标签： 南京喝茶服务2021

Is your car a dual clutch gearbox? Will you buy a car equipped with a dual clutch gearbox?

In recent years, in order to get rid of the intellectual property rights and technical restrictions of AT gearbox and gearbox, some car companies have achieved overtaking in corners of automatic gearbox. Coupled with the advantages of direct shifting, small power loss, light weight and low fuel consumption of dual-clutch gearbox, the majority of car companies have increased the research and development and production of DCT dual-clutch gearbox, and achieved remarkable results, and a large number of dual-clutch gearboxes with excellent technology and stable performance have emerged.

The dual clutch automatic transmission is based on the manual gearbox. Different from the manual gearbox, two clutches in the dual clutch are connected with two input shafts, and the gear shifting and clutch operation are realized automatically through the mechatronic module integrating electronic and hydraulic components.

Powershift can be divided into dry type and wet type, and the main difference is the different cooling methods. Dry powershift is cooled by air, while wet dual clutch is cooled by oil. The cooling effect of oil is better than that of air, especially in the scene of frequent clutch use. Therefore, the wet dual clutch automatic transmission has the characteristics of good ride comfort, strong stability and long service life, which is more popular among consumers and becomes the mainstream of dual clutch.

The following small series will lead you to learn about the top 10 mainstream DCT gearboxes in China and see who is the strongest.

The above are ranked according to the torque they bear.

Dongfeng 6DCT150 is a wet dual-clutch gearbox jointly produced by Dongfeng and Getrag Company. Established in 2012, Dongfang Style Traak Automobile Gearbox Co., Ltd. is a joint venture established by Dongfeng Company and Getrag International Company, each holding 50% of the shares, to jointly develop, manufacture and sell low-torque dual-clutch gearboxes. In the second half of 2014, the design of 6DCT150 wet dual-clutch gearbox was finalized, with six forward gears and one reverse gear, which can withstand the torque of 150Nm. Later, engineers further improved that the current maximum torque can withstand 200Nm, and it does not exceed 60 kg after filling oil. Using the unique micro-sliding friction technology of Getrak, after the clutch is fully combined, a thin oil film will be attached between the friction plate and the clutch plate, which can effectively alleviate the instantaneous speed or torque fluctuation and bring a smoother driving experience. The gearbox is a lightweight and compact third-generation powershift, equipped with cascade gears and intelligent execution system, and its transmission efficiency, fuel economy, shift comfort and other indicators have reached the leading level of similar products.

The gearbox matched by Beijing Hyundai Elantra 1.4T is D7GF1 dry dual clutch gearbox produced by Beijing Hyundai Elantra, with the maximum torque of 220 Nm. The reliability and stability of 6at gearbox produced by Mobius are very high, second only to. This 7-speed dry dual clutch adopts motor-driven shift technology, and its internal components are mainly two dry dual clutches, two clutch actuators, two sets of shift actuators and three-axis planetary gear sets. In terms of reliability, it is higher than most dual clutches on the market, but the inherent problems of dry dual clutches such as fear of heat and low speed frustration are still not well solved. In the case of extreme congestion, these two gearboxes may have overheating protection, and the market reputation is average.

In order to get rid of the dependence on Aisin 6AT gearbox, Volkswagen is the first car company to popularize dual-clutch gearbox on a large scale, and it is also an example for some domestic car companies to learn and imitate. Volkswagen DQ200 is a seven-speed dry dual-clutch gearbox, which can bear the maximum torque of 250NM. At present, it is produced by Volkswagen Transmission Dalian Co., Ltd. in China. DQ200 has the advantages of fast shifting speed, simple structure, high transmission efficiency and good fuel economy, with a weight of only about 70KG. It is mainly matched with Volkswagen 1.4T engine and is widely used. There were many complaints in the early days, but with the continuous improvement of production technology, the proportion of complaints about this gearbox is gradually decreasing. However, the inherent disadvantage of dry dual clutch is that there is no cooling of gearbox oil. In the process of frequent start and stop of dry dual clutch, the clutch is easy to overheat, which leads to clutch plate jitter, abnormal noise and even damage.

