preignition

简明释义

英[ˌpriːɪɡˈnɪʃən]美[ˌpriɪɡˈnɪʃən]

n. 提前点火；早点火

英英释义

单词用法

同义词

反义词

例句

1.A few sentences regarding preignition and detonation may be helpful.

再说几句有关早燃和爆燃的问题，或许是有益处的。

2.This paper describes a system for preignition in motorcycle engine using spark plus as a detecting probe, the author carries out researches on a method how the ionic current comes into being.

本文描述了一种直接利用火花塞电极作为传感器检测南方摩托车发动机早燃的方法，作者在文章中详细分析及讨论了离子电流的产生机理。

3.This paper describes a system for preignition in motorcycle engine using spark plus as a detecting probe, the author carries out researches on a method how the ionic current comes into being.

本文描述了一种直接利用火花塞电极作为传感器检测南方摩托车发动机早燃的方法，作者在文章中详细分析及讨论了离子电流的产生机理。

4.A few sentences regarding preignition and detonation may be helpful.

再说几句有关早燃和爆燃的问题。

5.This paper introduces a new power supply of preignition for pulse xenon lamp.

本文介绍了一种新型的脉冲氙灯预燃电源，它利用三端开关电源模块构成其主电路。

6.The car's manual included a section on preignition 预点火 and how to identify its symptoms.

汽车手册中包括了关于预点火 preignition 及其症状识别的部分。

7.During the test drive, the driver noticed signs of preignition 预点火 when the engine started to knock.

在试驾过程中，司机注意到发动机开始敲击时有预点火 preignition 的迹象。

8.To prevent preignition 预点火, it's essential to use high-quality fuel in high-performance vehicles.

为了防止预点火 preignition，在高性能车辆中使用高质量燃料是至关重要的。

9.The mechanic explained that preignition 预点火 can cause severe engine damage if not addressed promptly.

机械师解释说，预点火 preignition 如果不及时处理，可能会导致严重的发动机损坏。

10.Engine tuning is critical to avoid preignition 预点火 in turbocharged engines.

发动机调校对于避免涡轮增压发动机中的预点火 preignition 至关重要。

作文

In the world of automotive engineering, the term preignition refers to a phenomenon that occurs when the air-fuel mixture in an engine cylinder ignites before the spark plug fires. This premature ignition can lead to a variety of problems, including engine knocking, reduced performance, and even severe engine damage. Understanding preignition is crucial for both engineers and car enthusiasts alike, as it can significantly impact the longevity and efficiency of an engine.To grasp the concept of preignition, one must first understand how a typical internal combustion engine operates. In a standard gasoline engine, a mixture of air and fuel is drawn into the cylinder during the intake stroke. Once the piston reaches the top of its stroke, the spark plug generates a spark that ignites the compressed air-fuel mixture, causing an explosion that drives the piston down and produces power. However, if the mixture ignites too early—before the spark plug fires—this is known as preignition.There are several factors that can contribute to preignition. One common cause is excessive heat in the combustion chamber, which can be generated by high compression ratios or hot spots on the piston or cylinder head. Additionally, using low-octane fuel in a high-performance engine can increase the likelihood of preignition, as lower-octane fuels ignite more easily under pressure. Other contributing factors include improper ignition timing, carbon buildup in the combustion chamber, and high operating temperatures.The effects of preignition can be detrimental to an engine's health. When preignition occurs, it can lead to knocking, which is a loud, rattling noise that indicates the engine is running inefficiently. Knocking not only reduces performance but can also result in serious damage to engine components over time. In extreme cases, preignition can cause catastrophic failure, leading to costly repairs or even the need for a complete engine replacement.Preventing preignition is essential for maintaining engine performance and longevity. One effective strategy is to ensure that the correct fuel grade is used for the specific engine. High-performance engines typically require higher-octane fuel to prevent preignition. Additionally, regular maintenance, such as cleaning carbon deposits and checking ignition timing, can help mitigate the risk of preignition.Moreover, advancements in engine design have also contributed to reducing the incidence of preignition. Many modern engines are equipped with sophisticated sensors and computer-controlled systems that optimize ignition timing and fuel delivery, helping to prevent premature ignition. These technologies not only enhance performance but also improve fuel efficiency and reduce emissions.In conclusion, understanding preignition is vital for anyone involved in automotive engineering or maintenance. By recognizing the causes and effects of preignition, individuals can take proactive measures to prevent it, ensuring their engines run smoothly and efficiently. As technology continues to evolve, the ability to manage preignition will likely improve, leading to better-performing and more reliable vehicles for everyone. The importance of education and awareness regarding preignition cannot be overstated, as it plays a significant role in the overall performance and reliability of modern engines.

在汽车工程领域，术语preignition指的是当发动机气缸中的空气-燃料混合物在火花塞点火之前就点燃的现象。这种提前点燃可能导致多种问题，包括发动机敲击、性能下降，甚至严重的发动机损坏。理解preignition对工程师和汽车爱好者来说至关重要，因为它会显著影响发动机的耐用性和效率。要掌握preignition的概念，首先必须了解典型内燃机的工作原理。在标准汽油发动机中，空气和燃料的混合物在进气行程中被吸入气缸。当活塞到达行程顶端时，火花塞产生火花点燃压缩的空气-燃料混合物，导致爆炸驱动活塞向下并产生动力。然而，如果混合物过早点燃——在火花塞点火之前——这就被称为preignition。导致preignitionpreignition的可能性，因为低辛烷值燃料在压力下更容易点燃。其他因素还包括点火时机不当、燃烧室内的碳积聚以及高工作温度。preignition的影响可能对发动机健康造成危害。当发生preignition时，可能会导致敲击声，这是一种响亮的、撞击的噪音，表明发动机运行不正常。敲击不仅降低了性能，还可能随着时间的推移对发动机部件造成严重损害。在极端情况下，preignition可能导致灾难性故障，导致昂贵的维修费用甚至需要完全更换发动机。防止preignition对于保持发动机性能和耐用性至关重要。一种有效的策略是确保为特定发动机使用正确的燃料等级。高性能发动机通常需要更高辛烷值的燃料以防止preignition。此外，定期维护，如清洁碳沉积物和检查点火时机，可以帮助降低preignition的风险。此外，发动机设计的进步也有助于减少preignition的发生。许多现代发动机配备了复杂的传感器和计算机控制系统，优化点火时机和燃料供给，帮助防止提前点燃。这些技术不仅提升了性能，还改善了燃油效率并减少了排放。总之，理解preignition对于任何参与汽车工程或维护的人来说都至关重要。通过认识preignition的原因和影响，个人可以采取主动措施来防止它，确保他们的发动机平稳高效地运行。随着技术的不断发展，管理preignition的能力也将得到改善，从而为每个人提供性能更好、更加可靠的车辆。教育和提高对preignition的认识的重要性不容小觑，因为它在现代发动机的整体性能和可靠性中发挥着重要作用。