A fixing system for a hub test, a control method, a control system, and a hub test method

Abstract

The application provides a fixing system for a hub test, a control method, a control system and a hub test method, and relates to the technical field of hub tests. The fixing system for the hub test comprises at least one set of traction connecting pieces and height adjusting mechanisms, a detection system and a control system. One end of the traction connecting piece is connected with the height adjusting mechanism in the same set, and the other end is used for being connected with a test vehicle on a hub test table. The height adjusting mechanism is arranged on the hub test table and is used for adjusting the height of the connecting point of the traction connecting piece in the same set. The detection system is used for obtaining the height information of the connecting point of the test vehicle and the traction connecting piece. The control system is electrically connected with each height adjusting mechanism and the detection system, and is used for controlling the action of each height adjusting mechanism according to the height information obtained by the detection system, so that the height difference of the connecting points of the two ends of each traction connecting piece is within a preset range.

Description

Technical Field

[0001] This invention relates to the field of hub testing technology, and more specifically, to a hub testing fixture system, control method, control system, and hub testing method. Background Technology

[0002] During swivel testing, to prevent the test vehicle from slipping forward or backward off the swivel, it is typically secured longitudinally. Common securing methods include... Figure 1 As shown, a chain or lever is used for securing the vehicle: one end is connected to a fixed ground post, and the connection point remains stationary; the other end is connected to the vehicle body, typically attached to a tow hook. This method of securing the vehicle has significant drawbacks, as follows: 1. For vehicles equipped with active suspension, the suspension height will actively adjust with vehicle speed, causing dynamic changes in vehicle height and trailer hitch position (e.g., Figure 1 The vehicle body shifts from the solid line position to the dashed line position, causing the chain or tie rod to form a tension angle with the horizontal direction during the test, subjecting the test vehicle to additional vertical force on the rotating hub. This problem severely affects the accuracy of vehicle energy consumption test results and significantly reduces the reliability of test data; if the angle change is too large, it may also cause the chain or tie rod to break, leading to a serious safety accident.

[0003] 2. For vehicles without active suspension, the installation height of the trailer hitch varies depending on the vehicle model. During testing, the height of the fixing point on the iron post needs to be adjusted one by one for each vehicle to match the position of the trailer hitch. This cumbersome testing process directly reduces the overall testing efficiency. Summary of the Invention

[0004] The present invention aims to develop a vehicle fixing fixture with a high degree of automatic adjustment function to improve the accuracy, efficiency and safety of the rotating drum test.

[0005] To address the aforementioned problems, this invention provides a fixing system, control method, control system, and rotating hub testing method for a rotating hub test.

[0006] In a first aspect, the present invention provides a fixing system for a rotating hub test, comprising at least one set of traction connectors and a height adjustment mechanism, as well as a detection system and a control system; One end of the traction connector is connected to the height adjustment mechanism in the same group, and the other end is used to connect to the test vehicle on the rotating test bench. The height adjustment mechanism is located on the rotating test bench and is used to adjust the height of its connection point with the traction connector in the same group; The detection system is used to obtain the height information of the connection point between the test vehicle and the traction connector; The control system is electrically connected to each of the height adjustment mechanisms and the detection system, and is used to control the operation of each height adjustment mechanism according to the height information obtained by the detection system, so that the height difference between the connection points at both ends of each traction connector is within a preset range.

[0007] Optionally, at least two sets of the traction connectors and the height adjustment mechanism are respectively located at the front and rear of the test vehicle, and the traction connectors at the front or rear of the test vehicle are all connected to the same part of the test vehicle.

[0008] Optionally, when the test vehicle is not equipped with an active suspension system, the detection system is used to obtain the height information of any connection point between the test vehicle and the traction connector, and the control system controls the operation of each height adjustment mechanism according to the height information obtained by the detection system, including: the control system determines the height information of all connection points between the test vehicle and the traction connector according to the height information of the connection point; When the test vehicle is equipped with an active suspension system, the detection system is used to obtain the height information of all connection points between the test vehicle and the traction connector.

[0009] Optionally, the detection system includes a distance sensor, which is mounted on the rotating test bench and vertically upwards corresponding to a connection point between the test vehicle and the traction connector. The distance sensor is used to obtain the distance between itself and the corresponding connection point, which is the height information of the corresponding connection point.

[0010] Optionally, the number m of the ranging sensors satisfies: m=1 or m=n, where n is the number of connection points between the test vehicle and the traction connector; And / or, The detection system is also provided with a number of position adjustment mechanisms equal to the number of the ranging sensors. Each ranging sensor is mounted on the rotating test bench via a position adjustment mechanism. The position adjustment mechanism is used to adjust the corresponding ranging sensor in the horizontal plane.

[0011] Optionally, the height adjustment mechanism includes a column and a drive system; the column is slidably inserted into the rotating test bench in the vertical direction, and one end of the column is connected to the traction connector; the drive system is located on the rotating test bench and is configured to drive the column to move in the vertical direction.

[0012] Secondly, the present invention provides a control method, comprising the following steps: Obtain the current height of the connection points between each traction connector and the height adjustment mechanism; Obtain the current height of the connection points between each traction connector and the test vehicle; Determine whether the height difference between the two ends of each traction connector is within the preset range at the current moment. If the height difference between the two ends of any traction connector exceeds the preset range, control the corresponding height adjustment mechanism to adjust the height of the connection point between the traction connector and the height adjustment mechanism so that the height difference between the two ends of the traction connector falls within the preset range. The test vehicle is fixed to the rotating test bench by at least one set of traction connectors and height adjustment mechanism.

