A method and apparatus for detecting an inertia load of an automobile door lock

Abstract

The present application belongs to the field of automobile equipment detection, and particularly relates to a kind of automobile door lock inertia load detection method and equipment, method includes the following steps: step one, the door lock to be measured is fixedly installed on a horizontal turntable in full lock state according to actual working condition, the distance between the door lock to be measured and the center of the horizontal turntable is R;Step two, start the horizontal turntable, gradually increase the speed of the horizontal turntable, so that the horizontal turntable reaches the centripetal acceleration specified in the test standard, and keep for a specified time length;Step three, observe whether the door lock to be measured has been opened;Step four, adjust the different test directions of the door lock to be measured, repeat steps one to three, and obtain the results whether the door lock has been opened in each test direction.The equipment includes a horizontal turntable with adjustable and measurable speed and a mounting bracket, and the distance between the mounting bracket and the center of the horizontal turntable is R.The present application has the technical advantages of lower cost, easy operation and reliable detection results.

Description

Technical Field

[0001] This invention belongs to the field of automotive equipment testing, specifically relating to a method and equipment for detecting the inertial load of automotive door locks. Background Technology

[0002] National standards have established relevant regulations for automotive door locks. Standard GB15086-2013, "Performance Requirements and Test Methods for Automotive Door Locks and Door Retaining Components," stipulates that for all door lock components or subsystems, the minimum inertial load that can be applied to the door lock in a specific direction during a collision, preventing unlocking, must be calculated or tested. This includes the minimum inertial load resistance required to prevent unlocking, ensuring that the door lock system (correctly installed on the door) remains locked when subjected to a 30g inertial load in the test direction. This ensures the door will not open by itself during a collision. Current testing methods involve installing the door lock on the entire vehicle (or body-in-white), running the vehicle (or securing it securely to a test device), and conducting an acceleration collision test over a distance to check if the door lock system's inertial load resistance meets the standard requirements. This method requires sophisticated testing equipment, a large testing area, is complex to operate, and is expensive. It also requires testing the entire vehicle and all corresponding door locks together, preventing automotive door lock manufacturers from conducting self-certification tests beforehand, thus compromising design quality. Summary of the Invention

[0003] The purpose of this invention is to provide a low-cost, easy-to-operate, and reliable method for detecting the inertial load of automotive door locks, thereby overcoming the shortcomings of the prior art.

[0004] The technical solutions for achieving the above objectives include the following:

[0005] A method for detecting the inertial load of a car door lock includes the following steps: Step 1: Fix the door lock to be tested on the horizontal turntable in the fully locked state under actual working conditions, with the direction of the vehicle's test inertial acceleration in the same direction as the centripetal acceleration of the turntable. The distance between the door lock to be tested and the center of the horizontal turntable is R. Step 2: Start the horizontal turntable and gradually increase its rotation speed until it reaches the centripetal acceleration specified in the test standard, and maintain that centripetal acceleration for the specified duration. Step 3: Observe whether the door lock under test has opened automatically; Step 4: Adjust the different test directions of the door lock under test, and repeat steps 1 to 3 to obtain the results of whether the door lock has opened by itself in each test direction.

[0006] Furthermore, in step two, the specified centripetal acceleration is 3-60g, and the duration of the specified centripetal acceleration is no more than 200ms.

[0007] Furthermore, in step three, if the door lock to be tested opens by itself, it is determined that the inertial load of the door lock in the test direction is unqualified; otherwise, it is qualified.

[0008] Furthermore, the different test directions include positive lateral, negative lateral, positive longitudinal, negative longitudinal, positive vertical, and negative vertical.

[0009] Furthermore, the door lock under test includes a lock body, a door handle, a connector between the door handle and the lock body, a sealing strip, a locking / unlocking device, and a latch. Components of the door lock under test that do not affect the opening of the lock body due to inertia generated in that direction may be excluded from the test, such as the door lock's controller circuit.

[0010] Furthermore, the connecting component is a cable or rod. During testing, the cable or rod is shortened, and the inertial load in the test direction is calculated using inertial testing procedures for the shortened portion. A corresponding counterweight is then used to replace and fix the shortened portion at the connection between the cable or rod and the lock body. Reducing the size of the connecting component helps to reduce the volume of the horizontal turntable and simplify the testing equipment. The inertial testing procedures can refer to GB15086-2013 "Performance Requirements and Test Methods for Automobile Door Locks and Door Retaining Components".

