What are the maintenance cycle items for the BMW 5 Series?

What are the control methods of automotive circuits?

Automotive circuit control methods include: 1. Power circuit: Also known as the charging circuit, it consists of the battery, generator, regulator, and charging indicator device; 2. Starting circuit: Composed of the starter, relay, starting switch, and starting protection circuit; 3. Lighting and light signal device circuit: Includes headlights, fog lights, clearance lights, turn signals, brake lights, reverse lights, interior lighting, and related control relays and switches; 4. Ignition circuit: Consists of the ignition coil, distributor, electronic ignition controller, spark plugs, and ignition switch; 5. Instrument information system circuit: Made up of instruments and their sensors, various warning indicators, and controllers; 6. Electronic control system circuit: Comprises the engine control system, automatic transmission and cruise control system, anti-lock braking system, and airbag control system.

15

2

Share

Where is the fuel tank switch of Bestune X40?

Bestune X40 fuel tank switch is located near the door under the driver's seat, and its function is to open the fuel tank cover. Taking the 2019 Bestune X40 as an example, its body structure is a 5-door, 5-seat SUV with body dimensions of 4310mm in length, 1780mm in width, 1680mm in height, a wheelbase of 2600mm, a fuel tank capacity of 50 liters, a luggage compartment capacity of 375 liters, and a curb weight of 1325kg. The 2019 Bestune X40 has a front suspension of MacPherson independent suspension and a rear suspension of torsion beam non-independent suspension. It is equipped with a 1.6L naturally aspirated engine with a maximum horsepower of 114PS, a maximum power of 84kW, and a maximum torque of 115Nm.

12

0

Share

What does AC on car air conditioning mean?

AC in cars is the abbreviation of air-conditioner, which means the air conditioning cooling switch, and can also be simply understood as cold air. Here is its introduction: When the air conditioning is turned on, turning on the AC will activate the car's compressor, and the air blown will be cold. If the AC is not turned on, the car's compressor remains off, and the air blown will be natural air. Here are some precautions regarding the AC button: (1) Turning on the AC will not produce heat; the air blown will be the hot air from the radiator. (2) The AC in the car controls the compressor's operation and only provides cooling.

12

2

Share

What is the difference between A+ class sedans and B class sedans?

The differences between A+ class sedans and B class sedans are: 1. Different vehicle types: A+ class sedans are compact sedans; B class sedans are mid-size sedans. 2. Different wheelbases: A+ class sedans generally refer to vehicles with a wheelbase between 2.3 to 2.6m; B class sedans generally refer to vehicles with a wheelbase between 2.6 to 2.8m. 3. Different engine displacements: A+ class sedans refer to vehicles with engine displacements between 1.4 to 2.0L; B class sedans refer to vehicles with engine displacements between 1.6 to 2.5L. Vehicle classification is mainly based on parameters such as wheelbase, displacement, and weight. The further back the letter in the alphabet, the longer the wheelbase, larger the displacement, and greater the weight of the vehicle in that class.

10

4

Share

What does VTEC mean?

VTEC is a valve control system. The following are specific details about VTEC: 1. VTEC stands for "Variable Valve Timing and Lift Electronic Control System" in Chinese. Compared to a regular engine, the VTEC engine differs in the number of cams and rocker arms and their control method. It has two different sets of valve drive cams for low-to-medium speed and high speed, which can be automatically switched via the electronic control system. 2. The working principle of VTEC is: when the engine shifts from low speed to high speed, the computer automatically directs oil pressure to a small turbine inside the intake camshaft drive gear. Under this pressure, the small turbine rotates a certain angle relative to the gear housing, causing the camshaft to rotate forward or backward within a 60-degree range, thereby changing the timing of the intake valve opening to achieve continuous valve adjustment. 3. The VTEC system's alteration of valve timing is still staged, meaning it changes the valve timing only at a certain RPM jump, rather than being continuously variable over a range of RPMs.

16

2

Share

Can ECO Mode Be Used Frequently?

Cars can frequently use ECO mode, also known as economy mode. When driving in congested urban traffic conditions, turning on ECO mode provides good fuel-saving effects. Under ECO mode operation, engine carbon deposits are roughly similar to those produced under normal operating conditions, so ECO mode can be kept on continuously. The main principle of ECO mode is not complicated. It involves comprehensively analyzing and judging factors that affect fuel consumption during vehicle movement, such as automatic transmission gear position, engine speed, vehicle speed, braking, and transmission oil temperature. The ECU control unit calculates the optimal fuel amount to supply the engine, effectively reducing fuel consumption compared to normal driving mode. Simply put, it controls engine speed with appropriate gear selection to minimize unnecessary fuel consumption. ECO is an abbreviation, with Chinese translations being Ecology (environmental protection), Conservation (energy saving), and Optimization (power). ECO mode is further divided into active ECO driving mode and non-active ECO driving mode. When the ECO indicator light on the dashboard illuminates, it indicates that the vehicle's economy mode is activated. ECO mode comes in active and non-active types. The difference lies in the fact that active ECO mode has its own dedicated button, allowing the driver to choose whether to activate it. When the driver presses the ECO mode switch, the dashboard indicator light comes on, and the vehicle automatically adjusts settings such as throttle opening degree, transmission shift logic, and air conditioning output power. Non-active ECO mode doesn't have a dedicated button. When the dashboard ECO indicator light comes on, it merely serves as a reminder function. ECO automatically evaluates your driving behavior. If your current driving operation achieves the optimal fuel supply, the dashboard will simultaneously display the ECO indicator light. Most vehicles use active ECO driving mode, meaning they have their own switch buttons. Therefore, during daily driving, we can turn on ECO mode. However, it's unnecessary to activate ECO mode when driving at speeds exceeding 120 km/h, during idle parking, in N/P gear, or manual mode—especially when climbing hills. Doing so would fail to demonstrate ECO's fuel-saving characteristics and could affect power performance. Additionally, ECO mode typically becomes ineffective under the following circumstances: When the vehicle speed exceeds 120 kilometers per hour, the car prioritizes speed considerations, causing ECO mode to automatically deactivate. During idle parking or when in N/P gear or manual mode, ECO mode may also become ineffective. When high torque output is required, such as when climbing hills, the engine computer prioritizes ensuring sufficient power to drive the vehicle, and ECO mode will not operate in these situations either.

8

1

Share

What are the maintenance cycle items for the BMW 5 Series?

What are the control methods of automotive circuits?

Where is the fuel tank switch of Bestune X40?

What does AC on car air conditioning mean?

What is the difference between A+ class sedans and B class sedans?

What does VTEC mean?

Can ECO Mode Be Used Frequently?

What tires are used on the Volkswagen Lavida?

What are the functions of DSC?

What is the battery model of the Great Wall C50?

What brand are the original tires on the Audi Q5?