Vehicle glass cement state judgment method, device, equipment and medium

Abstract

The invention discloses a vehicle glass cement state judgment method, device and equipment and a medium. The method comprises the following steps: determining upward normal stress of glass on a vehicle relative to the ground when the vehicle passes through a bumping belt; determining the area of glass cement for connecting a vehicle body and the glass; according to the normal stress, the area of the glass cement and the inclination angle of the glass relative to the ground, the tensile stress and the shear stress of the glass cement when the vehicle passes through the bumping belt are calculated; and whether the glass cement is torn or not is determined according to the tensile stress and the shear stress, so that preparation judgment on the state of the glass cement is realized, the detection period and the off-line time of the vehicle are shortened, the vehicle repair cost is reduced, and the quality of the whole vehicle can be effectively improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle testing technology, and in particular to a method, device, equipment and medium for judging the state of vehicle glass glue. Background Art

[0002] As the most common adhesive, polyurethane glass glue is often used to bond the windshield and the car body, and plays an important role in ensuring the driving safety of the vehicle. The main function of glass glue is to ensure that the windshield and the car body can be firmly connected and not fly off when the car is hit. It must also have the function of preventing water and air penetration, dust and noise intrusion, and reducing vibration and noise during vehicle driving.

[0003] During the automobile manufacturing process, a bump test is performed to release assembly stress. During the bump test, the glass glue that bonds the windshield to the body is not fully cured, which poses a risk of tearing. Currently, there is no complete system to detect the bonding status of the windshield and the body sheet metal. It can only be used to determine whether the glass glue is qualified by combining the vehicle's watertightness during the rain test. This results in a long vehicle inspection cycle and high repair costs.

[0004] Therefore, how to judge the state of the glass glue on the vehicle in advance is a technical problem to be solved. Summary of the invention

[0005] The present application provides a method, device, equipment and medium for judging the state of vehicle glass glue, which can solve the technical problem in the prior art that the state of glass glue cannot be accurately judged when the glass glue is not completely cured after the vehicle undergoes a bump test.

[0006] In a first aspect, an embodiment of the present application provides a method for determining a vehicle glass glue state, the method comprising:

[0007] Determine the normal force on the glass of the vehicle in an upward direction relative to the ground when the vehicle passes over a bump strip;

[0008] Determining the area of ​​glass glue used to connect the vehicle body and the glass;

[0009] Calculating the tensile stress and shear stress of the glass glue when the vehicle passes through the bump strip according to the normal force, the area of ​​the glass glue and the inclination angle of the glass relative to the ground;

[0010] Whether the glass glue is torn is determined according to the tensile stress and the shear stress.

[0011] In combination with the first aspect, in one implementation, determining the normal force on the glass of the vehicle relative to the ground when the vehicle passes through a bump strip includes:

[0012] Determine the duration of impact on the glass when the vehicle passes through the bump strip according to the vehicle speed when the vehicle passes through the bump strip and the length of the bump strip;

[0013] Determine the normal speed of the vehicle relative to the ground when passing through the bump strip according to the maximum height difference of the vehicle body and the impact duration of the glass when the vehicle passes through the bump strip;

[0014] The normal force on the glass upward relative to the ground is determined according to the mass of the vehicle, the normal speed and the duration of the impact on the glass.

[0015] In one embodiment, determining the area of ​​glass glue used to connect the vehicle body and the glass includes:

[0016] Obtaining a contact area between the glass glue and the vehicle body according to the product of the bonding width and the bonding length of the glass glue;

[0017] The lateral area of ​​the glass glue perpendicular to the vehicle body is obtained according to the product of the coating width and the bonding length of the glass glue.

[0018] In one embodiment, calculating the tensile stress of the glass glue when the vehicle passes through the bump strip according to the normal force, the area of ​​the glass glue, and the inclination angle of the glass relative to the ground includes:

[0019] F*cosα / S1=σ

[0020] The tensile stress is obtained by calculation, wherein F is the normal force on the glass, α is the inclination angle of the glass relative to the ground, S1 is the contact area between the glass glue and the vehicle body, and σ is the tensile stress.

