Analysis method and system for vehicle door opening and closing design

Abstract

The invention provides an analysis method and system for vehicle door opening and closing design. The method comprises the steps that a preset door opening and closing force of a standard vehicle is tested to serve as a target door opening and closing force; target door closing energy is determined; carrying out multi-body dynamics modeling by using the vehicle door assembling assembly and the vehicle door key point coordinates, and calculating the vehicle door gravity stored energy without a limiting stopper; under the action of gravity, door opening torque of a limiter is added on the basis of the multi-body dynamic model, and door opening force is calculated; after the vehicle door assembling assembly statically rotates to the maximum opening degree state, the door closing torque of the limiting stopper is added, and the door closing force is calculated; door closing energy is calculated through the door closing force; and the door opening and closing force is compared with the target door opening and closing force, and the door closing energy is compared with the target door closing energy until the door opening and closing force and the door closing energy meet the design requirements. Based on the method, the invention further provides an analysis system for the vehicle door opening and closing design. The door closing smoothness and continuity of the real vehicle can be accurately designed, and the door opening and closing operation quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle switch door quality analysis, and in particular relates to an analysis method and system for vehicle switch door design. Background Art

[0002] The door opening and closing force of a car refers to the force required when the user stands outside the car to open and close the door. The corresponding usage scenario is daily door opening and getting in or door closing and locking operations. The force application point is usually the outer handle or the area from the handle to the door edge. For door opening, the sealing strip will pop out the door at the moment of door opening and unlocking. Therefore, the door opening force is the user's operating force during the entire stroke from the door breaking away from the contact with the sealing strip to the maximum opening of the door. The force is perpendicular to the plane where the force application point and the hinge axis are located, and the direction is from the inner panel of the door to the outer panel. For door closing, the operating habits of most users are to slam the door or push the door instantly, so that the door closes automatically after having a certain initial speed. Based on user operating habits, on the one hand: the door closing force does not need to be evaluated for the entire stroke like the door opening force, but only the door closing stall force, that is, the door design hovering position, needs to be evaluated; on the other hand, the door's self-closing performance needs to be evaluated. Whether the door can close automatically depends on whether the door closing energy is greater than the resistance work and energy dissipation. The design of the door closing energy should ensure good self-closing performance of the door while avoiding excessive energy. The door opening and closing force refers to the subjective door opening and closing feeling brought to the user by the objective values ​​of the full-stroke door opening force and the door closing force. For passenger cars, the door opening and closing force usually increases with the increase of the vehicle size, and the force feeling becomes heavier accordingly, giving customers a subjective feeling of calmness, solidity and grandeur. Of course, too much door opening and closing force will make some users more strenuous to operate, while too little door opening and closing force will easily cause the door to slip and produce a floating feeling.

[0003] Since the door opening and closing force and door closing energy directly affect the user experience, it is very necessary to design the door opening and closing force and door closing energy based on the user experience and the actual vehicle benchmark. The existing door closing energy analysis is mainly carried out in the following ways, such as the energy balance method given in Chinese patent CN113758722B. First, the minimum door closing speed of the car door is determined, and the door kinetic energy is converted by the minimum door closing speed. The sealing strip, door lock, cavity resistance, etc. are designed by energy balance (that is, the door kinetic energy is equal to the work done by the cavity resistance of the passenger compartment, the work done by the compression force of the sealing strip, the work done by the air resistance of the sealing strip, the work done by the resistance of the door lock, mechanical friction, and damping dissipation). However, the main defect of the above method is that only the door kinetic energy corresponding to the minimum door closing speed is decomposed as the total energy to guide the parameter design of each energy storage or dissipation component, and the realization method of the door kinetic energy is not considered. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes an analysis method and system for vehicle door opening and closing design, which ensures the smoothness and continuity of the actual vehicle door closing by accurately simulating and designing the actual vehicle door opening and closing force and actual vehicle door closing energy.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An analysis method for vehicle door opening and closing design comprises the following steps:

[0007] Test the preset door opening and closing force of a standard vehicle as the target door opening force and the target door closing force; test the minimum door closing speed of the standard vehicle;

[0008] Collect the mass center mass and moment of inertia of each component of the door assembly; assemble the mass center mass and moment of inertia in the vehicle coordinate system, and then convert them to the rotation coordinate system and calculate the measuring point arm; calculate the target door closing energy using the minimum door closing speed and the measuring point arm;

[0009] The multi-body dynamics modeling is performed using the door assembly and the key point coordinates of the door, and the gravity energy storage of the door is calculated without a stopper; under the action of gravity, the stopper door opening torque is added to the multi-body dynamics model to calculate the door opening force; and after the door assembly is statically rotated to the maximum opening state, the stopper door closing torque is added to calculate the door closing force; and the door closing energy is calculated using the door closing force;

[0010] The door opening force is compared with the target door opening force, the door closing force is compared with the target door closing force, and the door closing energy is compared with the target door closing energy until the door opening and closing forces and the door closing energy meet the design requirements of the vehicle.

