Automobile door stopper comprehensive detection tooling
By designing a comprehensive testing fixture for automotive door limiters, a motor-driven telescopic device and movable rod are used to simulate the door opening and closing process. Combined with a multi-parameter testing system, this solves the problem that traditional testing equipment cannot simulate actual usage scenarios, and achieves efficient and accurate performance evaluation and durability testing of limiters.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- EDSCHA AUTOMOTIVE COMPONENTS KUNSHAN
- Filing Date
- 2026-03-30
- Publication Date
- 2026-06-12
AI Technical Summary
Traditional door limiter testing equipment cannot simulate the actual pushing and pulling scenario of a door during use, resulting in discrepancies between the test results and actual usage.
A comprehensive testing fixture for automotive door limiters was designed, comprising a motor, a telescopic member, a fixed rod, and a movable rod. The fixture tests the limiter performance by simulating the door opening and closing process and is equipped with a torque acquisition module, an abnormal noise acquisition module, and a force acquisition module for multi-parameter comprehensive analysis.
It enables a comprehensive evaluation of the performance of door limiters, improves the accuracy and adaptability of test results, can simulate actual usage scenarios, and provides test results that are closer to reality, and has durability testing capabilities.
Smart Images
Figure CN122192789A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of testing tooling technology, and in particular to a comprehensive testing tooling for automobile door limiters. Background Technology
[0002] The car door limiter is a key component that ensures the normal opening and closing of the car door and limits the opening degree of the door. Its performance directly affects the safety and comfort of using the car door.
[0003] Currently, traditional door limiter testing equipment has the following shortcomings: during the testing process, most tests only on the limiter, making it difficult to simulate real-world scenarios such as pushing and pulling of the door during actual use, resulting in discrepancies between the test results and actual usage. Therefore, corresponding improvements have been made to address this issue. Summary of the Invention
[0004] Based on the technical problems existing in the prior art, this invention proposes a comprehensive testing fixture for automobile door limiters.
[0005] The present invention proposes a comprehensive testing fixture for automotive door limiters, comprising a motor mount, a motor, a telescopic device, a fixed rod, and a movable rod. The motor is installed inside the motor mount. One end of the telescopic device is fixedly connected to the output shaft of the motor, and the other end is fixedly connected to the fixed rod. The movable rod is rotatably connected to the free end of the fixed rod for pushing and pulling the car door. The free end of the movable rod has a pre-drilled hole. The movable rod and the car door are connected by wrapping a strap around the pre-drilled hole and the inner armrest of the car door. Then, the motor is started to drive the output shaft to rotate, causing the telescopic device to extend and retract. This, in turn, causes the movable rod to move through the fixed rod, thus enabling the push-pull operation of the car door. This simulates the car door opening and closing process to test the performance of the limiter. Furthermore, this testing fixture can also simultaneously perform durability testing on the car door.
[0006] Preferably, the telescopic device includes a sleeve, an inner column, a guide column, and a screw. The sleeve is fitted onto the top of the inner column, the guide column is fixedly connected to the side of the inner column and slidably connected to the sleeve, and the screw is rotatably connected to the side of the inner column and threadedly connected to the sleeve. When the screw is rotated, the sleeve moves axially along the inner column under the threaded engagement between the screw and the sleeve. The guide column and the sleeve slide to ensure that the sleeve moves smoothly without deviation, thereby realizing the length adjustment of the telescopic device to adjust the movable rod to a position close to the height of the inner armrest of the car door.