[0021] In one embodiment, calculating the shear stress of the glass glue when the vehicle passes through the bump strip according to the normal force, the area of ​​the glass glue and the inclination angle of the glass relative to the ground includes:

[0022] F*sinα / S2=τ

[0023] The shear stress is obtained by calculation, wherein F is the normal force of the glass, α is the inclination angle of the glass relative to the ground, S2 is the lateral area of ​​the glass glue perpendicular to the vehicle body, and τ is the shear stress.

[0024] In one embodiment, determining whether the glass glue is torn according to the tensile stress and the shear stress includes:

[0025] Determining whether the tensile stress is less than a preset tensile stress threshold, and whether the shear stress is less than a preset shear stress threshold;

[0026] If so, it is determined that the glass glue is not torn; otherwise, it is determined that the glass glue is torn.

[0027] In one embodiment, the method further comprises:

[0028] Establishing a vehicle dynamics simulation model, and setting kinematic pairs between various components of the vehicle in the vehicle dynamics simulation model;

[0029] Taking the driving torque of the vehicle as the input variable and the tensile stress and shear stress of the glass glue as the state variables, the tensile stress and shear stress of the glass glue when the vehicle passes through the bump strip are solved;

[0030] Whether the glass glue is torn is determined according to the tensile stress and the shear stress.

[0031] In a second aspect, an embodiment of the present application provides a device for determining the state of glass glue of a vehicle, the device comprising:

[0032] A first determination module, which is used to determine the normal force on the glass of the vehicle in the upward direction relative to the ground when the vehicle passes through a bump strip;

[0033] A second determination module, which is used to determine the area of ​​glass glue used to connect the vehicle body and the glass;

[0034] A calculation module, which is used to calculate the tensile stress and shear stress of the glass glue when the vehicle passes through the bump strip according to the normal force, the area of ​​the glass glue and the inclination angle of the glass relative to the ground;

[0035] The third determination module is used to determine whether the glass glue is torn according to the tensile stress and the shear stress.

[0036] In a third aspect, an embodiment of the present application provides a vehicle glass glue status judgment device, wherein the vehicle glass glue status judgment device includes a processor, a memory, and a vehicle glass glue status judgment program stored in the memory and executable by the processor, wherein when the vehicle glass glue status judgment program is executed by the processor, the steps of the vehicle glass glue status judgment method as described in any one of the above items are implemented.

[0037] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a vehicle glass glue status judgment program is stored, wherein when the vehicle glass glue status judgment program is executed by a processor, the steps of the vehicle glass glue status judgment method as described in any one of the above items are implemented.

[0038] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0039] The embodiments of the present application provide a method, device, equipment and medium for judging the state of glass glue on a vehicle, by determining the normal force applied to the glass on the vehicle relative to the ground when the vehicle passes through a bumpy strip; determining the area of ​​the glass glue used to connect the vehicle body and the glass; calculating the tensile stress and shear stress of the glass glue when the vehicle passes through the bumpy strip based on the normal force, the area of ​​the glass glue and the inclination angle of the glass relative to the ground; determining whether the glass glue is torn based on the tensile stress and the shear stress, thereby achieving a preliminary judgment on the state of the glass glue, shortening the vehicle's inspection cycle and offline time, reducing the vehicle repair cost, and being able to effectively improve the quality of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a flow chart of an embodiment of a method for determining the state of glass glue of a vehicle according to the present application;

[0041] Figure 2 This is a schematic diagram of the forces acting on the vehicle of this application when it passes through a bump strip;

[0042] Figure 3 This is a schematic diagram of the glass glue state after the glass is assembled on the vehicle of this application;

[0043] Figure 4 This is a schematic diagram of the change trend of tensile stress when the vehicle of this application passes through a bump strip;