[0011] Furthermore, the detailed process of comparing the door opening force with the target door opening force, the door closing force with the target door closing force, and the door closing energy with the target door closing energy until both the door opening and closing forces and the door closing energy meet the design requirements of the whole vehicle is as follows:

[0012] If the door opening force, door closing force and door closing energy all meet the vehicle design requirements, the door parking slope check is carried out;

[0013] If any design of the door opening force, door closing force and door closing energy does not meet the design requirements of the whole vehicle, the limiter torque and the physical parameters of the door assembly are optimized, and the target door closing energy is re-determined until the door opening force, door closing force and door closing energy all meet the design requirements of the whole vehicle.

[0014] Furthermore, the method also includes: the process of door slope-staying calibration is: the limiter torque and door assembly assembly that satisfy the door opening force, door closing force and door closing energy that meet the vehicle design requirements are subjected to slope-staying calibration analysis respectively; if the requirements of the slope-staying calibration analysis are met, the analysis is terminated and the limiter torque and the physical parameters of the door assembly are output to the product; if the requirements are not met, the limiter torque and the physical parameters of the door assembly are optimized until the door slope-staying calibration is passed.

[0015] Furthermore, the minimum door closing speed of a standard vehicle is the linear speed of a specific point on the door at a specific door opening when the door is just closed;

[0016] The point of application of the door opening and closing force is the midpoint of the outside opening handle, and the measurement point of the minimum door closing speed is the projection point of the door lock engagement point on the door outer panel.

[0017] Furthermore, after assembling the mass center mass and the moment of inertia in the vehicle coordinate system, the process of converting them into the rotating coordinate system and calculating the measuring point arm includes:

[0018] In the vehicle coordinate system, the center of mass mass and moment of inertia are assembled to obtain the center of mass mass and moment of inertia of the door assembly in the closed state;

[0019] A rotating coordinate system is established with the center of mass of the door assembly as the origin, the line from the lower hinge axis to the upper hinge axis as the z-axis, and the plane where the z-axis and the midpoint of the outside handle are located as the xz plane; the center of mass mass and moment of inertia of the door assembly in the closed state are converted into the rotating coordinate system to calculate the measuring point force arm.

[0020] Furthermore, the process of calculating the target door closing energy using the minimum door closing speed and the measuring point force arm includes:

[0021]

[0022] Wherein, E is the target door closing energy; J is the moment of inertia of the door relative to the z-axis in the rotating coordinate system; ω is the door rotation speed; ω=v / l; v is the minimum door closing speed; l is the measuring point force arm.

[0023] Furthermore, the process of calculating the gravity energy storage of the door without a limiter is as follows: a motion simulation of the door assembly without a limiter under the action of gravity is performed, the door opening force from the closed state to the maximum opening state is analyzed, and the force and displacement are integrated to obtain the gravity energy storage of the door.

[0024] Furthermore, under the action of gravity, the process of calculating the door opening force by adding the door opening torque of the limiter on the basis of the multi-body dynamics model is as follows: under the action of gravity, the limiter is added on the basis of the multi-body dynamics model to analyze the door opening force from the closed state to the maximum opening state.

[0025] Furthermore, under the action of gravity, the door assembly is statically rotated to the maximum opening state, and then the limiter closing torque is added to calculate the closing force. The process is as follows: under the action of gravity, the door assembly is statically rotated to the maximum opening state, and then the limiter closing torque is added. The closing force of the door from the maximum opening to the closed state is obtained through multi-body dynamics model analysis.

[0026] The present invention also proposes an analysis system for vehicle door opening and closing design, comprising a preprocessing module, a first calculation module, a second calculation module and a comparison analysis module;

[0027] The preprocessing module is used to test the preset door opening and closing force of a standard vehicle as a target door opening force and a target door closing force; and to test the minimum door closing speed of the standard vehicle;

[0028] The first calculation module is used to collect the mass center mass and moment of inertia of each component of the door assembly; after assembling the mass center mass and moment of inertia in the vehicle coordinate system, convert them into the rotation coordinate system and calculate the measuring point arm; calculate the target door closing energy using the minimum door closing speed and the measuring point arm;

[0029] The second calculation module is used to perform multi-body dynamics modeling using the door assembly and the key point coordinates of the door, calculate the gravity energy storage of the door without a stopper; under the action of gravity, add the stopper door opening torque on the basis of the multi-body dynamics model to calculate the door opening force; and after the door assembly is statically rotated to the maximum opening state, add the stopper door closing torque to calculate the door closing force; and use the door closing force to calculate the door closing energy;

[0030] The comparison and analysis module is used to compare the door opening force with the target door opening force, the door closing force with the target door closing force, and the door closing energy with the target door closing energy, until the door opening and closing forces and the door closing energy meet the design requirements of the entire vehicle.

[0031] The effects provided in the content of the invention are only the effects of the embodiments, not all the effects of the invention. One of the above technical solutions has the following advantages or beneficial effects:

