汽车蓄电池触点的防氧化保护

车用蓄电池是汽车非常重要的组成部件之一,它是汽车电气系统的核心,是发动机启动必不可少的源动力。但在汽车日常保养中,汽车蓄电池往往被人们忽视,由于蓄电池故障导致的汽车抛锚现象不计其数,给人们日常行车带来很多不便。汽车蓄电池问题主要表现为充电不良、自行放电、蓄电池桩头与导线因氧化而短路甚至锈蚀断裂等。为了让车辆出行平安,我们应更多关注汽车蓄电池的日常养护。     

SAW焊接型剖面预报的模糊逻辑系统开发(英文)

A fuzzy model was presented to predict the weldment shape profile of submerged arc welds(SAW) including the shape of heat affected zone(HAZ).The SAW bead-on-plates were welded by following a full factorial design matrix.The design matrix consisted of three levels of input welding process parameters.The welds were cross-sectioned and etched,and the zones were measured.A mapping technique was used to measure the various segments of the weld zones.These mapped zones were used to build a fuzzy logic model.The membership functions of the fuzzy model were chosen for the accurate prediction of the weld zone.The fuzzy model was further tested for a set of test case data.The weld zone predicted by the fuzzy logic model was compared with the experimentally obtained shape profiles and close agreement between the two was noted.The mapping technique developed for the weld zones and the fuzzy logic model can be used for on-line control of the SAW process.From the SAW fuzzy logic model an estimation of the fusion and HAZ can also be developed.     

商用车全可变机械式冷却水泵

长期以来,改善效率和耐久性及降低噪声始终是开发冷却水泵的关注焦点。然而,近年来,对节能减排的要求不断提高,采用柔性装置已成为不可避免的课题。Pierburg泵工程公司推出了一种全可变冷却水泵方案,它借助于可调节的涡轮叶片使冷却液质量流量能适应发动机的需要。     

了解、优化和测试水在汽车外饰件涂层氙灯加速老化测试中的作用

目前测试涂层老化的最佳加速方法是SAEJ2527。该方法规定在氙灯箱内进行老化试验,经滤光片过滤后,氙灯光源产生与太阳光相似的光谱功率分布（SPD）;而且氙灯试验箱内的温度、湿度和在油漆样品上喷淋的液态水都能得到控制,希望能在短时间内模拟与佛罗里达户外曝晒相当的涂层失效状况。为了探究水在加速老化测试中的作用,保证水的类型（湿度或液态水）和水侵蚀时间必须与户外规定地点的水的类型和水侵蚀时间相一致,     

车用涡轮增压器的新一代

<正> 加勒特(Garrett)汽车产品公司研制了新的T2型涡轮增压器,供八十年代的车辆使用。 研究的目的是为了满足未来的汽车发展的需要,并达到了以下三个主要目标: 尺寸缩小; 价格下降; 性能提高。     

先进列队行驶技术的社会经济影响评价

以运行评价为基础应用BCA和DEA方法对先进列队行驶技术的社会经济影响进行评价.BCA仅考虑可用货币测度的输出指标旅行时间节省,DEA考虑车流平稳性的增加和旅行时间的节省两项指标,结果表明当列队行驶所占比例超过30%时,并且需求大于5500辆/小时,列队行驶系统能够获得很好的社会经济效果(BCR>1);当列队行驶所占比例不变时,需求水平越高DEA相对效率值越大;由于BCA方法忽略了某些用货币单位难以测度指标的影响,因此可能低估ITS项目的效益,DEA方法能克服这一不足,比BCA方法更有效.