[0044] Figure 5 This is a schematic diagram of the change trend of shear stress when the vehicle of this application passes through a bump strip;

[0045] Figure 6 This is a schematic diagram of the force direction of the front windshield of the vehicle in this application;

[0046] Figure 7 This is a functional module diagram of an embodiment of a device for determining the state of glass glue of a vehicle according to the present application;

[0047] Figure 8 This is a schematic diagram of the hardware structure of a vehicle glass glue state judgment device involved in the embodiment of the present application;

[0048] Figure 3 In: 1. Front windshield; 2. Glass glue; 3. Body sheet metal. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the solution of the present application, 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 only 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 creative work are within the scope of protection of this application.

[0050] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0051] In a first aspect, an embodiment of the present application provides a method for determining the state of glass glue of a vehicle. The method can be used to detect the state of glass glue of a front windshield of a vehicle or the state of glass glue of other glass on the vehicle.

[0052] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the vehicle glass glue state judgment method of the present application. Figure 1 As shown, the method for judging the state of the vehicle glass glue includes:

[0053] Step S101, determining the normal force on the glass of the vehicle relative to the ground when the vehicle passes through a bumpy road.

[0054] Step S102: determining the area of ​​the glass glue used to connect the vehicle body and the glass.

[0055] Step S103, calculating the tensile stress and shear stress of the glass glue when the vehicle passes through the bump strip according to the normal force, the area of ​​the glass glue and the inclination angle of the glass relative to the ground.

[0056] Step S104: determining whether the glass glue is torn according to the tensile stress and the shear stress.

[0057] It is worth noting that if Figure 2 The glass and body of the vehicle shown are in an assembled relationship, and the glass and body are connected by glass glue. For example, when the vehicle is undergoing a bump test, when the vehicle passes through a bump strip, the body is subjected to the upward impulse of the bump strip and is transferred to the glass glue. Since the buffer of the glass glue is not enough to resist the impact force on the body, the impact force on the body will be transferred to the glass through the glass glue. At this time, the glass has a tendency to be thrown outward and slide sideways relative to the body.

[0058] Take the glass of the front windshield of a vehicle as an example. When the vehicle drives onto a bumpy road, the front windshield has a downward lateral and normal displacement relative to the vehicle body. The glass glue is subjected to shear force and tension. In order to counteract this trend, the glass glue, as a medium connecting the vehicle body and the front windshield, is subjected to a normal tensile stress perpendicular to the front windshield. When the car drives off a speed bump, the glass has an upward lateral and normal displacement relative to the vehicle body. The glass glue is subjected to shear force and pressure. In order to counteract this trend, the glass glue, as a medium connecting the vehicle body and the front windshield, is subjected to a shear stress parallel to the glass. When the tensile stress or shear stress borne by the glass glue is greater than the limit stress of the glass glue, the glass glue will be at risk of tearing, which will cause the front windshield to leak. Therefore, this embodiment can effectively determine whether the glass glue is torn by calculating the tensile stress and shear stress of the glass glue.

[0059] The bump strip in this embodiment may be a speed bump strip used when a vehicle is subjected to a bump test.

[0060] In one embodiment, determining the normal force applied to the glass on the vehicle relative to the ground when the vehicle passes through a bumpy road includes steps S1011 to S1013.

[0061] Step S1011, determining the impact duration of the glass when the vehicle passes through the bump strip according to the vehicle speed when the vehicle passes through the bump strip and the length of the bump strip.

[0062] For example, the vehicle passes through the bump strip at a constant speed, and the time taken for the vehicle to move up and down the bump strip is symmetrical. The length of a single bump strip can be measured in advance, and the speed of the vehicle when passing through the bump strip can be obtained through a speed sensor, according to the formula:

[0063]

[0064] The length of time the glass is impacted when the vehicle passes through the bump strip is calculated, where L is the length of the bump strip, v is the vehicle speed, and Δt is the length of time the glass is impacted.