[0007] Preferably, the assembly further includes a lifting component, which comprises a mounting plate, a drive shaft, a fixed plate, a pull ring, a first bevel gear, a second bevel gear, a ratchet, a connecting rod, a locating pin, and a cover. The mounting plate is fixedly connected to the top of the motor base, the drive shaft is rotatably connected to the mounting plate, the first bevel gear is fixedly mounted on the end of the drive shaft, the second bevel gear is fixedly mounted on the output shaft of the motor and meshes with the first bevel gear, the ratchet is fixedly mounted on the drive shaft, the connecting rod is sleeved on one end of the locating pin, the fixed plate is fixedly mounted on the other end of the locating pin, the pull ring is fixedly connected to the free end of the fixed plate, the end of the connecting rod abuts against the edge of the ratchet, and the connecting rod and the mounting plate form a [missing information - likely a specific shape or structure]. The system is elastically connected, with the cover fixedly connected to the top of the mounting plate and covering the ratchet. First, the two ends of the pull rope or strap are tied to the pull ring and the inside door handle, respectively. The motor output shaft rotates, driving the second bevel gear to rotate. Through the meshing transmission of the first and second bevel gears, the transmission shaft and ratchet rotate. When the ratchet rotates, it pushes the connecting rod to rotate. The connecting rod drives the positioning pin, the fixing plate, and the pull ring to move. Then, the pull ring pulls the inside door handle through the pull rope or strap to unlock the door. In this way, the door can be pushed open normally, making the testing environment closer to the real-world usage scenario. This also allows for the simultaneous durability testing of the inside door handle.
[0008] Preferably, the connecting rod is fitted onto the end of the locating pin via a groove, and a countersunk hole is provided at the contact position between the connecting rod and the locating pin. A bolt threadedly connected to the locating pin is inserted into the countersunk hole. The locating pin passes through an insertion hole on the mounting plate, and a locating post is fixedly connected to the upper surface of the connecting rod. A spring facing the connecting rod is fixedly connected to the mounting plate, with the free end of the spring pressing against the connecting rod, and the locating post and the inner helical surface of the spring in contact. The bolt fixes the connecting rod and the locating pin through the countersunk hole, ensuring synchronous movement of the two. The spring applies pressure to the connecting rod, causing the locating post to make tight contact with the inner helical surface of the spring, thereby restricting the position of the locating pin. When the connecting rod moves, the elastic force of the spring, together with the locating post, achieves the elastic reset of the connecting rod, ensuring stable operation of the lifting assembly and facilitating the disassembly and assembly of each component.
[0009] Preferably, the comprehensive testing fixture for automobile door limiters also includes:
[0010] The torque acquisition module, installed on the motor output shaft, monitors the torque required to drive the door in real time, determining whether the limit switch is stuck, worn, or experiencing force attenuation, and generates a torque stability coefficient via the control module. The abnormal noise acquisition module, installed near the limit switch on the door, monitors the high-frequency stress wave signal generated by the limit switch during movement, effectively identifying abnormal noises caused by wear, dry friction, or structural fatigue, and generates an abnormal noise risk coefficient via the control module. The force acquisition module, installed at the connection between the door and the moving rod, monitors the tension and pressure in the direction of movement in real time, cross-validates the torque value, and generates a force attenuation rate via the control module. The control module then converts the torque stability coefficient into a torque stability coefficient. The abnormal noise risk coefficient and force attenuation rate are compared with their corresponding thresholds, and the door limiter detection process is automatically controlled based on the comparison results. At the same time, the limiter performance is evaluated based on the analysis results. The torque acquisition module acquires the torque data of the motor output shaft in real time, reflecting the change in resistance to drive the door. The abnormal noise acquisition module captures the high-frequency signal when the limiter moves and identifies abnormal noises. The force acquisition module monitors the force change at the connection between the moving rod and the door, and verifies it with the torque data. Based on these data, the control module generates the torque stability coefficient, abnormal noise risk coefficient and force attenuation rate, respectively, to achieve automated control of the door limiter detection process. At the same time, the limiter performance is evaluated based on the analysis results.
[0011] Preferably, the output and input terminals of the torque acquisition module, the output and input terminals of the abnormal noise acquisition module, and the output and input terminals of the force acquisition module are electrically connected to the input and output terminals of the control module, respectively, and the output terminal of the control module is electrically connected to the input terminal of the motor.