[0032] The present invention proposes an analysis method and system for vehicle door opening and closing design, the method comprising the following steps: testing the door opening and closing force of a preset standard vehicle as a target door opening force and a target door closing force; testing the minimum door closing speed of the standard vehicle; collecting the mass center mass and moment of inertia of each component of the door assembly; assembling the mass center mass and moment of inertia in the whole vehicle coordinate system, and then converting them to the rotation coordinate system and calculating the measuring point force arm; calculating the target door closing energy by using the minimum door closing speed and the measuring point force arm; and calculating the target door closing energy by using the door assembly and the door key The multi-body dynamics modeling is carried out based on the point coordinates, and the gravity energy storage of the door is calculated without a limiter; under the action of gravity, the limiter door opening torque is added on the basis of the multi-body dynamics model to calculate the door opening force; and the door assembly assembly is statically rotated to the maximum opening state, and the limiter door closing torque is added to calculate the door closing force; the door closing energy is calculated using the door closing force; the door opening force is compared with the target door opening force, the door closing force is compared with the target door closing force, and the door closing energy is compared with the target door closing energy, until the door opening and closing force and the door closing energy meet the design requirements of the whole vehicle. Based on an analysis method for vehicle door opening and closing design, an analysis system for vehicle door opening and closing design is also proposed. The present invention combines subjective force sense and objective door opening and closing force test data for target setting, achieves the subjective force sense target through objective data target achievement, combines the physical parameters of the door assembly assembly and the limiter torque to analyze the door opening and closing force and door closing energy, and considers the door stopping performance, which can accurately simulate and design the actual vehicle door opening and closing force and design the actual vehicle door closing energy. The present invention can accurately design the smoothness and continuity of closing a door on a real vehicle, thereby improving the door opening and closing operation quality and customer experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A flow chart of an analysis method for vehicle door opening and closing design proposed in Example 1 of the present invention;

[0034] Figure 2 The minimum door closing speed measurement point and door position diagram proposed in Example 1 of the present invention;

[0035] Figure 3 This is a schematic diagram of the target door opening force and the target door closing force proposed in Example 1 of the present invention;

[0036] Figure 4 A schematic diagram of the limit switch torque proposed in Example 1 of the present invention;

[0037] Figure 5 A schematic diagram of a parameterized model of a vehicle door assembly proposed in Example 1 of the present invention;

[0038] Figure 6 This is a schematic diagram of the self-closing performance and energy analysis of a door without a stopper proposed in Example 1 of the present invention;

[0039] Figure 7This is a schematic diagram of the analysis of the door opening and closing force and the door closing energy when a limiter is provided in Example 1 of the present invention;

[0040] Figure 8 This is a schematic diagram of the door closing continuity analysis proposed in Example 1 of the present invention;

[0041] Fig. 9 This is a schematic diagram of the door parking slope verification proposed in Example 1 of the present invention;

[0042] Fig.10 Schematic diagram of an analysis system designed for a vehicle door opening and closing proposed in Example 2 of the present invention. DETAILED DESCRIPTION

[0043] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings. The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the accompanying drawings are not necessarily drawn to scale. The present invention omits the description of known components and processing techniques and processes to avoid unnecessary limitations on the present invention.

[0044] Example 1

[0045] The first embodiment of the present invention proposes an analysis method for the design of vehicle door opening and closing, which is used to solve the problem that the door closing energy is not accurately designed in the prior art. The present invention realizes the positive development of the mechanical quality of the door opening and closing based on the user experience through the physical parameters of the door assembly and the torque design of the limiter.

[0046] In the analysis method for vehicle door opening and closing design proposed in Example 1 of the present invention, the factors affecting the door opening and closing force include the physical parameters of the door (gravity), the limiter torque, and the hinge friction. Under normal circumstances, the hinge friction is very small (less than 1N), so the present invention ignores its influence.

[0047] The factors affecting the door closing energy include the physical parameters of the door (work done by gravity), the torque work of the stopper, the friction energy consumption of the hinge, and the work done by the user's door closing force. Under normal circumstances, the hinge friction force is very small (less than 1N), and its friction energy consumption can be ignored when the door travel is short. When the door travel is large, it has a small impact on the energy value, but it can be ignored in actual engineering, so the present invention ignores its impact. Since there is obvious randomness in the user's door closing work, the present invention takes the door closing energy as the minimum door closing speed target when the user's work is 0 as the design premise.

[0048] Figure 1 A flow chart of an analysis method for vehicle door opening and closing design proposed in Example 1 of the present invention;

[0049] In step S100, a preset door opening and closing force of a standard vehicle is tested as a target door opening force and a target door closing force; and a minimum door closing speed of the standard vehicle is tested.

[0050] Pre-selection of relevant models to identify standard vehicles by performance scoring. Test the door opening and closing force of standard vehicles, with the door opening and closing force application point being the midpoint of the external opening handle.

[0051] The minimum door closing speed refers to the linear speed of a specific point on the door at a specific door opening under the condition that the door can be just closed by repeatedly closing the door, and the unit is m / s. The measurement point (specific point) of the minimum door closing speed is the projection point of the door lock engagement point on the door outer panel, and the corresponding door position (specific opening) is the door edge point obtained by translating the projection point to the door edge. The door opening when the door edge point is 80mm away from the split seam is the door position during the minimum door closing speed test. Figure 2 This is the minimum door closing speed measurement point and door position diagram proposed in Example 1 of the present invention; under normal circumstances, the door in this opening state is just out of contact with the sealing strip. For some special cases where there is contact with the sealing strip, the distance from the door edge point to the parting seam is appropriately increased so that the door opening when the door is just out of contact with the sealing strip is used as the test position for the minimum door closing speed.

