Four-wheel drive four-motor bench whole vehicle environment cabin and control system thereof

Abstract

The application relates to a four-wheel-drive four-motor bench whole vehicle environment cabin which comprises a cabin body, a fresh air unit is arranged at one end of the outer top surface of the cabin body and is communicated with the inside of the cabin body through an air inlet pipe matched with the fresh air unit; an air treatment box is arranged at the other end of the outer top surface of the cabin body, an air outlet of the air treatment box is communicated with a fan box arranged at the upper front part of the cabin body in series through a pipeline, air inlets of the air treatment box are respectively communicated with two air guide ducts arranged at the lower rear part of the cabin body in parallel through pipelines, and exhaust fans are arranged on the parallel pipelines on the outer top surface of the cabin body; a head-on fan is arranged on the bottom surface of the front part of the cabin body along a long axis, and the head-on fan is supported through a lifting support matched with the head-on fan; and a full-spectrum irradiation system with adjustable illumination angle is suspended on the top surface of the cabin body. The application realizes high-precision temperature field uniformity, solves the temperature and humidity stratification problem of traditional equipment, supports inclination angle adjustment, cooperates with full-spectrum coverage, and simulates a real sunlight environment.

Description

Technical Field

[0001] This invention belongs to the field of automotive environmental testing chamber technology, and specifically relates to a four-wheel drive four-motor test bench for a whole vehicle environmental chamber and its control system. Background Technology

[0002] Currently, the new energy four-wheel drive four-motor vehicle environmental test bench is an advanced experimental device specifically designed for testing and optimizing the thermal management system of new energy vehicles (especially electric vehicles driven by four in-wheel motors). Its core function is to verify the reliability, efficiency, and adaptability of the vehicle's thermal management system by simulating extreme environmental conditions and complex operating scenarios. It supports whole-vehicle testing driven by four in-wheel motors, simulating complex operating conditions of independent four-wheel drive (such as high-performance electric vehicles, off-road vehicles, or special vehicles), and evaluating the temperature rise and heat dissipation performance of the in-wheel motors under high loads, frequent start-stop cycles, or extreme torque.

[0003] However, existing environmental test chambers typically cannot complete air handling and circulation within the chamber during four-motor driven vehicle testing, making it impossible to control the temperature and humidity inside. Furthermore, conventional full-spectrum irradiation systems suffer from limited angle adjustment, making it difficult to simulate the impact of real-world sunlight on vehicle thermal management. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a four-wheel drive, four-motor test bench vehicle environmental chamber and its control system. The specific technical solution is as follows:

[0005] This invention provides a four-wheel drive, four-motor vehicle environmental chamber, including a chamber body with an openable door on one end. Two pairs of testing machines are embedded in a rectangular arrangement on the inner bottom surface. A fresh air unit is installed at one end of the outer top surface of the chamber, and this fresh air unit is connected to the interior of the chamber via a compatible air inlet pipe. An air handling unit is installed at the other end of the outer top surface. The air outlet of the air handling unit is connected in series with a blower box located at the upper front of the chamber body via a pipe. Its air inlet is connected in parallel with guide air ducts located on both sides of the lower rear of the chamber body via pipes. Exhaust fans are connected to the parallel pipes on the outer top surface of the chamber body. A frontal fan is installed along the long axis of the bottom front surface of the chamber body, and this frontal fan is supported by a compatible lifting bracket. A full-spectrum irradiation system with adjustable illumination angle is suspended on the upper top surface of the chamber body.

[0006] As a preferred embodiment of the present invention, the full-spectrum irradiation system includes multiple suspension rods, which are connected in a crisscross pattern to form a rectangular grid, and each intersection point has a vertically connected rod fixed to the top surface of the cabin. Multiple full-spectrum lamps are suspended in a straight line at equal intervals directly below the suspension rods along the long side, and the upper part of the housing end face of each full-spectrum lamp is pivotally connected to a hanger with an inverted U-shaped structure that is vertically fixed to the bottom surface of the corresponding suspension rod. Multiple full-spectrum lamps located below the same suspension rod are synchronously positioned and rotated left and right within an acute angle range through an angle adjustment mechanism set on the top surface of the suspension rod.

[0007] As a preferred embodiment of the present invention, the angle adjustment mechanism includes a long rotating shaft that rotates vertically through multiple suspension rods on corresponding suspension rods. One end of the long rotating shaft is rotatably connected to a bearing seat, and the other end is axially connected to a servo motor. The upper part of the side surface of the full-spectrum lamp housing is vertically and symmetrically fixed with lugs, and a long connecting rod is fixedly connected between multiple lugs on the same side. The ends of the long rotating shaft are respectively axially fixed with transmission gears that are in the same vertical plane as the lugs at the head and tail. An open-type transmission rack is meshed on the transmission gear, and a tongue is connected to the end of the transmission rack. The bottom end of the tongue is pivotally connected to a U-shaped tongue seat fixed to the outer side of the top surface of the corresponding lug. A U-shaped limiting frame is invertedly fastened to the outer side of the transmission gear, and the two sides of the limiting frame are rotatably connected to the long rotating shaft.

[0008] As a preferred technical solution of the present invention, each of the four test machines is provided with an L-shaped cover plate of a size that is adapted to the short side of the cabin. Each cover plate has a directional fire extinguishing mechanism for automatically extinguishing the corresponding hub motor of the test vehicle on the test machine along its centerline on the top surface of the horizontal part.

[0009] The directional fire extinguishing mechanism includes a fixed support component disposed on the top surface of the horizontal part of the corresponding cover plate. The fixed support component is equipped with a fire extinguishing component containing a fire extinguishing agent, which is in a liquid state at room temperature. The fire extinguishing component automatically activates by sensing the flame temperature through a temperature control component that extends forward and is disposed on the top surface of the vertical part of the cover plate, and sprays the fire extinguishing agent through the vertical part of the cover plate.

[0010] As a preferred embodiment of the present invention, the fire extinguishing assembly includes a cylinder horizontally fixed to the top of a fixed support assembly. The cylinder is a non-pressurized circular structure, open at one end and closed at the other. A nozzle is vertically connected to the center of the closed end, and a diaphragm is sealed to the inner port of the nozzle. The nozzle gap passes through an elongated hole longitudinally opened along the centerline of the vertical portion of the cover plate. The cylinder is divided into two chambers by a partition axially arranged in its middle. A pressure airbag is axially sealed to the vertical surface of the partition in the front chamber, and a pressure airbag is axially sealed to the vertical surface of the partition in the rear chamber. The cylinder is fitted with a storage airbag, which is connected to the push airbag via a through hole axially opened in the middle of the partition. The front chamber of the cylinder is filled with the extinguishing agent through a filling port opened at the top of the cylinder. An electric push rod with a series rechargeable battery is axially suspended in the middle of the rear chamber port. The electric push rod is fixedly engaged with a cross-shaped device fixed to the opening end of the cylinder. A piston plate is axially connected to the outer end face of the storage airbag, and the piston plate is axially slidably attached to the inner wall of the cylinder. The power output end of the electric push rod is perpendicularly connected to the piston plate.