[0013] Optionally, obtaining the height of the connection point between each traction connector and the height adjustment mechanism at the current moment includes: Determine the initial height of the connection points between each traction connector and the height adjustment mechanism at the start of the test; Determine the total height adjustment amount of each traction connector and height adjustment mechanism connection point from the start of the test to the current time. The height of each traction connector and the height adjustment mechanism connection point at the current moment is determined based on the initial height of each traction connector and the connection point of the height adjustment mechanism, as well as the total height adjustment amount.

[0014] Optionally, the height adjustment mechanism is driven by a stepper motor; controlling the corresponding height adjustment mechanism to adjust the height of the connection point between the traction connector and the height adjustment mechanism, so that the height difference between the two connection points of the traction connector falls within a preset range includes: Based on the height difference between the two connection points of the traction connector at the current moment, calculate the rotation direction signal and the number of drive pulses of the stepper motor; The control system inputs rotation direction signals and drive pulse counts to the stepper motor of the corresponding height adjustment mechanism.

[0015] Thirdly, the present invention provides a system comprising: The first acquisition module is used to acquire the height of the connection point between each traction connector and the height adjustment mechanism at the current moment. The second acquisition module is used to acquire the height of the connection point between each traction connector and the test vehicle at the current moment. The control unit is used to determine whether the height difference between the two ends of each traction connector is within the preset range at the current moment. If the height difference between the two ends of any traction connector exceeds the preset range, the corresponding height adjustment mechanism is controlled to adjust the height of the connection point between the traction connector and the height adjustment mechanism so that the height difference between the two ends of the traction connector falls within the preset range. The test vehicle is fixed to the rotating test bench by at least one set of traction connectors and height adjustment mechanism.

[0016] Fourthly, the present invention provides a hub testing method based on the above-mentioned hub testing fixing system, comprising the following steps: The test vehicle was placed in the test position on the rotating test bench; Connect each traction connector to the test vehicle; Start the detection system and control system. The control system works to keep the height difference between the connection points at both ends of each traction connector within a preset range. Adjust the main body of each traction connector to be in a horizontal or pre-tensioned state to limit the test vehicle in the horizontal plane; Initiate testing on the test vehicle.

[0017] The advantages of the fixing system for the rotating hub test of the present invention are: One end of each traction connector is connected to the rotating test bench via a height adjustment mechanism in the same group, while the other end is connected to the test vehicle, thus creating a limiting constraint on the test vehicle and preventing it from moving or leaving the test position during testing. The control system can control the operation of each height adjustment mechanism based on the height information of the connection points on the test vehicle obtained by the detection system, so as to adjust the height of one end of each traction connector in the same group, keeping the height difference between the two connection points of each traction connector within a small preset range.

[0018] Using the aforementioned fixing system for the rotating hub test, during the test preparation phase, after the assembly of the traction connector, height adjustment mechanism, and test vehicle is completed, the detection and control systems are activated. The height of one end of the traction connector will be automatically adjusted to approach the height of the other end, quickly completing the initial fixing of the new test vehicle and effectively improving the efficiency of test preparation. During the test operation, the height of the connection points between each traction connector and the height adjustment mechanism can be adaptively adjusted in real time according to the height changes of the connection points on the vehicle side, so that the heights of both ends of the traction connector always tend to be consistent, ensuring that the main body of the traction connector remains basically horizontal.

[0019] For test vehicles equipped with active suspension, this hub test fixing system can prevent the traction connector from forming an angle with the horizontal direction during the test, thus avoiding additional vertical force. This makes the vehicle test conditions closer to the actual road driving conditions and effectively improves the test accuracy. At the same time, it can prevent the traction connector from breaking due to abnormal stress, eliminate safety hazards, and improve the safety of the entire test process. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the existing fixed system used for hub testing.

[0021] Figure 2 This is a schematic diagram of the use of the fixing system for the rotating hub test according to an embodiment of the present invention (a distance measuring sensor).

[0022] Figure 3 This is a top view of the fixing system for the hub test according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the use of the fixed system for the rotating hub test according to an embodiment of the present invention (two distance measuring sensors).

[0024] Figure 5 This is a schematic diagram of the distance measuring sensor arrangement structure of the fixed system for the rotating hub test according to an embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the height adjustment mechanism of the fixing system for the rotating hub test according to an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached drawings: 1. Traction connector; 2. Height adjustment mechanism; 21. Base; 22. Column; 23. Drive system; 24. Hanging ring; 3. Detection system; 31. Distance sensor; 32. Position adjustment mechanism; 321. First guide rail; 322. First drive mechanism; 323. Second guide rail; 324. Second drive mechanism; 4. Rotary test bench; 5. Test vehicle. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0028] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0029] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless explicitly stated otherwise in the context, they should be understood as "one or more". "Several" refers to one or more "one or more".