Jianghuai is one of the earliest independent automobile companies in China to develop DCT dual-clutch gearbox, and it mainly cooperates with others. Its clutch module and electromagnetic box are from Bogwarner, and TCU software program is from Germany. The net weight of JAC’s 6th gear powershift is only about 71.5kg, which is due to its two sets of internal and external nested shafts. 6DCT gearbox adopts JAC’s unique patented clutch protection design, with two additional clutches. When the clutch is overloaded, it can quickly turn on overload protection and safety cut-off. In order to realize automatic transmission control, there are as many as 12 sensors connected in TCU control unit, which can effectively monitor the working state of the whole machine in real time and cope with various complex environmental conditions. Jianghuai 6DCT gearbox optimizes the gear position and gear arrangement, reduces idling parts, shortens the axial length, and effectively improves the product compactness. The gearbox also adopts high-precision and high-efficiency internal meshing rotor oil pump and new DCT special lubricating oil, which greatly reduces the energy loss of the system, makes the fuel consumption of the whole vehicle close to the level of manual transmission with the same gear number, and the transmission efficiency is as high as 95%.

It is one of the earliest manufacturers of dual-clutch gearbox in independent brands. "DM21", a new generation of MEGA TECH 7-speed wet powershift, is the latest fist work of SAIC. The total weight of the transmission is 82KG, which is the third generation product independently developed by SAIC. The economy, ride comfort and durability have been further improved, and the torque capacity has reached 300Nm, which has changed the problems of the previous generation gearbox, such as frustration and abnormal noise. This gearbox has an ultra-high transmission efficiency of 97%, and is equipped with an original three-cavity independent cooling and lubrication system for gear cavity, hydraulic control module cavity and clutch cavity, which effectively ensures fuel economy and stability. In addition, it also uses the ultra-high pressure zero leakage control system to ensure the accuracy and speed of shifting. This one is mounted on MG6, and its overall performance is remarkable, and its shifting is smooth and silky, with both power and handling. The transmission was rated as one of the top ten transmissions in the world in 2021.

The 7-speed wet powershift used by Changan Automobile is produced by its own company, and its code name is DF727. It was successfully developed in 2017. In 2019, DF727 was applied to self-owned brand passenger cars in batches, with the production and sales reaching more than 100,000 units. DF727 is the flagship product of Qingshan Industry in recent two years. Once it was launched, it was favored by the market, with compact structure, high-precision clutch thermal management strategy and intelligent gear shifting technology. Its comprehensive transmission efficiency reaches 94.3%, and it is widely used in 1.4T and 1.5T blue whale engines in Chang ‘an, such as UNI-T, CS55, etc., with excellent power response and fuel economy. At present, there are three known models: DF727A/B/C, and the maximum bearing torque is extended from 270NM to 300NM. The actual driving experience is not bad, but the probability of DC270 being frustrated when driving on low-speed congested roads is slightly higher. The quality of the gearbox produced by Qingshan with military quality is guaranteed.The transmission was rated asIn 2021, the world’s top ten speed changes in the Dragon Pan Cup.

When it comes to gearboxes, we have to admire Chery, which is a unique brand in China and independently developed CVT15 and CVT25. However, the torque of CVT gearboxes is limited. With the equipment of Chery’s strongest 1.6T and 2.0T high-torque engines, Chery has to equip them with gearboxes with greater torque. So Chery and the cooperative 7DCT300 came into being. 7DCT300 is the third generation gearbox with intelligent execution system, which can be horizontally centered and horizontally front-mounted, and the maximum input torque can reach 320Nm. Five high-performance clutches and gear shifting are adopted, and the gears equipped with smooth gear shifting and fast response speed, accurate sliding control of clutches and high-precision equipment processing also bring excellent NVH performance to the transmission, with comprehensive transmission efficiency exceeding 96% and net weight as low as 65kg. With the advantages of leading transmission efficiency, excellent shift comfort and low power consumption electro-hydraulic intelligent execution system, 7DCT300 has been favored by many OEMs.