[0011] As a preferred embodiment of the present invention, the temperature control component includes an insulating rigid tube horizontally fixed to the middle of the top surface of the vertical part of the corresponding cover plate. The rear end of the insulating rigid tube is axially connected to a socket. The inner surface of the socket has radially symmetrically opened insertion holes. Two insertion holes are respectively connected in series with the electric push rod and its rechargeable battery through compatible wires. The front end of the insulating rigid tube is axially connected to a temperature sensing cylinder, and the front end of the temperature sensing cylinder is close to the corresponding wheel hub of the test vehicle. The front end of the temperature sensing cylinder is axially connected to a heat-elongated shape memory alloy spring. The rear end of the shape memory alloy spring is axially connected to an insulating circular plate. An insulating guide rod is inserted through the axial gap in the insulating circular plate. One end of the insulating guide rod is connected to the inner surface of the socket, and the other end is connected to the front end of the temperature sensing cylinder. A U-shaped conductive sheet is fixedly attached to the front end of the insulating circular plate. The ends of the conductive sheet are radially and vertically symmetrically connected to guide pins. The guide pins can be inserted into the corresponding insertion holes of the socket to connect the power supply circuit of the electric push rod.

[0012] As a preferred embodiment of the present invention, the fixed support assembly includes a horizontally arranged support platform. Guide rods are vertically and symmetrically inserted at the four corners of the support platform, and the bottom ends of the guide rods are fixedly connected to the top surface of the horizontal portion of the corresponding cover plate. A support spring is axially sleeved on the guide rod, the bottom end of the support spring is connected to the cover plate, and its top end is connected to the support platform. A U-shaped seat is vertically connected to the middle of the bottom surface of the support platform. A support screw is inserted through the middle of the U-shaped seat, and the bottom end of the support screw is fixedly connected to the top surface of the horizontal portion of the cover plate. The U-shaped seat is clamped and connected by two positioning nuts axially screwed to the support screw. The cylinder of the fire extinguishing assembly is horizontally fixedly connected to the top surface of the support platform.

[0013] As a preferred embodiment of the present invention, an arc-shaped groove is formed through the center of the top surface of the support platform, and the lower part of the cylinder is engaged with the arc-shaped groove; an "Ω"-shaped clamp is radially engaged with the upper part of the cylinder, and the bottom end of the clamp is fixed to the support platform by bolts; an L-shaped claw is radially and vertically symmetrically connected to the rear end face of the clamp, the open end of the cylinder abuts against the transverse part of the claw, and its closed end abuts against the inner vertical surface of the cover plate.

[0014] As a preferred embodiment of the present invention, straight grooves are symmetrically arranged on both ends of the pit of the testing machine, and straight rods are symmetrically arranged on both ends of the bottom surface of the cover plate, and the straight rods are horizontally slidingly engaged with the corresponding straight grooves.

[0015] The outer end of the horizontal part of the cover plate is vertically connected to a boss, and a locking screw is inserted through the vertical gap in the boss. When the straight rod slides to the outer end of the straight groove, the locking screw is axially screwed and fixed to the corresponding screw hole opened on the bottom surface of the cabin.

[0016] This invention provides a four-wheel drive four-motor test bench vehicle environmental chamber control system, including the four-wheel drive four-motor test bench vehicle environmental chamber as described above; the control system is used to collect and control the temperature and humidity data of the air inside the chamber; the PLC controller built into the control system collects and processes the temperature and humidity data inside the chamber through sensors and sends it to the host computer interface to realize real-time monitoring by the user.

[0017] The beneficial effects of this invention are:

[0018] The fresh air unit in the environmental chamber of this invention compensates for the humidity of the air in the chamber through the air inlet pipe. The air handling box draws the exhaust gas from the rear of the chamber through the guide air duct. After treatment, the exhaust gas is delivered through the top air supply box to form laminar flow air supply. Combined with the negative pressure suction of the exhaust fan, a three-dimensional airflow circulation is formed from front to top and rear to bottom, so as to achieve high-precision temperature field uniformity and solve the problem of temperature and humidity stratification in traditional equipment.

[0019] The oncoming fan driven by the lifting bracket can adjust its height and tilt angle along the long axis of the cabin. Combined with the longitudinal air supply of the air supply box, it can construct a dynamic wind field equivalent to vehicle speed within a certain range, accurately simulating the convection heat dissipation boundary conditions of the four hub motors when the vehicle is in motion.

[0020] The suspended full-spectrum irradiation system supports tilt angle adjustment within a range of 0-90°. Combined with full-spectrum coverage, it accurately reproduces solar radiation heat load at different latitudes and time periods, and conducts enhanced testing, especially for local heat accumulation at the wheel hub motor rim.

[0021] The air duct at the lower rear of the cabin and the exhaust fan at the top create a Venturi effect, which quickly removes the high-temperature exhaust gas generated by the hub motor test, preventing hot air from accumulating at the top of the cabin, effectively controlling the concentration of pollutants inside the cabin, and ensuring the stability of long-term test data. Attached Figure Description

[0022] Figure 1 This diagram shows the overall structure of the four-wheel drive, four-motor vehicle environmental cabin of the present invention.

[0023] Figure 2 A schematic diagram of the full-spectrum irradiation system of the present invention is shown;

[0024] Figure 3 It shows Figure 2 Enlarged view of the structure at part A in the middle;

[0025] Figure 4 This invention shows a schematic diagram of the assembly of the directional fire extinguishing mechanism and the corresponding protective cover plate.

[0026] Figure 5 A three-dimensional structural diagram of the assembly of the fixed support component and the cover plate in this invention is shown;

[0027] Figure 6 This is a front view of the structure of the fixed support component and the cover plate assembly in this invention;

[0028] Figure 7 A three-dimensional structural diagram of the assembly of the fire extinguishing component and the temperature control component in this invention is shown;

[0029] Figure 8 A top view of the fire extinguishing assembly of the present invention is shown;

[0030] Figure 9 It shows Figure 8 Cross-sectional view of the structure along the AA direction;

[0031] Figure 10 A schematic diagram of the internal structure of the temperature control component in this invention is shown;

[0032] Figure 11 It shows Figure 10 Enlarged view of the structure of part B in the middle;

[0033] Figure 12 This diagram shows a demonstration of the operation of the four-wheel drive, four-motor vehicle environmental cabin of the present invention.

[0034] Figure 13 A partial three-dimensional structural schematic diagram of the fire extinguishing component of the present invention is shown;

[0035] Figure 14 It shows Figure 13 Enlarged view of the structure of part C in the middle;

[0036] Figure 15 It shows Figure 13 Cross-sectional view of the structure of the fire extinguishing assembly.