[0030] like Figure 2 As shown, this embodiment of the invention provides a fixing system for a rotating hub test, including at least one set of traction connectors 1 and height adjustment mechanisms 2, as well as a detection system 3 and a control system. One end of the traction connector 1 is connected to the height adjustment mechanism 2 of the same set, and the other end is used to connect to the test vehicle 5 on the rotating hub test bench 4. The height adjustment mechanism 2 is located on the rotating hub test bench 4 and is used to adjust the height of its connection point with the traction connector 1 of the same set. The detection system 3 is used to acquire the height information of the connection point between the test vehicle 5 and the traction connector 1. The control system is electrically connected to each height adjustment mechanism 2 and the detection system 3 respectively, and is used to control the action of each height adjustment mechanism 2 according to the height information acquired by the detection system 3, so that the height difference between the connection points at both ends of each traction connector 1 is within a preset range.

[0031] In this embodiment, one end of each traction connector 1 is connected to the rotating test bench 4 via a height adjustment mechanism 2 in the same group, and the other end is connected to the test vehicle 5, thereby forming a limiting constraint on the test vehicle 5 and preventing the test vehicle 5 from moving or leaving the test position during the test. The control system can control the operation of each height adjustment mechanism 2 according to the height information of the connection points on the test vehicle 5 obtained by the detection system 3, so as to adjust the height of one end of the traction connector 1 in the same group, and keep the height difference between the two connection points of each traction connector 1 within a small preset range.

[0032] Using the aforementioned fixing system for the rotating hub test, during the test preparation phase, after the assembly of the traction connector 1, the height adjustment mechanism 2, and the test vehicle 5 is completed, the detection system 3 and the control system are started. The height of one end of the traction connector 1 will be automatically adjusted to approach the height of the other end, quickly completing the initial fixing of the new test vehicle 5 and effectively improving the efficiency of test preparation. During the test operation, the height of the connection point between each traction connector 1 and the height adjustment mechanism 2 can be adaptively adjusted in real time according to the height change of the connection point on the vehicle side, so that the height of both ends of the traction connector 1 always tends to be consistent, ensuring that the main body of the traction connector 1 remains basically horizontal.

[0033] For the test vehicle 5 equipped with active suspension, the fixed system for the swivel test can prevent the traction connector 1 from forming an angle with the horizontal direction during the test, thus generating additional vertical force, making the test conditions of the vehicle closer to the actual road driving conditions and effectively improving the test accuracy; at the same time, it can prevent the traction connector 1 from breaking due to abnormal force, eliminating safety hazards and improving the safety of the entire test process.

[0034] In this embodiment, the preset range is a small height difference, which can be set to 5mm, meaning the height difference between the two ends of the traction connector 1 does not exceed 5mm. The traction connector 1 can be made of components such as iron chains or cables, preferably steel wire ropes with excellent toughness and tensile strength; it is connected to the body of the test vehicle 5, and the specific connection location can be the vehicle's tow hook or the frame. All the above heights are referenced to the same horizontal benchmark, for example, the platform of the rotating test bench 4 can be used as a unified benchmark plane.

[0035] It should be noted that only one set of traction connector 1 and height adjustment mechanism 2 can be provided, which is suitable for simple, low-speed, and temporary wheel rotation test scenarios. In basic tests with short duration, low vehicle speed, and low power, a single set of components can achieve basic positioning of the test vehicle 5, meeting the temporary fixing requirements for preventing forward lurching and jerking. Under normal test conditions, two or more sets of traction connector 1 and height adjustment mechanism 2 are provided, with each height adjustment mechanism 2 spaced apart, which can achieve reliable positioning of the test vehicle 5 in multiple horizontal directions, resulting in better fixing stability. At the start of the test, the traction connector 1 is in a horizontal or pre-tensioned state to ensure good positioning of the test vehicle 5 during the test.

[0036] Optionally, the control system includes a control unit, which may employ conventional control modules in the art, including but not limited to PLC programmable logic controllers, embedded microcontrollers, single-chip microcomputers, and industrial computers.

[0037] Optionally, such as Figure 2 and Figure 3 As shown, at least two sets of traction connectors 1 and height adjustment mechanisms 2 are respectively placed at the front and rear of the test vehicle 5, and the traction connectors 1 at the front or rear of the test vehicle 5 are all connected to the same part of the test vehicle 5.

[0038] In this optional embodiment, the main direction of movement of the test vehicle 5 during the hub test is the front-to-back direction. Therefore, at least two sets of traction connectors 1 and height adjustment mechanisms 2 are respectively provided at the front and rear ends of the vehicle to ensure the traction limiting effect.

[0039] Preferably, at least two height adjustment mechanisms 2 are located at the front or rear of the test vehicle 5, respectively on the left and right sides of the test vehicle 5. The left and right sides refer to the two sides of the vehicle body along the lateral direction of the test vehicle 5. This arrangement not only achieves front and rear limit of the test vehicle 5, but also forms reliable lateral limit, improving the stability of the fixation.

[0040] In addition, the specific location of the height adjustment mechanism 2 and the length of the traction connector 1 are designed according to the actual situation.

[0041] Optionally, when the test vehicle 5 is not equipped with an active suspension system, the detection system 3 is used to obtain the height information of any connection point between the test vehicle 5 and the traction connector 1, and the control system controls the actions of each height adjustment mechanism 2 according to the height information obtained by the detection system 3, including: the control system determines the height information of all connection points between the test vehicle 5 and the traction connector 1 according to the height information of the connection point. When the test vehicle 5 is equipped with an active suspension system, the detection system 3 is used to obtain the height information of all connection points between the test vehicle 5 and the traction connector 1.

