What is the meaning of the BMW logo?

Why do domestic cars prefer to use dual-clutch transmissions?

Domestic cars prefer to use dual-clutch transmissions for the following reasons: 1. Low production cost: Although the initial investment in dual-clutch production is relatively high and the per-unit cost is higher, the cost can be reduced by more than half as it becomes more widespread, making it much cheaper compared to transmissions from Aisin and ZF. 2. Simple production process: After more than a decade of development in the automotive industry, domestic mainstream car manufacturers have gained rich experience in the production technology and R&D of manual transmissions. The machinery and equipment used to produce manual transmissions can be directly repurposed for dual-clutch transmissions, and previous production experience can also be applied to the R&D and production of dual-clutch transmissions. 3. Avoiding technological barriers and achieving overtaking in corners: Traditional AT automatic transmission technology is already mature, and domestic manufacturers started late in this field, making it difficult to achieve breakthrough development. However, the technological gap in dual-clutch transmissions is smaller, and domestic manufacturers can strive to overcome core technologies to achieve overtaking in corners. 4. Low technical threshold: The patents for AT and CVT transmissions are largely monopolized by foreign transmission giants. However, the technological gap for dual-clutch transmissions is smaller, and the technical threshold is lower. For example, Great Wall independently developed a 7-speed wet dual-clutch transmission, whose dual-clutch module was developed by BorgWarner.

5

3

Share

Will 2000-grit sandpaper damage car paint?

2000-grit sandpaper can damage car paint. 2000-grit sandpaper is generally used to polish car paint scratches, which will cause some damage to the car paint. After sanding, it needs to be polished and restored with a polishing machine, and finally waxed. Generally, sandpaper on the market is divided into four types: 320-grit, 600-grit, 1000-grit, and 2000-grit. The larger the grit number, the smaller the abrasive particles. Here is some relevant information about sandpaper: 1. Concept explanation: Sandpaper, commonly known as sand skin, is a material used for grinding, used to polish surfaces of metal, wood, etc., to make them smooth and even. It is usually made by adhering various abrasive particles to the original paper. Depending on the abrasive material, there are various types such as emery sandpaper, artificial emery sandpaper, and glass sandpaper. 2. Specifications: Generally, sandpaper comes in grits such as 80, 120, 180, 240, 320, 400, 600, and 1000. The higher the grit number, the finer the polishing effect, and the smoother the polished surface will be. The 2000-grit specification is relatively high, and its polishing effect is among the better ones. It is often used in most 4S shops or auto repair shops to repair scratches.

9

0

Share

Can the camera capture rear seat passengers not wearing seat belts?

Rear seat passengers not wearing seat belts can be captured by the camera. Current high-definition cameras can clearly record the situation inside the vehicle and the facial features of the driver, as well as whether rear seat passengers are wearing seat belts. This is mainly because after the upgrade of high-definition cameras, their precision has reached the decimeter level, combined with high-definition snapshots, making it very clear to record whether rear seat passengers are wearing seat belts. Below is relevant information about seat belts: 1. Concept explanation: Seat belts are a type of active safety equipment in vehicles, widely used in cars and airplanes. They are divided into two types: one is the pre-tensioner seat belt, which can predict a strong impact force during a frontal collision accident, thereby quickly tightening the seat belt to enhance its restraint on the occupants. The other is the load limiter seat belt, which can limit the force acting on the seat belt to a certain extent during an accident, protecting the chest from severe impact. 2. Working principle: There is a locking mechanism inside the seat belt. When pulled gently, the seat belt can be easily extended and fixed in position; when pulled quickly, the internal locking mechanism will be activated by centrifugal force due to the rapid movement of the seat belt, immediately locking the seat belt to restrain the passenger. Modern seat belts are becoming increasingly advanced, even incorporating electronic controllers. Under ABS anti-lock braking conditions or during high-speed emergency braking, the seat belt will lock according to different speeds, thereby protecting the safety of the driver and passengers.

17

1

Share

What are the advantages of a dual-clutch transmission?

Advantages of dual-clutch transmission: 1. High transmission efficiency and fast gear shifting: The gear shifting time of a dual-clutch transmission is very short, faster than that of a manual transmission, taking less than 0.2 seconds. 2. Reduced fuel consumption: Because the dual-clutch transmission eliminates torque interruption, the engine's power is continuously utilized and always operates at its optimal level, resulting in significant fuel savings. Compared to traditional planetary gear automatic transmissions, it is more conducive to improving fuel economy, with fuel consumption reduced by approximately 15%. 3. High comfort: Due to the fast gear shifting speed, each gear shift in a DCT is very smooth, with minimal jerkiness that is hardly noticeable to the human body. Disadvantages of dual-clutch transmission: 1. Higher cost: The structure of a dual-clutch transmission is complex, and the manufacturing process requirements are relatively high, resulting in higher costs. Therefore, dual-clutch transmissions are typically equipped in mid-to-high-end models. 2. Torque issues: Although the torque capacity of a dual-clutch transmission can absolutely meet the requirements of general vehicles, it is still insufficient for intense usage. Dry clutches generate too much heat, while wet clutches lack sufficient friction. 3. Lower efficiency: Due to the presence of electronic control and hydraulic systems, the efficiency of a dual-clutch transmission is still inferior to that of a traditional manual transmission, especially for wet dual-clutch transmissions used to transmit high torque.

3

4

Share

What are the differences between the 2020 and 2021 Challenger 300 models?

Here are the relevant introductions about the differences between the 2020 and 2021 Challenger 300 models: 1. Different configurations: Mainly the drivetrain components. The 2020 Challenger 300 uses SHIMANO-M610 for both front and rear derailleurs. The 2021 Challenger uses SHIMANO M618 for the front derailleur and SHIMANO M670 for the rear derailleur, which are higher-end than those on the 2020 Challenger 300. 2. Different target users: The 2020 Challenger 300 is suitable for beginners, mountain biking, and light off-road use, with some potential for future upgrades. The 2021 Challenger is more suitable for those who want to modify and upgrade, replacing the wheelset, fork, and drivetrain components with mid-to-high-end parts.

8

1

Share

What is the highway fuel consumption of the Tang DMI?

The highway fuel consumption of the Tang DMI is 6.55 liters. Relevant information about car fuel consumption is as follows: 1. Constant-speed fuel consumption: This refers to the fuel economy indicator when the car is driving at a constant speed on a good road surface. Since constant-speed driving is a basic operating condition for cars on highways, and this type of fuel consumption is easy to measure, it is widely adopted. 2. Road cycle fuel consumption: This is the fuel economy indicator measured when the car is driving in repeated cycles according to specified speed and time norms on the road, also known as multi-condition road cycle fuel consumption. The speed and time norms specify various driving conditions included in each cycle, as well as the shifting moments, braking and stopping times, driving speed, acceleration, and braking deceleration values for each cycle.

6

0

Share

What is the meaning of the BMW logo?

Why do domestic cars prefer to use dual-clutch transmissions?

Will 2000-grit sandpaper damage car paint?

Can the camera capture rear seat passengers not wearing seat belts?

What are the advantages of a dual-clutch transmission?

What are the differences between the 2020 and 2021 Challenger 300 models?

What is the highway fuel consumption of the Tang DMI?

How to Identify Genuine Automotive Explosion-Proof Film?

What Are the Reasons for High Engine RPM but Low Speed in Motorcycles?

When is the implementation time of China VI emission standards?

How Many Questions Are There in the Subject 1 Test?