[0012] Preferably, the control module collects the following adjustment strategies for each parameter:
[0013] The torque acquisition module collects the torque value required to drive the door; the abnormal noise acquisition module collects the high-frequency stress wave signal generated by the limiter during movement; the force acquisition module collects the tension and pressure in the direction of actuation; the control module calculates the torque stability coefficient Cτ, the abnormal noise risk coefficient Rae, and the force attenuation rate Df; if Cτ or Rae exceeds the threshold for multiple consecutive cycles, the control module can trigger an alarm, stop the machine, and record the current cycle count and data, indicating a possible fault; if Df exceeds the set tolerance (e.g., 15%), it is determined that the holding force has failed, and the test is terminated; the test continues until the target number of cycles is reached, or the limiter malfunctions.
[0014] Preferably, the logic for generating the torque stability coefficient is as follows:
[0015] Based on the actual torque collected by the torque acquisition module at each moment during the T time period of the detection process, the deviation between the actual torque and the average torque is calculated, and a torque stability coefficient reflecting the stability of torque fluctuation is generated.
[0016] Preferably, the logic for generating the abnormal noise risk coefficient is as follows:
[0017] Based on the signal amplitude exceeding the threshold collected by the abnormal noise acquisition module within a single motion cycle, the average value is calculated to generate an abnormal noise risk coefficient that reflects the degree of abnormal noise risk.
[0018] Preferably, the logic for generating the force attenuation rate is as follows:
[0019] Based on the deviation between the peak force recorded after each set number of test cycles and the initial peak force, the force attenuation rate, which reflects the degree of attenuation of the holding force, is calculated.
[0020] Compared with the prior art, the present invention provides a comprehensive testing fixture for automotive door limiters, which has the following advantages:
[0021] 1. A comprehensive testing fixture for automotive door limiters uses a fixed rod to drive a movable rod, which in turn pushes and pulls the door to simulate the door opening and closing process and test the limiter's performance. This testing fixture can also perform durability testing on the door at the same time.
[0022] 2. Comprehensive testing fixture for car door limiters: The telescopic mechanism allows for length adjustment, enabling precise adjustment of the movable rod to a position close to the height of the inner armrest of the car door. This further enhances the fixture's adaptability to different door sizes and expands the testing range.
[0023] 3. Comprehensive testing fixture for car door limiters: The lifting component can simulate the unlocking process of a car door in actual use. The door is unlocked by pulling the inner door handle, making the testing environment closer to the real-world usage scenario and improving the accuracy of the test results. At the same time, it can also perform durability testing on the inner door handle, increasing the testing functionality.
[0024] 4. Comprehensive testing fixture for automotive door limiters: The testing system, equipped with torque acquisition module, abnormal noise acquisition module, and force acquisition module, can monitor torque value, high-frequency stress wave signal, and tension and pressure in real time. Through multi-parameter comprehensive analysis, it can comprehensively evaluate the performance of the limiter, including problems such as jamming, wear, force attenuation, and abnormal noise. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the first angle structure of the comprehensive testing fixture for automobile door limiters proposed in this invention.
[0026] Figure 2 This is a schematic diagram of the telescopic structure of the comprehensive testing fixture for automobile door limiters proposed in this invention.
[0027] Figure 3This is a schematic diagram of the lifting assembly structure of the comprehensive testing fixture for automotive door limiters proposed in this invention.
[0028] Figure 4 This is a schematic diagram of the front structure of the mounting plate of the comprehensive testing fixture for automobile door limiters proposed in this invention.
[0029] Figure 5 This is a schematic diagram of the back structure of the mounting plate of the comprehensive testing fixture for automobile door limiters proposed in this invention.
[0030] Figure 6 For the present invention Figure 4 A magnified structural diagram at point A.