The 7-speed wet dual clutch used by Geely is jointly developed by Geely and Geely, and is compatible with 48V light hybrid plug-in hybrid system. 90% of the suppliers of Geely’s dual-clutch gearbox are the top suppliers in the world. Compared with the traditional dry or wet DCT, Geely 7DCT adopts the latest generation of electro-hydraulic execution system. This not only retains the oil-cooling mode of wet double clutch, but also adopts the high-efficiency motor-driven shifting process, and adopts the controllable variable oil pump, which can supply oil on demand, and improves the power efficiency to the extreme, with the highest transmission efficiency reaching 97%. The great improvement of efficiency is closely related to the reduction of internal friction, and the loss of the product itself is further reduced through a number of technologies, such as electronic gear shifting, separate electro-hydraulic control of clutch, optimization of housing to reduce lubricating oil spill, and cooperation with famous lubricating oil manufacturers to develop low-viscosity DCT oil, so as to finally reduce internal friction and improve transmission efficiency. At present, Geely is widely used in the Lectra series, etc. From the current actual use effect, Geely’s 7-speed wet dual clutch is relatively stable.

As early as 2011, BYD developed a 6-speed dry dual-clutch gearbox with reference to Volkswagen DQ200 gearbox, which is the earliest car company in China to master the technology of dry dual-clutch gearbox. In 2013, BYD introduced the 6-speed wet dual-clutch gearbox 6DT35, which is still the result of reverse research and development. This gearbox can now be seen on BYD’s Song and Song MAX models. Its maximum torque is 350Nm and its weight is 94KG. At present, it only matches some small displacement engines. According to the owner’s report, BYD’s 6-speed wet dual-clutch gearbox has problems such as frustration and abnormal sound, and its quality needs to be improved. Fortunately, in 2020, BYD launched a new 7-speed wet dual-clutch automatic transmission. By simulating various operating conditions, the transient dynamics simulation analysis was carried out, and the unbalanced load with each gear was continuously corrected, so that the gear meshing was smoother, the impact between gears was reduced, and the smoothness of the transmission was better and the failure rate was lower. In terms of durability, the official claims that it can match the service life of AT. In addition, the new gearbox has higher transmission efficiency, more fuel saving, lower noise control, more direct power, and the transmission efficiency is as high as 95%, which is already in the leading position in China.

Great Wall, a gearbox, is based on itself and draws on the strengths of others.Great Wall DCT450 seven-speed wet dual-clutch gearbox, its comprehensive quality is recognized as a high-end product in the industry at present. Mainly manifested in: first, high reliability, accessories from famous enterprises,For example, the bearing of the gearbox is Schaeffler, Germany, and the dual-clutch module is Bogwarner TCU, USA. This gearbox consists of 157 parts, of which only 18 parts such as the outer shell and gear are produced by Great Wall itself, and all others are supplied by internationally renowned suppliers. Second, the noise control is excellent, it uses very low viscosity lubricating oil, and with the design of this gear pendulum vibration reduction flywheel, the noise of the gearbox is about 10 decibels lower than that of other similar levels; The third isIt can bear a large torque, and the maximum torque is as high as 450Nm. The adaptive models include mainstream 1.5T-2.5T gasoline engines, because the peak torque of these machines is basically between 250 and 450 nm. Fourth, the transmission efficiency is high, and the transmission efficiency of DCT450 gearbox is also very high, reaching the high standard of 95%. There are not many DCT that can reach this level, so this machine has obvious improvement effect on the performance of vehicles.

What’s your experience and feeling about the dual clutch? Welcome to leave a message and discuss in the comment area.

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　　On the evening of November 7, Didi, an online ride-hailing platform, announced that during the small-scale trial operation of Hitch, in order to ensure the safety of the trial product and service, the service time for all Hitch users will be adjusted to 5:00-20:00. That is, users will not be able to use Didi Hitch service after 8:00 pm.

　　In the announcement, Didi said, "It is our principle to provide equal services to users. We should provide services uniformly or temporarily not provide services during the same time period. We have not considered this carefully and made mistakes in decision-making. We are very sorry."

　　The previous day, Didi announced that Hitch would start trial operation in seven cities including Harbin and Beijing on November 20. What caused widespread controversy is that there are differences in the use time of male and female passengers in the trial operation plan of Didi Hitch. The service time for male passengers is 5:00-23:00, while for women it is 5:00-20:00, that is, after 8:00 pm, women cannot use Didi Hitch service.

　　That evening, Didi President Liu Qing said on his personal Weibo, as a senior female white-collar worker, I also feel that the current ride product function is not very easy to use for female students; but in terms of safety, it is a practice run on thin ice.

