Is It Necessary to Choose 4WD for the BMW 5 Series?

The Difference Between Fixed Displacement and Variable Displacement in Car Air Conditioning

The difference between fixed displacement and variable displacement compressors: 1. Fixed displacement compressor: Under different working conditions (temperature, speed, mode), the displacement remains unchanged, so the low-pressure changes are significant. Under high temperature and idle conditions, it can reach 3bar. Under low temperature and high-speed conditions, it is below 1.6bar (depending on temperature control) for defrost protection, with repeated fluctuations. Variable displacement compressor: When the suction pressure is above 1.6bar, the compressor always operates at maximum displacement. When the displacement is excessive, causing the low pressure to drop below 1.6bar, the displacement is reduced to maintain the low pressure around 1.6bar. Only in rare cases when the displacement is at its minimum, usually 10% of the maximum displacement, and the low pressure still drops, the compressor is cut off for defrost protection. 2. When the variable displacement compressor operates at full displacement, there is no difference in low pressure compared to the fixed displacement compressor. When the variable displacement compressor operates at small displacement, the compressor's low pressure is maintained at the set pressure, which is slightly higher than that of the fixed displacement compressor.

4

2

Share

What do MT and CVT mean in cars?

MT stands for manual transmission, and CVT stands for continuously variable transmission, a type of automatic transmission. 1. Meaning of MT: Manual transmission, also known as mechanical transmission, requires the driver to manually shift the gear lever (commonly referred to as the "gear stick") to change the gear engagement inside the transmission, altering the gear ratio to achieve speed variation. Most passenger car manual transmissions are six-speed or five-speed gear transmissions with synchronizers, making shifting convenient and reducing noise. When operating a manual transmission, the clutch must be depressed to shift the gear lever. 2. Meaning of CVT: The CVT eliminates the complex and bulky gear combination for speed variation, using only two sets of pulleys for transmission. It changes speed by altering the contact radius of the drive belt between the driving and driven pulleys. Since CVT can achieve continuous changes in gear ratio, it provides the best match between the transmission system and engine conditions. Unlike traditional transmissions with gear structures, CVT uses two adjustable-diameter pulleys connected by a belt. The basic principle involves wrapping the belt around two conical pulleys, with the pulley diameter adjusted via hydraulic pressure for continuous variation. At startup, the driving pulley has the smallest diameter, while the driven pulley has the largest, achieving a high gear ratio. As speed increases and sensor signals change, the computer control system adjusts the hydraulic pressure to continuously vary the pulley diameters, enabling seamless speed variation throughout the driving process.

6

1

Share

Where is the sunroof switch for the Volkswagen Sagitar located?

The sunroof switch for the Volkswagen Sagitar is located on the front overhead reading light panel. Here are some details about the Sagitar's sunroof: 1. The sunroof measures 80cm in length and 70cm in width, with a daylight opening area of 0.56 square meters, offering two options: tilt or fully open; 2. With the vehicle started, move the switch to the tilt position and press it to control the sunroof's opening/closing state; 3. With the vehicle started, move the switch to the fully open position and press it to automatically operate the sunroof to its final position. Press the switch again to stop the automatic opening/closing function.

15

5

Share

Is Lynk & Co a subsidiary of Geely?

Lynk & Co is a company under Geely Holding. Lynk & Co is a joint venture established by Geely Holding Group, Geely Auto Group, and Volvo Cars. It is a premium automotive brand that combines European technology, European design, global manufacturing, and global sales. Guided by the 'Five Highs' product development philosophy, Lynk & Co aims to create a globally competitive premium brand. The 'Five Highs' are: 1. High Aesthetics: Based on four core elements—self, respect, subversion, and depth—the brand's urban contrast aesthetic design philosophy has matured, creating a family-style product identity that gives Lynk & Co products a unique and premium aesthetic. 2. High Performance: Shared Drive-E powertrain technology with Volvo, combined with advanced transmission, drivetrain, and braking systems from top global suppliers, ensures robust performance. 3. High Technology: The CMA (Compact Modular Architecture) platform provides Lynk & Co with strong technological leadership. 4. High Safety: Lynk & Co's unique 'Comprehensive Safety Concept' covers five aspects—active safety, passive safety, pedestrian safety, environmental safety, and property safety—to provide all-round protection. 5. High Value: Sharing the same high-standard supplier management and world-class suppliers as Volvo Cars, along with comprehensive ownership and usage services, delivers an unparalleled sense of value to users.

