Vehicle road spectrum simulation experiment system and control method thereof

Abstract

The invention discloses a vehicle road spectrum simulation experiment system and a control method thereof, and relates to the field of vehicle testing. The vehicle road spectrum simulation experiment system comprises a plurality of simulation device bodies, an electric bearing device and a pneumatic bearing device are arranged in each simulation device body, the tops of the electric bearing devices and the tops of the pneumatic bearing devices are connected with bearing limiting platforms, and the bearing limiting platforms are used for bearing wheels of a vehicle; the pneumatic interconnection bearing system is respectively communicated with the plurality of pneumatic bearing devices and is used for adjusting the pneumatic pressure in each pneumatic bearing device; the multi-servo-motor drive control system is connected with the simulation device bodies, can collect and receive displacement and load information of the bearing limiting platform, and can control the working states of the electric bearing device and the pneumatic interconnection bearing system according to the collected information. According to the vehicle road spectrum simulation experiment system and the control method thereof, the bearing capacity can be improved, the power of the servo motor can be reduced as much as possible, and power consumption is reduced.

Description

Technical Field

[0001] This invention relates to the field of vehicle testing technology, and in particular to a vehicle road spectrum simulation experimental system and its control method. Background Technology

[0002] As a crucial component of automobiles, vehicle suspension is designed to dissipate vibration energy, thereby enhancing ride comfort. Vehicle road spectrum simulation systems can effectively evaluate suspension performance. Existing vehicle road spectrum simulation systems mainly include hydraulic vehicle vibration testing systems and servo-electric cylinder-only vehicle vibration testing systems. Hydraulic vehicle vibration testing systems utilize the reciprocating motion of a piston within a hydraulic cylinder to generate vibration excitation. The control system adjusts the hydraulic valve opening to control the hydraulic oil flow and pressure, thereby precisely controlling the piston's speed, displacement, and force to simulate different road surface excitation conditions. Servo-electric cylinder-only vehicle vibration testing systems employ a servo-electric cylinder that precisely controls the piston rod movement according to control system commands. A coil spring provides elastic support and cushioning, and the servo-electric cylinder's compression and stretching motion simulates vibration excitation.

[0003] The existing structures described above have certain drawbacks: in the hydraulic vehicle road spectrum simulation test system, the hydraulic system needs to continuously run the hydraulic pump to maintain pressure, resulting in high overall energy consumption and a large amount of maintenance work; in the servo electric cylinder vehicle road spectrum simulation test system, the motor not only needs to overcome the dynamic force of the vehicle's movement but also the vehicle's weight, requiring the use of a more powerful motor. The servo cylinder consumes a large amount of electrical energy during operation, and its power consumption is high during long-term, high-frequency vibration tests, increasing testing costs. When conducting high-load vehicle tests, its load-bearing capacity is limited, restricting its application scope.

[0004] Therefore, there is an urgent need to design a technical solution that can improve load-bearing capacity while minimizing servo motor power and reducing power consumption. Summary of the Invention

[0005] The purpose of this invention is to provide a vehicle road spectrum simulation experimental system and its control method to solve the problems existing in the prior art, improve the load-bearing capacity, and at the same time reduce the power of the servo motor and reduce power consumption.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a vehicle road spectrum simulation experimental system, comprising:

[0008] Multiple simulation device bodies, each of which is equipped with an electric bearing device and a pneumatic bearing device. The top of the electric bearing device and the pneumatic bearing device is connected to a bearing limiting platform, which is used to support the wheels of the vehicle.

[0009] The pneumatic interconnection bearing system is connected to multiple pneumatic bearing devices respectively, and is used to adjust the pneumatic pressure in each pneumatic bearing device;

[0010] The multi-servo motor drive control system is connected to multiple of the simulation device bodies, and can collect and receive displacement and load information of the bearing limit platform, and can control the working status of the electric bearing device and the pneumatic interconnected bearing system according to the collected information.

[0011] Preferably, the simulation device body includes a mechanical frame, within which the electric load-bearing device and the pneumatic load-bearing device are disposed; the electric push rod of the electric load-bearing device and the cylinder rod of the pneumatic load-bearing device both pass through the top of the mechanical frame and are connected to the load-bearing limiting platform located above the mechanical frame.

