A sliding door closing force simulation device and minimum closing force testing method

Abstract

The present application relates to a sliding door closing force simulation device and a minimum closing force testing method, wherein a screw rod is provided with a nut and a coil spring; two ends of the coil spring are respectively connected to the nut and the push plate; the screw rod is arranged on a mounting base; a variable frequency speed regulating motor is connected to the screw rod transmission; a control device controls the rotation speed of the variable frequency speed regulating motor according to the detection information of a displacement sensing component; when detecting the minimum closing force, a coil spring with a corresponding rigidity coefficient is designed with a standard curve obtained from test data as a target; the real-time compression amount of the coil spring is detected by the displacement sensing component, the real-time force value of the coil spring is calculated, and the difference between the real-time force value at each moment and the standard force at the corresponding moment of the standard curve is obtained; the rotation speed of the variable frequency speed regulating motor is adjusted according to the difference, so that the thrust output by the push plate matches the closing force of the customer's actual closing condition, thereby solving the problem that after the closing force is set in the early stage, the closing process cannot be adjusted in real time, which is inconsistent with the actual closing condition of the customer.

Description

Technical Field

[0001] The present application relates to the technical field of automobile performance testing, and in particular to a sliding door closing force simulation device and a minimum closing force testing method. Background Art

[0002] At present, users in the market often complain about the large closing force of the vehicle sliding door, which indirectly reflects that the accuracy and efficiency of the control of this performance indicator by the OEM needs to be improved. From the manufacturing end, the internal clearance of the compression of parts such as the sliding door sealing strip fluctuates due to the manufacturing accuracy, which can easily lead to problems such as large sliding door sealing reaction force and large sliding door closing force. Therefore, it is necessary to test the minimum closing force of the sliding door.

[0003] In the Chinese application CN115326416A, the minimum door closing force test device outputs the door closing force through a spiral tension spring. One end of the tension spring is connected to the inner side of the door, and the other end is fixed to the car body. A dynamometer is connected in the middle to measure and record the force value of each door closing. The elongation of the spring is used to store elastic potential energy. The tension spring force value is reduced from large to small until the door can just be closed, and the minimum door closing force can be measured.

[0004] Among them, the closing force is stimulated by a coil spring. After the spring is released, its force value cannot be adjusted at any time. The force value of the spring is linear and single, and the actual user's closing force curve is nonlinear, resulting in a large difference between the closing force-displacement curve applied by this method and the user's actual manual closing force curve, which in turn leads to a deviation between the measured closing force and the customer's closing force perception.

[0005] In the Chinese application CN111380696A, the closing speed simulation device and method can adjust the closing force output according to the weight of different types of car doors, so that the closing speed of each car door remains constant, ensuring the accuracy of detection and improving the calibration accuracy and efficiency of the minimum closing speed of the car door; this technology only measures the closing speed and only uses the minimum closing speed to calibrate the difficulty of closing the door. It does not measure the closing force or include the closing force in the evaluation criteria, which may cause a difference in the customer's closing experience.

[0006] After the closing force of the above evaluation devices and methods is set in the early stage, the closing process cannot be adjusted in real time, which is inconsistent with the actual closing situation of the customer. In addition, the evaluation is either based on the closing speed or the closing force. The two evaluation methods have their own advantages and disadvantages, resulting in inaccurate and objective evaluation. Summary of the invention

[0007] The embodiments of the present application provide a sliding door closing force simulation device and a minimum closing force testing method to solve the problem in the related art that after the closing force is set in the early stage, the closing process cannot be adjusted in real time, which is inconsistent with the actual closing situation of the customer, resulting in subsequent evaluation being inaccurate and objective.

[0008] In a first aspect, a sliding door closing force simulation device is provided, comprising:

[0009] A screw rod is provided with a nut movable in the length direction thereof, and a helical spring is coaxially sleeved thereon; one end of the helical spring is detachably connected to the nut, and the other end is detachably connected to a push plate, and the push plate is provided with a through hole for the screw rod to pass through;

[0010] An installation base, the top of which is movably connected to the two ends of the screw rod at both ends in the length direction; a variable frequency speed regulating motor connected to the screw rod and a displacement sensor component for detecting the compression amount of the coil spring are installed on the installation base;

[0011] The control device is connected with the variable frequency speed regulating motor and the displacement sensing component and is used to control the rotation speed of the variable frequency speed regulating motor according to the detection information of the displacement sensing component so as to adjust the output force value of the spiral spring in real time.

