Multifunctional steering system of chassis dynamometer for whole vehicle test in anechoic chamber and anechoic chamber

Abstract

The invention relates to a multifunctional steering system of a chassis dynamometer for whole vehicle testing in an anechoic chamber and the anechoic chamber, and belongs to the technical field. The steering system capable of driving the whole dynamometer to rotate is formed by constructing the overall rotation mechanism and the center mechanism in the basement, rotation of the hub shaft system around the center within the range of 360 degrees can be achieved, and meanwhile tail gas collection and cooling of tires and grids can be achieved. The bottleneck that large-range rotation of the hub assembly cannot be achieved in the current industry is broken through, and then the steering angle of front wheels or rear wheels of a vehicle can be simulated, the relative movement of tires and the ground during vehicle steering can be simulated, and sufficient and repeatable EMC testing and verification can be conducted on steering-related ADAS functions of an intelligent networked automobile.

Description

Technical Field

[0001] This invention relates to a multi-functional steering system for a chassis dynamometer and an anechoic chamber for testing the electromagnetic radiation and electromagnetic interference of a vehicle in an anechoic chamber, belonging to the technical field of testing the electromagnetic radiation and electromagnetic interference of a vehicle in an anechoic chamber. Background Technology As the automotive industry evolves towards new energy and intelligent connectivity, the electromagnetic environment of vehicles is becoming increasingly complex. Advanced Driver Assistance Systems (ADAS) and future Level 3 / 4 autonomous driving functions rely on a large number of electronic devices such as cameras, radars (millimeter-wave radar, lidar), and ultrasonic sensors. Whether these devices can operate stably and reliably in complex electromagnetic environments is directly related to driving safety, thus placing unprecedentedly higher demands on EMC testing.

[0002] Currently, the industry's cutting-edge R&D focus has shifted from basic EMC testing to verification methods that support higher frequency bands, greater intelligence, and closer resemblance to real-world driving scenarios. One important trend is the development of integrated hardware-in-the-loop (HIL) testing environments within anechoic chambers (EMC chambers). These environments integrate equipment such as dynamometers, rotating drums, remotely controlled dummies, and radar target simulators to simulate real-world road scenarios. During this process, the vehicle's ADAS functions are activated, and EMC testing is performed to evaluate the performance of intelligent driving systems under electromagnetic interference.

[0003] However, existing technologies face a key bottleneck: all dynamometers and rotary testing equipment currently available for vehicle EMC testing can only simulate straight-line driving. In real-world driving scenarios, many ADAS functions (such as lane keeping assist, automatic lane changing, cornering cruise control, and obstacle avoidance) can only be fully activated and tested when the vehicle is turning. For example, testing whether a vehicle's side radar is interfered with by electromagnetic noise generated by the electric motor drive system when turning cannot be effectively performed on existing straight-line testing benches.

[0004] Currently, the verification of these advanced functions mainly relies on real-vehicle road testing. However, real-vehicle testing has inherent drawbacks, such as huge investment, long cycle, uncontrollable test scenarios, and difficulty in reproducibility. For intelligent connected vehicles that integrate dozens or even hundreds of sensing and processing units, it is almost unrealistic to complete the functional and EMC verification under all complex operating conditions solely through road testing.

[0005] Therefore, there is an urgent need in this field for a steering system that can be used in an anechoic chamber environment to simulate vehicle steering conditions on a chassis dynamometer, thereby enabling the activation and testing of vehicle ADAS functions in the laboratory, and the testing of EMC / EMI functions of various vehicle systems under complex driving conditions. This will accelerate the rapid development of future vehicles in the fields of "electrification" and "intelligent driving". Summary of the Invention