[0012] Preferably, a flexible limiting block is fixedly provided on the top of the mechanical frame, and the top of the flexible limiting block can abut against the bottom of the bearing limiting platform.

[0013] Preferably, the top of the load-bearing limiting platform is provided with a plurality of barriers that are connected end to end in sequence, and the inner side of the plurality of barriers forms a load-bearing area, which is used to bear the wheels of the vehicle.

[0014] Preferably, the electric load-bearing device includes a servo motor and a heavy-duty electric cylinder, wherein the servo motor is capable of controlling the extension and retraction of the electric push rod of the heavy-duty electric cylinder.

[0015] Preferably, the multi-servo motor drive control system includes a displacement sensor and a load sensor, wherein the displacement sensor is disposed on the electric push rod and the load sensor is disposed on the load-bearing limiting platform.

[0016] Preferably, the multi-servo motor drive control system further includes a computer, a real-time controller, a servo motor drive system, and a power distribution cabinet; the power distribution cabinet is used to provide power; the computer can receive displacement information and load information fed back by displacement sensors and load sensors, and generate control commands based on the received information; the real-time controller can receive real-time control commands issued by the computer, and control multiple servo motor drive systems according to the commands to make the electric load-bearing device drive the load-bearing limit platform to produce corresponding actions.

[0017] Preferably, the pneumatic bearing device includes a dual-chamber cylinder, which is externally connected to the pneumatic interconnected bearing system via a pipeline; the dual-chamber cylinder is provided with a piston, which divides the interior of the dual-chamber cylinder into an upper chamber and a lower chamber, and the piston is fixedly connected to the cylinder rod, with the end of the cylinder rod away from the piston passing through the top of the dual-chamber cylinder and connecting to the bearing limiting platform.

[0018] Preferably, the pneumatic interconnected load-bearing system includes an inflation device and an air tank. The inflation device is capable of filling the air tank with compressed air. The air tank is connected to two dual-chamber cylinders near the front wheels and two dual-chamber cylinders near the rear wheels of the vehicle via multiple gas pipelines. Each gas pipeline is equipped with a solenoid valve. The gas pipelines include a first gas pipeline, a second gas pipeline, a third gas pipeline, and a fourth gas pipeline. The solenoid valves include a first solenoid valve, a second solenoid valve, a third solenoid valve, and a fourth solenoid valve. The air tank is connected to the second gas pipeline and the third gas pipeline via the first gas pipeline. The two ends of the second gas pipeline are respectively connected to the two dual-chamber cylinders near the front wheels of the vehicle, and the two ends of the third gas pipeline are respectively connected to... The two dual-chamber cylinders near the rear wheel of the vehicle are connected; a first solenoid valve is provided on the third gas pipeline, a second solenoid valve is provided on the second gas pipeline, and a third solenoid valve is provided on the first gas pipeline, the third solenoid valve being located between the second gas pipeline and the third gas pipeline; a fourth gas pipeline is connected between the second gas pipeline and the third gas pipeline, the fourth gas pipeline is provided with a fourth solenoid valve, the first solenoid valve is provided at the position between the connection end of the third gas pipeline and the first gas pipeline and the connection end of the third gas pipeline and the fourth gas pipeline, and the second solenoid valve is provided at the position between the connection end of the second gas pipeline and the first gas pipeline and the connection end of the second gas pipeline and the fourth gas pipeline.

[0019] The present invention also provides a control method for the vehicle road spectrum simulation experimental system, comprising the following steps:

[0020] Step 1: The multi-servo motor drive control system starts the inflation device to compress air and fill the air tank. The real-time controller controls the load-bearing limit platform to rise to the middle position, which is half the height of the maximum position that the load-bearing limit platform can rise. At the same time, the solenoid valve is controlled to inject compressed gas into each dual-chamber cylinder to ensure that its thrust is equal to the weight of the vehicle being tested.

[0021] Step 2: The computer outputs motion data commands based on the set simulated working conditions. The real-time controller controls multiple servo motors to work synchronously based on the motion data commands, so that the displacement of the load-bearing limit platform at any time can follow the motion data commands issued by the computer.

