CA4DC1柴油机配气机构设计

CA4DC1型柴油机是在CA498柴油机基础上开发的能够满足欧Ⅲ排放法规要求的柴油机.介绍了该柴油机在配气机构总体布置、气门组零件设计、气门传动机构设计、凸轮型线设计等方面所作的改进.     

天然气发动机最高转速准均质压燃特性的研究

就国产6110增压中冷发动机燃烧天然气的一些性能进行了研究。在压缩终了被少量柴油引燃的均匀天然气混合气的燃烧接近均质压燃燃烧过程。采用了发动机缸内分析以及相应工况的排放测试对比分析方式，对发动机的燃烧特性进行了试验研究。     

采用氧化型催化剂降低柴油机尾气排放的研究

建立了柴油机氧化型催化剂的微型评价装置,采用微型评价装置和发动机台架试验对柴油机的氧化型催化剂的方案进行筛选,通过台架13工况法和底盘测功机检测,结果表明,采用氧化型催化剂对降低柴油机尾气排放十分有效。     

接触氧化设备处理小水量生活污水的动力学分析

介绍了采用一种全新织物填料的接触氧化设备处理小水量生活污水的工艺流程及原理,在分析归纳试验数据的基础上,确定了在试验条件下该设备处理小水量生活污水的COD降解动力学模型参数,为放大设计提供参考。     

柴油机颗粒物排放后处理技术

柴油机已在全球范围得到广泛应用，柴油机排放的颗粒物（PM）对环境具有十分恶劣的影响，降低其颗粒物排放是目前的研究热点。文章介绍了车辆排气中颗粒物的组成和生成机理，阐述了目前正在应用及研究的6种颗粒物排放后处理技术。指出我国硫含量过高限制了许多种类的颗粒物排放后处理技术的运用，因此我国应采用各种可靠性较高的主动再生柴油机颗粒捕集器。     

Bacterial production and microbial food web structure in a large arctic river and the coastal Arctic Ocean

Globally significant quantities of organic carbon are stored in northern permafrost soils, but little is known about how this carbon is processed by microbial communities once it enters rivers and is transported to the coastal Arctic Ocean. As part of the Arctic River-Delta Experiment (ARDEX), we measured environmental and microbiological variables along a 300 km transect in the Mackenzie River and coastal Beaufort Sea, in July–August 2004. Surface bacterial concentrations averaged 6.7 × 10⁵ cells mL^− 1 with no significant differences between sampling zones. Picocyanobacteria were abundant in the river, and mostly observed as cell colonies. Their concentrations in the surface waters decreased across the salinity gradient, dropping from 51,000 (river) to 30 (sea) cells mL^− 1. There were accompanying shifts in protist community structure, from diatoms, cryptophytes, heterotrophic protists and chrysophytes in the river, to dinoflagellates, prymnesiophytes, chrysophytes, prasinophytes, diatoms and heterotrophic protists in the Beaufort Sea.Size-fractionated bacterial production, as measured by ³H–leucine uptake, varied from 76 to 416 ng C L^− 1 h^− 1. The contribution of particle-attached bacteria (> 3 µm fraction) to total bacterial production decreased from > 90% at the Mackenzie River stations to < 20% at an offshore marine site, and the relative importance of this particle-based fraction was inversely correlated with salinity and positively correlated with particulate organic carbon concentrations. Glucose enrichment experiments indicated that bacterial metabolism was carbon limited in the Mackenzie River but not in the coastal ocean. Prior exposure of water samples to full sunlight increased the biolability of dissolved organic carbon (DOC) in the Mackenzie River but decreased it in the Beaufort Sea.Estimated depth-integrated bacterial respiration rates in the Mackenzie River were higher than depth-integrated primary production rates, while at the marine stations bacterial respiration rates were near or below the integrated primary production rates. Consistent with these results, P_CO2 measurements showed surface water supersaturation in the river (mean of 146% of air equilibrium values) and subsaturation or near-saturation in the coastal sea. These results show a well-developed microbial food web in the Mackenzie River system that will likely convert tundra carbon to atmospheric CO₂ at increasing rates as the arctic climate continues to warm.     

涡轮增压系统在多缸发动机中的应用

本文分析了几种常见的增压系统的特点,提出了ＭＩＸＰＣ系统,并阐述了该系统的原理,结构和。对５缸,７缸,８缸、９缸和１０缸柴油机进行了模拟计算,结果表明,ＭＩＸＰＣ系统的经济性,扫气系数以及各缸扫气均匀性都优于ＭＰＣ系统,是一种崭新的很有前任的涡轮增压系统。     

大型集装箱船主柴油机控制实时仿真系统

利用动态优化ＢＰ神经网络,面向对象技术、ＧＦＷ工控软件平台和多媒体技术开发了一个船用柴油机控制实时仿真系统。该系统实现了２７００箱集装船船“高河”轮Ｓ０７／９０遥控系统Ｓ０６安全保护系统,ＤＧＵ８８００电子调速系统和Ｂ＆Ｗ６Ｌ８０ＭＣ柴油机的动态仿真。该系统有两种操作方式,一种通过模拟机 控台和驾驶室控台的控制面板和车钟等进行操作另一种是通过触摸屏对控制系统的软界面进行操作。     

车用柴油机变工况下排气微粒的测量

研制了一种在发动机台架上进行柴油机变工况下排气微粒测量的测试系统。该系统主要由普通测功机和微粒稀释取样袋等组成。用此系统可进行柴油机恒转速扭矩、恒扭矩变转速和转速与扭矩成比例变化等模式变工况的微粒测量。试验结果表明柴油机在不同变工况模式下的微粒和有各自不同的变化规律。     

新型柴油机电控系统喷射控制算法研究

在一种新型柴油机电控制油射系统中，高压喷射过程是基于角度的过程，而以单片机为核心的电磁阀控制是一个基于时间的过程，为了实现精确的喷射过程控制，必须利用油泵凸轮轴瞬时转速完成时间和角度转换。