[0006] To address the aforementioned problems, in a first aspect, the present invention provides a multi-functional steering system for a chassis dynamometer used in an anechoic chamber for whole-vehicle testing, comprising: The overall slewing mechanism includes a circular track set on the concrete foundation of the basement. At least one active walking wheel device and multiple driven walking wheel devices are movably fitted on the circular track. The top of the active walking wheel device and the driven walking wheel device are connected to the wheel hub shaft system and the slewing table. Driven by the active walking wheel device, it moves along the circular track together with the driven walking wheel device, and carries the wheel hub shaft system and the turntable to rotate as a whole; The wheel hub axle system includes multiple wheel hub support modules mounted on a chassis. Each wheel hub support module includes a front axle steering system mounted on the wheel hub frame at the corresponding position below the front wheel of the vehicle, and a wheel hub drive system connecting each wheel hub. The front axle steering system includes a ring gear mounted at the bottom of the wheel hub support frame, which meshes with a drive pinion. The wheel hub drive assembly is a belt drive mechanism connecting the wheel hub. By driving the ring gear with the drive pinion, the wheel hub support frame is rotated, thereby enabling the entire wheel hub support module to drive the wheel hub to rotate independently relative to the turntable. The central mechanism includes a central slewing support base fixed to the concrete foundation of the basement, and a central slewing bearing and a slewing drag chain disposed on the central slewing support base. The central slewing bearing is connected to the hub shaft system. The exhaust gas system consists of a central exhaust gas tank located within the central structure and connected to the vehicle's exhaust port on the turntable, as well as an underground exhaust fan connected to the central exhaust gas tank.

[0007] Furthermore, the active walking wheel device includes an active walking wheel frame connected to the rotary table, with an active walking wheel fitted at the bottom of the active walking wheel frame, and the active walking wheel connected to an active walking motor; the driven walking wheel device includes a driven walking wheel frame connected to the rotary table, with a driven walking wheel fitted at the bottom of the driven walking wheel frame.

[0008] Furthermore, the annular track is a track structure with wheel grooves and is coaxially arranged with the rotary table.

[0009] Furthermore, two hard limiting mechanisms are arranged opposite each other on the circular track to limit the movement of the active walking wheel device along the circular track to no more than 180 degrees.

[0010] Furthermore, the hard limiting mechanism is a stop block fixed on the circular track.

[0011] Furthermore, multiple cooling fans are installed at the bottom of the turntable corresponding to the tire position.

[0012] Secondly, the present invention provides an anechoic chamber, comprising a laboratory and a basement located at the bottom of the laboratory. The basement is provided with a power amplifier room and a pit shielding room installed on the concrete foundation of the basement. The multi-functional steering system is installed in the pit shielding room. The bottom of the laboratory includes a darkroom floor and a rotary table set in the middle of the darkroom floor. Multiple parallel wheel assemblies are set on the rotary table, and the bottom of each wheel assembly is connected to a wheel rotation mechanism set in the pit shielding room.

[0013] Furthermore, the edge of the turntable is provided with a front air vent and an exhaust gas collection port. The front air vent is connected to a first cooling fan, and the exhaust gas collection port is provided with an exhaust gas collection pipe connected to the vehicle's exhaust outlet. At the same time, the exhaust gas collection pipe is also connected to a central exhaust gas tank.

[0014] Furthermore, the bottom of the darkroom floor is connected to the basement concrete foundation via darkroom support legs.

[0015] Furthermore, the turntable is also provided with cooling air ducts on both sides of the car tires, and the cooling air ducts are connected to a second cooling fan.

[0016] The beneficial effects of this invention are: This invention addresses two key issues. First, by constructing an integrated rotary mechanism and a central mechanism within a basement, it creates a steering system capable of driving the entire dynamometer to rotate. This system enables the wheel hub axle system to rotate within a 360-degree range around the center, while simultaneously collecting exhaust gases and cooling the tires and grille. Second, by implementing a front axle steering system, the wheel hubs (including but not limited to those in contact with the front wheels) can rotate independently relative to the turntable. This overcomes the current industry limitation of conducting EMC / EMI testing related to vehicle and steering functions in anechoic chamber environments. The device allows for steering on either the front or rear axle, breaking through the bottleneck of large-range rotation (steering angle ±50 degrees) of the wheel hub axle system. Consequently, it enables the simulation of the steering angle of the front or rear wheels, the simulation of the relative motion between the tires and the ground during vehicle steering, and the comprehensive and repeatable EMC testing and verification of steering-related ADAS functions in intelligent connected vehicles.

[0017] This invention is the first to achieve EMC or EMI functional testing under dual operating conditions of overall vehicle steering and simultaneous independent steering of the front or rear axle of the vehicle in the laboratory. It can comprehensively cover the ADAS function verification needs of intelligent connected vehicles in real-world scenarios such as curves, ramps, and roundabouts, achieving comprehensive testing scenarios. At the same time, it revolutionarily improves testing efficiency by transferring a large number of steering-related ADAS road tests that originally had to be conducted outdoors and were not repeatable to a controlled and repeatable laboratory environment, which greatly shortens the R&D cycle and reduces testing costs and safety risks.

