In the past two years, a phenomenon has emerged in the sedan market, and more and more A-class models have been sold to a price close to or even overlapping with the B-class car through wheelbase lengthening and increasing the number of distributions. There is more than one reader of the driving party who asks "how to choose the A-class car and the B-class car at the same price, and where are the advantages of the B-class car".
Driving Shipai once replied to readers, "As a mid-to-high-end car, the advantages of B-class cars such as power specifications and chassis are often not easy to reach, especially the sense of grade presented in terms of 'quiet and comfortable'. ”
In this article, we take dongfeng Nissan Tianlai as an example to analyze the efforts made by mid-to-high-end cars in terms of quiet comfort. In fact, the comfort attributes of Tianlai have always been the advantage of high consumer awareness, but most consumers only stay at the "big sofa" level for the comfort of Tianlai, and do not know much about Tianlai's achievements in acoustics, that is, quiet comfort. In fact, quiet and comfortable is the hidden strength of Tianlai's conquest of the high-end car market, even if the luxury brand B-class car is pulled in for horizontal evaluation, Tianlai is also very capable of playing in this regard.
Hardware is the basis for comfort and tranquility
Overall, the sound comfort of sitting in a car can be divided into a sense of quiet, softness, and pleasure.
The sense of quiet is the basis of quiet and comfort, and the definition of quiet sense is mainly the level of noise control is good - including the efficient isolation and filtering of road noise, wind noise and engine noise when driving at high speed, such as the performance of noise in the car when there are trucks, engineering vehicles and other large vehicles passing by.
Softness refers to the quality of sound - whether the sound of the engine at high speed is smooth and pleasant, whether there is a texture when the chassis vibration is transmitted to the car through the body, etc., the performance in this regard is often where the sense of serenity and comfort lies;
The sense of pleasure is further improved on the basis of the previous two points, such as when the car machine plays music, when the voice dialogue of the car machine is activated, whether the sound emitted by the car audio can bring people a pleasant feeling, which is a plus point for quiet and comfortable.
Tianlai can achieve quiet and comfortable, first of all, from the scientific research and development and solid materials at the body hardware level, and the high efficiency strengthens the vehicle's ability to suppress noise.
These include high-strength double-glazed soundproof glass for the front windshield and side doors and windows, and all of Tianlai's models are based on this standard and have not simplified the configuration on low-end models. Its double-layer sound insulation glass adopts three-layer extrusion technology, the middle is a polymer PVB film sandwich, which cooperates with the upper and lower two layers of glass to combine sound insulation and sound absorption, greatly reducing the external noise transmitted to the car.
Second, a variety of suction and sound insulation materials are added in many places on the body. One of the highlights is the addition of double suction sound insulation materials: TianLai uses double-layer sound insulation cotton at the top, bottom, front wall, etc. of the vehicle, which is an innovation in the same level; at the same time, TianLai adds a damping pad to the sheet metal parts that are prone to vibration to suppress vibration, and its material is the most used in the Japanese product brand.
Third, the engine compartment uses active torque tie rod system (ATR) technology to digest vibrations and reduce noise.
Fourth, the soft wrapping area of the interior of Tianlai is very large, coupled with the characteristics of the "big sofa" seat filling layer and the thick foam layer, which helps to further weaken the noise entering the car, reduce and weaken the reflection of sound waves in the car.
While physically isolating and reducing noise, Tianlai also has a scientific and technological means - active noise reduction. The technical principle is based on the real-time detection of engine and ambient noise by the microphone in the car, and then the same frequency reverse sound wave is emitted through the speaker, which effectively cancels out the noise during the vehicle's travel. This is similar to the principle of noise-canceling headphones, but there are not many models in mid-to-high-end cars that offer active noise cancellation, and Tianlai has had this configuration for a long time - in my impression, it is almost the same as the Infiniti QX50.
Tianlai NVH professional test score
In summary, Tianlai has built a solid foundation at the hardware level in terms of sound insulation and noise reduction. Therefore, it is not surprising that Tianlai got a high score in the relevant tests of the industry.
