An investigation of the performance of an electronic in-line pump system for diesel engines

WIT Electronic Fuel System Co., Ltd. has developed a new fuel injector, the Electronic In-line Pump （EIP） system, designed to meet China＇s diesel engine emission and fuel economy regulations. It can be used on marine diesel engines and commercial vehicle engines through different EIP systems. A numerical model of the EIP system was built in the AMESim environment for the purpose of creating a design tool for engine application and system optimization. The model was used to predict key injection characteristics under different operating conditions, such as injection pressure, injection rate, and injection duration. To validate these predictions, experimental tests were conducted under the conditions that were modeled. The results were quite encouraging and in agreement with model predictions. Additional experiments were conducted to study the injection characteristics of the EIP system. These results show that injection pressure and injection quantity are insensitive to injection timing variations, this is due to the design of the constant velocity cam profile. Finally, injection quantity and pressure vs. pulse width at different cam speeds are presented, an important injection characteristic for EIP system calibration.     

《船上油污应急计划》编制及其应用中问题的探讨

船上船污应急计划的编制和实施，对减轻海洋环境污染起了积极作用，尽管目前大量船舶都编制了该计划，经调查发现许多船舶在应用中还存在不少问题，为进一步提高各类船舶对所发生的油污应急反应能力，必须加强演练，定期评估、检查和修改已制定的计划。     

广州地铁三号线车辆空压机油乳化原因分析及对策

广州地铁三号线车辆由于列车的编组形式、系统性能等多方面的原因,空压机润滑油乳化现象极其严重。文章通过对空压机油乳化的原因分析,找出了一种有效的解决措施,并对如何避免乳化现象提出了建议。     

SEW行走三位一体减速机输出轴油封改造

分析了门座式起重机行走机所采用的SEW减速箱漏油现象，介绍了技术改造的方案，取得了较好的效果。     

缸内直喷的丰田卡罗拉1.2T怠速不稳解析

一辆2020款丰田卡罗拉1.2T汽车,行驶里程为1000KM,出现怠速不稳甚至熄火,经过专用诊断仪测试,汽车的高压燃油压力最高为16MPA,小于正常的20PMA,而且高压压力值随着怠速时间延长逐渐下降,甚至达到0.2MPA,启动时不容易着车,反复启动着车正常,高压压力无规律波动,更换高压油泵故障仍出现,高压油泵属于日本两个汽车配件厂生产,此故障曾在同类车型出现,丰田制造厂已经启动调研程序。     

Combustion development of a Bi-Fuel engine

Environmental improvement and energy issues are increasingly becoming more important as worldwide concerns. Natural gas is a good alternative fuel that can help to improve these issues because of its large quantity and clean burning characteristics. This paper provides the experimental performance results of a Bi-Fuel engine that uses Compressed Natural Gas as its Primary fuel and gasoline as its secondary fuel. This engine is a modification of the basic 1.4-liter gasoline engine. Generally, on the unmodified base engine, torque and power for CNG fuel are considerably lower than gasoline fuel. In this paper, the influence of fuels on wall temperature, performance and emissions are investigated.     

基于共同结构规范的油船结构分析方法

以VLCC为例，着重阐述了中国船级社（CCS）自主研发的结构分析软件CCS—Tools在共同结构规范（CSR）油船设计审图中的应用。IACSJTP油船结构设计程序是CCS最新研究成果，它将使人们从繁冗的CSR评估工作中解脱出来，从而通过先进完善的计算手段完成油船的设计和校核工作。     

枪钻技术在汽车半轴加工中的应用

针对枪钻专机的结构、性能特点及枪钻头的结构、工作原理、主要参数进行了详细地介绍;分析和总结了加工中所遇到的各种问题及其解决方法；对于枪钻技术应用于汽车半轴深孔加工的工艺进行了有益地改进；并给出了一些重要的参数。     

电动燃油泵换向器磨损原因分析和解决方案

由于乙醇汽油的应用，电动燃油泵的铜换向器磨损加速，严重影响了该产品的寿命，本文对磨损加速的原因进行分析，并提出解决方案。     

机油清洁度铁谱分析检测方法研究

提出了便于在国内推广应用的机油清洁度铁谱分析检测方法。介绍了谱片的制作与污染颗粒的检测和统计方法，给出了污染颗粒等效直径的计算公式，为实现机械设备运用机油清洁度质量管理提供了有用的工具。