Cotton (HS code ) trade insights

List of contents of this article:

• 1, The quality of the car engine, what kind is good
• 2, Engine review, should be complete
• 3, What is the worse engine of domestic cars than that of foreign engines?
• 4, How is the power-mass ratio of the engine calculated?

The quality of the car engine, what kind is good

1. Look at the material, the material of the engine can play a great role. Generally, the density of aluminum is relatively small, if It must be relatively light to make an engine with it, and it can exert as much power as possible. And it can also withstand high temperatures and has good ventilation.

2. Which car engine is the most durable: 1. Among the top ten Honda, Japanese cars occupy four seats, which shows the advantage of Japanese cars in terms of engines. But Honda is the best engine. Honda's engine technology is second to none among major automobile companies. Among them, there are the VTEC system, the VTEC system and the later &ldquo Earth Dream&rdquo series.

3. Secondly, after the engine is started, observe the stability of the engine operation. If the rotation speed is stable, the fluctuation is small, the vibration is not obvious, and there is no abnormal sound, it means that the operation of the engine is stable. Then observe the exhaust part of the engine, mainly to observe the color and taste of the exhaust.

startMachine review, it should be complete

1. The larger the value, the stronger the potential of the engine to overcome resistance without changing gears.

2. "Automotive Engine Structure" review question class name student number fill in the blanks The overall structure of the automobile is usually composed of four major parts: engine, chassis, body and electrical equipment. Nowadays, most cars use four-stroke engines, that is, each working cycle has to go through four piston strokes: intake, compression, work and exhaust.

3 、. There are Cotton (HS code ) trade insightsalso other types of internal combustion engines, such as diesel engines and gas turbines, each with its own advantages and disadvantages. Two. There is also an external combustion engine. The steam engines used in early trains and ships were typical external combustion engines.

4. Draw a relatively familiar engine gas distribution phase diagram, which is explained in the figure: 1) The crankshaft angle relative to the opening time of the inlet and exhaust valves;2) What is the crankshaft angle of the opening and closing lag angle of the inlet and exhaust valves respectively; 3) What is the crankshaft angle of the valve overlap angle; 4) What are the rules of the opening and closing times of the valve relative to the upper and lower stop points?

5. You can also read some reference materials during after-class review. Reference materials should be selected, not too many. It is best to choose one for each subject. Reading reference materials should be synchronized with classroom learning, that is, focusing on the content of the teacher's lecture center or what you don't understand.

What is the worse engine of domestic cars than that of foreign engines?

There should be no big difference in performance between imitation domestic engines produced in large quantities and foreign engines. Basically, CNC processing technology and semi-automated assembly technology are adopted.

At the manufacturing level, the engines we produce are still very different from the original imported engines from abroad, which is mainly reflected in production line construction, machining, casting level, size control, etc.

First, I always feel that opening a domestic independent brand is worse than a joint venture brand. The second important reason is that I feel that there is still a big gap between independent brands and joint venture brands. At present, there is indeed a gap. These gaps are mainly manifested in the "three major parts" of the car, engine, gearbox and chassis.

How is the power-mass ratio of the engine calculated?

1. Calculation formula: the specific power is equal to the maximum net power of the engine divided by the total mass of the car. Relative power is a measure.A comprehensive indicator of automobile power performance, specifically refers to the ratio of the maximum power of the automobile engine to the total mass of the automobile. Generally speaking, for the same type of car, the greater the specific power, the better the power of the car.

2. That is, specific power (Kw/Kg or Kw/T): Estimated formula: maximum total mass*0.9/total mass Accurate calculation formula: maximum net power/total mass Specific power is a comprehensive indicator to measure the power performance of the automobile, specifically refers to the maximum power of the automobile engine and the total The ratio of quality (see the corresponding explanation for the concepts of the above two words).

3. Ratio power (kW/kg or kw/T) calculation formula: maximum net power of the engine/total mass of the car. Classification of automobile engines: According to the different power sources, automobile engines can be divided into diesel engines, gasoline engines, electric vehicle motors and hybrid engines, etc.

4. Engine power is one of the important indicators to measure the output capacity of the engine. It indicates the amount of energy that the engine can output per second.

5. If the German horsepower measurement is the power transmitted to the wheels, then the power output of the same engine used on different models should be different. Try to compare bmw330 and bmw530, and their power is 225hp\/5900rpm; Conclusion, Either BMW falsies the data, or it measures the net output value of the engine.