after bottom dead center

简明释义

下死点后;

英英释义

例句

1.Timing adjustments are crucial for efficiency after bottom dead center.

在下止点之后，时机调整对效率至关重要。

2.The fuel injection system activates after bottom dead center for better combustion.

燃油喷射系统在下止点之后激活，以获得更好的燃烧效果。

3.Engine performance improves significantly after bottom dead center due to increased torque.

由于扭矩增加，发动机性能在下止点之后显著改善。

4.The exhaust valves open at the optimal time after bottom dead center.

排气阀在下止点之后的最佳时机打开。

5.The piston begins to accelerate rapidly after bottom dead center.

活塞在下止点之后开始迅速加速。

作文

The concept of engine mechanics is a fascinating subject, especially when we delve into the specific terms that describe the various positions of the engine components. One such term is after bottom dead center, which is crucial in understanding the operation of internal combustion engines. To grasp this concept, we must first understand what 'bottom dead center' means. Bottom dead center (BDC) refers to the lowest point that a piston can reach within a cylinder during its stroke. It is the point where the piston is farthest away from the cylinder head and is critical for the timing of the engine's cycle.When we talk about after bottom dead center, we are referring to the position of the piston immediately following this lowest point. This position is significant because it marks the transition between the downward movement of the piston and the upward movement that leads to compression in the cylinder. In a four-stroke engine, after the piston reaches BDC during the intake stroke, it begins to move up again, compressing the air-fuel mixture that has just entered the cylinder.Understanding this transition is vital for engineers and mechanics as it affects the performance and efficiency of the engine. If the timing of the ignition occurs too early or too late relative to the position of the piston at after bottom dead center, it can lead to inefficient combustion, reduced power output, and increased emissions. Therefore, precise timing is necessary to ensure that the engine operates smoothly and efficiently.In practical applications, the term after bottom dead center is often used in tuning engines for performance. For instance, during the process of adjusting the ignition timing, mechanics will consider the exact moment the piston has moved past BDC to optimize the spark plug firing. This ensures that the air-fuel mixture is ignited at the most effective moment, maximizing the force exerted on the piston and ultimately improving the vehicle's acceleration and overall performance.Moreover, the concept of after bottom dead center is not limited to just ignition timing. It also plays a role in determining the optimal fuel delivery and exhaust timing in various types of engines. By analyzing the behavior of the piston as it moves past BDC, engineers can develop better fuel injection systems that enhance the overall efficiency of the engine.In conclusion, the term after bottom dead center encapsulates a critical aspect of engine function that influences performance and efficiency. An in-depth understanding of this term is essential for anyone involved in automotive engineering or mechanics. As technology continues to evolve, the importance of precise timing and positioning within the engine will only become more pronounced, making the knowledge of terms like after bottom dead center invaluable for future advancements in engine design and functionality.

发动机机械的概念是一个引人入胜的主题，特别是当我们深入探讨描述发动机部件各种位置的特定术语时。其中一个术语是在下止点之后，它对于理解内燃机的操作至关重要。要掌握这一概念，我们必须首先了解“下止点”是什么意思。下止点（BDC）指的是活塞在其行程中可以达到的最低点。这是活塞离气缸头最远的点，对于发动机循环的时机至关重要。当我们谈论在下止点之后时，我们指的是活塞在达到这个最低点后立即的位置。这个位置很重要，因为它标志着活塞向下运动与即将导致气缸内压缩的向上运动之间的过渡。在四冲程发动机中，活塞在进气行程中达到BDC后，便开始向上移动，压缩刚进入气缸的空气-燃料混合物。理解这一过渡对工程师和机械师至关重要，因为它影响发动机的性能和效率。如果点火时机相对于活塞在在下止点之后的位置发生得太早或太晚，可能会导致燃烧效率低下、功率输出减少和排放增加。因此，精确的时机是必要的，以确保发动机平稳高效地运行。在实际应用中，术语在下止点之后常用于调整发动机性能。例如，在调整点火时机的过程中，机械师会考虑活塞在BDC之后移动的确切时刻，以优化火花塞的点火。这确保了空气-燃料混合物在最有效的时刻被点燃，从而最大限度地提高施加在活塞上的力量，最终改善车辆的加速和整体性能。此外，在下止点之后的概念不仅限于点火时机。它还在确定各种类型发动机的最佳燃油供应和排气时机方面发挥作用。通过分析活塞在超过BDC时的行为，工程师可以开发出更好的燃油喷射系统，增强发动机的整体效率。总之，术语在下止点之后概括了影响性能和效率的发动机功能的一个关键方面。对这个术语的深入理解对任何参与汽车工程或机械的人来说都是必不可少的。随着技术的不断发展，发动机内部精确时机和位置的重要性只会变得更加明显，使得像在下止点之后这样的术语的知识对未来发动机设计和功能的进步变得不可或缺。