[0065] Step S1012: determining the upward normal velocity of the vehicle relative to the ground when the vehicle passes through the bump strip according to the maximum height difference of the vehicle body and the impact duration of the glass when the vehicle passes through the bump strip.

[0066] For example, when a vehicle passes through a bump strip, the height of the vehicle body is offset upwards compared to when it is driving on flat ground, and the direction of the vehicle's speed will change, with an angle of Δα with the original speed. At this time, the vehicle has an upward normal speed relative to the ground. According to the maximum height difference of the vehicle body when the vehicle passes through the bump strip and the impact duration of the glass, the formula is:

[0067] Δh / Δt=Δv n

[0068] The upward normal velocity of the vehicle relative to the ground when passing through the bump strip is calculated, where Δh is the maximum height difference of the vehicle body, Δt is the impact duration of the glass, and Δvn is the normal velocity.

[0069] It is worth noting that in order to obtain the normal speed of the vehicle passing through the bump strip, it is necessary to measure the maximum height of the vehicle body during the process of passing through the bump strip. However, it is difficult to measure the maximum height of the vehicle body during the dynamic driving of the vehicle. In this embodiment, a dynamic photo of the vehicle passing through the bump strip is taken by a flash screen camera, and based on the scale of the vehicle in the photo and the actual vehicle, the height of the vehicle in reality is determined according to the height of the vehicle in the photo, thereby calculating the maximum height difference of the vehicle body when passing through the bump strip.

[0070] Step S1013: determining the normal force on the glass upward relative to the ground according to the mass of the vehicle, the normal velocity and the duration of the impact on the glass.

[0071] At this time, the vehicle is an inertial reference system relative to the ground and is in a low-speed motion state, which conforms to the momentum principle of Newtonian mechanics. Therefore, the normal force on the glass can be calculated based on the initial and final states of the vehicle passing through the bumpy belt.

[0072] According to the glass impact duration, normal velocity, and vehicle mass, the formula is:

[0073] FΔt=MΔv n

[0074] The normal force on the glass relative to the ground is calculated, where F is the normal force, Δt is the impact time of the glass, M is the mass of the vehicle, and Δv n is the normal velocity.

[0075] In one embodiment, determining the area of ​​glass glue used to connect the vehicle body and the glass includes:

[0076] The contact area between the glass glue and the vehicle body is obtained according to the product of the bonding width and the bonding length of the glass glue; the lateral area of ​​the glass glue perpendicular to the vehicle body is obtained according to the product of the coating width and the bonding length of the glass glue.

[0077] For example, after the front windshield is assembled with the vehicle body, the positive contact area between the glass glue and the front windshield changes. Figure 3 As shown, according to the characteristic that the volume of the glass glue does not change, combined with the glue width D, bonding thickness h, bonding width d and bonding length l, the contact area between the glass glue and the car body when the front windshield is installed on the car body can be calculated:

[0078] S1=d*l

[0079] Among them, S1 is the contact area between the glass glue and the car body, d is the bonding width of the glass glue, and l is the bonding length of the glass glue.

[0080] Calculate the lateral area of ​​the glass glue perpendicular to the car body, the formula is:

[0081] S2=h*l

[0082] Among them, S2 is the lateral area of ​​the glass glue perpendicular to the car body, h is the bonding thickness of the glass glue, and l is the bonding length of the glass glue.

[0083] In one embodiment, calculating the tensile stress of the glass glue when the vehicle passes through the bump strip according to the normal force, the area of ​​the glass glue and the inclination angle of the glass relative to the ground includes:

[0084] F*cosα / S1=σ

[0085] The tensile stress is obtained by calculation, wherein F is the normal force on the glass, α is the inclination angle of the glass relative to the ground, S1 is the contact area between the glass glue and the vehicle body, and σ is the tensile stress.

