after top dead center

简明释义

上死点后在上止点后

英英释义

例句

1.The engine timing must be adjusted to ensure that the piston moves smoothly after top dead center.

发动机的时机必须调整，以确保活塞在上止点后平稳移动。

2.Adjusting the fuel injection timing is crucial after top dead center for better combustion.

调整燃油喷射时机在上止点后对更好的燃烧至关重要。

3.The crankshaft rotates to create power after top dead center during the power stroke.

曲轴在动力冲程中在上止点后旋转以产生动力。

4.The valve opening should occur after top dead center to allow for efficient exhaust.

阀门开启应该在上止点后发生，以便实现高效排气。

5.We need to check the ignition timing after top dead center to optimize performance.

我们需要检查点火时机在上止点后以优化性能。

作文

In the world of internal combustion engines, understanding the various phases of the engine cycle is crucial for both engineers and enthusiasts alike. One of the key terms that often comes up in discussions about engine performance is after top dead center. This phrase refers to a specific point in the engine's cycle, particularly in relation to the position of the piston within the cylinder. To grasp the significance of after top dead center, it is important to first understand what 'top dead center' (TDC) means. TDC is the position of the piston when it is at its highest point in the cylinder, marking the end of the compression stroke and the beginning of the power stroke in a four-stroke engine. When we talk about being after top dead center, we are referring to the moment when the piston has just passed this peak position and is moving downward in the cylinder. This phase is critical because it is during this time that the combustion process occurs, leading to the generation of power that drives the vehicle. The timing of the ignition and the efficiency of the combustion process can greatly influence the performance of the engine. For example, if the ignition occurs too early or too late in relation to the piston’s position, it can lead to knocking, reduced power output, and increased emissions.To optimize engine performance, engineers often use advanced technologies such as variable valve timing and electronic control units to precisely manage the timing of the ignition in relation to the piston’s position. This ensures that the engine operates efficiently and produces maximum power when the piston is after top dead center. Furthermore, understanding this concept is essential for tuning an engine, as enthusiasts often adjust various parameters to achieve the best possible performance. The relationship between the piston position and the timing of the ignition spark is not only important for performance but also for fuel efficiency. When the engine operates in the ideal range of after top dead center, it can burn fuel more completely, leading to better mileage and lower emissions. This is particularly relevant in today's automotive industry, where there is a strong push towards more environmentally friendly vehicles. In summary, the term after top dead center plays a pivotal role in the functioning of internal combustion engines. It signifies a critical point in the engine cycle where the timing of ignition and combustion can significantly affect power output, efficiency, and emissions. As technology continues to advance, understanding and optimizing this phase will remain essential for engineers and car enthusiasts striving for high-performance vehicles. By mastering the intricacies of engine dynamics, including the concept of after top dead center, individuals can contribute to the development of more efficient and powerful engines for the future.

在内燃机的世界中，理解发动机循环的各个阶段对工程师和爱好者来说至关重要。在有关发动机性能的讨论中，一个常常出现的关键术语是上止点后。这个短语指的是发动机循环中的一个特定点，特别是与活塞在气缸内的位置相关。要掌握上止点后的重要性，首先需要了解什么是“上止点”（TDC）。上止点是活塞在气缸中达到最高点的位置，标志着压缩行程的结束和四冲程发动机动力行程的开始。当我们谈论处于上止点后时，我们指的是活塞刚刚越过这个最高位置并向下移动的时刻。这个阶段至关重要，因为在此期间会发生燃烧过程，产生推动汽车的动力。点火的时机和燃烧过程的效率可以极大地影响发动机的性能。例如，如果点火发生得太早或太晚，就可能导致敲击、功率输出减少和排放增加。为了优化发动机性能，工程师们通常使用可变气门正时和电子控制单元等先进技术，精确管理点火时机与活塞位置的关系。这确保了发动机高效运转，并在活塞处于上止点后时产生最大功率。此外，理解这一概念对于调校发动机至关重要，因为爱好者通常会调整各种参数以实现最佳性能。活塞位置与点火火花时机之间的关系不仅对性能重要，而且对燃油效率也至关重要。当发动机在理想的上止点后范围内运转时，可以更完全地燃烧燃料，从而提高里程并降低排放。这在当今汽车工业中尤为相关，因为业界强烈推动更加环保的车辆。总之，术语上止点后在内燃机的功能中发挥着关键作用。它表示发动机循环中的一个关键点，在此点火和燃烧的时机可以显著影响功率输出、效率和排放。随着技术的不断进步，理解和优化这一阶段将继续是工程师和追求高性能车辆的汽车爱好者的必要条件。通过掌握发动机动态的复杂性，包括上止点后的概念，个人可以为未来更高效、更强大的发动机的发展作出贡献。