[0037] The diagram shows: 1. Cabin; 11. Cabin door; 2. Test machine; 21. Straight duct; 3. Fresh air unit; 31. Air inlet duct; 4. Front fan; 41. Lifting bracket; 5. Guide air duct; 51. Exhaust fan; 6. Air handling unit; 61. Air supply unit; 7. Full-spectrum irradiation system; 71. Suspension rod; 72. Hanger rod; 73. Full-spectrum lamp; 731. Hanger; 74. Angle adjustment mechanism; 741. Long rotating shaft; 742. Bearing housing; 74 3. Servo motor; 744. Lug; 7441. Tongue seat; 745. Long connecting rod; 746. Transmission gear; 7461. Limit bracket; 747. Transmission rack; 7471. Tongue rod; 8. Cover plate; 81. Straight rod; 82. Long slot; 83. Boss; 831. Locking screw; 9. Directional fire extinguishing mechanism; 91. Fixed support assembly; 911. Support platform; 9111. Arc groove; 912. Clamp; 9121. Claw; 913. Guide rod 914. Support spring; 915. U-shaped seat; 916. Support screw; 9161. Positioning nut; 92. Fire extinguishing assembly; 921. Cylinder; 9211. Cross-shaped component; 9212. Filling port; 9213. Divider; 9214. Through hole; 922. Nozzle; 9221. Diaphragm; 9222. Spray hole; 923. Electric actuator; 9231. Rechargeable battery; 924. Pressurized airbag; 925. Storage and delivery airbag; 9251. Piston plate; 926. Extinguishing agent; 927. Flow guiding assembly; 9271. Spike rod; 9272. Circular block; 9273. Telescopic spring; 9274. Flow guide plate; 9275. Connecting rod; 93. Temperature control assembly; 931. Insulating rigid tube; 932. Socket; 9321. Wire; 933. Temperature sensing cylinder; 934. Insulating guide rod; 935. Shape memory alloy spring; 936. Insulating circular plate; 9361. Conductive sheet; 9362. Guide post; 10. Test vehicle. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0039] Example 1

[0040] To address the technical problems in the background section, the following is presented: a four-wheel drive, four-motor bench-mounted vehicle environmental chamber and its control system.

[0041] Combination Figure 1 and Figure 12As shown, a four-wheel drive, four-motor vehicle environmental chamber includes a chamber body 1, one end of which is equipped with an openable door 11. Two pairs of testing machines 2 are embedded in a rectangular arrangement on the inner bottom surface of the chamber body 1. A fresh air unit 3 is installed at one end of the outer top surface of the chamber body 1, and this fresh air unit 3 is connected to the interior of the chamber body 1 via a compatible air inlet pipe 31. An air handling unit 6 is installed at the other end of the outer top surface of the chamber body 1, and the air outlet of the air handling unit 6 is connected via a pipe to a pipe located on the front of the chamber body 1. The square air supply box 61 is connected in series, and its air inlet is connected in parallel to the air guide ducts 5 located on both sides of the lower rear part of the cabin 1 through pipelines. Exhaust fans 51 are connected to the parallel pipelines located on the top surface of the cabin 1. A front fan 4 is provided on the bottom surface of the front part of the cabin 1 along its long axis, and the front fan 4 is supported by a matching lifting bracket 41. A full-spectrum irradiation system 7 with adjustable illumination angle is suspended on the top surface of the cabin 1.

[0042] By adopting the above technical solution, the fresh air unit 3 in the environmental chamber compensates for the humidity of the air in the chamber through the air inlet pipe 31. The air handling box 6 draws the exhaust gas from the rear of the chamber through the guide air duct 5. After treatment, it forms laminar air supply through the top air supply box 61. Combined with the negative pressure suction of the exhaust fan 51, a three-dimensional airflow circulation is formed from front to top and rear to bottom, achieving high-precision temperature field uniformity and solving the problem of temperature and humidity stratification in traditional equipment.

[0043] The oncoming fan 4 driven by the lifting bracket 41 can adjust its height and tilt angle along the long axis of the cabin 1. Combined with the longitudinal air supply of the air supply box 61, it constructs a dynamic wind field equivalent to vehicle speed within a certain range, accurately simulating the convection heat dissipation boundary conditions of the four wheel hub motors when the vehicle is in motion.

[0044] The suspended full-spectrum irradiation system 7 supports tilt angle adjustment within a range of 0-90°. Combined with full-spectrum coverage, it accurately reproduces solar radiation heat load at different latitudes and time periods, and conducts enhanced testing, especially for local heat accumulation at the wheel hub motor rim.

[0045] The air duct 5 at the lower rear of the cabin 1 and the exhaust fan 51 at the top form a Venturi effect, which quickly exhausts the high-temperature exhaust gas generated by the hub motor test, avoids the accumulation of hot air at the top of the cabin, effectively controls the concentration of pollutants in the cabin 1, and ensures the stability of long-term test data.

[0046] Specifically, the fresh air unit 3 in the environmental chamber delivers temperature and humidity controllable fresh airflow into the chamber 1 through the air inlet duct 31. Under the guidance of the front fan 4 in the front of the chamber 1, the airflow blows past the test vehicle 10 and enters the inlet of the guide air duct 5 at the rear of the chamber 1. The airflow passes through the guide air duct 5 and is blown into the air handling box 6 under the guidance of the exhaust fan 51. After being processed by the air handling box 6, the airflow is evenly blown into the chamber 1 by the air supply fan box 61, thus completing an air handling cycle and realizing temperature and humidity control in the chamber 1.

[0047] Example 2

[0048] Combination Figures 1-3 as well as Figure 12 As shown, based on the above embodiments, this embodiment further provides the following:

[0049] In this embodiment, as Figures 1-3 as well as Figure 12 As shown, the full-spectrum irradiation system 7 includes multiple suspension rods 71, which are connected in a crisscross pattern to form a rectangular grid. Each intersection point has a hanging rod 72 vertically connected to the top surface of the cabin 1. Multiple full-spectrum lamps 73 are suspended in a straight line at equal intervals directly below the suspension rods 71 ​​along the long side. The upper part of the housing end face of the full-spectrum lamp 73 is pivotally connected to a hanging bracket 731 with an inverted U-shaped structure that is vertically fixed to the bottom surface of the corresponding suspension rod 71. Multiple full-spectrum lamps 73 located below the same suspension rod 71 can be synchronously positioned and rotated left and right within an acute angle range through an angle adjustment mechanism 74 set on the top surface of the suspension rod 71.

[0050] By adopting the above technical solution, the rectangular grid frame formed by the intersection of the suspension rods 71, together with the top fixing structure of the hanger 72, forms a vibration-resistant rigid support system; the full-spectrum lamps 73 arranged at equal intervals under each suspension rod are connected by the pivot of the bracket 731 to form an independent suspension unit, and together with the angle adjustment mechanism 74, the full-spectrum lamps 73 can be steplessly adjusted within the range of 0-90°, which can accurately reproduce the changes in solar altitude angle in different latitude regions, and the coverage area is improved compared with the traditional system.

