进气冲程

另一次喷射在进气冲程，用于提高点火瞬间火花塞附近混合气质量分数。

The other fuel is injected in the intake stroke , which enhances the gas mixture concentration around the spark plug during ignition .

进气过程中存在流动分层，为改善小负荷时发动机性能，天然气应尽可能在进气冲程中、后期进入气缸；

There is flow lamination phenomenon during the intake stroke , so the natural gas should be injected to the cylinder in the end of intake stroke in order to improve the performance of the engine when the load is small .

配气机构控制着发动机的进气冲程与排气冲程两个工作过程，对发动机的性能特性和可靠性有着直接的影响。

The valve train controls the intake and exhaust strokes of the engine , which has a direct impact on its performance and reliability .

进气冲程缸内形成的流场状态直接影响发动机燃烧过程中火焰的传播速度、燃烧的稳定性以及燃烧是否彻底，进而也影响着发动机的功率。

The flow character in the intake process would affect the spreading velocity of the flame , the stability of the combustion and its combustion efficiency .

缸内平均湍动能强度在进气冲程中总体呈先增大后减小的趋势，压缩冲程中耗散作用使湍动能降低，但挤流作用使气缸中部的湍动能升高；

During the compression stroke the turbulence kinetic energy decreases due to the dissipation effect , while the turbulence kinetic energy in the center of the cylinder increases as a result of the squish effect .

本文分别介绍了自然进气四冲程柴油机和四冲程增压柴油机的改装方案。该方法对单缸四冲程柴油机有一定的适用性。

This paper presents the refit methods for both supercharged and unsupercharged four-stroke diesel engines . It 's applicable to the single cylinder four-stroke diesel engines .

本文讨论汽油喷射与电子控制、动力性、排放、分层进气、二冲程法的关系。并展望汽油喷射发展方向。

This paper discussed the relationship between fuel injection and electronic control , output , emission , stratified induction , two stroke method and looked ahead for its future .