after top dead center

简明释义

上止点后

英英释义

例句

1.Timing the ignition correctly is crucial for performance after top dead center.

点火时机的准确性对于性能在上止点之后至关重要。

2.We need to adjust the valve timing for optimal efficiency after top dead center.

我们需要调整气门时机，以达到在上止点之后的最佳效率。

3.The compression stroke ends after top dead center.

压缩行程在上止点之后结束。

4.The piston moves downward rapidly after top dead center.

活塞在上止点之后迅速向下移动。

5.The engine starts to produce power after top dead center.

发动机在上止点之后开始产生动力。

作文

In the world of mechanical engineering and automotive design, understanding the concept of engine cycles is crucial. One of the key terms often discussed in this field is after top dead center, which refers to a specific position of the piston within the cylinder of an internal combustion engine. To grasp the significance of this term, one must first comprehend what 'top dead center' (TDC) means. TDC is the point at which the piston reaches its highest position in the cylinder, and it is critical for determining the timing of various engine processes.When the piston moves after top dead center, it begins its downward stroke, allowing for the intake of air-fuel mixture into the combustion chamber. This movement is essential for the engine's power cycle, as it sets the stage for the next phase of combustion. The timing of the piston’s position is vital for optimizing engine performance, fuel efficiency, and reducing emissions. Engineers carefully calculate the exact moment when the piston passes TDC to ensure that the engine operates smoothly and efficiently.Moreover, the term after top dead center is not just relevant for conventional gasoline engines; it is equally important in diesel engines and other types of internal combustion engines. In diesel engines, for instance, the injection of fuel occurs shortly after the piston has passed TDC. This timing is crucial because it influences the combustion process, affecting power output and emissions.Understanding the dynamics of after top dead center can also aid in diagnosing engine problems. For example, if an engine is misfiring or running inefficiently, mechanics may investigate whether the timing of the piston’s movement is correct. If the piston is not reaching TDC or moving properly after TDC, it could indicate issues such as worn piston rings, improper valve timing, or problems with the fuel delivery system.Additionally, the concept of after top dead center extends beyond just the mechanical aspects of the engine. It has implications for performance tuning and modifications. Car enthusiasts often seek to enhance their vehicles' performance by adjusting the timing of the ignition and fuel injection systems in relation to the piston’s position. By optimizing these parameters, they can achieve greater horsepower and torque, leading to a more exhilarating driving experience.In conclusion, the phrase after top dead center encapsulates a fundamental aspect of engine operation that impacts performance, efficiency, and diagnostics. Whether one is designing a new engine, troubleshooting existing problems, or tuning a vehicle for better performance, understanding the significance of the piston’s position relative to TDC is essential. As technology continues to advance, the principles surrounding after top dead center will remain a cornerstone of automotive engineering, ensuring that engines operate at their best for years to come.

在机械工程和汽车设计的世界中，理解发动机循环的概念至关重要。这个领域中常常讨论的一个关键术语是上止点后，它指的是内燃机气缸内活塞的特定位置。要掌握这个术语的重要性，首先必须理解“上止点”（TDC）是什么意思。上止点是活塞达到气缸最高位置的点，它对于确定各种发动机过程的时机至关重要。当活塞在上止点后移动时，它开始向下行程，使空气-燃料混合物进入燃烧室。这一运动对发动机的动力循环至关重要，因为它为下一阶段的燃烧奠定了基础。活塞位置的时机对于优化发动机性能、燃油效率和减少排放至关重要。工程师们仔细计算活塞经过上止点的确切时刻，以确保发动机平稳高效地运行。此外，术语上止点后不仅与传统汽油发动机相关；它在柴油发动机和其他类型的内燃机中同样重要。例如，在柴油发动机中，燃料的注入发生在活塞刚刚超过上止点之后。这一时机至关重要，因为它影响燃烧过程，从而影响功率输出和排放。理解上止点后的动态还可以帮助诊断发动机问题。例如，如果发动机发生失火或运行不正常，维修人员可能会检查活塞的运动时机是否正确。如果活塞没有达到上止点或在上止点后移动不正常，可能表明存在磨损的活塞环、不当的气门时机或燃料供应系统的问题。此外，上止点后的概念不仅限于发动机的机械方面。它对性能调校和改装也有影响。汽车爱好者常常通过调整点火和燃油喷射系统的时机来提高车辆的性能，以适应活塞的位置。通过优化这些参数，他们可以实现更大的马力和扭矩，从而带来更令人兴奋的驾驶体验。总之，短语上止点后概括了发动机操作的一个基本方面，这影响着性能、效率和诊断。无论是设计新发动机、排查现有问题，还是为获得更好的性能而调校车辆，理解活塞相对于上止点的位置的重要性都是必不可少的。随着技术的不断进步，围绕上止点后的原则将继续成为汽车工程的基石，确保发动机在未来几年内保持最佳运行。