[0051] Multiple full-spectrum lamps 73 under the same suspension rod 71 are synchronously deflected through the angle adjustment mechanism 74 to ensure the consistency of the incident angle at each test point; combined with the longitudinal and transverse layout of the grille frame, a gradient irradiation mode can be formed to meet the thermal shock testing requirements of irregularly shaped components such as vehicle wheel hub motor rims and battery packs under moving light.

[0052] like Figure 2 and Figure 3As shown, the angle adjustment mechanism 74 includes a long rotating shaft 741, which rotates vertically through multiple suspension rods 72 on the corresponding suspension rod 71. One end of the long rotating shaft 741 is rotatably connected to a bearing seat 742, and the other end is axially connected to a servo motor 743. The upper part of the housing side of the full-spectrum lamp 73 is vertically and symmetrically fixed with hanging ears 744, and a long connecting rod 745 is fixedly connected between multiple hanging ears 744 on the same side. The ends of the long rotating shaft 741 are respectively axially fixed through... A transmission gear 746 is connected to the corresponding lugs 744 at the head and tail, which are located in the same vertical plane. An open transmission rack 747 is meshed with the transmission gear 746. The ends of the transmission rack 747 are respectively connected to tongue rods 7471. The bottom ends of the tongue rods 7471 are pivotally connected to U-shaped tongue seats 7441 fixed to the outer side of the top surface of the corresponding lugs 744. A U-shaped limiting frame 7461 is invertedly fastened to the outer side of the transmission gear 746. The two sides of the limiting frame 7461 are rotatably connected to the long rotating shaft 741.

[0053] By adopting the above technical solution, a servo motor 743 drives a long rotating shaft 741, which, in conjunction with the meshing transmission of a transmission gear 746 and an open-type transmission rack 747, converts rotational motion into linear displacement, thereby achieving precise adjustment of the angle of a single lamp. The gap design between the limit bracket 7461 and the outer side of the transmission gear 746 eliminates axial movement of the transmission gear 746 and avoids frictional loss, ensuring the accuracy of angle repeatability after high-frequency cycles.

[0054] Multiple full-spectrum lamps 73 below the suspension rod 71 are rigidly connected to a long connecting rod 745 via lugs 744, forming a mechanical synchronization unit. When the long rotating shaft 741 rotates, the transmission rack 747 drives the tongue rod 7471 to pivot within the tongue seat 7441, forcing all lugs 744 to deflect synchronously. This mechanical rigid connection method eliminates the angle deviation of each lamp compared to the traditional independent control mode of electric push rods, and is especially suitable for dynamic test scenarios simulating continuous changes in the angle of sunlight during vehicle movement.

[0055] Example 3

[0056] Combination Figure 1 as well as Figures 4 to 11 As shown, based on the above embodiments, this embodiment further provides the following:

[0057] In this embodiment, as Figure 1 and Figure 4 As shown, each of the four test machines 2 is slidably provided with an L-shaped cover plate 8 that is adapted to its size along the short side of the cabin 1. Each cover plate 8 has a directional fire extinguishing mechanism 9 along its centerline on the top surface of the horizontal part for automatically extinguishing the corresponding hub motor of the test vehicle 10 on the test machine 2.

[0058] The directional fire extinguishing mechanism 9 includes a fixed support component 91 disposed on the top surface of the horizontal part of the corresponding cover plate 8. The fixed support component 91 is equipped with a fire extinguishing component 92 containing a fire extinguishing agent 926, which is in a liquid state at room temperature. The fire extinguishing component 92 automatically activates by sensing the flame temperature through a temperature control component 93 that extends forward and is disposed on the top surface of the vertical part of the cover plate 8, and sprays the fire extinguishing agent 926 through the vertical part of the cover plate 8.

[0059] By adopting the above technical solution, the protective cover 8 is slidable along the short side of the cabin. Its horizontal part is used to cover the test machine 2 when not in operation, and its vertical part forms a protective distance with the side of the hub motor.

[0060] The directional fire suppression mechanism 9 is designed to promptly address the possibility of accidental fires in the hub motors under extreme operating conditions during testing of new energy vehicles driven by four-wheel hub motors in the environmental chamber. When the temperature control component 93 detects the flame temperature of the hub motor, it automatically activates the fire suppression component 92, aiming it at the fire source. It then precisely and at high speed sprays a liquid fire extinguishing agent 926 (e.g., environmentally friendly, efficient, and safe perfluorohexanone, which leaves no residue after evaporation and effectively protects the hub motor) onto the hub motor's brake disc. This significantly shortens the fire suppression response time compared to traditional top-spray fire suppression systems installed on the ceiling of the chamber 1. This fire suppression solution effectively reduces the footprint compared to traditional solutions and is particularly suitable for independent fire suppression operations in scenarios with differentiated faults in the four-wheel hub motors.

[0061] like Figure 1 , Figures 4-6 As shown, straight grooves 21 are symmetrically arranged on both ends of the pit of the testing machine 2, and straight rods 81 are symmetrically arranged on both ends of the bottom surface of the cover plate 8. The straight rods 81 are horizontally sliding and engaging with the corresponding straight grooves 21.

[0062] The outer end of the horizontal portion of the cover plate 8 is vertically connected to a boss 83. A locking screw 831 is inserted through the vertical gap in the boss 83. When the straight rod 81 slides to the outer end of the straight groove 21, the locking screw 831 is axially screwed and fixed to the corresponding screw hole opened on the inner bottom surface of the cabin 1.

[0063] By adopting the above technical solution, the straight rod 81 and the straight groove 21 form a linear sliding fit, allowing the cover plate 8 to adjust its stroke along the short side of the cabin. When the straight rod slides to the end of the straight groove, the positioning reference surface of the boss 83 contacts the bottom surface of the cabin, and the locking screw 831 is axially locked with the screw hole of the cabin, so that the cover plate 8 is fully exposed to the corresponding test machine 2 and its position is locked to prevent the fire extinguishing component 92 from moving around when the fire extinguishing agent 926 is sprayed. This structure keeps the amplitude of the cover plate 8 within a small range during the four-wheel hub motor synchronous loading test, avoiding the resonance of the cover plate 8 that could cause the directional fire extinguishing mechanism 9 to be falsely triggered.

[0064] like Figures 7-9 As shown, the fire extinguishing assembly 92 includes a cylinder 921 horizontally fixed to the top of the fixed support assembly 91. The cylinder 921 is a non-pressurized circular structure, with one end open and the other end closed. A nozzle 922 is vertically connected to the center of the closed end, and a diaphragm 9221 is sealed to the inner port of the nozzle 922. The nozzle 922 passes through an elongated hole 82 longitudinally opened on the center line of the vertical part of the cover plate 8. The cylinder 921 is divided into two chambers by a partition 9213 axially arranged in its middle. A push airbag 924 is axially sealed to the vertical surface of the partition 9213 of the front chamber, and a storage airbag 925 is axially sealed to the vertical surface of the partition 9213 of the rear chamber. The bladder 925 and the pressure bladder 924 are connected by a through hole 9214 axially opened in the middle of the partition 9213; the front chamber of the cylinder 921 is filled with the extinguishing agent 926 through the filling port 9212 opened at the top of the cylinder 921, and an electric push rod 923 with a series rechargeable battery 9231 is axially suspended in the middle of the rear chamber port. The electric push rod 923 is fixedly engaged with the cross 9211 fixed to the opening end of the cylinder 921; the outer end face of the storage bladder 925 is axially connected to a piston plate 9251, and the piston plate 9251 is axially slidably attached to the inner wall of the cylinder 921; the power output end of the electric push rod 923 is perpendicularly connected to the piston plate 9251.

