Today, let’s take a look AT the AT gearbox and the dual clutch gearbox, which one should we choose? Please see next.

AT gearbox:Variable speed is realized by hydraulic torque converter and planetary gear set. Hydraulic torque converter uses liquid to transmit power, which can cushion the power impact of the engine; Planetary gear sets realize different transmission ratios according to different combinations.

dualclutchtransmissionThe odd and even gears are controlled by two clutches, which is equivalent to integrating two sets of manual gearboxes. When shifting gears, prepare the next gear in advance to realize fast shifting.

Shift speed: the shift speed of dual clutch gearbox is extremely fast, usually only about 0.2 seconds, while AT gearbox is relatively slow.

Transmission efficiency: the transmission efficiency of dual-clutch gearbox is high, and the power loss is small, which can generally reach about 85%-90%; The transmission efficiency of AT gearbox is relatively low, about 70%-85%.

Driving experience: the dual-clutch gearbox is more direct and neat when shifting gears, which can bring better driving pleasure, but it may have a sense of frustration when driving at low speed; The shift of AT gearbox is relatively smooth and comfortable, but the dynamic response may not be as direct as that of dual clutch gearbox.

Structural complexity: AT gearbox has a complex structure, including hydraulic torque converter, planetary gear set and other components; The structure of dual clutch gearbox is relatively simple, similar to manual gearbox.

Cost: Generally speaking, the manufacturing cost of AT gearbox is high, especially the high-end AT gearbox; The cost of dual clutch gearbox is relatively low, especially dry dual clutch.

Good ride comfort: the existence of hydraulic torque converter makes the shift process softer, the shift feeling is obvious and the driving comfort is high.

Large torque bearing: able to bear large engine torque output, suitable for all types of vehicles, including high performance and large vehicles.

Mature technology: it has a long history of development, relatively mature and stable technology, high reliability and low failure rate.

Simple operation: the driver only needs to control the throttle and brake, and there is no need to manually shift gears, so the operation is simple and easy.

Disadvantages:

Low transmission efficiency: power will be lost in the transmission process, resulting in relatively poor fuel economy.

Complicated structure: The complicated structure makes AT gearbox bulky, heavy and costly to manufacture.

Slow shift speed: compared with the dual clutch gearbox, the shift speed is not fast enough, which affects the dynamic response and acceleration performance of the vehicle to some extent.

High fuel consumption: Due to the low transmission efficiency and its own structural characteristics, the fuel consumption of AT gearbox vehicles is relatively high.

Fast shift speed: it can complete the shift operation in a very short time, and the power interruption time is short, which can provide better acceleration performance and driving experience.

High transmission efficiency: direct power transmission reduces energy loss and improves fuel economy, especially at high speed.

Simple structure: Compared with AT gearbox, it is relatively simple in structure, small in size and light in weight, and easy to install and arrange on vehicles.

Low cost: the manufacturing cost is relatively low, which helps to reduce the price of the whole vehicle.

Disadvantages:

Low-speed setback: Under low-speed driving, frequent start-stop or congested road conditions, there may be setbacks, which will affect driving comfort.

Reliability problem: There were some reliability problems in the early dual-clutch gearbox, such as clutch overheating and wear, but with the continuous improvement of technology, the reliability has been greatly improved.

High heat dissipation requirements: especially for dry dual-clutch gearbox, because there is no oil immersion to dissipate heat, long-term intense driving or frequent gear shifting will easily lead to overheating, which will affect performance and life. The wet dual-clutch gearbox dissipates heat through oil, which is relatively good, but the cost is high.

High maintenance cost: The clutch plates and other parts of the dual-clutch gearbox are vulnerable parts, which may need to be replaced after a certain mileage, which increases the maintenance cost.

So, friends, which gearbox do you prefer?

