What to Do Without Auto Hold at Traffic Lights?

What are the reasons for a car not cooling?

The reasons for a car not cooling are as follows: 1. Check for refrigerant deficiency: Car air conditioners generally require refrigerant replenishment every 2-3 years. Insufficient refrigerant leads to reduced cooling efficiency. 2. Damaged air conditioning flap: A malfunctioning air conditioning flap motor is a rare but possible issue. If the flap motor fails, it becomes problematic as it is typically located in the lower middle part of the dashboard, serving as the main switch for the air vents. A failure here means the switch is broken, and even if the air conditioner can produce cold air, it will only escape through gaps. 3. Dirty condenser: The primary purpose of cleaning the radiator and condenser is heat dissipation. During spring, poplar and willow catkins can clog the condenser, leading to issues like engine overheating or poor air conditioning performance. Therefore, after spring, car owners should check if the radiator is clogged with these fibers. When cleaning, ensure to first use an air gun to blow away debris before washing with a water gun to avoid counterproductive results, which could worsen air conditioning performance and increase fuel consumption. 4. Faulty throttle or expansion valve: Malfunctions in the expansion valve or throttle directly result in poor air conditioning performance. Diagnosing these issues is complex and typically requires professional repair services.

18

3

Share

Why is the dash cam's red light always on?

Generally, dash cams have two indicator lights: a red light and a blue light. The red light indicates that the device is charging or there is a malfunction. Please check if the memory card needs to be formatted. The blue light indicates normal operation. Additionally, if the red light you are referring to is the "REC" indicator on the screen, it means the device is currently recording, which is normal. Below is some relevant information about dash cams: Functions of a dash cam: To protect the legal rights of drivers. In case of accidents involving pedestrians crossing the road, cyclists, or motorcyclists, there is a risk of being extorted. A dash cam can provide drivers with valid evidence. By reviewing the recorded footage, the responsibility for the accident becomes clear, allowing traffic police to handle the incident quickly and accurately. This enables quick clearance of the scene to restore traffic flow while preserving crucial evidence from the incident, contributing to a safer and smoother traffic environment. Components of a dash cam: Different dash cam models may have varying appearances, but they generally consist of the following basic components: Main unit - includes a microprocessor, data storage, real-time clock, display screen, lens module, operation buttons, printer, and data communication interface. If the main unit does not include a display or printer, it should have corresponding data display and print output interfaces. Other components include a speed sensor and data analysis software.

17

5

Share

Is the Motion of a Car Wheel a Translational Phenomenon?

The movement of the wheel is a rotational phenomenon, while the movement of the car body is a translational phenomenon, involving sliding friction. The ground exerts a frictional force on the outer tire of the wheel, and there is sliding friction between the hub and the wheel set. The principle of a car: The conversion of reciprocating linear motion into rotational motion enables the car to achieve linear translation. The wheel is a rotating component that bears the load between the tire and the axle, usually consisting of two main parts: the wheel cylinder and the spokes. The functions of car wheels include: bearing the entire vehicle's mass and transmitting traction force, braking force, driving torque, and braking torque; cushioning and absorbing shocks and vibrations caused by uneven road surfaces; improving the adhesion performance between the wheel and the ground. A car wheel consists of the wheel hub, the rim, and the connecting part between these two components. Since the wheel is a rotating body, it requires high dimensional accuracy, minimal imbalance, and certain elasticity and rigidity, along with fatigue resistance, lightweight, and good economic efficiency. Additionally, the wheel rim is the part of the wheel where the tire is mounted and supported, and the spokes are the supporting components between the axle and the rim on the wheel. Apart from the aforementioned components, the wheel sometimes also includes the hub.

2

0

Share

What is the speed limit for the 4 lanes on the highway?

On the highway: The first lane: 100-120 km/h (usually dedicated to passenger cars); The second lane: 80-100 km/h; The third lane: 60-100 km/h; The fourth lane: emergency lane. The highway should clearly mark the speed limit for each lane. The maximum speed should not exceed 120 km/h, and the minimum speed should not be lower than 60 km/h. Below are some precautions for driving on the highway: Check the vehicle and plan the route before driving: Before entering the highway, the driver must carefully inspect the overall condition of the vehicle, including whether various fluids are sufficient, whether the battery and lights are functioning properly, whether the brakes are reliable, and whether the tire condition and pressure are normal, etc., to be fully prepared. Try to stay away from large vehicles as much as possible: Many rear-end collisions on the highway are caused by the failure of large trucks to brake in time, often resulting in severe casualties. Additionally, large trucks have massive bodies and large blind spots in their driving vision, making them like "giant beasts" when driving on the highway.

8

3

Share

What is the minimum ground clearance of the Exeed VX?

The minimum ground clearance of the Exeed VX is 240mm. The minimum ground clearance of the Exeed VX refers to the distance between the lowest point (excluding the wheels) and the supporting plane, which indicates the vehicle's ability to pass over obstacles such as rocks and tree stumps without collision. A higher ground clearance generally improves off-road capability, but if the Exeed VX's ground clearance is too high, it may reduce stability at high speeds. The Exeed VX, designed in 2019, has the following body dimensions: length 4970mm, width 1940mm, height 1788mm, and a wheelbase of 2900mm. Typically, sedans have a ground clearance ranging from 110mm to 150mm, while SUVs have a ground clearance between 200mm and 250mm. However, the Exeed VX's ground clearance is not static—it varies depending on the load condition. Therefore, changes in ground clearance should be considered based on the vehicle's load. When selecting a vehicle, ground clearance can be one of the reference factors. The choice should depend on the vehicle's intended use and road conditions. For urban driving on well-paved roads, a lower ground clearance may enhance stability and comfort. For frequent travel on rough or off-road terrains, a higher ground clearance is advisable to avoid underbody scrapes or damage.

12

5

Share

What is the engine speed when the car is running at 120 mph?

When the car is running at 120 mph, the engine speed is generally around 3400 RPM. Below is relevant information about engine speed: Introduction to Engine Speed: The level of engine speed relates to the number of work cycles per unit time or the effective power output of the engine, meaning the effective power varies with different speeds. Therefore, when specifying the effective power of an engine, the corresponding speed must also be indicated. The effective power and its corresponding speed specified on the engine's product label are referred to as the rated power and rated speed, respectively. The operating condition of the engine at rated power and rated speed is called the rated condition. The rated power is not the maximum power the engine can produce; it is the maximum usable limit of effective power determined based on the engine's intended use. For the same engine model, the rated power value may differ depending on its application. Effective torque also varies with engine conditions. Thus, the maximum torque a car engine can output and its corresponding speed are used as indicators to evaluate the engine's dynamic performance. Speed Measurement: Typically, a speed sensor is used, corresponding to the signal teeth on the flywheel, to measure the engine speed.

10

3

Share

What to Do Without Auto Hold at Traffic Lights?

What are the reasons for a car not cooling?

Why is the dash cam's red light always on?

Is the Motion of a Car Wheel a Translational Phenomenon?

What is the speed limit for the 4 lanes on the highway?

What is the minimum ground clearance of the Exeed VX?

What is the engine speed when the car is running at 120 mph?

What to Bring for Subject 4 Test?

How Many Years Can Tires Last?

How many temporary license plates can be applied for a new car?

What is the purpose of the cigarette lighter socket?