[0086] Further, according to the normal force, the area of ​​the glass glue and the inclination angle of the glass relative to the ground, calculating the shear stress of the glass glue when the vehicle passes through the bump strip includes:

[0087] F*sinα / S2=τ

[0088] The shear stress is obtained by calculation, wherein F is the normal force of the glass, α is the inclination angle of the glass relative to the ground, S2 is the lateral area of ​​the glass glue perpendicular to the vehicle body, and τ is the shear stress.

[0089] In some optional embodiments, the above formulas for calculating tensile stress and shear stress can be summarized, and the tensile stress and shear stress of the glass glue can be directly calculated based on the vehicle speed extracted when the vehicle passes through the bump strip, the maximum height difference of the vehicle body, the length of the bump strip, the mass of the vehicle, the inclination angle of the glass on the vehicle relative to the ground, the bonding width of the glass glue, the bonding length of the glass glue, and the bonding thickness of the glass glue:

[0090] σ=4Mv 2 Δh(sinα) / dlL

[0091] τ=4Mv 2 Δh(cosα) / hlL

[0092] Among them, M is the mass of the vehicle, v is the vehicle speed, Δh is the maximum height difference of the vehicle body, α is the inclination angle of the glass relative to the ground, d is the bonding width of the glass glue, I is the bonding length of the glass glue, h is the bonding thickness of the glass glue, L is the length of the bump strip, σ is the tensile stress, and τ is the shear stress.

[0093] In one embodiment, determining whether the glass glue is torn based on the tensile stress and the shear stress includes: judging whether the tensile stress is less than a preset tensile stress threshold, and whether the shear stress is less than a preset shear stress threshold; if so, determining that the glass glue is not torn, otherwise, determining that the glass glue is torn. The tensile stress threshold σmax and the shear stress threshold τmax in this embodiment can be set based on experimental results or experience. When α<σmax, and τ<τmax, it is determined that the glass glue is not torn, otherwise, it is determined that the glass glue is torn when other results are met.

[0094] In one embodiment, the method for judging the state of vehicle glass glue further includes: establishing a vehicle dynamics simulation model, and setting kinematic pairs between various components of the vehicle in the vehicle dynamics simulation model; using the driving torque of the vehicle as an input variable and the tensile stress and shear stress of the glass glue as state quantities, solving the tensile stress and shear stress of the glass glue when the vehicle passes through a bumpy belt; and determining whether the glass glue is torn based on the tensile stress and the shear stress.

[0095] For example, the multi-body dynamics software Adams can be used to establish a vehicle dynamics simulation model, set the wheel angular velocity, angle and other kinematic pairs, add the vehicle's driving torque as an input variable, and the tensile stress σ and shear stress τ of the glass glue as state variables. Combined with the Simulink solver in the data analysis software Matlab, the stress change trend of the vehicle driving on and off the bump strip is calculated. The tensile stress change trend is as follows: Figure 4 As shown in Figure 2, the shear stress variation trend is as follows: Figure 5 shown.

[0096] Taking the bump strip on a car as an example, the positive direction of the X axis is along the tangent of the glass, and the positive direction of the Y axis is perpendicular to the glass. The force direction diagram is as follows: Figure 6 As shown. When the vehicle is on the bump strip, the glass tends to move downward relative to the vehicle body, and the glass glue is subjected to positive shear force in the X-axis; at the same time, it tends to move inward relative to the vehicle body, and the glass glue is squeezed and subjected to negative tensile stress in the Y-axis. Later, due to the collision, the glass tends to move negatively in the Y-axis relative to the vehicle body, and the glass glue is subjected to positive tensile stress in the Y-axis. When the vehicle is on the bump strip, the glass tends to move downward relative to the vehicle body, and the glass glue is subjected to positive shear force in the X-axis; at the same time, it tends to move inward relative to the vehicle body, and the glass glue is squeezed and subjected to negative tensile stress in the Y-axis.