　　On July 11th, 2024 (23rd) China Internet Conference hosted by internet society of china closed in Beijing. Internet society of china released the China Internet Development Report (2024) at the closing ceremony (hereinafter referred to as the Report).

　　According to the Report, since 2023, China’s Internet industry has thoroughly implemented the spirit of the 20th Party Congress and resolutely implemented strategic plans such as the Overall Layout Plan for the Construction of Digital China. China’s network infrastructure construction has become increasingly complete, key cutting-edge technologies have been innovated and developed, the digitization level of key areas has been steadily improved, the comprehensive network governance framework has been accelerated, the network security industry has developed at a high quality, and the development of digital China has shown a good trend.

　　Specifically, China’s Internet industry presents the following development characteristics: First, in terms of basic resources and technologies, the construction of new information infrastructure such as 5G and Gigabit optical fiber networks in China is becoming more and more complete, the scale of IPv6 users and traffic of the next generation Internet is significantly improved, the construction of satellite Internet is progressing steadily, and the service capacity of optical fiber broadband network is continuously enhanced; Computing infrastructure construction has reached the world’s leading level, the proportion of intelligent computing power has increased to 30%, and the scale of cloud computing market has grown rapidly; The overall management system of data elements is more perfect, and it is a consensus to promote the development of data elements by classification; The application process of artificial intelligence industry continues to advance, and various service models gradually emerge, and the demand for high-quality data is increasingly prominent; The number of mobile Internet of Things users has increased significantly, and the application of Internet of Things has entered a period of large-scale explosion. Second, in terms of Internet applications and services, the industrial Internet has entered a new stage of large-scale development, and the number and reality are deeply integrated to serve the new industrialization construction; The e-commerce market is growing steadily, and the new kinetic energy of digital consumption is getting stronger and stronger; The business transaction application mode format continues to iterate, and new formats such as cross-border e-commerce have developed rapidly; The scale of digital entertainment users continues to climb, AIGC empowers the development of digital entertainment, and vertical large-scale model applications have landed. Third, in terms of network governance and environment, the Internet governance system has been further improved, and grassroots social governance has increased "number" and "wisdom"; The network security industry has entered a stage of rapid growth, and digital security has become a strategic guarantee for digital development.

　　Looking forward to the future, China’s Internet industry will continue to thoroughly implement the requirements for the construction and deployment of digital China. First, the construction of digital infrastructure will be further accelerated, and the deployment of new network infrastructure represented by 6G and satellite Internet will be accelerated, the layout of computing infrastructure will be further optimized, and the allocation of computing resources will be more reasonable and orderly. Second, digital technology innovation will gradually push the Internet towards intelligence. The implementation of "Artificial Intelligence+"and the rapid development of multi-modal large models will promote the new generation of artificial intelligence technology to accelerate the expansion of application scenarios. Third, the core role of algorithms, computing power and data will be more prominent. The demand for computing power development will promote the continuous improvement of independent research and development and manufacturing capabilities of high-end chips. Data resources will be coupled with artificial intelligence technology, constantly spawning new industries, new models and new formats, and generating new economic growth points. Fourth, the Chinese-style network governance framework will be accelerated, and the governance of key areas such as artificial intelligence and new technologies will gradually move towards institutionalization and legalization. The regulatory framework and principled governance rules will be more clear, and the multi-sectoral joint governance pattern will gradually take shape. Fifth, the application of industry integration will empower the interconnection of values, promote the further integration of key elements such as people, machines and data, and accelerate the digitalization and intelligent upgrading of manufacturing. Sixth, the space for international cooperation in the digital field will be further expanded, the construction of the "Digital Silk Road" will continue to advance steadily, and the scope of "Silk Road E-commerce" partner countries will be further expanded.