[0022] Step 3: The displacement sensor and load sensor provide real-time feedback on the actual position and dynamic load information of the load-bearing limit platform. The real-time controller determines whether the air pressure of the dual-chamber cylinder is matched based on the motion data instructions from the computer and the feedback information from the displacement sensor and load sensor. When receiving motion data instructions of different amplitudes or facing different load distribution situations in the vehicle road spectrum simulation experiment system, the controller controls the multi-way solenoid valve to switch the circuit configuration of the gas pipeline to achieve balanced adjustment of the load-bearing capacity.

[0023] Step four: After the test, the real-time controller controls the load limit platform of the vehicle road spectrum simulation test system to descend to its lowest position, and at the same time controls the solenoid valve to completely discharge the compressed gas in the dual-chamber cylinder.

[0024] The present invention achieves the following technical effects compared to the prior art:

[0025] This invention achieves precise control of the load-bearing limiting platform's motion through a multi-servo motor drive control system, accurately simulating various vehicle motion postures under different road conditions and providing high-precision platform support for vehicle road spectrum simulation. Through the coordinated operation of the multi-servo motor drive control system and the pneumatic interconnected load-bearing system, the electric load-bearing device provides stable support to the load-bearing limiting platform. Simultaneously, the pneumatic interconnected load-bearing system inflates and deflates the pneumatic load-bearing device according to the displacement of the load-bearing limiting platform, ensuring sufficient and stable support for the load-bearing limiting platform under various motion states, meeting high load-bearing requirements. When the load-bearing limiting platform performs small-amplitude vertical, pitch, and lateral movements, the gas pressure balance of the pneumatic load-bearing device is achieved by controlling the opening and closing of different solenoid valves in the gas interconnection pipeline, reducing inflation and deflation operations, improving system stability, reducing energy consumption, and achieving low-power operation. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall layout of the vehicle road spectrum simulation experimental system in one or more embodiments of the present invention;

[0028] Figure 2 This is a schematic diagram of a vehicle road spectrum simulation experimental system in one or more embodiments of the present invention;

[0029] Figure 3 This is a schematic diagram of the control flow of a vehicle road spectrum simulation experimental system in one or more embodiments of the present invention;

[0030] Figure 4 This is a schematic diagram of the pipeline layout of a vehicle road spectrum simulation experimental system in one or more embodiments of the present invention.

[0031] Explanation of reference numerals in the attached drawings: 1-Gas tank; 2-Vehicle; 3-Simulation device body; 4-Power distribution cabinet; 5-Gas pipe circuit; 6-Solenoid valve; 7-Inflation device; 301-Bearing limit platform; 302-Mechanical frame; 303-Servo motor; 304-Load sensor; 305-Rubber limit block; 306-Displacement sensor; 307-Dual-chamber cylinder; 308-Heavy-duty electric cylinder. Detailed Implementation

[0032] 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 embodiments of the present invention, and not all embodiments. 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.