[0031] In the diagram: 1. Motor base; 2. Motor; 3. Expansion joint; 301. Sleeve; 302. Inner column; 303. Guide column; 304. Screw; 4. Fixed rod; 5. Movable rod; 6. Reserved hole; 7. Mounting plate; 8. Drive shaft; 9. Fixed plate; 10. Pull ring; 11. Bevel gear one; 12. Bevel gear two; 13. Ratchet; 14. Connecting rod; 15. Spring; 16. Locating pin; 17. Locating column; 18. Cover; 19. Slide groove; 20. Countersunk hole; 21. Bolt; 22. Insertion hole. Detailed Implementation
[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0034] Reference Figures 1-6 A comprehensive testing fixture for car door limiters includes a motor base 1, a motor 2, a telescopic device 3, a fixed rod 4, and a movable rod 5. The motor 2 is installed inside the motor base 1. One end of the telescopic device 3 is fixedly connected to the output shaft of the motor 2, and the other end is fixedly connected to the fixed rod 4. The movable rod 5 is rotatably connected to the free end of the fixed rod 4 and is used to push and pull the car door. The free end of the movable rod 5 is provided with a reserved hole 6.
[0035] In use, the movable rod 5 is connected to the car door by wrapping the strap around the reserved hole 6 and the inner armrest of the car door (or a clamp matching the inner armrest of the car door can be set at the end of the movable rod 5 to connect it to the car door). Then, the motor 2 starts to drive the output shaft to rotate, which drives the telescopic device 3 to move in and out of the car. In turn, the fixed rod 4 drives the movable rod 5 to move. The movable rod 5 realizes the push and pull operation of the car door, simulating the opening and closing process of the car door to test the performance of the limiter. This testing fixture can also perform durability testing on the car door at the same time.
[0036] In this invention, the telescopic device 3 includes a sleeve 301, an inner column 302, a guide column 303, and a screw 304. The sleeve 301 is sleeved on the top of the inner column 302. The guide column 303 is fixedly connected to the side of the inner column 302 and slidably connected to the sleeve 301. The screw 304 is rotatably connected to the side of the inner column 302 and threadedly connected to the sleeve 301.
[0037] In use, rotating the screw 304 causes the sleeve 301 to move axially along the inner post 302 under the threaded engagement of the screw 304 and the sleeve 301. The guide post 303 slides with the sleeve 301 to ensure that the sleeve 301 moves smoothly without deviation, thereby realizing the length adjustment of the telescopic device 3 to adjust the movable rod 5 to a position close to the height of the inner armrest of the car door.
[0038] Furthermore, the present invention also includes a lifting assembly, which includes a mounting plate 7, a drive shaft 8, a fixing plate 9, a pull ring 10, a first bevel gear 11, a second bevel gear 12, a ratchet 13, a connecting rod 14, a positioning pin 16, and a cover 18. The mounting plate 7 is fixedly connected to the top of the motor base 1, the drive shaft 8 is rotatably connected to the mounting plate 7, the first bevel gear 11 is fixedly installed at the end of the drive shaft 8, the second bevel gear 12 is fixedly installed on the output shaft of the motor 2 and meshes with the first bevel gear 11, the ratchet 13 is fixedly installed on the drive shaft 8, the connecting rod 14 is sleeved on one end of the positioning pin 16, the fixing plate 9 is fixedly installed on the other end of the positioning pin 16, the pull ring 10 is fixedly connected to the free end of the fixing plate 9, the end of the connecting rod 14 abuts against the edge of the ratchet 13, and the connecting rod 14 and the mounting plate 7 form an elastic connection, and the cover 18 is fixedly connected to the top of the mounting plate 7 and covers the ratchet 13.
[0039] In use, first tie the two ends of the pull rope or strap to the pull ring 10 and the inside door handle respectively. The output shaft of the motor 2 rotates, driving the second bevel gear 12 to rotate. Through the meshing transmission of the first bevel gear 11 and the second bevel gear 12, the transmission shaft 8 and the ratchet 13 are driven to rotate. When the ratchet 13 rotates, it pushes the connecting rod 14 to rotate. The connecting rod 14 drives the positioning pin 16, the fixing plate 9 and the pull ring 10 to move. Then the pull ring 10 pulls the inside door handle through the pull rope or strap to unlock the door. In this way, the door can be pushed open normally, making the testing environment closer to the real use scenario. This also allows for the simultaneous durability testing of the inside door handle.