　　In the announcement on the evening of November 7, Didi said that after listening to the opinions and suggestions of all parties, it decided to adjust this rule, and the time for all Hitch users to provide services was adjusted to 5:00-20:00. Future product service rules will continue to be iterated and optimized.

　　According to the data provided by Didi in the announcement, according to the statistics of past safety complaints of Hitch, the number of sexual complaints in the two time periods of 20:00-23:00 and 23:00-5:00 was 45% and 465% higher than that of 5:00-20:00, respectively.

　　According to data released by the China Judicial Big Data Research Institute in 2018, night is also the peak time for criminal cases in the taxi and online car-hailing industry. In 2017, 52 cases of taxi driver crimes occurred at night, accounting for 30% of the overall crime cases of taxi drivers. Nine cases of online car-hailing driver crimes occurred at night, accounting for 50% of the overall crime cases of online car-hailing drivers.

　　Therefore, Didi said, but based on the safety data mentioned above, it decided to choose a relatively conservative plan. (Reporter, Chen Yuxi)

　　Attachment: Announcement of Didi Hitch on the evening of November 7

　　Yesterday, we announced the plan for the trial operation of Hitch, one of which was about the night service rules for users (5-20 points for female users and 5-23 points for male users), which aroused discussion and criticism.

　　Before the announcement of the plan, we did not discuss this rule with the public and did not fully listen to the opinions of all parties. At the same time, we apologize for the trouble caused to everyone due to poor consideration and improper communication.

　　After listening to the opinions and suggestions of all parties, we decided to adjust this rule. During the small-scale trial operation of Hitch, in order to ensure the safety of the trial product and service to the greatest extent, the service time for all Hitch users is adjusted to 5:00-20:00. During the practice run (no information service fee), the product service rules may continue to be iteratively optimized, and there will be various inconveniences in use. Please understand and give us suggestions.

　　Once again, I would like to express my sincere apologies for yesterday’s improper communication. Please believe in us and our safety efforts in the past year. Didi’s original intention is also to hope that all users and drivers can travel well and go home safely. But in the face of complex ride-hailing safety problems, we do have many areas that are not thoughtful and have no good policies at present. We will continue to improve in the days to come, constantly listen to opinions, and do our best to travel well.

　　-

　　In addition, we would also like to share with you our thoughts on ride-hailing safety:

　　In this trial operation plan, Hitch permanently logged off all sensitive information related to user privacy such as personalized avatar, gender, and long text evaluation; the owner of the joint ride needs to go through facial recognition, and both drivers and passengers need to check the information before getting on the bus. In the long-distance travel scenario, the number of face recognition times of the owner will be increased, the user will be reminded to set emergency contacts, and the itinerary will be automatically recorded. The user access link of Hitch has now realized full real names. The owner of Hitch and the driver of the express car need to carry out three-certificate verification, background screening and facial recognition, and the person who is discredited will not be able to register as the owner of Hitch.

　　According to the statistics of past safety complaints from Hitch, we found that the number of sexual complaints in the two time periods of 20:00-23:00 and 23:00-5:00 was 45% and 465% higher than that in 5:00-20:00, respectively.

　　According to the data released by the China Judicial Big Data Research Institute in 2018 *, in the taxi and online car-hailing industry, night is also the peak time for criminal cases. In 2017, 52 cases of taxi driver crimes occurred at night, accounting for 30% of the overall crime cases of taxi drivers. Nine cases of online car-hailing driver crimes occurred at night, accounting for 50% of the overall crime cases of online car-hailing drivers.

　　We are well aware that too many rules will harm the shared experience of car owners and passengers, but the platform still needs to make every effort to guard against human uncertainties and do everything possible to keep safety risks out. Since the ride-sharing is a private car ride-sharing relationship, the owner and the passenger are mutual assistance and the car belongs to the owner’s private space. It is impossible to force the installation of camera equipment and regular offline Security Training for the owner like the express car. Feasible measures to improve night safety are limited.

　　The trial operation time is adjusted to 5:00-20:00, which is definitely not the most perfect solution, but it is indeed a choice we made under various conditions. We have also considered adjusting it to 23:00 uniformly, but based on the safety data mentioned above, we still decided to choose a relatively conservative solution. Please understand.

