乘用车发动机结构与参数特征

通过对世界上现有产品进行统计分析,阐述了车长与发动机排量、发动机缸径尺寸与排量、发动机缸径尺寸与发动机结构形式、发动机行程与缸径、发动机压缩比和发动机排量的统计关系。简述了凸轮轴与气门的布置特征。指出,对于任何结构型式的发动机,采用双顶置凸轮轴的布置特征占绝对优势;多点气道喷射发动机是现在市场车型的主流,但直喷加增压是技术发展方向。概述了发动机的性能特征及目前水平。

Structural and Parameters Characteristic of Passenger Car Engines

Based on the statistic analysis of the current products in the world,the statistic relation between vehicle length and engine displacement,cylinder bore size and displacement,cylinder bore size and engine structure,engine stroke and cylinder bore,compression ratio and engine displacement.The arrangement characteristic of camshaft and valve is outline.It is indicated in the paper that the layout of double overhead camshaft enjoys absolutely advantage for engine with any structural style;multi-point port inject engine is the main engine for vehicle models on the current market,however direction injection and supercharging is the future development trend.Engine performance feature and the current level are introduced in the paper.