[0065] By adopting the above technical solution, the fire extinguishing component 92 achieves rapid response and precise fire extinguishing through a non-pressurized power transmission structure and an airbag-linked pressurization mechanism, and the normal unpressurized storage of fire extinguishing agent is safer.

[0066] When the electric push rod 923 extends, it pushes the piston plate 9251 at high speed to compress the storage airbag 925, causing the gas inside to be continuously pressed into the push airbag 924 through the through hole 9214, forming a stepped pressurization. The push airbag 924 uses a conical expansion structure to axially compress the extinguishing agent 926. When the pressure exceeds the set threshold of the diaphragm 9221, the perfluorohexanone extinguishing agent is atomized into micron-sized droplets and sprayed out through the nozzle 922. Compared with the traditional non-pressurized fire extinguishing device that uses an electrically triggered gas generator to produce high-pressure gas to spray out the extinguishing agent, its response speed is effectively improved.

[0067] When the electric push rod 923 retracts, the gravitational compression of the extinguishing agent 926 causes the pressure bladder 924 to contract, and the residual gas inside is back-pressurized to the storage bladder 925, forming a closed-loop gas circulation. The energy consumption for a single fire extinguishing is effectively reduced compared to the compression energy consumption required by traditional pressure tanks.

[0068] Preferably, the compression airbag 924 and the storage airbag 925 are made of three-layer composite fluorosilicone rubber, which can withstand multiple expansion-contraction cycles, thereby extending the maintenance cycle and reducing the operation and maintenance cost.

[0069] Preferably, the nozzle 922 and the cylinder 921 are connected by a sealed threaded connection structure. After one fire is extinguished, the nozzle 922 can be disassembled, the diaphragm 9221 can be reinstalled, and then the nozzle can be sealed and screwed back to the cylinder 921. The extinguishing agent can be refilled through the filling port 9212 on the cylinder 921, so that the fire extinguishing component 92 can be reused, saving costs.

[0070] The fire extinguishing component 92 is controlled by electromechanical-hydraulic integration, which effectively improves the utilization rate of the extinguishing agent 926 compared to the traditional top-spray fire extinguishing scheme. It is especially suitable for independent and precise fire extinguishing in the case of differentiated faults of four-wheel hub motors, while avoiding secondary pollution caused by the diffusion of a large amount of extinguishing agent in the cabin temperature and humidity control system.

[0071] like Figures 13-15 As shown, the end face of the nozzle 922 is provided with a conical part, and a plurality of spray holes 9222 are equally spaced around the conical surface of the conical part; the end face of the conical part is provided with a flow guiding component 927 for guiding the fire extinguishing agent 926 atomized into droplets in an umbrella-shaped spray.

[0072] The flow guiding assembly 927 includes a spike rod 9271, which axially passes through the nozzle 922 from the end face of the conical portion. A circular block 9272 is axially and vertically fixed to the tail end of the spike rod 9271. A telescopic spring 9273 is axially sleeved on the spike rod 9271. One end of the telescopic spring 9273 is connected to the circular block 9272, and the other end is connected to the end face of the conical portion. Each nozzle 9222 has a flow guiding plate 9274 at its front end. One end of the flow guiding plate 9274 is pivotally connected to the edge of the end face of the conical portion. A connecting rod 9275 is provided between the flow guiding plate 9274 and the circular block 9272. One end of the connecting rod 9275 is pivotally connected to the inner surface of the corresponding flow guiding plate 9274, and the other end is pivotally connected to the outer circumferential surface of the circular block 9272.

[0073] The telescopic spring 9273 has two states: a natural state and a tensile state. In the natural state, the conical part of the spike 9271 approaches the diaphragm 9221, and the multiple guide plates 9274 expand outward in an umbrella shape under the support of the corresponding connecting rods 9275. In the tensile state, the atomized droplets of extinguishing agent 926 sprayed from the nozzle 9222 impact the corresponding guide plate 9274, and the connecting rod 9275 applies a pulling force to pull the spike 9271 outward, causing the guide plate 9274 to retract inward. The retraction range decreases as the extinguishing agent 926 in the cylinder 921 is consumed.

[0074] By adopting the above technical solution, the problem of poor fire extinguishing effect can be solved when the hub motor catches fire unexpectedly under extreme operating conditions. The nozzles, which are horizontally facing the hub motor, spray the pressurized perfluorohexanone fire extinguishing agent, which is atomized into micron-sized droplets, in a straight line towards the hub motor. This spraying method results in a small coverage area of ​​the fire extinguishing agent, which is generally aimed at the central area of ​​the hub motor. The outer area of ​​the hub motor itself receives less fire extinguishing agent, and the outermost areas of the test vehicle, such as the wheel hub and tires, receive even less fire extinguishing agent.

[0075] The flow guiding component 927 can dynamically adjust the spray pattern to achieve a "penetrate first, then cover" fire extinguishing strategy, effectively improving the overall fire extinguishing effect in the hub motor area.

[0076] When the fire extinguishing assembly 92 is activated, the extinguishing agent 926 inside the cylinder 921 presses against the diaphragm 9221, causing the diaphragm 9221 to deform under pressure and touch the conical part of the spike bar 9271. The conical part generates a stress concentration effect, which greatly reduces the rupture threshold of the diaphragm 9221, making the diaphragm 9221 easier to rupture and further shortening the time for the extinguishing agent 926 to be sprayed.

[0077] Initial high-pressure stage (when the extinguishing agent is full): The high-pressure atomized droplets ejected from the nozzle 9222 impact the inner surface of the guide plate 9274. The impact force is converted into an axial pulling force on the circular block 9272 through the connecting rod 9275, which overcomes the elastic force of the telescopic spring 9273 and pulls the spike rod 9271 outward. The guide plate 9274 retracts inward to form a focused spray angle, so that the extinguishing agent 926 concentrates to impact the core fire source of the hub motor. In this stage, the kinetic energy advantage of the high-pressure fluid is utilized to ensure that the extinguishing agent 926 penetrates the center of the flame and rapidly reduces the core temperature.

[0078] Mid-term transition phase (30%-70% extinguishing agent consumption): The pressure inside the cylinder 921 decreases, resulting in a weakening of the spray impact force. The telescopic spring 9273 gradually retracts, and the guide plate 9274 is gradually extended to the medium angle through the connecting rod 9275. The spray coverage area extends to the periphery of the hub motor and the adjacent hub area, forming a ring-shaped protective zone.