[0033] The purpose of this invention is to provide a vehicle road spectrum simulation experimental system and its control method to solve the problems existing in the prior art, improve the load-bearing capacity, and at the same time reduce the power of the servo motor and reduce power consumption.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] In existing technologies, single-powered testing devices consume a lot of power during long-term, high-frequency vibration testing, increasing testing costs. Furthermore, their load-bearing capacity is limited when conducting high-load vehicle testing, restricting their application scope. To address this issue, the first objective of this invention is to provide a vehicle road spectrum simulation experimental system, referencing... Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the system includes four simulation device bodies 3, each containing an electric load-bearing device and a pneumatic load-bearing device. A load-bearing limiting platform 301 is connected to the top of each of the electric and pneumatic load-bearing devices, and the load-bearing limiting platform 301 is used to support the wheels of the vehicle 2. A pneumatic interconnected load-bearing system is connected to each of the four pneumatic load-bearing devices to adjust the pneumatic pressure within each device. A multi-servo motor drive control system is connected to multiple simulation device bodies 3, capable of collecting and receiving displacement and load information from the load-bearing limiting platform 301, and controlling the operating state of the electric load-bearing device and the pneumatic interconnected load-bearing system based on the collected information. This invention achieves precise control of the movement of the load-bearing limiting platform 301 through a multi-servo motor drive control system, accurately simulating various movement postures of the vehicle 2 under different road conditions, and providing high-precision platform support for vehicle 2 road spectrum simulation. Through the coordinated operation of the multi-servo motor drive control system and the pneumatic interconnected load-bearing system, the electric load-bearing device provides stable support for the load-bearing limiting platform 301. Simultaneously, the pneumatic interconnected load-bearing system charges and deflates the pneumatic load-bearing device according to the displacement of the load-bearing limiting platform 301, ensuring sufficient and stable support for the load-bearing limiting platform 301 under various motion conditions, meeting high load-bearing requirements. When the load-bearing limiting platform 301 performs small-amplitude vertical, pitch, and lateral movements, the gas pressure balance of the pneumatic load-bearing device is achieved by controlling the opening and closing of different solenoid valves in the gas interconnection pipeline. This reduces the need for charging and deflation operations, improves system stability, and lowers energy consumption, achieving low-power operation.

[0036] In one embodiment, the simulation device body 3 includes a mechanical frame 302, which is equipped with an electric load-bearing device and a pneumatic load-bearing device. The mechanical frame 302 can provide protection for other structures of the experimental platform. The electric push rod of the electric load-bearing device and the cylinder rod of the pneumatic load-bearing device both pass through the top of the mechanical frame 302 and are connected to the load-bearing limiting platform 301 located above the mechanical frame 302. A flexible limiting block is fixedly provided on the top of the mechanical frame 302. The top of the flexible limiting block can abut against the bottom of the bearing limiting platform 301. In this embodiment, the flexible limiting block is a rubber limiting block 305. The rubber limiting block 305 is placed between the bearing limiting platform 301 and the mechanical frame 302 and is made of highly elastic and wear-resistant rubber material. When the heavy-duty electric cylinder 308 and the dual-chamber cylinder 307 are not working, it can buffer the pressure on the bearing limiting platform 301 in time to prevent the bearing limiting platform 301 from falling under pressure. Moreover, when the heavy-duty electric cylinder 308 and the dual-chamber cylinder 307 are malfunctioning, it can buffer the pressure on the bearing limiting platform 301 in time to prevent the bearing limiting platform 301 from falling under pressure and avoid damage to the heavy-duty electric cylinder 308, thus providing reliable safety protection for equipment operation.

[0037] In one embodiment, the top of the load-bearing limiting platform 301 is provided with a plurality of barriers connected end to end in sequence, and the inner side of the plurality of barriers forms a load-bearing area, which is used to bear the wheels of the vehicle 2.

[0038] In one embodiment, the electric load-bearing device includes a servo motor 303 and a heavy-duty electric cylinder 308. The heavy-duty electric cylinder 308 is prior art, so its structure and principle will not be described in detail. The servo motor 303 can control the extension and retraction of the electric push rod of the heavy-duty electric cylinder 308. Under the drive of the servo motor 303, the heavy-duty electric cylinder 308 accurately converts the rotational motion of the servo motor 303 into linear motion, supporting the load-bearing limiting platform 301, simulating the vertical displacement of the vehicle 2 caused by uneven road surfaces, etc., and providing accurate excitation conditions for the vehicle 2 test. The pneumatic load-bearing device includes a dual-chamber cylinder 307, which is externally connected to a pneumatic interconnected load-bearing system through pipelines. This invention employs a servo motor 303 for drive, and a collaborative working mode of a heavy-duty electric cylinder 308 and a dual-chamber cylinder 307. Compared to traditional testing systems, this invention overcomes the challenge of balancing high load capacity and low power consumption. By utilizing the servo motor 303 to drive the heavy-duty electric cylinder 308, precise control of the displacement of the load-bearing limiting platform 301 is achieved, while the inflation and deflation of the dual-chamber cylinder 307 provides collaborative support for the load-bearing limiting platform 301, significantly reducing energy consumption and increasing load capacity. This invention can simulate large or small amplitude vertical, pitch, and roll movements, providing a complex excitation testing environment for vehicle 2 that closely approximates real road conditions, effectively improving the reliability of test results. Furthermore, this invention can switch the working modes of multiple dual-chamber cylinders 307 according to the amplitude of the load-bearing limiting platform 301's movement. During small amplitude movements, the pressure is balanced through the air pipe circuit 5, ensuring system stability and further reducing energy waste.