[0012] In some embodiments, a lifting frame that can be lifted and lowered vertically is connected to the bottom of the mounting base.

[0013] In some embodiments, the displacement sensing assembly includes a signal transmitting part and a signal receiving part, the signal receiving part is located on a side surface of the push plate close to the nut, and the signal transmitting part is installed on the nut.

[0014] In a second aspect, a method for testing the minimum closing force of a sliding door is provided, which comprises the following steps:

[0015] Performing a door closing test on the sliding door of the target vehicle to obtain test data; processing the test data to obtain a plurality of standard curves regarding closing force and closing speed;

[0016] Making a coil spring with a corresponding stiffness coefficient according to the standard curve;

[0017] The coil springs with different stiffness coefficients are loaded into the sliding door closing force simulation device as described in any one of claims 1 and tested in batches; in each test, the corresponding standard curve is selected according to the loaded coil spring to simulate the closing force;

[0018] It is determined whether the closing switch of the sliding door is completely closed, and the minimum closing force and the minimum closing speed of the sliding door of the target vehicle are obtained according to the set rules.

[0019] In some embodiments, determining whether the closing switch of the sliding door is completely closed and obtaining the minimum closing and minimum closing speed of the sliding door of the target vehicle according to a set rule specifically includes the following steps:

[0020] If the closing switch is not completely closed, select the standard curve with the larger peak value from small to large, and re-test the simulated closing force until the closing switch is completely closed for the first time; then use the standard curve corresponding to the first complete closure as the target standard curve, and obtain the minimum closing force and minimum closing speed based on the target standard curve;

[0021] If the closing switch is completely closed, select the standard curve with the smallest peak value from large to small, and re-test the simulated closing force until the closing switch is not completely closed; then use the standard curve selected before the closing switch is not completely closed for the first time as the target standard curve, and derive the minimum closing force and minimum closing speed based on the target standard curve.

[0022] In some embodiments, the closing force is simulated according to a standard curve corresponding to the installed coil spring to perform multiple tests;

[0023] If the closing switch of the sliding door is fully closed each time, the final result is that the sliding door is fully closed;

[0024] If the ratio of the number of times the closing switch of the sliding door is not completely closed to the total number of times is greater than or equal to ., the final result is that the sliding door is not completely closed;

[0025] If the ratio of the number of times the closing switch of the sliding door is completely closed to the total number of times is greater than or equal to ., the final result is that the sliding door is completely closed.

[0026] In some embodiments, a door closing test is performed on a sliding door of a target vehicle to obtain test data, specifically comprising the following steps:

[0027] A pedal force sensor for detecting the real-time door closing force at the handle is fixed on the outer handle of the sliding door, and a speed measuring instrument is placed on the vehicle; the speed measuring instrument is used to detect the instantaneous speed when the sliding door is closed;

[0028] The target vehicle is placed on a level surface, all door glass is raised, the sliding door is opened to the maximum position, and the cycle in the passenger compartment is started; then the experimenter closes the door with different forces outside the vehicle, and records the detection information of the pedal force sensor, speed measuring instrument, and force application time after each door closing;

[0029] According to the detection information of the pedal force sensor and the speed measuring instrument, as well as the force application time, the actual sawtooth curve of the closing force of each door closing and the instantaneous speed of the sliding door when closing are obtained to obtain the test data.

[0030] In some embodiments, the test data is processed to obtain a plurality of standard curves for closing force and closing speed, comprising the following steps:

[0031] The STEP function is used to fit the measured sawtooth curve of the closing force to obtain a closing force fitting curve with a gradient;

[0032] Correlating the closing force fitting curve with a gradient corresponding to each door closing with the instantaneous speed of the sliding door when closing, so as to obtain a standard curve of closing force and closing speed;

[0033] Repeat the above steps to obtain the standard curve of multiple door closing operations.

[0034] In some embodiments, manufacturing a coil spring with a corresponding stiffness coefficient according to the standard curve comprises the following steps:

[0035] The center diameters, spring free lengths and designed compression heights of multiple coil springs are designed as fixed values; the material, wire diameter and effective number of coils of the coil springs are designed as variable parameters;

[0036] According to the standard curve, a helical spring with a corresponding stiffness coefficient is manufactured to obtain a peak force in the corresponding standard curve;

[0037] The stiffness coefficient is calculated based on the peak force, the free length of the spring and the designed compression height; then the material, wire diameter and effective number of coils of the coil spring are designed based on the stiffness coefficient, the center diameter and the calculation formula 1 to obtain the manufacturing parameters of the coil spring corresponding to the standard curve;

[0038] The production is performed according to the production parameters.