[0011] The aforementioned method for detecting the inertial load of automotive door locks involves rotating a fully locked door lock fixed on a horizontal turntable. The centripetal force acting on the lock simulates the impact force on the vehicle body in that direction. The lock is held at the acceleration specified in the test standard for the duration specified, and the method checks whether it opens automatically. If it opens automatically, the inertial load in that direction is deemed unqualified; otherwise, it is considered qualified. This method, by adjusting the fixed orientation of the door lock, simulates the impact force on the vehicle body in various directions by applying centripetal forces in each direction, thus enabling the detection of the inertial load in each direction. It has the advantages of simple operation and reliable results. In this method, the acceleration of the door lock can be calculated from the speed of the horizontal turntable or detected by installing an acceleration sensor on the door lock.

[0012] According to the above detection method, the present invention provides an inertial load detection device for automotive door locks, including a horizontal turntable with adjustable and measurable speed, and a mounting bracket for fixing the door lock to be tested is provided on the horizontal turntable, the mounting bracket being R away from the center of the horizontal turntable.

[0013] Furthermore, the mounting bracket includes a horizontal base plate and a lock body fixing plate, a handle fixing plate, a locking / unlocking device fixing plate, a first vertical plate, and a second vertical plate mounted on the horizontal base plate. The lock body fixing plate also has a latch mounting bracket. The first and second vertical plates are parallel to each other and respectively located on both sides of the lock body fixing plate. During testing, the lock body, latch, handle, and locking / unlocking device fixed on the mounting bracket are aligned with their relative positions within the actual vehicle body. During testing, the bracket is adjusted according to the test direction so that the direction of inertial acceleration coincides with the direction of centripetal acceleration.

[0014] Furthermore, the mounting bracket is equipped with an acceleration sensor, which can directly obtain the acceleration of the door lock under test, and can also perform mutual verification with the angular velocity of the speed adjustment to ensure data accuracy.

[0015] Furthermore, with the axis of the horizontal turntable as the center, two or more symmetrical mounting brackets are symmetrically arranged on the horizontal turntable. This arrangement can detect multiple door locks at the same time, improving work efficiency, and can also balance the horizontal turntable, improving the rotational stability of the horizontal turntable.

[0016] When testing the car lock inertial load test equipment, the car lock is first adjusted to the fully locked state and fixedly installed on the mounting bracket in the manner of being installed on the car door. By adjusting the radial installation angle of the mounting bracket relative to the horizontal turntable and the vertical and horizontal installation state of the car lock, a specified centrifugal acceleration (such as 30g) is applied to the car lock and held for a specified duration. The test is then conducted by observing whether the car lock opens on its own to verify whether the inertial load of the car lock in different collision directions is qualified.

[0017] The automotive lock inertial load testing device of the present invention uses centripetal acceleration to simulate the impact force on the car lock under test in a fully locked state. Compared with the existing method of installing the car lock on the car body and then impacting the car body in all directions, the automotive lock inertial load testing device of the present invention only needs to adjust the installation state of the car lock relative to the radial direction to simulate the impact state of the car door lock. This testing device has no site requirements and has the advantages of simple structure, low operating cost and high testing efficiency. It can conduct self-certification tests for design quality in advance and provide a reliable guarantee for design quality.

[0018] When testing car door locks using the aforementioned automotive lock inertial load testing equipment, in order to reduce the volume of the horizontal turntable, components that are inconvenient to install, such as pull rods or cables, can be shortened. According to the inertial resistance calculation method in Appendix A of GB15086 standard, the inertial resistance of the shortened part in the testing direction is calculated, and corresponding counterweights are applied to the corresponding position of the lock body opening handle to keep the force state of the lock body during testing consistent with the state when installed on a real vehicle body.

