基于离子电流为信号源的发动机燃烧诊断的基础研究

项目名称： 基于离子电流为信号源的发动机燃烧诊断的基础研究

项目编号： No.51306143

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 能源与动力工程

项目作者： 高忠权

作者单位： 西安交通大学

项目金额： 26万元

中文摘要： 离子电流法是一种新型的在线测量技术，相比于传统的压力传感器、激光法等，由于其具有结构简单、价格低廉、响应性能好等优点，现已成为发动机电控领域的研究热点。目前，离子电流法应用于电控系统的"瓶颈"问题是：离子电流的主导因素与获取燃烧信息的原理不明确。本项目将研究：1)分析定容燃烧装置中不同比例的CH4/CO/H2混合气燃烧过程中产生的离子电流变化规律，采用CHEMKIN化学反应动力学软件计算燃烧中间产物的浓度分布，从化学反应元素源头推导主导离子电流的离子化反应种类，提炼通过离子电流提取燃烧与排放信息的原理；2）在发动机汽缸垫上布置多个电极，根据各电极测得的离子电流提取压力、火焰传播以及发动机运转工况等信息，并结合神经网络算法预测缸内燃烧状态，阐明离子电流测量非正常燃烧的机理。本项目研究所得的数据可以用于指导开发基于离子电流为信号源的新型发动机电控系统，具有重要的科学意义与工程价值。

中文关键词： 离子电流；火焰速度；焰后区；在线测量；发动机

英文摘要： Ion current measurement is a neotype on-line survey method for SI (spark ignition) engine. Due to its low cost, simple structure, no modification to engine and excellent response performance,ion current diagnostics is proved an effective approach and much effort has been devoted to it. Currently, the main problem of ion current method is that the dominant factors and the principle of detection for combustion information are ambiguous.This proposed work involves two aspects but related research work: 1) Componet effect of synthesis gas (CH4/CO/H2) on the ion curent will be investigated. Multiple ion current sensors are designed and located at different positions in a constant combustion bomb, ion current generated during combustion of pre-mixture will be detected. This aspect aims to find the dominant ionization process of ion current, and confirm the contributing proportion of chemical ionization reaction and thermal ionization reaction.Concentration of component related to the charged particles will be calculated with CHEMKIN software to analyze generation mechanism of ion current. Ion current obtained with different electrodes will be compared to find the optimized location of ion sensor for combustion detection. Additionally, a multiple ignition system will be designed to the simulate of abnormal combusti

英文关键词： Ion current；Fame speed；Post-flame；on-line survey；Internal combustion engine