[0018] Furthermore, the present invention has the following significant advantages: • Comprehensive breakthroughs in testing capabilities: For the first time, an anechoic chamber testing environment is used to simulate variable wheelbase and front axle steering conditions, facilitating testing of higher-level autonomous driving functions for future I35 systems, and integrating vehicle-in-the-loop (VI) testing environments. This evaluates the performance of intelligent driving systems equipped with numerous cameras, radars (millimeter-wave radar, lidar), ultrasonic sensors, and other electronic devices in complex electromagnetic interference environments.

[0019] • Revolutionary improvement in testing efficiency: Transferring a large number of real vehicle road tests that must be conducted outdoors, are non-repeatable or impossible to conduct, to a controlled and repeatable laboratory environment, greatly shortening the R&D cycle and reducing testing costs and safety risks.

[0020] Future-oriented technological vision: This device provides an essential verification tool for the complex and demanding EMC testing requirements of I3L5 and above autonomous vehicles, filling a key gap in the industry and possessing significant strategic importance and market prospects. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of a multi-functional steering system according to one embodiment of the present invention.

[0022] Figure 2 This is a front perspective view of a multi-functional steering system according to one embodiment of the present invention.

[0023] Figure 3 for Figure 2 A magnified view of a portion of the image.

[0024] Figure 4 This is a top view showing the layout of the overall rotating mechanism, the central mechanism, and the exhaust emission mechanism in one embodiment of the present invention.

[0025] Figure 5 This is a double-layer layout diagram of an anechoic chamber in one embodiment of the present invention.

[0026] Figure 6This is a double-layer perspective view of an anechoic chamber according to one embodiment of the present invention.

[0027] Figure 7 This is a schematic diagram of the hub support module in one embodiment of the present invention.

[0028] In the diagram, 100 is the concrete foundation; 200 is the basement; 201 is the amplifier room; 202 is the pit shielded room; 300 is the laboratory; 301 is the laboratory floor; 1 is the rotary table; 2 is the hub shaft system; 3 is the central mechanism; 31 is the central rotary support base; 32 is the central rotary bearing; 33 is the rotary drag chain; 34 is the hard limit mechanism; 41 is the circular track; 42 is the active walking wheel device; 43 is the driven walking wheel device; 5 is the central exhaust gas tank; 6 is the front air vent; 7 is the cooling air duct; 8 is the darkroom support leg; 9 is the exhaust gas collection pipe; 91 is the exhaust gas extraction pipe; 21 is the hub support module; 211 is the hub support frame; 212 is the ring gear; 213 is the drive pinion; 214 is the hub drive wheel; 215 is the hub pulley; 216 is the intermediate gear; and 217 is the synchronous belt. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] In this invention, the terms "first" and "second" are used only to distinguish similar components / parts in different positions or with different characteristics, and have no other limiting meaning; "upper" refers to the direction in which each component is away from the ground, and "lower" refers to the direction in which each component is away from the ground.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] This invention provides a multi-functional steering system for a chassis dynamometer used in an anechoic chamber for whole-vehicle testing. It mainly includes an integral slewing mechanism, a central mechanism 3, and an exhaust emission system, capable of simulating the driving load and steering actions of a vehicle on a real road. The anechoic chamber refers to an EMC anechoic chamber, and the multi-functional steering system provided by this invention can be used to construct an intelligent connected vehicle EMC and ADAS hardware-in-the-loop testing platform.

[0034] In some embodiments, the overall slewing mechanism includes a circular track 41 mounted on a concrete foundation 100 of the basement 200. At least one active traveling wheel device 42 and multiple driven traveling wheel devices 43 are movably fitted on the circular track 41. The tops of both the active and driven traveling wheel devices 42 and 43 are connected to the wheel hub axle system 2 and the turntable 1. The wheel hub axle system 2 includes a wheel hub assembly exposed on the surface of the turntable 1 that contacts the vehicle tires, and a wheel hub drive assembly located at the bottom of the wheel hub assembly below the turntable 1. In this invention, a chassis dynamometer with multi-axle wheel hub assemblies can be applied, without limiting the number of axles in the wheel hub assembly, thus enabling whole-vehicle steering simulation testing for various vehicle models.