The 2021 China Mass Production Car Performance Competition CCPC Professional Station evaluated the participating models with 80 decibels of noise outside the car, among which Tianlai surpassed the participating models from different sectors of The Volvo, BMW, Audi, Honda and other brands with a score of 50.8dB, and won the first place in the medium and large car group.
On the eve of World Noise Day on April 16, the authoritative organization China Automobile Advantech Certification Center conducted a quietness test on Tianlai, which became the first B-class joint venture sedan to win the title of "Quiet Star". In terms of noise data at the outer ear of the main and co-pilot who are most susceptible to noise, Tianlai has a measurement point coefficient of 3090 in the driver's outer ear and 3094 in the external ear of the co-pilot, which is better than the highest rating standard; the front cabin and exhaust pipe port are the test points with the highest weight, and Tianlai is also better than the highest rating standard.
It is worth noting that the Tianlai model used in the test of the China Automobile Advantech Certification Center is the 2021 Tianlai 2.0L XL Comfort Edition, which is the sub-low version with an official guidance price of 187,800 yuan, and the ANC active noise reduction system and ATR active torque tie rod system were not involved in the test. This confirms the aforementioned Tianlai sound insulation and noise reduction materials of the high and low models of the whole system one.
The test data of authoritative institutions for Tianlai have also been mutually confirmed in the evaluation system of non-institutional big V. In the "Top 10 Models with Low Noise at 40km per Hour" announced by the NVH Professional Test Big V "Dr. Zheng Barton", Tianlai is the only mid-to-high-end car, and ranks ahead of the Cadillac CT6 with a performance of 56.6 decibels, and Tianlai is also the lowest guiding price among the top 10 models.
Subjective evaluation of the sense of softness and pleasure
In addition to noise reduction, there is also a consideration of whether the sound is harmonious and good in the quiet and comfortable of the car. Excellent sound performance is soft, delicate, and can make people feel the sense of luxury. The presentation of Tianlai's "softness" in terms of quiet comfort is not unrelated to advanced engine technology, solid body hardware and mature tuning.
I myself have test-driven a 2.0T super variable engine model, and I am impressed by the sound performance of the engine at different speeds - it is very quiet when it needs to be quiet, but it is not noisy at high engine speeds, and the soft speed sound and efficient exhaust system can bring people a relaxed and pleasant driving. In addition, Tianlai also provides a sound wave simulator, which can stimulate the sense of auditory activity when the owner wants to have some driving pleasure.
When driving through the broken road, the sound transmitted to the car also has a sense of high-quality after being isolated, filtered and treated by the chassis and suspension. This performance is generally due to the good rigidity of the body, which also shows that the stiffness matching and bushing optimization of the various connection points from the tire to the suspension chassis to the body are in place.
Then comes the final stage of quiet comfort: pleasure. Generally speaking, the audio configuration of B-class cars is generally higher than that of A-class cars, which is also determined by the comprehensive cost of higher vehicles. In addition, the audio specifications of the tianlai top model are extremely high.
Nissan teamed up with luxury audio brand BOSE to create a 9-speaker car audio system (including an 8-channel custom balanced digital amplifier) for Tianlai. Independent tweeters are set up on both sides of the front row, and after cooperating with the vehicle audio system, the sound range is broadened and the audio sounds of the middle and high levels are carefully and fully restored, and the hearing will be more delicate and realistic. In addition to playing music better, another advantage of high-end audio is reflected in the voice of the car machine, and the higher specification pronunciation unit makes the pronunciation of the car girl more three-dimensional, sweet and plump, and there is no discomfort brought by the high-frequency vocals.
The driver concluded with >>>
The reason why B-class cars are called "mid-to-high-end cars" is inevitable. B-class cars can often achieve a good balance of economy and luxury in terms of cost, and can bring people a sense of luxury in terms of quiet comfort, which is unmatched by A-class cars.
In addition, different cars have different personalities, if you are very concerned about the high-quality and high-grade acoustic environment in the car, and agree with the importance of quiet comfort in the composition of the luxury of the car, then you can pay more attention to the performance of different products in this regard when choosing models.
Wen | Zhang Junling
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