[0039] In some embodiments, the closing force is simulated according to a standard curve corresponding to the installed coil spring in each test, which includes the following steps:

[0040] Obtaining the pre-compression height and the designed compression height of the installed coil spring, as well as the force application time, and then calculating the initial speed of the variable frequency speed regulating motor;

[0041] The variable frequency speed regulating motor is operated at the initial speed, and during the operation, the compression amount of the coil spring is detected in real time by the displacement sensing component; the real-time force value of the coil spring is calculated according to the detected compression amount, and then the difference between the real-time force value at each moment and the standard force at the corresponding moment of the standard curve is calculated;

[0042] The speed of the variable frequency speed regulating motor is adjusted according to the difference, so that the thrust change curve generated by the push plate on the sliding door is consistent with the standard curve.

[0043] The beneficial effects of the technical solution provided by this application include:

[0044] The embodiment of the present application provides a sliding door closing force simulation device and a minimum closing force testing method, wherein a screw rod is provided with a nut which moves in the length direction thereof, and a coaxial sleeve thereof is provided with a coil spring; one end of the coil spring is detachably connected to the nut, and the other end is detachably connected to a push plate, and the push plate is provided with a through hole for the screw rod to pass through; the top of the mounting base is movably connected to the two ends of the screw rod at both ends in the length direction respectively; a variable frequency speed regulation motor connected to the screw rod transmission and a displacement sensing component for detecting the compression amount of the coil spring are installed on the mounting base; a control device is connected to the variable frequency speed regulation motor and the displacement sensing component to control the rotation speed of the variable frequency speed regulation motor, thereby controlling the compression amount of the coil spring, and further controlling the closing force generated by the coil spring.

[0045] The above structure allows for the design of a coil spring with a corresponding stiffness coefficient based on the standard curve obtained from the measured test data when detecting the minimum closing force, to ensure that the compression characteristics are generally consistent with the standard curve. In the process of the device pushing the sliding door to close, the real-time compression of the coil spring is detected by the displacement sensor component to calculate the real-time force value of the coil spring, and then the difference between the real-time force value at each moment and the standard force at the corresponding moment of the standard curve is calculated; the speed of the variable frequency speed regulating motor is adjusted according to the difference, and the output force value is fine-tuned in real time to make the thrust change curve generated by the push plate on the sliding door consistent with the standard curve, ultimately ensuring that the thrust output by the test device is consistent with the closing force of the customer's actual closing condition, thereby solving the problem that after the closing force is set in the early stage, the closing process cannot be adjusted in real time, which is inconsistent with the customer's actual closing situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0047] Figure 1 An exploded schematic diagram of a sliding door closing force simulation device provided in an embodiment of the present application;

[0048] Figure 2 The measured sawtooth curve of the door closing force and the fitting curve of the door closing force provided in the embodiment of the present application;

[0049] Figure 3 A plurality of standard curves about closing force and closing speed provided for the embodiments of the present application;

[0050] Figure 4 A schematic diagram of a sliding door closing force simulation device provided in an embodiment of the present application being installed on a sliding door;

[0051] Figure 5 A working logic diagram provided for an embodiment of the present application.

[0052] In the figure: 1. lifting frame; 2. mounting base; 3. screw gear; 4. displacement sensor assembly; 5. screw; 6. nut; 7. coil spring; 8. push plate; 9. variable frequency speed regulating motor; 10. screw head bracket; 11. screw tail bracket; 12. nut bracket; 13. reversing gear; 14. bushing; 15. motor fixing seat. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0054] The embodiments of the present application provide a sliding door closing force simulation device and a minimum closing force testing method to solve the problem in the related art that after the closing force is set in the early stage, the closing process cannot be adjusted in real time, which is inconsistent with the actual closing situation of the customer, resulting in subsequent evaluation being inaccurate and objective.

[0055] See also Figure 1 A sliding door closing force simulation device includes a lifting frame 1, a mounting base 2, a screw rod 5, a nut 6, a coil spring 7, a push plate 8, and a variable frequency speed regulating motor 9.