[0097] After calculating the tensile stress change trend and the shear stress change trend through MATLAB, the maximum tensile stress and the maximum shear stress in the process of the vehicle passing through the bump strip can be found in the tensile stress change trend and the shear stress change trend, and when the maximum tensile stress is less than the tensile stress threshold and the maximum shear stress is less than the shear stress threshold, it is determined that the glass glue is not torn, otherwise it is determined that the glass glue is torn.

[0098] It is worth noting that the embodiment of the present application provides a method of calculating the tensile stress and shear stress of the glass glue through a formula and a method of establishing a vehicle dynamics simulation model through Adams and solving it through matlab to obtain the tensile stress and shear stress of the glass glue. In order to verify the reliability of the stress results calculated through the formula, the changes in the tensile stress σ and shear stress τ of the glass glue when the car passes through the bump strip are intuitively displayed, and the experimental data collected on site are used as simulation input. The calculation is performed according to the simulation model of Adams and matlab, and the shear force and tensile stress values ​​of the windshield when the car passes through the bump strip are output. Combined with the calculation results of the formula model, the feasibility and accuracy of the calculation process are jointly supported, which can effectively improve the effectiveness and applicability of the verification calculation process.

[0099] In a specific embodiment, a stroboscopic camera used to collect the maximum height of the vehicle body when passing through a bump strip can be added with an intelligent recognition and calculation system, and the parameters of the glass glue coating robot can be communicated with each other to judge the physical state of the glass glue by observing the driving posture of the car. When the risk of glass glue tearing occurs, a process optimization plan can be provided according to the on-site status, and the coating parameters and trajectory can be automatically adjusted to achieve self-identification and self-control of risks.

[0100] The method for judging the state of glass glue for vehicles provided in the embodiment of the present application has the beneficial effect that by checking the physical state of glass glue by this method, the risk of water leakage can be discovered in advance, the time for vehicles to be offline can be reduced, the cost of rework can be reduced, and the quality of the whole vehicle can be improved. The adaptability of glass glue to the general assembly production environment can be judged in advance. This calculation method can judge the adaptability of glass glue to the general assembly production environment in advance, and reduce the verification cycle of the introduction of new glass glue used by the vehicle manufacturer.

[0101] In a second aspect, an embodiment of the present application also provides a device for determining the state of vehicle glass glue.

[0102] In one embodiment, referring to Figure 7 , Figure 7 This is a functional module diagram of an embodiment of a vehicle glass glue state judgment device of the present application. Figure 7 As shown, the vehicle glass glue state judgment device includes:

[0103] A first determination module, which is used to determine the normal force on the glass of the vehicle in the upward direction relative to the ground when the vehicle passes through a bump strip;

[0104] A second determination module, which is used to determine the area of ​​glass glue used to connect the vehicle body and the glass;

[0105] A calculation module, which is used to calculate the tensile stress and shear stress of the glass glue when the vehicle passes through the bump strip according to the normal force, the area of ​​the glass glue and the inclination angle of the glass relative to the ground;

[0106] The third determination module is used to determine whether the glass glue is torn according to the tensile stress and the shear stress.

[0107] Furthermore, in one embodiment, the first determining module is further configured to:

[0108] Determine the duration of impact on the glass when the vehicle passes through the bump strip according to the vehicle speed when the vehicle passes through the bump strip and the length of the bump strip;

[0109] Determine the normal speed of the vehicle relative to the ground when passing through the bump strip according to the maximum height difference of the vehicle body and the impact duration of the glass when the vehicle passes through the bump strip;

[0110] The normal force on the glass upward relative to the ground is determined according to the mass of the vehicle, the normal speed and the duration of the impact on the glass.

[0111] Furthermore, in one embodiment, the second determining module is further configured to:

[0112] Obtaining a contact area between the glass glue and the vehicle body according to the product of the bonding width and the bonding length of the glass glue;

[0113] The lateral area of ​​the glass glue perpendicular to the vehicle body is obtained according to the product of the coating width and the bonding length of the glass glue.

