recovery unit, and a control unit installed on the system body; wherein, The air supply unit is arranged at the front side of the system body corresponding to the vehicle test position, the return air unit is arranged at the rear side of the system body corresponding to the vehicle test position, the circulation unit is arranged at the upper side of the system body corresponding to the vehicle test position, and the power generation recovery unit is arranged at the lower side of the system body corresponding to the vehicle test position.

2. The semi-wind tunnel system according to claim 1, characterized in that: The control unit is used to control the operation of the entire system, and is connected to the air supply unit, the return air unit, the circulation unit, the power unit, and the power generation recovery unit, and performs the following control: Opening the return air unit to allow the vehicle to enter the system body; Controlling the circulation unit to adjust the system body until a specified test condition is reached; Controlling the power generation recovery unit to simulate the vehicle road running resistance to meet relevant test requirements; as well as The air supply unit, the air return unit, and the circulation unit are controlled to provide corresponding front wind according to the vehicle speed to simulate the actual driving process.

3. The semi-wind tunnel system according to claim 1, characterized in that: The air supply unit comprises: a relay fan, an air supply duct, an air supply cabin and a partition wall; wherein, The partition wall is located inside the system body and divides it into the air supply cabin and the vehicle test space. The air supply cabin is connected to the installation space of the relay fan. One end of the air supply duct is connected to the installation space of the relay fan, and the other end is connected to the circulation unit.

4. The semi-wind tunnel system according to claim 3, characterized in that: The partition wall includes: a front air supply port corresponding to the test vehicle; a plurality of idle side air outlets located on both sides of the front air supply port; a plurality of idle upper air outlets located above the front air supply port and the idle side air outlet; and an air outlet guide vane arranged near the front air supply port in a form protruding toward the vehicle test space.

5. The semi-wind tunnel system according to claim 4, characterized in that: The front air supply port is formed into an openable and closable structure, the idle side air outlet is arranged on both sides of the front air supply port and is formed into a slit shape, the idle upper air outlet is arranged on the upper side of the partition wall and is formed into a small window shape, and the air outlet guide blade is formed into a structure with an adjustable blade angle.

6. The semi-wind tunnel system according to claim 4, characterized in that: The control unit controls as follows: When the vehicle is traveling at high or medium speed, the front air supply port on the partition wall is opened, so that the circulation unit and the air supply unit work together, and the power generation recovery unit is preferentially used to supply power to the air supply unit and the circulation unit; When the vehicle is running at a low speed or idling, the front air supply port on the partition wall is closed, the circulation unit is operated and the relay fan is stopped, and the power unit supplies power to the circulation unit.

7. The semi-wind tunnel system according to claim 1, characterized in that: The return air unit includes a return air cabin, a return air duct and a return air outlet guide vane; wherein, The return air compartment is connected to the vehicle test space in the system body via an opening located at the rear side of the system body, one end of the return air duct is connected to the return air compartment, and the other end is connected to the circulation unit, and the return air outlet guide vane is installed near the opening on the rear side of the system body in a form protruding toward the vehicle test space.

8. The semi-wind tunnel system according to claim 1, characterized in that: The circulation unit includes: a circulation fan, a cooling heat exchanger and a heating heat exchanger; wherein, The circulation fan is installed in the circulation unit on a side close to the return air unit, the heating heat exchanger is installed in the circulation unit on a side close to the air supply unit, and the cooling heat exchanger is installed in the circulation unit between the circulation fan and the heating heat exchanger.

9. The semi-wind tunnel system according to claim 1, characterized in that: The power generation recovery unit is connected to the air supply unit, the power unit, and the control unit, and includes a chassis dynamometer and a transformer; wherein: The chassis dynamometer receives power from the power unit to provide running resistance when the vehicle is running at a low speed or idling, and receives running power from the vehicle to generate electricity when the vehicle is running at a high speed, thereby supplying power to the air supply unit via the transformer.

10. A control method for a half wind tunnel system according to any one of claims 1 to 9, characterized in that: include: Opening the return air unit to allow the vehicle to enter the system body; Controlling the circulation unit to adjust the system body until a specified test condition is reached; Controlling the power generation recovery unit to simulate the vehicle road running resistance to meet relevant test requirements; as well as The air supply unit, the air return unit, and the circulation unit are controlled to provide corresponding front wind according to the vehicle speed to simulate the actual driving process, wherein: When the vehicle is traveling at a high or medium speed, the circulation unit and the air supply unit are made to work together, and the power generation recovery unit is made to supply power to the air supply unit and the circulation unit preferentially; When the vehicle is running at a low speed or idling, the circulation unit is operated and the relay fan is stopped, and the power unit supplies power to the circulation unit.

Images