In the past two years, the domestic automobile market can be basically summarized with "based on consumer demand". Especially for young consumers, their intention to buy a car is very clear, such as whether the product shape is sporty, whether the technology configuration is intelligent, whether there is a cooler "black technology" and whether the performance control is satisfactory, etc., which are the subjective decisive factors that affect whether they buy the product. However, few young consumers put the quiet comfort of the car at the top of the car purchase consideration.
For many urban people, in the bustling and noisy life, always want to find a quiet private space, but the company has a heavy and lengthy work, the family has a cut and messy chores, only on the way to and from work, sitting in the car is their own real private space. If the appearance of a car is meant to please the eye, then opening up its interior world is the essence of it.
With the intensification of the "inner volume" of the automobile circle, in the B-class sedan segment, the main models of major brands can be described as one against the sky, and the configuration is more than one to the top. However, whether each model is strong or weak, and whether the world in the car is quiet or not, it is necessary to pass a rigorous test before concluding.
As a national A-class event, the CCPC China Mass Production Vehicle Performance Competition is also known as the "Olympic Games" in the automotive industry. If you want to achieve excellent results here, you naturally put forward higher requirements for vehicles. Among them, Dongfeng Nissan Tianlai won the annual comprehensive championship of the medium and large car group in the fierce competition in 2021, with the dazzling performance of public stations and professional stations, becoming the only model to win the award consecutively. In addition, in the professional station CCPC sound insulation and noise reduction competition, Tianlai won the championship of the whole field, pressing against many luxury models such as Mercedes-Benz BMW.
It is worth mentioning that on April 16 this year, Dongfeng Nissan Tianlai also successfully passed the certification of China Automobile Yanhuacheng and obtained the "Quiet Star" certification certificate. It is understood that the certification standards and rigor are much higher than the national standards, and Tianlai is the first joint venture B-class sedan to pass in the certification project. So behind the dazzling performance, there are those "secrets" about silence?
Full-dimensional noise reduction for theater-level silence
Regarding the quietness of the vehicle, I believe that many people will immediately think of the "NVH" we often mention, in fact, the so-called "NVH" refers to noise, vibration and harshness (Noise, Vibration, Harshness). Statistics show that about 1/3 of vehicle failures are related to NVH, so the sound quality of vehicles is not only related to driving experience, but also an important comprehensive indicator to measure the level of automobile manufacturing.
However, among the tens of thousands of parts of the car, the design and application of almost every part will affect the NVH characteristics of the whole vehicle to a greater or lesser extent, and the noise and vibration may come from the tires, from the suspension, from the engine, and may even come from the interior panels inside the car. Although there are a large number of formula theorems and the blessing of professional equipment, some problems may not be able to find the cause at all, let alone be solved by willing to invest costs. Therefore, there is a common saying in the discipline of automotive engineering: the study of NVH performance can be called the most magical "metaphysics" in the field of vehicle engineering.
It is understood that the "Quiet Star" certification of China Automobile Research Institute is mainly aimed at the quiet performance of the whole vehicle, based on national standards, to build a more stringent and more dimensional evaluation system, through the laboratory to simulate the internal and external noise environment of the vehicle, comprehensively test the quiet level of the whole vehicle.
The certification focused on professional testing in semi-anechoic laboratories and mixing rooms to measure the vehicle noise reduction coefficient and sound source sensitivity index in key positions of the vehicle. In the measurement of vehicle sound insulation, Tianlai has achieved sound insulation results higher than the highest certification standard in the position where consumers feel most susceptible to noise interference such as the main and co-drivers; in the vehicle noise transfer function test, the sound source sensitivity index of the key noise parts such as the front cabin and exhaust pipe of Tianlai is above the highest level A standard of certification.
This is also the second time that Tianlai has won the honor of vehicle quiet performance category after winning the "King of Tranquility" in the 2021 China Mass Production Vehicle Performance Competition Sound Insulation and Noise Reduction Competition. It should be pointed out that Tianlai is also the first B-class joint venture sedan to receive this title.
So, what "fierce materials" did Tianlai put down to completely break through the "metaphysics" of NVH?
The study found that the long-term noise in the acceptable environment of normal people is about 50 decibels. In daily life, if the sound is unevenly distributed in frequency, it will make people feel stimulated, which is what we often call "harsh". As for "harshness", we generally measure it in terms of sharpness. The higher the sharpness, the more concentrated the sound is in frequency, which is the mystery of frequency distribution.
For a simple example, the same 50-decibel sound, the "whirring" sound issued by the computer cooling fan, compared with the sharp high-frequency whistle generated by the friction in and out, it must be more acceptable to the former. In terms of noise reduction, cars and consumer electronics are similar.
The first is to block the transmission of sound. For example, laptops generally add foam next to the heat dissipation port to suppress noise inside the computer as much as possible. For cars, the main sources of noise are concentrated in the three aspects of engine, wind noise and tire noise. Therefore, car companies will also carry out additional sound insulation treatment on the roof, bottom of the car, and window.
Specifically, through the acoustic sound insulation glass of the three-layer extrusion technology, combined with the polymer PVB film sandwich, Tianlai can effectively prevent the door and window from leaking sound. Around the vehicle, the use of double suction sound insulation materials with excellent sound absorption performance, and for sheet metal parts that are prone to vibration, add damping pads to suppress vibration, which can maximize the barrier and absorb noise inside and outside the car.