[0114] Furthermore, in one embodiment, the calculation module is further configured to:

[0115] F*cosα / S1=σ

[0116] The tensile stress is obtained by calculation, wherein F is the normal force on the glass, α is the inclination angle of the glass relative to the ground, S1 is the contact area between the glass glue and the vehicle body, and σ is the tensile stress.

[0117] Furthermore, in one embodiment, the calculation module is further configured to:

[0118] F*sinα / S2=τ

[0119] The shear stress is obtained by calculation, wherein F is the normal force of the glass, α is the inclination angle of the glass relative to the ground, S2 is the lateral area of ​​the glass glue perpendicular to the vehicle body, and τ is the shear stress.

[0120] Furthermore, in one embodiment, the third determining module is further configured to:

[0121] Determining whether the tensile stress is less than a preset tensile stress threshold, and whether the shear stress is less than a preset shear stress threshold;

[0122] If so, it is determined that the glass glue is not torn; otherwise, it is determined that the glass glue is torn.

[0123] Furthermore, in one embodiment, the device further comprises:

[0124] An establishing module, which is used to establish a vehicle dynamics simulation model and set kinematic pairs between various components of the vehicle in the vehicle dynamics simulation model;

[0125] The solution module is used to use the driving torque of the vehicle as an input variable and the tensile stress and shear stress of the glass glue as state quantities to solve the tensile stress and shear stress of the glass glue when the vehicle passes through a bump strip.

[0126] Among them, the functional implementation of each module in the above-mentioned vehicle glass glue state judgment device corresponds to each step in the above-mentioned vehicle glass glue state judgment method embodiment, and its functions and implementation processes are no longer repeated here one by one.

[0127] In a third aspect, an embodiment of the present application provides a device for determining the state of vehicle glass glue. The device for determining the state of vehicle glass glue may be a personal computer (PC), a laptop computer, a server, or other device having a data processing function.

[0128] Reference Figure 8 , Figure 8 Schematic diagram of the hardware structure of the vehicle glass glue state judgment device involved in the embodiment of the present application. In the embodiment of the present application, the vehicle glass glue state judgment device may include a processor, a memory, a communication interface and a communication bus.

[0129] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0130] The communication interface includes an input / output (I / O) interface, a physical interface, and a logical interface, etc., which are used to interconnect the devices inside the vehicle glass glue state judgment device, and an interface used to interconnect the vehicle glass glue state judgment device with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display, a keyboard, etc.

[0131] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0132] The processor may be a general-purpose processor, which may call the vehicle glass glue state judgment program stored in the memory and execute the vehicle glass glue state judgment method provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the vehicle glass glue state judgment program is called may refer to the various embodiments of the vehicle glass glue state judgment method of the present application, which will not be described in detail here.

[0133] Those skilled in the art will understand that Figure 8 The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0134] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0135] The computer-readable storage medium of the present application stores a vehicle glass glue state judgment program, wherein when the vehicle glass glue state judgment program is executed by a processor, the steps of the vehicle glass glue state judgment method as described above are implemented.

[0136] Among them, the method implemented when the vehicle glass glue state judgment program is executed can refer to the various embodiments of the vehicle glass glue state judgment method of the present application, and will not be repeated here.

[0137] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0138] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0139] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0140] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0141] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0142] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0143] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for judging the state of vehicle glass glue, characterized in that: The vehicle glass glue state judgment method comprises: Determine the normal force on the glass of the vehicle in an upward direction relative to the ground when the vehicle passes over a bump strip; Determining the area of ​​glass glue used to connect the vehicle body and the glass; Calculating the tensile stress and shear stress of the glass glue when the vehicle passes through the bump strip according to the normal force, the area of ​​the glass glue and the inclination angle of the glass relative to the ground; Whether the glass glue is torn is determined according to the tensile stress and the shear stress.