[0042] In this optional embodiment, for the test vehicle 5 without an active suspension system, the height changes of various parts of the vehicle body are almost the same and the differences are minimal. Therefore, only the height information of any connection point can be collected. The control system characterizes the height changes of all connection points of the vehicle based on the height change of this single point and controls each height adjustment mechanism 2 to perform equal adjustments, so that the height difference between the two ends of each traction connector 1 is within a preset range.

[0043] For the test vehicle 5 equipped with an active suspension system, the height changes of different parts of the vehicle body are significantly different during the test. Therefore, it is necessary to collect independent height information of each connection point on the vehicle body. The control system adjusts independently according to the height of each traction connector 1 at both ends to accurately adapt to the height changes of each connection point.

[0044] It should be noted that some traction connectors 1 can be connected to the same part of the test vehicle 5, sharing the height information of that connection point. The active suspension system differs from the traditional passive suspension of "spring + shock absorber" by adaptively adjusting suspension stiffness, damping, and vehicle height in real time, balancing ultimate comfort and precise handling. Specifically, the active suspension system collects data from sensors such as vehicle posture, road conditions, vehicle speed, and steering / braking signals. This data is then calculated by the electronic control unit, driving actuators such as solenoid valves, air pumps, and hydraulic mechanisms to actively adjust suspension parameters, counteracting changes in vehicle posture such as bumps, roll, and pitch, ensuring the vehicle is always in optimal condition.

[0045] Optionally, such as Figure 2 As shown, the detection system 3 includes a distance sensor 31, which is mounted on the rotating test bench 4 and vertically upwards, corresponding to a connection point between the test vehicle 5 and the traction connector 1. The distance sensor 31 is used to obtain the distance between itself and the corresponding connection point, which is the height information of the corresponding connection point.

[0046] In this optional embodiment, the detection system 3 includes a distance sensor 31; the distance sensor 31 is vertically aligned with a connection point between the test vehicle 5 and the traction connector 1. By detecting the vertical distance, the height information of the corresponding connection point can be directly obtained, i.e., the height information of the connection point between the test vehicle 5 and the traction connector 1 can be obtained. Using the distance sensor 31 for detection is simple in structure, intuitive in detection, and convenient to implement.

[0047] Optionally, such as Figures 2-4 As shown, the number m of the ranging sensors 31 satisfies: m=1 or m=n, where n is the number of connection points between the test vehicle 5 and the traction connector 1.

[0048] In this optional embodiment, when the test vehicle 5 is not equipped with an active suspension system, the height changes of various parts of the vehicle body are basically the same or the differences are small during the test, so only one distance sensor 31 needs to be set. When the test vehicle 5 is equipped with an active suspension system, the height changes of various parts of the vehicle body are significantly different during the test, so a distance sensor 31 needs to be set for each connection point on the vehicle body.

[0049] like Figure 3 and Figure 4 As shown, the test vehicle 5 is equipped with two traction connectors 1 at the front and rear, respectively, and the traction connectors 1 in the front and rear directions are connected to the same connection point. Therefore, the number of connection points on the vehicle body is 2, and the number of height sensors 31 is also 2.

[0050] Optionally, such as Figure 2 As shown, the detection system 3 is also equipped with a number of position adjustment mechanisms 32 equal to the number of distance sensors 31. Each distance sensor 31 is mounted on the rotating test bench 4 via a position adjustment mechanism 32. The position adjustment mechanism 32 is used to adjust the corresponding distance sensor 31 in the horizontal plane.

[0051] In this optional embodiment, each ranging sensor 31 is equipped with a corresponding position adjustment mechanism 32, which can adjust the installation position of the ranging sensor 31 on the rotating test bench 4 to ensure that the ranging sensor 31 is vertically aligned with the corresponding connection point of the test vehicle 5. When changing different test vehicles 5, the position can be finely adjusted through the position adjustment mechanism 32 to improve the adaptability and versatility of the device.

[0052] Preferably, the position adjustment mechanism 32 adopts a two-dimensional planar adjustment mechanism. Specifically, such as... Figure 5As shown, the position adjustment mechanism 32 may include two first guide rails 321, a first drive mechanism 322, a second guide rail 323, and a second drive mechanism 324; the two first guide rails 321 are arranged in parallel, the second guide rail 323 is disposed on the two first guide rails 321, and the three form an I-shaped structure; the ranging sensor 31 is disposed on the second guide rail 323, the first drive mechanism 322 can drive the second guide rail 323 to slide along the first guide rail 321, and the second drive mechanism 324 can drive the ranging sensor 31 to slide along the second guide rail 323.

[0053] Preferably, the ranging sensor 31 is a laser ranging sensor; a high diffuse reflectivity patch is provided at the connection point between the test vehicle 5 and the traction connector 1 to improve the ranging accuracy.

[0054] Optionally, such as Figure 2 and Figure 6 As shown, the height adjustment mechanism 2 includes a column 22 and a drive system 23; the column 22 is slidably inserted into the rotating test bench 4 in the vertical direction, and one end of the column 22 is connected to the traction connector 1; the drive system 23 is located on the rotating test bench 4 and is configured to drive the column 22 to move in the vertical direction.

[0055] Preferably, the column 22 and the drive system 23 are both located on the base 21, and the base 21 is connected to the rotating test bench 4.