[0052] The door opening and closing force test results are sorted out to obtain the target door opening and closing force. Figure 3 This is a schematic diagram of the target door opening force and target door closing force proposed in Example 1 of the present invention; the minimum door closing speed is 0.85m / s, which corresponds to a door opening of 4.5°, a maximum door opening of 65°, and a limiter of level 3. Among them, the door opening force focuses on the door opening of 5-20°, Figure 3 The medium-thick line segment is the process of user feel establishment, which is highly correlated with the subjective door opening force. The door opening and closing shift force is the maximum static operating force required by the user. As mentioned above, it should not be too large or too small. In this example, the target shift forces for opening the door 1 to 3 are 37, 39, and 42 ± 2N respectively. Figure 3 The target shift forces for closing the door from 3rd to 1st gear are 48, 42, 37±2N respectively. Figure 3 Middle dot.

[0053] In step S200, the center of mass mass and inertia / moment of inertia of each component of the door assembly are collected. The door assembly refers to the set of components on the door that rotate when the door is opened or closed, involving multiple product specialties such as body, interior and exterior decoration, and electrical appliances. Engineers of each product specialty need to provide the center of mass and inertia / moment of inertia of each component. The reference coordinate system is the vehicle coordinate system, and the inertia / moment of inertia reference point of each component is its center of gravity. Table 1 below is a parameter table of each component of the door assembly in the vehicle coordinate system, where the inertia / moment of inertia of components with a single mass of less than 1kg is ignored.

[0054] Table 1: Parameters of the door assembly components in the vehicle coordinate system

[0055]

[0056]

[0057] Collect key point coordinates, including upper / lower hinge axis coordinates, minimum door closing speed measurement point coordinates, and outside handle midpoint coordinates. The outside handle midpoint coordinates are divided into door closed state and maximum opening state. The door inclination angle can be obtained through the hinge axis coordinates. Table 2 below shows the key point coordinates and inclination angles of the door in the vehicle coordinate system.

[0058] Table 2: Coordinates and inclination angles of key points of the door in the vehicle coordinate system

[0059]

[0060] Collect the limiter switch torque. The product engineer provides the initial version of the limiter torque or designs it by himself. The horizontal axis is the door opening, and the vertical axis is the torque. In this embodiment, data is collected at an opening interval of 0.5°. It is stipulated that the torque of the user keeping the door open and closed at a uniform speed through the external opening handle under the action of the limiter is the limiter torque. The door opening torque is positive and the door closing torque is negative. The limiter switch torque is as follows: Figure 4 As shown. It should be noted that the torque is the torque around the hinge axis, and there may be an angle with the Z axis of the vehicle coordinate system. From the limiter torque parameters, fill in the door opening torque when the door is open and the door opening value when the limiter torque is 0 when the door is about to fall into the first gear into Table 3.

[0061] Table 3: Key torque parameters of limiter

[0062]

[0063] In step S300, the mass center mass and the moment of inertia are assembled in the vehicle coordinate system and then converted to the rotation coordinate system and the measuring point arm is calculated; the target door closing energy is calculated using the minimum door closing speed and the measuring point arm.

[0064] In this application, the mass center mass and moment of inertia are assembled in the vehicle coordinate system to obtain the mass center mass and inertia / moment of inertia of the door assembly in the closed state, where the reference point of the inertia / moment of inertia is the mass center of the door assembly. The door assembly is rotated to the maximum opening to obtain the coordinates of the center of mass in the maximum opening state.

[0065] The rotation coordinate system is established with the center of mass of the door assembly as the origin, the line from the lower hinge axis to the upper hinge axis as the z axis, and the plane where the z axis and the midpoint of the external opening handle are located as the xz plane; the center of mass mass and moment of inertia of the door assembly in the closed state are converted to the rotation coordinate system and the distance from the center of mass, the minimum door closing speed measurement point, and the midpoint of the external opening handle to the z axis of the rotation coordinate system are calculated and named as the center of mass force arm, measurement point force arm, and handle force arm respectively. Table 4 below is the parameter table of the door assembly.

[0066] Table 4: Door assembly parameters

[0067]

[0068] Calculation of door closing energy: The movement of the door of a real vehicle is rotation around the hinge axis, and the hinge axis is the coordinate line of the upper / lower hinge axis. The process of calculating the target door closing energy using the minimum door closing speed and the measuring point force arm includes:

[0069]

[0070] Wherein, E is the target door closing energy; J is the moment of inertia of the door relative to the z-axis in the rotating coordinate system; ω is the door rotation speed; ω=v / l; v is the minimum door closing speed; l is the measuring point force arm.

[0071] In this application, J = 4.237 + 46.5 * 0.539 * 0.539 = 17.75, the unit is kgm 2 ; The unit is rad / s;

[0072] The corresponding door closing target energy is: E=0.5*17.75*0.78*0.78=5.4, in joules J. That is, when closing the door, the target door closing speed at a door opening of 4.5° is 0.85 m / s, and the corresponding door kinetic energy is 5.4 J.

[0073] In step S400, the door assembly and the key point coordinates of the door are used to perform multi-body dynamics modeling, and the gravity energy storage of the door is calculated without a stopper; Figure 5This is a schematic diagram of the parametric model of the door assembly proposed in Example 1 of the present invention; based on the Adams multi-body dynamics analysis software, the door assembly in the closed state is parametrically modeled, and the model includes the mass center mass, inertia / moment of inertia, and the coordinates of the upper and lower hinge axes and the coordinates of the midpoint of the external opening handle of the door assembly. The global coordinate system is the coordinate system of the entire vehicle, the center of mass of the door assembly, the upper and lower hinge axes, and the midpoint of the external opening handle are established based on the global coordinate system, and the inertia / moment of inertia of the door assembly is established based on the rotation coordinate system.