　　Regarding the "new network infrastructure represented by 6G and satellite Internet" mentioned in the Report, Pan Helin, a member of the Information and Communication Economy Expert Committee of the Ministry of Industry and Information Technology, said in an interview that the new network infrastructure is newer, faster and larger than the existing network infrastructure. In the field of wireless communication, 6G is new and 5G is existing; Satellite Internet is new, and ground base station communication is existing. 6G not only pursues higher data transmission speed, but also pays more attention to the intelligence, ubiquity and security of the network, aiming at realizing the seamless connection of air, space and sea integration. The satellite Internet provides high-speed Internet access services around the world through LEO satellite constellations to solve the problem of insufficient ground network coverage. The deployment of this kind of infrastructure means that the information and communication technology is evolving towards the goal of higher dimension, wider coverage and deeper integration. At the same time, it also means that China’s communication infrastructure will keep up with the world’s most advanced technical fields and maintain the leading position of communication network performance in the world, thus better empowering China’s economic and industrial development. (Author Su Deyue)

　　Xinhua News Agency, Chengdu, April 6 (Reporter Yu Li, Feng Changyong) The reporter learned from the China Giant Panda Conservation and Research Center, which has the largest captive giant panda population in the world, that the center has completed nearly half of the breeding and breeding tasks of captive giant pandas this year, and the giant panda breeding has entered a peak period.

　　By the end of 2015, the number of captive giant pandas in the center had reached 218. Zhang Guiquan, director of Ya ‘an Base of China Giant Panda Conservation and Research Center, said that this year, 26 female pandas and 19 male pandas participated in the national captive giant panda breeding program. Since the first female panda was bred in late February, as of April 6, 10 female pandas have been bred. Among them, 6 were bred by natural mating, the other 2 were bred by natural mating with artificial insemination, and the remaining 2 were completely artificially inseminated.

　　"So far, this year’s breeding work has been completed well. The biggest feature is that the natural mating rate is relatively high, and the pregnancy rate of female pandas that have successfully mated naturally is over 90%, which is a good momentum for this year’s breeding work." Zhang Guiquan said.

　　"Under the current captive conditions, the number of male giant pandas with natural mating ability is very rare, accounting for less than 5% of the population. This year, the center belongs to the 7-year-old male giant panda ‘ An An ’ The first successful natural mating at Ya ‘an base on February 29th marks the addition of a male animal with natural mating ability to the captive giant panda population, which also shows that the quality of our captive giant panda population is constantly improving. " Zhang Guiquan said.

　　According to reports, at present, the artificial breeding of captive giant pandas in China is included in the unified planning, and the optimal pairing is carried out according to the principle of eugenics, so as to ensure the genetic diversity of the population to the greatest extent. There are 56 female pandas participating in the breeding program this year, and more than one third of them are from the China Research Center for the Protection of Giant Pandas.

　　There are three major problems in the development of captive giant panda population: difficulty in estrus, difficulty in mating and conception, and difficulty in survival of cubs. According to zhangxin, the breeder of the center, giant pandas are in estrus every spring. With the increase of temperature, their hormone level, estrus behavior and mating desire will decrease from May, which will affect the mating quality. Therefore, March and April are the prime time for giant pandas to breed. In order to ensure that female pandas are pregnant, some will also receive artificial insemination as appropriate after natural mating.

　　In recent years, the artificial breeding of giant pandas in the center has been carried out at Bifengxia base in Ya ‘an. The reporter saw at the base on the 6th that the staff was preparing to breed the 7-year-old female panda "Jojo". Because Jojo’s estrus behavior was not typical enough, she was not allowed to mate naturally. In this regard, Zhang Guiquan said that this is a normal situation.

　　It is reported that female giant pandas not only have a short estrus time, but also need to mate with each other to be successful. If there is no electricity between pandas, mating may fail even during estrus. In addition, even if natural mating is successful, it is very difficult for female giant pandas to finally give birth to panda babies — — Their eggs can only survive for 36 to 40 hours. Even with breeding, only 30% to 40% of female giant pandas can get pregnant successfully, while the survival rate of their cubs is less than 40%.