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这是一篇在第十四届国际内燃机会议上发表的论文,其主要内容是探讨显著改善柴油机 的低温起动性能(其中包括起动性、预热性及白烟、臭气的排出等)的新方法。 众所周知,影响着火性能的因素中,最重要的是压缩终了温度,而压缩终了温度又取 决于压缩前的温度及压缩比。由图1可知,只要略微提高压缩前的温度,着火性能就显著改 善。不难看出,对一般低压缩比的增压发动机来说,低温起动性能问题就显得更为突出。 本文所介绍的新的起动方法是:在排气凸轮上另外再设置一只小凸轮(称为二次排气 凸轮),在进气行程下止点附近,用以急速开闭排气阀,由于进气节流,使排气系统与气缸
This is a paper published at the 14th International ICE Conference. Its main content is to explore new ways to significantly improve the low-temperature starting performance of diesel engines, including start-up, preheating and white smoke, odor emission, etc. method. It is well known that the most important factor affecting the fire performance is the compression end temperature, which in turn depends on the temperature and compression ratio before compression. As can be seen from Fig. 1, the ignition performance is significantly improved as long as the temperature before compression is slightly increased. It is not difficult to see that for the general low compression ratio supercharged engine, low temperature starting performance problems become more prominent. The new starting method introduced in this paper is to set another small cam (called secondary exhaust cam) on the exhaust cam, which is used to quickly open and close the exhaust valve near the bottom dead center of the intake stroke, Exhaust system and cylinder due to throttle throttling