[0035] In the example in Figure 2, the top of the active walking wheel device 42 and the driven walking wheel device 43 are first connected to the hub shaft system 2 through the base frame with slide rails. The hub shaft system 2 can move horizontally along the slide rails. Then the top of the hub shaft system 2 is connected to the turntable 1. Therefore, the hub shaft system 2 and the turntable 1 can rotate together, that is, the whole dynamometer achieves rotation.

[0036] In the examples shown in Figures 1-4, the active walking wheel device 42 includes an active walking wheel frame connected to the rotary table 1, with an active walking wheel fitted at the bottom of the frame, and the active walking wheel connected to an active walking motor; the driven walking wheel device 43 includes a driven walking wheel frame connected to the rotary table 1, with a driven walking wheel fitted at the bottom of the frame. Further, the annular track 41 is a track structure with wheel grooves and is coaxially arranged with the rotary table 1, ensuring that the rotary table 1 rotates around its center.

[0037] In some embodiments, the active walking motor drives the active walking wheels to walk along the circular track 41, and then the active walking wheel device 42 drives and drives the driven walking wheel device 43 to walk along the circular track 41 together, and carries the wheel hub shaft system 2 and the turntable 1 to rotate as a whole; preferably, the active walking wheel device 42 is configured as four pieces.

[0038] Furthermore, two hard limiting mechanisms 34 are provided on opposite sides of the annular track 41 to limit the movement of the active walking wheel device 42 along the annular track 41 to no more than 180 degrees. That is, the hub shaft system 2 and the turntable 1 can only rotate a maximum of 180 degrees in any rotational direction; when they reach 180 degrees, they are blocked by the hard limiting mechanisms 34 to limit their travel. Since the maximum travel for both clockwise and counterclockwise rotation is 180 degrees, this effectively covers a full 360-degree rotation range.

[0039] In the examples shown in Figures 1-4, the hard limiting mechanism 34 is a stop fixed on the annular track 41, and the stop can be made of a hard material to provide safety protection.

[0040] In some embodiments, the central mechanism 3 includes a central slewing support base 31 fixed to the concrete foundation 100 of the basement 200 and a central slewing bearing 32 disposed on the central slewing support base 31, the central slewing bearing 32 being connected to the hub shaft system 2. In the examples of Figures 1-4, the central slewing support base 31 is a cylindrical structure, and the central slewing bearing 32 includes a fixed ring fixed to the upper part of the central slewing support base 31 and a moving ring mating to the upper part of the fixed ring. This arrangement further ensures that the entire dynamometer rotates strictly around the central axis of the central slewing support base 31 and the central slewing bearing 32, while the central slewing support base 31 remains stationary. In addition, a rotary drag chain 33 is arranged in a ring inside the central rotary support. The rotary drag chain 33 is connected to each motor below the rotary table 1. Since the central rotary support is fixed, the rotary drag chain 33 will rotate coaxially with the hub shaft system 2 and the rotary table 1 inside the central rotary support.

[0041] In some embodiments, the exhaust gas emission system is located within the central mechanism 3 and connected to a central exhaust gas tank 5 on the turntable 1, which is connected to the vehicle's exhaust port, and an underground exhaust fan connected to the central exhaust gas tank 5. To prevent the exhaust gas collection from moving with the rotation of the overall turntable mechanism and causing inconvenience, a central exhaust gas tank 5 is provided within the central rotary support in this invention. The central exhaust gas tank 5 can be connected to the exhaust gas collection pipe 9 on the turntable 1 to collect the exhaust gas. After collection, the exhaust gas can be drawn away by the underground exhaust fan through the exhaust gas extraction pipe 91.

[0042] In some embodiments, the wheel hub system includes multiple wheel hub support modules 21 mounted on a chassis. Each wheel hub support module 21 includes a front axle steering system mounted on a wheel hub support frame 211 at the corresponding position below the front wheel of the vehicle, and a wheel hub drive system connecting each wheel hub. The front axle steering system can independently drive the corresponding wheel hub to rotate ±90 degrees relative to the turntable and is located at the bottom of the wheel hub support frame 211. Therefore, it can be installed at the bottom of the wheel hub support frame 211 of any wheel hub, meaning it can also be installed at the bottom of the rear wheel support frame 211 to drive the rear wheel hub to rotate independently. The wheel hub drive system is mainly used to drive the wheel hub to rotate, including but not limited to driving one or more wheel hubs.