[0056] In this optional embodiment, the height adjustment mechanism 2 adopts a structure combining a base 21, a vertically movable column 22, and a drive system 23. This structure is simple, compact, stable, reliable, and easy to assemble and maintain. The drive system 23 drives the column 22 to rise and fall vertically, precisely and stably adjusting the height of the connection point of the traction connector 1. Specifically, the drive system 23 can adopt common structural forms such as electric screw lifting mechanisms or rack and pinion lifting mechanisms.

[0057] Preferably, such as Figure 6 As shown, the drive system 23 includes a stepper motor, gears, and a rack located on the bottom side wall of the column 22; the output end of the stepper motor directly drives the gears, and the gears mesh with the rack for transmission; the use of a stepper motor allows for precise micro-adjustment of the height, and the gear and rack transmission has high accuracy and strong load-bearing capacity. The column 22 is provided with a hanging ring 24 for convenient connection to the end of the traction connector 1.

[0058] Another embodiment of the present invention provides a control method, including steps S10 to S30, which is used by a test vehicle 5 during a hub test on a hub test bench 4. The test vehicle 5 is fixed to the hub test bench 4 by at least one set of traction connectors 1 and a height adjustment mechanism 2. This control method can be based on the above-described hub test fixing system and has the same technical improvements and effects as the hub test fixing system.

[0059] Step S10: Obtain the current height of the connection points between each traction connector 1 and the height adjustment mechanism 2. The specific methods for obtaining this height include the following two: Firstly, a structure similar to the aforementioned detection system 3 can be adopted, such as a distance sensor 31 or other detection element, to directly detect the height of the connection point in real time. Secondly, the height can be indirectly obtained through calculation: the aforementioned control system is electrically connected to the height adjustment mechanism 2 and forms a control coordination, and the height can be calculated based on the driving parameters and transmission relationship; for example, when the height adjustment mechanism 2 is driven by a stepper motor, the control system can calculate the current height of the connection point based on the cumulative count of stepper motor pulses and the preset transmission ratio parameters.

[0060] Optionally, the height of each traction connector 1 and the height adjustment mechanism 2 at the current moment is obtained indirectly through calculation, including the following steps S11~S13, which are combined with the following... Figure 6 The height adjustment mechanism 2 shown is described in detail.

[0061] like Figure 6 As shown, the height adjustment mechanism 2 includes a column 22 and a drive system 23. The column 22 is slidably inserted into the rotating test bench 4 in the vertical direction, and one end of the column 22 is connected to the traction connector 1. The drive system 23 is located on the rotating test bench 4 and is configured to drive the column 22 to move in the vertical direction. The drive system 23 includes a stepper motor, a gear, and a rack located on the bottom side wall of the column 22. The output end of the stepper motor directly drives the gear, and the gear meshes with the rack for transmission.

[0062] During the test, the stepper motor receives the pulse drive signal from the control system, rotates precisely in steps according to the set angle, and drives the gear to rotate synchronously; the gear meshes with the rack on the column 22, converting the rotational motion of the stepper motor into the vertical linear motion of the column 22, thereby driving the column 22 and the connection point on it to rise and fall.

[0063] The height adjustment mechanism 2 driven by a stepper motor typically establishes an absolute position reference by mechanically limiting and returning to zero, and calculates the height of the column 22 in real time by accumulating pulse counts. By controlling the number of pulses and the rotation direction of the stepper motor, the lifting displacement and movement direction of the column 22 can be precisely controlled. By recording the number and direction of pulses, the height position of the column 22 and the connection point can be calculated in real time.

[0064] Step S11: Determine the initial height of the connection points between each traction connector 1 and the height adjustment mechanism 2 at the start of the test. The start time of the test refers to the moment when the test vehicle 5 starts and begins the wheel rotation test, excluding the test preparation stage.

[0065] During the test preparation phase, due to the different models of the test vehicles 5, the heights of the connection points between each traction connector 1 and the test vehicle 5 are different. Therefore, the initial heights of the connection points between each traction connector 1 and the height adjustment mechanism 2 need to be adjusted adaptively to ensure that the height difference between the connection points at both ends of each traction connector 1 is within the preset range at the start of the test.

[0066] Specifically, during the test preparation phase, the traction connector 1 is connected between the height adjustment mechanism 2 and the test vehicle 5. After the control system is powered on for the first time, it will establish an absolute position reference by using a mechanical limit switch to return to zero. After the control system is powered on for the first time, the stepper motor rotates until a mechanical limit switch is triggered. The control system then clears its internal "position counter," meaning the pulse count is zero. At this point, the system is at the absolute position reference point, corresponding to a height of H0 at the connection point on the column 22. This step is an initial operation and is only performed after the system is powered on for the first time; it will not be executed again afterward. The position counter will accumulate pulses. The calculation method is as follows: for each positive pulse issued by the control system, the position counter increments by 1; for each negative pulse issued, the counter decrements by 1.

[0067] During the test preparation phase, after the control system is initially powered on and establishes an absolute position reference using mechanical limit homing, the control system controls each height adjustment mechanism 2 based on the height information obtained by the detection system 3, ensuring that the height difference between the connection points at both ends of each traction connector 1 is within a preset range. At this time, the height of the connection point of the column 22 is uniformly marked as H1, which is the initial height of the connection point between each traction connector 1 and the height adjustment mechanism 2 at the start of the test. Subsequently, manual or machine adjustments are made to ensure that the main body of each traction connector 1 is in a horizontal or pre-tensioned state, thereby achieving the limitation of the test vehicle 5 in the horizontal plane and completing the test preparation.

