Geely Automobile Safety Technology Raiders
Speaking of Euro NCAP, this is currently the most influential safety assessment agency in the international automobile industry and one of the most authoritative evaluations recognized by the majority of automobile manufacturers and consumers, especially its independent operating model, open and fair classification standards As well as the rigorous and scientific testing method, it is notoriously "strict". According to Zhao Fuquan, vice president of Geely Group, Euro NCAP test content includes frontal collision, side collision, column side collision and rear impact collision. The evaluation indicators are divided into four categories: adult protection, child protection, pedestrian protection and safety assistance. , A total of more than 30 small items, involving nearly 1,000 test data. In order to obtain a certain star in the evaluation, in addition to the achievement of each major category, the total weighted score must also meet the requirements of the corresponding star, that is, each item should be good, and cannot be "partial". This will increasingly test the hard power of various car manufacturers. If you want to get a high star rating, every link should not be ignored. If it is expressed in one word, it is "difficult"!
The Geely R & D team relies on solid hard work. According to Zhao Fuquan, Geely's engineers have done a lot of detailed development work to make EC7 meet European design standards. The car not only has good active and passive safety performance, but also meets a series of very difficult European environmental requirements such as European V emission standards and material recycling regulations. As far as safety development is concerned, Geely has invested a lot of manpower and material resources in design and development, CAE simulation and test verification. A total of more than 200 R & D personnel participated in the safety development of EC7, and has conducted more than 100 vehicle crash tests, 180 More than three sliding table tests, hundreds of parts verification tests and a lot of simulation analysis are the culmination of Geely's R & D team after more than three years of hard work. The following is an analysis of the various test results and technical connotation of the Emgrand EC7:
1. Adult protection
In terms of adult protection, EC7 fully considers the close relationship between the occupant space and surrounding contact parts. Through multi-round optimization of the overall layout, comprehensive consideration is given to the comfort and ergonomics requirements of the occupant space ergonomic layout, and reasonable control and management of the occupant cabin layout space and interior design impact factors on occupant protection. Compared with the B-class models of the same class, the Geely Emgrand EC7 has more ample front occupant layout space. The distance from the occupant's chest to the center of the steering wheel is about 330mm, and the distance from the knee joint to the dashboard is about 175mm. It plays an extremely important role in protecting the occupants in frontal offset collisions.
The Emgrand EC7 model also has sufficient occupant layout space on the side. Through design optimization, it ensures that during the door intrusion process, the occupant's abdomen, hips and other hard-to-noise parts can fully absorb the collision energy, thereby effectively protecting the occupant's easy to lose points (For example, the ribs of the occupants), the overall score of the occupants in the side impact and side column impact tests has been improved. The design of the Dorsett EC7 door interior panel corresponding to the position of the occupant's abdomen and hips is relatively smooth. There are no excessive protrusions or depressions, there is enough hip contact area, and there are hip push blocks corresponding to the occupant's hips. In the process, the interior of the door has a good pushing effect on the hips of the occupants, which is beneficial to the protection of the occupants from side collisions. The interior armrest of the door does not interfere with the dummy ribs, which is beneficial to the protection of the dummy ribs. The shoulder of the dummy corresponds to the position of the waistline of the door interior. During the collision, the shoulder of the dummy first comes into contact with the interior of the door to absorb part of the collision energy while buffering the impact of the door intrusion on the ribs of the dummy.
At the same time, the Emgrand EC7 model fully applies the pre-tensioning force-limiting seat belt technology. Through the continuous optimization of the seat belt pre-tensioning force and the limit force value, and the perfect match with the airbag, it effectively reduces the injury of the occupant's chest during the collision. value. Considering that the Euro-NCAP evaluation procedure uses a 64km / h frontal offset collision test condition, the collision test speed is higher and the collision energy is larger. Therefore, the Emgrand EC7 model uses high-limit force-level seat belts, which fully avoids possible secondary contact between the occupant and the steering wheel, instrument panel and other restraint system components during the collision, and effectively protects the occupant through matching and optimization with the airbag.
It is particularly worth mentioning that the Geely Emgrand EC7 model's whiplash (rear impact whiplash injury) scored as high as 3.7 points, which was only 0.3 points away from the full score, which is also the highest score in the test so far in Euro NCAP history. According to Zhao Fuquan, vice president of Geely Group, when Geely learned that Euro NCAP added the Whipalsh test in 2009, it immediately organized a bottom-up test, but the score of the bottom-up test was zero. Because this technology is an emerging passive safety technology in China, Chinese independent brand car manufacturers simply do not have any technical reserves and test experience.