[0074] Add a revolute pair to the upper hinge axis or the lower hinge axis so that the door can rotate around the z-axis of the rotation coordinate system. Add a vertical downward gravity field in the vehicle coordinate system to simulate the effect of gravity on the physical door. Add a drive at the midpoint of the external opening handle, and the drive mode is to rotate the door around the z-axis of the rotation coordinate system at an angular velocity of 50deg / s. Perform simulation calculations with a step size of 0.01s and a duration of 1.3s, that is, an interval of 0.5deg (consistent with the limiter torque angle interval), to simulate the force results from the door closed state to the 65° maximum opening state. In this application, deg and ° have the same meaning.

[0075] Extract the torque of the midpoint of the external handle around the z-axis of the rotating coordinate system during the full door opening stroke, and integrate the torque with the door opening angle to obtain the energy. This energy is the kinetic energy of the door closing automatically under the action of gravity, such as Figure 6 As shown in the energy curve, the energy curve indicates that the greater the door opening is, the more energy the door gains from the opening to the closing. The torque is converted into force through the handle arm described in Table 4. This force is the force required by the external opening handle to keep the door stationary under the action of gravity, that is, the minimum door opening force required by the user. Figure 6 This is a schematic diagram of the self-closing performance and energy analysis of a door without a stopper proposed in Example 1 of the present invention;

[0076] The door closing energy when the door opening is 26° (the position about to fall into the first gear in Table 3) is marked separately (4.8J), such as Figure 6 By comparing with the target door closing energy (5.4J) in step S300, it can be seen that when the door slides out of the first gear and closes, in addition to the work done by gravity, the limiter needs to provide 0.6J. This analysis can be used for the selection of limiters at the beginning of the design. By judging whether a high-energy limiter is needed based on the energy difference, it can save product costs while ensuring good self-closing performance of the door.

[0077] In step S500, under the action of gravity, the stopper door opening torque is added on the basis of the multi-body dynamics model to calculate the door opening force; the torque reference line (point) is the hinge axis (upper hinge axis or lower hinge axis point), and according to the simulation settings of step S400 above, the handle torque is calculated and the door opening force is extracted. It is stipulated that under the action of gravity and the stopper, the force that keeps the door opening at a uniform speed through the external opening handle is positive, Figure 7 This is a schematic diagram of the analysis of the door opening and closing force and the door closing energy when a limiter is provided in Example 1 of the present invention;

[0078] And after the door assembly is statically rotated to the maximum opening state, the closing torque of the limiter is added to calculate the closing force; the closing energy is calculated using the closing force; and a closing force analysis model is established, in which the initial state of the door is the maximum opening position. The closing torque of the limiter is added to the model, a vertical downward gravity field is added in the vehicle coordinate system, and a drive is added to the midpoint of the external opening handle. The drive mode is to rotate the door around the z-axis of the rotating coordinate system at an angular velocity of 50deg / s to close the door. The simulation calculation is performed with a step size of 0.01s and a duration of 1.3s. The handle torque of the door is simulated from the maximum opening state of 65° to the closed state. The closing force extraction method is the same as the opening force. It is stipulated that the force that keeps the door closing at a uniform speed through the external opening handle under the action of gravity and the limiter is positive, and the closing force analysis result is as follows Figure 7 The closing force is shown in Figure 2. The closing energy is obtained by integrating the handle torque during the closing stroke with the closing angle.

[0079] In step S600, it is determined whether the door opening and closing force and the door closing energy meet the design requirements, and if so, step S700 is executed. If not, step S800 is executed.

[0080] The door opening force is compared with the target door opening force, the door closing force is compared with the target door closing force, and the door closing energy is compared with the target door closing energy until the door opening and closing forces and the door closing energy meet the design requirements of the vehicle.

[0081] Depend on Figure 7 It can be seen that in the door opening stroke from 5 to 20 degrees, the front section (5 to 15 degrees) of the door opening force is about 4N higher than the target force, and the door opening and closing shift force meets the target requirements. Considering that the door size (measurement point force arm 1089mm) and weight (46.5kg) are both large, under the premise of appropriate shift force, the front section of the door opening force is slightly larger than the target to obtain a heavier door opening force feeling, which meets the user's subjective expectations of the door opening force feeling, and therefore the door opening force is judged to be qualified.

[0082] Depend on Figure 7It can be seen that: the car door starts to close quasi-statically (that is, the door speed can be regarded as 0) from the 1st gear (about 29°), and is released when it enters the self-closing door opening (about 26°). The energy when the car door moves from 26° to 4.5° is 6.1-0.65=5.45J, which is greater than the target door closing energy (5.4J), and can achieve good self-closing performance of the door.

