four cycle engine

简明释义

四冲程发动机

英英释义

例句

1.Many motorcycles use a four cycle engine for better fuel efficiency.

许多摩托车使用四冲程发动机以提高燃油效率。

2.In a small boat, a four cycle engine provides reliable power for cruising.

在小船上，四冲程发动机提供可靠的巡航动力。

3.The car is powered by a four cycle engine.

这辆车由一个四冲程发动机驱动。

4.The mechanic explained how to maintain a four cycle engine properly.

机械师解释了如何正确维护四冲程发动机。

5.The four cycle engine operates on a four-stroke cycle: intake, compression, power, and exhaust.

四冲程发动机在进气、压缩、做功和排气四个冲程中运行。

作文

The invention of the internal combustion engine revolutionized transportation and machinery, but it was the development of the four cycle engine that truly transformed the automotive industry. A four cycle engine (四冲程发动机) operates through a series of four distinct strokes: intake, compression, power, and exhaust. Each stroke plays a crucial role in the engine's overall function, contributing to its efficiency and performance. During the intake stroke, the engine draws in a mixture of air and fuel through the open intake valve. This mixture is essential for the combustion process that follows. The second stroke, compression, involves the piston moving upward, compressing the air-fuel mixture within the cylinder. This compression is vital as it increases the temperature and pressure of the mixture, making it more combustible. The third stroke, known as the power stroke, is where the magic happens. As the piston reaches the top of its travel, a spark from the spark plug ignites the compressed mixture, causing a rapid expansion of gases. This explosion forces the piston downward with significant force, generating the power needed to turn the engine's crankshaft. Finally, during the exhaust stroke, the piston moves back up, pushing out the spent gases through the open exhaust valve. This cycle then repeats, allowing the engine to produce continuous power. The design of the four cycle engine has led to numerous advancements in automotive technology. For instance, many modern vehicles utilize fuel injection systems that optimize the air-fuel mixture for better performance and reduced emissions. Additionally, advancements in materials and engineering have made four cycle engines more durable and efficient than ever before. One of the key advantages of the four cycle engine is its efficiency. Compared to two-cycle engines, which complete a power cycle in just two strokes, the four cycle engine allows for more complete combustion of the fuel. This results in higher fuel efficiency and lower emissions, making it a preferred choice for many automotive manufacturers. Moreover, the four cycle engine tends to have a longer lifespan due to its design, which reduces wear and tear on components. However, the four cycle engine is not without its challenges. The complexity of its design means that it requires more components, leading to increased maintenance needs. Additionally, while it is generally more efficient than its two-cycle counterpart, it can still produce significant emissions, necessitating ongoing efforts to improve its environmental impact. In conclusion, the four cycle engine (四冲程发动机) has played a pivotal role in shaping modern transportation. Its four-stroke cycle allows for efficient power generation, which has enabled the development of powerful and reliable vehicles. As technology continues to advance, the four cycle engine will likely evolve further, incorporating new innovations that enhance its performance and reduce its environmental footprint. Understanding the mechanics and significance of the four cycle engine is essential for anyone interested in automotive technology and engineering.