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Seminar On Stratified Charge Engine Report Download

什么是分层电荷引擎？

The stratified charge engine is a type of internal-combustion engine which runs on gasoline. It is very much similar to the Diesel cycle. The name refers to the layering of the charge inside the cylinder. The stratified charge engine is designed to reduce the emissions from the engine cylinder without the use of exhaust gas recirculation systems, which is also known as the EGR or catalytic converters.

分层电荷燃烧发动机利用一种分发燃料的方法，该燃料连续地在燃烧室内构建了燃料层。燃料的初始电荷直接注入燃烧室的小集中区域，并在其中快速点燃。随着燃烧过程的继续，它可以穿过活塞的顶部到达腔室的瘦肉区域，在该区域，较冷的温度降低了有害NOX排放的形成。随后可以引入额外的少量燃料注射，以传播火焰前端并管理活塞敲击。这种布置在缓慢的恒定速度应用中效果很好，但是事实证明，在汽车用途中产生的速度和负载范围很难管理。

例子：

Honda has used a stratified charge design in many of its “lean burn” Civic models.

PRINCIPLE:-

分层电荷发动机的原理是提供足够丰富的混合物，可以在火花塞的附近以及在其余的气缸附近燃烧，这是一种非常瘦的混合物，燃油含量如此之低，以至于无法使用它在传统引擎中。在具有分层电荷的发动机上，传递的功率不再由接收空气的数量控制，而是由注射汽油的数量（如柴油发动机）控制。

HOW DOES IT WORK?

一种方法是将燃烧室分开，以创建火花塞所在的预燃烧室。活塞的头也经过修改。它包含一个球体腔，在压缩过程中将圆柱体所包含的空气散发出旋转的运动。结果，在注射过程中，燃料仅在火花塞附近喷洒。但是其他策略是可能的。例如，还可以利用入学电路的形状并使用工理，例如“旋转”阶段，从而在其水平上产生湍流。在分层模式下，发动机操作的所有微妙都发生在注射水平。这包括两种主要模式：一个精益模式，对应于非常低的发动机负载下的操作，因此，当它以较少的调用以及“正常”模式时，它以充分充电并提供最大功率时。在第一种模式下，注射发生在压缩冲程的末端。由于活塞腔产生的漩涡效果，喷油器喷洒的燃料被限制在火花塞附近。 As there is very high pressure in the cylinder at this moment, the injector spray is also quite concentrated. The “directivity” of the spray encourages even greater concentration of the mixture. A very small quantity of fuel is thus enough to obtain optimum mixture richness in the zone close to the spark plug, whereas the remainder of the cylinder contains only very lean mixture.

priniple working of Stratified Charge Engine

气缸的空气意味着th的分层at even with partial charge it is also possible to obtain a core of mixture surrounded by layers of air and residual gases which limit the transfer of heat to the cylinder walls. This drop in temperature causes the quantity of air in the cylinder to increase by reducing its dilation, delivering the engine additional power. When idling, this process makes it possible to reduce consumption by almost 40% compared to a traditional engine. And this is not the only gain. Functioning with stratified charge also makes it possible to lower the temperature at which the fuel is sprayed. All this leads to a reduction in fuel consumption which is of course reflected by a reduction of engine exhaust emissions. When engine power is required, injection takes place in normal mode, during the admission phase. This makes it possible to achieve a homogeneous mix, as it is the case with traditional injection. Here, contrary to the previous example, when the injection takes place, the pressure in the cylinder is still low. The spray of fuel from the injector is therefore highly divergent, which encourages a homogeneous mix to form.