[0056] Among them, a mounting base 2 is provided on the top of the lifting frame 1, and a slide groove is provided on the mounting base 2; a screw rod 5 parallel to the slide groove is also installed on the mounting base 2; the two ends of the screw rod 5 are connected to the mounting base 2 through a screw rod head bracket 10 and a screw rod tail bracket 11 respectively;

[0057] A nut 6 is connected to the screw rod 5; a plurality of coil springs 7 are selectively detachably connected to the nut 6 and are coaxially sleeved on the screw rod 5; the rigidity coefficients of the plurality of coil springs 7 are different; a push plate 8 is detachably connected to one end of the coil spring 7 away from the nut 6; the push plate 8 is provided with a through hole for the screw rod 5 to pass through, and its bottom is slidably connected to the slide groove; the nut 6 is slidably connected to the top of the mounting base 2 through a nut bracket 12, so that the axial movement of the nut 6 can be guaranteed.

[0058] The variable frequency speed regulating motor 9 is mounted on the mounting base 2 and is connected to the screw 5 in transmission; that is, a screw gear 3 is provided at one end of the screw 5; the screw gear 3 is connected to the output end of the variable frequency speed regulating motor 9 in transmission through the reversing gear 13, the screw gear 3 and the shaft sleeve 14, wherein the reversing gear 13 has the function of making the screw 5 rotate in the opposite direction. The reversing structure is relatively common and will not be explained in detail. The variable frequency speed regulating motor 9 is connected to the mounting base 2 through the motor fixing seat 15. The displacement sensing assembly 4 is used to detect the compression amount of the coil spring 7, that is, the detection information, so as to adjust the output force value of the coil spring 7 in real time; the control device is connected to the variable frequency speed regulating motor 9 and the displacement sensing assembly 4 and is used to control the rotation speed of the variable frequency speed regulating motor 9 according to the detection information of the displacement sensing assembly 4.

[0059] Through the above settings, the control device is connected to the variable frequency speed regulating motor 9 and the displacement sensor assembly 4 to control the rotation speed of the variable frequency speed regulating motor 9, thereby controlling the compression amount of the coil spring 7, and then controlling the closing force generated by the coil spring 7, so that it can be adjusted in real time during the closing process.

[0060] The specific manifestations are:

[0061] The above structure allows for the design of a coil spring with a corresponding stiffness coefficient based on the standard curve obtained from the measured test data when detecting the minimum closing force, to ensure that the compression characteristics are generally consistent with the standard curve. In the process of the device pushing the sliding door to close, the real-time compression of the coil spring 7 is detected by the displacement sensor assembly 4 to calculate the real-time force value of the coil spring 7, and then the difference between the real-time force value at each moment and the standard force at the corresponding moment of the standard curve is calculated; the speed of the variable frequency speed regulating motor 9 is adjusted according to the difference, and the output force value is fine-tuned in real time to make the thrust change curve generated by the push plate on the sliding door consistent with the standard curve, ultimately ensuring that the thrust output by the test device is consistent with the closing force of the customer's actual closing condition, thereby solving the problem that after the closing force is set in the early stage, the closing process cannot be adjusted in real time, which is inconsistent with the actual closing situation of the customer.

[0062] In some preferred embodiments, in order to ensure that the above sliding door closing force simulation device can adapt to different door handle heights, a lifting frame 1 that can be lifted vertically is connected to the bottom of the mounting base 2; when simulating the closing force, the lifting frame 1 is used to make the push plate 8 and the sliding door outer wrench at the same height and close to the rear of the sliding door.

[0063] In some preferred embodiments, the displacement sensing assembly 4 includes a signal transmitting part and a signal receiving part, the signal receiving part is located on a side surface of the push plate 8 close to the nut 6, and the signal transmitting part is installed on the nut 6. In this way, the distance between the signal receiving part and the signal transmitting part can change with the compression amount of the coil spring 7, and specifically can be a laser displacement sensor.

[0064] The present application also proposes a method for testing the minimum closing force of a sliding door using the above-mentioned sliding door closing force simulation device, which comprises the following steps:

[0065] Step S01: performing a door closing test on a sliding door of a target vehicle to obtain test data; processing the test data to obtain a plurality of standard curves regarding closing force and closing speed;

[0066] Step S02, manufacturing a coil spring 7 with a corresponding stiffness coefficient according to a standard curve;

[0067] Step S03, loading the coil springs 7 with different rigidity coefficients into the sliding door closing force simulation device for testing in batches; in each test, selecting the corresponding standard curve according to the loaded coil spring 7 to simulate the closing force;

[0068] Step S04: determine whether the closing switch of the sliding door is completely closed, and obtain the minimum closing force and minimum closing speed of the sliding door of the target vehicle according to the set rules.