16

2

Share

Is Tire Bulging Covered Under the Three Guarantees Policy?

Tire bulging and its coverage under the Three Guarantees Policy: 1. Most new car tires come with a one-year warranty. If bulging or other issues occur during the warranty period and are confirmed by national authoritative departments to be caused by manufacturing defects, such cases are covered under the Three Guarantees Policy. The manufacturer will provide compensation or replacement according to the policy. 2. If the bulging is due to the car owner's own actions, it is not covered, and the 4S store cannot provide a free replacement. 3. Regardless of whether it's due to scratches or quality issues, when tire bulging is detected, consumers should immediately take the vehicle to a 4S store for inspection. If unsatisfied with the inspection results, they can request the 4S store to send the tire to the manufacturer for further evaluation to obtain an official report identifying the cause of bulging. Alternatively, consumers can opt for specialized inspection agencies or send the tire back to the manufacturer or a quality inspection institute for examination. 4. It's crucial to note that a bulging tire should not be used further, as it significantly increases the risk of a blowout, especially during high-speed driving. Tire bulging occurs when the internal cord layers are damaged, as these layers form the tire's structural skeleton. When cords break, only the elastic rubber remains to support the tire, leading to bulging at the damaged areas under pressure.

18

4

Share

U-turn or Turn Around for Cars?

Both "U-turn" and "turn around" refer to a car reversing direction. More specifically, "U-turn" means vehicles or ships turning to the opposite direction, while "turn around" means reversing direction, and both can be used in traffic contexts. Below are specific techniques for making a U-turn: Priority on Steering Correction: During a U-turn, "steering correction" plays a crucial role in changing the car's direction and position. Therefore, beginners should always remember to "correct the steering first, then stop" before each halt. Avoid Forcing the Steering Wheel: When making a U-turn, never force the steering wheel (turn it to the limit) before starting or after stopping, as this can damage steering components, increase free play in the steering wheel, and cause unnecessary tire wear. Before each stop, the distance between the left and right wheels and the roadside will differ. Thus, when judging the stopping distance, use the wheel closest to the roadside as a reference. In areas with obstacles or buildings, also pay attention to the front and rear bumpers and the vehicle's height. Using Half-Clutch Technique: On roads with a side slope, you can use the terrain and the "half-clutch" technique to rock back and forth for a U-turn without frequent gear shifts. Note that the "half-clutch" should not be used for extended periods, especially not as a substitute for braking. In hazardous areas like cliffs, deep ditches, or obstacles, always point the car's front toward the danger for better visibility. Additionally, after stopping with the front facing danger, be extra careful not to engage the wrong gear when restarting. On slopes, strictly follow the hill-start procedure.

19

3

Share

Is It Necessary to Choose 4WD for the BMW 5 Series?

The Difference Between Fixed Displacement and Variable Displacement in Car Air Conditioning

What do MT and CVT mean in cars?

Where is the sunroof switch for the Volkswagen Sagitar located?

Is Lynk & Co a subsidiary of Geely?

Is Tire Bulging Covered Under the Three Guarantees Policy?

U-turn or Turn Around for Cars?

What are the advantages of Chery's 9-speed CVT over the 7-speed?

Is Toyota a Japanese Car?

What does the front parking light mean?

Can Scratches on the Front Bumper Plastic Be Repaired?