[0039] In one embodiment, the multi-servo motor drive control system includes a computer, a real-time controller, a servo motor drive system, a power distribution cabinet 4, a displacement sensor 306, and a load sensor 304. The displacement sensor 306 is mounted on the electric push rod, and the load sensor 304 is mounted on the load-bearing limiting platform 301. The load sensor 304 can directly measure the load borne by the load-bearing limiting platform 301, accurately obtain the gravity of the test vehicle 2 and other dynamic load information, which facilitates the real-time controller to determine whether the air pressure of the dual-chamber cylinder 307 is matched, and thus rationally allocate the load-bearing tasks of the servo motor 303 and the dual-chamber cylinder 307. The displacement sensor 306 is used to monitor the extension and retraction displacement of the heavy-duty electric cylinder 308. Since the movement of the heavy-duty electric cylinder 308 is directly related to the accuracy of the simulated road surface excitation, monitoring its displacement can better achieve precise control of the up-and-down movement of the wheels caused by the unevenness of the simulated road surface. In this embodiment, the computer sets the target parameters for the up-and-down movement of the load-bearing limiting platform 301, such as position and speed, and sends the instructions to the controller, receives the displacement data from the displacement sensor 306, and simultaneously determines whether to perform an inflation / deflation operation on the dual-chamber cylinder 307. The real-time controller receives real-time control commands from the computer and controls multiple motor drivers to produce corresponding actions on the vehicle 2-channel spectrum simulation test platform. It sends displacement and force information from displacement sensors and load sensors 304 to the computer. Simultaneously, combining the computer's motion data commands and sensor feedback, it determines whether the air pressure of the dual-chamber cylinder 307 in the pneumatic interconnected load-bearing system is matched. When receiving motion data commands of different amplitudes or facing different load distributions in the vehicle 2-channel spectrum simulation test system, it controls the multi-way solenoid valves to switch the configuration of the air pipe circuit 5, achieving balanced adjustment of the system's load-bearing capacity. After the test, it controls the vehicle 2-channel spectrum simulation test system and the pneumatic interconnected load-bearing system to perform corresponding closing actions. Under the control of the real-time controller based on computer commands, the servo motor drive system drives the heavy-duty electric cylinder 308, causing the heavy-duty electric cylinder 308 to move up and down on the load-bearing limit structure, thus simulating the up-and-down movement of the wheels caused by uneven road surfaces. The power distribution cabinet 4 distributes power to the entire multi-servo motor drive control system and related equipment (such as servo motor drive system, real-time controller, inflation device 7, etc.) to ensure that each device can obtain a stable and appropriate power supply and ensure the normal operation of the system.

[0040] In one embodiment, the dual-chamber cylinder 307 is equipped with a piston that divides the interior of the dual-chamber cylinder 307 into an upper chamber and a lower chamber. A cylinder rod is fixedly connected to the piston, with the end of the cylinder rod away from the piston passing through the top of the dual-chamber cylinder 307 and connecting to the load-bearing limiting platform 301. In another embodiment, the cylinder barrel of the dual-chamber cylinder 307 is connected to the load-bearing limiting platform 301. Driven by the servo motor 303, the heavy-duty electric cylinder 308 provides dynamic support force to the load-bearing limiting platform 301. Simultaneously, the dual-chamber cylinder 307 changes its internal pressure P by inflation and deflation. With the cross-sectional area S remaining constant, according to the formula F = P·S (where F represents the force provided by the dual-chamber cylinder 307, P is the internal pressure of the dual-chamber cylinder 307, and S is the cross-sectional area of ​​the dual-chamber cylinder 307), the force F provided by the dual-chamber cylinder 307 changes accordingly, thereby assisting the heavy-duty electric cylinder 308 in providing sufficient support force to the load-bearing limiting platform 301.