[0069] The following is a detailed description of each step

[0070] In step S01, a door closing test is performed on the sliding door of the target vehicle to obtain test data, which specifically includes the following steps:

[0071] Step S010, fixing a pedal force sensor for detecting the real-time door closing force at the handle on the outer handle of the sliding door, and placing a speed measuring instrument on the vehicle; the speed measuring instrument is used to detect the instantaneous speed when the sliding door is closed;

[0072] Step S011, place the target vehicle on a level surface, raise all door glass, open the sliding door to the maximum position, and start the cycle in the passenger compartment; then the experimenter closes the door with different forces outside the vehicle, and records the detection information of the pedal force sensor and speed measuring instrument, as well as the force application time after each door closing; the sliding door of the target vehicle is tested for closing, and a large number of customers' real closing force curves and subjective feelings about the difficulty of closing the door are collected, and a sliding door closing difficulty evaluation standard is established to make the evaluation objective and more in line with the real feelings of customers. As shown in the attached manual Figure 4 shown.

[0073] That is, the whole vehicle is placed on the horizontal ground, all door glasses are raised, the sliding door is opened to the maximum position, and the circulation in the passenger compartment is started. A pedal force sensor is fixed on the outer handle of the sliding door. The sensor can record the real-time closing force of the operator acting on the handle. At the same time, a speed measuring instrument is placed at a position 200mm away from the fully closed sliding door to record the instantaneous speed of the sliding door closing at this point as the closing speed. At the beginning of the experiment, the force and speed experimental data acquisition device is started, and the person closes the door at different speeds outside the vehicle. After each closing, the operator makes a subjective evaluation of the closing force (divided into three levels: large, medium and small), and corresponds it to the closing curve and speed of that time. The data is statistically sorted, and samples with large deviations are eliminated to form the following sliding door closing test data record table.

[0074]

[0075] Step S012: derive the actual measured sawtooth curve of the door closing force and the instantaneous speed of the sliding door when closing each time according to the detection information of the pedal force sensor and the speed measuring instrument, as well as the force application time, so as to obtain the test data. Figure 2 as shown.

[0076] Step S013, processing the test data to obtain a plurality of standard curves about closing force and closing speed, including the following steps:

[0077] The measured sawtooth curve of the door closing force is fitted using the STEP function to obtain a door closing force fitting curve with a gradient; the door closing force fitting curve with a gradient corresponding to each door closing is associated with the instantaneous speed of the sliding door when closing, so as to obtain a standard curve of the closing force and the closing speed; the above steps are repeated to obtain standard curves for multiple door closing operations; for example, as shown in the attached manual Figure 3 shown.

[0078] Compared with traditional technology, this curve chart and evaluation method have the following advantages:

[0079] The door force measured sawtooth curve is a batch of samples of actual door closing force curves collected from customers to match the actual door closing conditions, and combined with the instantaneous speed to obtain a standard curve; in steps S02 and S03 of the present application, these curves are input into the test device computer, and the spiral spring 7 with the corresponding rigidity coefficient is designed and installed in the sliding door closing force simulation device, and finally the sliding door closing force simulation device outputs a closing force that matches the actual door closing conditions of the customer. In addition, the method can be tested on different vehicles, and the test evaluation is performed based on the test data to ensure accuracy.

[0080] The evaluation standard of closing force is based on the real evaluation of customers. After statistical sorting to eliminate errors, the evaluation result, i.e. the standard curve, is closer to the real feelings of customers. This evaluation method is mainly based on the evaluation of closing force, supplemented by the evaluation of closing speed. The two indicators of evaluation support each other, ensuring the accuracy and objectivity of the evaluation.

[0081] In step S02, the coil spring 7 with the corresponding stiffness coefficient is manufactured according to the standard curve, which specifically includes the following steps:

[0082] The center diameter, spring free length and designed compression height of the plurality of coil springs 7 are designed as fixed values; the material, wire diameter and effective number of coils of the coil springs 7 are designed as variable parameters;

[0083] A coil spring 7 with a corresponding stiffness coefficient is manufactured according to the standard curve to obtain the peak force in the corresponding standard curve; the stiffness coefficient is calculated based on the peak force, the free length of the spring and the designed compression height; then the material, wire diameter and effective number of coils of the coil spring 7 are designed based on the stiffness coefficient, the center diameter and calculation formula 1 to obtain the manufacturing parameters of the coil spring 7 corresponding to the standard curve; and the coil spring 7 is manufactured according to the manufacturing parameters.