[0019] Furthermore, as understood by those skilled in the art, the automotive lock inertial load testing device of the present invention obviously also requires a horizontal turntable drive mechanism and a horizontal turntable speed control mechanism. During the test, a timing device is also required, and a detection device for the self-opening of the door lock under test can also be installed. The relevant control circuits and mechanisms can be implemented using existing technologies, and will not be described again in this case. Attached Figure Description

[0020] Figure 1 This is a top view of the automotive door lock inertial load detection device used in this embodiment for longitudinal inertial load detection. Figure 2 This is a top view of the automotive door lock inertial load detection device used in this embodiment when performing lateral inertial load detection. Figure 3 This is a front view schematic diagram of the automotive door lock inertial load detection device used in this embodiment when performing vertical inertial load detection; Figure 4 This is a schematic diagram showing the connection state between the door lock under test and the mounting bracket. Figure 5 A schematic diagram of the mounting bracket for the door lock under test, as shown in the embodiment; Figure 6 for Figure 1 The enlarged schematic diagram of section A shows the local state of the inertial load when the positive longitudinal angle of the door lock under test is detected; Figure 7 for Figure 2 The enlarged schematic diagram of section C shows the local state of the inertial load when the positive lateral angle of the door lock under test is detected; Figure 8 for Figure 2 Enlarged schematic diagram of section D, showing the local state of inertial load when detecting the negative lateral angle of the door lock under test; Figure 9 for Figure 1 Enlarged schematic diagram of section B; showing the local state of the inertial load when detecting the negative longitudinal angle of the door lock under test; Figure 10 A partial schematic diagram of the mounting bracket combined with the horizontal turntable when detecting the inertial load in the positive vertical direction of the door lock under test; Figure 11 A partial schematic diagram of the mounting bracket combined with the horizontal turntable when testing the inertial load of the door lock under test in the negative vertical direction.

[0021] In the diagram: 1. Horizontal turntable; 2. Mounting bracket; 2-1. Horizontal base plate; 2-2. Lock body fixing plate; 2-3. Locking buckle mounting bracket; 2-3-1. Elastic telescopic rod; 2-4. Handle fixing plate; 2-5. Locking / unlocking device fixing plate; 2-6. First vertical plate; 2-7. Second vertical plate; 3. Door lock to be tested; 3-1. Lock body; 3-2. Pull cable; 3-3. Locking buckle; 3-4. Door handle; 3-5. Locking / unlocking device; 3-6. Counterweight. Detailed Implementation

[0022] The present invention will be specifically described below with reference to the embodiments.

[0023] See Figures 1 to 11 An inertial load testing device for automotive door locks includes a horizontal turntable 1, a rotation drive mechanism mounted below the turntable 1, and the central axis of the turntable 1 connected to the rotation drive mechanism. Two mounting brackets 2 for fixing the door locks to be tested are symmetrically arranged at both ends of the same diameter on the horizontal turntable 1, simulating the installation position and size of the components of a real car door lock. The mounting brackets 2 consist of a horizontal base plate 2-1 and a lock body fixing plate 2-2, a handle fixing plate 2-4, a locking / unlocking device fixing plate 2-5, a first vertical plate 2-5, and a second vertical plate 2-6 mounted on the horizontal base plate 2-1. The panel of the horizontal base plate 2-1 has 4 Four bolt through holes are distributed at the four corners of a square. The lock body fixing plate 2-2 also has a latch mounting bracket 2-3. The latch mounting bracket 2-3 includes an elastic telescopic rod 2-3-1 installed on the back of the lock body fixing plate 2-2. The elastic telescopic rod 2-3-1 is parallel to the lock body fixing plate 2-2 and has latch mounting holes. Correspondingly, the lock body fixing plate 2-2 has notches for the latch 3-3 to move. The function of the elastic telescopic rod 2-3-1 is to simulate… The force exerted by the sealing strip on the lock body is not required to actually install the sealing strip for the experiment. The lock body fixing plate 2-2 is equipped with an acceleration sensor for measuring acceleration. The first and second vertical plates are parallel to each other and are respectively set on both sides of the lock body fixing plate 2-2. The first and second vertical plates are provided with four bolt through holes in the same position as the horizontal base plate 2-1. The door lock 3 under test consists of a lock body 3-1, a latch 3-3, a shortened pull cable 3-2, a door handle 3-4, a locking / unlocking device 3-5, and a counterweight 3-6.