[0040] In this invention, the connecting rod 14 is sleeved on the end of the positioning pin 16 through the sliding groove 19, and a countersunk hole 20 is provided at the contact position between the connecting rod 14 and the positioning pin 16. A bolt 21 threadedly connected to the positioning pin 16 is inserted into the countersunk hole 20. The positioning pin 16 passes through the insertion hole 22 on the mounting plate 7, and a positioning post 17 is fixedly connected to the upper surface of the connecting rod 14. A spring 15 facing the connecting rod 14 is fixedly connected to the mounting plate 7. The free end of the spring 15 presses on the connecting rod 14, and the inner spiral surface of the positioning post 17 and the spring 15 are in contact.
[0041] In use, bolt 21 fixes connecting rod 14 and positioning pin 16 through countersunk hole 20 to ensure synchronous movement of the two. Spring 15 applies pressure to connecting rod 14, so that positioning pin 17 is in close contact with the inner helical surface of spring 15, thereby restricting the position of positioning pin 16. When connecting rod 14 moves, the elastic force of spring 15 cooperates with positioning pin 17 to realize the elastic reset of connecting rod 14, ensuring stable operation of lifting assembly and making disassembly and assembly of each component convenient.
[0042] In another embodiment of the present invention, the comprehensive testing fixture for automobile door limiters further includes a testing system composed of the following components:
[0043] The torque acquisition module is installed on the output shaft of motor 2. It is used to monitor the torque value required to drive the door in real time, to determine whether the limit switch is stuck, worn or has reduced force, and to generate a torque stability coefficient through the control module.
[0044] The abnormal noise acquisition module is installed near the limiter on the door. It is used to monitor the high-frequency stress wave signal generated by the limiter during its movement in real time, effectively identify abnormal noise caused by wear, dry friction or structural fatigue, and generate an abnormal noise risk coefficient through the control module.
[0045] The force acquisition module is installed at the connection between the door and the movable rod 5. It is used to monitor the tension and pressure in the direction of actuation in real time, cross-verify with the torque value, and generate the force attenuation rate through the control module.
[0046] The control module compares the torque stability coefficient, abnormal noise risk coefficient, and force attenuation rate with the corresponding thresholds, and realizes automated control of the door limiter detection process based on the comparison results. At the same time, it evaluates the limiter performance based on the analysis results.
[0047] It should be noted that the torque acquisition module can be a torque sensor or other device capable of monitoring the torque value required to drive the door in real time; the abnormal noise acquisition module can be an acoustic emission sensor or other device capable of monitoring the high-frequency stress wave signal generated by the limit switch during its movement in real time; the force acquisition module can be a miniature tensile and compressive sensor or other device capable of monitoring the tensile and compressive forces in the direction of actuation in real time; and the control module is an embedded controller (such as the STM32 series), which is responsible for controlling the operation of motor 2, acquiring sensor data, and performing real-time analysis. Therefore, the torque acquisition module, abnormal noise acquisition module, force acquisition module, and control module are not specifically limited here and can be selected according to actual needs.
[0048] During use, the torque acquisition module acquires the torque data of the output shaft of motor 2 in real time, reflecting the change in resistance to drive the door; the abnormal noise acquisition module captures the high-frequency signal when the limiter moves and identifies abnormal noises; the force acquisition module monitors the force value change at the connection between the movable rod 5 and the door, and verifies it with the torque data. Based on these data, the control module generates the torque stability coefficient, abnormal noise risk coefficient and force attenuation rate, respectively, to realize the automated control of the door limiter detection process, and evaluates the limiter performance based on the analysis results.
[0049] In this invention, the output and input terminals of the torque acquisition module, the output and input terminals of the abnormal noise acquisition module, and the output and input terminals of the force acquisition module are electrically connected to the input and output terminals of the control module, respectively, and the output terminal of the control module is electrically connected to the input terminal of the motor 2.
