Carbonyl Emission Influenced by Combustion Process of Diesel Engine

The bench test of diesel engine is conducted fueled with biodiesel, diesel and blending fuel, the changes of cylinder pressure with crank angle is also measured, combined with the measurement results of carbonyl emissions, the theoretical relationship between combustion process and carbonyl formation is analyzed. The results show that, combustion intermediates such as C7, C5, CO and C2H2 are produced in the fuel oxidation process during the premixed combustion phase. The diffusion combustion period extend with the increase of load, and it is the main stage of re-oxidation and decomposition for the intermediate products, the cylinder temperature and pressure increase with the increase of load, while the ignition delay period is shortened, the probability of oxidation and conversion for carbonyl pollutants improve because of the extended residence time in the high-temperature and high pressure region, the high exhaust temperature in high load is conducive to the re-oxidation of carbonyl emissions.     

Influence numerical analysis of combustion chamber thermal boundary conditions on unsteady combustion characteristics in micro ICE

To research the influence of combustion chamber thermal boundary conditions on micro combustion characteristics in micro ICE, the laminar flow finite rate model is adopted to simulate the micro combustion process. Firstly, the influence of grid scale, the time step length and the maximum iterations per time step on accuracy of simulation results are explored. The results show that simulation results agree well with experimental results. And then, the influences of heat transfer coefficient, wall thickness and material on combustion characteristics are discussed. The results indicate that heat transfer coefficient has obvious influence on combustion characteristics. The pressure rise rate decreases, the ignition delays and the highest pressure value drops 2 atmospheres as heat transfer coefficient increases from 0 to 55 W/(m 2·K). The wall thickness and material have a little effect on combustion characteristics. This is because that the main heat transfer resistance in the heat flow path from cylinder to external environment lies between the outer wall and environment.     

A Structure of Intelligent Information Retrieval Agent

When users try to get Information over the Internet, Information overload has become a serious problem.So we propose to use intelligent information retrieval IIR agents as a solution to this problem.Based on the analysis of the features of retrieval system, including intelligent search, navigation guide, auto-notification, personal information management, dynamic personalized Web pages, and tools for page reading-aide, we discuss the responsibility of each component of intelligent information retrieval agent and how to organize these components to perform various functions to settle above problem, referring to the modularization structure of agent. Intelligent agent is doable and efficacious to increase the efficiency of information retrieval and to lighten network jam by preliminary practice.     

Speed Ratio Matching Strategies of Metal V-belt Type CVT System

The ratio control strategy and the relevant pulley clamping control strategy of the Metal Pushing V-belt Type CVT C Continuously Variable Transmission are key technology of CVT system matching. The engine output torque model and oil consumption model are given in numerical table by cubic spline interpolation to fit engine test result. Based on the engine speed feature, the speed ratio changing strategy of CVT in the numerical table are given to realize the optimal fuel economy and optimal performance mode within the ratio range of the CVT system.     

碱性空气介质对汽车发动机燃烧特性的影响研究

碱性空气介质参与缸内燃烧,是在汽车发动机的进气通道口使用超声波雾化装置,使其在碱性溶液中形成特定浓度的气溶胶,从而改变空气的基本摩尔比,并从进气阀进入发动机缸内参与燃烧。本论文以汽车发动机为研究对象,分析碱性介质在参与燃烧过程中,对发动机燃烧特性的影响,从而为提高发动机功率,降低燃油消耗率,并最终减少有害污染物在发动机排放过程中的排放量提供参考。     

自走式智能花叶类工业大麻收获装备用柴油机抱瓦的分析

自走式智能花叶类工业大麻收获装备所用柴油机（以下简称麻用柴油机）由于工作条件恶劣等原因,常常出现这样或那样的故障,其中抱瓦是麻用柴油机常见最严重的故障之一。本文从分析柴油机曲轴轴瓦的受力入手,通过柴油机润滑系统工作原理和抱瓦的故障现象,提出抱瓦的诊断思路,详细分析了产生抱瓦的具体原因,在此基础上给出了预防和减少抱瓦的有效措施。并创造性地提出了在麻用柴油机原润滑系统中加装一套机油提前润滑装置,从根本上避免抱瓦故障的发生。     

柴油机调速器的原理及故障检测

调速器是柴油机的重要组成部分.调速器故障是柴油机的典型疑难故障.为此,以VE型分配泵柴油机调速器为例,简要说明了VE调速器的组成及工作原理;同时,分析了柴油机几种常见故障与调速器的关系,对产生故障的原因进行了初步探讨,提出了一些排除调速器常见故障的方法.     

柴油机排气异常的故障分析及排除

柴油机排气异常是常见的故障,如不及时排除,将会影响柴油机的正常使用,同时也对大气造成严重污染。从使用和环保的角度分析了柴油机排气异常的原因及其排除方法。     

关于起动机适用于工程车的技术分析

起动机是工程车的关键零部件之一,起动机的性能好坏一定程度上决定了工程车的质量高低。介绍了目前工程车上常用起动机的现状,从技术角度提出了改进起动机性能的若干措施。     

农用柴油机喷油器雾化性能点火检测系统研究

喷油器对农用柴油机经济性有重要影响,为了提高农用柴油机经济性和动力性,设计了以AT89C52单片机为核心的农用柴油机喷油器雾化性能点火检测系统。该系统通过外夹式压力传感器检测高压油管内压力波的方法确定点火时刻,实现了喷油器雾化性能检测。同时,用Matlab/Simulink对该系统进行了仿真,结果表明,系统响应速度快、稳定,符合设计要求。