[0041] The pneumatic interconnection load-bearing system of this embodiment includes an inflation device 7 and an air tank 1. The inflation device 7 uses an air pump or other existing air compression mechanism to compress air and fill the air tank 1, providing an air source reserve for the system and ensuring sufficient compressed air for inflation and deflation of the dual-chamber cylinder 307. The air tank 1 stores the air compressed by the inflation device 7, serving as an air source reserve container to provide a stable air source supply for inflation and deflation of the dual-chamber cylinder 307. The air pipe circuit 5 serves as a gas transmission channel, connecting the inflation device 7, the air tank 1, the dual-chamber cylinder 307, and each solenoid valve 6, allowing compressed air to flow in the system according to control requirements, achieving functions such as pneumatic interconnection, pressure balance, and balanced load-bearing capacity. The air pipe circuit 5 of this embodiment includes a first gas pipe, a second gas pipe, a third gas pipe, and a fourth gas pipe. The solenoid valves 6 on the air pipe circuit 5 include a first solenoid valve Z1, a second solenoid valve Z2, a third solenoid valve Z3, and a fourth solenoid valve. Z4, gas tank 1 is connected to a second gas pipeline and a third gas pipeline via a first gas pipeline. The two ends of the second gas pipeline are connected to two dual-chamber cylinders 307 near the front wheels of vehicle 2, and the two ends of the third gas pipeline are connected to two dual-chamber cylinders 307 near the rear wheels of vehicle 2. A first solenoid valve Z1 is installed on the third gas pipeline, a second solenoid valve Z2 is installed on the second gas pipeline, and a third solenoid valve Z3 is installed on the first gas pipeline. The third solenoid valve Z3 is located between the second gas pipeline and the third gas pipeline. A fourth gas pipeline is connected between the second gas pipeline and the third gas pipeline. A fourth solenoid valve Z4 is installed on the fourth gas pipeline. The first solenoid valve Z1 is located between the connection ends of the third gas pipeline and the first gas pipeline, and between the connection ends of the third gas pipeline and the fourth gas pipeline. The second solenoid valve Z2 is located between the connection ends of the second gas pipeline and the first gas pipeline, and between the connection ends of the second gas pipeline and the fourth gas pipeline.

[0042] The second objective of this invention is to provide a control method for a vehicle two-path spectrum simulation experimental system, comprising the following steps:

[0043] Step 1, System Start-up Preparation Stage: Start the inflation device 7, and fill the air tank 1 with compressed air. Control the solenoid valve to inject compressed gas into the dual-chamber cylinder 307. The working height of the dual-chamber cylinder 307 is the same as the non-energized height of the heavy-duty electric cylinder 308. The dual-chamber cylinder 307 assists the heavy-duty electric cylinder 308 in providing load-bearing capacity, so that the load-bearing capacity is approximately equal to the weight of the vehicle 2 under test.

[0044] Step 2, Operation and Control Stage: The computer uses existing human-computer interaction software to set motion data instructions. The real-time controller receives the motion data instructions and controls the servo motor drive system according to the instructions, so that multiple servo motors 303 work synchronously. The servo motors 303 drive the heavy-duty electric cylinders 308, which drive the load-bearing limit platform 301 to move up and down, simulating road surface excitation.

[0045] Step 3: Displacement sensor 306 provides real-time feedback on the actual position information of bearing limit platform 301, and load sensor 304 provides real-time feedback on the load information of bearing limit platform 301. The real-time controller combines the computer motion data command and sensor feedback information to determine whether the air pressure of the dual-chamber cylinder 307 in the pneumatic interconnected bearing system is matched. Under small amplitude command or small load distribution difference conditions, the real-time controller determines that it has received a small amplitude motion data command or the load distribution difference of the vehicle 2 road spectrum simulation test system is small. The real-time controller controls the multi-way solenoid valve to maintain the original circuit configuration of the air pipe. The servo motor 303 only provides the dynamic load of the tested vehicle 2. The static load is basically supported by the cylinder, reducing the power efficiency requirement. Under large amplitude command or large load distribution difference conditions, the real-time controller determines that it has received a large amplitude motion data command or the load distribution difference of the vehicle 2 road spectrum simulation test system is large. The real-time controller controls the multi-way solenoid valve to switch the air pipe circuit 5 configuration, rebalance the bearing capacity of the dual-chamber cylinder 307, ensure that the servo motor 303 is in rated condition, and reduce energy consumption.