[0043] In the example of Figure 7, the front axle steering system includes a ring gear 212 disposed at the bottom of the hub support frame 211, the ring gear 212 meshing with a drive pinion 213; the ring gear 212 is driven by the motor to rotate the hub support frame 211, thereby causing the entire hub support module 21 to drive the hub to rotate independently relative to the turntable.

[0044] In the example of Figure 7, the hub drive assembly is a belt drive mechanism connecting the hub, including a hub drive wheel 214 disposed on the hub support frame 211 and a hub pulley 215 connected to the hub shaft. The motor drives the hub drive wheel 214 and connects the hub pulley 215 for transmission via a timing belt 217. In some embodiments, the hub drive assembly can drive one or more hubs, all of which can be connected via the timing belt 217. For example, Figure 6 drives only one hub, while Figure 7 drives two hubs, where a gear 216 can be added.

[0045] In some embodiments, the motors involved in the hub shaft system are all electrically shielded.

[0046] Example 1 This invention provides an anechoic chamber, as shown in Figures 5 and 6, which is a two-layer structure including a laboratory 300 and a basement 200 located at the bottom of the laboratory 300. The basement 200 houses an amplifier room 201 and a pit-shielded room 202, both mounted on a concrete foundation 100 of the basement 200. The aforementioned multi-functional steering system is installed in the pit-shielded room 202. The pit-shielded room 202 and the laboratory 300 effectively shield electromagnetic waves from the external environment (such as radio and mobile phone signals), ensuring that test results are generated solely by the vehicle under test, thus guaranteeing the accuracy and repeatability of the data. The wave-absorbing material on the inner wall of the laboratory 300 absorbs electromagnetic waves emitted by the vehicle and testing equipment, preventing reflected waves from interfering with the measurement and simulating the ideal conditions of "free space." In some embodiments, the bottom of the laboratory 300 includes a darkroom floor 301 and a rotary table 1 disposed in the middle of the darkroom floor 301. The rotary table 1 is provided with a plurality of parallel hub assemblies 2 (for example, three hub assemblies 2 are shown in Figure 1, while two hub assemblies 2 are shown in Figure 5. The number of hub assemblies 2 is not limited, and any number of hub assemblies 2 does not affect the overall rotation of the present invention). The bottom of each hub assembly 2 is connected to a hub rotation mechanism disposed in the pit shielding room 202, and the hub rotation mechanism is used for rotation. In some embodiments, the turntable 1 has a front air vent 6 and an exhaust gas collection port on its edge. The front air vent 6 is connected to a first cooling fan, and the exhaust gas collection port is equipped with an exhaust gas collection pipe 9 connected to the vehicle's exhaust outlet. The exhaust gas collection pipe 9 is also connected to a central exhaust gas tank 5. In some embodiments, multiple second cooling fans are provided at the bottom of the turntable 1 corresponding to the tire positions. The turntable 1 also has cooling air ducts 7 on both sides of the vehicle tires, and these cooling air ducts 7 are connected to the second cooling fans. The front air vent 6 is used to cool the front grille, and the cooling air ducts 7 can be connected to cooling spray pipes to cool the tires on the sides. In some embodiments, the bottom of the darkroom floor 301 is connected to the concrete foundation 100 of the basement 200 via darkroom support legs 8, which can stabilize the darkroom floor 301 and improve its load-bearing capacity. During vehicle testing, a specific deflection angle can be arbitrarily set according to testing requirements to simulate whether the vehicle's various functions are normal when the vehicle is exposed to radiation at any position within 360 degrees. Darkroom testing also includes: Locating the source of radiation: In EMI testing, by slowly rotating the vehicle in conjunction with the overall slewing mechanism and the central mechanism 3, and with the help of the measuring antenna, the main emitting parts of electromagnetic interference (such as motor controllers, DC-DC converters, on-board chargers, etc.) can be accurately located. Comprehensive testing: Ensure that the electromagnetic radiation emission of the vehicle is fully measured from all directions to find the point of maximum radiation and meet the standard testing requirements.

[0047] Example 2 This invention can simulate the driving load and steering actions of a vehicle on a real road.

[0048] •Core function: o Simulates real-world operating conditions: Provides the vehicle with realistic driving resistance (such as wind resistance and rolling resistance) and enables the drive wheels to rotate, thereby activating the vehicle's high-voltage system, drive system, and other high-power components, putting them into working condition.