[0084] Specifically, each closing force fitting curve has a different slope k', force application time t' and peak force Fmax. The helical spring compression force formula (i.e., compression curve function) is:

[0085] F=k*λ

[0086] F is the spring compression force [N], k is the spring stiffness coefficient [N / mm], and λ is the compression stroke [mm]. Among them, k is the spring's own characteristic index, and its calculation formula is:

[0087]

[0088] G is the shear modulus of elasticity of the spring material [MPa] (G value: carbon steel 80000, stainless steel 72000), d is the wire diameter [mm], n is the effective number of turns, and D is the center diameter [mm].

[0089] Combined with the above formula, the design of the coil spring can be carried out. In order to ensure that different series of coil springs can adapt to this test device, the spring D is uniformly designed to be 30mm, the spring free length H0 is designed to be 1000mm (a larger design can increase the adjustment stroke and thus improve the output force accuracy), the pre-compression height H1 is designed to be 0.99H0 (the initial height of the spring placed in the test device), and the design compression height H2 is designed to be 0.7H0 (the compression amount is 0.3H0, exceeding this value, the spring is easy to deform, and the compression amount is too small to affect the adjustment stroke and thus affect the output force accuracy). The calculation formula of the spring stiffness coefficient is:

[0090]

[0091] Fmax, i.e. the peak force, can be obtained from the above test data table, so that the spring stiffness coefficient k corresponding to each curve can be calculated, and then according to the above spring k calculation formula, the detailed structural parameters of the spring can be designed. Figure 3 A corresponding coil spring can be designed for each standard curve of closing force.

[0092] In step S03, the closing force is simulated according to the standard curve corresponding to the installed coil spring 7 in each test, which includes the following steps:

[0093] Obtain the pre-compression height and the designed compression height of the installed coil spring 7, as well as the force application time, and then calculate the initial speed of the variable frequency speed regulating motor 9;

[0094] The variable frequency speed regulating motor 9 is operated at the initial speed, and the compression amount of the coil spring 7 is detected in real time by the displacement sensing component 4 during the operation; the real-time force value of the coil spring 7 is calculated according to the detected compression amount, and then the difference between the real-time force value at each moment and the standard force at the corresponding moment of the standard curve is calculated;

[0095] The rotation speed of the variable frequency speed regulating motor 9 is adjusted according to the difference, so that the thrust variation curve generated by the push plate 8 on the sliding door is consistent with the standard curve.

[0096] Specifically: At the beginning of the test, the vehicle to be tested is parked on a horizontal ground, all door glasses are raised, and the circulation in the passenger compartment is started. A speed measuring instrument is placed 200mm away from the fully closed position of the sliding door, and the instantaneous speed of the sliding door closing through this position is recorded. The sliding door is opened to the maximum position (fully unlocked), and the test device is placed at the rear of the sliding door. The standard curve is input into the computer, and the coil spring 7 (progressive selection of size) corresponding to the standard curve is installed into the screw rod 5, and the height of the lifting frame 1 is adjusted so that the Z-direction height of the push plate 8 is the same as that of the sliding door outer handle, and the X-direction is close to the rear of the sliding door.

[0097] The variable frequency speed regulating motor 9 is powered on, driving the screw rod 5 to rotate, and the screw rod 5 meshes with the nut 6, pushing the nut 6 to move axially, thereby compressing the coil spring 7, generating thrust, and pushing the sliding door to close through the push plate 8.

[0098]

[0099] In this way, the initial speed of the variable frequency speed regulating motor 9 can be determined (the motor speed and the nut running speed are determined by the tooling mechanical structure and are fixed values). After the computer obtains this input, it takes the selected standard curve as the target and accurately controls the motor speed by controlling the input current of the variable frequency speed regulating motor. During the process, the computer also obtains the displacement signal (i.e. the compression amount of the coil spring 7), identifies the real-time force value of the coil spring 7, calculates the difference with the standard curve, and then continuously adjusts the current and speed of the variable frequency speed regulating motor 9, and then fine-tunes and corrects the force of the coil spring 7 to ensure that the output force value is infinitely close to the actual closing force value at any time.

