【作者】 刘军；

【导师】 苏清祖；

【作者基本信息】 江苏大学 ， 车辆工程， 2002， 博士

【摘要】 本文研究汽车排放污染物的控制技术，在发动机与整车匹配技术、汽车发动机排气性质、汽车排气后处理装置工作过程等方面开展了深入的研究。为汽车排放污染物控制技术提供了较好的理论和试验研究基础。 在发动机与汽车的匹配技术方面，建立了以汽车运行工况循环为基础的汽车排放性能和经济性能预测模型。实现以排放为目标的整车、传动系、发动机等的匹配和优化。开发了汽车动力学分析软件，具有汽车排放性能分析功能。 在汽车发动机排气性质研究中，建立了汽车发动机排气物理化学性能参数计算模型。通过对燃油燃烧的化学过程分析，推导了发动机空燃比计算模型，可用于多种燃料燃烧的空燃比计算。 本文在汽车排气后处理装置工作过程研究方面，运用计算流体动力学软件，对催化转化装置气流场开展了模拟，得出了气体速度场和压力场的分布情况，提出了以改善气体流动和催化转化效率的催化转化装置结构优化的方案。建立了催化反应、载体内部的传质传热的数学模型。开发了催化转化装置工作过程有限元模拟软件。运用该软件，对催化转化装置的温升过程开展了数值模拟和试验研究。探讨了催化剂在载体内部的担载模式，提出了两种成本较低，但可大幅度改善催化装化装置温升过程中催化转化性能的催化剂担载模式。 本文的研究对汽车排放污染物控制有一定的学术价值和工程应用价值，为汽车排放污染物控制系统的设计和改进提供依据和方向。更多还原

【Abstract】 The technology of controlling vehicle emission is researched. Some deep studies, matching technology of engine for vehicle, emission performance of engine, working process of emission postprocessor, are investigated. It provides a technology basis of theoretic and testing research for the control of vehicle emission.In the fields of matching technology of engine for vehicle, the predicttive model based on vehicle running cycle of emission performance and economic feature is set up. It can deal with the match and optimization of vehicle, transmission and engine for the objective of improving the vehicle emission performance. The vehicle dynamics analysis software is developed. It can analyze the vehicle emission performance.During the research of emission performance for engine, calculating models for physics and chemical characteristic parameters of exhaust gas are set up. Especially, APR (Air Flew Ration) calculating model is derived based on the chemical analysis of burning process. It is suitable for all kind of fuels.Computer fluid dynamics (CFD) is adopted to simulate the flow fields of catalytic converter while researching the working process of emission postprocessor. The velocity field and pressure field of exhaust gas are obtained. Methods of structural optimization of catalytic converter for improving gas flow and conversion efficiency are proposed. Mathematical models of catalysis, heat and mass transfer in carrier are set up. The finite element software of simulating the working process of catalytic converter is developed. This, software can make the numerical simulation and testing research for catalyst converter during warm-up period. Loading patterns of catalyst in carrier are discussed. Two loading patterns, which cost are lower and can largely improve conversion characteristics of catalytic conyerter during warm-up period, are put forward.This thesis will be of great value of learning research and engineering apply in controlling vehicle emission. It can provide a basis and direction for the design and improvement of controlling system on vehicle emission.更多还原