　　In addition, providing equal services to users is a principle we should abide by. We should provide services uniformly or temporarily not at the same time. We are very sorry for our poor consideration and wrong decision-making.

　　Thank you to all the friends who have criticized, cared about, and helped Didi Hitch. We will carefully study everyone’s opinions and do our best to provide safe, economical, and smooth travel services.

　　* Data source: "Special Report on Judicial Big Data on Crime in the Process of Online Car-hailing and Traditional Taxi Services", China Judicial Big Data Research Institute under the Supreme People’s Court, September 2018.

　　International Online auto channel News: On February 19th, Geely Automobile officially announced that the brand-new SUV model code-named KX11 was named: Xingyue L, which is positioned as a compact SUV and forms the flagship SUV family under the CMA framework with Geely Xingyue. Among them, "L" has the meanings of Larger, Luxury and Liberate, which is not only the lengthening and widening of the body size, but also the evolution and upgrading of the whole system such as space, power, intelligence and safety, subverting new forces, joint venture classics and luxury boundaries with unparalleled future technology, and breaking through the boundaries of traditional compact SUVs.

Geely xingyue l

　　At the same time, a set of exterior and interior official maps released, the biggest highlight is the joint screen design adopted by the central control screen and the co-pilot entertainment screen. The 1-meter-long "meter-level full screen" shows a sense of science and technology, which not only enhances the advanced sense of the entire cockpit, but also breaks the single tool attribute, realizes multi-screen interaction, innovates visual experience, and conveys a new experience of intelligent interaction between people and vehicles based on future technology. According to reports, Xingyue L will be equipped with Geely’s latest digital intelligent cockpit system and higher-level automatic driving technology, and become a "super mobile intelligent terminal", bringing a new experience of smart travel.

Geely xingyue l

　　Judging from the official map of the interior, Xingyue L has adopted a brand-new design concept and luxurious technology configuration in its design, and its overall style is simple and atmospheric, and it also incorporates oriental aesthetic elements. The center console is designed with two colors, which is more charming than the domineering appearance. The neat stitching technology and delicate materials show the craftsman spirit, which makes the cockpit have its own texture and luxury, and it is more warm and comfortable in science and technology fashion. The super-large three-screen that traverses the entire center console integrates the dashboard, the central control screen and the co-pilot entertainment screen, and with the three-position sports steering wheel, the lines are outstanding and the sense of technology is bursting.

Geely xingyue l headlamp

　　In appearance, judging from the pictures of the tail of Xingyue L exposed this time, it still inherits the simple style, but the shape is simple but not simple. The through tail, with the consistent taillights, shows the design aesthetics and sports characteristics with the flagship posture of Geely 4.0 era. Combined with the official map previously exposed, it can be seen that the overall shape of Xingyue L is tall and burly, tough and atmospheric, with large-area straight waterfall vertical grille and double-row three-section light source headlights showing domineering, neat and powerful waistline and large-size wheels adding a sense of movement. The simple and textured design makes Xingyue L not only have the luxury and atmosphere of European cars, but also take into account the flexibility and dynamics of SUV models.

Geely xingyue l taillight

　　As a brand-new SUV model built under Geely CMA super matrix structure, the body size of Xingyue L is 4770mm× 1895mm× 1689mm, and the wheelbase is 2845 mm. Different from the general L models in the market, Xingyue L benefits from the flexibility and extensibility brought by CMA super matrix structure, and has a comprehensive leading intergenerational advantage in product quality, intelligent technology and intelligent interaction at the same time. It can be called the latest and highest-level product spokesperson in the era of "Science and Technology Geely 4.0" and has the global competitiveness beyond the mainstream joint venture brands.

Geely xingyue l

　　At present, SUV is the backbone of the world’s mainstream brands to expand their territory, and it is also a new force for Geely Automobile to participate in global competition. Geely Automobile, which is a latecomer, has repeatedly pioneered in the development of SUV field, leading the new era of SUV with the most cutting-edge intelligent technology SUV products. With Geely’s current cutting-edge design, cutting-edge technology and the most intelligent ecosystem, Xingyue L will break the boundary of smart car SUV led by Tesla Model Y and rewrite the market structure of high-end fuel SUV led by Tiguan L, which is called SUV breaker and subversive.