2. The vehicle glass glue state judgment method according to claim 1, characterized in that: Determining the normal force on the glass of the vehicle relative to the ground when the vehicle passes through the bump strip includes: Determine the duration of impact on the glass when the vehicle passes through the bump strip according to the vehicle speed when the vehicle passes through the bump strip and the length of the bump strip; Determine the normal speed of the vehicle relative to the ground when passing through the bump strip according to the maximum height difference of the vehicle body and the impact duration of the glass when the vehicle passes through the bump strip; The normal force on the glass upward relative to the ground is determined according to the mass of the vehicle, the normal speed and the duration of the impact on the glass.

3. The vehicle glass glue state judgment method according to claim 1, characterized in that: Determine the area of ​​glass glue used to connect the car body and the glass, including: Obtaining a contact area between the glass glue and the vehicle body according to the product of the bonding width and the bonding length of the glass glue; The lateral area of ​​the glass glue perpendicular to the vehicle body is obtained according to the product of the coating width and the bonding length of the glass glue.

4. The method for judging the state of vehicle glass glue according to claim 3, characterized in that: Calculate the tensile stress of the glass glue when the vehicle passes through the bump strip according to the normal force, the area of ​​the glass glue and the inclination angle of the glass relative to the ground Including, through: F*cosα / S1=σ The tensile stress is obtained by calculation, wherein F is the normal force on the glass, α is the inclination angle of the glass relative to the ground, S1 is the contact area between the glass glue and the vehicle body, and σ is the tensile stress.

5. The vehicle glass glue state judgment method according to claim 3, characterized in that: Calculating the shear stress of the glass glue when the vehicle passes through the bump strip according to the normal force, the area of ​​the glass glue, and the inclination angle of the glass relative to the ground includes: F*sinα / S2=τ The shear stress is obtained by calculation, wherein F is the normal force of the glass, α is the inclination angle of the glass relative to the ground, S2 is the lateral area of ​​the glass glue perpendicular to the vehicle body, and τ is the shear stress.

6. The vehicle glass glue state judgment method according to claim 1, characterized in that: Determining whether the glass glue is torn according to the tensile stress and the shear stress includes: Determining whether the tensile stress is less than a preset tensile stress threshold, and whether the shear stress is less than a preset shear stress threshold; If so, it is determined that the glass glue is not torn; otherwise, it is determined that the glass glue is torn.

7. The vehicle glass glue state judgment method according to claim 1, characterized in that: It is characterized in that The method further includes: Establishing a vehicle dynamics simulation model, and setting kinematic pairs between various components of the vehicle in the vehicle dynamics simulation model; The driving torque of the vehicle is used as an input variable, and the tensile stress and shear stress of the glass glue are used as state quantities to solve the tensile stress and shear stress of the glass glue when the vehicle passes through a bump strip.

8. A vehicle glass glue state judgment device, characterized in that: The vehicle glass glue state judgment device comprises: A first determination module, which is used to determine the normal force on the glass of the vehicle in the upward direction relative to the ground when the vehicle passes through a bump strip; A second determination module, which is used to determine the area of ​​glass glue used to connect the vehicle body and the glass; A calculation module, which is used to calculate the tensile stress and shear stress of the glass glue when the vehicle passes through the bump strip according to the normal force, the area of ​​the glass glue and the inclination angle of the glass relative to the ground; The third determination module is used to determine whether the glass glue is torn according to the tensile stress and the shear stress.

9. A vehicle glass glue state judgment device, characterized in that: The vehicle glass glue state judgment device includes a processor, a memory, and a vehicle glass glue state judgment program stored in the memory and executable by the processor, wherein when the vehicle glass glue state judgment program is executed by the processor, the steps of the vehicle glass glue state judgment method as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a vehicle glass glue state judgment program, wherein when the vehicle glass glue state judgment program is executed by the processor, the steps of the vehicle glass glue state judgment method according to any one of claims 1 to 7 are implemented.

Images