valve timing

简明释义

阀定时

英英释义

例句

1.Incorrect valve timing can lead to engine knocking.

不正确的气门时机可能导致发动机敲击声。

2.The engineer adjusted the valve timing to improve engine performance.

工程师调整了气门时机以提高发动机性能。

3.Adjusting the valve timing can help optimize fuel efficiency.

调整气门时机可以帮助优化燃油效率。

4.Many high-performance cars use variable valve timing systems.

许多高性能汽车使用可变气门时机系统。

5.The mechanic explained how valve timing affects power output.

机械师解释了气门时机如何影响功率输出。

作文

In the world of automotive engineering, one of the most crucial aspects that determines the performance and efficiency of an engine is its valve timing. This term refers to the precise timing of the opening and closing of the engine's valves, which are responsible for allowing air and fuel into the combustion chamber and expelling exhaust gases. Properly adjusted valve timing can significantly enhance an engine's power output, fuel efficiency, and overall reliability.To understand the importance of valve timing, it is essential to first grasp how an internal combustion engine operates. An engine works on a four-stroke cycle: intake, compression, power, and exhaust. During the intake stroke, the intake valve opens, allowing a mixture of air and fuel to enter the combustion chamber. The timing of this event is critical; if the valve opens too late or closes too early, the engine may not receive enough fuel and air, leading to suboptimal combustion and reduced power.Similarly, during the exhaust stroke, the exhaust valve must open at the right moment to allow the spent gases to exit the cylinder. If the valve timing is off, the engine may experience back pressure, which can hinder performance and increase emissions. Therefore, engineers spend significant time and resources fine-tuning valve timing to achieve the best possible engine performance.Modern engines often utilize advanced technologies such as Variable Valve Timing (VVT) systems to optimize valve timing across different RPM ranges. VVT allows the engine to adjust the timing of the valves dynamically, depending on the speed and load conditions. This means that at lower RPMs, the engine can optimize fuel efficiency, while at higher RPMs, it can maximize power output. Such innovations have made it possible for manufacturers to produce engines that are both powerful and economical, meeting the demands of today’s environmentally conscious consumers.Moreover, improper valve timing can lead to severe engine issues. For instance, if the timing is too advanced or retarded, it can cause engine knocking or misfires, which not only affect performance but can also lead to long-term damage. Regular maintenance and checks are essential to ensure that the valve timing remains within the manufacturer's specifications, preventing costly repairs down the line.In conclusion, valve timing is a fundamental aspect of engine design and operation that directly impacts performance and efficiency. As technology continues to evolve, understanding and optimizing valve timing will remain a vital focus for engineers and manufacturers alike. By investing in research and development, the automotive industry can continue to push the boundaries of what is possible, creating engines that are more powerful, efficient, and environmentally friendly than ever before.

在汽车工程的世界中，决定发动机性能和效率的最关键方面之一是它的阀门时机。这个术语指的是发动机阀门开启和关闭的精确时机，这些阀门负责允许空气和燃料进入燃烧室并排出废气。适当调整的阀门时机可以显著提高发动机的功率输出、燃油效率和整体可靠性。要理解阀门时机的重要性，首先必须了解内燃机的工作原理。发动机在四冲程循环中工作：进气、压缩、动力和排气。在进气冲程中，进气阀打开，允许空气和燃料的混合物进入燃烧室。这个事件的时机至关重要；如果阀门打开得太晚或关闭得太早，发动机可能无法获得足够的燃料和空气，从而导致燃烧不充分，功率降低。同样，在排气冲程中，排气阀必须在正确的时刻打开，以允许废气离开气缸。如果阀门时机不对，发动机可能会经历背压，这会妨碍性能并增加排放。因此，工程师们花费大量时间和资源来微调阀门时机，以实现最佳的发动机性能。现代发动机通常采用先进的技术，如可变阀门时机（VVT）系统，以优化不同转速范围内的阀门时机。VVT允许发动机根据速度和负载条件动态调整阀门的时机。这意味着在较低转速下，发动机可以优化燃油效率，而在较高转速下，它可以最大化功率输出。这些创新使制造商能够生产出既强大又经济的发动机，满足当今环保意识消费者的需求。此外，不当的阀门时机可能导致严重的发动机问题。例如，如果时机过早或过晚，可能会导致发动机敲击或失火，这不仅影响性能，还可能导致长期损坏。定期维护和检查对确保阀门时机保持在制造商规格范围内至关重要，从而防止后续昂贵的修理。总之，阀门时机是发动机设计和运行中的一个基本方面，直接影响性能和效率。随着技术的不断发展，理解和优化阀门时机将始终是工程师和制造商的重要焦点。通过投资于研发，汽车行业可以继续推动可能性的边界，创造出比以往更强大、更高效、对环境更友好的发动机。