　　February 19 is also the eighth day of the Lunar New Year. Choosing to announce the naming and interior information at such a "auspicious" time, it is conceivable that Geely Automobile has high hopes for Xingyue L. As the first heavy-duty model released by Geely Automobile in 2021, the arrival of Xingyue L will not only expand the product lineup of Xingyue family, but also further strengthen the main line of SUV products of Geely Automobile to meet the needs of users for high-tech and intelligent automobile products under the new consumption format. It is believed that Xingyue L is bound to become the most "cow" SUV in China market in 2021, leading Geely Automobile to achieve another sales success in the new year and bringing users a travel experience beyond expectations. (Source: Geely Automobile)

CCTV News:When Shenzhou-12 finished its mission, it didn’t take much effort for Liu Boming to turn the handle to open the hatch. However, when Chinese astronauts completed the Shenzhou VII mission, it took a lot of effort to open the hatch. At that time, Liu Boming assisted Zhai Zhigang to get out of the cabin, but when he got out of the cabin that year, due to the pressure difference inside and outside the cabin, Zhai Zhigang could not open the hatch with great efforts. Later, in an interview, the Shenzhou VII flight crew described the situation at that time and their countermeasures.

On the afternoon of September 27th, 2008, when the eyes of the whole world were focused on China astronauts Zhai Zhigang and Liu Boming, an accident happened.

Liu Boming:I think Zhigang tried his best to pull the hatch. At that time, the hatch didn’t move at all. I feel very strange. Why can’t the hatch be pulled open when the ground is easy to do?

Zhai Zhigang:In the process of opening the door, I didn’t think that the force needed to open the door was so great at first, and I didn’t even think that the door would not be opened in the sky. Moreover, in the process of opening the door, I didn’t think that the door might be opened with great force, so I opened the door in a normal state throughout the process.

Liu Boming:At this time, it was very urgent to hear Zhigang’s breathing, because he consumed a lot of physical strength.

Zhai Zhigang:Finally, when my strength ran out and the door didn’t open, I found that I couldn’t open the door of Shenzhou VII air pressure cabin by my own strength.

Liu Boming:I went over and wanted two people to grab the handrail and pull the hatch at the same time, but the gloves were too big for two people to grab at the same time, so I had to put my hands around his right arm because he held the bulkhead with his left hand and pulled the hatch with his right hand. So it was the two of us at that time, and we almost pulled the hatch down with all our strength. The hatch was opened at an angle of 20 degrees. At this time, I felt the suction was particularly large. I felt that I was dragging the two of us up and the hatch was closed again.

Zhai Zhigang:This is a little anxious. If the door can’t be opened, then I will definitely not get out. If I can’t get out, the mission of Shenzhou VII will not be completed.

Liu Boming:At this time, it has flown into our measurement and control area, and the node for leaving the cabin has arrived, leaving us with little time.

Zhai Zhigang:In order to get out of the cabin, we have to pay too much, and we can’t open the hatch at the most critical time, so everything in front of the training is zero.

Liu Boming:In this case, I made up my mind, found the metal crowbar from the cabin and handed it to Zhigang, and then opened the hatch. At this time, the airflow instantly flowed out and the hatch naturally opened.

Zhai Zhigang:When the cabin door was pried open with an auxiliary tool, it was like opening a small window in an instant. At that time, an imaginary idiom was called be elated.

Zhai Zhigang:I’m out of the cabin and feel good!

Jing Haipeng:Liu Boming handed Zhai Zhigang the five-star red flag.

Zhai Zhigang:After Boming handed out the national flag, I didn’t think about anything else, so I showed it first.

Liu Boming:The five-star red flag is flying high in space, which proves that we have come to space.

This episode of Shenzhou VII did not appear in the extravehicular mission yesterday (July 4th). A booster handle on the Shenzhou 12 hatch makes it easier and smoother for astronauts to open the hatch. From this small power-assisted handle, we can see that our astronauts’ experience in getting out of the cabin is constantly accumulating, and the equipment used is also constantly improving. According to the plan, there will be another extravehicular activity during the Shenzhou-12 mission. We also wish the astronauts all the best in their work and life in space.