Recently seen a very interesting video in a circle of friends, you must share with you.
The story is like this, this group of friends is probably the brakes are too fierce, and the mobile phone on the wireless charging board flew out along the tilted charging plate path. To the central control display, the screen is crushed directly.
The eyes recognize this is 蔚. So, the various sounds come with: Is the quality of the domestic car not really hammer? The screen is even broken, the product quality is not too much, and the human-computer project is tissue!
, regardless of the truth, one time, everyone will not pay attention to “collision safety” needs to be considered.
The anti-collision requirements of the interior assembly
The interior is a collective, you can put the car compartment All partitions, door-to-door decorative panels, dashboard assemblies, handrails, carpets and other parts and materials are all understood as automotive interiors. The central control display mentioned in the beginning is part of the dashboard assembly, and naturally it can also be defined as an interior.
Dashboard “Explosive Chart”, the dashboard assembly is the most complex interior piece on the car
Everyone may ask, the interior parts are mainly wear-resistant, dirty, not easy to fade, how can you have a collision? In special cases, in addition to the accidental events in the beginning of the video, a car company to do the door panel speaker cover, the shock test has also occurred.
What is “falling ball impact test”?
As the name suggests, it is to use a certain quality steel ball to fall from a certain high degree of freedom of the sample surface to assess whether the sample will deform, rupture, and so on.
The interior parts are more fragile, slammingIt is not a inferior product that causes rupture. Therefore, impact energy should have one degree, which can simulate some daily use scenarios. More than this range can also prevent the collision, you can understand it.
The plastic member has a low temperature brittle, and the falling ball impact test has a low temperature test (-30 ° C) in addition to the normal temperature test.
The impact energy of the general interior member is required in the range of 1J to 3J. Taking the standard of a mid-reservoir as an example, the steel falling ball mass is 500g, the fall ball is 50mm, and the height of the falling ball is 400mm. We know impact energy: E = MGH. This is called 1.96J for this conversion. Usually, it is not possible to change significantly after the impact is required, and it is broken.
M is the mass of the steel ball, the unit kg; h is the distance from the bottom of the steel ball, unit m; G is Gravity acceleration 9.8m / s2; E is impact energy, unit is J.
Next, enter the physical link, we are estimated how much the impact energy of this mobile phone in the video is estimated. The video of Huawei’s mobile phone is a metal material, and there is similar to the shock test.
According to the weight of 200 g, Ideally impact energy: 1 / 2mIDDOT; mmIDDOT; V2, V is speed. We press 2J energy, and the speed of the mobile phone impact screen has 4.5m / s. If it is 3J, the speed is 5.48m / s.
Video screenshot
Due to the limited physical level, there are too many factors. At this point, we can only determine according to life experience, and the speed of 4 ~ 6m / s is likely. At the high speed, it is very close to the screen and the wireless charging plate that is designed to be designed. The gravity potential can be lost, the stall should be not serious, so there is stillCan achieve this speed. That is, the impact energy is in the range of critical point, if the speed is too high, the brake is anxious, and it seems that the critical range is normal. This seems to be accepted.
And unfortunately, in the automotive industry, the display of the shock of the display is not common. This test is now mainly targeted for automotive inside and external components made of organic materials such as panels, films, liner, column decorative panels, anti-rubber plates, and the like. 
You may say that the mobile phone is a drop shock test, which can be used as a car screen. However, the energy of mobile phones is relatively low, calculated from 0.147J, which is obviously not enough in this level.
This seems that although most of the standards of the vehicle machine is more stringent, the integrated actual use scenario, Some tests may not do it.
In addition to the falling ball impact test, “Point rigidity test” often needs to be done in the interior, and the purpose is to assess the deformation of the interior parts, and the requirements will not cause obvious Permanent deformation.
If the display is 歪, can you accept? Therefore, the display will make a point rigidity test.
Taking a corporate standard as an example, the detection condition is to slow smoothly and smoothly applying the edge of the display. Under this pushing force, the display screen score is required to be less than 10 mm and can be restored to the initial position after canceling the external force. 
200N is converted to the weight of 20 kg, which is not light. However, this standard is only for assessment of the edge of the screen, and the strength is probably a little dear. And we know that the impact and slow load are completely two yards. When it is slowly loaded, it is not easy to cause the stress concentration, and there is a time to unload.
Comprehensive discussion speculation This situation is placed on other cars and the result is the same.
The onboard screen is inevitably trend
medium control screen It is also understood that it is fixed, after all, it is fixed at one place, and is more in a place where the position is high and deviated from people, unlike the door panel, the dashboard is easily impact by foreign matter. According to the general main sub-dashboard design, there will be no such “ballistic”.
But whether this also warned the engineer, to fully consider the actual use when testing is verified?
Designer’s idea is good, beveled design more convenient driver Operating a mobile phone in driving, don’t look at 15 degree look, relying on the feeling of the central armrests.
And now there are more large-sized full screens on the car, such as Roewe Marvel X’s 14-inch tilt in the Tilting screen, which is hit, similar design There is a new generation of Mercedes-Benz S-Class, Tesla Model S.
Roewe MARVEL X car main Note that in driving, don’t put your phone in central armrests, this angle has the risk of crushing the screen. Model S’s glove box is more relying on Roewe Marvel X, but also pay attention. 
exceptLike Audi E-TRON concept, the display is also designed to the inside of the door.
Honda Urban EV Concept The screen size is also greater, and the control is the content you need to focus on. In short, these design is the development trend, and now the screen is broken, it can be understood, and it is not good to say in the future.
The car display is diversified, and the layout for the front view is not tidal, and the display of the display on both sides is one of the trends. .
Yason Sociation
Automotive designer and The engineer loves to kill without fake, some cool design is very beautiful on the drawing, but it is really produced, but it is difficult for the engineer. For the display, there will definitely have more, larger pieces of display in the future, how to ensure that it’s normal use is good.
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