What Documents Are Required for Truck Operation?

Should the Changan Yidong use 92 or 95 octane gasoline?

According to the official vehicle manual recommendation, the Changan Yidong should use 92 octane gasoline. In addition to checking the appropriate gasoline grade in the vehicle manual, you can also find it marked on the fuel tank cap of the Changan Yidong. Typically, the gasoline grade can also be determined based on the engine's compression ratio. Vehicles with an engine compression ratio between 8.6-9.9 should use 92 octane gasoline, while those with a compression ratio between 10.0-11.5 should use 95 octane gasoline. However, with the application of some new technologies, the gasoline grade cannot be solely determined by the compression ratio. High compression ratio engines can also be tuned to use lower octane gasoline. This is because, besides the compression ratio, other factors such as ignition timing, turbocharging technology, and Atkinson cycle technology also play a role. Generally, the higher the gasoline grade, the higher the octane number and the better the anti-knock performance. 92 octane gasoline contains 92% isooctane and 8% n-heptane, while 95 octane gasoline contains 95% isooctane and 5% n-heptane. If the Changan Yidong occasionally uses the wrong gasoline grade, simply switch back to the correct grade after consumption. However, long-term use of the wrong gasoline grade can have the following effects: For vehicles recommended to use lower octane gasoline, using a higher octane grade will not cause damage, but the increase in octane number may alter the fuel's ignition point, leading to delayed combustion in the engine. This results in reduced engine power and thermal efficiency, with the practical feedback being poorer performance. For vehicles recommended to use higher octane gasoline, using a lower octane grade can cause engine knocking. Due to the significantly lower octane number, the gasoline's ignition point decreases, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires during the compression stroke, resistance will arise during the upward stroke. This resistance makes the engine run very unstably. If the knocking is imperceptible, it only increases noise without obvious damage to the engine. However, noticeable knocking indicates severe engine conditions, affecting not only driving stability but also causing abnormal wear on pistons and cylinders, and in severe cases, cylinder scoring.

18

2

Share

What does Vellfire ECO mean?

ECO refers to the car's economical driving mode function. ECO is an English abbreviation formed from the words Ecology (environmental protection), Conservation (energy saving), and Optimization (power). The 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 economical mode has been activated. ECO mode is categorized into active and non-active types. The difference lies in the fact that the active type has a dedicated button, allowing the driver to choose whether to activate it. When the driver presses the ECO mode switch, the dashboard indicator light immediately turns on, and the vehicle automatically begins adjusting settings such as throttle opening, transmission shift logic, and air conditioning output power. The non-active ECO mode does not have a dedicated button. When the dashboard ECO indicator light turns on, it serves merely as a reminder function. The ECO system automatically evaluates your driving behavior, and if your current driving operation achieves the optimal fuel supply, the dashboard will simultaneously display the ECO indicator light. Most cars employ the active ECO driving mode, meaning they have a dedicated switch button. Therefore, during daily driving, we can activate the ECO mode. However, it is unnecessary to enable ECO mode when the speed exceeds 120 km/h, during idling, in N/P gear, or in manual mode—especially when climbing a hill. In such scenarios, activating ECO mode would not only fail to demonstrate its fuel-saving characteristics but also negatively impact the vehicle's power performance. Additionally, the ECO mode typically becomes ineffective under the following circumstances: When the vehicle speed exceeds 120 km/h, the system prioritizes speed, causing the ECO mode to deactivate automatically. During idling or when in N/P gear or manual mode, the ECO mode may also become ineffective. When high torque output is required, such as when climbing a hill, the engine control unit prioritizes ensuring sufficient power to drive the vehicle, and the ECO mode will not operate.

15

4

Share

Can 75% Alcohol Be Used Inside the Car?

75% alcohol should not be used directly inside the car. It is recommended to first dilute the 75% alcohol and then use a towel dampened with it to wipe necessary contact points such as the steering wheel and gear lever. Do not apply alcohol to genuine leather seats or decorative leather, as leather contains proteins that can react with alcohol, causing discoloration, deterioration, or hardening of the surface. Additionally, avoid using alcohol on painted interior trim pieces, as alcohol can damage the paint and reduce the gloss of the trim. If the concentration of alcohol in the air reaches a certain level, improper handling may lead to combustion or even explosion if exposed to sparks or during vehicle operation.

11

5

Share

How to Know the Tire Model?

The model and specifications of a tire are generally marked on the tire sidewall, and the information usually includes the tire size, aspect ratio, and tread width. The wider the tread width, the larger the contact area with the ground, which improves the driving feel and stability of the car, but the corresponding fuel consumption will be higher. Tires with a lower aspect ratio have thinner sidewalls, which enhances their ability to receive road feedback. Additionally, tires with a lower aspect ratio provide better lateral support and handling. As one of the important components of a car, tires are responsible for supporting the entire vehicle body and transmitting direction, forming good contact with the ground to ensure safe driving on the road.

19

5

Share

What car is the V logo?

V is the logo of Changan Automobile. Here are some relevant introductions about Changan Automobile: 1. The design inspiration of Changan Automobile's logo comes from abstract sheep horns, symbolizing its leading position in China's automotive industry. 2. Changan Automobile is an integrated automotive company engaged in development, manufacturing, and sales. Its main products include a full range of passenger vehicles, small commercial vehicles, light trucks, minivans, medium and large buses, and a complete series of engines. 3. Changan Automobile's vehicle lineup includes models such as the Changan Eado, Changan CS75, Changan CS55, Changan CS35, Changan CS85, Changan CS95, and Changan CS15, among others.

2

3

Share

What Causes the Rumbling Noise from the Car Chassis?

Car chassis noise is caused by loose engine mounts, steering system failure, or brake system wear. Below are detailed explanations for the above causes: Loose Engine Mounts: The abnormal noise when starting the vehicle is generally a suspension system issue, caused by loose or damaged engine mounts. Steering System Failure: The noise during vehicle steering is due to faults in the steering and suspension systems, as the vehicle's tilt during turning causes deformation in the suspension system. Brake System Wear: The noise when driving on good road conditions is caused by faults in brake system components, such as loose or worn parts, out-of-round brake drums, or uneven brake discs.

14

1

Share

What Documents Are Required for Truck Operation?

Should the Changan Yidong use 92 or 95 octane gasoline?

What does Vellfire ECO mean?

Can 75% Alcohol Be Used Inside the Car?

How to Know the Tire Model?

What car is the V logo?

What Causes the Rumbling Noise from the Car Chassis?

What is the actual fuel consumption of the Beijing BJ30?

What's the reason for the failure of Boyue's automatic window locking?

What Causes the Chassis Noise When Driving a Corolla on Rough Roads?

What are the contents of Subject 3 test?