[0046] Step 4, End of Test: The controller slowly lowers the load-bearing limit structure of the vehicle 2-channel spectrum simulation test system to the lowest position, and the controller controls the solenoid valve of the pneumatic interconnected load system to completely discharge the compressed gas.

[0047] Please refer to the schematic diagram of the interconnection pipeline layout of the pneumatic interconnection load-bearing system. Figure 4 .

[0048] The inflation device 7 compresses the air and fills the air tank 1 with the compressed air. The air tank 1 provides the system with an air source reserve. The gas in the dual-chamber cylinder 307 can also return to the air tank 1 through the pipeline, reducing the gas pressure in the dual-chamber cylinder 307 and thus adjusting the supporting force provided by the dual-chamber cylinder 307 to meet the movement requirements of the bearing limit platform 301.

[0049] During the simulation of large-amplitude vertical motion, the first solenoid valve Z1, the second solenoid valve Z2, the third solenoid valve Z3, and the fourth solenoid valve Z4 open selectively according to the system state, tracking the movement of the heavy-duty electric cylinder 308 while simultaneously charging and deflating a specific cylinder. During the simulation of large-amplitude pitch motion, the first solenoid valve Z1 and the second solenoid valve Z2 close, while the third solenoid valve Z3 and the fourth solenoid valve Z4 open, balancing the pressure through the interconnected chambers to reduce energy consumption. During the simulation of large-amplitude tilt motion, the first solenoid valve Z1 and the second solenoid valve Z2 open, while the third solenoid valve Z3 and the fourth solenoid valve Z4 close, balancing the pressure through the interconnected chambers to reduce energy consumption. During the simulation of small-amplitude vertical motion, all four solenoid valves are closed.

[0050] The specific application scenarios of the vehicle two-path spectrum simulation experimental system and its control method provided by this invention include, but are not limited to:

[0051] (1) Quarter-car test: The vehicle 2-road spectrum simulation experimental system has four dual-chamber cylinders 307. When testing the quarter-car suspension, the other three servo motors 303 can be put into non-working state, and only one servo motor 303 can be controlled to make the load plate move up and down to simulate the road spectrum. At this time, the corresponding suspension can be tested.

[0052] (2) Half-vehicle test: The vehicle 2-road spectrum simulation experimental system has four dual-chamber cylinders 307. When testing the half-vehicle suspension, the servo motor 303 on one side can be made to be in a non-working state, and only the two servo motors 303 on one side can be controlled to make the load-bearing limit platform 301 on the same side move up and down to simulate the road spectrum. At this time, the suspension on the corresponding side can be tested.

[0053] (3) Vehicle test: The vehicle 2 road spectrum simulation experimental system has four dual-chamber cylinders 307, which can move independently of each other. The test vehicle 2 can be placed on the test system as a whole, and the four servo motors 303 can be controlled to control the load limit platform 301 to move up and down to simulate the road spectrum.

[0054] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A vehicle road spectrum simulation experimental system, characterized in that: include: Multiple simulation device bodies, each of which is equipped with an electric bearing device and a pneumatic bearing device. The top of the electric bearing device and the pneumatic bearing device is connected to a bearing limiting platform, which is used to support the wheels of the vehicle. The pneumatic interconnection bearing system is connected to multiple pneumatic bearing devices respectively, and is used to adjust the pneumatic pressure in each pneumatic bearing device; The multi-servo motor drive control system is connected to multiple of the simulation device bodies, and can collect and receive displacement and load information of the bearing limit platform, and can control the working status of the electric bearing device and the pneumatic interconnected bearing system according to the collected information.