[0068] The height H1 of a single column 22 connection point can be calculated by the control system based on the number of drive pulses during the test preparation phase, using H0 as a basis.

[0069] In the formula, X is the cumulative number of pulses during the test preparation stage; D is the step angle in degrees; π is pi; r is the gear pitch circle radius in meters; and W is the microstepping value of the stepper motor.

[0070] Step S12: Determine the total height adjustment amount of each traction connector 1 and height adjustment mechanism 2 connection point from the start time of the test to the current time.

[0071] The control system independently accumulates and counts the drive pulses from the start of the test to the current time, and then calculates the total height adjustment amount of each traction connector 1 and height adjustment mechanism 2 connection point from the start of the test to the current time.

[0072] Specifically, the formula for calculating the total height adjustment Hc of the connection point between a single traction connector 1 and the height adjustment mechanism 2 from the start of the test to the present time is as follows:

[0073] In the formula, X is the cumulative number of pulses from the start of the test to the current time; D is the step angle in degrees; π is pi; r is the pitch circle radius of the gear in meters; and W is the microstepping of the stepper motor.

[0074] Step S13: Determine the current height of the connection points between each traction connector 1 and the height adjustment mechanism 2 based on the initial height of each connection point and the total height adjustment amount.

[0075] The formula for calculating the height Ht of the connection point between a single traction connector 1 and the height adjustment mechanism 2 at the current moment is:

[0076] Step S20: Obtain the height of the connection points between each traction connector 1 and the test vehicle 5 at the current moment.

[0077] Specifically, a distance sensor installed on the rotating test bench 4 can measure the distance between the connection point of each traction connector 1 and the test vehicle 5 and the rotating test bench 4 at the current moment, thereby obtaining the height of the connection point of each traction connector 1 and the test vehicle 5 at the current moment. For example, a detection element such as a distance sensor 31 similar to the aforementioned detection system 3 can be used to obtain the height information of the connection point between the test vehicle 5 and the traction connector 1 in real time, so that the control system can calculate and determine the height of the connection point of each traction connector 1 and the test vehicle 5 at the current moment.

[0078] Taking the laser rangefinder sensor 31 as an example, the formula for calculating the height Hk of the connection point between each traction connector 1 and the test vehicle 5 at the current moment is:

[0079] In the formula, c is the speed of light, and its value is... m / s; is the phase difference between the transmitted and received signals, in rad; f is the modulation frequency of the laser, in Hz.

[0080] Step S30: Determine whether the height difference between the two ends of each traction connector 1 is within the preset range at the current moment. If the height difference between the two ends of any traction connector 1 exceeds the preset range, control the corresponding height adjustment mechanism 2 to adjust the height of the connection point between the traction connector 1 and the height adjustment mechanism 2 so that the height difference between the two ends of the traction connector 1 falls within the preset range.

[0081] The formula for determining whether the height difference between the two connection points of a single traction connector 1 is within a preset range at the current moment is as follows: ; In the formula, This refers to the current height of the connection point between the traction connector 1 and the height adjustment mechanism 2. This represents the current height of the connection point between the traction connector 1 and the test vehicle 5. The maximum value within a preset range, which is 0~ .

[0082] If the judgment formula is true, then the height difference between the two connection points of the traction connector 1 at the current moment falls within the preset range, and the corresponding height adjustment mechanism 2 does not need to be adjusted; otherwise, it needs to be adjusted.

[0083] The specific adjustment method includes the following steps S31 to S32. Taking the stepper motor drive as an example, the height adjustment mechanism 2 is adjusted by controlling the drive pulse of the stepper motor to adjust the height of the connection point with the traction connector 1.

[0084] Step S31: Calculate the rotation direction signal and drive pulse number of the stepper motor based on the height difference between the two connection points of the traction connector 1 at the current moment.

[0085] Specifically, the direction signal is calculated as follows: The inequality < 0 holds true, indicating a positive direction signal. Figure 3 The middle gear rotates clockwise; The inequality ≥ 0 is not true, the direction signal is negative. Figure 3 The middle gear rotates counterclockwise.

[0086] Pulse count calculation:

[0087] In the formula, Y is the cumulative number of pulses that the stepper motor needs to adjust at the current moment; D is the step angle in degrees; π is pi; r is the gear pitch circle radius in meters; and W is the microstepping value of the stepper motor. Step S32: The control system inputs the rotation direction signal and the number of drive pulses to the stepper motor of the corresponding height adjustment mechanism 2.

[0088] The stepper motor of the corresponding height adjustment mechanism 2 will perform actions according to the direction signal and pulse number input by the control system, and drive the lifting column to move vertically through gear and rack transmission to complete the height adjustment of the corresponding connection point.

[0089] It should be noted that the connection point heights mentioned above are all relative to the same horizontal reference. When controlling the height adjustment mechanism 2, the height difference between the two ends of the traction connector 1 and the connection points of the test vehicle 5 and the height adjustment mechanism 2 at the same moment is compared with the preset range. In this embodiment, the step numbers mentioned above are only used to clearly distinguish each step and do not limit the execution order of each step.