[0083] If the door opening force, door closing force and door closing energy all meet the design requirements of the vehicle, the door slope check is carried out; if any of the designs of the door opening force, door closing force and door closing energy do not meet the design requirements of the vehicle, the limiter torque and the physical parameters of the door assembly are optimized, and the target door closing energy is re-determined until the door opening force, door closing force and door closing energy all meet the design requirements of the vehicle. Figure 8 Schematic diagram of the door closing continuity analysis proposed in Example 1 of the present invention; when the door starts to close quasi-statically from the 2nd gear (about 43°) and enters the self-closing opening (about 39.5°), if Figure 8 When the area of ​​zone 2 is not less than that of zone 1, the door can overcome the resistance of level 1 and complete the door closing; when the door starts to close quasi-statically from level 3 (about 63°) and enters the self-closing door opening (about 58°), it is released. Figure 8 When the area of ​​the middle region 4 is not less than that of the region 3, the door can overcome the resistance of the second gear and continue to close. At the same time, if the area of ​​the region 2 is not less than that of the region 1, the door can overcome the resistance of the first gear and complete the closing. In this embodiment, the area of ​​the region 4 is larger than that of the region 3, and the area of ​​the region 2 is larger than that of the region 1, and the door can complete a continuous and smooth closing process from the third gear.

[0084] In step S700, it is determined whether the door hill-holding check has passed, if so, step S900 is executed, otherwise, step S800 is executed.

[0085] The specific process of the door slope checking is as follows: the limiter torque and door assembly that satisfy the door opening force, door closing force and door closing energy that meet the vehicle design requirements are subjected to slope checking analysis respectively. If the requirements of the slope checking analysis are met, the analysis is terminated and the limiter torque and the physical parameters of the door assembly are output to the product; if the requirements are not met, the limiter torque and the physical parameters of the door assembly are optimized until the door slope checking is passed.

[0086] This embodiment performs 13° (23%) uphill / downhill parking verification, that is, the gravity field loading is: when going uphill, the vehicle coordinate system Z direction is -0.974G, and the X direction is 0.225G; when going downhill, the vehicle coordinate system Z direction is -0.974G, and the X direction is -0.225G.

[0087] The handle torque and limiter torque obtained by analysis are organized into a chart. Fig. 9 Schematic diagram of door parking slope verification proposed in Embodiment 1 of the present invention; Fig. 9It can be seen that when opening the door downhill, all gears can meet the hill-holding requirements, and when opening the door uphill, only the 1st and 2nd gears can meet the hill-holding requirements. If the 3rd gear hill-holding requirements need to be met, the physical parameters of the door assembly (center of mass mass, inclination angle) must be adjusted to reduce the gravity component force or increase the 3rd gear door closing torque of the stopper. Since the 3rd gear shift force analysis result in step 600 of this embodiment is equivalent to the target force, further increasing the limiter torque will make it difficult for the user to close the door, so the preferred method is to change the door inclination angle to reduce the gravity component force. However, this embodiment believes that when the door opening and closing force and the door closing energy are both appropriate, the 3rd gear hill-holding performance when going uphill can be appropriately sacrificed (this example does not meet the hill-holding requirements when going uphill at 13°, but meets the hill-holding requirements when going uphill at 10°). The reason is that for most usage scenarios, the hill-holding requirements in 1st and 2nd gears can meet the usage requirements, so the hill-holding results are accepted.

[0088] In step S800, the limiter torque, door inclination angle and door assembly mass distribution are adjusted.

[0089] In step S900, the physical parameters (inclination angle, center of mass mass, inertia / moment of inertia) and limiter torque parameters of the door assembly that meet the door opening and closing force and door closing energy targets and pass the slope verification are input to the product engineer for product design.

[0090] The analysis method for vehicle door opening and closing design proposed in Example 1 of the present invention combines subjective force sense and objective door opening and closing force test data for target setting, achieves the subjective force sense target through objective data target achievement, combines the physical parameters of the door assembly and the limiter torque to analyze the door opening and closing force and door closing energy, and considers the door stopping performance, which can accurately simulate and design the actual vehicle door opening and closing force and design the actual vehicle door closing energy. The present invention can accurately design the smoothness and continuity of the actual vehicle door closing, and improve the door opening and closing operation quality and customer experience.

[0091] Example 2

[0092] Based on the analysis method for vehicle door opening and closing design proposed in the first embodiment of the present invention, the second embodiment of the present invention further proposes an analysis system for vehicle door opening and closing design. Fig.10 A schematic diagram of an analysis system for a vehicle door opening and closing design proposed in Embodiment 2 of the present invention, the system comprising a preprocessing module, a first calculation module, a second calculation module and a comparison analysis module;

[0093] The pre-processing module is used to test the door opening and closing force of a preset standard vehicle as the target door opening force and the target door closing force; and to test the minimum door closing speed of the standard vehicle;

[0094] The first calculation module is used to collect the mass center mass and moment of inertia of each component of the door assembly; after assembling the mass center mass and moment of inertia in the vehicle coordinate system, convert them into the rotation coordinate system and calculate the measuring point arm; calculate the target door closing energy using the minimum door closing speed and the measuring point arm;

[0095] The second calculation module is used to perform multi-body dynamics modeling using the door assembly and the key point coordinates of the door, calculate the gravity energy storage of the door without a stopper; under the action of gravity, add the stopper door opening torque on the basis of the multi-body dynamics model to calculate the door opening force; and after the door assembly is statically rotated to the maximum opening state, add the stopper door closing torque to calculate the door closing force; and use the door closing force to calculate the door closing energy;

[0096] The comparative analysis module is used to compare the door opening force with the target door opening force, the door closing force with the target door closing force, and the door closing energy with the target door closing energy, until the door opening and closing forces and the door closing energy meet the design requirements of the vehicle. The specific process is: if the door opening force, door closing force and door closing energy meet the design requirements of the vehicle, then the door parking slope check is performed; if any design of the door opening force, door closing force and door closing energy does not meet the design requirements of the vehicle, then the limiter torque and the physical parameters of the door assembly are optimized, and the target door closing energy is re-determined until the door opening force, door closing force and door closing energy meet the design requirements of the vehicle.

