after top dead center

简明释义

上止点后上死点后在上止点后

英英释义

例句

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

点火时机对于性能在上止点后至关重要。

2.The crankshaft rotates freely after top dead center.

曲轴在上止点后自由旋转。

3.The engine begins to produce power after top dead center.

发动机在上止点后开始产生动力。

4.Fuel injection should occur just after top dead center for optimal combustion.

为了最佳燃烧，喷油应在上止点后进行。

5.The piston moves down the cylinder after top dead center.

活塞在缸内向下移动上止点后。

作文

Understanding the concept of engine mechanics is crucial for anyone interested in automotive engineering or simply looking to enhance their knowledge about how vehicles operate. One important term in this field is after top dead center, which refers to a specific position of the piston within an internal combustion engine. To grasp this concept fully, we need to break it down into simpler terms and explore its significance in engine performance.The term after top dead center (ATDC) describes the position of the piston after it has reached its highest point in the cylinder, known as the top dead center (TDC). At TDC, the piston is at its maximum height, and the combustion chamber is at its smallest volume. This position is critical because it is where the air-fuel mixture is compressed before ignition occurs. Once the piston moves past this point, it begins its downward stroke, which is where the power stroke of the engine happens.In practical terms, understanding when the piston is after top dead center is essential for tuning the engine for optimal performance. For instance, in a four-stroke engine, the timing of the ignition spark must be carefully calibrated to ensure that the spark plug ignites the fuel-air mixture at the right moment. If the spark occurs too early, before the piston reaches TDC, it can lead to pre-ignition and knocking, which are detrimental to engine health. Conversely, if the spark occurs too late, after the piston has passed TDC, it can result in reduced power output and efficiency.Engineers often use various tools and methods to measure the exact moment when the piston is after top dead center. This precision is vital for performance tuning, as it influences the overall efficiency and power output of the engine. For example, in performance engines, adjustments may be made to the ignition timing to optimize the power band, ensuring that the engine delivers maximum power throughout its operational range.Moreover, the concept of after top dead center extends beyond just ignition timing. It also plays a significant role in understanding valve timing and lift. In an engine, valves open and close at specific intervals during the four-stroke cycle. Knowing when the piston is ATDC helps engineers determine the ideal timing for the intake and exhaust valves to open and close, which directly affects the engine's breathing capabilities and overall performance.In conclusion, the term after top dead center is more than just a technical jargon; it represents a fundamental aspect of engine operation that influences everything from ignition timing to valve operation. For those delving into automotive engineering, mastering this concept is essential. It not only aids in understanding how engines work but also enhances one’s ability to troubleshoot and optimize engine performance effectively. As technology advances, the importance of precision in engine mechanics will only continue to grow, making knowledge of terms like after top dead center invaluable for future engineers and enthusiasts alike.

理解发动机机械的概念对于任何对汽车工程感兴趣的人或仅仅想增强对车辆运作知识的人来说都是至关重要的。在这个领域中，一个重要的术语是上止点后，它指的是活塞在内燃机中的特定位置。要完全掌握这个概念，我们需要将其分解为更简单的术语，并探讨其在发动机性能中的重要性。术语上止点后（ATDC）描述了活塞在达到气缸最高点，即上止点（TDC）之后的位置。在上止点时，活塞处于最大高度，燃烧室的体积最小。这个位置至关重要，因为它是空气-燃料混合物在点火发生之前被压缩的地方。一旦活塞越过这个点，它就开始向下行程，这是发动机的动力冲程发生的地方。从实际角度来看，了解活塞何时处于上止点后对于调校发动机以实现最佳性能至关重要。例如，在四冲程发动机中，点火火花的时机必须仔细校准，以确保火花塞在正确的时刻点燃燃料-空气混合物。如果火花发生得太早，在活塞达到TDC之前，就会导致提前点火和爆震，这对发动机健康有害。相反，如果火花发生得太晚，在活塞经过TDC之后，就会导致功率输出和效率降低。工程师通常使用各种工具和方法来测量活塞何时确切处于上止点后。这种精确性对于性能调校至关重要，因为它影响发动机的整体效率和功率输出。例如，在性能发动机中，可能会对点火时机进行调整，以优化功率带，确保发动机在其工作范围内提供最大功率。此外，上止点后的概念不仅限于点火时机。它在理解阀门时机和升程方面也发挥着重要作用。在发动机中，阀门在四冲程循环期间按特定间隔打开和关闭。知道活塞何时处于ATDC有助于工程师确定进气和排气阀理想的开启和关闭时机，这直接影响发动机的呼吸能力和整体性能。总之，术语上止点后不仅仅是技术术语；它代表了影响从点火时机到阀门操作的发动机运作的基本方面。对于那些深入研究汽车工程的人来说，掌握这一概念至关重要。它不仅有助于理解发动机的工作原理，还增强了有效排除故障和优化发动机性能的能力。随着技术的进步，发动机机械精度的重要性只会继续增长，使得像上止点后这样的术语对未来的工程师和爱好者来说都变得无价。