[0079] In the final low-pressure stage (extinguishing agent remaining <30%): the spike bar 9271 is fully reset under the action of spring force, the deflector 9274 unfolds to the initial wide angle, and the extinguishing agent 926 diffuses in an umbrella shape, covering the outer perimeter areas such as tires to prevent these flammable areas from reigniting.

[0080] Preferably, the outer surface of the guide plate 9274 can be set as an arc-shaped surface; this can significantly optimize the hydrodynamic characteristics and spatial coverage effect of the extinguishing agent.

[0081] like Figure 7 , Figure 10 and Figure 11As shown, the temperature control component 93 includes an insulating rigid tube 931 horizontally fixed to the middle of the top surface of the vertical part of the corresponding cover plate 8. The rear end of the insulating rigid tube 931 is axially connected to a socket 932. The inner surface of the socket 932 has radially symmetrical insertion holes. The two insertion holes are respectively connected in series with the electric push rod 923 and its rechargeable battery 9231 through compatible wires 9321. The front end of the heat-sensing cylinder 933 is axially connected to a temperature sensing cylinder 933, and the front end of the temperature sensing cylinder 933 is close to the corresponding wheel hub of the test vehicle 10. The front end of the temperature sensing cylinder 933 is axially connected to a shape memory alloy spring that can be stretched by heat. Spring 935, the rear end of which is axially connected to an insulating circular plate 936, an insulating guide rod 934 is inserted through the axial gap in the insulating circular plate 936, one end of the insulating guide rod 934 is connected to the inner surface of the socket 932, and the other end is connected to the inner front end of the temperature sensing cylinder 933; a U-shaped conductive sheet 9361 is fixedly attached to the front end of the insulating circular plate 936, and the ends of the conductive sheet 9361 are respectively radially and vertically symmetrically connected to guide posts 9362, which can be inserted into the socket 932 to connect the power supply circuit of the electric push rod 923.

[0082] By adopting the above technical solution, the temperature control component 93, through mechanical thermal triggering and modular circuit design, achieves precise fire extinguishing control in high-temperature environments.

[0083] The shape memory alloy spring 935 (preferably a nickel-titanium double-stroke shape memory alloy spring, capable of reversible deformation cycles through temperature changes) elongates when the hub motor overheats due to fire, pushing the insulating circular plate 936 forward. This causes the guide post 9362 of the U-shaped conductive sheet 9362 to engage with the socket (not shown) of the socket 932, forming a closed circuit. This mechanical triggering mechanism significantly improves the response speed compared to traditional electronic sensors and requires no external power supply, making it particularly suitable for complex operating conditions with high electromagnetic interference levels within the cabin 1.

[0084] The insulating guide rod 934 and the insulating circular plate 936 are fitted together with a gap to ensure that the spring deformation trajectory is strictly along the axial direction, and to avoid poor contact caused by radial displacement of the conductive sheet 9361.

[0085] An insulating rigid tube 931 (preferably made of alumina ceramic material, with a temperature resistance of 1200℃) physically isolates the socket 932 from the temperature sensing cylinder 933, and together with the insulating circular plate 936, ensures that there is a certain distance between the conductive circuit and the high-temperature component, so that the circuit insulation resistance is maintained even when the surface temperature of the hub motor is high.

[0086] The front end of the temperature sensing cylinder 933 preferably adopts a thin-walled structure, which effectively improves the efficiency of transferring the heat flow of the hub motor to the shape memory alloy spring 935 and effectively improves the detection sensitivity.

[0087] This design effectively reduces the failure rate of the temperature control component 93 in extreme environments compared to traditional solutions through all-mechanical triggering and multiple insulation protections, while also improving the accuracy of temperature detection. It is particularly suitable for independent fire suppression control in differentiated overheating scenarios of four-wheel hub motors.

[0088] like Figure 5 and Figure 6 As shown, the fixed support assembly 91 includes a horizontally arranged support platform 911. Guide rods 913 are vertically and symmetrically inserted at the four corners of the support platform 911, and the bottom end of the guide rods 913 is fixedly connected to the top surface of the horizontal part of the corresponding cover plate 8. A support spring 914 is axially sleeved on the guide rod 913. The bottom end of the support spring 914 is connected to the cover plate 8, and its top end is connected to the support platform 911. A U-shaped seat 915 is vertically connected to the middle of the bottom surface of the support platform 911. A support screw 916 is inserted through the middle of the U-shaped seat 915, and the bottom end of the support screw 916 is fixedly connected to the top surface of the horizontal part of the cover plate 8. The U-shaped seat 915 is clamped and connected by two positioning nuts 9161 axially screwed to the support screw 916. The cylinder 921 of the fire extinguishing assembly 92 is horizontally fixedly connected to the top surface of the support platform 911.

[0089] By adopting the above technical solution, the fixed support component 91, through a multi-level buffer and precise lifting and positioning structure, achieves stable support and dynamic adjustment of the fire extinguishing component 92, so that the nozzle 922 can move longitudinally along the elongated hole 82 to align with the center position of the hub motor. This is beneficial for the subsequent fire extinguishing agent to fully cover the hub motor and improve the single fire extinguishing effect.

[0090] The double-nut locking structure of the U-shaped seat 915 and the support screw 916 allows for vertical position adjustment of the support platform 911 by adjusting the position of the positioning nut 9161 of the support screw 916. This adapts to the installation height of different models of fire extinguishing components 92 and meets the testing requirements of hub motors with different diameters.

[0091] The four guide rods 913 and the support springs 914 form a symmetrical layout. When the test machine 2 is subjected to the torque impact of the four hub motors, the support platform 911 can float vertically along the guide rods 913, and the vibration acceleration can be attenuated.

[0092] Four guide rods 913 and support screws 916 form a five-point statically determinate support, ensuring uniform pressure on the diaphragm 9221. Loosening the positioning nut 9161 allows for the complete disassembly of the support platform 911 along with the fire extinguishing assembly 92, without the need to remove the cover plate 8, thus significantly improving maintenance efficiency compared to traditional welded structures.

[0093] like Figure 5 and Figure 6As shown, an arc-shaped groove 9111 is formed through the center of the top surface of the support platform 911, and the lower part of the cylinder 921 is engaged with the arc-shaped groove 9111; an "Ω"-shaped clamp 912 is radially engaged with the upper part of the cylinder 921, and the bottom end of the clamp 912 is fixed to the support platform by bolts; an L-shaped claw 9121 is radially and vertically symmetrically connected to the rear end face of the clamp 912, the open end of the cylinder 921 abuts against the transverse part of the claw 9121, and its closed end abuts against the inner vertical surface of the cover plate 8.

[0094] By adopting the above technical solution, the arc groove 9111, clamp 912 and claw 9121 are designed with multi-dimensional limiting and adaptive locking, which realizes the high stability of fire extinguishing component 92 installation and rapid maintenance.

[0095] The arc-shaped groove 9111 forms a line contact support with the lower part of the cylinder 921. Together with the Ω-shaped covering of the clamp 912, the vibration stress is distributed to the four guide rods 913 of the support platform 911, thereby reducing the radial displacement of the cylinder 921 under vibration.

