Article original: Nice good car
Original link: https://mp.weixin.qq.com/s/n79tfhApUGTeEkxshW0b-A
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If you ask a real old driver, what is the difference between the BBA that Chinese worship and the domestic car? The answer will most likely be: the noise in the car is very different. Indeed, in the early stage of China's automotive industry, the NVH silent advantage accumulated by BBA's century-old manufacturing is definitely one of the biggest contributors to the achievement of Ashkenazi quality reputation.
Even ten years later, you'll find that the BBA is still performing a high-profile "journey of tranquility", but what is different today is that quiet comfort is no longer an exclusive term exclusive to high-end luxury cars.
In the ten years since The Chinese auto industry pressed the fast-forward button, many independent brands' pursuit of NVH can be said to be from "data alignment" to "experience alignment", and even great strides beyond. What most alarms the joint venture vehicles is that there are autonomous vehicles that dare to expand the technology to the compact product series, and this practice of not sparing costs has undoubtedly put pressure on the same level of joint ventures.
For ordinary consumers, at this time, they must ask: Who is the best person? Then, Chang'an Auchan must be named. Take the product positioning of the new car Auchan X7PLUS, which has just been launched, which is the best model for creating a quiet and comfortable sense of NVH. With the price of 100,000 levels, to create a sense of comfort for 300,000 classes of models, familiar with the automobile manufacturing industry knows that the bottom line is a little insufficient, Auchan Automobile does not dare to play such a way of playing.
Why do we do the best NVH in the 100,000 compact class?
This is an era of escalating "car life" weights.
The Chinese concept of consumption has bid farewell to the superficial era of "closing the door and listening to the sound" and the academic era of pondering parameter comparison, and has become more mature and pragmatic - the car is for people. A truly good car should be able to fulfill and fulfill a person's ideal life.
The "new backbone" of thirty years has long been aware of this. The high rhythm of life makes them pursue more time and space for balancing family, career, and self. In their minds, the account is calculated like this: choosing a car that is comfortable enough is equivalent to 2 hours more per day "Concall time, parent-child time, couple time"...
But it is precisely in the compact SUV market that is most favored by the "new backbone", too many manufacturers will "equate" comfort quality with intelligence and start hand-to-hand combat. And deliberately ignore: when the NVH mute of an SUV is not ideal, any conversation, entertainment, and interconnection can not talk about pleasure, only the difficult chicken ribs.
Such neglect is not a mistake in the product positioning of manufacturers, but it is indeed limited by the level of technology and cost. Compared with the increase of intelligent equipment, the optimization of NVH mute requires a lot of R&D investment and time cost, which is too difficult a decision for the compact level.
300,000 levels of quiet experience, Auchan X7 PLUS's NVH is not "metaphysics"
How "hard" is NVH? This can be seen in the automotive engineer's mantra: NVH is a metaphysics.
In essence, this is a discipline that is fully opposed to the principles of automobile power and mechanics. Because when a car starts to drive, the tires, the glass, the assembly, the drivetrain... Noise is generated everywhere by friction and work, and what NVH engineers are doing is to eliminate these sounds before they reach the ears of the occupants.
Therefore, when engineers optimize NVH, they usually start from two aspects: one is from the source of vibration and noise, and the other is from the transmission channel of vibration and noise.
In terms of the former's "invisible details", auchan X7PLUS is "not to let go of a point of improvement". In the most noisy car body, this car uses 17 acoustic damping materials to comprehensively block noise such as tire friction and uneven ground. The 26 places of the whole car adopt space-grade sound-absorbing cotton to achieve all-round stereoscopic wrapping, fully isolate the tire noise and wind noise during the driving process, and create a more advanced atmosphere in the car. This includes a number of "out-of-the-loop operations", such as details such as the front wall acoustic mat, carpet and rear hub bag acoustic mat to achieve complete coverage of the sound insulation material. In addition, auchan X7PLUS also absorbs sound through the cavity of the 9 core parts, eliminating any possibility of cavity resonance noise in the engine compartment.
For the latter, Auchan X7PLUS adopts a strategy of "using the best sound-absorbing materials". For example, its front windshield and front doors are made of silent materials - 3.96mm polyester sunshade silent glass, with a 3-layer silent structure design. Compared with ordinary single-layer glass, it can effectively help isolate tire noise and wind noise, although this is often the standard used by 200,000-level joint venture vehicles. At the same time, in the dimensions that are more easily overlooked inside and outside the car, including side columns, instrument panels, air conditioning boxes... High-quality sound-absorbing materials can be used up.
In fact, auchan X7PLUS, the ultimate NVH solution for mass production vehicles, is improved layer by layer after 13 extreme road surfaces + 4 extreme environments + 5 cruel trials.
If you have observed the dismantling experiments of several joint venture cars in previous years, and seen the "riot operation" of those "cost reduction" and provincial engine compartment and door sound insulation cotton; then the sincerity behind the details of Auchan X7PLUS "space-level sound absorbing cotton" and "3.96mm soundproof glass" can be said to be self-evident.
Tracing back to the source, Changan Auchan's real strength in doing NVH is still "technical lizi"
Looking at the BBA's decades of singing in China, we will find that NVH is almost equal to "high sense".
Why? Because of the tranquility of NVH, it is not only relying on "checking for leaks and filling gaps", it absolutely gives full feedback to the quality strength of a manufacturer's automobile manufacturing. It is precisely that Changan Auchan and Changan Automobile share the same research and development system, and in recent years, their technical strength has gradually "overtaken", and there are a large number of eye-catching technical achievements from the powertrain to the chassis.
As far as Auchan X7PLUS is concerned, this car is equipped with a new generation of Blue Whale NE1.5T high-pressure direct injection engine, which is from the Blue Whale series that has won the "Heart of China" top ten honors for five consecutive years by Changan Automobile, and one of the biggest features of this series is high efficiency and high quality, which includes excellent performance in the field of tranquility. The engine integrates world-class NVH control technology, such as a silent chain from BorgWarner, a silent belt from Schaeffler, and a high-pressure fuel injection rail wrapped in soundproof materials, which effectively reduces the resonance, knocking and roaring phenomenon of the entire drivetrain.
On the other hand, Auchan X7PLUS has put a lot of effort into the chassis of the vehicle. For example, the flexible subframe structure and integrated shock absorbers are more durable than ordinary rubber bushings, while the weight transfer when steering is more direct, effectively improving the shock absorption effect, which will be directly fed back on the NVH mute effect.
The overall leap in technological strength is not only a soft level, but also a hard level. The NVH laboratory of the global R&D center built by Changan Automobile has built NVH laboratories such as a two-wheel drive drum anechoic laboratory, a vehicle abnormal sound test room, and a full silencer room for sound insulation measurement, and these "hard goods" even if they pull mainstream joint venture manufacturers out for a walk, they must be impressed.
For example, a paranormal test environment of no more than 25dB(A), a suspended room isolated from external vibrations, an electronic shaker that allows the abnormal sound to "jump out", an acoustic camera that "takes pictures" of noise... Many advanced environments and equipment can ensure that users have the ultimate comfortable car experience in the objective experimental dimension.
Write at the end
Looking at the impetuous car market, even 200,000-level home SUVs may not be able to sink their hearts to drill through the tranquility of NVH. Objectively speaking, in terms of NVH mute alone, Auchan X7PLUS is definitely an out-of-the-box "out of the loop". Behind the "100,000-level price, 300,000+ level enjoyment", it is not only the overtaking of technical strength, but also the determination of Changan Auchan to "take the user as the leader" and create "double value" for the user.