[0090] Another embodiment of the present invention provides a control system including a first acquisition module, a second acquisition module, and a control unit. This control system is used by a test vehicle 5 during a hub test on a hub test bench 4. The test vehicle 5 is fixed to the hub test bench 4 by at least one set of traction connectors 1 and a height adjustment mechanism 2. This control system can be based on the control method described above and has the same technical improvements and effects as the control method.

[0091] The first acquisition module is used to acquire the height of the connection points between each traction connector 1 and the height adjustment mechanism 2 at the current moment. Similarly, the specific acquisition methods include the following two: Firstly, a structure similar to the aforementioned detection system 3 can be adopted, such as a distance sensor 31 or other detection element, to directly detect the height of the connection point in real time. Secondly, the height can be indirectly obtained through calculation: the aforementioned control system is electrically connected to the height adjustment mechanism 2 and forms a control coordination, and the height can be calculated based on the driving parameters and transmission relationship; for example, when the height adjustment mechanism 2 is driven by a stepper motor, the control system can calculate the current height of the connection point based on the cumulative count of stepper motor pulses and the preset transmission ratio parameters.

[0092] The second acquisition module is used to obtain the height of the connection point between each traction connector 1 and the test vehicle 5 at the current moment. Specifically, it can use a distance measuring sensor installed on the rotating test bench 4 to measure the distance between the connection point between each traction connector 1 and the test vehicle 5 and the rotating test bench 4 at the current moment, thereby obtaining the height of the connection point between each traction connector 1 and the test vehicle 5 at the current moment.

[0093] The control unit is used to determine whether the height difference between the two ends of each traction connector 1 is within the preset range at the current moment. If the height difference between the two ends of any traction connector 1 exceeds the preset range, the corresponding height adjustment mechanism 2 is controlled to adjust the height of the connection point between the traction connector 1 and the height adjustment mechanism 2 so that the height difference between the two ends of the traction connector 1 falls within the preset range.

[0094] The formula for determining whether the height difference between the two connection points of a single traction connector 1 is within a preset range at the current moment is as follows: ; In the formula, This refers to the current height of the connection point between the traction connector 1 and the height adjustment mechanism 2. This represents the current height of the connection point between the traction connector 1 and the test vehicle 5. The maximum value within a preset range, which is 0~ .

[0095] If the judgment formula is true, then the height difference between the two connection points of the traction connector 1 at the current moment falls within the preset range, and the corresponding height adjustment mechanism 2 does not need to be adjusted; otherwise, it needs to be adjusted.

[0096] Another embodiment of the present invention provides a hub test method, based on the above-described hub test fixing system, including the following steps Z10 to Z50.

[0097] Step Z10: Place the test vehicle 5 on the test station of the rotating test bench 4.

[0098] Step Z20: Connect each traction connector 1 to the test vehicle 5. Usually, one end of the traction connector 1 is already connected to the height adjustment mechanism 2 of the same group. Manually connect the other end to the preset connection point of the test vehicle 5, preferably the vehicle trailer hook position.

[0099] Step Z30: Start the detection system 3 and the control system. The control system works to ensure that the height difference between the connection points at both ends of each traction connector 1 is within the preset range.

[0100] The detection system 3 and control system are started. The detection system 3 acquires the height information of the connection point between the test vehicle 5 and the traction connector 1 and transmits it to the control system. The control system determines whether the height difference between the two connection points of each traction connector 1 is within the preset range at the current moment. If the height difference between the two connection points of any traction connector 1 exceeds the preset range, the corresponding height adjustment mechanism 2 is controlled to adjust the height of the connection point between the traction connector 1 and the height adjustment mechanism 2 so that the height difference between the two connection points of the traction connector 1 falls within the preset range.

[0101] It should be noted that we are currently in the test preparation stage. The control system usually establishes the absolute position reference by mechanical limit return to zero and calculates the height of column 22 in real time by pulse cumulative counting.

[0102] Step Z40: Adjust each traction connector 1 to be in a horizontal or pre-tensioned state, thereby limiting the test vehicle 5 in the horizontal plane. Each traction connector 1 can be adjusted to a horizontal or pre-tensioned state manually or with auxiliary equipment. This completes the test preparation stage.

[0103] Step Z50: Start the hub rotation test of test vehicle 5.

[0104] It should be noted that the connection point heights mentioned above are all relative to the same horizontal reference. When controlling the height adjustment mechanism 2, the height difference between the two ends of the traction connector 1 and the connection points of the test vehicle 5 and the height adjustment mechanism 2 at the same moment is compared with the preset range. In this embodiment, the step numbers mentioned above are only used to clearly distinguish each step and do not limit the execution order of each step.

[0105] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A fixing system for a rotating hub test, characterized in that, It includes at least one set of traction connectors (1) and height adjustment mechanism (2), as well as detection system (3) and control system; One end of the traction connector (1) is connected to the height adjustment mechanism (2) in the same group, and the other end is used to connect to the test vehicle (5) on the rotating test bench (4); The height adjustment mechanism (2) is located on the rotating test bench (4) and is used to adjust the height of its connection point with the traction connector (1) in the same group; The detection system (3) is used to obtain the height information of the connection point between the test vehicle (5) and the traction connector (1); The control system is electrically connected to each of the height adjustment mechanisms (2) and the detection system (3) respectively, and is used to control the operation of each of the height adjustment mechanisms (2) according to the height information obtained by the detection system (3), so that the height difference between the two ends of each of the traction connectors (1) is within a preset range.