[0050] In another embodiment of the present invention, the control module collects the following adjustment strategies for each parameter:
[0051] Real-time detection: The torque acquisition module collects the torque value required to drive the door; the abnormal noise acquisition module collects the high-frequency stress wave signal generated by the limiter during movement; the force acquisition module collects the tension and pressure in the direction of actuation;
[0052] Coefficient calculation:
[0053] Torque stability coefficient Cτ: The generation logic of the torque stability coefficient is as follows:
[0054] S1. The actual torque at different times within time T during the detection process is obtained through the torque acquisition module. The actual torque obtained at time n within time T is calibrated as τn, where n = 1, 2, 3, ..., k, and n is a positive integer.
[0055] S2. Calculate the torque stability coefficient. The expression for the calculation is:
[0056]
[0057] In the formula, is the average torque over time T; k is the number of samples over time T.
[0058] Abnormal Noise Risk Coefficient Rae: The logic for generating the abnormal noise risk coefficient is as follows:
[0059] S1. Obtain the amplitude of the transmitted signal exceeding the threshold within a single motion cycle during the detection process through the abnormal noise acquisition module, and label the amplitude of the transmitted signal exceeding the threshold acquired in the i-th time as Aaei, i=1, 2, 3, ..., N, where i is a positive integer;
[0060] S2. Calculate the abnormal noise risk coefficient. The formula for calculation is:
[0061]
[0062] In the formula, N represents the number of times the threshold is exceeded.
[0063] Force attenuation rate Df: The logic for generating the force attenuation rate is as follows:
[0064] S1. After each set number of test cycles (e.g., 5000 times), run a standard opening action once and record the peak torque or force value, and compare it with the initial peak force.
[0065] S2. Calculate the force attenuation rate. The expression for the calculation is:
[0066]
[0067] In the formula, This refers to the peak torque or force value. This represents the initial peak force.
[0068] Real-time control:
[0069] If Cτ or Rae exceeds the threshold for multiple consecutive cycles, the control module can trigger an alarm, stop the machine, and record the current number of cycles and data, indicating a possible fault. If Df exceeds the set tolerance (e.g., 15%), it is determined that the holding force has failed, and the test is terminated. The test continues until the target number of cycles is reached, or the limit switch malfunctions (e.g., unable to maintain the angle, excessive noise, or sudden increase in torque causing jamming).
[0070] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A comprehensive testing fixture for automobile door limiters, comprising a motor mount (1), a motor (2), a telescopic device (3), a fixed rod (4), and a movable rod (5), characterized in that, The motor (2) is installed inside the motor base (1). One end of the telescopic device (3) is fixedly connected to the output shaft of the motor (2), and the other end is fixedly connected to the fixed rod (4). The movable rod (5) is rotatably connected to the free end of the fixed rod (4) for pushing and pulling the car door. The free end of the movable rod (5) is provided with a reserved hole (6).
2. The comprehensive testing fixture for automobile door limiters according to claim 1, characterized in that, The telescopic device (3) includes a sleeve (301), an inner column (302), a guide column (303), and a screw (304). The sleeve (301) is fitted onto the top of the inner column (302). The guide column (303) is fixedly connected to the side of the inner column (302) and is slidably connected to the sleeve (301). The screw (304) is rotatably connected to the side of the inner column (302) and is threadedly connected to the sleeve (301).
3. The comprehensive testing fixture for automobile door limiters according to claim 1, characterized in that, It also includes a lifting assembly, which includes a mounting plate (7), a drive shaft (8), a fixing plate (9), a pull ring (10), a first bevel gear (11), a second bevel gear (12), a ratchet (13), a connecting rod (14), a positioning pin (16), and a cover (18). The mounting plate (7) is fixedly connected to the top of the motor base (1), the drive shaft (8) is rotatably connected to the mounting plate (7), the first bevel gear (11) is fixedly installed at the end of the drive shaft (8), and the second bevel gear (12) is fixedly installed on the output shaft of the motor (2). The ratchet (13) is fixedly mounted on the drive shaft (8) and meshes with the bevel gear (11). The connecting rod (14) is sleeved on one end of the positioning pin (16). The fixing plate (9) is fixedly mounted on the other end of the positioning pin (16). The pull ring (10) is fixedly connected to the free end of the fixing plate (9). The end of the connecting rod (14) abuts against the edge of the ratchet (13), and the connecting rod (14) and the mounting plate (7) form an elastic connection. The cover (18) is fixedly connected to the top of the mounting plate (7) and covers the ratchet (13).
