论文部分内容阅读
汽油直喷燃烧技术(GDI)的应用起源于20世纪30年代,但长期以来没有得以发展,只是到了近两年,由于电子技术和其他系统的性能提高,才使这种新技术有所作为。开发直喷技术的最初想法是由于在大多数的情况下,发动机的空燃比可以调节到比用化学计算法得出的14.7:1更稀薄的状态,而不会对发动机性能造成负面的影响。然而其局限性是稀薄混合气体很难点燃,而且还会随之产生相应的排放物,其主要成分是氮氧化合物(NOx)。
The application of gasoline direct injection combustion technology (GDI) originated in the 1930s but has not been developed for a long time. It is only in the last two years that the new technology has made its mark due to the improved performance of electronic and other systems. The original idea of developing a direct injection technique was that in most cases, the engine’s air-fuel ratio could be adjusted to be thinner than the 14.7: 1 stoichiometrically calculated, without negatively impacting engine performance. However, the limitation is that it is difficult for the lean mixture to ignite, and it also produces corresponding emissions, the main component of which is nitrogen oxides (NOx).