Compared with power and interior, the safety performance of automobiles, especially passive safety performance, is generally not easy to be perceived. However, car safety is a top priority, so many car companies participate in crash tests by authoritative institutions or conduct static compression tests to win the trust of the market and consumers with test results.
In recent years, the industry has gradually paid attention to rollover accidents with high injury and fatality rates, and institutions such as the China Automotive Center have also opened tumbling test projects. Laboratory testing has its advantages and necessity, but it is still difficult to simulate the rigors of an uncontrollable real rollover accident. Which car dares to challenge the live tumbling challenge?
Recently, the author learned from the official Xingtu that the new generation of moon Lan will challenge the first slope top tumbling test in China, and the test conditions are extremely harsh: vertical height of 25 meters, 45° steep slope, nearly 50 meters long slope!
Rolling down from the top of the slope, what tests will the moon face?
If you talk about the lab version of the rollover challenge, you can set the starting speed, roll angle, and simulate the vehicle's performance in high-speed rollover, rollover, or even spiral rollover scenarios. Then, the 2023 TOP Safety slope top tumbling test that is about to be challenged by the new generation of moon is an uncontrollable "free" roll test, in the process of rolling straight down from the top of the slope, the moon will experience a free roll with a height difference of 25 meters, and the strong gravitational potential energy is converted into kinetic energy of collision, which will produce unpredictable impacts on the side, top, bottom and front of the vehicle. In addition, rolling on a steep 45° slope is highly likely to bounce, further complicating the challenge.
What is the confidence that allows the new generation of Lunar "Hao" to face the debuff-filled tumbling test unambiguously? We combined the main points of the slope top roll test to analyze the safety strength of this car one by one.
Based on the personal safety of the occupants, the first thing to be examined in the rollover test is the vehicle's restraint system. It is crucial that the new generation of Lunar can tighten the seat belt and explode the 10 airbags of the whole vehicle in time after the rollover begins and the collision energy is transmitted to the human body within tens of milliseconds. The new generation is equipped with pre-tensioned seat belts that sense impact and vehicle dynamics, tighten and firmly attach the occupants to the seats at the first time, reducing the risk of occupants rushing forward or coming into contact with other structures in the car.
At the same time, 10 airbags detonate in time, providing all-round and thoughtful protection for the occupants during continuous rollover. Among them, the 2602mm ultra-long air curtain covers the passengers of the whole vehicle, and the only front intermediate airbag in its class, which effectively reduces the contact and collision damage between the occupants; Side airbags in both the first and second rows will also dampen side impacts. It is worth mentioning that the configuration of this car's 10 airbags is not only unique in its class, but also rare in luxury cars with hundreds of thousands. This is one of its strengths to dare to meet the challenge of the slope top.
Secondly, the tumbling test tests the structural robustness of the whole vehicle. The new generation of Lunar must ensure that after several turns of tumbling with high impact, the main load-bearing components such as the A pillar and the B pillar do not bend, the roof does not collapse, the door can be opened normally, the seat is not deformed or not broken, and the fuel tank is not leaked, so as to maximize the living space and escape time of the occupants.
What kind of "steel bone" can achieve the above effect? The high-strength steel of the new generation of moon vehicles accounts for up to 85%, covering the entire crew compartment and key stress-bearing parts; At the same time, the door anti-collision beam and B-pillar adopt ultra-high strength steel reinforced plate hot stamping technology (UHSSP), the tensile strength is 4-5 times that of ordinary steel, up to 1500MPa, equivalent to each square centimeter of the body, can bear about 15 tons of weight.
The roof compressive coefficient SWR (peak load to vehicle weight ratio) of this car is as high as 5.92, which can carry about 12 tons of weight (equivalent to a medium-sized empty truck), far exceeding the G-level standard of China Insurance Auto Safety Index C-AISI, bringing more "top" safety protection to the entire vehicle occupants.
The solid material is the foundation, and the unique cage body structure and multiple annular load transfer paths cooperate and complement each other to create a five-star safety fortress. In the research and development stage, the theoretical bearing capacity of each path is obtained through CAE optimization technology to achieve the best comprehensive performance under multiple working conditions, ensuring that in side collisions and tumbling collisions, the doors are intact and the body does not invade the passenger compartment, providing an indestructible living space for the occupants.
Strict research and development, five-star safety, Lanyue casting a safe and secure home
In fact, this test is not only uncontrollable, but also difficult to carry out human intervention in the test, more real, it is likely to appear "negative", affecting the brand image of Xingtu and the image of the moon product.
Therefore, the new generation of moon challenge the first 45° steep slope rolling test in China, and the whole network live broadcast test process, it is no exaggeration to say that "bold" is written on the face. You have to be quite confident in your own strength to dare to do this.
From its past achievements and R&D strength, we can explore the source of confidence. In terms of past achievements, Xingtu Lanyue has passed the "World's First Challenge Double Car 128 km Relative Speed Collision Test" with a near-full score, won the "2021 China Top Ten Body Award", and obtained the "Five-Star" safety rating of C-NCAP of China Automotive Center with a comprehensive score rate of 92.4%.
From the perspective of R&D standards, Xingtu Lanyue condenses Chery's more than 20 years of car-making efforts and essence, born in the earliest, largest and most complete crash safety laboratory of Chinese brand construction, and in the process of research and development, more than 1 million hours of calculation and simulation have been carried out, as many as 62 crash tests. According to the test results, we continue to optimize the frame, strengthen the key joints, strengthen the body structure, and finally create luxury quality that meets the international top safety standards of Euro NCAP, IIHS and FMVSS, creating a safer and more secure home for users.
Many models that are "test-taking" may perform well in frontal collisions and large-angle offset collisions in the laboratory, but they basically dare not carry out real-life tests of "real action". This time, the new generation of Lanyue participated in the China Automotive Center TOP Safety China's ultimate safety challenge, tumbling down a 45° steep slope with a height difference of 25 meters, which may reshape the safety benchmark in the field of medium and large SUVs. It is reported that this test will be carried out in mid-September, when the whole network will be broadcast live, and we will continue to pay attention.