[0096] The transverse part of the claw 9121 forms an axial gap with the open end of the cylinder 921, and the closed end maintains a gap contact with the inner vertical surface of the cover plate 8. Under the reaction force of the extinguishing agent spray, the amount of forward and backward movement of the cylinder 921 is limited, ensuring that the axis deviation between the nozzle 922 and the elongated hole 82 is small.

[0097] Loosening the bolts of clamp 912 releases the Ω-shaped constraint, and the cylinder 921 is lifted up along the arc groove 9111 to complete disassembly.

[0098] Example 4

[0099] Combination Figure 1 and Figure 12 As shown, based on the above embodiments, this embodiment further provides the following:

[0100] In this embodiment, a four-wheel drive four-motor test bench vehicle environmental chamber control system includes the four-wheel drive four-motor test bench vehicle environmental chamber as described above; the control system is used to collect and control the temperature and humidity data of the air inside the chamber 1; the PLC controller built into the control system collects and processes the temperature and humidity data inside the chamber 1 through sensors and sends it to the host computer interface to realize real-time monitoring by the user.

[0101] By adopting the above technical solution, the control system achieves precise control of the four-wheel hub motor testing environment through integrated environmental regulation and intelligent monitoring. This control system can collect and adjust parameters such as temperature and humidity within the vehicle environmental test chamber.

[0102] Working principle and usage process of this invention:

[0103] When in use, this invention can be divided into three core stages: environmental simulation, testing and monitoring, and targeted fire suppression.

[0104] 1. Environmental Simulation Phase

[0105] The fresh air unit 3 delivers temperature- and humidity-controlled fresh air into the cabin through the air inlet duct 31. The air handling unit 6 extracts exhaust gas from the rear of the cabin through the guide duct 5, purifies and adjusts the temperature, and then delivers laminar air through the air supply unit 61, forming a three-dimensional airflow circulation in conjunction with the exhaust fan 51. The lifting bracket 41 adjusts the height of the oncoming fan 4 to simulate a wind field at vehicle speeds of 0-120 km / h. The full-spectrum irradiation system 7 adjusts the lamp angle through the angle adjustment mechanism 74: the servo motor 743 drives the long rotating shaft 741 to rotate, which is linked with the transmission gear 746 and the transmission rack 747 to make the full-spectrum lamps 73 under the same suspension rod 71 deflect synchronously, accurately reproducing the solar irradiation conditions at different latitudes.

[0106] 2. Four-wheel hub motor testing phase

[0107] The test vehicle 10 is placed on the testing machine 2. The cover plate 8 slides along the straight groove 21 to the corresponding position via the straight rod 81, and the locking screw 831 fixes the boss 83. The four-wheel hub motor operates under high load conditions, and the air duct 5 guides the heat dissipation airflow of the motor to the air handling box 6 for temperature and humidity regulation. The radiant heat generated by the full-spectrum lamp 73 is precisely applied to the wheel hub through an adjustable angle to simulate the heat load distribution during actual driving.

[0108] 3. Targeted fire suppression triggering phase

[0109] When an overheated hub motor causes a fire: the shape memory alloy spring 935 at the front end of the heat-sensing cylinder 933 stretches due to heat, pushing the insulating circular plate 936 forward, causing the guide post 9362 to insert into the socket 932 to connect the circuit; the electric push rod 923 starts, pushing the piston plate 9251 to compress the storage airbag 925, and the gas enters the pressure airbag 924 through the through hole 9214, squeezing the extinguishing agent 926 to rupture the diaphragm 9221; the perfluorohexanone extinguishing agent is atomized and sprayed through the nozzle 922 to cover the fire source area; the support spring 914 buffers the extinguishing recoil force, and the clamp 912 and the arc groove 9111 constrain the displacement of the cylinder 921 to keep the spray axis stable.

[0110] 4. System Reset Phase

[0111] After the fire is extinguished, unlock the clamp bolt 912, replace the cylinder 921, and rotate the positioning nut 9161 to adjust the height of the support platform 911. The servo motor 743 reverses to reset the full-spectrum lamp 73, and the fresh air unit 3 increases the ventilation volume to expel residual extinguishing agent.

[0112] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A four-wheel drive, four-motor vehicle environmental test chamber, comprising a chamber body (1), one end of which is provided with an openable door (11), and two pairs of test machines (2) are embedded in a rectangular arrangement on its inner bottom surface, characterized in that: A fresh air unit (3) is provided at one end of the outer top surface of the cabin (1), and the fresh air unit (3) is connected to the interior of the cabin (1) through a matching air inlet pipe (31); an air handling box (6) is provided at the other end of its outer top surface, and the air outlet of the air handling box (6) is connected in series with the air supply fan box (61) located at the upper front of the cabin (1) through a pipe, and its air inlet is connected in parallel with the guide air ducts (5) located on both sides of the lower rear of the cabin (1) through pipes, and exhaust fans (51) are connected to the parallel pipes located on the outer top surface of the cabin (1); a front fan (4) is provided along its long axis on the bottom front surface of the cabin (1), and the front fan (4) is supported by a matching lifting bracket (41); a full-spectrum irradiation system (7) with adjustable illumination angle is suspended on the top surface of the cabin (1). The full-spectrum irradiation system (7) includes multiple suspension rods (71), which are connected in a crisscross pattern to form a rectangular grid. Each intersection point has a vertically connected rod (72) fixed to the top surface of the cabin (1). Multiple full-spectrum lamps (73) are suspended in a straight line at equal intervals directly below the suspension rods (71) along the long side. The upper part of the shell end face of the full-spectrum lamp (73) is pivotally connected to a hanging bracket (731) with an inverted U-shaped structure that is vertically fixed to the bottom surface of the corresponding suspension rod (71). Multiple full-spectrum lamps (73) located below the same suspension rod (71) can simultaneously achieve left and right positioning and rotation within an acute angle range through an angle adjustment mechanism (74) set on the top surface of the suspension rod (71). The angle adjustment mechanism (74) includes a long rotating shaft (741) that rotates vertically through multiple suspension rods (72) on the corresponding suspension rod (71). One end of the long rotating shaft (741) is rotatably connected to a bearing seat (742), and the other end is axially connected to a servo motor (743). The upper part of the side surface of the full-spectrum lamp (73) is vertically and symmetrically fixed with lugs (744), and a long connecting rod (745) is fixedly connected between multiple lugs (744) on the same side. The ends of the long rotating shaft (741) are respectively axially fixedly connected with... A transmission gear (746) is located in the same vertical plane as the corresponding lugs (744) at the head and tail. An open transmission rack (747) is meshed on the transmission gear (746). The ends of the transmission rack (747) are respectively connected to tongue rods (7471). The bottom ends of the tongue rods (7471) are pivotally connected to U-shaped tongue seats (7441) fixed to the outer side of the top surface of the corresponding lugs (744). A U-shaped limiting frame (7461) is invertedly fastened to the outer side of the transmission gear (746). The two sides of the limiting frame (7461) are rotatably connected to the long rotating shaft (741).