[0100] In step S04, it is determined whether the closing switch of the sliding door is completely closed, and the minimum closing and minimum closing speed of the sliding door of the target vehicle are obtained according to the set rules, which specifically includes the following steps:

[0101] If the closing switch is not completely closed, select the standard curve with the larger peak value from small to large, and re-test the simulated closing force until the closing switch is completely closed for the first time; then use the standard curve corresponding to the first complete closure as the target standard curve, and obtain the minimum closing force and minimum closing speed based on the target standard curve;

[0102] If the closing switch is completely closed, select the standard curve with the smallest peak value from large to small, and re-test the simulated closing force until the closing switch is not completely closed; then use the standard curve selected before the closing switch is not completely closed for the first time as the target standard curve, and derive the minimum closing force and minimum closing speed based on the target standard curve. That is to say, if the force value and coil spring 7 selected each time cannot close the sliding door, re-select the standard curve with a larger force value and coil spring 7; if the sliding door can be closed, select the standard curve with a smaller force value and coil spring 7. The above explains Figure 5 How to choose between a curve with greater closing force and a curve with less closing force.

[0103] Furthermore, each test can be repeated three times to reduce the error.

[0104] The closing force is simulated according to the standard curve corresponding to the installed spiral spring 7 to perform multiple tests;

[0105] If the closing switch of the sliding door is fully closed each time, the final result is that the sliding door is fully closed;

[0106] If the ratio of the number of times the closing switch of the sliding door is not completely closed to the total number of times is greater than or equal to 0.5, the final result is that the sliding door is not completely closed;

[0107] If the ratio of the number of times the closing switch of the sliding door is completely closed to the total number of times is greater than or equal to 0.5, the final result is that the sliding door is completely closed. Finally, the minimum closing force and closing speed of the sliding door of the vehicle are found through the exhaustive approximation method.

[0108] Although the present application is described using a sliding door as an embodiment, its method and principle are also applicable to traditional revolving doors. That is to say, when testing the closing force of the door, as long as the standard curve is applied and inputted in reverse to the force-generating tooling, or the force value of the device can be adjusted in real time according to the standard curve, it falls within the scope of the present application.

[0109] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0110] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0111] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for testing the minimum closing force of a sliding door, characterized in that: It includes the following steps: Performing a door closing test on the sliding door of the target vehicle to obtain test data; processing the test data to obtain a plurality of standard curves regarding closing force and closing speed; A door closing test is performed on the sliding door of the target vehicle to obtain test data, specifically including the following steps: a pedal force sensor for detecting the real-time door closing force at the handle is fixed on the outer handle of the sliding door, and a speed measuring instrument is placed on the vehicle; the speed measuring instrument is used to detect the instantaneous speed when the sliding door is closed; the target vehicle is placed on a horizontal ground, all door glasses are raised, the sliding door is opened to the maximum position, and the circulation in the passenger compartment is started; then the experimenter closes the door with different forces outside the vehicle, and records the detection information of the pedal force sensor, the speed measuring instrument, and the force application time after each door closing; according to the detection information of the pedal force sensor and the speed measuring instrument, and the force application time, the actual measured sawtooth curve of the door closing force and the instantaneous speed of the sliding door when closing each time the door is closed are obtained to obtain the test data; The test data are processed to obtain a plurality of standard curves about closing force and closing speed, including the following steps: fitting the measured sawtooth curve of the closing force using the STEP function to obtain a closing force fitting curve with a gradient; correlating the closing force fitting curve with a gradient corresponding to each door closing operation with the instantaneous speed when the sliding door is closed to obtain a standard curve about closing force and closing speed; repeating the above steps to obtain standard curves for multiple door closing operations; Manufacturing a coil spring (7) with a corresponding stiffness coefficient according to the standard curve; The coil springs (7) with different stiffness coefficients are loaded into the sliding door closing force simulation device for testing in batches; in each test, a corresponding standard curve is selected according to the loaded coil spring (7) to simulate the closing force; Determine whether the closing switch of the sliding door is completely closed, and obtain the minimum closing force and minimum closing speed of the sliding door of the target vehicle according to the set rules; The sliding door closing force simulation device comprises: a screw rod (5) on which a nut (6) is provided which moves in the length direction thereof, and a coil spring (7) is coaxially sleeved thereon; one end of the coil spring (7) is detachably connected to the nut, and the other end is detachably connected to a push plate (8), and the push plate (8) is provided with a through hole for the screw rod (5) to pass through; a mounting base (2), the top ends of which are movably connected to the two ends of the screw rod (5) in the length direction respectively; a variable frequency speed regulating motor (9) connected to the screw rod (5) in transmission, and a displacement sensing component (4) for detecting the compression amount of the coil spring (7) are mounted on the mounting base (2); and a control device is connected to the variable frequency speed regulating motor (9) and the displacement sensing component (4), and is used to control the rotation speed of the variable frequency speed regulating motor (9) according to the detection information of the displacement sensing component (4), so as to adjust the output force value of the coil spring (7) in real time.