[0024] When performing inertial load testing on the door lock under test, first fix the door lock to the mounting bracket, see [reference]. Figure 4 and Figure 5Installation steps: Install the latch 3-3 inside the lock body 3-1, with the lock body in the fully locked state. Insert the latch 3-3 through the pre-drilled notch in the lock body fixing plate 2-2 and install it onto the elastic telescopic rod 2-3-1 on the back. Place the mounting surface of the lock body 3-1 against the surface of the lock body fixing plate 2-2, and then secure it to the lock body fixing plate 2-2 with bolts. Install the locking / unlocking device 3-5 and the door handle 3-4 onto their respective fixing plates. Connect one end of the shortened cable 3-2 to the door handle 3-4, the middle to the locking / unlocking device 3-5, and the other end to the lock body 3-1. Fix the counterweight 3-6 into the connection hole between the cable 3-2 and the lock body 3-1. At this point, the door lock under test is fixed on the mounting bracket 2. Fix the mounting bracket 2 onto the horizontal turntable 1, and the inertial load test can begin.

[0025] The mass of the counterweight 3-6 in this embodiment is calculated according to the performance requirements and test methods of automobile door locks and door retaining components in GB15086-2013. The inertial load in each direction of the shortened part of the cable 3-2 is calculated in that direction. When the test is carried out in that direction, the counterweight 3-6 of the corresponding mass is fixed at the connection between the cable 3-2 and the lock body 3-1.

[0026] When it is necessary to test the lateral and longitudinal inertial loads of the door lock to be tested, the horizontal base plate 2-1 of the mounting bracket 2 needs to be fixed on the horizontal turntable, see [reference]. Figure 1 and Figure 2 The rotation drive mechanism is started. According to GB15086-2013 "Performance Requirements and Test Methods for Automotive Door Locks and Door Retaining Components", the horizontal turntable 1 rotates and gradually accelerates. The door lock under test makes circular motion under the action of centripetal force. When the centripetal acceleration of the door lock under test reaches 30g, the acceleration is maintained for 30ms. If the door lock under test 3 opens by itself, it can be judged that the inertial load of the door lock in this direction is unqualified.

[0027] When testing the longitudinal inertial load of the door lock 3 under test, rotating the horizontal turntable 1 simulates the centripetal force acting on the door lock by mimicking the lateral impact force on the vehicle body. (See [link]). Figure 6 After completing the longitudinal inertial load test, loosen the bolts at the four corners of the horizontal base plate 2-1, rotate the mounting bracket 90° to the left or right, then insert the bolts into the bolt holes and tighten them. This will fix the horizontal base plate 2-1 onto the horizontal turntable 1. At this point, the door lock under test will rotate 90° to the left or right in the horizontal plane. (See [reference]). Figure 7 and Figure 8 Rotate the horizontal turntable 1. The centripetal force acting on the door lock under test can simulate the impact force on the left and right sides of the vehicle body. At this time, the positive or negative lateral inertial load of the door lock under test 3 can be tested. When it is necessary to test the negative longitudinal inertial load of the door lock under test 3, after the positive longitudinal inertial load test, rotate the mounting bracket itself 180° and then fix the horizontal base plate 2-1 with bolts. See Figure 9 At this time, by rotating the horizontal turntable 1, the centripetal force on the door lock under test can simulate the impact force on the rear of the vehicle body, and the negative longitudinal inertial load of the door lock under test 3 can be detected.

[0028] To test the inertial load of the rear door lock (which opens vertically) in both directions, the mounting bracket 2 needs to be fixed to the horizontal turntable via the first vertical plate 2-6 or the second vertical plate 2-7. (See [reference]). Figure 3 Simulate the forces applied to the door lock 3 under test in two directions during a vehicle rollover collision: from the top to the bottom of the door and from the bottom to the top of the door. When detecting the vertical inertial load on the door lock 3 under test, the second vertical plate 2-7 is bolted to the horizontal turntable. (See [reference]). Figure 10 When testing the positive longitudinal inertial load, the door lock 3 under test is rotated 90° in the vertical plane. When the horizontal turntable 1 rotates, the centripetal force on the door lock 3 under test can simulate the force applied from the top to the bottom of the door during a vehicle rollover collision, thus obtaining the positive vertical inertial load of the door lock 3 under test. When testing the negative vertical inertial load of the door lock 3 under test, the first vertical plate 2-6 is fixed to the horizontal turntable 1 with bolts, see [reference]. Figure 11 ,relatively Figure 10 The mounting bracket 2 is rotated 180° in the vertical plane, so that the door lock 3 under test is rotated 180° in the vertical plane. When the horizontal turntable 1 is rotated, the centripetal force on the door lock 3 under test can simulate the force applied from the top to the bottom of the door when the vehicle body rolls over and collides, thereby detecting and obtaining the negative vertical inertial load of the door lock 3 under test.