In order to meet safety requirements, Geely engineers also proposed cooperation intentions to foreign active headrest suppliers, but the other party's products are far higher than the price positioning of EC7. At that time, there was no supplier in China that could develop the technology. Even the internationally renowned company Johnson Controls did not have the technology in the country, and even dared not make a commitment to score 3 points. In the absence of investment, Geely engineers decided to conduct their own research. After repeated simulation analysis, original test data analysis and component test analysis, they finally found out the most important factors affecting whiplash protection. According to this, the partial design of the seat and the structure of the seat back are optimized, and then the details of each detailed size and structural strength are input to the supplier, and then after many rounds of repeated tests, finally created the history of Euro NCAP best result.
2. Child protection
In terms of child protection, not only should we consider how to protect children in an accident, but also have strict assessments on the convenience of child seat installation, vehicle description information and other Euro NCAP. It can be said that this is not only a technology, but also a small job. Especially in the dynamic development process, not only must the strength of the child seat be taken into consideration, but also the child ’s passive injury cannot be caused due to the excessive restraint of the child, which requires a lot of simulation and test verification.
And because the current child protection is not strict in domestic regulations, it makes the adaptation to the development of the European standard more burdensome and more challenging. A large number of technical details must be considered in the development. These details are even subtle to include the readability of the label-each label must have the language of the corresponding country, and so on. Therefore, child protection can be described as "although the dummy is small, the technical difficulty is not small." In the end, EC7 got 80% of the evaluation results in this item and performed well.
3. Pedestrian protection
In terms of pedestrian protection, Euro NCAP's requirements are also comprehensive and strict. Not only should we consider the safety of adult pedestrians after being hit, but also to pay attention to the situation of children pedestrians with low self-control ability being hit. And at this point, the Emgrand EC7 is equally unambiguous. A detailed analysis of the children's head collision results of the Emgrand EC7 can be found in the middle area of ​​the hood, the protection of the child's head is very good, each area has a full score, and the entire child's head collision has a high score of 8 points . This is because Geely's engineers have fully optimized the space layout of the EC7 engine compartment, and fully considered the key hard points (batteries, air filters, various liquid reservoirs, etc.) that may affect the head collision. These efforts ensure these hard points An effective energy-absorbing space is formed between the outer panel of the engine hood. As a result, the Emgrand EC7's head collision performance for children even surpasses the Japanese models that have been in a leading position in the field of pedestrian protection technology, such as Honda Civic and JAZZ.
In the calf collision test, the Emgrand EC7 scored 5.8 points, and achieved the best protection for pedestrian calves with a score close to full score (out of 6 points). Euro NCAP pedestrian protection calf impact is evaluated by three indicators, namely tibial acceleration, knee shear displacement, and knee bending angle. Each value of the above indicators needs to reach the Euro NCAP standard to obtain the corresponding score, so the difficulty of development can be imagined.
Geely's engineers realized the protection of the pedestrian's lower leg by adopting a special lower support structure for pedestrian protection and a front beam energy-absorbing plate structure. The application of the lower brace ensures that the knee bending angle of the pedestrian's calf is reduced to a minimum, and the front beam energy absorption plate can effectively absorb the impact energy during the calf collision, reduce the tibia acceleration and the knee shear displacement, and finally achieve the pedestrian Effective protection of the calf area.
4. Safety assistance
In terms of safety assistance, from the results of previous releases, Geely Emgrand EC7 has even reached the safety level of luxury cars. The performance of EC7 in the safety auxiliary item in Euro NCAP is only 1 point lower than the full score, which has reached the European 5-star standard, which shows that Geely Automobile has continuously made new breakthroughs in passive safety and is developing active safety technology. It also created a new benchmark for independent brands. This EC7 vehicle is equipped with auxiliary safety systems such as ESC (Electronic Stability Control), ASLD (vehicle safety speed limit control), SBR (occupant seat belt use reminder). Among the 14 models announced by Euro NCAP in this issue, as shown by the blue box in Figure 2, the Emgrand EC7 and Mercedes-Benz, Volkswagen and other cars have the highest score of 86%, compared with Jaguar XF, Jaguar XF, Jeep Grand Cherokee, MG6, etc. scored 71%, while Fiat Panda only got 43%. It is important to know that Euro NCAP's evaluation of safety auxiliary items is also very strict. Not only does it require a corresponding configuration, but this configuration must be tested and proven to meet European standards and be effective.
5. Subjective evaluation
In addition to the quantifiable evaluations mentioned above, Euro NCAP also has very rigorous subjective evaluations. These subjective evaluations often require very experienced engineers to grasp, which is another great challenge for a young team like Geely, and a challenge that has never been experienced before. Whether there are tears in the floor, whether the brightness of the indicator light reaches the visually acceptable range, whether the alarm sound is sufficiently loud, etc., these must be tested under the "microscope" of subjective evaluation! However, this is also the Euro The authority of NCAP is also due to this reason, which fully proves the authenticity of the Emgrand EC74 star.
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