2. The fixing system for the rotating hub test according to claim 1, characterized in that, At least two sets of the traction connectors (1) and the height adjustment mechanism (2) are respectively placed at the front and rear of the test vehicle (5), and the traction connectors (1) at the front or rear of the test vehicle (5) are all connected to the same part of the test vehicle (5).

3. The fixing system for the rotating hub test according to claim 1, characterized in that, When the test vehicle (5) is not equipped with an active suspension system, the detection system (3) is used to obtain the height information of any connection point between the test vehicle (5) and the traction connector (1), and the control system controls the operation of each height adjustment mechanism (2) according to the height information obtained by the detection system (3), including: the control system determines the height information of all connection points between the test vehicle (5) and the traction connector (1) according to the height information of the connection point; When the test vehicle (5) is equipped with an active suspension system, the detection system (3) is used to obtain the height information of all connection points between the test vehicle (5) and the traction connector (1).

4. The fixing system for the rotating hub test according to claim 3, characterized in that, The detection system (3) includes a distance sensor (31), which is located on the rotating test bench (4) and vertically upwards corresponding to a connection point between the test vehicle (5) and the traction connector (1). The distance sensor (31) is used to obtain the distance between itself and the corresponding connection point, which is the height information of the corresponding connection point.

5. The fixing system for the rotating hub test according to claim 4, characterized in that, The number m of the ranging sensors (31) satisfies: m=1 or m=n, where n is the number of connection points between the test vehicle (5) and the traction connector (1); And / or, The detection system (3) is also provided with the same number of position adjustment mechanisms (32) as the distance sensors (31). Each distance sensor (31) is respectively set on the rotating test bench (4) through a position adjustment mechanism (32). The position adjustment mechanism (32) is used to adjust the corresponding distance sensor (31) in the horizontal plane.

6. The fixing system for the rotating hub test according to claim 1, characterized in that, The height adjustment mechanism (2) includes a column (22) and a drive system (23); the column (22) is slidably inserted into the rotating test bench (4) in the vertical direction, and the column (22) is connected to one end of the traction connector (1); the drive system (23) is located on the rotating test bench (4) and is configured to drive the column (22) to move in the vertical direction.

7. A control method, characterized in that, Includes the following steps: Obtain the current height of the connection points between each traction connector (1) and the height adjustment mechanism (2); Obtain the height of the connection point between each traction connector (1) and the test vehicle (5) at the current moment; Determine whether the height difference between the two ends of each traction connector (1) is within the preset range at the current moment. If the height difference between the two ends of any traction connector (1) exceeds the preset range, control the corresponding height adjustment mechanism (2) to adjust the height of the connection point between the traction connector (1) and the height adjustment mechanism (2) so that the height difference between the two ends of the traction connector (1) falls within the preset range. The test vehicle (5) is fixed to the rotating test bench (4) by at least one set of traction connectors (1) and height adjustment mechanism (2).

8. The control method according to claim 7, characterized in that, The process of obtaining the height of the connection points between each traction connector (1) and the height adjustment mechanism (2) at the current moment includes: Determine the initial height of the connection points between each traction connector (1) and the height adjustment mechanism (2) at the start of the test; Determine the total height adjustment amount of each traction connector (1) and height adjustment mechanism (2) connection point from the start of the test to the current time; Based on the initial height of the connection point between each traction connector (1) and the height adjustment mechanism (2), and the total height adjustment amount, determine the height of the connection point between each traction connector (1) and the height adjustment mechanism (2) at the current moment.

9. The control method according to claim 7, characterized in that, The height adjustment mechanism (2) is driven by a stepper motor; the control of the corresponding height adjustment mechanism (2) to adjust the height of the connection point between the traction connector (1) and the height adjustment mechanism (2) so that the height difference between the two connection points of the traction connector (1) falls within a preset range includes: Based on the height difference between the two connection points of the traction connector (1) at the current moment, calculate the rotation direction signal and the number of drive pulses of the stepper motor; The control system inputs the rotation direction signal and the number of drive pulses to the stepper motor of the corresponding height adjustment mechanism (2).

10. A control system, characterized in that, include: The first acquisition module is used to acquire the height of the connection point between each traction connector (1) and the height adjustment mechanism (2) at the current moment; The second acquisition module is used to acquire the height of the connection point between each traction connector (1) and the test vehicle (5) at the current moment; The control unit is used to determine whether the height difference between the two ends of each traction connector (1) is within the preset range at the current moment. If the height difference between the two ends of any traction connector (1) exceeds the preset range, the corresponding height adjustment mechanism (2) is controlled to adjust the height of the connection point between the traction connector (1) and the height adjustment mechanism (2) so that the height difference between the two ends of the traction connector (1) falls within the preset range. The test vehicle (5) is fixed to the rotating test bench (4) by at least one set of traction connectors (1) and height adjustment mechanism (2).

11. A method for testing a rotating hub, characterized in that, The fixing system for the rotating hub test according to any one of claims 1 to 6 includes the following steps: Place the test vehicle (5) in the test position of the rotating test bench (4); Connect each traction connector (1) to the test vehicle (5); Start the detection system (3) and control system. The control system works to keep the height difference between the two ends of each traction connector (1) within a preset range. Adjust the main body of each of the traction connectors (1) to be in a horizontal or pre-tensioned state, thereby limiting the test vehicle (5) in the horizontal plane; Initiate the test on the test vehicle (5).

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