At the same time, starting from the source, the inevitable engine vibration noise is a problem that affects the performance of the vehicle NVH. However, the ATR active torque lever system equipped with Tianlai can complete this task very well. The system monitors the vibration of the engine through electronic unit control and generates reverse vibration to counteract the resonance, ultimately preventing the vibration of the engine from being transmitted to the interior of the car. Moreover, this device is not common in the same class, and is generally only installed on higher-level models.
In addition, Tianlai also has an active noise reduction function, similar to our common noise reduction headphone principle, which is active detection of ambient noise, real-time calculation by the chip, and finally through the speaker broadcast reverse sound to counteract the noise. For headphones, the processing of noise reduction is relatively simple, because factors such as space and position do not need to be considered.
Cars, by contrast, are much more complex. On the one hand, noise sources are more complex and analytical. On the other hand, the application space is larger, and more than more powerful speakers are needed in the right position to achieve better results. Tianlai's ANC active noise control system detects engine and environmental noise in real time through the microphone in the car, and emits the same frequency reverse sound wave through the speaker, effectively canceling the noise during the vehicle.
The BOSE hi-fi 9 speaker sound system equipped with some models can also be combined with the vehicle audio system through the independent tweeters on both sides of the front row, which broadens the sound range and carefully restores the high and low audio sounds, delicate and realistic.
It should be pointed out in particular that the model used by Tianlai in the "Quiet Star" test is the 2021 Tianlai 2.0L XL Comfort Edition with an official guidance price of 187,800 yuan, and the test of anC active noise reduction system and ATR active torque rod system was not opened in the test.
It is foreseeable that if the configuration of the model purchased by consumers includes an ANC active noise reduction system, ATR active torque tie rod system and other related active noise reduction and vibration reduction functions, it will also obtain a better quiet and comfortable driving experience during driving.
Youthful design is more than comfort
Looking at the current mid-level car market, each brand is focused on creating its own star products, some focus on performance, some of the main configuration, and some are committed to accurate control, of course, there are models that focus on comfort, in many models that attract consumers with comfort, Tianlai is undoubtedly the most prominent one.
As we all know, as one of the most representative models of Japanese mid-level cars, since entering the domestic market in 2004, Tianlai has quickly won the recognition of consumers with its stable appearance and luxurious and rich configuration, and its distinguished and elegant image has long been deeply rooted in the hearts of the people. The seventh generation of Tianlai, which is currently on sale, has won the pursuit of young consumers with its youthful design and strong performance.
With the blessing of the latest V-Motion 2.0 design language of the Nissan family, the honeycomb grille combined with the unique shape of the boomerang LED headlights, coupled with the low body posture, creates a wide-body coupe visual sense for the Tianlai, which is unique in the class and highly recognizable.
As one of the representative models of the B-class joint venture sedan, The interior design of Tianlai is staggered, and the simple and clear central control layout is more in line with today's mainstream aesthetic. Inspired by astronauts' comfortable posture in zero gravity, the newly designed Multi-Layer ergonomic seat provides fit support from the waist to the back, effectively reducing muscle and spine loads and resisting the fatigue of long driving.
In addition, The natural position in the scientific and technological configuration is also commendable. First of all, in terms of intelligent driving, its ProPILOT super intelligent driving is the first L2-level automatic driving assist technology in the domestic joint venture mass production of high-end cars, which can achieve automatic follow-up and smooth steering in the 0-144km/h full-speed segment, and even if it encounters a curve, it can always keep moving smoothly in the center of a single lane.
In terms of intelligent interconnection, the nissan Connect Nissan Zhilian system adds, covering voice control, full-time navigation, in-vehicle WIFI hotspots, online entertainment and other functions, through three-screen linkage (head-up display, 8-inch suspension central control screen, 7-inch LCD instrument), so that drivers can fully control the driving information.
In terms of power, Tianlai has two systems of 2.0L naturally aspirated power and 2.0T turbocharging, of which the 2.0T model is equipped with a VC-TURBO super variable engine with a variable compression ratio engine, which has a maximum power of 179kW, a peak torque of 371N·m, and an acceleration time of only 6.4 seconds per 100 kilometers. At the same time, the 6.6L 100 km fuel consumption also performs well in the same class of 2.0T engines.
Finally, in terms of safety, Tianlai has undergone a series of rigorous tests. For example, in the crash test of China Insurance Research Institute, Tianlai has obtained full G (excellent) results in the project ratings such as the occupant safety index, the pedestrian safety index and the auxiliary safety index, and the five-star safety quality once again confirms its ultra-high safety performance.
In addition to the reliable body structure, Tianlai is also equipped with NISSAN i-SAFETY intelligent active safety system at the active safety level, covering up to 11 active safety equipment, which can assist drivers to actively predict potential safety hazards in advance in the case of untimely manual response, and use the power of science and technology to continuously protect the safety of drivers and users.
summary:
At present, many car companies have begun to work hard in the "invisible place" in the car, although the cost of car research and development will increase, but this is also a necessary way to improve. In summary, it is precisely because of the efforts and persistence of Dongfeng Nissan Tianlai for the invisible "metaphysics" of NVH that it can achieve a well-deserved good product.
At the same time, Tianlai also integrates cutting-edge technologies in three major fields, such as intelligent power, intelligent driving and intelligent interconnection, and believes that in the increasingly fierce competition in the auto market in the future, it will also bring a better travel experience to more young consumers as a master of Nissan Zhixing.