2. The method for testing the minimum closing force of a sliding door according to claim 1, characterized in that: Determining whether the closing switch of the sliding door is completely closed, and obtaining the minimum closing and minimum closing speed of the sliding door of the target vehicle according to the set rules, specifically includes the following steps: If the closing switch is not completely closed, select the standard curve with the larger peak value from small to large, and re-test the simulated closing force until the closing switch is completely closed for the first time; then use the standard curve corresponding to the first complete closure as the target standard curve, and obtain the minimum closing force and minimum closing speed based on the target standard curve; If the closing switch is completely closed, select the standard curve with the smallest peak value from large to small, and re-test the simulated closing force until the closing switch is not completely closed; then use the standard curve selected before the closing switch is not completely closed for the first time as the target standard curve, and derive the minimum closing force and minimum closing speed based on the target standard curve.

3. The method for testing the minimum closing force of a sliding door according to claim 2, wherein: Simulating the closing force according to the standard curve corresponding to the installed spiral spring (7) to perform multiple tests; If the closing switch of the sliding door is fully closed each time, the final result is that the sliding door is fully closed; If the ratio of the number of times the closing switch of the sliding door is not completely closed to the total number of times is greater than or equal to 0.5, the final result is that the sliding door is not completely closed; If the ratio of the number of times the closing switch of the sliding door is completely closed to the total number of times is greater than or equal to 0.5, the final result is that the sliding door is completely closed.

4. The method for testing the minimum closing force of a sliding door according to claim 1, characterized in that: The method of manufacturing a coil spring (7) having a corresponding stiffness coefficient according to the standard curve comprises the following steps: The center diameter, spring free length and designed compression height of the plurality of coil springs (7) are designed as fixed values; the material, wire diameter and effective number of coils of the coil springs (7) are designed as variable parameters; According to the standard curve, a coil spring (7) with a corresponding stiffness coefficient is manufactured to obtain a peak force in the corresponding standard curve; The stiffness coefficient is calculated based on the peak force, the free length of the spring and the designed compression height; then the material, wire diameter and effective number of coils of the coil spring (7) are designed based on the stiffness coefficient, the center diameter and calculation formula 1, so as to obtain the manufacturing parameters of the coil spring (7) corresponding to the standard curve; The production is performed according to the production parameters.

5. The method for testing the minimum closing force of a sliding door according to claim 4, characterized in that: In each test, the closing force is simulated according to the standard curve corresponding to the installed spiral spring (7), which includes the following steps: Obtaining the pre-compression height and the designed compression height of the inserted coil spring (7), as well as the force application time, and then calculating the initial speed of the variable frequency speed regulating motor (9); The variable frequency speed regulating motor (9) is operated at the initial speed, and during the operation, the compression amount of the coil spring (7) is detected in real time by means of the displacement sensing component (4); the real-time force value of the coil spring (7) is calculated based on the detected compression amount, and then the difference between the real-time force value at each moment and the standard force at the corresponding moment of the standard curve is calculated; The rotation speed of the variable frequency speed regulating motor (9) is adjusted according to the difference, so that a thrust change curve generated by the push plate (8) on the sliding door matches a standard curve.

6. The method for testing the minimum closing force of a sliding door according to claim 1, wherein: The bottom of the installation base (2) is connected to a lifting frame (1) that can be lifted and lowered in the vertical direction.

7. The method for testing the minimum closing force of a sliding door according to claim 1, wherein: The displacement sensor assembly (4) comprises a signal transmitting part and a signal receiving part, the signal receiving part is located on a side surface of the push plate (8) close to the nut (6), and the signal transmitting part is mounted on the nut (6).

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