4. The comprehensive testing fixture for automobile door limiters according to claim 3, characterized in that, The connecting rod (14) is sleeved on the end of the positioning pin (16) through the sliding groove (19), and a countersunk hole (20) is provided at the contact position between the connecting rod (14) and the positioning pin (16). A bolt (21) threadedly connected to the positioning pin (16) is inserted into the countersunk hole (20). The positioning pin (16) passes through the insertion hole (22) on the mounting plate (7), and a positioning post (17) is fixedly connected to the upper surface of the connecting rod (14). A spring (15) facing the connecting rod (14) is fixedly connected to the mounting plate (7). The free end of the spring (15) presses on the connecting rod (14), and the inner spiral surface of the positioning post (17) and the spring (15) are in contact.
5. The comprehensive testing fixture for automobile door limiters according to claim 1, characterized in that, Also includes: The torque acquisition module is used to monitor the torque value required to drive the door in real time and generate a torque stability coefficient through the control module. The abnormal noise acquisition module is used to monitor the high-frequency stress wave signal generated by the limiter during its movement in real time, and to generate an abnormal noise risk coefficient through the control module; The force acquisition module is used to monitor the tension and pressure in the direction of actuation in real time, and generates the force attenuation rate through the control module; The control module compares the torque stability coefficient, abnormal noise risk coefficient, and force attenuation rate with their corresponding thresholds, and automatically controls the door limiter detection process based on the comparison results. At the same time, it evaluates the limiter performance based on the analysis results.
6. The comprehensive testing fixture for automobile door limiters according to claim 5, characterized in that, The output and input terminals of the torque acquisition module, the output and input terminals of the abnormal noise acquisition module, and the output and input terminals of the force acquisition module are electrically connected to the input and output terminals of the control module, respectively. The output terminal of the control module is electrically connected to the input terminal of the motor (2).
7. The comprehensive testing fixture for automobile door limiters according to claim 5, characterized in that, The control module collects the following adjustment strategies for each parameter: The torque acquisition module collects the torque value required to drive the door; the abnormal noise acquisition module collects the high-frequency stress wave signal generated by the limit switch during movement; the force acquisition module collects the tension and pressure in the direction of actuation; the control module calculates the torque stability coefficient Cτ, the abnormal noise risk coefficient Rae, and the force attenuation rate Df; if Cτ or Rae exceeds the threshold for multiple consecutive cycles, the control module can trigger an alarm, stop the machine, and record the current cycle count and data, indicating a possible fault; if Df exceeds the set tolerance, it is determined that the holding force has failed, and the test is terminated; the test continues until the target number of cycles is reached, or the limit switch malfunctions.
8. The comprehensive testing fixture for automobile door limiters according to claim 5, characterized in that, The logic for generating the torque stability coefficient is as follows: Based on the actual torque collected by the torque acquisition module at each moment during the T time period of the detection process, the deviation between the actual torque and the average torque is calculated, and a torque stability coefficient reflecting the stability of torque fluctuation is generated.
9. The comprehensive testing fixture for automobile door limiters according to claim 5, characterized in that, The logic for generating the abnormal noise risk coefficient is as follows: Based on the signal amplitude exceeding the threshold collected by the abnormal noise acquisition module within a single motion cycle, the average value is calculated to generate an abnormal noise risk coefficient that reflects the degree of abnormal noise risk.
10. The comprehensive testing fixture for automobile door limiters according to claim 5, characterized in that, The logic for generating the force attenuation rate is as follows: Based on the deviation between the peak force recorded after each set number of test cycles and the initial peak force, the force attenuation rate, which reflects the degree of attenuation of the holding force, is calculated.