船用柴油机的排放要求与相关标准介绍

随着科学技术的不断提高,人类对自身的生存环境也越来越关注,环保已日益成为政府和公众关注的焦点,在全世界空气污染严重的50个城市中,我国占了31个,其中污染最严重的10个城市中,我国占了5个。 1 我国排放法规体系 柴油汽车的滚滚黑烟及NO_X造成的城市大气污染已引起了各方的强烈反映。我国业已制定出适合我国国情的排放法规体系: 1)以欧洲汽车排放法规为蓝本,《汽车排放控制技术政策》明确:2000年采用Eure     

柴油机排放标准对润滑油发展的影响

阐明了柴油机润滑油的性能和质量对排放、节能的影响，分析了国内外柴油机润滑油的现状和发展趋势，提出了今后我国柴油油机润滑油的发展方向。     

工程机械用柴油机排放标准扫描

工程机械作为非道路移动机械的主要门类之一,由于使用条件特殊,在我国,对其污染物排放的监管一直处于松散状态。进入21世纪,随着工程机械产销量的连年增加,国家逐渐开始重视工程机械污染物的排放,并参照国际非道路移动机械排放控制标准,于2007年4月3日正式发布了我国首个非道路移动机械用柴油发动机排放标准。     

柴油机排放标准升级对我国曲轴市场的影响

国务院办公厅2013年2月6日下发《国务院办公厅关于加强内燃机工业节能减排的意见》,对乘用车用发动机、轻微型车用柴油机、中重型商用车用柴油机、非道路移动机械用柴油机、船用柴油机等的技术路线和升级重点给予明确规定,要求到2015年,节能型内燃机产品要占全社会内燃机产品保有量的60%。曲轴作为发动机关键的零件之一,在实现内燃机节能减     

满足未来排放法规的非道路用柴油机技术

长期以来国内非道路用柴油机出口到欧美等地区,都会受到当地排放法规的严重制约,2007年我国也制定了“非道路柴油机的排放限值及测量方法》标准。国内非道路用柴油机的排放要求将逐步与国际接轨。表I列出了相关排放标准对19～37kW柴油机的限值规定。     

LJ493柴油机满足欧Ⅱ排放标准的对策

通过对柴油机燃烧系统、喷油系统的改进，改善了柴油机排放，使配装493柴油机轻型载货汽车满足欧Ⅱ排放标准要求。     

混合动力车排放测量标准征求意见发布

环保部近日印发《轻型混合动力电动汽车污染物排放测量方法》（征求意见稿）,就混合动力汽车排放的相关测量标准征求意见。     

工程机械柴油机烟度排放问题的探讨

从工程机械柴油机使用性能和排放标准的要求出发 ,对烟度排放限值、测量方法以及测量仪器进行了分析和研究 ,探讨了解决工程机械柴油机烟度排放问题的一些基本思路     

柴油发动机烟度测量的不确定度分析

通过对柴油发动机烟度测量过程的分析,并对测量过程中不确定度来源进行分析,找出影响不确定度的主要原因,以提高在检验工作中的检测能力。     

Performance development target setting of passenger car diesel engine

Setting engine emission targets to meet diesel car requirements is particularly important in engine performance development phase. Many researches are focused on associating vehicle performance with engine targets, but most work is done by testing, which is time and cost consuming, furthermore, the relationship of vehicle and engine will change when either engine or vehicle changes. A GT-Drive model to simulate New European Driving Cycle (NEDC) for passenger car is developed and calibrated by testing data, model precision is controlled within 5%. Time distribution of engine operating conditions when car running NEDC cycle has been analyzed, 10 critical major engine operating points are summarized according to running time proportion. Emission of NOx and smoke control regions containing these 10 points for target engine are set. Vehicle emissions are simulated and evaluated during engine development after engine performance test data are got, and engine combustion system layout and calibration are adjusted until vehicle targets are met. Vehicle is tested in chassis dynamometer finally, the testing results show a good agreement with the simulated results with an error of less than 5%, which proves that the emission value exchange of vehicle and engine is reliable. Performance target decomposition method for passenger car diesel presented can greatly shorten the development cycle and save costs.     

复杂发动机关键机构的公差分析和优化

分析了公差对复杂发动机性能的影响,提出了针对复杂产品的公差分析和优化方法,综合考虑了各零件公差值大小、公差分布位置和零件误差积累对产品性能的影响,并根据公差分析结果和零件的加工成本等综合因素对零件公差进行优化。定义了具有公差信息的3维模型,开发了通用计算机辅助设计模型到公差模型的数据接口,给出了复杂产品公差分析和公差优化的一般步骤。最后,使用该方法对某型发动机曲柄连杆机构和活塞机构进行了公差分析和优化,并在实际产品开发中得到了验证。     

柴油机"飞车"与"游车"故障分析与诊断维修

以“飞车”与“游车”的形成机理为切入点，着重分析了柴油机“飞车”及“游车”的故障症状、原因，提出了对疑难故障的诊断检修方法。     

Soot characterisation and diesel engine wear

The hardness of various types of soot produced by heavy‐ and light‐duty diesel engines of European, Japanese, and North American designs was measured by low‐loss electron energy‐loss spectroscopy (EELS). No clear general trend can be established that shows heavy‐duty diesel engine soot is necessarily harder than light‐duty diesel engine soot. The variation in hardness among individual soot particles produced by the same diesel engine can be as large as differences between the hardest soot particles produced by heavy‐duty diesel engines and the softest soot particles produced by light‐duty diesel engines. There are heavy‐duty diesel engines that can produce soot that is softer than that produced by some light‐duty diesel engines and vice versa. Nevertheless, the hardness of all types of soot studied is close to the range of hardness of metal engine parts. Thus, the results indicate that soot is hard enough to abrade some metal engine parts.     

柴油机清洁度与可靠性问题浅析

笔者通过对柴油机检修、组装、试验过程中的清洁度分析,得出预防柴油机碾瓦事故的有效措施是提高柴油机在检修过程中的清洁度,这是确保柴油机检修质量必须加以控制的项目。     

Analysis of engine temperature and energy flow in diesel engine using engine thermal management

Recently, precise analysis of energy flow in engines has become necessary to improve fuel economy. An integrated engine thermal management model, which is introduced in this paper, is suitable for that process. The model consists of six sub-models for thermal mass, coolant, lubricant, heat transfer, friction, and exhaust. The sub-models are coupled to each other and they exchange heat and signals. Combustion energy flow analysis and temperature estimation of the engine components and working fluids were simulated under various conditions. Simulation results were compared with experimental data and they showed good agreement. Then, a variable-speed water pump (VSWP) to control coolant flow was applied in place of a conventional water pump. Engine warm-up time decreased with proper coolant flow control, and fuel economy could be improved by 2.5%.     

12V190型柴油机气门拆装机具的研制

介绍了一种气门拆装专用机具,采用螺旋手动结构,具有结构简单,操作安全快速等特点。     

康明斯柴油机气缸异常磨损原因分析及对策与检修

分析了重型车柴油机气缸磨损的规律和异常磨损的原因，从实践中总结了减磨措施与对策和诊断检修方法。     

2118Q型柴油机设计与研制

通过对2118Q型柴油机设计与研制过程中,得出2118Q柴油机设计与研制所要注意的技术关键和难题,为其它与之相类似的产品设计与研制提供有益的参考.