1. 前言我们以中型轿车用的直喷式柴油机为基础,研究开发出了两种以甲醇为燃料的大型车用直喷式发动机。其中之一,是将甲醇直接喷入气缸内,用火花塞点火的缸内喷射式火花点火发动机。该机虽然改变了原柴油机的燃料和燃烧系统,但其机械结构和原柴油机几乎相同。因此,除燃料和燃烧系统外,开发的课题较少。 1. Introduction We based on the direct injection diesel engine for midsize sedan, developed and researched two kinds of direct injection engine for large vehicles that use methanol as fuel. One of them is the injection of methanol directly into the cylinder, spark ignition spark ignition cylinder spark ignition engine. Although the aircraft changed the original diesel fuel and combustion system, but its mechanical structure and the original diesel engine is almost the same. Therefore, in addition to fuel and combustion systems, less developed topics.