2. The vehicle road spectrum simulation experimental system according to claim 1, characterized in that: The simulation device body includes a mechanical frame, within which are the electric load-bearing device and the pneumatic load-bearing device; the electric push rod of the electric load-bearing device and the cylinder rod of the pneumatic load-bearing device both pass through the top of the mechanical frame and are connected to the load-bearing limiting platform located above the mechanical frame.

3. The vehicle road spectrum simulation experimental system according to claim 2, characterized in that: A flexible limiting block is fixedly provided on the top of the mechanical frame, and the top of the flexible limiting block can abut against the bottom of the bearing limiting platform.

4. The vehicle road spectrum simulation experimental system according to claim 1, characterized in that: The top of the load-bearing limiting platform is provided with multiple barriers connected end to end in sequence, and the inner side of the multiple barriers forms a load-bearing area, which is used to support the wheels of the vehicle.

5. The vehicle road spectrum simulation experimental system according to claim 2, characterized in that: The electric load-bearing device includes a servo motor and a heavy-duty electric cylinder. The servo motor can control the extension and retraction of the electric push rod of the heavy-duty electric cylinder.

6. The vehicle road spectrum simulation experimental system according to claim 2, characterized in that: The multi-servo motor drive control system includes a displacement sensor and a load sensor. The displacement sensor is mounted on the electric push rod, and the load sensor is mounted on the load-bearing limiting platform.

7. The vehicle road spectrum simulation experimental system according to claim 2, characterized in that: The multi-servo motor drive control system also includes a computer, a real-time controller, a servo motor drive system, and a power distribution cabinet; the power distribution cabinet is used to provide power; the computer can receive displacement and load information fed back by displacement sensors and load sensors, and generate control commands based on the received information; the real-time controller can receive real-time control commands issued by the computer, and control multiple servo motor drive systems according to the commands to make the electric load-bearing device drive the load-bearing limit platform to produce corresponding actions.

8. The vehicle road spectrum simulation experimental system according to claim 2, characterized in that: The pneumatic bearing device includes a dual-chamber cylinder, which is externally connected to the pneumatic interconnected bearing system via a pipeline. The dual-chamber cylinder is equipped with a piston that divides the interior of the dual-chamber cylinder into an upper chamber and a lower chamber. The piston is fixedly connected to the cylinder rod, and the end of the cylinder rod away from the piston passes through the top of the dual-chamber cylinder and is connected to the bearing limiting platform.

9. The vehicle road spectrum simulation experimental system according to claim 8, characterized in that: The pneumatic interconnected load-bearing system includes an inflation device and an air tank. The inflation device can fill the air tank with compressed air. The air tank is connected to two dual-chamber cylinders near the front wheels and two dual-chamber cylinders near the rear wheels of the vehicle through multiple gas pipelines. Each gas pipeline is equipped with a solenoid valve.

10. A control method for a vehicle road spectrum simulation experimental system as described in any one of claims 1 to 9, characterized in that: Includes the following steps: Step 1: The multi-servo motor drive control system starts the inflation device to compress air and fill the air tank. The real-time controller controls the load limit platform to rise to the middle position, and at the same time controls the solenoid valve to inject compressed gas into each dual-chamber cylinder to ensure that its thrust is equal to the weight of the vehicle under test. Step 2: The computer outputs motion data commands based on the set simulated working conditions. The real-time controller controls multiple servo motors to work synchronously based on the motion data commands, so that the displacement of the load-bearing limit platform at any time can follow the motion data commands issued by the computer. Step 3: The displacement sensor and load sensor provide real-time feedback on the actual position and dynamic load information of the load-bearing limit platform. The real-time controller determines whether the air pressure of the dual-chamber cylinder is matched based on the motion data instructions from the computer and the feedback information from the displacement sensor and load sensor. When receiving motion data instructions of different amplitudes or facing different load distribution situations in the vehicle road spectrum simulation experiment system, the controller controls the multi-way solenoid valve to switch the circuit configuration of the gas pipeline to achieve balanced adjustment of the load-bearing capacity. Step four: After the test, the real-time controller controls the load limit platform of the vehicle road spectrum simulation test system to descend to its lowest position, and at the same time controls the solenoid valve to completely discharge the compressed gas in the dual-chamber cylinder.

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