[0097] The system also includes a slope-holding calibration module. The specific process is: the limiter torque and door assembly that meet the door opening force, door closing force and door closing energy requirements of the vehicle design are subjected to slope-holding calibration analysis respectively. If the requirements of the slope-holding calibration analysis are met, the analysis is terminated and the limiter torque and the physical parameters of the door assembly are output to the product; if the requirements are not met, the limiter torque and the physical parameters of the door assembly are optimized until the door slope-holding calibration is passed.

[0098] Among them, in the preprocessing module, the minimum door closing speed of a standard vehicle is the linear speed of a specific point on the door at a specific door opening under the condition that the door is just closed; the force application point of the door opening and closing force is the midpoint of the external opening handle, and the measurement point of the minimum door closing speed is the projection point of the door lock engagement point on the door outer panel.

[0099] Among them, in the first calculation module, after assembling the center of mass mass and moment of inertia in the whole vehicle coordinate system, the process of converting them into a rotating coordinate system and calculating the measuring point force arm includes: in the whole vehicle coordinate system, assembling the center of mass mass and moment of inertia to obtain the center of mass mass and moment of inertia of the door assembly in the closed state; establishing a rotating coordinate system with the center of mass of the door assembly as the origin, the line from the lower hinge axis to the upper hinge axis as the z-axis, and the plane where the z-axis and the midpoint of the external opening handle are located as the xz plane; converting the center of mass mass and moment of inertia of the door assembly in the closed state into the rotating coordinate system to calculate the measuring point force arm.

[0100] The process of calculating the target closing energy using the minimum closing speed and the measuring point force arm includes:

[0101]

[0102] Wherein, E is the target door closing energy; J is the moment of inertia of the door relative to the z-axis in the rotating coordinate system; ω is the door rotation speed; ω=v / l; v is the minimum door closing speed; l is the measuring point force arm.

[0103] Among them, in the second calculation module, the process of calculating the gravity energy storage of the car door without a limiter is: the car door assembly without a limiter under the action of gravity is subjected to motion simulation, the door opening force from the closed state to the maximum opening state is analyzed, and the force and displacement are integrated to obtain the gravity energy storage of the car door.

[0104] Under the action of gravity, the door opening torque of the limiter is added on the basis of the multi-body dynamics model to calculate the process of the door opening force: Under the action of gravity, the limiter is added on the basis of the multi-body dynamics model to analyze the door opening force from the closed to the maximum opening state.

[0105] Under the action of gravity, the door assembly is statically rotated to the maximum opening state, and then the limiter closing torque is added to calculate the closing force. The process is as follows: Under the action of gravity, the door assembly is statically rotated to the maximum opening state, and then the limiter closing torque is added. The closing force of the door from the maximum opening to the closed state is obtained through multi-body dynamics model analysis.

[0106] The analysis system for vehicle door opening and closing design proposed in Example 2 of the present invention combines subjective force sense and objective door opening and closing force test data for target setting, achieves subjective force sense target through objective data target achievement, combines door assembly physical parameters and limiter torque for door opening and closing force and door closing energy analysis and considers door hill holding performance, and can accurately simulate and design actual vehicle door opening and closing force and actual vehicle door closing energy. The present invention can accurately design the smoothness and continuity of actual vehicle door closing, and improve the door opening and closing operation quality and customer experience.

[0107] For the description of the relevant parts of the analysis system for a vehicle switch door design provided in Example 2 of the present application, please refer to the detailed description of the corresponding parts in the analysis method for a vehicle switch door design provided in Example 1 of the present application, and will not be repeated here.

[0108] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment that includes a series of elements are inherent to the elements. In the absence of more restrictions, the elements limited by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or equipment that includes the elements. In addition, the above-mentioned technical solution provided in the embodiment of the present application is consistent with the corresponding technical solution in the prior art in principle, and the part is not described in detail, so as not to repeat too much.

[0109] Although the above describes the specific implementation of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. For those skilled in the art, other different forms of modifications or deformations can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. On the basis of the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. An analysis method for vehicle door opening and closing design, characterized in that: The following steps are involved: Testing the door opening and closing force of a preset standard vehicle as the target door opening force and the target door closing force; Test the minimum door closing speed of standard vehicles; Collect the mass center mass and moment of inertia of each component of the door assembly; assemble the mass center mass and moment of inertia in the vehicle coordinate system, and then convert them to the rotation coordinate system and calculate the measuring point arm; calculate the target door closing energy using the minimum door closing speed and the measuring point arm; The door assembly and the key point coordinates of the door are used to perform multi-body dynamics modeling, and the door gravity energy storage is calculated without a stopper. Under the action of gravity, the door opening force is calculated by adding the door opening torque of the stopper on the basis of the multi-body dynamics model; and calculating the door closing force by adding the door closing torque of the stopper after the door assembly is statically rotated to the maximum opening state; Calculating the door closing energy using the door closing force; The door opening force is compared with the target door opening force, the door closing force is compared with the target door closing force, and the door closing energy is compared with the target door closing energy until the door opening and closing forces and the door closing energy meet the design requirements of the vehicle.

