编号信息职业技术学院毕业论文题 目卡罗拉发动机排放系统检测与分析学生高强学 号81111126院 系汽车工程系专 业汽车电子技术班 级811111指导老师施海凤 讲师顾问老师二〇一三年十一月摘 要汽车发动机在运行的过程中会排放出大量的污染物，对环境造成危害，发动机排放控制系统就由此产生。但是由于各种零部件的故障导致发动机排放控制系统故障率相对较高，使之不能正常工作。汽车上常见的减少排放污染的装置有：三元催化器、燃油蒸发控制系统、曲轴箱强制通风系统等。其中，三元催化器直接安装在排放管道上，排气中的HC、CO、NOX经过催化反应后生成二氧化碳和水气体排入大气；曲轴箱强制通风系统的工作原理由曲轴箱强制通风阀控制，它可将窜入曲轴箱的废气重新引入气缸燃烧。本文简单介绍了卡罗拉发动机总体结构，工作原理与排放控制系统的概述，重点介绍了卡罗拉发动机排放控制系统的组成、结构原理，详细分析了卡罗拉轿车发动机排放控制系统的检测过程，最后结合具体的故障实例分析了卡罗拉轿车发动机排放控制系统的故障排除。关键词：卡罗拉轿车；发动机排放控制系统；结构原理 AbstractAutomobile engine in the process of running emits large amounts of pollutants, damage to the environment, the resulting engine emission control system. But due to various parts of fault engine emission control system failure rate is relatively high, can't work normally. Common reducing emissions pollution of the device are: three yuan catalysts, fuel evaporation control system, the positive crankcase ventilation system, etc. Among them, three yuan catalysts directly installed on the discharge pipe, the exhaust of HC, CO, NOX after catalytic reaction generates carbon dioxide and water gas discharged into the atmosphere; The positive crankcase ventilation system works by the positive crankcase ventilation valve control, it can be reintroduced to cylinder burn into the crankcase.This article simply introduces the corolla engine overall structure, working principle and an overview of the emission control system, focus on coro...