[0049] o Steering-related functions can be activated by simulating steering: ADAS functions that depend on steering state, such as lane keeping assist (LKA), automatic emergency steering (AES), and intersection assist, can be activated.

[0050] o Constructing dynamic test scenarios: This makes it possible to conduct EMC tests in a dark room for complex scenarios such as "radar interference during curve cruise" or "camera failure during steering obstacle avoidance," achieving deep integration of hardware-in-the-loop (HIL) testing and EMC testing.

[0051] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A multi-functional steering system for a chassis dynamometer used for whole vehicle testing in an anechoic chamber, characterized by, The utility model relates to a kind of integrated rotary mechanism, including the annular track being arranged on basement concrete foundation, at least one active walking wheel device and multiple driven walking wheel devices are movably matched on the annular track, the top of the active walking wheel device and driven walking wheel device is connected with wheel hub shafting system and rotary table; It is driven by active walking wheel device and drives driven walking wheel device to walk along annular track, and carries the wheel hub shafting system and rotary table to carry out integrated rotation; The wheel hub shafting system includes multiple wheel hub support modules arranged on the chassis, each wheel hub support module includes a front axle steering system arranged at the corresponding automobile front wheel hub position on the wheel hub support frame and a wheel hub drive system connected to each wheel hub; The front axle steering system includes an annular gear arranged at the bottom of the wheel hub support frame, and the annular gear is engaged with a driving pinion gear;The wheel hub drive assembly is a belt drive mechanism connected to the wheel hub. The annular gear is driven by the driving pinion gear to rotate the wheel hub support frame, so that the entire wheel hub support module drives the wheel hub to rotate independently relative to the rotary table; The central mechanism includes a central rotary support base fixed to the basement concrete foundation, a central rotary bearing arranged on the central rotary support base and a rotary tow chain arranged on the central rotary support base, and the central rotary bearing is connected to the wheel hub shafting system. The tail gas discharge system includes a central tail gas tank arranged in the central mechanism and connected to the automobile exhaust port on the rotary table, and an underground air extractor connected to the central tail gas tank. The active walking wheel device includes an active walking wheel frame connected to the rotary table, and an active walking wheel is matched at the bottom of the active walking wheel frame, and the active walking wheel is connected to an active walking motor.

2. The multi-functional steering system of claim 1, wherein The driven walking wheel device includes a driven walking wheel frame connected to the rotary table, and a driven walking wheel is matched at the bottom of the driven walking wheel frame.

3. The multi-functional steering system of claim 2, wherein, The annular track is a track structure with wheel grooves and is coaxially arranged with the rotary table.

4. The multi-functional steering system of claim 1, wherein Two hard limit mechanisms are arranged opposite to each other on the annular track to limit the movement of the active walking wheel device along the annular track to no more than 180 degrees.

5. The multi-functional steering system of claim 4, wherein, The hard limit mechanism is a stopper fixed on the annular track.

6. The multi-functional steering system of claim 1, wherein A plurality of cooling fans are arranged at the positions corresponding to the tires at the bottom of the rotary table.

7. An anechoic chamber comprising a laboratory and a basement provided at the bottom of the laboratory, characterized in that, The basement is provided with a power amplifier room and a pit shielding room installed on the basement concrete foundation, and the pit shielding room is provided with the multifunctional steering system according to any one of claims 1-6. The bottom of the laboratory includes a darkroom floor and a rotary table arranged in the middle of the darkroom floor, and a plurality of wheel hub assemblies are arranged in parallel on the rotary table, and the bottom of each wheel hub assembly is connected to a wheel hub rotary mechanism arranged in the pit shielding room.

8. The anechoic chamber according to claim 7, characterized in that The edge of the rotary table is provided with a front air outlet and a tail gas collection port, the front air outlet is connected to a first cooling fan, and the tail gas collection port is provided with a tail gas collection pipe connected to the automobile exhaust port.

9. The anechoic chamber according to claim 7, characterized in that The bottom of the darkroom floor is connected to the basement concrete foundation through darkroom support legs.

10. The anechoic chamber according to claim 7, characterized in that The rotary table is also provided with cooling air pipe outlets on both sides of the automobile tires, and the cooling air pipe outlets are connected to a second cooling fan.

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