2. The four-wheel drive, four-motor test bench for vehicle environmental chamber according to claim 1, characterized in that: Each of the four test machines (2) is equipped with an L-shaped cover plate (8) that is adapted to its size and is slidably installed along the short side of the cabin (1). Each cover plate (8) has a directional fire extinguishing mechanism (9) along its center line on the top horizontal part of the cover plate (8) for automatically extinguishing the corresponding hub motor of the test vehicle (10) on the test machine (2). The directional fire extinguishing mechanism (9) includes a fixed support assembly (91) disposed on the top surface of the horizontal part of the corresponding cover plate (8). The fixed support assembly (91) is equipped with a fire extinguishing component (92) containing a fire extinguishing agent (926), and the fire extinguishing agent (926) is in a liquid state at room temperature. The fire extinguishing component (92) automatically opens by sensing the flame temperature through a temperature control component (93) that extends forward and is disposed on the top surface of the vertical part of the cover plate (8), and sprays the fire extinguishing agent (926) through the vertical part of the cover plate (8).

3. The four-wheel drive, four-motor test bench for vehicle environmental chamber according to claim 2, characterized in that: The fire extinguishing assembly (92) includes a cylinder (921) horizontally fixed to the top of the fixed support assembly (91). The cylinder (921) is a non-pressurized circular structure with one end open and the other end closed. A nozzle (922) is vertically connected to the middle of the closed end, and a diaphragm (9221) is sealed to the inner port of the nozzle (922). The nozzle (922) passes through a long slot (82) longitudinally opened on the center line of the vertical part of the cover plate (8). The cylinder (921) is divided into two chambers by a partition (9213) axially arranged in the middle. A push airbag (924) is axially sealed to the vertical surface of the partition (9213) of the front chamber, and a storage airbag (925) is axially sealed to the vertical surface of the partition (9213) of the rear chamber. 5) The pressure airbag (924) is connected to the cylinder (9213) through a through hole (9214) axially opened in the middle of the partition (9213); the front chamber of the cylinder (921) is filled with the extinguishing agent (926) through the filling port (9212) opened at the top of the cylinder (921), and an electric push rod (923) with a series rechargeable battery (9231) is axially suspended in the middle of the rear chamber port. The electric push rod (923) is fixedly snapped with a cross (9211) fixed to the opening end of the cylinder (921); the outer end face of the storage airbag (925) is axially connected to a piston plate (9251), and the piston plate (9251) is axially slidably attached to the inner wall of the cylinder (921); the power output end of the electric push rod (923) is vertically connected to the piston plate (9251).

4. The four-wheel drive, four-motor test bench for vehicle environmental chamber according to claim 3, characterized in that: The temperature control component (93) includes an insulating rigid tube (931) horizontally fixed to the middle of the top surface of the vertical part of the corresponding cover plate (8). The rear end of the insulating rigid tube (931) is axially connected to a socket (932). The inner surface of the socket (932) is radially symmetrically provided with insertion holes. The two insertion holes are respectively connected in series with the electric push rod (923) and its rechargeable battery (9231) through a matching wire (9321). The front end of the heat-sensitive cylinder (933) is axially connected to the temperature sensing cylinder (933), and the front end of the temperature sensing cylinder (933) is close to the corresponding wheel hub of the test vehicle (10). The front end of the temperature sensing cylinder (933) is axially connected to a heat-stretchable memory alloy spring (933). 35) An insulating circular plate (936) is axially connected to the rear end of the memory alloy spring (935). An insulating guide rod (934) is inserted through the axial gap in the insulating circular plate (936). One end of the insulating guide rod (934) is connected to the inner surface of the socket (932), and the other end is connected to the front end of the temperature sensing cylinder (933). A U-shaped conductive sheet (9361) is fixedly attached to the front end face of the insulating circular plate (936). The ends of the conductive sheet (9361) are respectively radially and vertically symmetrically connected to guide posts (9362). The guide posts (9362) can be inserted into the corresponding holes of the socket (932) to connect the power supply circuit of the electric push rod (923).

5. The four-wheel drive, four-motor test bench for vehicle environmental chamber according to claim 3, characterized in that: The fixed support assembly (91) includes a horizontally arranged support platform (911). Guide rods (913) are vertically and symmetrically inserted at the four corners of the support platform (911). The bottom end of each guide rod (913) is fixedly connected to the top surface of the corresponding horizontal portion of the cover plate (8). A support spring (914) is axially sleeved on each guide rod (913). The bottom end of the support spring (914) is connected to the cover plate (8), and its top end is connected to the support platform (911). The support platform (911)... 11) A U-shaped seat (915) is vertically connected to the middle of the bottom surface. A support screw (916) is inserted through the gap in the middle of the U-shaped seat (915). The bottom end of the support screw (916) is fixed to the top surface of the horizontal part of the cover plate (8). The U-shaped seat (915) is clamped and connected by two positioning nuts (9161) that are axially screwed to the support screw (916). The cylinder (921) of the fire extinguishing assembly (92) is horizontally fixed to the top surface of the support platform (911).

6. The four-wheel drive, four-motor test bench for vehicle environmental chamber according to claim 5, characterized in that: An arc-shaped groove (9111) is provided through the middle of the top surface of the support platform (9111), and the lower part of the cylinder (921) is engaged with the arc-shaped groove (9111). An "Ω"-shaped clamp (912) is radially engaged with the upper part of the cylinder (921), and the bottom end of the clamp (912) is fixed to the support platform by bolts. An L-shaped claw (9121) is radially and vertically symmetrically connected to the rear end face of the clamp (912). The open end of the cylinder (921) abuts against the transverse part of the claw (9121), and its closed end abuts against the inner vertical surface of the cover plate (8).

7. The four-wheel drive, four-motor test bench for vehicle environmental chamber according to claim 2, characterized in that: The pit of the test machine (2) is symmetrically provided with straight grooves (21) at both ends, and the bottom surface of the cover plate (8) is symmetrically provided with straight rods (81) at both ends. The straight rods (81) are horizontally sliding and engaging with the corresponding straight grooves (21). The outer end of the horizontal part of the cover plate (8) is vertically connected to a boss (83), and a locking screw (831) is inserted through the vertical gap in the boss (83). When the straight rod (81) slides to the outer end of the straight groove (21), the locking screw (831) is axially screwed to the corresponding screw hole opened on the bottom surface of the cabin (1).

8. A four-wheel drive, four-motor benchtop vehicle environmental cabin control system, characterized in that: The system includes a four-wheel drive four-motor test bench for the whole vehicle environment as described in any one of 1 to 7 above; the control system is used to collect and control the temperature and humidity data of the air inside the cabin (1); the PLC controller in the control system collects and processes the temperature and humidity data inside the cabin (1) through sensors and sends it to the host computer interface to realize real-time monitoring by the user.

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