Lightweight mixture faults detection method for gasoline engine using on-line trend analysis

Mixture faults detection is meaningful for gasoline engines because proper mixture is the basic prerequisite for healthy running of a combustion engine. Among existing methods for faults detection, the data-driven trend analysis technique is widely used due to the simplicity and efficiency in time-domain. The CUSUM (Cumulative Sum Of Errors) algorithm is good at real-time trend extraction, but it’s easy to be costly on the fuel trim signal during the engine in normal working conditions, which will increase battery energy consumption because engine failure is rarely occurs. Hence, the conventional treatment methods of artifacts in the CUSUM algorithm are modified by means of decay function and detection time analysis. The thresholds are tuned according to the characteristics of artifacts instead of residual variability, which leads to better results of trend extraction and less computation. Then, the revised CUSUM algorithm is used for monitoring the mixture abnormal behaviors, and the mixture faults can be detected in real time through analyzing the variation features of fuel trim signal. The lightweight faults detector using the advanced CUSUM algorithm (FD-A-CUSUM) is evaluated on the experimental data collected from a Ford engine. The validation results show that while engine works under normal conditions, the computation of FD-A-CUSUM has decreased by 72.79 % in comparison with the detection method using the original CUSUM algorithm (FD-O-CUSUM), and the false alarm ratio of FD-A-CUSUM is 3.37 %. Futhermore, the detection results of FD-A-CUSUM for two leakage faults have achieved 91.18 % test accuracy.     

高填土U型桥台病害治理研究

结合内蒙古自治区乌海地区工程实际，就U型桥台高度与台身稳定性关系进行病害分析，并提出可行的加固方案及施工工艺。     

温度对离合器性能影响的研究

离合器作为整车传动系不可或缺的零部件,其使用故障多数为高温烧蚀,所以有必要深入了解温度与离合器性能之间的相互关系,找出影响离合器表面温度的因素和温度对离合器性能的影响,为整车离合器匹配设计提供支持。     

铁路货车超偏载检测装置确报匹配率低的问题分析

分析了哈尔滨铁路局铁路货车超偏载检测装置确报匹配率低的原因,提出了解决方案,阐述了解决问题过程和取得的效果。     

规范水运工程试验检测市场把好建设项目的内在质量关

结合日常对水运工程试验检测单位的监督检查,本文仅对试验单位的现状、存在的问题与对策等方面进行研讨.     

公交企业开展投入产出决策工作的探讨

随着我国社会主义市场经济的不断完善和深入发展。企业的资本运作力度在不断加大，为了提高企业的经营管理水平，应进一步完善投入产出决策体系。加强投入产出项目的决策工作，以促使企业产生更大的经济效益。本文结合城市公交企业经营管理的特点，就公交企业如何开展投人产出决策工作做一探讨。[第一段]     

浅谈船体三维立体建模

1 前言随着信息产业的飞速发展,计算机模拟造船已经成为时代的新宠,正由于它的准确,直观,信息丰富等优势,受到船东、船检、船厂的重视和使用,并且在这方面的要求也越来越高。国际上早已推出很多三维造船软件,如:西班牙的FORAN系统、瑞典的 Tribon Solution系统、美国的PTC CADDS5系统     

把握船员培训特点,提高教学质量

船员培训有别于全日制在校学生教育，主要阐述了如何针对其特点，帮助学员将生产和工作中的经验提高到理论高度，从而促进学员的学习兴趣，激发学员的学习积极性，提高其学习的效果，进而实现真正意义上的教学质量的提高。     

德国铁路客运营销特点及思考

德国铁路客运营销在竞争战略、站车服务、客票销售、换乘衔接、晚点赔偿等方面具有鲜明的特点,处处体现了以人为本的服务理念.针对我国铁路实际,从坚持提速战略、更新技术装备、统筹车站规划、提供人性化服务四个方面提出做好我国铁路客运营销的建议.     

论铁路运输企业人力资源的开发与管理

通过介绍国外企业人力资源开发和管理的经验,对照我国铁路运输企业人力资源开发和管理的现状,提出了当前我国铁路运输企业人力资源开发和管理的对策以及发展趋势.