[0029] It should be noted that, since another mounting bracket is symmetrically provided on the other side of the horizontal turntable in this embodiment, two sets of door locks can be tested simultaneously. The inertial load of the two sets of door locks can be tested in the same direction, or the inertial load of the two sets of door locks can be tested in different directions.

[0030] The automotive door lock inertial load testing equipment of this embodiment applies a centripetal force to the door lock 3 under test in a fully locked state on a horizontal turntable. By adjusting the engagement state of the mounting bracket and the horizontal turntable, the relative angle between the door lock 3 under test and the centripetal force can be adjusted. This allows for the testing of the inertial load of the door lock 3 under test in the six test directions specified in Appendix C of "GB15086-2013 Performance Requirements and Test Methods for Automotive Door Locks and Door Retaining Components". This testing equipment has a small footprint, high testing efficiency, is easy to operate, and provides reliable test results. The equipment has a simple structure and low manufacturing and operating costs, which is conducive to achieving full coverage testing of products and provides a guarantee for the production of high-quality products.

Claims

1. A method for detecting the inertial load of a car door lock, characterized in that, The detection method is implemented using an automotive door lock inertial load detection device. The detection device includes a horizontal turntable with adjustable and measurable speed. A mounting bracket for fixing the door lock to be tested is provided on the horizontal turntable, and the distance between the mounting bracket and the center of the horizontal turntable is R. The method includes the following steps: Step 1: Fix the door lock to be tested on the horizontal turntable in the fully locked state according to the actual working conditions, with the direction of the vehicle's test inertial acceleration in the same direction as the centripetal acceleration of the turntable. Step 2: Start the horizontal turntable and gradually increase its rotation speed until it reaches the centripetal acceleration specified in the test standard, and maintain that centripetal acceleration for the specified duration. Step 3: Observe whether the door lock under test has opened automatically; Step 4: Adjust the different test directions of the door lock under test, and repeat steps 1 to 3 to obtain the results of whether the door lock has opened by itself in each test direction.

2. The method for detecting the inertial load of a car door lock according to claim 1, characterized in that, In step two, the specified centripetal acceleration is 3-60g, and the duration of the specified centripetal acceleration is no more than 200ms.

3. The method for detecting the inertial load of a car door lock according to claim 1, characterized in that, In step three, if the door lock to be tested opens by itself, it is determined that the inertial load of the door lock in the test direction is unqualified; otherwise, it is qualified.

4. The method for detecting the inertial load of a car door lock according to claim 1, characterized in that, The different test directions include positive lateral, negative lateral, positive longitudinal, negative longitudinal, positive vertical, and negative vertical.

5. The method for detecting the inertial load of a car door lock according to claim 1, characterized in that, The door lock under test includes a lock body, a door handle, a connector between the door handle and the lock body, a sealing strip, a locking / unlocking device, and a latch.

6. The method for detecting the inertial load of a car door lock according to claim 5, characterized in that, The connecting component is a cable or a rod. During testing, the cable or rod is shortened. The shortened part is calculated using inertial test procedures to determine the inertial load in the test direction. The shortened part is then replaced with a corresponding counterweight and fixed at the connection between the cable or rod and the lock body.

7. The method for detecting the inertial load of a car door lock according to claim 1, characterized in that, The mounting bracket includes a horizontal base plate and a lock body fixing plate, a handle fixing plate, a locking / unlocking device fixing plate, a first vertical plate, and a second vertical plate mounted on the horizontal base plate. The lock body fixing plate is also provided with a buckle mounting bracket. The first and second vertical plates are parallel to each other and are respectively set on both sides of the lock body fixing plate. During testing, the lock body, buckle, handle, locking / unlocking device fixed on the mounting bracket are aligned with the relative positions in the actual vehicle body.

8. The method for detecting the inertial load of a car door lock according to claim 1, characterized in that, An acceleration sensor is installed on the mounting bracket.

9. The method for detecting the inertial load of a car door lock according to claim 1, characterized in that, With the axis of the horizontal turntable as the center, two or more symmetrical mounting brackets are symmetrically arranged on the horizontal turntable.

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