2. The analysis method for vehicle door opening and closing design according to claim 1 is characterized in that: The detailed process of comparing the door opening force with the target door opening force, the door closing force with the target door closing force, and the door closing energy with the target door closing energy until both the door opening and closing forces and the door closing energy meet the vehicle design requirements is as follows: If the door opening force, door closing force and door closing energy all meet the vehicle design requirements, the door parking slope check is carried out; If any design of the door opening force, door closing force and door closing energy does not meet the design requirements of the whole vehicle, the limiter torque and the physical parameters of the door assembly are optimized, and the target door closing energy is re-determined until the door opening force, door closing force and door closing energy all meet the design requirements of the whole vehicle.

3. The analysis method for vehicle door opening and closing design according to claim 1 is characterized in that: The method also includes: the process of door slope checking is: the limiter torque and door assembly assembly that meet the requirements of the vehicle design for door opening force, door closing force and door closing energy are respectively subjected to slope checking analysis; if the requirements of the slope checking analysis are met, the analysis is terminated and the limiter torque and the physical parameters of the door assembly are output to the product; if the requirements are not met, the limiter torque and the physical parameters of the door assembly are optimized until the door slope checking is passed.

4. The analysis method for vehicle door opening and closing design according to claim 1 is characterized in that: The minimum door closing speed of a standard vehicle is the linear speed of a specific point on the door at a specific door opening when the door is just closed. The point of application of the door opening and closing force is the midpoint of the outside opening handle, and the measurement point of the minimum door closing speed is the projection point of the door lock engagement point on the door outer panel.

5. The analysis method for vehicle door opening and closing design according to claim 1, characterized in that: After assembling the mass center mass and the moment of inertia in the vehicle coordinate system, the process of converting them into the rotating coordinate system and calculating the measuring point force arm includes: In the vehicle coordinate system, the center of mass mass and moment of inertia are assembled to obtain the center of mass mass and moment of inertia of the door assembly in the closed state; A rotating coordinate system is established with the center of mass of the door assembly as the origin, the line from the lower hinge axis to the upper hinge axis as the z-axis, and the plane where the z-axis and the midpoint of the outside handle are located as the xz plane; the center of mass mass and moment of inertia of the door assembly in the closed state are converted into the rotating coordinate system to calculate the measuring point force arm.

6. The analysis method for vehicle door opening and closing design according to claim 5, characterized in that: The process of calculating the target door closing energy using the minimum door closing speed and the measuring point force arm includes: Wherein, E is the target door closing energy; J is the moment of inertia of the door relative to the z-axis in the rotating coordinate system; ω is the door rotation speed; ω=v / l; v is the minimum door closing speed; l is the measuring point force arm.

7. The analysis method for vehicle door opening and closing design according to claim 1, characterized in that: The process of calculating the gravity energy storage of the door without a limiter is as follows: a motion simulation of the door assembly without a limiter under gravity is performed, the door opening force from the closed state to the maximum opening state is analyzed, and the force and displacement are integrated to obtain the gravity energy storage of the door.

8. The analysis method for vehicle door opening and closing design according to claim 1, characterized in that: Under the action of gravity, the door opening torque of the limiter is added on the basis of the multi-body dynamics model to calculate the process of the door opening force: Under the action of gravity, the limiter is added on the basis of the multi-body dynamics model to analyze the door opening force from the closed to the maximum opening state.

9. The analysis method for vehicle door opening and closing design according to claim 1, characterized in that: Under the action of gravity, the door assembly is statically rotated to the maximum opening state, and then the limiter closing torque is added to calculate the closing force. The process is as follows: Under the action of gravity, the door assembly is statically rotated to the maximum opening state, and then the limiter closing torque is added. The closing force of the door from the maximum opening to the closed state is obtained through multi-body dynamics model analysis.

10. An analysis system for vehicle door opening and closing design, characterized in that: It includes a preprocessing module, a first calculation module, a second calculation module and a comparison and analysis module; The preprocessing module is used to test the door opening and closing force of a preset standard vehicle as a target door opening force and a target door closing force; Test the minimum door closing speed of standard vehicles; The first calculation module is used to collect the mass center mass and moment of inertia of each component of the door assembly; after assembling the mass center mass and moment of inertia in the vehicle coordinate system, convert them into the rotation coordinate system and calculate the measuring point arm; calculate the target door closing energy using the minimum door closing speed and the measuring point arm; The second calculation module is used to perform multi-body dynamics modeling using the door assembly and the key point coordinates of the door, and calculate the gravity energy storage of the door without a limiter; Under the action of gravity, the door opening force is calculated by adding the door opening torque of the stopper on the basis of the multi-body dynamics model; and calculating the door closing force by adding the door closing torque of the stopper after the door assembly is statically rotated to the maximum opening state; Calculating the door closing energy using the door closing force; The comparison and analysis module is used to compare the door opening force with the target door opening force, the door closing force with the target door closing force, and the door closing energy with the target door closing energy, until the door opening and closing forces and the door closing energy meet the design requirements of the entire vehicle.

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