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为了推进汽车轻量化,塑料零部件被广泛应用,其中注塑件的应用尤为突出。为了提高塑料制品的产品竞争力,了解汽车注塑件的生产工艺、注塑成型的要点、设备选择及成本构成是控制成本的有效方法、是推广应用的价值所在,是开展价值工程的源泉。生产与成本的有机结合、工艺与价值的相辅相成将为节能汽车的开发添砖加瓦。 相似文献
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新型柴油机电控系统喷射控制算法研究 总被引:7,自引:2,他引:7
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。 相似文献
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目的 探讨丹参注射液对梗阻性黄疸 (Obstructivejaundice ,OJ)大鼠肝组织中一氧化氮(NO)、丙二醛 (MDA)、内皮素 (ET)的影响及其意义。方法 采用双重结扎切断大鼠胆总管造成OJ模型 ,分别给大鼠腹腔注射生理盐水 (模型组 )和丹参注射液 (治疗组 ) ,各组于术后 7d和1 4d观察肝组织匀浆NO2 - +NO3- 、MDA、ET含量 ,肝功能及肝组织形态改变。结果 胆道梗阻 7d和 1 4d后大鼠肝组织中NO2 - +NO3- 、MDA含量较正常鼠明显增加 ,两者不随梗阻时间延长而升高 ;肝组织中ET含量亦明显增高 ,且随时间延长而增高。丹参治疗组大鼠肝组织中NO2 - +NO3- 与模型组无差异 ,而MDA和ET含量明显低于模型组 ,血浆ALT、AST明显降低 ,肝组织损伤减轻。结论 丹参注射液可降低OJ大鼠肝内MDA、ET含量 ,从而发挥肝脏保护作用 相似文献
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宋岩 《南通航运职业技术学院学报》2007,6(4):59-63
文章以南通淄柴船舶机械公司生产的Z6150ZLCZ-5型柴油机为对象,针对影响柴油机排放的各种因素,通过大量的试验研究,优化匹配了供油提前角、启喷压力。通过分析台架试验结果,总结了各参数对排放的影响,为船用柴油机满足排放标准拓宽思路,为该机型的进一步研发奠定基础。 相似文献
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The objective of the present study is the assessment of the environmental impact of a bivalent (bi-fuel) vehicle, running either on gasoline or compressed natural gas (CNG). To that aim, a Euro 6 passenger car was tested under various real-world driving conditions. In order to cover the full range of conventional powertrains currently in the market, the tests were also repeated on a Euro 6 diesel passenger car. Both cars were driven in two routes, the first complying with the regulation limits and the second going beyond them. Carbon monoxide (CO), nitrogen oxides (NOx) and particle number (PN) emissions were recorded using a Portable Emissions Measurement System (PEMS). Apart from the aggregated emission levels, in g/km, the exact emission location along the route was also assessed. Natural gas proved beneficial for CO and PN emissions, the level of which always remained below the respective legislation limits. On the other hand, under the dynamic driving conditions with gasoline, the relevant limits were exceeded. Cold start, occurring at the beginning of the urban part, and motorway driving were identified as major contributors to total emissions, especially in gasoline mode. However, the application of natural gas was associated with a penalty in NOx emissions, which were significantly increased as compared to gasoline. Local peaks within the urban part were identified in CNG mode. In any case, the diesel vehicle was by far the highest NOx emitter. 相似文献
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